Merge branch 'master' into for-next

50 files changed, 7476 insertions, 442 deletions

diff --git a/drivers/media/common/ir-keymaps.c b/drivers/media/common/ir-keymaps.c
index a3485817e46..8fa91f846d5 100644
--- a/drivers/media/common/ir-keymaps.c
+++ b/drivers/media/common/ir-keymaps.c
@@ -2201,3 +2201,41 @@ IR_KEYTAB_TYPE ir_codes_powercolor_real_angel[IR_KEYTAB_SIZE] = {
 	[0x25] = KEY_POWER,		/* power */
 };
 EXPORT_SYMBOL_GPL(ir_codes_powercolor_real_angel);
+
+IR_KEYTAB_TYPE ir_codes_avermedia_a16d[IR_KEYTAB_SIZE] = {
+	[0x20] = KEY_LIST,
+	[0x00] = KEY_POWER,
+	[0x28] = KEY_1,
+	[0x18] = KEY_2,
+	[0x38] = KEY_3,
+	[0x24] = KEY_4,
+	[0x14] = KEY_5,
+	[0x34] = KEY_6,
+	[0x2c] = KEY_7,
+	[0x1c] = KEY_8,
+	[0x3c] = KEY_9,
+	[0x12] = KEY_SUBTITLE,
+	[0x22] = KEY_0,
+	[0x32] = KEY_REWIND,
+	[0x3a] = KEY_SHUFFLE,
+	[0x02] = KEY_PRINT,
+	[0x11] = KEY_CHANNELDOWN,
+	[0x31] = KEY_CHANNELUP,
+	[0x0c] = KEY_ZOOM,
+	[0x1e] = KEY_VOLUMEDOWN,
+	[0x3e] = KEY_VOLUMEUP,
+	[0x0a] = KEY_MUTE,
+	[0x04] = KEY_AUDIO,
+	[0x26] = KEY_RECORD,
+	[0x06] = KEY_PLAY,
+	[0x36] = KEY_STOP,
+	[0x16] = KEY_PAUSE,
+	[0x2e] = KEY_REWIND,
+	[0x0e] = KEY_FASTFORWARD,
+	[0x30] = KEY_TEXT,
+	[0x21] = KEY_GREEN,
+	[0x01] = KEY_BLUE,
+	[0x08] = KEY_EPG,
+	[0x2a] = KEY_MENU,
+};
+EXPORT_SYMBOL_GPL(ir_codes_avermedia_a16d);
diff --git a/drivers/media/common/tuners/tda18271-common.c b/drivers/media/common/tuners/tda18271-common.c
index f1894fec32b..6fb5b458656 100644
--- a/drivers/media/common/tuners/tda18271-common.c
+++ b/drivers/media/common/tuners/tda18271-common.c
@@ -649,9 +649,17 @@ int tda18271_calc_rf_cal(struct dvb_frontend *fe, u32 *freq)
 	u8 val;
 
 	int ret = tda18271_lookup_map(fe, RF_CAL, freq, &val);
+	/* The TDA18271HD/C1 rf_cal map lookup is expected to go out of range
+	 * for frequencies above 61.1 MHz.  In these cases, the internal RF
+	 * tracking filters calibration mechanism is used.
+	 *
+	 * There is no need to warn the user about this.
+	 */
+	if (ret < 0)
+		goto fail;
 
 	regs[R_EB14] = val;
-
+fail:
 	return ret;
 }
 
diff --git a/drivers/media/common/tuners/tda18271-fe.c b/drivers/media/common/tuners/tda18271-fe.c
index 89c01fb1f85..93063c6fbbf 100644
--- a/drivers/media/common/tuners/tda18271-fe.c
+++ b/drivers/media/common/tuners/tda18271-fe.c
@@ -45,6 +45,21 @@ static inline int charge_pump_source(struct dvb_frontend *fe, int force)
 					   TDA18271_MAIN_PLL, force);
 }
 
+static inline void tda18271_set_if_notch(struct dvb_frontend *fe)
+{
+	struct tda18271_priv *priv = fe->tuner_priv;
+	unsigned char *regs = priv->tda18271_regs;
+
+	switch (priv->mode) {
+	case TDA18271_ANALOG:
+		regs[R_MPD]  &= ~0x80; /* IF notch = 0 */
+		break;
+	case TDA18271_DIGITAL:
+		regs[R_MPD]  |= 0x80; /* IF notch = 1 */
+		break;
+	}
+}
+
 static int tda18271_channel_configuration(struct dvb_frontend *fe,
 					  struct tda18271_std_map_item *map,
 					  u32 freq, u32 bw)
@@ -60,25 +75,18 @@ static int tda18271_channel_configuration(struct dvb_frontend *fe,
 	regs[R_EP3]  &= ~0x1f; /* clear std bits */
 	regs[R_EP3]  |= (map->agc_mode << 3) | map->std;
 
-	/* set rfagc to high speed mode */
-	regs[R_EP3] &= ~0x04;
+	if (priv->id == TDA18271HDC2) {
+		/* set rfagc to high speed mode */
+		regs[R_EP3] &= ~0x04;
+	}
 
 	/* set cal mode to normal */
 	regs[R_EP4]  &= ~0x03;
 
-	/* update IF output level & IF notch frequency */
+	/* update IF output level */
 	regs[R_EP4]  &= ~0x1c; /* clear if level bits */
 	regs[R_EP4]  |= (map->if_lvl << 2);
 
-	switch (priv->mode) {
-	case TDA18271_ANALOG:
-		regs[R_MPD]  &= ~0x80; /* IF notch = 0 */
-		break;
-	case TDA18271_DIGITAL:
-		regs[R_MPD]  |= 0x80; /* IF notch = 1 */
-		break;
-	}
-
 	/* update FM_RFn */
 	regs[R_EP4]  &= ~0x80;
 	regs[R_EP4]  |= map->fm_rfn << 7;
@@ -95,6 +103,9 @@ static int tda18271_channel_configuration(struct dvb_frontend *fe,
 	/* disable Power Level Indicator */
 	regs[R_EP1]  |= 0x40;
 
+	/* make sure thermometer is off */
+	regs[R_TM]   &= ~0x10;
+
 	/* frequency dependent parameters */
 
 	tda18271_calc_ir_measure(fe, &freq);
@@ -135,6 +146,7 @@ static int tda18271_channel_configuration(struct dvb_frontend *fe,
 	switch (priv->role) {
 	case TDA18271_MASTER:
 		tda18271_calc_main_pll(fe, N);
+		tda18271_set_if_notch(fe);
 		tda18271_write_regs(fe, R_MPD, 4);
 		break;
 	case TDA18271_SLAVE:
@@ -142,6 +154,7 @@ static int tda18271_channel_configuration(struct dvb_frontend *fe,
 		tda18271_write_regs(fe, R_CPD, 4);
 
 		regs[R_MPD] = regs[R_CPD] & 0x7f;
+		tda18271_set_if_notch(fe);
 		tda18271_write_regs(fe, R_MPD, 1);
 		break;
 	}
@@ -160,12 +173,14 @@ static int tda18271_channel_configuration(struct dvb_frontend *fe,
 
 	msleep(20);
 
-	/* set rfagc to normal speed mode */
-	if (map->fm_rfn)
-		regs[R_EP3] &= ~0x04;
-	else
-		regs[R_EP3] |= 0x04;
-	ret = tda18271_write_regs(fe, R_EP3, 1);
+	if (priv->id == TDA18271HDC2) {
+		/* set rfagc to normal speed mode */
+		if (map->fm_rfn)
+			regs[R_EP3] &= ~0x04;
+		else
+			regs[R_EP3] |= 0x04;
+		ret = tda18271_write_regs(fe, R_EP3, 1);
+	}
 fail:
 	return ret;
 }
@@ -507,7 +522,7 @@ static int tda18271_powerscan_init(struct dvb_frontend *fe)
 	/* set cal mode to normal */
 	regs[R_EP4]  &= ~0x03;
 
-	/* update IF output level & IF notch frequency */
+	/* update IF output level */
 	regs[R_EP4]  &= ~0x1c; /* clear if level bits */
 
 	ret = tda18271_write_regs(fe, R_EP3, 2);
diff --git a/drivers/media/common/tuners/xc5000.c b/drivers/media/common/tuners/xc5000.c
index ceae6db901e..7cf4f5bdb2e 100644
--- a/drivers/media/common/tuners/xc5000.c
+++ b/drivers/media/common/tuners/xc5000.c
@@ -177,6 +177,7 @@ static XC_TV_STANDARD XC5000_Standard[MAX_TV_STANDARD] = {
 	{"FM Radio-INPUT1",   0x0208, 0x9002}
 };
 
+static int  xc5000_is_firmware_loaded(struct dvb_frontend *fe);
 static int  xc5000_writeregs(struct xc5000_priv *priv, u8 *buf, u8 len);
 static int  xc5000_readregs(struct xc5000_priv *priv, u8 *buf, u8 len);
 static void xc5000_TunerReset(struct dvb_frontend *fe);
@@ -352,7 +353,7 @@ static int xc_SetTVStandard(struct xc5000_priv *priv,
 
 static int xc_shutdown(struct xc5000_priv *priv)
 {
-	return 0;
+	return XC_RESULT_SUCCESS;
 	/* Fixme: cannot bring tuner back alive once shutdown
 	 *        without reloading the driver modules.
 	 *    return xc_write_reg(priv, XREG_POWER_DOWN, 0);
@@ -685,6 +686,25 @@ static int xc5000_set_params(struct dvb_frontend *fe,
 	return 0;
 }
 
+static int xc5000_is_firmware_loaded(struct dvb_frontend *fe)
+{
+	struct xc5000_priv *priv = fe->tuner_priv;
+	int ret;
+	u16 id;
+
+	ret = xc5000_readreg(priv, XREG_PRODUCT_ID, &id);
+	if (ret == XC_RESULT_SUCCESS) {
+		if (id == XC_PRODUCT_ID_FW_NOT_LOADED)
+			ret = XC_RESULT_RESET_FAILURE;
+		else
+			ret = XC_RESULT_SUCCESS;
+	}
+
+	dprintk(1, "%s() returns %s id = 0x%x\n", __func__,
+		ret == XC_RESULT_SUCCESS ? "True" : "False", id);
+	return ret;
+}
+
 static int xc_load_fw_and_init_tuner(struct dvb_frontend *fe);
 
 static int xc5000_set_analog_params(struct dvb_frontend *fe,
@@ -693,7 +713,7 @@ static int xc5000_set_analog_params(struct dvb_frontend *fe,
 	struct xc5000_priv *priv = fe->tuner_priv;
 	int ret;
 
-	if(priv->fwloaded == 0)
+	if (xc5000_is_firmware_loaded(fe) != XC_RESULT_SUCCESS)
 		xc_load_fw_and_init_tuner(fe);
 
 	dprintk(1, "%s() frequency=%d (in units of 62.5khz)\n",
@@ -808,11 +828,10 @@ static int xc_load_fw_and_init_tuner(struct dvb_frontend *fe)
 	struct xc5000_priv *priv = fe->tuner_priv;
 	int ret = 0;
 
-	if (priv->fwloaded == 0) {
+	if (xc5000_is_firmware_loaded(fe) != XC_RESULT_SUCCESS) {
 		ret = xc5000_fwupload(fe);
 		if (ret != XC_RESULT_SUCCESS)
 			return ret;
-		priv->fwloaded = 1;
 	}
 
 	/* Start the tuner self-calibration process */
@@ -852,7 +871,6 @@ static int xc5000_sleep(struct dvb_frontend *fe)
 		return -EREMOTEIO;
 	}
 	else {
-		/* priv->fwloaded = 0; */
 		return XC_RESULT_SUCCESS;
 	}
 }
@@ -933,7 +951,6 @@ struct dvb_frontend *xc5000_attach(struct dvb_frontend *fe,
 			cfg->i2c_address);
 		printk(KERN_INFO
 			"xc5000: Firmware has been loaded previously\n");
-		priv->fwloaded = 1;
 		break;
 	case XC_PRODUCT_ID_FW_NOT_LOADED:
 		printk(KERN_INFO
@@ -941,7 +958,6 @@ struct dvb_frontend *xc5000_attach(struct dvb_frontend *fe,
 			cfg->i2c_address);
 		printk(KERN_INFO
 			"xc5000: Firmware has not been loaded previously\n");
-		priv->fwloaded = 0;
 		break;
 	default:
 		printk(KERN_ERR
diff --git a/drivers/media/common/tuners/xc5000_priv.h b/drivers/media/common/tuners/xc5000_priv.h
index ecebfe4745a..a72a9887fe7 100644
--- a/drivers/media/common/tuners/xc5000_priv.h
+++ b/drivers/media/common/tuners/xc5000_priv.h
@@ -30,7 +30,6 @@ struct xc5000_priv {
 	u32 bandwidth;
 	u8  video_standard;
 	u8  rf_mode;
-	u8  fwloaded;
 
 	void *devptr;
 };
diff --git a/drivers/media/dvb/dvb-usb/gl861.c b/drivers/media/dvb/dvb-usb/gl861.c
index 0a8ac64a4e3..037f7ffb47b 100644
--- a/drivers/media/dvb/dvb-usb/gl861.c
+++ b/drivers/media/dvb/dvb-usb/gl861.c
@@ -47,6 +47,8 @@ static int gl861_i2c_msg(struct dvb_usb_device *d, u8 addr,
 		return -EINVAL;
 	}
 
+	msleep(1); /* avoid I2C errors */
+
 	return usb_control_msg(d->udev, usb_rcvctrlpipe(d->udev, 0), req, type,
 			       value, index, rbuf, rlen, 2000);
 }
@@ -92,16 +94,6 @@ static struct i2c_algorithm gl861_i2c_algo = {
 };
 
 /* Callbacks for DVB USB */
-static int gl861_identify_state(struct usb_device *udev,
-				struct dvb_usb_device_properties *props,
-				struct dvb_usb_device_description **desc,
-				int *cold)
-{
-	*cold = 0;
-
-	return 0;
-}
-
 static struct zl10353_config gl861_zl10353_config = {
 	.demod_address = 0x0f,
 	.no_tuner = 1,
@@ -172,7 +164,6 @@ static struct dvb_usb_device_properties gl861_properties = {
 
 	.size_of_priv     = 0,
 
-	.identify_state   = gl861_identify_state,
 	.num_adapters = 1,
 	.adapter = {{
 
@@ -194,13 +185,15 @@ static struct dvb_usb_device_properties gl861_properties = {
 
 	.num_device_descs = 2,
 	.devices = {
-		{   "MSI Mega Sky 55801 DVB-T USB2.0",
-			{ &gl861_table[0], NULL },
-			{ NULL },
+		{
+			.name = "MSI Mega Sky 55801 DVB-T USB2.0",
+			.cold_ids = { NULL },
+			.warm_ids = { &gl861_table[0], NULL },
 		},
-		{   "A-LINK DTU DVB-T USB2.0",
-			{ &gl861_table[1], NULL },
-			{ NULL },
+		{
+			.name = "A-LINK DTU DVB-T USB2.0",
+			.cold_ids = { NULL },
+			.warm_ids = { &gl861_table[1], NULL },
 		},
 	}
 };
diff --git a/drivers/media/dvb/dvb-usb/umt-010.c b/drivers/media/dvb/dvb-usb/umt-010.c
index 9e7653bb3b6..118aab1a3e5 100644
--- a/drivers/media/dvb/dvb-usb/umt-010.c
+++ b/drivers/media/dvb/dvb-usb/umt-010.c
@@ -107,7 +107,7 @@ static struct dvb_usb_device_properties umt_properties = {
 			/* parameter for the MPEG2-data transfer */
 			.stream = {
 				.type = USB_BULK,
-				.count = 20,
+				.count = MAX_NO_URBS_FOR_DATA_STREAM,
 				.endpoint = 0x06,
 				.u = {
 					.bulk = {
diff --git a/drivers/media/dvb/frontends/au8522.c b/drivers/media/dvb/frontends/au8522.c
index 084a280c2d7..03900d241a7 100644
--- a/drivers/media/dvb/frontends/au8522.c
+++ b/drivers/media/dvb/frontends/au8522.c
@@ -463,10 +463,13 @@ static int au8522_set_frontend(struct dvb_frontend *fe,
 			       struct dvb_frontend_parameters *p)
 {
 	struct au8522_state *state = fe->demodulator_priv;
+	int ret = -EINVAL;
 
 	dprintk("%s(frequency=%d)\n", __func__, p->frequency);
 
-	state->current_frequency = p->frequency;
+	if ((state->current_frequency == p->frequency) &&
+	    (state->current_modulation == p->u.vsb.modulation))
+		return 0;
 
 	au8522_enable_modulation(fe, p->u.vsb.modulation);
 
@@ -476,11 +479,16 @@ static int au8522_set_frontend(struct dvb_frontend *fe,
 	if (fe->ops.tuner_ops.set_params) {
 		if (fe->ops.i2c_gate_ctrl)
 			fe->ops.i2c_gate_ctrl(fe, 1);
-		fe->ops.tuner_ops.set_params(fe, p);
+		ret = fe->ops.tuner_ops.set_params(fe, p);
 		if (fe->ops.i2c_gate_ctrl)
 			fe->ops.i2c_gate_ctrl(fe, 0);
 	}
 
+	if (ret < 0)
+		return ret;
+
+	state->current_frequency = p->frequency;
+
 	return 0;
 }
 
@@ -498,6 +506,16 @@ static int au8522_init(struct dvb_frontend *fe)
 	return 0;
 }
 
+static int au8522_sleep(struct dvb_frontend *fe)
+{
+	struct au8522_state *state = fe->demodulator_priv;
+	dprintk("%s()\n", __func__);
+
+	state->current_frequency = 0;
+
+	return 0;
+}
+
 static int au8522_read_status(struct dvb_frontend *fe, fe_status_t *status)
 {
 	struct au8522_state *state = fe->demodulator_priv;
@@ -509,10 +527,8 @@ static int au8522_read_status(struct dvb_frontend *fe, fe_status_t *status)
 	if (state->current_modulation == VSB_8) {
 		dprintk("%s() Checking VSB_8\n", __func__);
 		reg = au8522_readreg(state, 0x4088);
-		if (reg & 0x01)
-			*status |= FE_HAS_VITERBI;
-		if (reg & 0x02)
-			*status |= FE_HAS_LOCK | FE_HAS_SYNC;
+		if ((reg & 0x03) == 0x03)
+			*status |= FE_HAS_LOCK | FE_HAS_SYNC | FE_HAS_VITERBI;
 	} else {
 		dprintk("%s() Checking QAM\n", __func__);
 		reg = au8522_readreg(state, 0x4541);
@@ -672,6 +688,7 @@ static struct dvb_frontend_ops au8522_ops = {
 	},
 
 	.init                 = au8522_init,
+	.sleep                = au8522_sleep,
 	.i2c_gate_ctrl        = au8522_i2c_gate_ctrl,
 	.set_frontend         = au8522_set_frontend,
 	.get_frontend         = au8522_get_frontend,
diff --git a/drivers/media/dvb/frontends/stv0299.c b/drivers/media/dvb/frontends/stv0299.c
index 17556183e87..35435bef8e7 100644
--- a/drivers/media/dvb/frontends/stv0299.c
+++ b/drivers/media/dvb/frontends/stv0299.c
@@ -63,6 +63,7 @@ struct stv0299_state {
 	u32 symbol_rate;
 	fe_code_rate_t fec_inner;
 	int errmode;
+	u32 ucblocks;
 };
 
 #define STATUS_BER 0
@@ -501,8 +502,10 @@ static int stv0299_read_ber(struct dvb_frontend* fe, u32* ber)
 {
 	struct stv0299_state* state = fe->demodulator_priv;
 
-	if (state->errmode != STATUS_BER) return 0;
-	*ber = (stv0299_readreg (state, 0x1d) << 8) | stv0299_readreg (state, 0x1e);
+	if (state->errmode != STATUS_BER)
+		return -ENOSYS;
+
+	*ber = stv0299_readreg(state, 0x1e) | (stv0299_readreg(state, 0x1d) << 8);
 
 	return 0;
 }
@@ -540,8 +543,12 @@ static int stv0299_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
 {
 	struct stv0299_state* state = fe->demodulator_priv;
 
-	if (state->errmode != STATUS_UCBLOCKS) *ucblocks = 0;
-	else *ucblocks = (stv0299_readreg (state, 0x1d) << 8) | stv0299_readreg (state, 0x1e);
+	if (state->errmode != STATUS_UCBLOCKS)
+		return -ENOSYS;
+
+	state->ucblocks += stv0299_readreg(state, 0x1e);
+	state->ucblocks += (stv0299_readreg(state, 0x1d) << 8);
+	*ucblocks = state->ucblocks;
 
 	return 0;
 }
diff --git a/drivers/media/dvb/frontends/tda10023.c b/drivers/media/dvb/frontends/tda10023.c
index 0727b80bc4d..c6ff5b82ff8 100644
--- a/drivers/media/dvb/frontends/tda10023.c
+++ b/drivers/media/dvb/frontends/tda10023.c
@@ -116,9 +116,12 @@ static u8 tda10023_readreg (struct tda10023_state* state, u8 reg)
 	int ret;
 
 	ret = i2c_transfer (state->i2c, msg, 2);
-	if (ret != 2)
-		printk("DVB: TDA10023: %s: readreg error (ret == %i)\n",
-				 __func__, ret);
+	if (ret != 2) {
+		int num = state->frontend.dvb ? state->frontend.dvb->num : -1;
+		printk(KERN_ERR "DVB: TDA10023(%d): %s: readreg error "
+			"(reg == 0x%02x, ret == %i)\n",
+			num, __func__, reg, ret);
+	}
 	return b1[0];
 }
 
@@ -129,11 +132,12 @@ static int tda10023_writereg (struct tda10023_state* state, u8 reg, u8 data)
 	int ret;
 
 	ret = i2c_transfer (state->i2c, &msg, 1);
-	if (ret != 1)
-		printk("DVB: TDA10023(%d): %s, writereg error "
+	if (ret != 1) {
+		int num = state->frontend.dvb ? state->frontend.dvb->num : -1;
+		printk(KERN_ERR "DVB: TDA10023(%d): %s, writereg error "
 			"(reg == 0x%02x, val == 0x%02x, ret == %i)\n",
-			state->frontend.dvb->num, __func__, reg, data, ret);
-
+			num, __func__, reg, data, ret);
+	}
 	return (ret != 1) ? -EREMOTEIO : 0;
 }
 
@@ -464,7 +468,7 @@ struct dvb_frontend* tda10023_attach(const struct tda1002x_config* config,
 	int i;
 
 	/* allocate memory for the internal state */
-	state = kmalloc(sizeof(struct tda10023_state), GFP_KERNEL);
+	state = kzalloc(sizeof(struct tda10023_state), GFP_KERNEL);
 	if (state == NULL) goto error;
 
 	/* setup the state */
diff --git a/drivers/media/dvb/frontends/tda1004x.c b/drivers/media/dvb/frontends/tda1004x.c
index 49973846373..a0d63865356 100644
--- a/drivers/media/dvb/frontends/tda1004x.c
+++ b/drivers/media/dvb/frontends/tda1004x.c
@@ -1248,11 +1248,14 @@ struct dvb_frontend* tda10045_attach(const struct tda1004x_config* config,
 				     struct i2c_adapter* i2c)
 {
 	struct tda1004x_state *state;
+	int id;
 
 	/* allocate memory for the internal state */
 	state = kmalloc(sizeof(struct tda1004x_state), GFP_KERNEL);
-	if (!state)
+	if (!state) {
+		printk(KERN_ERR "Can't alocate memory for tda10045 state\n");
 		return NULL;
+	}
 
 	/* setup the state */
 	state->config = config;
@@ -1260,7 +1263,15 @@ struct dvb_frontend* tda10045_attach(const struct tda1004x_config* config,
 	state->demod_type = TDA1004X_DEMOD_TDA10045;
 
 	/* check if the demod is there */
-	if (tda1004x_read_byte(state, TDA1004X_CHIPID) != 0x25) {
+	id = tda1004x_read_byte(state, TDA1004X_CHIPID);
+	if (id < 0) {
+		printk(KERN_ERR "tda10045: chip is not answering. Giving up.\n");
+		kfree(state);
+		return NULL;
+	}
+
+	if (id != 0x25) {
+		printk(KERN_ERR "Invalid tda1004x ID = 0x%02x. Can't proceed\n", id);
 		kfree(state);
 		return NULL;
 	}
@@ -1307,11 +1318,14 @@ struct dvb_frontend* tda10046_attach(const struct tda1004x_config* config,
 				     struct i2c_adapter* i2c)
 {
 	struct tda1004x_state *state;
+	int id;
 
 	/* allocate memory for the internal state */
 	state = kmalloc(sizeof(struct tda1004x_state), GFP_KERNEL);
-	if (!state)
+	if (!state) {
+		printk(KERN_ERR "Can't alocate memory for tda10046 state\n");
 		return NULL;
+	}
 
 	/* setup the state */
 	state->config = config;
@@ -1319,7 +1333,14 @@ struct dvb_frontend* tda10046_attach(const struct tda1004x_config* config,
 	state->demod_type = TDA1004X_DEMOD_TDA10046;
 
 	/* check if the demod is there */
-	if (tda1004x_read_byte(state, TDA1004X_CHIPID) != 0x46) {
+	id = tda1004x_read_byte(state, TDA1004X_CHIPID);
+	if (id < 0) {
+		printk(KERN_ERR "tda10046: chip is not answering. Giving up.\n");
+		kfree(state);
+		return NULL;
+	}
+	if (id != 0x46) {
+		printk(KERN_ERR "Invalid tda1004x ID = 0x%02x. Can't proceed\n", id);
 		kfree(state);
 		return NULL;
 	}
diff --git a/drivers/media/dvb/ttpci/Kconfig b/drivers/media/dvb/ttpci/Kconfig
index d4339b1b3b6..07643e01009 100644
--- a/drivers/media/dvb/ttpci/Kconfig
+++ b/drivers/media/dvb/ttpci/Kconfig
@@ -101,6 +101,7 @@ config DVB_BUDGET
 config DVB_BUDGET_CI
 	tristate "Budget cards with onboard CI connector"
 	depends on DVB_BUDGET_CORE && I2C
+	depends on INPUT # due to IR
 	select DVB_STV0297 if !DVB_FE_CUSTOMISE
 	select DVB_STV0299 if !DVB_FE_CUSTOMISE
 	select DVB_TDA1004X if !DVB_FE_CUSTOMISE
diff --git a/drivers/media/dvb/ttpci/av7110_hw.c b/drivers/media/dvb/ttpci/av7110_hw.c
index 9d81074b31d..3a3f5279e92 100644
--- a/drivers/media/dvb/ttpci/av7110_hw.c
+++ b/drivers/media/dvb/ttpci/av7110_hw.c
@@ -427,6 +427,7 @@ static int __av7110_send_fw_cmd(struct av7110 *av7110, u16* buf, int length)
 			if (err) {
 				printk(KERN_ERR "%s: timeout waiting on busy %s QUEUE\n",
 					__func__, type);
+				av7110->arm_errors++;
 				return -ETIMEDOUT;
 			}
 			msleep(1);
@@ -853,10 +854,8 @@ static osd_raw_window_t bpp2bit[8] = {
 
 static inline int WaitUntilBmpLoaded(struct av7110 *av7110)
 {
-	int ret = wait_event_interruptible_timeout(av7110->bmpq,
+	int ret = wait_event_timeout(av7110->bmpq,
 				av7110->bmp_state != BMP_LOADING, 10*HZ);
-	if (ret == -ERESTARTSYS)
-		return ret;
 	if (ret == 0) {
 		printk("dvb-ttpci: warning: timeout waiting in LoadBitmap: %d, %d\n",
 		       ret, av7110->bmp_state);
diff --git a/drivers/media/video/Kconfig b/drivers/media/video/Kconfig
index 3b26fbd3e55..5ccb0aeca8c 100644
--- a/drivers/media/video/Kconfig
+++ b/drivers/media/video/Kconfig
@@ -793,6 +793,14 @@ menuconfig V4L_USB_DRIVERS
 
 if V4L_USB_DRIVERS && USB
 
+config USB_VIDEO_CLASS
+	tristate "USB Video Class (UVC)"
+	---help---
+	  Support for the USB Video Class (UVC).  Currently only video
+	  input devices, such as webcams, are supported.
+
+	  For more information see: <http://linux-uvc.berlios.de/>
+
 source "drivers/media/video/pvrusb2/Kconfig"
 
 source "drivers/media/video/em28xx/Kconfig"
diff --git a/drivers/media/video/Makefile b/drivers/media/video/Makefile
index dff0d6abe91..ecbbfaab24d 100644
--- a/drivers/media/video/Makefile
+++ b/drivers/media/video/Makefile
@@ -136,6 +136,8 @@ obj-$(CONFIG_SOC_CAMERA_MT9V022)	+= mt9v022.o
 
 obj-$(CONFIG_VIDEO_AU0828) += au0828/
 
+obj-$(CONFIG_USB_VIDEO_CLASS)	+= uvc/
+
 EXTRA_CFLAGS += -Idrivers/media/dvb/dvb-core
 EXTRA_CFLAGS += -Idrivers/media/dvb/frontends
 EXTRA_CFLAGS += -Idrivers/media/common/tuners
diff --git a/drivers/media/video/au0828/au0828-cards.c b/drivers/media/video/au0828/au0828-cards.c
index a2a6983444f..898e12395e7 100644
--- a/drivers/media/video/au0828/au0828-cards.c
+++ b/drivers/media/video/au0828/au0828-cards.c
@@ -77,8 +77,14 @@ static void hauppauge_eeprom(struct au0828_dev *dev, u8 *eeprom_data)
 
 	/* Make sure we support the board model */
 	switch (tv.model) {
+	case 72000: /* WinTV-HVR950q (Retail, IR, ATSC/QAM */
 	case 72001: /* WinTV-HVR950q (Retail, IR, ATSC/QAM and basic analog video */
+	case 72211: /* WinTV-HVR950q (OEM, IR, ATSC/QAM and basic analog video */
+	case 72221: /* WinTV-HVR950q (OEM, IR, ATSC/QAM and basic analog video */
+	case 72231: /* WinTV-HVR950q (OEM, IR, ATSC/QAM and basic analog video */
+	case 72241: /* WinTV-HVR950q (OEM, No IR, ATSC/QAM and basic analog video */
 	case 72301: /* WinTV-HVR850 (Retail, IR, ATSC and basic analog video */
+	case 72500: /* WinTV-HVR950q (OEM, No IR, ATSC/QAM */
 		break;
 	default:
 		printk(KERN_WARNING "%s: warning: "
@@ -175,6 +181,18 @@ struct usb_device_id au0828_usb_id_table [] = {
 		.driver_info = AU0828_BOARD_HAUPPAUGE_HVR850 },
 	{ USB_DEVICE(0x0fe9, 0xd620),
 		.driver_info = AU0828_BOARD_DVICO_FUSIONHDTV7 },
+	{ USB_DEVICE(0x2040, 0x7210),
+		.driver_info = AU0828_BOARD_HAUPPAUGE_HVR950Q },
+	{ USB_DEVICE(0x2040, 0x7217),
+		.driver_info = AU0828_BOARD_HAUPPAUGE_HVR950Q },
+	{ USB_DEVICE(0x2040, 0x721b),
+		.driver_info = AU0828_BOARD_HAUPPAUGE_HVR950Q },
+	{ USB_DEVICE(0x2040, 0x721f),
+		.driver_info = AU0828_BOARD_HAUPPAUGE_HVR950Q },
+	{ USB_DEVICE(0x2040, 0x7280),
+		.driver_info = AU0828_BOARD_HAUPPAUGE_HVR950Q },
+	{ USB_DEVICE(0x0fd9, 0x0008),
+		.driver_info = AU0828_BOARD_HAUPPAUGE_HVR950Q },
 	{ },
 };
 
diff --git a/drivers/media/video/cx18/Kconfig b/drivers/media/video/cx18/Kconfig
index 5f942690570..9aefdc5ea79 100644
--- a/drivers/media/video/cx18/Kconfig
+++ b/drivers/media/video/cx18/Kconfig
@@ -10,8 +10,8 @@ config VIDEO_CX18
 	select VIDEO_TVEEPROM
 	select VIDEO_CX2341X
 	select VIDEO_CS5345
-	select DVB_S5H1409
-	select MEDIA_TUNER_MXL5005S
+	select DVB_S5H1409 if !DVB_FE_CUSTOMISE
+	select MEDIA_TUNER_MXL5005S if !DVB_FE_CUSTOMISE
 	---help---
 	  This is a video4linux driver for Conexant cx23418 based
 	  PCI combo video recorder devices.
diff --git a/drivers/media/video/cx18/cx18-av-core.c b/drivers/media/video/cx18/cx18-av-core.c
index 9a26751615c..faca43eb940 100644
--- a/drivers/media/video/cx18/cx18-av-core.c
+++ b/drivers/media/video/cx18/cx18-av-core.c
@@ -69,6 +69,58 @@ int cx18_av_and_or4(struct cx18 *cx, u16 addr, u32 and_mask,
 			     or_value);
 }
 
+int cx18_av_write_no_acfg(struct cx18 *cx, u16 addr, u8 value, int no_acfg_mask)
+{
+	int retval;
+	u32 saved_reg[8] = {0};
+
+	if (no_acfg_mask & CXADEC_NO_ACFG_AFE) {
+		saved_reg[0] = cx18_av_read4(cx, CXADEC_CHIP_CTRL);
+		saved_reg[1] = cx18_av_read4(cx, CXADEC_AFE_CTRL);
+	}
+
+	if (no_acfg_mask & CXADEC_NO_ACFG_PLL) {
+		saved_reg[2] = cx18_av_read4(cx, CXADEC_PLL_CTRL1);
+		saved_reg[3] = cx18_av_read4(cx, CXADEC_VID_PLL_FRAC);
+	}
+
+	if (no_acfg_mask & CXADEC_NO_ACFG_VID) {
+		saved_reg[4] = cx18_av_read4(cx, CXADEC_HORIZ_TIM_CTRL);
+		saved_reg[5] = cx18_av_read4(cx, CXADEC_VERT_TIM_CTRL);
+		saved_reg[6] = cx18_av_read4(cx, CXADEC_SRC_COMB_CFG);
+		saved_reg[7] = cx18_av_read4(cx, CXADEC_CHROMA_VBIOFF_CFG);
+	}
+
+	retval = cx18_av_write(cx, addr, value);
+
+	if (no_acfg_mask & CXADEC_NO_ACFG_AFE) {
+		cx18_av_write4(cx, CXADEC_CHIP_CTRL, saved_reg[0]);
+		cx18_av_write4(cx, CXADEC_AFE_CTRL,  saved_reg[1]);
+	}
+
+	if (no_acfg_mask & CXADEC_NO_ACFG_PLL) {
+		cx18_av_write4(cx, CXADEC_PLL_CTRL1,    saved_reg[2]);
+		cx18_av_write4(cx, CXADEC_VID_PLL_FRAC, saved_reg[3]);
+	}
+
+	if (no_acfg_mask & CXADEC_NO_ACFG_VID) {
+		cx18_av_write4(cx, CXADEC_HORIZ_TIM_CTRL,    saved_reg[4]);
+		cx18_av_write4(cx, CXADEC_VERT_TIM_CTRL,     saved_reg[5]);
+		cx18_av_write4(cx, CXADEC_SRC_COMB_CFG,      saved_reg[6]);
+		cx18_av_write4(cx, CXADEC_CHROMA_VBIOFF_CFG, saved_reg[7]);
+	}
+
+	return retval;
+}
+
+int cx18_av_and_or_no_acfg(struct cx18 *cx, u16 addr, unsigned and_mask,
+			   u8 or_value, int no_acfg_mask)
+{
+	return cx18_av_write_no_acfg(cx, addr,
+				     (cx18_av_read(cx, addr) & and_mask) |
+				     or_value, no_acfg_mask);
+}
+
 /* ----------------------------------------------------------------------- */
 
 static int set_input(struct cx18 *cx, enum cx18_av_video_input vid_input,
@@ -170,13 +222,15 @@ static void input_change(struct cx18 *cx)
 
 	/* Follow step 8c and 8d of section 3.16 in the cx18_av datasheet */
 	if (std & V4L2_STD_SECAM)
-		cx18_av_write(cx, 0x402, 0);
+		cx18_av_write_no_acfg(cx, 0x402, 0, CXADEC_NO_ACFG_ALL);
 	else {
-		cx18_av_write(cx, 0x402, 0x04);
+		cx18_av_write_no_acfg(cx, 0x402, 0x04, CXADEC_NO_ACFG_ALL);
 		cx18_av_write(cx, 0x49f, (std & V4L2_STD_NTSC) ? 0x14 : 0x11);
 	}
-	cx18_av_and_or(cx, 0x401, ~0x60, 0);
-	cx18_av_and_or(cx, 0x401, ~0x60, 0x60);
+	cx18_av_and_or_no_acfg(cx, 0x401, ~0x60, 0,
+				CXADEC_NO_ACFG_PLL | CXADEC_NO_ACFG_VID);
+	cx18_av_and_or_no_acfg(cx, 0x401, ~0x60, 0x60,
+				CXADEC_NO_ACFG_PLL | CXADEC_NO_ACFG_VID);
 
 	if (std & V4L2_STD_525_60) {
 		if (std == V4L2_STD_NTSC_M_JP) {
@@ -228,7 +282,7 @@ static int set_input(struct cx18 *cx, enum cx18_av_video_input vid_input,
 
 		if ((vid_input & ~0xff0) ||
 		    luma < CX18_AV_SVIDEO_LUMA1 ||
-		    luma > CX18_AV_SVIDEO_LUMA4 ||
+		    luma > CX18_AV_SVIDEO_LUMA8 ||
 		    chroma < CX18_AV_SVIDEO_CHROMA4 ||
 		    chroma > CX18_AV_SVIDEO_CHROMA8) {
 			CX18_ERR("0x%04x is not a valid video input!\n",
@@ -262,7 +316,8 @@ static int set_input(struct cx18 *cx, enum cx18_av_video_input vid_input,
 
 	cx18_av_write(cx, 0x103, reg);
 	/* Set INPUT_MODE to Composite (0) or S-Video (1) */
-	cx18_av_and_or(cx, 0x401, ~0x6, is_composite ? 0 : 0x02);
+	cx18_av_and_or_no_acfg(cx, 0x401, ~0x6, is_composite ? 0 : 0x02,
+				CXADEC_NO_ACFG_PLL | CXADEC_NO_ACFG_VID);
 	/* Set CH_SEL_ADC2 to 1 if input comes from CH3 */
 	cx18_av_and_or(cx, 0x102, ~0x2, (reg & 0x80) == 0 ? 2 : 0);
 	/* Set DUAL_MODE_ADC2 to 1 if input comes from both CH2 and CH3 */
@@ -318,12 +373,12 @@ static int set_v4lstd(struct cx18 *cx)
 	   This happens for example with the Yuan MPC622. */
 	if (fmt >= 4 && fmt < 8) {
 		/* Set format to NTSC-M */
-		cx18_av_and_or(cx, 0x400, ~0xf, 1);
+		cx18_av_and_or_no_acfg(cx, 0x400, ~0xf, 1, CXADEC_NO_ACFG_AFE);
 		/* Turn off LCOMB */
 		cx18_av_and_or(cx, 0x47b, ~6, 0);
 	}
-	cx18_av_and_or(cx, 0x400, ~0xf, fmt);
-	cx18_av_and_or(cx, 0x403, ~0x3, pal_m);
+	cx18_av_and_or_no_acfg(cx, 0x400, ~0xf, fmt, CXADEC_NO_ACFG_AFE);
+	cx18_av_and_or_no_acfg(cx, 0x403, ~0x3, pal_m, CXADEC_NO_ACFG_ALL);
 	cx18_av_vbi_setup(cx);
 	input_change(cx);
 	return 0;
diff --git a/drivers/media/video/cx18/cx18-av-core.h b/drivers/media/video/cx18/cx18-av-core.h
index 786901d72e9..c172823ce1d 100644
--- a/drivers/media/video/cx18/cx18-av-core.h
+++ b/drivers/media/video/cx18/cx18-av-core.h
@@ -37,12 +37,16 @@ enum cx18_av_video_input {
 	CX18_AV_COMPOSITE7,
 	CX18_AV_COMPOSITE8,
 
-	/* S-Video inputs consist of one luma input (In1-In4) ORed with one
+	/* S-Video inputs consist of one luma input (In1-In8) ORed with one
 	   chroma input (In5-In8) */
 	CX18_AV_SVIDEO_LUMA1 = 0x10,
 	CX18_AV_SVIDEO_LUMA2 = 0x20,
 	CX18_AV_SVIDEO_LUMA3 = 0x30,
 	CX18_AV_SVIDEO_LUMA4 = 0x40,
+	CX18_AV_SVIDEO_LUMA5 = 0x50,
+	CX18_AV_SVIDEO_LUMA6 = 0x60,
+	CX18_AV_SVIDEO_LUMA7 = 0x70,
+	CX18_AV_SVIDEO_LUMA8 = 0x80,
 	CX18_AV_SVIDEO_CHROMA4 = 0x400,
 	CX18_AV_SVIDEO_CHROMA5 = 0x500,
 	CX18_AV_SVIDEO_CHROMA6 = 0x600,
@@ -291,14 +295,24 @@ struct cx18_av_state {
 #define CXADEC_SELECT_AUDIO_STANDARD_FM    0xF9  /* FM radio */
 #define CXADEC_SELECT_AUDIO_STANDARD_AUTO  0xFF  /* Auto detect */
 
+/* Flags on what to preserve on write to 0x400-0x403 with cx18_av_.*_no_acfg()*/
+#define CXADEC_NO_ACFG_AFE	0x01 /* Preserve 0x100-0x107 */
+#define CXADEC_NO_ACFG_PLL	0x02 /* Preserve 0x108-0x10f */
+#define CXADEC_NO_ACFG_VID	0x04 /* Preserve 0x470-0x47f */
+#define CXADEC_NO_ACFG_ALL	0x07
+
 /* ----------------------------------------------------------------------- */
 /* cx18_av-core.c 							   */
 int cx18_av_write(struct cx18 *cx, u16 addr, u8 value);
 int cx18_av_write4(struct cx18 *cx, u16 addr, u32 value);
+int cx18_av_write_no_acfg(struct cx18 *cx, u16 addr, u8 value,
+				int no_acfg_mask);
 u8 cx18_av_read(struct cx18 *cx, u16 addr);
 u32 cx18_av_read4(struct cx18 *cx, u16 addr);
 int cx18_av_and_or(struct cx18 *cx, u16 addr, unsigned mask, u8 value);
 int cx18_av_and_or4(struct cx18 *cx, u16 addr, u32 mask, u32 value);
+int cx18_av_and_or_no_acfg(struct cx18 *cx, u16 addr, unsigned mask, u8 value,
+				int no_acfg_mask);
 int cx18_av_cmd(struct cx18 *cx, unsigned int cmd, void *arg);
 
 /* ----------------------------------------------------------------------- */
diff --git a/drivers/media/video/cx18/cx18-cards.c b/drivers/media/video/cx18/cx18-cards.c
index baccd079243..c26e0ef5b07 100644
--- a/drivers/media/video/cx18/cx18-cards.c
+++ b/drivers/media/video/cx18/cx18-cards.c
@@ -23,6 +23,7 @@
 
 #include "cx18-driver.h"
 #include "cx18-cards.h"
+#include "cx18-av-core.h"
 #include "cx18-i2c.h"
 #include <media/cs5345.h>
 
@@ -54,22 +55,22 @@ static const struct cx18_card cx18_card_hvr1600_esmt = {
 	.hw_all = CX18_HW_TVEEPROM | CX18_HW_TUNER |
 		  CX18_HW_CS5345 | CX18_HW_DVB,
 	.video_inputs = {
-		{ CX18_CARD_INPUT_VID_TUNER,  0, CX23418_COMPOSITE7 },
-		{ CX18_CARD_INPUT_SVIDEO1,    1, CX23418_SVIDEO1    },
-		{ CX18_CARD_INPUT_COMPOSITE1, 1, CX23418_COMPOSITE3 },
-		{ CX18_CARD_INPUT_SVIDEO2,    2, CX23418_SVIDEO2    },
-		{ CX18_CARD_INPUT_COMPOSITE2, 2, CX23418_COMPOSITE4 },
+		{ CX18_CARD_INPUT_VID_TUNER,  0, CX18_AV_COMPOSITE7 },
+		{ CX18_CARD_INPUT_SVIDEO1,    1, CX18_AV_SVIDEO1    },
+		{ CX18_CARD_INPUT_COMPOSITE1, 1, CX18_AV_COMPOSITE3 },
+		{ CX18_CARD_INPUT_SVIDEO2,    2, CX18_AV_SVIDEO2    },
+		{ CX18_CARD_INPUT_COMPOSITE2, 2, CX18_AV_COMPOSITE4 },
 	},
 	.audio_inputs = {
 		{ CX18_CARD_INPUT_AUD_TUNER,
-		  CX23418_AUDIO8, CS5345_IN_1 | CS5345_MCLK_1_5 },
+		  CX18_AV_AUDIO8, CS5345_IN_1 | CS5345_MCLK_1_5 },
 		{ CX18_CARD_INPUT_LINE_IN1,
-		  CX23418_AUDIO_SERIAL, CS5345_IN_2 },
+		  CX18_AV_AUDIO_SERIAL, CS5345_IN_2 },
 		{ CX18_CARD_INPUT_LINE_IN2,
-		  CX23418_AUDIO_SERIAL, CS5345_IN_2 },
+		  CX18_AV_AUDIO_SERIAL, CS5345_IN_3 },
 	},
 	.radio_input = { CX18_CARD_INPUT_AUD_TUNER,
-			 CX23418_AUDIO_SERIAL, 0 },
+			 CX18_AV_AUDIO_SERIAL, CS5345_IN_4 },
 	.ddr = {
 		/* ESMT M13S128324A-5B memory */
 		.chip_config = 0x003,
@@ -81,6 +82,11 @@ static const struct cx18_card cx18_card_hvr1600_esmt = {
 	},
 	.gpio_init.initial_value = 0x3001,
 	.gpio_init.direction = 0x3001,
+	.gpio_i2c_slave_reset = {
+		.active_lo_mask = 0x3001,
+		.msecs_asserted = 10,
+		.msecs_recovery = 40,
+	},
 	.i2c = &cx18_i2c_std,
 };
 
@@ -94,22 +100,22 @@ static const struct cx18_card cx18_card_hvr1600_samsung = {
 	.hw_all = CX18_HW_TVEEPROM | CX18_HW_TUNER |
 		  CX18_HW_CS5345 | CX18_HW_DVB,
 	.video_inputs = {
-		{ CX18_CARD_INPUT_VID_TUNER,  0, CX23418_COMPOSITE7 },
-		{ CX18_CARD_INPUT_SVIDEO1,    1, CX23418_SVIDEO1    },
-		{ CX18_CARD_INPUT_COMPOSITE1, 1, CX23418_COMPOSITE3 },
-		{ CX18_CARD_INPUT_SVIDEO2,    2, CX23418_SVIDEO2    },
-		{ CX18_CARD_INPUT_COMPOSITE2, 2, CX23418_COMPOSITE4 },
+		{ CX18_CARD_INPUT_VID_TUNER,  0, CX18_AV_COMPOSITE7 },
+		{ CX18_CARD_INPUT_SVIDEO1,    1, CX18_AV_SVIDEO1    },
+		{ CX18_CARD_INPUT_COMPOSITE1, 1, CX18_AV_COMPOSITE3 },
+		{ CX18_CARD_INPUT_SVIDEO2,    2, CX18_AV_SVIDEO2    },
+		{ CX18_CARD_INPUT_COMPOSITE2, 2, CX18_AV_COMPOSITE4 },
 	},
 	.audio_inputs = {
 		{ CX18_CARD_INPUT_AUD_TUNER,
-		  CX23418_AUDIO8, CS5345_IN_1 | CS5345_MCLK_1_5 },
+		  CX18_AV_AUDIO8, CS5345_IN_1 | CS5345_MCLK_1_5 },
 		{ CX18_CARD_INPUT_LINE_IN1,
-		  CX23418_AUDIO_SERIAL, CS5345_IN_2 },
+		  CX18_AV_AUDIO_SERIAL, CS5345_IN_2 },
 		{ CX18_CARD_INPUT_LINE_IN2,
-		  CX23418_AUDIO_SERIAL, CS5345_IN_2 },
+		  CX18_AV_AUDIO_SERIAL, CS5345_IN_3 },
 	},
 	.radio_input = { CX18_CARD_INPUT_AUD_TUNER,
-			 CX23418_AUDIO_SERIAL, 0 },
+			 CX18_AV_AUDIO_SERIAL, CS5345_IN_4 },
 	.ddr = {
 		/* Samsung K4D263238G-VC33 memory */
 		.chip_config = 0x003,
@@ -121,6 +127,11 @@ static const struct cx18_card cx18_card_hvr1600_samsung = {
 	},
 	.gpio_init.initial_value = 0x3001,
 	.gpio_init.direction = 0x3001,
+	.gpio_i2c_slave_reset = {
+		.active_lo_mask = 0x3001,
+		.msecs_asserted = 10,
+		.msecs_recovery = 40,
+	},
 	.i2c = &cx18_i2c_std,
 };
 
@@ -141,19 +152,19 @@ static const struct cx18_card cx18_card_h900 = {
 	.hw_audio_ctrl = CX18_HW_CX23418,
 	.hw_all = CX18_HW_TUNER,
 	.video_inputs = {
-		{ CX18_CARD_INPUT_VID_TUNER,  0, CX23418_COMPOSITE2 },
+		{ CX18_CARD_INPUT_VID_TUNER,  0, CX18_AV_COMPOSITE2 },
 		{ CX18_CARD_INPUT_SVIDEO1,    1,
-			CX23418_SVIDEO_LUMA3 | CX23418_SVIDEO_CHROMA4 },
-		{ CX18_CARD_INPUT_COMPOSITE1, 1, CX23418_COMPOSITE1 },
+			CX18_AV_SVIDEO_LUMA3 | CX18_AV_SVIDEO_CHROMA4 },
+		{ CX18_CARD_INPUT_COMPOSITE1, 1, CX18_AV_COMPOSITE1 },
 	},
 	.audio_inputs = {
 		{ CX18_CARD_INPUT_AUD_TUNER,
-		  CX23418_AUDIO8, 0 },
+		  CX18_AV_AUDIO8, 0 },
 		{ CX18_CARD_INPUT_LINE_IN1,
-		  CX23418_AUDIO_SERIAL, 0 },
+		  CX18_AV_AUDIO_SERIAL, 0 },
 	},
 	.radio_input = { CX18_CARD_INPUT_AUD_TUNER,
-			 CX23418_AUDIO_SERIAL, 0 },
+			 CX18_AV_AUDIO_SERIAL, 0 },
 	.tuners = {
 		{ .std = V4L2_STD_ALL, .tuner = TUNER_XC2028 },
 	},
@@ -183,23 +194,26 @@ static const struct cx18_card_pci_info cx18_pci_mpc718[] = {
 static const struct cx18_card cx18_card_mpc718 = {
 	.type = CX18_CARD_YUAN_MPC718,
 	.name = "Yuan MPC718",
-	.comment = "Not yet supported!\n",
-	.v4l2_capabilities = 0,
+	.comment = "Some Composite and S-Video inputs are currently working.\n",
+	.v4l2_capabilities = CX18_CAP_ENCODER,
 	.hw_audio_ctrl = CX18_HW_CX23418,
 	.hw_all = CX18_HW_TUNER,
 	.video_inputs = {
-		{ CX18_CARD_INPUT_VID_TUNER,  0, CX23418_COMPOSITE7 },
-		{ CX18_CARD_INPUT_SVIDEO1,    1, CX23418_SVIDEO1    },
-		{ CX18_CARD_INPUT_COMPOSITE1, 1, CX23418_COMPOSITE3 },
+		{ CX18_CARD_INPUT_VID_TUNER,  0, CX18_AV_COMPOSITE2 },
+		{ CX18_CARD_INPUT_SVIDEO1,    1,
+				CX18_AV_SVIDEO_LUMA3 | CX18_AV_SVIDEO_CHROMA4 },
+		{ CX18_CARD_INPUT_COMPOSITE1, 1, CX18_AV_COMPOSITE1 },
+		{ CX18_CARD_INPUT_SVIDEO2,    2,
+				CX18_AV_SVIDEO_LUMA7 | CX18_AV_SVIDEO_CHROMA8 },
+		{ CX18_CARD_INPUT_COMPOSITE2, 2, CX18_AV_COMPOSITE6 },
+		{ CX18_CARD_INPUT_COMPOSITE3, 2, CX18_AV_COMPOSITE3 },
 	},
 	.audio_inputs = {
-		{ CX18_CARD_INPUT_AUD_TUNER,
-		  CX23418_AUDIO8, 0 },
-		{ CX18_CARD_INPUT_LINE_IN1,
-		  CX23418_AUDIO_SERIAL, 0 },
+		{ CX18_CARD_INPUT_AUD_TUNER, CX18_AV_AUDIO5,       0 },
+		{ CX18_CARD_INPUT_LINE_IN1,  CX18_AV_AUDIO_SERIAL, 0 },
+		{ CX18_CARD_INPUT_LINE_IN2,  CX18_AV_AUDIO_SERIAL, 0 },
 	},
-	.radio_input = { CX18_CARD_INPUT_AUD_TUNER,
-			 CX23418_AUDIO_SERIAL, 0 },
+	.radio_input = { CX18_CARD_INPUT_AUD_TUNER, CX18_AV_AUDIO_SERIAL, 0 },
 	.tuners = {
 		/* XC3028 tuner */
 		{ .std = V4L2_STD_ALL, .tuner = TUNER_XC2028 },
diff --git a/drivers/media/video/cx18/cx18-cards.h b/drivers/media/video/cx18/cx18-cards.h
index bccb67f0db1..dc2dd945d4c 100644
--- a/drivers/media/video/cx18/cx18-cards.h
+++ b/drivers/media/video/cx18/cx18-cards.h
@@ -36,36 +36,6 @@
 #define	CX18_CARD_INPUT_COMPOSITE2 	5
 #define	CX18_CARD_INPUT_COMPOSITE3 	6
 
-enum cx34180_video_input {
-	/* Composite video inputs In1-In8 */
-	CX23418_COMPOSITE1 = 1,
-	CX23418_COMPOSITE2,
-	CX23418_COMPOSITE3,
-	CX23418_COMPOSITE4,
-	CX23418_COMPOSITE5,
-	CX23418_COMPOSITE6,
-	CX23418_COMPOSITE7,
-	CX23418_COMPOSITE8,
-
-	/* S-Video inputs consist of one luma input (In1-In4) ORed with one
-	   chroma input (In5-In8) */
-	CX23418_SVIDEO_LUMA1 = 0x10,
-	CX23418_SVIDEO_LUMA2 = 0x20,
-	CX23418_SVIDEO_LUMA3 = 0x30,
-	CX23418_SVIDEO_LUMA4 = 0x40,
-	CX23418_SVIDEO_CHROMA4 = 0x400,
-	CX23418_SVIDEO_CHROMA5 = 0x500,
-	CX23418_SVIDEO_CHROMA6 = 0x600,
-	CX23418_SVIDEO_CHROMA7 = 0x700,
-	CX23418_SVIDEO_CHROMA8 = 0x800,
-
-	/* S-Video aliases for common luma/chroma combinations */
-	CX23418_SVIDEO1 = 0x510,
-	CX23418_SVIDEO2 = 0x620,
-	CX23418_SVIDEO3 = 0x730,
-	CX23418_SVIDEO4 = 0x840,
-};
-
 /* audio inputs */
 #define	CX18_CARD_INPUT_AUD_TUNER	1
 #define	CX18_CARD_INPUT_LINE_IN1 	2
@@ -75,16 +45,6 @@ enum cx34180_video_input {
 #define CX18_CARD_MAX_AUDIO_INPUTS 3
 #define CX18_CARD_MAX_TUNERS  	   2
 
-enum cx23418_audio_input {
-	/* Audio inputs: serial or In4-In8 */
-	CX23418_AUDIO_SERIAL,
-	CX23418_AUDIO4 = 4,
-	CX23418_AUDIO5,
-	CX23418_AUDIO6,
-	CX23418_AUDIO7,
-	CX23418_AUDIO8,
-};
-
 /* V4L2 capability aliases */
 #define CX18_CAP_ENCODER (V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_TUNER | \
 			  V4L2_CAP_AUDIO | V4L2_CAP_READWRITE)
@@ -118,6 +78,13 @@ struct cx18_gpio_init { /* set initial GPIO DIR and OUT values */
 	u32 initial_value;
 };
 
+struct cx18_gpio_i2c_slave_reset {
+	u32 active_lo_mask; /* GPIO outputs that reset i2c chips when low */
+	u32 active_hi_mask; /* GPIO outputs that reset i2c chips when high */
+	int msecs_asserted; /* time period reset must remain asserted */
+	int msecs_recovery; /* time after deassert for chips to be ready */
+};
+
 struct cx18_card_tuner {
 	v4l2_std_id std; 	/* standard for which the tuner is suitable */
 	int 	    tuner; 	/* tuner ID (from tuner.h) */
@@ -154,7 +121,8 @@ struct cx18_card {
 
 	/* GPIO card-specific settings */
 	u8 xceive_pin; 		/* XCeive tuner GPIO reset pin */
-	struct cx18_gpio_init 		gpio_init;
+	struct cx18_gpio_init 		 gpio_init;
+	struct cx18_gpio_i2c_slave_reset gpio_i2c_slave_reset;
 
 	struct cx18_card_tuner tuners[CX18_CARD_MAX_TUNERS];
 	struct cx18_card_tuner_i2c *i2c;
diff --git a/drivers/media/video/cx18/cx18-dvb.c b/drivers/media/video/cx18/cx18-dvb.c
index c9744173f96..cae38985b13 100644
--- a/drivers/media/video/cx18/cx18-dvb.c
+++ b/drivers/media/video/cx18/cx18-dvb.c
@@ -69,11 +69,21 @@ static int cx18_dvb_start_feed(struct dvb_demux_feed *feed)
 	struct dvb_demux *demux = feed->demux;
 	struct cx18_stream *stream = (struct cx18_stream *) demux->priv;
 	struct cx18 *cx = stream->cx;
-	int ret = -EINVAL;
+	int ret;
 	u32 v;
 
 	CX18_DEBUG_INFO("Start feed: pid = 0x%x index = %d\n",
 			feed->pid, feed->index);
+
+	mutex_lock(&cx->serialize_lock);
+	ret = cx18_init_on_first_open(cx);
+	mutex_unlock(&cx->serialize_lock);
+	if (ret) {
+		CX18_ERR("Failed to initialize firmware starting DVB feed\n");
+		return ret;
+	}
+	ret = -EINVAL;
+
 	switch (cx->card->type) {
 	case CX18_CARD_HVR_1600_ESMT:
 	case CX18_CARD_HVR_1600_SAMSUNG:
@@ -101,6 +111,11 @@ static int cx18_dvb_start_feed(struct dvb_demux_feed *feed)
 		if (stream->dvb.feeding++ == 0) {
 			CX18_DEBUG_INFO("Starting Transport DMA\n");
 			ret = cx18_start_v4l2_encode_stream(stream);
+			if (ret < 0) {
+				CX18_DEBUG_INFO(
+					"Failed to start Transport DMA\n");
+				stream->dvb.feeding--;
+			}
 		} else
 			ret = 0;
 		mutex_unlock(&stream->dvb.feedlock);
diff --git a/drivers/media/video/cx18/cx18-gpio.c b/drivers/media/video/cx18/cx18-gpio.c
index ceb63653c92..b302833f6f9 100644
--- a/drivers/media/video/cx18/cx18-gpio.c
+++ b/drivers/media/video/cx18/cx18-gpio.c
@@ -53,10 +53,34 @@ static void gpio_write(struct cx18 *cx)
 	write_reg(((dir & 0xffff) << 16) | (val & 0xffff),
 			CX18_REG_GPIO_OUT1);
 	write_reg(dir & 0xffff0000, CX18_REG_GPIO_DIR2);
-	write_reg((dir & 0xffff0000) | ((val & 0xffff0000) >> 16),
+	write_reg_sync((dir & 0xffff0000) | ((val & 0xffff0000) >> 16),
 			CX18_REG_GPIO_OUT2);
 }
 
+void cx18_reset_i2c_slaves_gpio(struct cx18 *cx)
+{
+	const struct cx18_gpio_i2c_slave_reset *p;
+
+	p = &cx->card->gpio_i2c_slave_reset;
+
+	if ((p->active_lo_mask | p->active_hi_mask) == 0)
+		return;
+
+	/* Assuming that the masks are a subset of the bits in gpio_dir */
+
+	/* Assert */
+	cx->gpio_val =
+		(cx->gpio_val | p->active_hi_mask) & ~(p->active_lo_mask);
+	gpio_write(cx);
+	schedule_timeout_uninterruptible(msecs_to_jiffies(p->msecs_asserted));
+
+	/* Deassert */
+	cx->gpio_val =
+		(cx->gpio_val | p->active_lo_mask) & ~(p->active_hi_mask);
+	gpio_write(cx);
+	schedule_timeout_uninterruptible(msecs_to_jiffies(p->msecs_recovery));
+}
+
 void cx18_gpio_init(struct cx18 *cx)
 {
 	cx->gpio_dir = cx->card->gpio_init.direction;
diff --git a/drivers/media/video/cx18/cx18-gpio.h b/drivers/media/video/cx18/cx18-gpio.h
index 41bac8856b5..525c328f748 100644
--- a/drivers/media/video/cx18/cx18-gpio.h
+++ b/drivers/media/video/cx18/cx18-gpio.h
@@ -21,4 +21,5 @@
  */
 
 void cx18_gpio_init(struct cx18 *cx);
+void cx18_reset_i2c_slaves_gpio(struct cx18 *cx);
 int cx18_reset_tuner_gpio(void *dev, int cmd, int value);
diff --git a/drivers/media/video/cx18/cx18-i2c.c b/drivers/media/video/cx18/cx18-i2c.c
index 1d6c51a7531..680bc4e35b7 100644
--- a/drivers/media/video/cx18/cx18-i2c.c
+++ b/drivers/media/video/cx18/cx18-i2c.c
@@ -405,6 +405,8 @@ int init_cx18_i2c(struct cx18 *cx)
 	cx18_setscl(&cx->i2c_algo_cb_data[1], 1);
 	cx18_setsda(&cx->i2c_algo_cb_data[1], 1);
 
+	cx18_reset_i2c_slaves_gpio(cx);
+
 	return i2c_bit_add_bus(&cx->i2c_adap[0]) ||
 		i2c_bit_add_bus(&cx->i2c_adap[1]);
 }
diff --git a/drivers/media/video/cx25840/cx25840-core.c b/drivers/media/video/cx25840/cx25840-core.c
index 607efdcd22f..1da6f134888 100644
--- a/drivers/media/video/cx25840/cx25840-core.c
+++ b/drivers/media/video/cx25840/cx25840-core.c
@@ -433,7 +433,7 @@ static int set_input(struct i2c_client *client, enum cx25840_video_input vid_inp
 		int chroma = vid_input & 0xf00;
 
 		if ((vid_input & ~0xff0) ||
-		    luma < CX25840_SVIDEO_LUMA1 || luma > CX25840_SVIDEO_LUMA4 ||
+		    luma < CX25840_SVIDEO_LUMA1 || luma > CX25840_SVIDEO_LUMA8 ||
 		    chroma < CX25840_SVIDEO_CHROMA4 || chroma > CX25840_SVIDEO_CHROMA8) {
 			v4l_err(client, "0x%04x is not a valid video input!\n",
 				vid_input);
diff --git a/drivers/media/video/cx88/cx88-alsa.c b/drivers/media/video/cx88/cx88-alsa.c
index e976fc6bef7..80c8883e54b 100644
--- a/drivers/media/video/cx88/cx88-alsa.c
+++ b/drivers/media/video/cx88/cx88-alsa.c
@@ -332,6 +332,12 @@ static int snd_cx88_pcm_open(struct snd_pcm_substream *substream)
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	int err;
 
+	if (!chip) {
+		printk(KERN_ERR "BUG: cx88 can't find device struct."
+				" Can't proceed with open\n");
+		return -ENODEV;
+	}
+
 	err = snd_pcm_hw_constraint_pow2(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS);
 	if (err < 0)
 		goto _error;
diff --git a/drivers/media/video/em28xx/em28xx-audio.c b/drivers/media/video/em28xx/em28xx-audio.c
index 92b2a6db4fd..3c006103c1e 100644
--- a/drivers/media/video/em28xx/em28xx-audio.c
+++ b/drivers/media/video/em28xx/em28xx-audio.c
@@ -268,6 +268,12 @@ static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
 
 	dprintk("opening device and trying to acquire exclusive lock\n");
 
+	if (!dev) {
+		printk(KERN_ERR "BUG: em28xx can't find device struct."
+				" Can't proceed with open\n");
+		return -ENODEV;
+	}
+
 	/* Sets volume, mute, etc */
 
 	dev->mute = 0;
@@ -415,6 +421,12 @@ static int em28xx_audio_init(struct em28xx *dev)
 	static int          devnr;
 	int                 ret, err;
 
+	if (dev->has_audio_class) {
+		/* This device does not support the extension (in this case
+		   the device is expecting the snd-usb-audio module */
+		return 0;
+	}
+
 	printk(KERN_INFO "em28xx-audio.c: probing for em28x1 "
 			 "non standard usbaudio\n");
 	printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus "
@@ -458,6 +470,12 @@ static int em28xx_audio_fini(struct em28xx *dev)
 	if (dev == NULL)
 		return 0;
 
+	if (dev->has_audio_class) {
+		/* This device does not support the extension (in this case
+		   the device is expecting the snd-usb-audio module */
+		return 0;
+	}
+
 	if (dev->adev) {
 		snd_card_free(dev->adev->sndcard);
 		kfree(dev->adev);
diff --git a/drivers/media/video/em28xx/em28xx-cards.c b/drivers/media/video/em28xx/em28xx-cards.c
index 3e4f3c7e92e..8cbda43727c 100644
--- a/drivers/media/video/em28xx/em28xx-cards.c
+++ b/drivers/media/video/em28xx/em28xx-cards.c
@@ -157,6 +157,7 @@ struct em28xx_board em28xx_boards[] = {
 		.tda9887_conf = TDA9887_PRESENT,
 		.tuner_type   = TUNER_XC2028,
 		.mts_firmware = 1,
+		.has_dvb        = 1,
 		.decoder      = EM28XX_TVP5150,
 		.input          = { {
 			.type     = EM28XX_VMUX_TELEVISION,
@@ -524,6 +525,9 @@ void em28xx_pre_card_setup(struct em28xx *dev)
 	rc = em28xx_read_reg(dev, EM28XX_R0A_CHIPID);
 	if (rc > 0) {
 		switch (rc) {
+		case CHIP_ID_EM2860:
+			em28xx_info("chip ID is em2860\n");
+			break;
 		case CHIP_ID_EM2883:
 			em28xx_info("chip ID is em2882/em2883\n");
 			dev->wait_after_write = 0;
diff --git a/drivers/media/video/em28xx/em28xx-dvb.c b/drivers/media/video/em28xx/em28xx-dvb.c
index 8cf4983f003..0b2333ee07f 100644
--- a/drivers/media/video/em28xx/em28xx-dvb.c
+++ b/drivers/media/video/em28xx/em28xx-dvb.c
@@ -382,6 +382,11 @@ static int dvb_init(struct em28xx *dev)
 	int result = 0;
 	struct em28xx_dvb *dvb;
 
+	if (!dev->has_dvb) {
+		/* This device does not support the extension */
+		return 0;
+	}
+
 	dvb = kzalloc(sizeof(struct em28xx_dvb), GFP_KERNEL);
 
 	if (dvb == NULL) {
@@ -444,6 +449,11 @@ out_free:
 
 static int dvb_fini(struct em28xx *dev)
 {
+	if (!dev->has_dvb) {
+		/* This device does not support the extension */
+		return 0;
+	}
+
 	if (dev->dvb) {
 		unregister_dvb(dev->dvb);
 		dev->dvb = NULL;
diff --git a/drivers/media/video/em28xx/em28xx-reg.h b/drivers/media/video/em28xx/em28xx-reg.h
index 9058bed0795..fac1ab23f62 100644
--- a/drivers/media/video/em28xx/em28xx-reg.h
+++ b/drivers/media/video/em28xx/em28xx-reg.h
@@ -84,5 +84,6 @@
 
 /* FIXME: Need to be populated with the other chip ID's */
 enum em28xx_chip_id {
+	CHIP_ID_EM2860 = 34,
 	CHIP_ID_EM2883 = 36,
 };
diff --git a/drivers/media/video/em28xx/em28xx-video.c b/drivers/media/video/em28xx/em28xx-video.c
index fb163ecd921..285bc62bbe4 100644
--- a/drivers/media/video/em28xx/em28xx-video.c
+++ b/drivers/media/video/em28xx/em28xx-video.c
@@ -1848,32 +1848,28 @@ static DEFINE_MUTEX(em28xx_extension_devlist_lock);
 
 int em28xx_register_extension(struct em28xx_ops *ops)
 {
-	struct em28xx *h, *dev = NULL;
-
-	list_for_each_entry(h, &em28xx_devlist, devlist)
-		dev = h;
+	struct em28xx *dev = NULL;
 
 	mutex_lock(&em28xx_extension_devlist_lock);
 	list_add_tail(&ops->next, &em28xx_extension_devlist);
-	if (dev)
-		ops->init(dev);
-
+	list_for_each_entry(dev, &em28xx_devlist, devlist) {
+		if (dev)
+			ops->init(dev);
+	}
 	printk(KERN_INFO "Em28xx: Initialized (%s) extension\n", ops->name);
 	mutex_unlock(&em28xx_extension_devlist_lock);
-
 	return 0;
 }
 EXPORT_SYMBOL(em28xx_register_extension);
 
 void em28xx_unregister_extension(struct em28xx_ops *ops)
 {
-	struct em28xx *h, *dev = NULL;
-
-	list_for_each_entry(h, &em28xx_devlist, devlist)
-		dev = h;
+	struct em28xx *dev = NULL;
 
-	if (dev)
-		ops->fini(dev);
+	list_for_each_entry(dev, &em28xx_devlist, devlist) {
+		if (dev)
+			ops->fini(dev);
+	}
 
 	mutex_lock(&em28xx_extension_devlist_lock);
 	printk(KERN_INFO "Em28xx: Removed (%s) extension\n", ops->name);
diff --git a/drivers/media/video/pxa_camera.c b/drivers/media/video/pxa_camera.c
index 7cc8e9b19fb..5ec5bb9a94d 100644
--- a/drivers/media/video/pxa_camera.c
+++ b/drivers/media/video/pxa_camera.c
@@ -1019,12 +1019,12 @@ static int pxa_camera_probe(struct platform_device *pdev)
 	struct pxa_camera_dev *pcdev;
 	struct resource *res;
 	void __iomem *base;
-	unsigned int irq;
+	int irq;
 	int err = 0;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	irq = platform_get_irq(pdev, 0);
-	if (!res || !irq) {
+	if (!res || irq < 0) {
 		err = -ENODEV;
 		goto exit;
 	}
diff --git a/drivers/media/video/saa7134/saa7134-alsa.c b/drivers/media/video/saa7134/saa7134-alsa.c
index ba3082422a0..f118de6e367 100644
--- a/drivers/media/video/saa7134/saa7134-alsa.c
+++ b/drivers/media/video/saa7134/saa7134-alsa.c
@@ -613,9 +613,15 @@ static int snd_card_saa7134_capture_open(struct snd_pcm_substream * substream)
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	snd_card_saa7134_pcm_t *pcm;
 	snd_card_saa7134_t *saa7134 = snd_pcm_substream_chip(substream);
-	struct saa7134_dev *dev = saa7134->dev;
+	struct saa7134_dev *dev;
 	int amux, err;
 
+	if (!saa7134) {
+		printk(KERN_ERR "BUG: saa7134 can't find device struct."
+				" Can't proceed with open\n");
+		return -ENODEV;
+	}
+	dev = saa7134->dev;
 	mutex_lock(&dev->dmasound.lock);
 
 	dev->dmasound.read_count  = 0;
diff --git a/drivers/media/video/saa7134/saa7134-cards.c b/drivers/media/video/saa7134/saa7134-cards.c
index b111903aa32..2618cfa592e 100644
--- a/drivers/media/video/saa7134/saa7134-cards.c
+++ b/drivers/media/video/saa7134/saa7134-cards.c
@@ -4114,11 +4114,7 @@ struct saa7134_board saa7134_boards[] = {
 		.radio_type     = UNSET,
 		.tuner_addr	= ADDR_UNSET,
 		.radio_addr	= ADDR_UNSET,
-		 /*
-		    TODO:
 		 .mpeg           = SAA7134_MPEG_DVB,
-		 */
-
 		 .inputs         = {{
 			 .name = name_tv,
 			 .vmux = 1,
@@ -4157,7 +4153,7 @@ struct saa7134_board saa7134_boards[] = {
 		} },
 		.radio = {
 			.name = name_radio,
-			.amux = LINE1,
+			.amux = TV,
 		},
 	},
 	[SAA7134_BOARD_AVERMEDIA_M115] = {
@@ -4167,6 +4163,7 @@ struct saa7134_board saa7134_boards[] = {
 		.radio_type     = UNSET,
 		.tuner_addr	= ADDR_UNSET,
 		.radio_addr	= ADDR_UNSET,
+		.mpeg           = SAA7134_MPEG_DVB,
 		.inputs         = {{
 			.name = name_tv,
 			.vmux = 1,
@@ -5351,22 +5348,21 @@ static int saa7134_xc2028_callback(struct saa7134_dev *dev,
 {
 	switch (command) {
 	case XC2028_TUNER_RESET:
-		saa_andorl(SAA7134_GPIO_GPMODE0 >> 2, 0x06e20000, 0x06e20000);
-		saa_andorl(SAA7134_GPIO_GPSTATUS0 >> 2, 0x06a20000, 0x06a20000);
-		mdelay(250);
-		saa_andorl(SAA7134_GPIO_GPMODE0 >> 2, 0x06e20000, 0);
-		saa_andorl(SAA7134_GPIO_GPSTATUS0 >> 2, 0x06a20000, 0);
-		mdelay(250);
-		saa_andorl(SAA7134_GPIO_GPMODE0 >> 2, 0x06e20000, 0x06e20000);
-		saa_andorl(SAA7134_GPIO_GPSTATUS0 >> 2, 0x06a20000, 0x06a20000);
-		mdelay(250);
-		saa_andorl(SAA7133_ANALOG_IO_SELECT >> 2, 0x02, 0x02);
-		saa_andorl(SAA7134_ANALOG_IN_CTRL1 >> 2, 0x81, 0x81);
-		saa_andorl(SAA7134_AUDIO_CLOCK0 >> 2, 0x03187de7, 0x03187de7);
-		saa_andorl(SAA7134_AUDIO_PLL_CTRL >> 2, 0x03, 0x03);
-		saa_andorl(SAA7134_AUDIO_CLOCKS_PER_FIELD0 >> 2,
-			   0x0001e000, 0x0001e000);
-		return 0;
+		saa_andorl(SAA7134_GPIO_GPSTATUS0 >> 2, 0x00008000, 0x00000000);
+		saa_andorl(SAA7134_GPIO_GPSTATUS0 >> 2, 0x00008000, 0x00008000);
+		switch (dev->board) {
+		case SAA7134_BOARD_AVERMEDIA_CARDBUS_506:
+			saa7134_set_gpio(dev, 23, 0);
+			msleep(10);
+			saa7134_set_gpio(dev, 23, 1);
+		break;
+		case SAA7134_BOARD_AVERMEDIA_A16D:
+			saa7134_set_gpio(dev, 21, 0);
+			msleep(10);
+			saa7134_set_gpio(dev, 21, 1);
+		break;
+		}
+	return 0;
 	}
 	return -EINVAL;
 }
@@ -5553,9 +5549,7 @@ int saa7134_board_init1(struct saa7134_dev *dev)
 		saa_andorl(SAA7134_GPIO_GPSTATUS0 >> 2, 0x08000000, 0x00000000);
 		break;
 	case SAA7134_BOARD_AVERMEDIA_CARDBUS:
-	case SAA7134_BOARD_AVERMEDIA_CARDBUS_506:
 	case SAA7134_BOARD_AVERMEDIA_M115:
-	case SAA7134_BOARD_AVERMEDIA_A16D:
 		/* power-down tuner chip */
 		saa_andorl(SAA7134_GPIO_GPMODE0 >> 2,   0xffffffff, 0);
 		saa_andorl(SAA7134_GPIO_GPSTATUS0 >> 2, 0xffffffff, 0);
@@ -5565,6 +5559,18 @@ int saa7134_board_init1(struct saa7134_dev *dev)
 		saa_andorl(SAA7134_GPIO_GPSTATUS0 >> 2, 0xffffffff, 0xffffffff);
 		msleep(10);
 		break;
+	case SAA7134_BOARD_AVERMEDIA_CARDBUS_506:
+		saa7134_set_gpio(dev, 23, 0);
+		msleep(10);
+		saa7134_set_gpio(dev, 23, 1);
+		break;
+	case SAA7134_BOARD_AVERMEDIA_A16D:
+		saa7134_set_gpio(dev, 21, 0);
+		msleep(10);
+		saa7134_set_gpio(dev, 21, 1);
+		msleep(1);
+		dev->has_remote = SAA7134_REMOTE_GPIO;
+		break;
 	case SAA7134_BOARD_BEHOLD_COLUMBUS_TVFM:
 		/* power-down tuner chip */
 		saa_andorl(SAA7134_GPIO_GPMODE0 >> 2,   0x000A8004, 0x000A8004);
@@ -5615,7 +5621,8 @@ int saa7134_board_init1(struct saa7134_dev *dev)
 		saa_andorl(SAA7134_GPIO_GPMODE0 >> 2,   0x80040100, 0x80040100);
 		saa_andorl(SAA7134_GPIO_GPSTATUS0 >> 2, 0x80040100, 0x00040100);
 		printk("%s: %s: hybrid analog/dvb card\n"
-		       "%s: Sorry, only the analog inputs are supported for now.\n",
+		       "%s: Sorry, only analog s-video and composite input "
+		       "are supported for now.\n",
 			dev->name, card(dev).name, dev->name);
 		break;
 	}
@@ -5675,6 +5682,7 @@ static void saa7134_tuner_setup(struct saa7134_dev *dev)
 
 		switch (dev->board) {
 		case SAA7134_BOARD_AVERMEDIA_A16D:
+		case SAA7134_BOARD_AVERMEDIA_CARDBUS_506:
 			ctl.demod = XC3028_FE_ZARLINK456;
 			break;
 		default:
diff --git a/drivers/media/video/saa7134/saa7134-dvb.c b/drivers/media/video/saa7134/saa7134-dvb.c
index 469f93aac00..341b101b035 100644
--- a/drivers/media/video/saa7134/saa7134-dvb.c
+++ b/drivers/media/video/saa7134/saa7134-dvb.c
@@ -153,12 +153,12 @@ static int mt352_aver777_init(struct dvb_frontend* fe)
 	return 0;
 }
 
-static int mt352_aver_a16d_init(struct dvb_frontend *fe)
+static int mt352_avermedia_xc3028_init(struct dvb_frontend *fe)
 {
-	static u8 clock_config []  = { CLOCK_CTL,  0x38, 0x2d };
-	static u8 reset []         = { RESET,      0x80 };
-	static u8 adc_ctl_1_cfg [] = { ADC_CTL_1,  0x40 };
-	static u8 agc_cfg []       = { AGC_TARGET, 0x28, 0xa0 };
+	static u8 clock_config []  = { CLOCK_CTL, 0x38, 0x2d };
+	static u8 reset []         = { RESET, 0x80 };
+	static u8 adc_ctl_1_cfg [] = { ADC_CTL_1, 0x40 };
+	static u8 agc_cfg []       = { AGC_TARGET, 0xe };
 	static u8 capt_range_cfg[] = { CAPT_RANGE, 0x33 };
 
 	mt352_write(fe, clock_config,   sizeof(clock_config));
@@ -167,12 +167,9 @@ static int mt352_aver_a16d_init(struct dvb_frontend *fe)
 	mt352_write(fe, adc_ctl_1_cfg,  sizeof(adc_ctl_1_cfg));
 	mt352_write(fe, agc_cfg,        sizeof(agc_cfg));
 	mt352_write(fe, capt_range_cfg, sizeof(capt_range_cfg));
-
 	return 0;
 }
 
-
-
 static int mt352_pinnacle_tuner_set_params(struct dvb_frontend* fe,
 					   struct dvb_frontend_parameters* params)
 {
@@ -215,14 +212,10 @@ static struct mt352_config avermedia_777 = {
 	.demod_init    = mt352_aver777_init,
 };
 
-static struct mt352_config avermedia_16d = {
-	.demod_address = 0xf,
-	.demod_init    = mt352_aver_a16d_init,
-};
-
-static struct mt352_config avermedia_e506r_mt352_dev = {
+static struct mt352_config avermedia_xc3028_mt352_dev = {
 	.demod_address   = (0x1e >> 1),
 	.no_tuner        = 1,
+	.demod_init      = mt352_avermedia_xc3028_init,
 };
 
 /* ==================================================================
@@ -975,9 +968,10 @@ static int dvb_init(struct saa7134_dev *dev)
 		}
 		break;
 	case SAA7134_BOARD_AVERMEDIA_A16D:
-		dprintk("avertv A16D dvb setup\n");
-		dev->dvb.frontend = dvb_attach(mt352_attach, &avermedia_16d,
-					       &dev->i2c_adap);
+		dprintk("AverMedia A16D dvb setup\n");
+		dev->dvb.frontend = dvb_attach(mt352_attach,
+						&avermedia_xc3028_mt352_dev,
+						&dev->i2c_adap);
 		attach_xc3028 = 1;
 		break;
 	case SAA7134_BOARD_MD7134:
@@ -1091,7 +1085,8 @@ static int dvb_init(struct saa7134_dev *dev)
 					ads_tech_duo_config.tuner_address);
 				goto dettach_frontend;
 			}
-		}
+		} else
+			wprintk("failed to attach tda10046\n");
 		break;
 	case SAA7134_BOARD_TEVION_DVBT_220RF:
 		if (configure_tda827x_fe(dev, &tevion_dvbt220rf_config,
@@ -1260,11 +1255,14 @@ static int dvb_init(struct saa7134_dev *dev)
 			goto dettach_frontend;
 		break;
 	case SAA7134_BOARD_AVERMEDIA_CARDBUS_506:
+		dprintk("AverMedia E506R dvb setup\n");
+		saa7134_set_gpio(dev, 25, 0);
+		msleep(10);
+		saa7134_set_gpio(dev, 25, 1);
 		dev->dvb.frontend = dvb_attach(mt352_attach,
-					       &avermedia_e506r_mt352_dev,
-					       &dev->i2c_adap);
+						&avermedia_xc3028_mt352_dev,
+						&dev->i2c_adap);
 		attach_xc3028 = 1;
-		break;
 	case SAA7134_BOARD_MD7134_BRIDGE_2:
 		dev->dvb.frontend = dvb_attach(tda10086_attach,
 						&sd1878_4m, &dev->i2c_adap);
@@ -1338,7 +1336,8 @@ static int dvb_init(struct saa7134_dev *dev)
 	return ret;
 
 dettach_frontend:
-	dvb_frontend_detach(dev->dvb.frontend);
+	if (dev->dvb.frontend)
+		dvb_frontend_detach(dev->dvb.frontend);
 	dev->dvb.frontend = NULL;
 
 	return -1;
diff --git a/drivers/media/video/saa7134/saa7134-empress.c b/drivers/media/video/saa7134/saa7134-empress.c
index 81431ee4184..3ae71a34082 100644
--- a/drivers/media/video/saa7134/saa7134-empress.c
+++ b/drivers/media/video/saa7134/saa7134-empress.c
@@ -110,9 +110,10 @@ static int ts_release(struct inode *inode, struct file *file)
 {
 	struct saa7134_dev *dev = file->private_data;
 
+	mutex_lock(&dev->empress_tsq.vb_lock);
+
 	videobuf_stop(&dev->empress_tsq);
 	videobuf_mmap_free(&dev->empress_tsq);
-	dev->empress_users--;
 
 	/* stop the encoder */
 	ts_reset_encoder(dev);
@@ -121,6 +122,10 @@ static int ts_release(struct inode *inode, struct file *file)
 	saa_writeb(SAA7134_AUDIO_MUTE_CTRL,
 		saa_readb(SAA7134_AUDIO_MUTE_CTRL) | (1 << 6));
 
+	dev->empress_users--;
+
+	mutex_unlock(&dev->empress_tsq.vb_lock);
+
 	return 0;
 }
 
@@ -218,8 +223,7 @@ static int empress_enum_fmt_cap(struct file *file, void  *priv,
 static int empress_g_fmt_cap(struct file *file, void *priv,
 				struct v4l2_format *f)
 {
-	struct saa7134_fh *fh = priv;
-	struct saa7134_dev *dev = fh->dev;
+	struct saa7134_dev *dev = file->private_data;
 
 	saa7134_i2c_call_clients(dev, VIDIOC_G_FMT, f);
 
@@ -232,8 +236,7 @@ static int empress_g_fmt_cap(struct file *file, void *priv,
 static int empress_s_fmt_cap(struct file *file, void *priv,
 				struct v4l2_format *f)
 {
-	struct saa7134_fh *fh = priv;
-	struct saa7134_dev *dev = fh->dev;
+	struct saa7134_dev *dev = file->private_data;
 
 	saa7134_i2c_call_clients(dev, VIDIOC_S_FMT, f);
 
@@ -247,8 +250,7 @@ static int empress_s_fmt_cap(struct file *file, void *priv,
 static int empress_reqbufs(struct file *file, void *priv,
 					struct v4l2_requestbuffers *p)
 {
-	struct saa7134_fh *fh = priv;
-	struct saa7134_dev *dev = fh->dev;
+	struct saa7134_dev *dev = file->private_data;
 
 	return videobuf_reqbufs(&dev->empress_tsq, p);
 }
@@ -256,24 +258,21 @@ static int empress_reqbufs(struct file *file, void *priv,
 static int empress_querybuf(struct file *file, void *priv,
 					struct v4l2_buffer *b)
 {
-	struct saa7134_fh *fh = priv;
-	struct saa7134_dev *dev = fh->dev;
+	struct saa7134_dev *dev = file->private_data;
 
 	return videobuf_querybuf(&dev->empress_tsq, b);
 }
 
 static int empress_qbuf(struct file *file, void *priv, struct v4l2_buffer *b)
 {
-	struct saa7134_fh *fh = priv;
-	struct saa7134_dev *dev = fh->dev;
+	struct saa7134_dev *dev = file->private_data;
 
 	return videobuf_qbuf(&dev->empress_tsq, b);
 }
 
 static int empress_dqbuf(struct file *file, void *priv, struct v4l2_buffer *b)
 {
-	struct saa7134_fh *fh = priv;
-	struct saa7134_dev *dev = fh->dev;
+	struct saa7134_dev *dev = file->private_data;
 
 	return videobuf_dqbuf(&dev->empress_tsq, b,
 				file->f_flags & O_NONBLOCK);
@@ -282,8 +281,7 @@ static int empress_dqbuf(struct file *file, void *priv, struct v4l2_buffer *b)
 static int empress_streamon(struct file *file, void *priv,
 					enum v4l2_buf_type type)
 {
-	struct saa7134_fh *fh = priv;
-	struct saa7134_dev *dev = fh->dev;
+	struct saa7134_dev *dev = file->private_data;
 
 	return videobuf_streamon(&dev->empress_tsq);
 }
@@ -291,8 +289,7 @@ static int empress_streamon(struct file *file, void *priv,
 static int empress_streamoff(struct file *file, void *priv,
 					enum v4l2_buf_type type)
 {
-	struct saa7134_fh *fh = priv;
-	struct saa7134_dev *dev = fh->dev;
+	struct saa7134_dev *dev = file->private_data;
 
 	return videobuf_streamoff(&dev->empress_tsq);
 }
@@ -300,8 +297,7 @@ static int empress_streamoff(struct file *file, void *priv,
 static int empress_s_ext_ctrls(struct file *file, void *priv,
 			       struct v4l2_ext_controls *ctrls)
 {
-	struct saa7134_fh *fh = priv;
-	struct saa7134_dev *dev = fh->dev;
+	struct saa7134_dev *dev = file->private_data;
 
 	/* count == 0 is abused in saa6752hs.c, so that special
 		case is handled here explicitly. */
@@ -320,8 +316,7 @@ static int empress_s_ext_ctrls(struct file *file, void *priv,
 static int empress_g_ext_ctrls(struct file *file, void *priv,
 			       struct v4l2_ext_controls *ctrls)
 {
-	struct saa7134_fh *fh = priv;
-	struct saa7134_dev *dev = fh->dev;
+	struct saa7134_dev *dev = file->private_data;
 
 	if (ctrls->ctrl_class != V4L2_CTRL_CLASS_MPEG)
 		return -EINVAL;
diff --git a/drivers/media/video/saa7134/saa7134-input.c b/drivers/media/video/saa7134/saa7134-input.c
index 919632b10aa..76e6501d238 100644
--- a/drivers/media/video/saa7134/saa7134-input.c
+++ b/drivers/media/video/saa7134/saa7134-input.c
@@ -323,6 +323,15 @@ int saa7134_input_init1(struct saa7134_dev *dev)
 		saa_setb(SAA7134_GPIO_GPMODE1, 0x1);
 		saa_setb(SAA7134_GPIO_GPSTATUS1, 0x1);
 		break;
+	case SAA7134_BOARD_AVERMEDIA_A16D:
+		ir_codes     = ir_codes_avermedia_a16d;
+		mask_keycode = 0x02F200;
+		mask_keydown = 0x000400;
+		polling      = 50; /* ms */
+		/* Without this we won't receive key up events */
+		saa_setb(SAA7134_GPIO_GPMODE1, 0x1);
+		saa_setb(SAA7134_GPIO_GPSTATUS1, 0x1);
+		break;
 	case SAA7134_BOARD_KWORLD_TERMINATOR:
 		ir_codes     = ir_codes_pixelview;
 		mask_keycode = 0x00001f;
diff --git a/drivers/media/video/soc_camera.c b/drivers/media/video/soc_camera.c
index a1b92446c8b..d015bfe0095 100644
--- a/drivers/media/video/soc_camera.c
+++ b/drivers/media/video/soc_camera.c
@@ -763,15 +763,6 @@ static struct device_driver ic_drv = {
 	.owner	= THIS_MODULE,
 };
 
-/*
- * Image capture host - this is a host device, not a bus device, so,
- * no bus reference, no probing.
- */
-static struct class soc_camera_host_class = {
-	.owner		= THIS_MODULE,
-	.name		= "camera_host",
-};
-
 static void dummy_release(struct device *dev)
 {
 }
@@ -801,7 +792,6 @@ int soc_camera_host_register(struct soc_camera_host *ici)
 
 	/* Number might be equal to the platform device ID */
 	sprintf(ici->dev.bus_id, "camera_host%d", ici->nr);
-	ici->dev.class = &soc_camera_host_class;
 
 	mutex_lock(&list_lock);
 	list_for_each_entry(ix, &hosts, list) {
@@ -1003,14 +993,9 @@ static int __init soc_camera_init(void)
 	ret = driver_register(&ic_drv);
 	if (ret)
 		goto edrvr;
-	ret = class_register(&soc_camera_host_class);
-	if (ret)
-		goto eclr;
 
 	return 0;
 
-eclr:
-	driver_unregister(&ic_drv);
 edrvr:
 	bus_unregister(&soc_camera_bus_type);
 	return ret;
@@ -1018,7 +1003,6 @@ edrvr:
 
 static void __exit soc_camera_exit(void)
 {
-	class_unregister(&soc_camera_host_class);
 	driver_unregister(&ic_drv);
 	bus_unregister(&soc_camera_bus_type);
 }
diff --git a/drivers/media/video/uvc/Makefile b/drivers/media/video/uvc/Makefile
new file mode 100644
index 00000000000..968c1994eda
--- /dev/null
+++ b/drivers/media/video/uvc/Makefile
@@ -0,0 +1,3 @@
+uvcvideo-objs  := uvc_driver.o uvc_queue.o uvc_v4l2.o uvc_video.o uvc_ctrl.o \
+		  uvc_status.o uvc_isight.o
+obj-$(CONFIG_USB_VIDEO_CLASS) += uvcvideo.o
diff --git a/drivers/media/video/uvc/uvc_ctrl.c b/drivers/media/video/uvc/uvc_ctrl.c
new file mode 100644
index 00000000000..f0ee46d1554
--- /dev/null
+++ b/drivers/media/video/uvc/uvc_ctrl.c
@@ -0,0 +1,1256 @@
+/*
+ *      uvc_ctrl.c  --  USB Video Class driver - Controls
+ *
+ *      Copyright (C) 2005-2008
+ *          Laurent Pinchart (laurent.pinchart@skynet.be)
+ *
+ *      This program is free software; you can redistribute it and/or modify
+ *      it under the terms of the GNU General Public License as published by
+ *      the Free Software Foundation; either version 2 of the License, or
+ *      (at your option) any later version.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/version.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/uaccess.h>
+#include <linux/usb.h>
+#include <linux/videodev2.h>
+#include <linux/vmalloc.h>
+#include <linux/wait.h>
+#include <asm/atomic.h>
+
+#include "uvcvideo.h"
+
+#define UVC_CTRL_NDATA		2
+#define UVC_CTRL_DATA_CURRENT	0
+#define UVC_CTRL_DATA_BACKUP	1
+
+/* ------------------------------------------------------------------------
+ * Control, formats, ...
+ */
+
+static struct uvc_control_info uvc_ctrls[] = {
+	{
+		.entity		= UVC_GUID_UVC_PROCESSING,
+		.selector	= PU_BRIGHTNESS_CONTROL,
+		.index		= 0,
+		.size		= 2,
+		.flags		= UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
+				| UVC_CONTROL_RESTORE,
+	},
+	{
+		.entity		= UVC_GUID_UVC_PROCESSING,
+		.selector	= PU_CONTRAST_CONTROL,
+		.index		= 1,
+		.size		= 2,
+		.flags		= UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
+				| UVC_CONTROL_RESTORE,
+	},
+	{
+		.entity		= UVC_GUID_UVC_PROCESSING,
+		.selector	= PU_HUE_CONTROL,
+		.index		= 2,
+		.size		= 2,
+		.flags		= UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
+				| UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
+	},
+	{
+		.entity		= UVC_GUID_UVC_PROCESSING,
+		.selector	= PU_SATURATION_CONTROL,
+		.index		= 3,
+		.size		= 2,
+		.flags		= UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
+				| UVC_CONTROL_RESTORE,
+	},
+	{
+		.entity		= UVC_GUID_UVC_PROCESSING,
+		.selector	= PU_SHARPNESS_CONTROL,
+		.index		= 4,
+		.size		= 2,
+		.flags		= UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
+				| UVC_CONTROL_RESTORE,
+	},
+	{
+		.entity		= UVC_GUID_UVC_PROCESSING,
+		.selector	= PU_GAMMA_CONTROL,
+		.index		= 5,
+		.size		= 2,
+		.flags		= UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
+				| UVC_CONTROL_RESTORE,
+	},
+	{
+		.entity		= UVC_GUID_UVC_PROCESSING,
+		.selector	= PU_BACKLIGHT_COMPENSATION_CONTROL,
+		.index		= 8,
+		.size		= 2,
+		.flags		= UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
+				| UVC_CONTROL_RESTORE,
+	},
+	{
+		.entity		= UVC_GUID_UVC_PROCESSING,
+		.selector	= PU_GAIN_CONTROL,
+		.index		= 9,
+		.size		= 2,
+		.flags		= UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
+				| UVC_CONTROL_RESTORE,
+	},
+	{
+		.entity		= UVC_GUID_UVC_PROCESSING,
+		.selector	= PU_POWER_LINE_FREQUENCY_CONTROL,
+		.index		= 10,
+		.size		= 1,
+		.flags		= UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
+				| UVC_CONTROL_RESTORE,
+	},
+	{
+		.entity		= UVC_GUID_UVC_PROCESSING,
+		.selector	= PU_HUE_AUTO_CONTROL,
+		.index		= 11,
+		.size		= 1,
+		.flags		= UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
+				| UVC_CONTROL_GET_DEF | UVC_CONTROL_RESTORE,
+	},
+	{
+		.entity		= UVC_GUID_UVC_CAMERA,
+		.selector	= CT_AE_MODE_CONTROL,
+		.index		= 1,
+		.size		= 1,
+		.flags		= UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
+				| UVC_CONTROL_GET_DEF | UVC_CONTROL_GET_RES
+				| UVC_CONTROL_RESTORE,
+	},
+	{
+		.entity		= UVC_GUID_UVC_CAMERA,
+		.selector	= CT_AE_PRIORITY_CONTROL,
+		.index		= 2,
+		.size		= 1,
+		.flags		= UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
+				| UVC_CONTROL_RESTORE,
+	},
+	{
+		.entity		= UVC_GUID_UVC_CAMERA,
+		.selector	= CT_EXPOSURE_TIME_ABSOLUTE_CONTROL,
+		.index		= 3,
+		.size		= 4,
+		.flags		= UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
+				| UVC_CONTROL_RESTORE,
+	},
+	{
+		.entity		= UVC_GUID_UVC_CAMERA,
+		.selector	= CT_FOCUS_ABSOLUTE_CONTROL,
+		.index		= 5,
+		.size		= 2,
+		.flags		= UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
+				| UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
+	},
+	{
+		.entity		= UVC_GUID_UVC_CAMERA,
+		.selector	= CT_FOCUS_AUTO_CONTROL,
+		.index		= 17,
+		.size		= 1,
+		.flags		= UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
+				| UVC_CONTROL_GET_DEF | UVC_CONTROL_RESTORE,
+	},
+	{
+		.entity		= UVC_GUID_UVC_PROCESSING,
+		.selector	= PU_WHITE_BALANCE_TEMPERATURE_AUTO_CONTROL,
+		.index		= 12,
+		.size		= 1,
+		.flags		= UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
+				| UVC_CONTROL_GET_DEF | UVC_CONTROL_RESTORE,
+	},
+	{
+		.entity		= UVC_GUID_UVC_PROCESSING,
+		.selector	= PU_WHITE_BALANCE_TEMPERATURE_CONTROL,
+		.index		= 6,
+		.size		= 2,
+		.flags		= UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
+				| UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
+	},
+	{
+		.entity		= UVC_GUID_UVC_PROCESSING,
+		.selector	= PU_WHITE_BALANCE_COMPONENT_AUTO_CONTROL,
+		.index		= 13,
+		.size		= 1,
+		.flags		= UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
+				| UVC_CONTROL_GET_DEF | UVC_CONTROL_RESTORE,
+	},
+	{
+		.entity		= UVC_GUID_UVC_PROCESSING,
+		.selector	= PU_WHITE_BALANCE_COMPONENT_CONTROL,
+		.index		= 7,
+		.size		= 4,
+		.flags		= UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
+				| UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
+	},
+};
+
+static struct uvc_menu_info power_line_frequency_controls[] = {
+	{ 0, "Disabled" },
+	{ 1, "50 Hz" },
+	{ 2, "60 Hz" },
+};
+
+static struct uvc_menu_info exposure_auto_controls[] = {
+	{ 1, "Manual Mode" },
+	{ 2, "Auto Mode" },
+	{ 4, "Shutter Priority Mode" },
+	{ 8, "Aperture Priority Mode" },
+};
+
+static struct uvc_control_mapping uvc_ctrl_mappings[] = {
+	{
+		.id		= V4L2_CID_BRIGHTNESS,
+		.name		= "Brightness",
+		.entity		= UVC_GUID_UVC_PROCESSING,
+		.selector	= PU_BRIGHTNESS_CONTROL,
+		.size		= 16,
+		.offset		= 0,
+		.v4l2_type	= V4L2_CTRL_TYPE_INTEGER,
+		.data_type	= UVC_CTRL_DATA_TYPE_SIGNED,
+	},
+	{
+		.id		= V4L2_CID_CONTRAST,
+		.name		= "Contrast",
+		.entity		= UVC_GUID_UVC_PROCESSING,
+		.selector	= PU_CONTRAST_CONTROL,
+		.size		= 16,
+		.offset		= 0,
+		.v4l2_type	= V4L2_CTRL_TYPE_INTEGER,
+		.data_type	= UVC_CTRL_DATA_TYPE_UNSIGNED,
+	},
+	{
+		.id		= V4L2_CID_HUE,
+		.name		= "Hue",
+		.entity		= UVC_GUID_UVC_PROCESSING,
+		.selector	= PU_HUE_CONTROL,
+		.size		= 16,
+		.offset		= 0,
+		.v4l2_type	= V4L2_CTRL_TYPE_INTEGER,
+		.data_type	= UVC_CTRL_DATA_TYPE_SIGNED,
+	},
+	{
+		.id		= V4L2_CID_SATURATION,
+		.name		= "Saturation",
+		.entity		= UVC_GUID_UVC_PROCESSING,
+		.selector	= PU_SATURATION_CONTROL,
+		.size		= 16,
+		.offset		= 0,
+		.v4l2_type	= V4L2_CTRL_TYPE_INTEGER,
+		.data_type	= UVC_CTRL_DATA_TYPE_UNSIGNED,
+	},
+	{
+		.id		= V4L2_CID_SHARPNESS,
+		.name		= "Sharpness",
+		.entity		= UVC_GUID_UVC_PROCESSING,
+		.selector	= PU_SHARPNESS_CONTROL,
+		.size		= 16,
+		.offset		= 0,
+		.v4l2_type	= V4L2_CTRL_TYPE_INTEGER,
+		.data_type	= UVC_CTRL_DATA_TYPE_UNSIGNED,
+	},
+	{
+		.id		= V4L2_CID_GAMMA,
+		.name		= "Gamma",
+		.entity		= UVC_GUID_UVC_PROCESSING,
+		.selector	= PU_GAMMA_CONTROL,
+		.size		= 16,
+		.offset		= 0,
+		.v4l2_type	= V4L2_CTRL_TYPE_INTEGER,
+		.data_type	= UVC_CTRL_DATA_TYPE_UNSIGNED,
+	},
+	{
+		.id		= V4L2_CID_BACKLIGHT_COMPENSATION,
+		.name		= "Backlight Compensation",
+		.entity		= UVC_GUID_UVC_PROCESSING,
+		.selector	= PU_BACKLIGHT_COMPENSATION_CONTROL,
+		.size		= 16,
+		.offset		= 0,
+		.v4l2_type	= V4L2_CTRL_TYPE_INTEGER,
+		.data_type	= UVC_CTRL_DATA_TYPE_UNSIGNED,
+	},
+	{
+		.id		= V4L2_CID_GAIN,
+		.name		= "Gain",
+		.entity		= UVC_GUID_UVC_PROCESSING,
+		.selector	= PU_GAIN_CONTROL,
+		.size		= 16,
+		.offset		= 0,
+		.v4l2_type	= V4L2_CTRL_TYPE_INTEGER,
+		.data_type	= UVC_CTRL_DATA_TYPE_UNSIGNED,
+	},
+	{
+		.id		= V4L2_CID_POWER_LINE_FREQUENCY,
+		.name		= "Power Line Frequency",
+		.entity		= UVC_GUID_UVC_PROCESSING,
+		.selector	= PU_POWER_LINE_FREQUENCY_CONTROL,
+		.size		= 2,
+		.offset		= 0,
+		.v4l2_type	= V4L2_CTRL_TYPE_MENU,
+		.data_type	= UVC_CTRL_DATA_TYPE_ENUM,
+		.menu_info	= power_line_frequency_controls,
+		.menu_count	= ARRAY_SIZE(power_line_frequency_controls),
+	},
+	{
+		.id		= V4L2_CID_HUE_AUTO,
+		.name		= "Hue, Auto",
+		.entity		= UVC_GUID_UVC_PROCESSING,
+		.selector	= PU_HUE_AUTO_CONTROL,
+		.size		= 1,
+		.offset		= 0,
+		.v4l2_type	= V4L2_CTRL_TYPE_BOOLEAN,
+		.data_type	= UVC_CTRL_DATA_TYPE_BOOLEAN,
+	},
+	{
+		.id		= V4L2_CID_EXPOSURE_AUTO,
+		.name		= "Exposure, Auto",
+		.entity		= UVC_GUID_UVC_CAMERA,
+		.selector	= CT_AE_MODE_CONTROL,
+		.size		= 4,
+		.offset		= 0,
+		.v4l2_type	= V4L2_CTRL_TYPE_MENU,
+		.data_type	= UVC_CTRL_DATA_TYPE_BITMASK,
+		.menu_info	= exposure_auto_controls,
+		.menu_count	= ARRAY_SIZE(exposure_auto_controls),
+	},
+	{
+		.id		= V4L2_CID_EXPOSURE_AUTO_PRIORITY,
+		.name		= "Exposure, Auto Priority",
+		.entity		= UVC_GUID_UVC_CAMERA,
+		.selector	= CT_AE_PRIORITY_CONTROL,
+		.size		= 1,
+		.offset		= 0,
+		.v4l2_type	= V4L2_CTRL_TYPE_BOOLEAN,
+		.data_type	= UVC_CTRL_DATA_TYPE_BOOLEAN,
+	},
+	{
+		.id		= V4L2_CID_EXPOSURE_ABSOLUTE,
+		.name		= "Exposure (Absolute)",
+		.entity		= UVC_GUID_UVC_CAMERA,
+		.selector	= CT_EXPOSURE_TIME_ABSOLUTE_CONTROL,
+		.size		= 32,
+		.offset		= 0,
+		.v4l2_type	= V4L2_CTRL_TYPE_INTEGER,
+		.data_type	= UVC_CTRL_DATA_TYPE_UNSIGNED,
+	},
+	{
+		.id		= V4L2_CID_AUTO_WHITE_BALANCE,
+		.name		= "White Balance Temperature, Auto",
+		.entity		= UVC_GUID_UVC_PROCESSING,
+		.selector	= PU_WHITE_BALANCE_TEMPERATURE_AUTO_CONTROL,
+		.size		= 1,
+		.offset		= 0,
+		.v4l2_type	= V4L2_CTRL_TYPE_BOOLEAN,
+		.data_type	= UVC_CTRL_DATA_TYPE_BOOLEAN,
+	},
+	{
+		.id		= V4L2_CID_WHITE_BALANCE_TEMPERATURE,
+		.name		= "White Balance Temperature",
+		.entity		= UVC_GUID_UVC_PROCESSING,
+		.selector	= PU_WHITE_BALANCE_TEMPERATURE_CONTROL,
+		.size		= 16,
+		.offset		= 0,
+		.v4l2_type	= V4L2_CTRL_TYPE_INTEGER,
+		.data_type	= UVC_CTRL_DATA_TYPE_UNSIGNED,
+	},
+	{
+		.id		= V4L2_CID_AUTO_WHITE_BALANCE,
+		.name		= "White Balance Component, Auto",
+		.entity		= UVC_GUID_UVC_PROCESSING,
+		.selector	= PU_WHITE_BALANCE_COMPONENT_AUTO_CONTROL,
+		.size		= 1,
+		.offset		= 0,
+		.v4l2_type	= V4L2_CTRL_TYPE_BOOLEAN,
+		.data_type	= UVC_CTRL_DATA_TYPE_BOOLEAN,
+	},
+	{
+		.id		= V4L2_CID_BLUE_BALANCE,
+		.name		= "White Balance Blue Component",
+		.entity		= UVC_GUID_UVC_PROCESSING,
+		.selector	= PU_WHITE_BALANCE_COMPONENT_CONTROL,
+		.size		= 16,
+		.offset		= 0,
+		.v4l2_type	= V4L2_CTRL_TYPE_INTEGER,
+		.data_type	= UVC_CTRL_DATA_TYPE_SIGNED,
+	},
+	{
+		.id		= V4L2_CID_RED_BALANCE,
+		.name		= "White Balance Red Component",
+		.entity		= UVC_GUID_UVC_PROCESSING,
+		.selector	= PU_WHITE_BALANCE_COMPONENT_CONTROL,
+		.size		= 16,
+		.offset		= 16,
+		.v4l2_type	= V4L2_CTRL_TYPE_INTEGER,
+		.data_type	= UVC_CTRL_DATA_TYPE_SIGNED,
+	},
+	{
+		.id		= V4L2_CID_FOCUS_ABSOLUTE,
+		.name		= "Focus (absolute)",
+		.entity		= UVC_GUID_UVC_CAMERA,
+		.selector	= CT_FOCUS_ABSOLUTE_CONTROL,
+		.size		= 16,
+		.offset		= 0,
+		.v4l2_type	= V4L2_CTRL_TYPE_INTEGER,
+		.data_type	= UVC_CTRL_DATA_TYPE_UNSIGNED,
+	},
+	{
+		.id		= V4L2_CID_FOCUS_AUTO,
+		.name		= "Focus, Auto",
+		.entity		= UVC_GUID_UVC_CAMERA,
+		.selector	= CT_FOCUS_AUTO_CONTROL,
+		.size		= 1,
+		.offset		= 0,
+		.v4l2_type	= V4L2_CTRL_TYPE_BOOLEAN,
+		.data_type	= UVC_CTRL_DATA_TYPE_BOOLEAN,
+	},
+};
+
+/* ------------------------------------------------------------------------
+ * Utility functions
+ */
+
+static inline __u8 *uvc_ctrl_data(struct uvc_control *ctrl, int id)
+{
+	return ctrl->data + id * ctrl->info->size;
+}
+
+static inline int uvc_get_bit(const __u8 *data, int bit)
+{
+	return (data[bit >> 3] >> (bit & 7)) & 1;
+}
+
+/* Extract the bit string specified by mapping->offset and mapping->size
+ * from the little-endian data stored at 'data' and return the result as
+ * a signed 32bit integer. Sign extension will be performed if the mapping
+ * references a signed data type.
+ */
+static __s32 uvc_get_le_value(const __u8 *data,
+	struct uvc_control_mapping *mapping)
+{
+	int bits = mapping->size;
+	int offset = mapping->offset;
+	__s32 value = 0;
+	__u8 mask;
+
+	data += offset / 8;
+	offset &= 7;
+	mask = ((1LL << bits) - 1) << offset;
+
+	for (; bits > 0; data++) {
+		__u8 byte = *data & mask;
+		value |= offset > 0 ? (byte >> offset) : (byte << (-offset));
+		bits -= 8 - (offset > 0 ? offset : 0);
+		offset -= 8;
+		mask = (1 << bits) - 1;
+	}
+
+	/* Sign-extend the value if needed */
+	if (mapping->data_type == UVC_CTRL_DATA_TYPE_SIGNED)
+		value |= -(value & (1 << (mapping->size - 1)));
+
+	return value;
+}
+
+/* Set the bit string specified by mapping->offset and mapping->size
+ * in the little-endian data stored at 'data' to the value 'value'.
+ */
+static void uvc_set_le_value(__s32 value, __u8 *data,
+	struct uvc_control_mapping *mapping)
+{
+	int bits = mapping->size;
+	int offset = mapping->offset;
+	__u8 mask;
+
+	data += offset / 8;
+	offset &= 7;
+
+	for (; bits > 0; data++) {
+		mask = ((1LL << bits) - 1) << offset;
+		*data = (*data & ~mask) | ((value << offset) & mask);
+		value >>= offset ? offset : 8;
+		bits -= 8 - offset;
+		offset = 0;
+	}
+}
+
+/* ------------------------------------------------------------------------
+ * Terminal and unit management
+ */
+
+static const __u8 uvc_processing_guid[16] = UVC_GUID_UVC_PROCESSING;
+static const __u8 uvc_camera_guid[16] = UVC_GUID_UVC_CAMERA;
+static const __u8 uvc_media_transport_input_guid[16] =
+	UVC_GUID_UVC_MEDIA_TRANSPORT_INPUT;
+
+static int uvc_entity_match_guid(struct uvc_entity *entity, __u8 guid[16])
+{
+	switch (UVC_ENTITY_TYPE(entity)) {
+	case ITT_CAMERA:
+		return memcmp(uvc_camera_guid, guid, 16) == 0;
+
+	case ITT_MEDIA_TRANSPORT_INPUT:
+		return memcmp(uvc_media_transport_input_guid, guid, 16) == 0;
+
+	case VC_PROCESSING_UNIT:
+		return memcmp(uvc_processing_guid, guid, 16) == 0;
+
+	case VC_EXTENSION_UNIT:
+		return memcmp(entity->extension.guidExtensionCode,
+			      guid, 16) == 0;
+
+	default:
+		return 0;
+	}
+}
+
+/* ------------------------------------------------------------------------
+ * UVC Controls
+ */
+
+static void __uvc_find_control(struct uvc_entity *entity, __u32 v4l2_id,
+	struct uvc_control_mapping **mapping, struct uvc_control **control,
+	int next)
+{
+	struct uvc_control *ctrl;
+	struct uvc_control_mapping *map;
+	unsigned int i;
+
+	if (entity == NULL)
+		return;
+
+	for (i = 0; i < entity->ncontrols; ++i) {
+		ctrl = &entity->controls[i];
+		if (ctrl->info == NULL)
+			continue;
+
+		list_for_each_entry(map, &ctrl->info->mappings, list) {
+			if ((map->id == v4l2_id) && !next) {
+				*control = ctrl;
+				*mapping = map;
+				return;
+			}
+
+			if ((*mapping == NULL || (*mapping)->id > map->id) &&
+			    (map->id > v4l2_id) && next) {
+				*control = ctrl;
+				*mapping = map;
+			}
+		}
+	}
+}
+
+struct uvc_control *uvc_find_control(struct uvc_video_device *video,
+	__u32 v4l2_id, struct uvc_control_mapping **mapping)
+{
+	struct uvc_control *ctrl = NULL;
+	struct uvc_entity *entity;
+	int next = v4l2_id & V4L2_CTRL_FLAG_NEXT_CTRL;
+
+	*mapping = NULL;
+
+	/* Mask the query flags. */
+	v4l2_id &= V4L2_CTRL_ID_MASK;
+
+	/* Find the control. */
+	__uvc_find_control(video->processing, v4l2_id, mapping, &ctrl, next);
+	if (ctrl && !next)
+		return ctrl;
+
+	list_for_each_entry(entity, &video->iterms, chain) {
+		__uvc_find_control(entity, v4l2_id, mapping, &ctrl, next);
+		if (ctrl && !next)
+			return ctrl;
+	}
+
+	list_for_each_entry(entity, &video->extensions, chain) {
+		__uvc_find_control(entity, v4l2_id, mapping, &ctrl, next);
+		if (ctrl && !next)
+			return ctrl;
+	}
+
+	if (ctrl == NULL && !next)
+		uvc_trace(UVC_TRACE_CONTROL, "Control 0x%08x not found.\n",
+				v4l2_id);
+
+	return ctrl;
+}
+
+int uvc_query_v4l2_ctrl(struct uvc_video_device *video,
+	struct v4l2_queryctrl *v4l2_ctrl)
+{
+	struct uvc_control *ctrl;
+	struct uvc_control_mapping *mapping;
+	struct uvc_menu_info *menu;
+	unsigned int i;
+	__u8 data[8];
+	int ret;
+
+	ctrl = uvc_find_control(video, v4l2_ctrl->id, &mapping);
+	if (ctrl == NULL)
+		return -EINVAL;
+
+	v4l2_ctrl->id = mapping->id;
+	v4l2_ctrl->type = mapping->v4l2_type;
+	strncpy(v4l2_ctrl->name, mapping->name, sizeof v4l2_ctrl->name);
+	v4l2_ctrl->flags = 0;
+
+	if (!(ctrl->info->flags & UVC_CONTROL_SET_CUR))
+		v4l2_ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
+
+	if (ctrl->info->flags & UVC_CONTROL_GET_DEF) {
+		if ((ret = uvc_query_ctrl(video->dev, GET_DEF, ctrl->entity->id,
+				video->dev->intfnum, ctrl->info->selector,
+				&data, ctrl->info->size)) < 0)
+			return ret;
+		v4l2_ctrl->default_value = uvc_get_le_value(data, mapping);
+	}
+
+	if (mapping->v4l2_type == V4L2_CTRL_TYPE_MENU) {
+		v4l2_ctrl->minimum = 0;
+		v4l2_ctrl->maximum = mapping->menu_count - 1;
+		v4l2_ctrl->step = 1;
+
+		menu = mapping->menu_info;
+		for (i = 0; i < mapping->menu_count; ++i, ++menu) {
+			if (menu->value == v4l2_ctrl->default_value) {
+				v4l2_ctrl->default_value = i;
+				break;
+			}
+		}
+
+		return 0;
+	}
+
+	if (ctrl->info->flags & UVC_CONTROL_GET_MIN) {
+		if ((ret = uvc_query_ctrl(video->dev, GET_MIN, ctrl->entity->id,
+				video->dev->intfnum, ctrl->info->selector,
+				&data, ctrl->info->size)) < 0)
+			return ret;
+		v4l2_ctrl->minimum = uvc_get_le_value(data, mapping);
+	}
+	if (ctrl->info->flags & UVC_CONTROL_GET_MAX) {
+		if ((ret = uvc_query_ctrl(video->dev, GET_MAX, ctrl->entity->id,
+				video->dev->intfnum, ctrl->info->selector,
+				&data, ctrl->info->size)) < 0)
+			return ret;
+		v4l2_ctrl->maximum = uvc_get_le_value(data, mapping);
+	}
+	if (ctrl->info->flags & UVC_CONTROL_GET_RES) {
+		if ((ret = uvc_query_ctrl(video->dev, GET_RES, ctrl->entity->id,
+				video->dev->intfnum, ctrl->info->selector,
+				&data, ctrl->info->size)) < 0)
+			return ret;
+		v4l2_ctrl->step = uvc_get_le_value(data, mapping);
+	}
+
+	return 0;
+}
+
+
+/* --------------------------------------------------------------------------
+ * Control transactions
+ *
+ * To make extended set operations as atomic as the hardware allows, controls
+ * are handled using begin/commit/rollback operations.
+ *
+ * At the beginning of a set request, uvc_ctrl_begin should be called to
+ * initialize the request. This function acquires the control lock.
+ *
+ * When setting a control, the new value is stored in the control data field
+ * at position UVC_CTRL_DATA_CURRENT. The control is then marked as dirty for
+ * later processing. If the UVC and V4L2 control sizes differ, the current
+ * value is loaded from the hardware before storing the new value in the data
+ * field.
+ *
+ * After processing all controls in the transaction, uvc_ctrl_commit or
+ * uvc_ctrl_rollback must be called to apply the pending changes to the
+ * hardware or revert them. When applying changes, all controls marked as
+ * dirty will be modified in the UVC device, and the dirty flag will be
+ * cleared. When reverting controls, the control data field
+ * UVC_CTRL_DATA_CURRENT is reverted to its previous value
+ * (UVC_CTRL_DATA_BACKUP) for all dirty controls. Both functions release the
+ * control lock.
+ */
+int uvc_ctrl_begin(struct uvc_video_device *video)
+{
+	return mutex_lock_interruptible(&video->ctrl_mutex) ? -ERESTARTSYS : 0;
+}
+
+static int uvc_ctrl_commit_entity(struct uvc_device *dev,
+	struct uvc_entity *entity, int rollback)
+{
+	struct uvc_control *ctrl;
+	unsigned int i;
+	int ret;
+
+	if (entity == NULL)
+		return 0;
+
+	for (i = 0; i < entity->ncontrols; ++i) {
+		ctrl = &entity->controls[i];
+		if (ctrl->info == NULL || !ctrl->dirty)
+			continue;
+
+		if (!rollback)
+			ret = uvc_query_ctrl(dev, SET_CUR, ctrl->entity->id,
+				dev->intfnum, ctrl->info->selector,
+				uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
+				ctrl->info->size);
+		else
+			ret = 0;
+
+		if (rollback || ret < 0)
+			memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
+			       uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
+			       ctrl->info->size);
+
+		if ((ctrl->info->flags & UVC_CONTROL_GET_CUR) == 0)
+			ctrl->loaded = 0;
+
+		ctrl->dirty = 0;
+
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
+int __uvc_ctrl_commit(struct uvc_video_device *video, int rollback)
+{
+	struct uvc_entity *entity;
+	int ret = 0;
+
+	/* Find the control. */
+	ret = uvc_ctrl_commit_entity(video->dev, video->processing, rollback);
+	if (ret < 0)
+		goto done;
+
+	list_for_each_entry(entity, &video->iterms, chain) {
+		ret = uvc_ctrl_commit_entity(video->dev, entity, rollback);
+		if (ret < 0)
+			goto done;
+	}
+
+	list_for_each_entry(entity, &video->extensions, chain) {
+		ret = uvc_ctrl_commit_entity(video->dev, entity, rollback);
+		if (ret < 0)
+			goto done;
+	}
+
+done:
+	mutex_unlock(&video->ctrl_mutex);
+	return ret;
+}
+
+int uvc_ctrl_get(struct uvc_video_device *video,
+	struct v4l2_ext_control *xctrl)
+{
+	struct uvc_control *ctrl;
+	struct uvc_control_mapping *mapping;
+	struct uvc_menu_info *menu;
+	unsigned int i;
+	int ret;
+
+	ctrl = uvc_find_control(video, xctrl->id, &mapping);
+	if (ctrl == NULL || (ctrl->info->flags & UVC_CONTROL_GET_CUR) == 0)
+		return -EINVAL;
+
+	if (!ctrl->loaded) {
+		ret = uvc_query_ctrl(video->dev, GET_CUR, ctrl->entity->id,
+				video->dev->intfnum, ctrl->info->selector,
+				uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
+				ctrl->info->size);
+		if (ret < 0)
+			return ret;
+
+		if ((ctrl->info->flags & UVC_CONTROL_AUTO_UPDATE) == 0)
+			ctrl->loaded = 1;
+	}
+
+	xctrl->value = uvc_get_le_value(
+		uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT), mapping);
+
+	if (mapping->v4l2_type == V4L2_CTRL_TYPE_MENU) {
+		menu = mapping->menu_info;
+		for (i = 0; i < mapping->menu_count; ++i, ++menu) {
+			if (menu->value == xctrl->value) {
+				xctrl->value = i;
+				break;
+			}
+		}
+	}
+
+	return 0;
+}
+
+int uvc_ctrl_set(struct uvc_video_device *video,
+	struct v4l2_ext_control *xctrl)
+{
+	struct uvc_control *ctrl;
+	struct uvc_control_mapping *mapping;
+	s32 value = xctrl->value;
+	int ret;
+
+	ctrl = uvc_find_control(video, xctrl->id, &mapping);
+	if (ctrl == NULL || (ctrl->info->flags & UVC_CONTROL_SET_CUR) == 0)
+		return -EINVAL;
+
+	if (mapping->v4l2_type == V4L2_CTRL_TYPE_MENU) {
+		if (value < 0 || value >= mapping->menu_count)
+			return -EINVAL;
+		value = mapping->menu_info[value].value;
+	}
+
+	if (!ctrl->loaded && (ctrl->info->size * 8) != mapping->size) {
+		if ((ctrl->info->flags & UVC_CONTROL_GET_CUR) == 0) {
+			memset(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
+				0, ctrl->info->size);
+		} else {
+			ret = uvc_query_ctrl(video->dev, GET_CUR,
+				ctrl->entity->id, video->dev->intfnum,
+				ctrl->info->selector,
+				uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
+				ctrl->info->size);
+			if (ret < 0)
+				return ret;
+		}
+
+		if ((ctrl->info->flags & UVC_CONTROL_AUTO_UPDATE) == 0)
+			ctrl->loaded = 1;
+	}
+
+	if (!ctrl->dirty) {
+		memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
+		       uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
+		       ctrl->info->size);
+	}
+
+	uvc_set_le_value(value,
+		uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT), mapping);
+
+	ctrl->dirty = 1;
+	ctrl->modified = 1;
+	return 0;
+}
+
+/* --------------------------------------------------------------------------
+ * Dynamic controls
+ */
+
+int uvc_xu_ctrl_query(struct uvc_video_device *video,
+	struct uvc_xu_control *xctrl, int set)
+{
+	struct uvc_entity *entity;
+	struct uvc_control *ctrl = NULL;
+	unsigned int i, found = 0;
+	__u8 *data;
+	int ret;
+
+	/* Find the extension unit. */
+	list_for_each_entry(entity, &video->extensions, chain) {
+		if (entity->id == xctrl->unit)
+			break;
+	}
+
+	if (entity->id != xctrl->unit) {
+		uvc_trace(UVC_TRACE_CONTROL, "Extension unit %u not found.\n",
+			xctrl->unit);
+		return -EINVAL;
+	}
+
+	/* Find the control. */
+	for (i = 0; i < entity->ncontrols; ++i) {
+		ctrl = &entity->controls[i];
+		if (ctrl->info == NULL)
+			continue;
+
+		if (ctrl->info->selector == xctrl->selector) {
+			found = 1;
+			break;
+		}
+	}
+
+	if (!found) {
+		uvc_trace(UVC_TRACE_CONTROL,
+			"Control " UVC_GUID_FORMAT "/%u not found.\n",
+			UVC_GUID_ARGS(entity->extension.guidExtensionCode),
+			xctrl->selector);
+		return -EINVAL;
+	}
+
+	/* Validate control data size. */
+	if (ctrl->info->size != xctrl->size)
+		return -EINVAL;
+
+	if ((set && !(ctrl->info->flags & UVC_CONTROL_SET_CUR)) ||
+	    (!set && !(ctrl->info->flags & UVC_CONTROL_GET_CUR)))
+		return -EINVAL;
+
+	if (mutex_lock_interruptible(&video->ctrl_mutex))
+		return -ERESTARTSYS;
+
+	memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
+	       uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
+	       xctrl->size);
+	data = uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT);
+
+	if (set && copy_from_user(data, xctrl->data, xctrl->size)) {
+		ret = -EFAULT;
+		goto out;
+	}
+
+	ret = uvc_query_ctrl(video->dev, set ? SET_CUR : GET_CUR, xctrl->unit,
+			     video->dev->intfnum, xctrl->selector, data,
+			     xctrl->size);
+	if (ret < 0)
+		goto out;
+
+	if (!set && copy_to_user(xctrl->data, data, xctrl->size)) {
+		ret = -EFAULT;
+		goto out;
+	}
+
+out:
+	if (ret)
+		memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
+		       uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
+		       xctrl->size);
+
+	mutex_unlock(&video->ctrl_mutex);
+	return ret;
+}
+
+/* --------------------------------------------------------------------------
+ * Suspend/resume
+ */
+
+/*
+ * Restore control values after resume, skipping controls that haven't been
+ * changed.
+ *
+ * TODO
+ * - Don't restore modified controls that are back to their default value.
+ * - Handle restore order (Auto-Exposure Mode should be restored before
+ *   Exposure Time).
+ */
+int uvc_ctrl_resume_device(struct uvc_device *dev)
+{
+	struct uvc_control *ctrl;
+	struct uvc_entity *entity;
+	unsigned int i;
+	int ret;
+
+	/* Walk the entities list and restore controls when possible. */
+	list_for_each_entry(entity, &dev->entities, list) {
+
+		for (i = 0; i < entity->ncontrols; ++i) {
+			ctrl = &entity->controls[i];
+
+			if (ctrl->info == NULL || !ctrl->modified ||
+			    (ctrl->info->flags & UVC_CONTROL_RESTORE) == 0)
+				continue;
+
+			printk(KERN_INFO "restoring control " UVC_GUID_FORMAT
+				"/%u/%u\n", UVC_GUID_ARGS(ctrl->info->entity),
+				ctrl->info->index, ctrl->info->selector);
+			ctrl->dirty = 1;
+		}
+
+		ret = uvc_ctrl_commit_entity(dev, entity, 0);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
+/* --------------------------------------------------------------------------
+ * Control and mapping handling
+ */
+
+static void uvc_ctrl_add_ctrl(struct uvc_device *dev,
+	struct uvc_control_info *info)
+{
+	struct uvc_entity *entity;
+	struct uvc_control *ctrl = NULL;
+	int ret, found = 0;
+	unsigned int i;
+
+	list_for_each_entry(entity, &dev->entities, list) {
+		if (!uvc_entity_match_guid(entity, info->entity))
+			continue;
+
+		for (i = 0; i < entity->ncontrols; ++i) {
+			ctrl = &entity->controls[i];
+			if (ctrl->index == info->index) {
+				found = 1;
+				break;
+			}
+		}
+
+		if (found)
+			break;
+	}
+
+	if (!found)
+		return;
+
+	if (UVC_ENTITY_TYPE(entity) == VC_EXTENSION_UNIT) {
+		/* Check if the device control information and length match
+		 * the user supplied information.
+		 */
+		__u32 flags;
+		__le16 size;
+		__u8 inf;
+
+		if ((ret = uvc_query_ctrl(dev, GET_LEN, ctrl->entity->id,
+			dev->intfnum, info->selector, (__u8 *)&size, 2)) < 0) {
+			uvc_trace(UVC_TRACE_CONTROL, "GET_LEN failed on "
+				"control " UVC_GUID_FORMAT "/%u (%d).\n",
+				UVC_GUID_ARGS(info->entity), info->selector,
+				ret);
+			return;
+		}
+
+		if (info->size != le16_to_cpu(size)) {
+			uvc_trace(UVC_TRACE_CONTROL, "Control " UVC_GUID_FORMAT
+				"/%u size doesn't match user supplied "
+				"value.\n", UVC_GUID_ARGS(info->entity),
+				info->selector);
+			return;
+		}
+
+		if ((ret = uvc_query_ctrl(dev, GET_INFO, ctrl->entity->id,
+			dev->intfnum, info->selector, &inf, 1)) < 0) {
+			uvc_trace(UVC_TRACE_CONTROL, "GET_INFO failed on "
+				"control " UVC_GUID_FORMAT "/%u (%d).\n",
+				UVC_GUID_ARGS(info->entity), info->selector,
+				ret);
+			return;
+		}
+
+		flags = info->flags;
+		if (((flags & UVC_CONTROL_GET_CUR) && !(inf & (1 << 0))) ||
+		    ((flags & UVC_CONTROL_SET_CUR) && !(inf & (1 << 1)))) {
+			uvc_trace(UVC_TRACE_CONTROL, "Control "
+				UVC_GUID_FORMAT "/%u flags don't match "
+				"supported operations.\n",
+				UVC_GUID_ARGS(info->entity), info->selector);
+			return;
+		}
+	}
+
+	ctrl->info = info;
+	ctrl->data = kmalloc(ctrl->info->size * UVC_CTRL_NDATA, GFP_KERNEL);
+	uvc_trace(UVC_TRACE_CONTROL, "Added control " UVC_GUID_FORMAT "/%u "
+		"to device %s entity %u\n", UVC_GUID_ARGS(ctrl->info->entity),
+		ctrl->info->selector, dev->udev->devpath, entity->id);
+}
+
+/*
+ * Add an item to the UVC control information list, and instantiate a control
+ * structure for each device that supports the control.
+ */
+int uvc_ctrl_add_info(struct uvc_control_info *info)
+{
+	struct uvc_control_info *ctrl;
+	struct uvc_device *dev;
+	int ret = 0;
+
+	/* Find matching controls by walking the devices, entities and
+	 * controls list.
+	 */
+	mutex_lock(&uvc_driver.ctrl_mutex);
+
+	/* First check if the list contains a control matching the new one.
+	 * Bail out if it does.
+	 */
+	list_for_each_entry(ctrl, &uvc_driver.controls, list) {
+		if (memcmp(ctrl->entity, info->entity, 16))
+			continue;
+
+		if (ctrl->selector == info->selector) {
+			uvc_trace(UVC_TRACE_CONTROL, "Control "
+				UVC_GUID_FORMAT "/%u is already defined.\n",
+				UVC_GUID_ARGS(info->entity), info->selector);
+			ret = -EEXIST;
+			goto end;
+		}
+		if (ctrl->index == info->index) {
+			uvc_trace(UVC_TRACE_CONTROL, "Control "
+				UVC_GUID_FORMAT "/%u would overwrite index "
+				"%d.\n", UVC_GUID_ARGS(info->entity),
+				info->selector, info->index);
+			ret = -EEXIST;
+			goto end;
+		}
+	}
+
+	list_for_each_entry(dev, &uvc_driver.devices, list)
+		uvc_ctrl_add_ctrl(dev, info);
+
+	INIT_LIST_HEAD(&info->mappings);
+	list_add_tail(&info->list, &uvc_driver.controls);
+end:
+	mutex_unlock(&uvc_driver.ctrl_mutex);
+	return ret;
+}
+
+int uvc_ctrl_add_mapping(struct uvc_control_mapping *mapping)
+{
+	struct uvc_control_info *info;
+	struct uvc_control_mapping *map;
+	int ret = -EINVAL;
+
+	if (mapping->id & ~V4L2_CTRL_ID_MASK) {
+		uvc_trace(UVC_TRACE_CONTROL, "Can't add mapping '%s' with "
+			"invalid control id 0x%08x\n", mapping->name,
+			mapping->id);
+		return -EINVAL;
+	}
+
+	mutex_lock(&uvc_driver.ctrl_mutex);
+	list_for_each_entry(info, &uvc_driver.controls, list) {
+		if (memcmp(info->entity, mapping->entity, 16) ||
+			info->selector != mapping->selector)
+			continue;
+
+		if (info->size * 8 < mapping->size + mapping->offset) {
+			uvc_trace(UVC_TRACE_CONTROL, "Mapping '%s' would "
+				"overflow control " UVC_GUID_FORMAT "/%u\n",
+				mapping->name, UVC_GUID_ARGS(info->entity),
+				info->selector);
+			ret = -EOVERFLOW;
+			goto end;
+		}
+
+		/* Check if the list contains a mapping matching the new one.
+		 * Bail out if it does.
+		 */
+		list_for_each_entry(map, &info->mappings, list) {
+			if (map->id == mapping->id) {
+				uvc_trace(UVC_TRACE_CONTROL, "Mapping '%s' is "
+					"already defined.\n", mapping->name);
+				ret = -EEXIST;
+				goto end;
+			}
+		}
+
+		mapping->ctrl = info;
+		list_add_tail(&mapping->list, &info->mappings);
+		uvc_trace(UVC_TRACE_CONTROL, "Adding mapping %s to control "
+			UVC_GUID_FORMAT "/%u.\n", mapping->name,
+			UVC_GUID_ARGS(info->entity), info->selector);
+
+		ret = 0;
+		break;
+	}
+end:
+	mutex_unlock(&uvc_driver.ctrl_mutex);
+	return ret;
+}
+
+/*
+ * Initialize device controls.
+ */
+int uvc_ctrl_init_device(struct uvc_device *dev)
+{
+	struct uvc_control_info *info;
+	struct uvc_control *ctrl;
+	struct uvc_entity *entity;
+	unsigned int i;
+
+	/* Walk the entities list and instantiate controls */
+	list_for_each_entry(entity, &dev->entities, list) {
+		unsigned int bControlSize = 0, ncontrols = 0;
+		__u8 *bmControls = NULL;
+
+		if (UVC_ENTITY_TYPE(entity) == VC_EXTENSION_UNIT) {
+			bmControls = entity->extension.bmControls;
+			bControlSize = entity->extension.bControlSize;
+		} else if (UVC_ENTITY_TYPE(entity) == VC_PROCESSING_UNIT) {
+			bmControls = entity->processing.bmControls;
+			bControlSize = entity->processing.bControlSize;
+		} else if (UVC_ENTITY_TYPE(entity) == ITT_CAMERA) {
+			bmControls = entity->camera.bmControls;
+			bControlSize = entity->camera.bControlSize;
+		}
+
+		for (i = 0; i < bControlSize; ++i)
+			ncontrols += hweight8(bmControls[i]);
+
+		if (ncontrols == 0)
+			continue;
+
+		entity->controls = kzalloc(ncontrols*sizeof *ctrl, GFP_KERNEL);
+		if (entity->controls == NULL)
+			return -ENOMEM;
+
+		entity->ncontrols = ncontrols;
+
+		ctrl = entity->controls;
+		for (i = 0; i < bControlSize * 8; ++i) {
+			if (uvc_get_bit(bmControls, i) == 0)
+				continue;
+
+			ctrl->entity = entity;
+			ctrl->index = i;
+			ctrl++;
+		}
+	}
+
+	/* Walk the controls info list and associate them with the device
+	 * controls, then add the device to the global device list. This has
+	 * to be done while holding the controls lock, to make sure
+	 * uvc_ctrl_add_info() will not get called in-between.
+	 */
+	mutex_lock(&uvc_driver.ctrl_mutex);
+	list_for_each_entry(info, &uvc_driver.controls, list)
+		uvc_ctrl_add_ctrl(dev, info);
+
+	list_add_tail(&dev->list, &uvc_driver.devices);
+	mutex_unlock(&uvc_driver.ctrl_mutex);
+
+	return 0;
+}
+
+/*
+ * Cleanup device controls.
+ */
+void uvc_ctrl_cleanup_device(struct uvc_device *dev)
+{
+	struct uvc_entity *entity;
+	unsigned int i;
+
+	/* Remove the device from the global devices list */
+	mutex_lock(&uvc_driver.ctrl_mutex);
+	if (dev->list.next != NULL)
+		list_del(&dev->list);
+	mutex_unlock(&uvc_driver.ctrl_mutex);
+
+	list_for_each_entry(entity, &dev->entities, list) {
+		for (i = 0; i < entity->ncontrols; ++i)
+			kfree(entity->controls[i].data);
+
+		kfree(entity->controls);
+	}
+}
+
+void uvc_ctrl_init(void)
+{
+	struct uvc_control_info *ctrl = uvc_ctrls;
+	struct uvc_control_info *cend = ctrl + ARRAY_SIZE(uvc_ctrls);
+	struct uvc_control_mapping *mapping = uvc_ctrl_mappings;
+	struct uvc_control_mapping *mend =
+		mapping + ARRAY_SIZE(uvc_ctrl_mappings);
+
+	for (; ctrl < cend; ++ctrl)
+		uvc_ctrl_add_info(ctrl);
+
+	for (; mapping < mend; ++mapping)
+		uvc_ctrl_add_mapping(mapping);
+}
diff --git a/drivers/media/video/uvc/uvc_driver.c b/drivers/media/video/uvc/uvc_driver.c
new file mode 100644
index 00000000000..60ced589f89
--- /dev/null
+++ b/drivers/media/video/uvc/uvc_driver.c
@@ -0,0 +1,1955 @@
+/*
+ *      uvc_driver.c  --  USB Video Class driver
+ *
+ *      Copyright (C) 2005-2008
+ *          Laurent Pinchart (laurent.pinchart@skynet.be)
+ *
+ *      This program is free software; you can redistribute it and/or modify
+ *      it under the terms of the GNU General Public License as published by
+ *      the Free Software Foundation; either version 2 of the License, or
+ *      (at your option) any later version.
+ *
+ */
+
+/*
+ * This driver aims to support video input devices compliant with the 'USB
+ * Video Class' specification.
+ *
+ * The driver doesn't support the deprecated v4l1 interface. It implements the
+ * mmap capture method only, and doesn't do any image format conversion in
+ * software. If your user-space application doesn't support YUYV or MJPEG, fix
+ * it :-). Please note that the MJPEG data have been stripped from their
+ * Huffman tables (DHT marker), you will need to add it back if your JPEG
+ * codec can't handle MJPEG data.
+ */
+
+#include <linux/kernel.h>
+#include <linux/version.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/usb.h>
+#include <linux/videodev2.h>
+#include <linux/vmalloc.h>
+#include <linux/wait.h>
+#include <asm/atomic.h>
+
+#include <media/v4l2-common.h>
+
+#include "uvcvideo.h"
+
+#define DRIVER_AUTHOR		"Laurent Pinchart <laurent.pinchart@skynet.be>"
+#define DRIVER_DESC		"USB Video Class driver"
+#ifndef DRIVER_VERSION
+#define DRIVER_VERSION		"v0.1.0"
+#endif
+
+static unsigned int uvc_quirks_param;
+unsigned int uvc_trace_param;
+
+/* ------------------------------------------------------------------------
+ * Control, formats, ...
+ */
+
+static struct uvc_format_desc uvc_fmts[] = {
+	{
+		.name		= "YUV 4:2:2 (YUYV)",
+		.guid		= UVC_GUID_FORMAT_YUY2,
+		.fcc		= V4L2_PIX_FMT_YUYV,
+	},
+	{
+		.name		= "YUV 4:2:0 (NV12)",
+		.guid		= UVC_GUID_FORMAT_NV12,
+		.fcc		= V4L2_PIX_FMT_NV12,
+	},
+	{
+		.name		= "MJPEG",
+		.guid		= UVC_GUID_FORMAT_MJPEG,
+		.fcc		= V4L2_PIX_FMT_MJPEG,
+	},
+	{
+		.name		= "YVU 4:2:0 (YV12)",
+		.guid		= UVC_GUID_FORMAT_YV12,
+		.fcc		= V4L2_PIX_FMT_YVU420,
+	},
+	{
+		.name		= "YUV 4:2:0 (I420)",
+		.guid		= UVC_GUID_FORMAT_I420,
+		.fcc		= V4L2_PIX_FMT_YUV420,
+	},
+	{
+		.name		= "YUV 4:2:2 (UYVY)",
+		.guid		= UVC_GUID_FORMAT_UYVY,
+		.fcc		= V4L2_PIX_FMT_UYVY,
+	},
+	{
+		.name		= "Greyscale",
+		.guid		= UVC_GUID_FORMAT_Y800,
+		.fcc		= V4L2_PIX_FMT_GREY,
+	},
+	{
+		.name		= "RGB Bayer",
+		.guid		= UVC_GUID_FORMAT_BY8,
+		.fcc		= V4L2_PIX_FMT_SBGGR8,
+	},
+};
+
+/* ------------------------------------------------------------------------
+ * Utility functions
+ */
+
+struct usb_host_endpoint *uvc_find_endpoint(struct usb_host_interface *alts,
+		__u8 epaddr)
+{
+	struct usb_host_endpoint *ep;
+	unsigned int i;
+
+	for (i = 0; i < alts->desc.bNumEndpoints; ++i) {
+		ep = &alts->endpoint[i];
+		if (ep->desc.bEndpointAddress == epaddr)
+			return ep;
+	}
+
+	return NULL;
+}
+
+static struct uvc_format_desc *uvc_format_by_guid(const __u8 guid[16])
+{
+	unsigned int len = ARRAY_SIZE(uvc_fmts);
+	unsigned int i;
+
+	for (i = 0; i < len; ++i) {
+		if (memcmp(guid, uvc_fmts[i].guid, 16) == 0)
+			return &uvc_fmts[i];
+	}
+
+	return NULL;
+}
+
+static __u32 uvc_colorspace(const __u8 primaries)
+{
+	static const __u8 colorprimaries[] = {
+		0,
+		V4L2_COLORSPACE_SRGB,
+		V4L2_COLORSPACE_470_SYSTEM_M,
+		V4L2_COLORSPACE_470_SYSTEM_BG,
+		V4L2_COLORSPACE_SMPTE170M,
+		V4L2_COLORSPACE_SMPTE240M,
+	};
+
+	if (primaries < ARRAY_SIZE(colorprimaries))
+		return colorprimaries[primaries];
+
+	return 0;
+}
+
+/* Simplify a fraction using a simple continued fraction decomposition. The
+ * idea here is to convert fractions such as 333333/10000000 to 1/30 using
+ * 32 bit arithmetic only. The algorithm is not perfect and relies upon two
+ * arbitrary parameters to remove non-significative terms from the simple
+ * continued fraction decomposition. Using 8 and 333 for n_terms and threshold
+ * respectively seems to give nice results.
+ */
+void uvc_simplify_fraction(uint32_t *numerator, uint32_t *denominator,
+		unsigned int n_terms, unsigned int threshold)
+{
+	uint32_t *an;
+	uint32_t x, y, r;
+	unsigned int i, n;
+
+	an = kmalloc(n_terms * sizeof *an, GFP_KERNEL);
+	if (an == NULL)
+		return;
+
+	/* Convert the fraction to a simple continued fraction. See
+	 * http://mathforum.org/dr.math/faq/faq.fractions.html
+	 * Stop if the current term is bigger than or equal to the given
+	 * threshold.
+	 */
+	x = *numerator;
+	y = *denominator;
+
+	for (n = 0; n < n_terms && y != 0; ++n) {
+		an[n] = x / y;
+		if (an[n] >= threshold) {
+			if (n < 2)
+				n++;
+			break;
+		}
+
+		r = x - an[n] * y;
+		x = y;
+		y = r;
+	}
+
+	/* Expand the simple continued fraction back to an integer fraction. */
+	x = 0;
+	y = 1;
+
+	for (i = n; i > 0; --i) {
+		r = y;
+		y = an[i-1] * y + x;
+		x = r;
+	}
+
+	*numerator = y;
+	*denominator = x;
+	kfree(an);
+}
+
+/* Convert a fraction to a frame interval in 100ns multiples. The idea here is
+ * to compute numerator / denominator * 10000000 using 32 bit fixed point
+ * arithmetic only.
+ */
+uint32_t uvc_fraction_to_interval(uint32_t numerator, uint32_t denominator)
+{
+	uint32_t multiplier;
+
+	/* Saturate the result if the operation would overflow. */
+	if (denominator == 0 ||
+	    numerator/denominator >= ((uint32_t)-1)/10000000)
+		return (uint32_t)-1;
+
+	/* Divide both the denominator and the multiplier by two until
+	 * numerator * multiplier doesn't overflow. If anyone knows a better
+	 * algorithm please let me know.
+	 */
+	multiplier = 10000000;
+	while (numerator > ((uint32_t)-1)/multiplier) {
+		multiplier /= 2;
+		denominator /= 2;
+	}
+
+	return denominator ? numerator * multiplier / denominator : 0;
+}
+
+/* ------------------------------------------------------------------------
+ * Terminal and unit management
+ */
+
+static struct uvc_entity *uvc_entity_by_id(struct uvc_device *dev, int id)
+{
+	struct uvc_entity *entity;
+
+	list_for_each_entry(entity, &dev->entities, list) {
+		if (entity->id == id)
+			return entity;
+	}
+
+	return NULL;
+}
+
+static struct uvc_entity *uvc_entity_by_reference(struct uvc_device *dev,
+	int id, struct uvc_entity *entity)
+{
+	unsigned int i;
+
+	if (entity == NULL)
+		entity = list_entry(&dev->entities, struct uvc_entity, list);
+
+	list_for_each_entry_continue(entity, &dev->entities, list) {
+		switch (UVC_ENTITY_TYPE(entity)) {
+		case TT_STREAMING:
+			if (entity->output.bSourceID == id)
+				return entity;
+			break;
+
+		case VC_PROCESSING_UNIT:
+			if (entity->processing.bSourceID == id)
+				return entity;
+			break;
+
+		case VC_SELECTOR_UNIT:
+			for (i = 0; i < entity->selector.bNrInPins; ++i)
+				if (entity->selector.baSourceID[i] == id)
+					return entity;
+			break;
+
+		case VC_EXTENSION_UNIT:
+			for (i = 0; i < entity->extension.bNrInPins; ++i)
+				if (entity->extension.baSourceID[i] == id)
+					return entity;
+			break;
+		}
+	}
+
+	return NULL;
+}
+
+/* ------------------------------------------------------------------------
+ * Descriptors handling
+ */
+
+static int uvc_parse_format(struct uvc_device *dev,
+	struct uvc_streaming *streaming, struct uvc_format *format,
+	__u32 **intervals, unsigned char *buffer, int buflen)
+{
+	struct usb_interface *intf = streaming->intf;
+	struct usb_host_interface *alts = intf->cur_altsetting;
+	struct uvc_format_desc *fmtdesc;
+	struct uvc_frame *frame;
+	const unsigned char *start = buffer;
+	unsigned int interval;
+	unsigned int i, n;
+	__u8 ftype;
+
+	format->type = buffer[2];
+	format->index = buffer[3];
+
+	switch (buffer[2]) {
+	case VS_FORMAT_UNCOMPRESSED:
+	case VS_FORMAT_FRAME_BASED:
+		if (buflen < 27) {
+			uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
+			       "interface %d FORMAT error\n",
+			       dev->udev->devnum,
+			       alts->desc.bInterfaceNumber);
+			return -EINVAL;
+		}
+
+		/* Find the format descriptor from its GUID. */
+		fmtdesc = uvc_format_by_guid(&buffer[5]);
+
+		if (fmtdesc != NULL) {
+			strncpy(format->name, fmtdesc->name,
+				sizeof format->name);
+			format->fcc = fmtdesc->fcc;
+		} else {
+			uvc_printk(KERN_INFO, "Unknown video format "
+				UVC_GUID_FORMAT "\n",
+				UVC_GUID_ARGS(&buffer[5]));
+			snprintf(format->name, sizeof format->name,
+				UVC_GUID_FORMAT, UVC_GUID_ARGS(&buffer[5]));
+			format->fcc = 0;
+		}
+
+		format->bpp = buffer[21];
+		if (buffer[2] == VS_FORMAT_UNCOMPRESSED) {
+			ftype = VS_FRAME_UNCOMPRESSED;
+		} else {
+			ftype = VS_FRAME_FRAME_BASED;
+			if (buffer[27])
+				format->flags = UVC_FMT_FLAG_COMPRESSED;
+		}
+		break;
+
+	case VS_FORMAT_MJPEG:
+		if (buflen < 11) {
+			uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
+			       "interface %d FORMAT error\n",
+			       dev->udev->devnum,
+			       alts->desc.bInterfaceNumber);
+			return -EINVAL;
+		}
+
+		strncpy(format->name, "MJPEG", sizeof format->name);
+		format->fcc = V4L2_PIX_FMT_MJPEG;
+		format->flags = UVC_FMT_FLAG_COMPRESSED;
+		format->bpp = 0;
+		ftype = VS_FRAME_MJPEG;
+		break;
+
+	case VS_FORMAT_DV:
+		if (buflen < 9) {
+			uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
+			       "interface %d FORMAT error\n",
+			       dev->udev->devnum,
+			       alts->desc.bInterfaceNumber);
+			return -EINVAL;
+		}
+
+		switch (buffer[8] & 0x7f) {
+		case 0:
+			strncpy(format->name, "SD-DV", sizeof format->name);
+			break;
+		case 1:
+			strncpy(format->name, "SDL-DV", sizeof format->name);
+			break;
+		case 2:
+			strncpy(format->name, "HD-DV", sizeof format->name);
+			break;
+		default:
+			uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
+			       "interface %d: unknown DV format %u\n",
+			       dev->udev->devnum,
+			       alts->desc.bInterfaceNumber, buffer[8]);
+			return -EINVAL;
+		}
+
+		strncat(format->name, buffer[8] & (1 << 7) ? " 60Hz" : " 50Hz",
+			sizeof format->name);
+
+		format->fcc = V4L2_PIX_FMT_DV;
+		format->flags = UVC_FMT_FLAG_COMPRESSED | UVC_FMT_FLAG_STREAM;
+		format->bpp = 0;
+		ftype = 0;
+
+		/* Create a dummy frame descriptor. */
+		frame = &format->frame[0];
+		memset(&format->frame[0], 0, sizeof format->frame[0]);
+		frame->bFrameIntervalType = 1;
+		frame->dwDefaultFrameInterval = 1;
+		frame->dwFrameInterval = *intervals;
+		*(*intervals)++ = 1;
+		format->nframes = 1;
+		break;
+
+	case VS_FORMAT_MPEG2TS:
+	case VS_FORMAT_STREAM_BASED:
+		/* Not supported yet. */
+	default:
+		uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
+		       "interface %d unsupported format %u\n",
+		       dev->udev->devnum, alts->desc.bInterfaceNumber,
+		       buffer[2]);
+		return -EINVAL;
+	}
+
+	uvc_trace(UVC_TRACE_DESCR, "Found format %s.\n", format->name);
+
+	buflen -= buffer[0];
+	buffer += buffer[0];
+
+	/* Parse the frame descriptors. Only uncompressed, MJPEG and frame
+	 * based formats have frame descriptors.
+	 */
+	while (buflen > 2 && buffer[2] == ftype) {
+		frame = &format->frame[format->nframes];
+
+		if (ftype != VS_FRAME_FRAME_BASED)
+			n = buflen > 25 ? buffer[25] : 0;
+		else
+			n = buflen > 21 ? buffer[21] : 0;
+
+		n = n ? n : 3;
+
+		if (buflen < 26 + 4*n) {
+			uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
+			       "interface %d FRAME error\n", dev->udev->devnum,
+			       alts->desc.bInterfaceNumber);
+			return -EINVAL;
+		}
+
+		frame->bFrameIndex = buffer[3];
+		frame->bmCapabilities = buffer[4];
+		frame->wWidth = le16_to_cpup((__le16 *)&buffer[5]);
+		frame->wHeight = le16_to_cpup((__le16 *)&buffer[7]);
+		frame->dwMinBitRate = le32_to_cpup((__le32 *)&buffer[9]);
+		frame->dwMaxBitRate = le32_to_cpup((__le32 *)&buffer[13]);
+		if (ftype != VS_FRAME_FRAME_BASED) {
+			frame->dwMaxVideoFrameBufferSize =
+				le32_to_cpup((__le32 *)&buffer[17]);
+			frame->dwDefaultFrameInterval =
+				le32_to_cpup((__le32 *)&buffer[21]);
+			frame->bFrameIntervalType = buffer[25];
+		} else {
+			frame->dwMaxVideoFrameBufferSize = 0;
+			frame->dwDefaultFrameInterval =
+				le32_to_cpup((__le32 *)&buffer[17]);
+			frame->bFrameIntervalType = buffer[21];
+		}
+		frame->dwFrameInterval = *intervals;
+
+		/* Several UVC chipsets screw up dwMaxVideoFrameBufferSize
+		 * completely. Observed behaviours range from setting the
+		 * value to 1.1x the actual frame size of hardwiring the
+		 * 16 low bits to 0. This results in a higher than necessary
+		 * memory usage as well as a wrong image size information. For
+		 * uncompressed formats this can be fixed by computing the
+		 * value from the frame size.
+		 */
+		if (!(format->flags & UVC_FMT_FLAG_COMPRESSED))
+			frame->dwMaxVideoFrameBufferSize = format->bpp
+				* frame->wWidth * frame->wHeight / 8;
+
+		/* Some bogus devices report dwMinFrameInterval equal to
+		 * dwMaxFrameInterval and have dwFrameIntervalStep set to
+		 * zero. Setting all null intervals to 1 fixes the problem and
+		 * some other divisions by zero which could happen.
+		 */
+		for (i = 0; i < n; ++i) {
+			interval = le32_to_cpup((__le32 *)&buffer[26+4*i]);
+			*(*intervals)++ = interval ? interval : 1;
+		}
+
+		/* Make sure that the default frame interval stays between
+		 * the boundaries.
+		 */
+		n -= frame->bFrameIntervalType ? 1 : 2;
+		frame->dwDefaultFrameInterval =
+			min(frame->dwFrameInterval[n],
+			    max(frame->dwFrameInterval[0],
+				frame->dwDefaultFrameInterval));
+
+		uvc_trace(UVC_TRACE_DESCR, "- %ux%u (%u.%u fps)\n",
+			frame->wWidth, frame->wHeight,
+			10000000/frame->dwDefaultFrameInterval,
+			(100000000/frame->dwDefaultFrameInterval)%10);
+
+		format->nframes++;
+		buflen -= buffer[0];
+		buffer += buffer[0];
+	}
+
+	if (buflen > 2 && buffer[2] == VS_STILL_IMAGE_FRAME) {
+		buflen -= buffer[0];
+		buffer += buffer[0];
+	}
+
+	if (buflen > 2 && buffer[2] == VS_COLORFORMAT) {
+		if (buflen < 6) {
+			uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
+			       "interface %d COLORFORMAT error\n",
+			       dev->udev->devnum,
+			       alts->desc.bInterfaceNumber);
+			return -EINVAL;
+		}
+
+		format->colorspace = uvc_colorspace(buffer[3]);
+
+		buflen -= buffer[0];
+		buffer += buffer[0];
+	}
+
+	return buffer - start;
+}
+
+static int uvc_parse_streaming(struct uvc_device *dev,
+	struct usb_interface *intf)
+{
+	struct uvc_streaming *streaming = NULL;
+	struct uvc_format *format;
+	struct uvc_frame *frame;
+	struct usb_host_interface *alts = &intf->altsetting[0];
+	unsigned char *_buffer, *buffer = alts->extra;
+	int _buflen, buflen = alts->extralen;
+	unsigned int nformats = 0, nframes = 0, nintervals = 0;
+	unsigned int size, i, n, p;
+	__u32 *interval;
+	__u16 psize;
+	int ret = -EINVAL;
+
+	if (intf->cur_altsetting->desc.bInterfaceSubClass
+		!= SC_VIDEOSTREAMING) {
+		uvc_trace(UVC_TRACE_DESCR, "device %d interface %d isn't a "
+			"video streaming interface\n", dev->udev->devnum,
+			intf->altsetting[0].desc.bInterfaceNumber);
+		return -EINVAL;
+	}
+
+	if (usb_driver_claim_interface(&uvc_driver.driver, intf, dev)) {
+		uvc_trace(UVC_TRACE_DESCR, "device %d interface %d is already "
+			"claimed\n", dev->udev->devnum,
+			intf->altsetting[0].desc.bInterfaceNumber);
+		return -EINVAL;
+	}
+
+	streaming = kzalloc(sizeof *streaming, GFP_KERNEL);
+	if (streaming == NULL) {
+		usb_driver_release_interface(&uvc_driver.driver, intf);
+		return -EINVAL;
+	}
+
+	mutex_init(&streaming->mutex);
+	streaming->intf = usb_get_intf(intf);
+	streaming->intfnum = intf->cur_altsetting->desc.bInterfaceNumber;
+
+	/* The Pico iMage webcam has its class-specific interface descriptors
+	 * after the endpoint descriptors.
+	 */
+	if (buflen == 0) {
+		for (i = 0; i < alts->desc.bNumEndpoints; ++i) {
+			struct usb_host_endpoint *ep = &alts->endpoint[i];
+
+			if (ep->extralen == 0)
+				continue;
+
+			if (ep->extralen > 2 &&
+			    ep->extra[1] == USB_DT_CS_INTERFACE) {
+				uvc_trace(UVC_TRACE_DESCR, "trying extra data "
+					"from endpoint %u.\n", i);
+				buffer = alts->endpoint[i].extra;
+				buflen = alts->endpoint[i].extralen;
+				break;
+			}
+		}
+	}
+
+	/* Skip the standard interface descriptors. */
+	while (buflen > 2 && buffer[1] != USB_DT_CS_INTERFACE) {
+		buflen -= buffer[0];
+		buffer += buffer[0];
+	}
+
+	if (buflen <= 2) {
+		uvc_trace(UVC_TRACE_DESCR, "no class-specific streaming "
+			"interface descriptors found.\n");
+		goto error;
+	}
+
+	/* Parse the header descriptor. */
+	if (buffer[2] == VS_OUTPUT_HEADER) {
+		uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
+			"%d OUTPUT HEADER descriptor is not supported.\n",
+			dev->udev->devnum, alts->desc.bInterfaceNumber);
+		goto error;
+	} else if (buffer[2] == VS_INPUT_HEADER) {
+		p = buflen >= 5 ? buffer[3] : 0;
+		n = buflen >= 12 ? buffer[12] : 0;
+
+		if (buflen < 13 + p*n || buffer[2] != VS_INPUT_HEADER) {
+			uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
+				"interface %d INPUT HEADER descriptor is "
+				"invalid.\n", dev->udev->devnum,
+				alts->desc.bInterfaceNumber);
+			goto error;
+		}
+
+		streaming->header.bNumFormats = p;
+		streaming->header.bEndpointAddress = buffer[6];
+		streaming->header.bmInfo = buffer[7];
+		streaming->header.bTerminalLink = buffer[8];
+		streaming->header.bStillCaptureMethod = buffer[9];
+		streaming->header.bTriggerSupport = buffer[10];
+		streaming->header.bTriggerUsage = buffer[11];
+		streaming->header.bControlSize = n;
+
+		streaming->header.bmaControls = kmalloc(p*n, GFP_KERNEL);
+		if (streaming->header.bmaControls == NULL) {
+			ret = -ENOMEM;
+			goto error;
+		}
+
+		memcpy(streaming->header.bmaControls, &buffer[13], p*n);
+	} else {
+		uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
+			"%d HEADER descriptor not found.\n", dev->udev->devnum,
+			alts->desc.bInterfaceNumber);
+		goto error;
+	}
+
+	buflen -= buffer[0];
+	buffer += buffer[0];
+
+	_buffer = buffer;
+	_buflen = buflen;
+
+	/* Count the format and frame descriptors. */
+	while (_buflen > 2) {
+		switch (_buffer[2]) {
+		case VS_FORMAT_UNCOMPRESSED:
+		case VS_FORMAT_MJPEG:
+		case VS_FORMAT_FRAME_BASED:
+			nformats++;
+			break;
+
+		case VS_FORMAT_DV:
+			/* DV format has no frame descriptor. We will create a
+			 * dummy frame descriptor with a dummy frame interval.
+			 */
+			nformats++;
+			nframes++;
+			nintervals++;
+			break;
+
+		case VS_FORMAT_MPEG2TS:
+		case VS_FORMAT_STREAM_BASED:
+			uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
+				"interface %d FORMAT %u is not supported.\n",
+				dev->udev->devnum,
+				alts->desc.bInterfaceNumber, _buffer[2]);
+			break;
+
+		case VS_FRAME_UNCOMPRESSED:
+		case VS_FRAME_MJPEG:
+			nframes++;
+			if (_buflen > 25)
+				nintervals += _buffer[25] ? _buffer[25] : 3;
+			break;
+
+		case VS_FRAME_FRAME_BASED:
+			nframes++;
+			if (_buflen > 21)
+				nintervals += _buffer[21] ? _buffer[21] : 3;
+			break;
+		}
+
+		_buflen -= _buffer[0];
+		_buffer += _buffer[0];
+	}
+
+	if (nformats == 0) {
+		uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
+			"%d has no supported formats defined.\n",
+			dev->udev->devnum, alts->desc.bInterfaceNumber);
+		goto error;
+	}
+
+	size = nformats * sizeof *format + nframes * sizeof *frame
+	     + nintervals * sizeof *interval;
+	format = kzalloc(size, GFP_KERNEL);
+	if (format == NULL) {
+		ret = -ENOMEM;
+		goto error;
+	}
+
+	frame = (struct uvc_frame *)&format[nformats];
+	interval = (__u32 *)&frame[nframes];
+
+	streaming->format = format;
+	streaming->nformats = nformats;
+
+	/* Parse the format descriptors. */
+	while (buflen > 2) {
+		switch (buffer[2]) {
+		case VS_FORMAT_UNCOMPRESSED:
+		case VS_FORMAT_MJPEG:
+		case VS_FORMAT_DV:
+		case VS_FORMAT_FRAME_BASED:
+			format->frame = frame;
+			ret = uvc_parse_format(dev, streaming, format,
+				&interval, buffer, buflen);
+			if (ret < 0)
+				goto error;
+
+			frame += format->nframes;
+			format++;
+
+			buflen -= ret;
+			buffer += ret;
+			continue;
+
+		default:
+			break;
+		}
+
+		buflen -= buffer[0];
+		buffer += buffer[0];
+	}
+
+	/* Parse the alternate settings to find the maximum bandwidth. */
+	for (i = 0; i < intf->num_altsetting; ++i) {
+		struct usb_host_endpoint *ep;
+		alts = &intf->altsetting[i];
+		ep = uvc_find_endpoint(alts,
+				streaming->header.bEndpointAddress);
+		if (ep == NULL)
+			continue;
+
+		psize = le16_to_cpu(ep->desc.wMaxPacketSize);
+		psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
+		if (psize > streaming->maxpsize)
+			streaming->maxpsize = psize;
+	}
+
+	list_add_tail(&streaming->list, &dev->streaming);
+	return 0;
+
+error:
+	usb_driver_release_interface(&uvc_driver.driver, intf);
+	usb_put_intf(intf);
+	kfree(streaming->format);
+	kfree(streaming->header.bmaControls);
+	kfree(streaming);
+	return ret;
+}
+
+/* Parse vendor-specific extensions. */
+static int uvc_parse_vendor_control(struct uvc_device *dev,
+	const unsigned char *buffer, int buflen)
+{
+	struct usb_device *udev = dev->udev;
+	struct usb_host_interface *alts = dev->intf->cur_altsetting;
+	struct uvc_entity *unit;
+	unsigned int n, p;
+	int handled = 0;
+
+	switch (le16_to_cpu(dev->udev->descriptor.idVendor)) {
+	case 0x046d:		/* Logitech */
+		if (buffer[1] != 0x41 || buffer[2] != 0x01)
+			break;
+
+		/* Logitech implements several vendor specific functions
+		 * through vendor specific extension units (LXU).
+		 *
+		 * The LXU descriptors are similar to XU descriptors
+		 * (see "USB Device Video Class for Video Devices", section
+		 * 3.7.2.6 "Extension Unit Descriptor") with the following
+		 * differences:
+		 *
+		 * ----------------------------------------------------------
+		 * 0		bLength		1	 Number
+		 *	Size of this descriptor, in bytes: 24+p+n*2
+		 * ----------------------------------------------------------
+		 * 23+p+n	bmControlsType	N	Bitmap
+		 * 	Individual bits in the set are defined:
+		 * 	0: Absolute
+		 * 	1: Relative
+		 *
+		 * 	This bitset is mapped exactly the same as bmControls.
+		 * ----------------------------------------------------------
+		 * 23+p+n*2	bReserved	1	Boolean
+		 * ----------------------------------------------------------
+		 * 24+p+n*2	iExtension	1	Index
+		 *	Index of a string descriptor that describes this
+		 *	extension unit.
+		 * ----------------------------------------------------------
+		 */
+		p = buflen >= 22 ? buffer[21] : 0;
+		n = buflen >= 25 + p ? buffer[22+p] : 0;
+
+		if (buflen < 25 + p + 2*n) {
+			uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
+				"interface %d EXTENSION_UNIT error\n",
+				udev->devnum, alts->desc.bInterfaceNumber);
+			break;
+		}
+
+		unit = kzalloc(sizeof *unit + p + 2*n, GFP_KERNEL);
+		if (unit == NULL)
+			return -ENOMEM;
+
+		unit->id = buffer[3];
+		unit->type = VC_EXTENSION_UNIT;
+		memcpy(unit->extension.guidExtensionCode, &buffer[4], 16);
+		unit->extension.bNumControls = buffer[20];
+		unit->extension.bNrInPins =
+			le16_to_cpup((__le16 *)&buffer[21]);
+		unit->extension.baSourceID = (__u8 *)unit + sizeof *unit;
+		memcpy(unit->extension.baSourceID, &buffer[22], p);
+		unit->extension.bControlSize = buffer[22+p];
+		unit->extension.bmControls = (__u8 *)unit + sizeof *unit + p;
+		unit->extension.bmControlsType = (__u8 *)unit + sizeof *unit
+					       + p + n;
+		memcpy(unit->extension.bmControls, &buffer[23+p], 2*n);
+
+		if (buffer[24+p+2*n] != 0)
+			usb_string(udev, buffer[24+p+2*n], unit->name,
+				   sizeof unit->name);
+		else
+			sprintf(unit->name, "Extension %u", buffer[3]);
+
+		list_add_tail(&unit->list, &dev->entities);
+		handled = 1;
+		break;
+	}
+
+	return handled;
+}
+
+static int uvc_parse_standard_control(struct uvc_device *dev,
+	const unsigned char *buffer, int buflen)
+{
+	struct usb_device *udev = dev->udev;
+	struct uvc_entity *unit, *term;
+	struct usb_interface *intf;
+	struct usb_host_interface *alts = dev->intf->cur_altsetting;
+	unsigned int i, n, p, len;
+	__u16 type;
+
+	switch (buffer[2]) {
+	case VC_HEADER:
+		n = buflen >= 12 ? buffer[11] : 0;
+
+		if (buflen < 12 || buflen < 12 + n) {
+			uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
+				"interface %d HEADER error\n", udev->devnum,
+				alts->desc.bInterfaceNumber);
+			return -EINVAL;
+		}
+
+		dev->uvc_version = le16_to_cpup((__le16 *)&buffer[3]);
+		dev->clock_frequency = le32_to_cpup((__le32 *)&buffer[7]);
+
+		/* Parse all USB Video Streaming interfaces. */
+		for (i = 0; i < n; ++i) {
+			intf = usb_ifnum_to_if(udev, buffer[12+i]);
+			if (intf == NULL) {
+				uvc_trace(UVC_TRACE_DESCR, "device %d "
+					"interface %d doesn't exists\n",
+					udev->devnum, i);
+				continue;
+			}
+
+			uvc_parse_streaming(dev, intf);
+		}
+		break;
+
+	case VC_INPUT_TERMINAL:
+		if (buflen < 8) {
+			uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
+				"interface %d INPUT_TERMINAL error\n",
+				udev->devnum, alts->desc.bInterfaceNumber);
+			return -EINVAL;
+		}
+
+		/* Make sure the terminal type MSB is not null, otherwise it
+		 * could be confused with a unit.
+		 */
+		type = le16_to_cpup((__le16 *)&buffer[4]);
+		if ((type & 0xff00) == 0) {
+			uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
+				"interface %d INPUT_TERMINAL %d has invalid "
+				"type 0x%04x, skipping\n", udev->devnum,
+				alts->desc.bInterfaceNumber,
+				buffer[3], type);
+			return 0;
+		}
+
+		n = 0;
+		p = 0;
+		len = 8;
+
+		if (type == ITT_CAMERA) {
+			n = buflen >= 15 ? buffer[14] : 0;
+			len = 15;
+
+		} else if (type == ITT_MEDIA_TRANSPORT_INPUT) {
+			n = buflen >= 9 ? buffer[8] : 0;
+			p = buflen >= 10 + n ? buffer[9+n] : 0;
+			len = 10;
+		}
+
+		if (buflen < len + n + p) {
+			uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
+				"interface %d INPUT_TERMINAL error\n",
+				udev->devnum, alts->desc.bInterfaceNumber);
+			return -EINVAL;
+		}
+
+		term = kzalloc(sizeof *term + n + p, GFP_KERNEL);
+		if (term == NULL)
+			return -ENOMEM;
+
+		term->id = buffer[3];
+		term->type = type | UVC_TERM_INPUT;
+
+		if (UVC_ENTITY_TYPE(term) == ITT_CAMERA) {
+			term->camera.bControlSize = n;
+			term->camera.bmControls = (__u8 *)term + sizeof *term;
+			term->camera.wObjectiveFocalLengthMin =
+				le16_to_cpup((__le16 *)&buffer[8]);
+			term->camera.wObjectiveFocalLengthMax =
+				le16_to_cpup((__le16 *)&buffer[10]);
+			term->camera.wOcularFocalLength =
+				le16_to_cpup((__le16 *)&buffer[12]);
+			memcpy(term->camera.bmControls, &buffer[15], n);
+		} else if (UVC_ENTITY_TYPE(term) == ITT_MEDIA_TRANSPORT_INPUT) {
+			term->media.bControlSize = n;
+			term->media.bmControls = (__u8 *)term + sizeof *term;
+			term->media.bTransportModeSize = p;
+			term->media.bmTransportModes = (__u8 *)term
+						     + sizeof *term + n;
+			memcpy(term->media.bmControls, &buffer[9], n);
+			memcpy(term->media.bmTransportModes, &buffer[10+n], p);
+		}
+
+		if (buffer[7] != 0)
+			usb_string(udev, buffer[7], term->name,
+				   sizeof term->name);
+		else if (UVC_ENTITY_TYPE(term) == ITT_CAMERA)
+			sprintf(term->name, "Camera %u", buffer[3]);
+		else if (UVC_ENTITY_TYPE(term) == ITT_MEDIA_TRANSPORT_INPUT)
+			sprintf(term->name, "Media %u", buffer[3]);
+		else
+			sprintf(term->name, "Input %u", buffer[3]);
+
+		list_add_tail(&term->list, &dev->entities);
+		break;
+
+	case VC_OUTPUT_TERMINAL:
+		if (buflen < 9) {
+			uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
+				"interface %d OUTPUT_TERMINAL error\n",
+				udev->devnum, alts->desc.bInterfaceNumber);
+			return -EINVAL;
+		}
+
+		/* Make sure the terminal type MSB is not null, otherwise it
+		 * could be confused with a unit.
+		 */
+		type = le16_to_cpup((__le16 *)&buffer[4]);
+		if ((type & 0xff00) == 0) {
+			uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
+				"interface %d OUTPUT_TERMINAL %d has invalid "
+				"type 0x%04x, skipping\n", udev->devnum,
+				alts->desc.bInterfaceNumber, buffer[3], type);
+			return 0;
+		}
+
+		term = kzalloc(sizeof *term, GFP_KERNEL);
+		if (term == NULL)
+			return -ENOMEM;
+
+		term->id = buffer[3];
+		term->type = type | UVC_TERM_OUTPUT;
+		term->output.bSourceID = buffer[7];
+
+		if (buffer[8] != 0)
+			usb_string(udev, buffer[8], term->name,
+				   sizeof term->name);
+		else
+			sprintf(term->name, "Output %u", buffer[3]);
+
+		list_add_tail(&term->list, &dev->entities);
+		break;
+
+	case VC_SELECTOR_UNIT:
+		p = buflen >= 5 ? buffer[4] : 0;
+
+		if (buflen < 5 || buflen < 6 + p) {
+			uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
+				"interface %d SELECTOR_UNIT error\n",
+				udev->devnum, alts->desc.bInterfaceNumber);
+			return -EINVAL;
+		}
+
+		unit = kzalloc(sizeof *unit + p, GFP_KERNEL);
+		if (unit == NULL)
+			return -ENOMEM;
+
+		unit->id = buffer[3];
+		unit->type = buffer[2];
+		unit->selector.bNrInPins = buffer[4];
+		unit->selector.baSourceID = (__u8 *)unit + sizeof *unit;
+		memcpy(unit->selector.baSourceID, &buffer[5], p);
+
+		if (buffer[5+p] != 0)
+			usb_string(udev, buffer[5+p], unit->name,
+				   sizeof unit->name);
+		else
+			sprintf(unit->name, "Selector %u", buffer[3]);
+
+		list_add_tail(&unit->list, &dev->entities);
+		break;
+
+	case VC_PROCESSING_UNIT:
+		n = buflen >= 8 ? buffer[7] : 0;
+		p = dev->uvc_version >= 0x0110 ? 10 : 9;
+
+		if (buflen < p + n) {
+			uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
+				"interface %d PROCESSING_UNIT error\n",
+				udev->devnum, alts->desc.bInterfaceNumber);
+			return -EINVAL;
+		}
+
+		unit = kzalloc(sizeof *unit + n, GFP_KERNEL);
+		if (unit == NULL)
+			return -ENOMEM;
+
+		unit->id = buffer[3];
+		unit->type = buffer[2];
+		unit->processing.bSourceID = buffer[4];
+		unit->processing.wMaxMultiplier =
+			le16_to_cpup((__le16 *)&buffer[5]);
+		unit->processing.bControlSize = buffer[7];
+		unit->processing.bmControls = (__u8 *)unit + sizeof *unit;
+		memcpy(unit->processing.bmControls, &buffer[8], n);
+		if (dev->uvc_version >= 0x0110)
+			unit->processing.bmVideoStandards = buffer[9+n];
+
+		if (buffer[8+n] != 0)
+			usb_string(udev, buffer[8+n], unit->name,
+				   sizeof unit->name);
+		else
+			sprintf(unit->name, "Processing %u", buffer[3]);
+
+		list_add_tail(&unit->list, &dev->entities);
+		break;
+
+	case VC_EXTENSION_UNIT:
+		p = buflen >= 22 ? buffer[21] : 0;
+		n = buflen >= 24 + p ? buffer[22+p] : 0;
+
+		if (buflen < 24 + p + n) {
+			uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
+				"interface %d EXTENSION_UNIT error\n",
+				udev->devnum, alts->desc.bInterfaceNumber);
+			return -EINVAL;
+		}
+
+		unit = kzalloc(sizeof *unit + p + n, GFP_KERNEL);
+		if (unit == NULL)
+			return -ENOMEM;
+
+		unit->id = buffer[3];
+		unit->type = buffer[2];
+		memcpy(unit->extension.guidExtensionCode, &buffer[4], 16);
+		unit->extension.bNumControls = buffer[20];
+		unit->extension.bNrInPins =
+			le16_to_cpup((__le16 *)&buffer[21]);
+		unit->extension.baSourceID = (__u8 *)unit + sizeof *unit;
+		memcpy(unit->extension.baSourceID, &buffer[22], p);
+		unit->extension.bControlSize = buffer[22+p];
+		unit->extension.bmControls = (__u8 *)unit + sizeof *unit + p;
+		memcpy(unit->extension.bmControls, &buffer[23+p], n);
+
+		if (buffer[23+p+n] != 0)
+			usb_string(udev, buffer[23+p+n], unit->name,
+				   sizeof unit->name);
+		else
+			sprintf(unit->name, "Extension %u", buffer[3]);
+
+		list_add_tail(&unit->list, &dev->entities);
+		break;
+
+	default:
+		uvc_trace(UVC_TRACE_DESCR, "Found an unknown CS_INTERFACE "
+			"descriptor (%u)\n", buffer[2]);
+		break;
+	}
+
+	return 0;
+}
+
+static int uvc_parse_control(struct uvc_device *dev)
+{
+	struct usb_host_interface *alts = dev->intf->cur_altsetting;
+	unsigned char *buffer = alts->extra;
+	int buflen = alts->extralen;
+	int ret;
+
+	/* Parse the default alternate setting only, as the UVC specification
+	 * defines a single alternate setting, the default alternate setting
+	 * zero.
+	 */
+
+	while (buflen > 2) {
+		if (uvc_parse_vendor_control(dev, buffer, buflen) ||
+		    buffer[1] != USB_DT_CS_INTERFACE)
+			goto next_descriptor;
+
+		if ((ret = uvc_parse_standard_control(dev, buffer, buflen)) < 0)
+			return ret;
+
+next_descriptor:
+		buflen -= buffer[0];
+		buffer += buffer[0];
+	}
+
+	/* Check if the optional status endpoint is present. */
+	if (alts->desc.bNumEndpoints == 1) {
+		struct usb_host_endpoint *ep = &alts->endpoint[0];
+		struct usb_endpoint_descriptor *desc = &ep->desc;
+
+		if (usb_endpoint_is_int_in(desc) &&
+		    le16_to_cpu(desc->wMaxPacketSize) >= 8 &&
+		    desc->bInterval != 0) {
+			uvc_trace(UVC_TRACE_DESCR, "Found a Status endpoint "
+				"(addr %02x).\n", desc->bEndpointAddress);
+			dev->int_ep = ep;
+		}
+	}
+
+	return 0;
+}
+
+/* ------------------------------------------------------------------------
+ * USB probe and disconnect
+ */
+
+/*
+ * Unregister the video devices.
+ */
+static void uvc_unregister_video(struct uvc_device *dev)
+{
+	if (dev->video.vdev) {
+		if (dev->video.vdev->minor == -1)
+			video_device_release(dev->video.vdev);
+		else
+			video_unregister_device(dev->video.vdev);
+		dev->video.vdev = NULL;
+	}
+}
+
+/*
+ * Scan the UVC descriptors to locate a chain starting at an Output Terminal
+ * and containing the following units:
+ *
+ * - a USB Streaming Output Terminal
+ * - zero or one Processing Unit
+ * - zero, one or mode single-input Selector Units
+ * - zero or one multiple-input Selector Units, provided all inputs are
+ *   connected to input terminals
+ * - zero, one or mode single-input Extension Units
+ * - one Camera Input Terminal, or one or more External terminals.
+ *
+ * A side forward scan is made on each detected entity to check for additional
+ * extension units.
+ */
+static int uvc_scan_chain_entity(struct uvc_video_device *video,
+	struct uvc_entity *entity)
+{
+	switch (UVC_ENTITY_TYPE(entity)) {
+	case VC_EXTENSION_UNIT:
+		if (uvc_trace_param & UVC_TRACE_PROBE)
+			printk(" <- XU %d", entity->id);
+
+		if (entity->extension.bNrInPins != 1) {
+			uvc_trace(UVC_TRACE_DESCR, "Extension unit %d has more "
+				"than 1 input pin.\n", entity->id);
+			return -1;
+		}
+
+		list_add_tail(&entity->chain, &video->extensions);
+		break;
+
+	case VC_PROCESSING_UNIT:
+		if (uvc_trace_param & UVC_TRACE_PROBE)
+			printk(" <- PU %d", entity->id);
+
+		if (video->processing != NULL) {
+			uvc_trace(UVC_TRACE_DESCR, "Found multiple "
+				"Processing Units in chain.\n");
+			return -1;
+		}
+
+		video->processing = entity;
+		break;
+
+	case VC_SELECTOR_UNIT:
+		if (uvc_trace_param & UVC_TRACE_PROBE)
+			printk(" <- SU %d", entity->id);
+
+		/* Single-input selector units are ignored. */
+		if (entity->selector.bNrInPins == 1)
+			break;
+
+		if (video->selector != NULL) {
+			uvc_trace(UVC_TRACE_DESCR, "Found multiple Selector "
+				"Units in chain.\n");
+			return -1;
+		}
+
+		video->selector = entity;
+		break;
+
+	case ITT_VENDOR_SPECIFIC:
+	case ITT_CAMERA:
+	case ITT_MEDIA_TRANSPORT_INPUT:
+		if (uvc_trace_param & UVC_TRACE_PROBE)
+			printk(" <- IT %d\n", entity->id);
+
+		list_add_tail(&entity->chain, &video->iterms);
+		break;
+
+	default:
+		uvc_trace(UVC_TRACE_DESCR, "Unsupported entity type "
+			"0x%04x found in chain.\n", UVC_ENTITY_TYPE(entity));
+		return -1;
+	}
+
+	return 0;
+}
+
+static int uvc_scan_chain_forward(struct uvc_video_device *video,
+	struct uvc_entity *entity, struct uvc_entity *prev)
+{
+	struct uvc_entity *forward;
+	int found;
+
+	/* Forward scan */
+	forward = NULL;
+	found = 0;
+
+	while (1) {
+		forward = uvc_entity_by_reference(video->dev, entity->id,
+			forward);
+		if (forward == NULL)
+			break;
+
+		if (UVC_ENTITY_TYPE(forward) != VC_EXTENSION_UNIT ||
+		    forward == prev)
+			continue;
+
+		if (forward->extension.bNrInPins != 1) {
+			uvc_trace(UVC_TRACE_DESCR, "Extension unit %d has"
+				"more than 1 input pin.\n", entity->id);
+			return -1;
+		}
+
+		list_add_tail(&forward->chain, &video->extensions);
+		if (uvc_trace_param & UVC_TRACE_PROBE) {
+			if (!found)
+				printk(" (-> XU");
+
+			printk(" %d", forward->id);
+			found = 1;
+		}
+	}
+	if (found)
+		printk(")");
+
+	return 0;
+}
+
+static int uvc_scan_chain_backward(struct uvc_video_device *video,
+	struct uvc_entity *entity)
+{
+	struct uvc_entity *term;
+	int id = -1, i;
+
+	switch (UVC_ENTITY_TYPE(entity)) {
+	case VC_EXTENSION_UNIT:
+		id = entity->extension.baSourceID[0];
+		break;
+
+	case VC_PROCESSING_UNIT:
+		id = entity->processing.bSourceID;
+		break;
+
+	case VC_SELECTOR_UNIT:
+		/* Single-input selector units are ignored. */
+		if (entity->selector.bNrInPins == 1) {
+			id = entity->selector.baSourceID[0];
+			break;
+		}
+
+		if (uvc_trace_param & UVC_TRACE_PROBE)
+			printk(" <- IT");
+
+		video->selector = entity;
+		for (i = 0; i < entity->selector.bNrInPins; ++i) {
+			id = entity->selector.baSourceID[i];
+			term = uvc_entity_by_id(video->dev, id);
+			if (term == NULL || !UVC_ENTITY_IS_ITERM(term)) {
+				uvc_trace(UVC_TRACE_DESCR, "Selector unit %d "
+					"input %d isn't connected to an "
+					"input terminal\n", entity->id, i);
+				return -1;
+			}
+
+			if (uvc_trace_param & UVC_TRACE_PROBE)
+				printk(" %d", term->id);
+
+			list_add_tail(&term->chain, &video->iterms);
+			uvc_scan_chain_forward(video, term, entity);
+		}
+
+		if (uvc_trace_param & UVC_TRACE_PROBE)
+			printk("\n");
+
+		id = 0;
+		break;
+	}
+
+	return id;
+}
+
+static int uvc_scan_chain(struct uvc_video_device *video)
+{
+	struct uvc_entity *entity, *prev;
+	int id;
+
+	entity = video->oterm;
+	uvc_trace(UVC_TRACE_PROBE, "Scanning UVC chain: OT %d", entity->id);
+	id = entity->output.bSourceID;
+	while (id != 0) {
+		prev = entity;
+		entity = uvc_entity_by_id(video->dev, id);
+		if (entity == NULL) {
+			uvc_trace(UVC_TRACE_DESCR, "Found reference to "
+				"unknown entity %d.\n", id);
+			return -1;
+		}
+
+		/* Process entity */
+		if (uvc_scan_chain_entity(video, entity) < 0)
+			return -1;
+
+		/* Forward scan */
+		if (uvc_scan_chain_forward(video, entity, prev) < 0)
+			return -1;
+
+		/* Stop when a terminal is found. */
+		if (!UVC_ENTITY_IS_UNIT(entity))
+			break;
+
+		/* Backward scan */
+		id = uvc_scan_chain_backward(video, entity);
+		if (id < 0)
+			return id;
+	}
+
+	/* Initialize the video buffers queue. */
+	uvc_queue_init(&video->queue);
+
+	return 0;
+}
+
+/*
+ * Register the video devices.
+ *
+ * The driver currently supports a single video device per control interface
+ * only. The terminal and units must match the following structure:
+ *
+ * ITT_CAMERA -> VC_PROCESSING_UNIT -> VC_EXTENSION_UNIT{0,n} -> TT_STREAMING
+ *
+ * The Extension Units, if present, must have a single input pin. The
+ * Processing Unit and Extension Units can be in any order. Additional
+ * Extension Units connected to the main chain as single-unit branches are
+ * also supported.
+ */
+static int uvc_register_video(struct uvc_device *dev)
+{
+	struct video_device *vdev;
+	struct uvc_entity *term;
+	int found = 0, ret;
+
+	/* Check if the control interface matches the structure we expect. */
+	list_for_each_entry(term, &dev->entities, list) {
+		struct uvc_streaming *streaming;
+
+		if (UVC_ENTITY_TYPE(term) != TT_STREAMING)
+			continue;
+
+		memset(&dev->video, 0, sizeof dev->video);
+		mutex_init(&dev->video.ctrl_mutex);
+		INIT_LIST_HEAD(&dev->video.iterms);
+		INIT_LIST_HEAD(&dev->video.extensions);
+		dev->video.oterm = term;
+		dev->video.dev = dev;
+		if (uvc_scan_chain(&dev->video) < 0)
+			continue;
+
+		list_for_each_entry(streaming, &dev->streaming, list) {
+			if (streaming->header.bTerminalLink == term->id) {
+				dev->video.streaming = streaming;
+				found = 1;
+				break;
+			}
+		}
+
+		if (found)
+			break;
+	}
+
+	if (!found) {
+		uvc_printk(KERN_INFO, "No valid video chain found.\n");
+		return -1;
+	}
+
+	if (uvc_trace_param & UVC_TRACE_PROBE) {
+		uvc_printk(KERN_INFO, "Found a valid video chain (");
+		list_for_each_entry(term, &dev->video.iterms, chain) {
+			printk("%d", term->id);
+			if (term->chain.next != &dev->video.iterms)
+				printk(",");
+		}
+		printk(" -> %d).\n", dev->video.oterm->id);
+	}
+
+	/* Initialize the streaming interface with default streaming
+	 * parameters.
+	 */
+	if ((ret = uvc_video_init(&dev->video)) < 0) {
+		uvc_printk(KERN_ERR, "Failed to initialize the device "
+			"(%d).\n", ret);
+		return ret;
+	}
+
+	/* Register the device with V4L. */
+	vdev = video_device_alloc();
+	if (vdev == NULL)
+		return -1;
+
+	/* We already hold a reference to dev->udev. The video device will be
+	 * unregistered before the reference is released, so we don't need to
+	 * get another one.
+	 */
+	vdev->dev = &dev->intf->dev;
+	vdev->type = 0;
+	vdev->type2 = 0;
+	vdev->minor = -1;
+	vdev->fops = &uvc_fops;
+	vdev->release = video_device_release;
+	strncpy(vdev->name, dev->name, sizeof vdev->name);
+
+	/* Set the driver data before calling video_register_device, otherwise
+	 * uvc_v4l2_open might race us.
+	 *
+	 * FIXME: usb_set_intfdata hasn't been called so far. Is that a
+	 * 	  problem ? Does any function which could be called here get
+	 * 	  a pointer to the usb_interface ?
+	 */
+	dev->video.vdev = vdev;
+	video_set_drvdata(vdev, &dev->video);
+
+	if (video_register_device(vdev, VFL_TYPE_GRABBER, -1) < 0) {
+		dev->video.vdev = NULL;
+		video_device_release(vdev);
+		return -1;
+	}
+
+	return 0;
+}
+
+/*
+ * Delete the UVC device.
+ *
+ * Called by the kernel when the last reference to the uvc_device structure
+ * is released.
+ *
+ * Unregistering the video devices is done here because every opened instance
+ * must be closed before the device can be unregistered. An alternative would
+ * have been to use another reference count for uvc_v4l2_open/uvc_release, and
+ * unregister the video devices on disconnect when that reference count drops
+ * to zero.
+ *
+ * As this function is called after or during disconnect(), all URBs have
+ * already been canceled by the USB core. There is no need to kill the
+ * interrupt URB manually.
+ */
+void uvc_delete(struct kref *kref)
+{
+	struct uvc_device *dev = container_of(kref, struct uvc_device, kref);
+	struct list_head *p, *n;
+
+	/* Unregister the video device */
+	uvc_unregister_video(dev);
+	usb_put_intf(dev->intf);
+	usb_put_dev(dev->udev);
+
+	uvc_status_cleanup(dev);
+	uvc_ctrl_cleanup_device(dev);
+
+	list_for_each_safe(p, n, &dev->entities) {
+		struct uvc_entity *entity;
+		entity = list_entry(p, struct uvc_entity, list);
+		kfree(entity);
+	}
+
+	list_for_each_safe(p, n, &dev->streaming) {
+		struct uvc_streaming *streaming;
+		streaming = list_entry(p, struct uvc_streaming, list);
+		usb_driver_release_interface(&uvc_driver.driver,
+			streaming->intf);
+		usb_put_intf(streaming->intf);
+		kfree(streaming->format);
+		kfree(streaming->header.bmaControls);
+		kfree(streaming);
+	}
+
+	kfree(dev);
+}
+
+static int uvc_probe(struct usb_interface *intf,
+		     const struct usb_device_id *id)
+{
+	struct usb_device *udev = interface_to_usbdev(intf);
+	struct uvc_device *dev;
+	int ret;
+
+	if (id->idVendor && id->idProduct)
+		uvc_trace(UVC_TRACE_PROBE, "Probing known UVC device %s "
+				"(%04x:%04x)\n", udev->devpath, id->idVendor,
+				id->idProduct);
+	else
+		uvc_trace(UVC_TRACE_PROBE, "Probing generic UVC device %s\n",
+				udev->devpath);
+
+	/* Allocate memory for the device and initialize it */
+	if ((dev = kzalloc(sizeof *dev, GFP_KERNEL)) == NULL)
+		return -ENOMEM;
+
+	INIT_LIST_HEAD(&dev->entities);
+	INIT_LIST_HEAD(&dev->streaming);
+	kref_init(&dev->kref);
+
+	dev->udev = usb_get_dev(udev);
+	dev->intf = usb_get_intf(intf);
+	dev->intfnum = intf->cur_altsetting->desc.bInterfaceNumber;
+	dev->quirks = id->driver_info | uvc_quirks_param;
+
+	if (udev->product != NULL)
+		strncpy(dev->name, udev->product, sizeof dev->name);
+	else
+		snprintf(dev->name, sizeof dev->name,
+			"UVC Camera (%04x:%04x)",
+			le16_to_cpu(udev->descriptor.idVendor),
+			le16_to_cpu(udev->descriptor.idProduct));
+
+	/* Parse the Video Class control descriptor */
+	if (uvc_parse_control(dev) < 0) {
+		uvc_trace(UVC_TRACE_PROBE, "Unable to parse UVC "
+			"descriptors.\n");
+		goto error;
+	}
+
+	uvc_printk(KERN_INFO, "Found UVC %u.%02u device %s (%04x:%04x)\n",
+		dev->uvc_version >> 8, dev->uvc_version & 0xff,
+		udev->product ? udev->product : "<unnamed>",
+		le16_to_cpu(udev->descriptor.idVendor),
+		le16_to_cpu(udev->descriptor.idProduct));
+
+	if (uvc_quirks_param != 0) {
+		uvc_printk(KERN_INFO, "Forcing device quirks 0x%x by module "
+			"parameter for testing purpose.\n", uvc_quirks_param);
+		uvc_printk(KERN_INFO, "Please report required quirks to the "
+			"linux-uvc-devel mailing list.\n");
+	}
+
+	/* Initialize controls */
+	if (uvc_ctrl_init_device(dev) < 0)
+		goto error;
+
+	/* Register the video devices */
+	if (uvc_register_video(dev) < 0)
+		goto error;
+
+	/* Save our data pointer in the interface data */
+	usb_set_intfdata(intf, dev);
+
+	/* Initialize the interrupt URB */
+	if ((ret = uvc_status_init(dev)) < 0) {
+		uvc_printk(KERN_INFO, "Unable to initialize the status "
+			"endpoint (%d), status interrupt will not be "
+			"supported.\n", ret);
+	}
+
+	uvc_trace(UVC_TRACE_PROBE, "UVC device initialized.\n");
+	return 0;
+
+error:
+	kref_put(&dev->kref, uvc_delete);
+	return -ENODEV;
+}
+
+static void uvc_disconnect(struct usb_interface *intf)
+{
+	struct uvc_device *dev = usb_get_intfdata(intf);
+
+	/* Set the USB interface data to NULL. This can be done outside the
+	 * lock, as there's no other reader.
+	 */
+	usb_set_intfdata(intf, NULL);
+
+	if (intf->cur_altsetting->desc.bInterfaceSubClass == SC_VIDEOSTREAMING)
+		return;
+
+	/* uvc_v4l2_open() might race uvc_disconnect(). A static driver-wide
+	 * lock is needed to prevent uvc_disconnect from releasing its
+	 * reference to the uvc_device instance after uvc_v4l2_open() received
+	 * the pointer to the device (video_devdata) but before it got the
+	 * chance to increase the reference count (kref_get).
+	 */
+	mutex_lock(&uvc_driver.open_mutex);
+
+	dev->state |= UVC_DEV_DISCONNECTED;
+	kref_put(&dev->kref, uvc_delete);
+
+	mutex_unlock(&uvc_driver.open_mutex);
+}
+
+static int uvc_suspend(struct usb_interface *intf, pm_message_t message)
+{
+	struct uvc_device *dev = usb_get_intfdata(intf);
+
+	uvc_trace(UVC_TRACE_SUSPEND, "Suspending interface %u\n",
+		intf->cur_altsetting->desc.bInterfaceNumber);
+
+	/* Controls are cached on the fly so they don't need to be saved. */
+	if (intf->cur_altsetting->desc.bInterfaceSubClass == SC_VIDEOCONTROL)
+		return uvc_status_suspend(dev);
+
+	if (dev->video.streaming->intf != intf) {
+		uvc_trace(UVC_TRACE_SUSPEND, "Suspend: video streaming USB "
+				"interface mismatch.\n");
+		return -EINVAL;
+	}
+
+	return uvc_video_suspend(&dev->video);
+}
+
+static int uvc_resume(struct usb_interface *intf)
+{
+	struct uvc_device *dev = usb_get_intfdata(intf);
+	int ret;
+
+	uvc_trace(UVC_TRACE_SUSPEND, "Resuming interface %u\n",
+		intf->cur_altsetting->desc.bInterfaceNumber);
+
+	if (intf->cur_altsetting->desc.bInterfaceSubClass == SC_VIDEOCONTROL) {
+		if ((ret = uvc_ctrl_resume_device(dev)) < 0)
+			return ret;
+
+		return uvc_status_resume(dev);
+	}
+
+	if (dev->video.streaming->intf != intf) {
+		uvc_trace(UVC_TRACE_SUSPEND, "Resume: video streaming USB "
+				"interface mismatch.\n");
+		return -EINVAL;
+	}
+
+	return uvc_video_resume(&dev->video);
+}
+
+/* ------------------------------------------------------------------------
+ * Driver initialization and cleanup
+ */
+
+/*
+ * The Logitech cameras listed below have their interface class set to
+ * VENDOR_SPEC because they don't announce themselves as UVC devices, even
+ * though they are compliant.
+ */
+static struct usb_device_id uvc_ids[] = {
+	/* ALi M5606 (Clevo M540SR) */
+	{ .match_flags		= USB_DEVICE_ID_MATCH_DEVICE
+				| USB_DEVICE_ID_MATCH_INT_INFO,
+	  .idVendor		= 0x0402,
+	  .idProduct		= 0x5606,
+	  .bInterfaceClass	= USB_CLASS_VIDEO,
+	  .bInterfaceSubClass	= 1,
+	  .bInterfaceProtocol	= 0,
+	  .driver_info		= UVC_QUIRK_PROBE_MINMAX },
+	/* Creative Live! Optia */
+	{ .match_flags		= USB_DEVICE_ID_MATCH_DEVICE
+				| USB_DEVICE_ID_MATCH_INT_INFO,
+	  .idVendor		= 0x041e,
+	  .idProduct		= 0x4057,
+	  .bInterfaceClass	= USB_CLASS_VIDEO,
+	  .bInterfaceSubClass	= 1,
+	  .bInterfaceProtocol	= 0,
+	  .driver_info		= UVC_QUIRK_PROBE_MINMAX },
+	/* Microsoft Lifecam NX-6000 */
+	{ .match_flags		= USB_DEVICE_ID_MATCH_DEVICE
+				| USB_DEVICE_ID_MATCH_INT_INFO,
+	  .idVendor		= 0x045e,
+	  .idProduct		= 0x00f8,
+	  .bInterfaceClass	= USB_CLASS_VIDEO,
+	  .bInterfaceSubClass	= 1,
+	  .bInterfaceProtocol	= 0,
+	  .driver_info		= UVC_QUIRK_PROBE_MINMAX },
+	/* Microsoft Lifecam VX-7000 */
+	{ .match_flags		= USB_DEVICE_ID_MATCH_DEVICE
+				| USB_DEVICE_ID_MATCH_INT_INFO,
+	  .idVendor		= 0x045e,
+	  .idProduct		= 0x0723,
+	  .bInterfaceClass	= USB_CLASS_VIDEO,
+	  .bInterfaceSubClass	= 1,
+	  .bInterfaceProtocol	= 0,
+	  .driver_info		= UVC_QUIRK_PROBE_MINMAX },
+	/* Logitech Quickcam Fusion */
+	{ .match_flags		= USB_DEVICE_ID_MATCH_DEVICE
+				| USB_DEVICE_ID_MATCH_INT_INFO,
+	  .idVendor		= 0x046d,
+	  .idProduct		= 0x08c1,
+	  .bInterfaceClass	= USB_CLASS_VENDOR_SPEC,
+	  .bInterfaceSubClass	= 1,
+	  .bInterfaceProtocol	= 0 },
+	/* Logitech Quickcam Orbit MP */
+	{ .match_flags		= USB_DEVICE_ID_MATCH_DEVICE
+				| USB_DEVICE_ID_MATCH_INT_INFO,
+	  .idVendor		= 0x046d,
+	  .idProduct		= 0x08c2,
+	  .bInterfaceClass	= USB_CLASS_VENDOR_SPEC,
+	  .bInterfaceSubClass	= 1,
+	  .bInterfaceProtocol	= 0 },
+	/* Logitech Quickcam Pro for Notebook */
+	{ .match_flags		= USB_DEVICE_ID_MATCH_DEVICE
+				| USB_DEVICE_ID_MATCH_INT_INFO,
+	  .idVendor		= 0x046d,
+	  .idProduct		= 0x08c3,
+	  .bInterfaceClass	= USB_CLASS_VENDOR_SPEC,
+	  .bInterfaceSubClass	= 1,
+	  .bInterfaceProtocol	= 0 },
+	/* Logitech Quickcam Pro 5000 */
+	{ .match_flags		= USB_DEVICE_ID_MATCH_DEVICE
+				| USB_DEVICE_ID_MATCH_INT_INFO,
+	  .idVendor		= 0x046d,
+	  .idProduct		= 0x08c5,
+	  .bInterfaceClass	= USB_CLASS_VENDOR_SPEC,
+	  .bInterfaceSubClass	= 1,
+	  .bInterfaceProtocol	= 0 },
+	/* Logitech Quickcam OEM Dell Notebook */
+	{ .match_flags		= USB_DEVICE_ID_MATCH_DEVICE
+				| USB_DEVICE_ID_MATCH_INT_INFO,
+	  .idVendor		= 0x046d,
+	  .idProduct		= 0x08c6,
+	  .bInterfaceClass	= USB_CLASS_VENDOR_SPEC,
+	  .bInterfaceSubClass	= 1,
+	  .bInterfaceProtocol	= 0 },
+	/* Logitech Quickcam OEM Cisco VT Camera II */
+	{ .match_flags		= USB_DEVICE_ID_MATCH_DEVICE
+				| USB_DEVICE_ID_MATCH_INT_INFO,
+	  .idVendor		= 0x046d,
+	  .idProduct		= 0x08c7,
+	  .bInterfaceClass	= USB_CLASS_VENDOR_SPEC,
+	  .bInterfaceSubClass	= 1,
+	  .bInterfaceProtocol	= 0 },
+	/* Apple Built-In iSight */
+	{ .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
+				| USB_DEVICE_ID_MATCH_INT_INFO,
+	  .idVendor		= 0x05ac,
+	  .idProduct		= 0x8501,
+	  .bInterfaceClass      = USB_CLASS_VIDEO,
+	  .bInterfaceSubClass   = 1,
+	  .bInterfaceProtocol   = 0,
+	  .driver_info 		= UVC_QUIRK_PROBE_MINMAX
+				| UVC_QUIRK_BUILTIN_ISIGHT },
+	/* Genesys Logic USB 2.0 PC Camera */
+	{ .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
+				| USB_DEVICE_ID_MATCH_INT_INFO,
+	  .idVendor             = 0x05e3,
+	  .idProduct            = 0x0505,
+	  .bInterfaceClass      = USB_CLASS_VIDEO,
+	  .bInterfaceSubClass   = 1,
+	  .bInterfaceProtocol   = 0,
+	  .driver_info          = UVC_QUIRK_STREAM_NO_FID },
+	/* Silicon Motion SM371 */
+	{ .match_flags		= USB_DEVICE_ID_MATCH_DEVICE
+				| USB_DEVICE_ID_MATCH_INT_INFO,
+	  .idVendor		= 0x090c,
+	  .idProduct		= 0xb371,
+	  .bInterfaceClass	= USB_CLASS_VIDEO,
+	  .bInterfaceSubClass	= 1,
+	  .bInterfaceProtocol	= 0,
+	  .driver_info		= UVC_QUIRK_PROBE_MINMAX },
+	/* MT6227 */
+	{ .match_flags		= USB_DEVICE_ID_MATCH_DEVICE
+				| USB_DEVICE_ID_MATCH_INT_INFO,
+	  .idVendor		= 0x0e8d,
+	  .idProduct		= 0x0004,
+	  .bInterfaceClass	= USB_CLASS_VIDEO,
+	  .bInterfaceSubClass	= 1,
+	  .bInterfaceProtocol	= 0,
+	  .driver_info		= UVC_QUIRK_PROBE_MINMAX },
+	/* Syntek (HP Spartan) */
+	{ .match_flags		= USB_DEVICE_ID_MATCH_DEVICE
+				| USB_DEVICE_ID_MATCH_INT_INFO,
+	  .idVendor		= 0x174f,
+	  .idProduct		= 0x5212,
+	  .bInterfaceClass	= USB_CLASS_VIDEO,
+	  .bInterfaceSubClass	= 1,
+	  .bInterfaceProtocol	= 0,
+	  .driver_info		= UVC_QUIRK_STREAM_NO_FID },
+	/* Syntek (Asus U3S) */
+	{ .match_flags		= USB_DEVICE_ID_MATCH_DEVICE
+				| USB_DEVICE_ID_MATCH_INT_INFO,
+	  .idVendor		= 0x174f,
+	  .idProduct		= 0x8a33,
+	  .bInterfaceClass	= USB_CLASS_VIDEO,
+	  .bInterfaceSubClass	= 1,
+	  .bInterfaceProtocol	= 0,
+	  .driver_info		= UVC_QUIRK_STREAM_NO_FID },
+	/* Ecamm Pico iMage */
+	{ .match_flags		= USB_DEVICE_ID_MATCH_DEVICE
+				| USB_DEVICE_ID_MATCH_INT_INFO,
+	  .idVendor		= 0x18cd,
+	  .idProduct		= 0xcafe,
+	  .bInterfaceClass	= USB_CLASS_VIDEO,
+	  .bInterfaceSubClass	= 1,
+	  .bInterfaceProtocol	= 0,
+	  .driver_info		= UVC_QUIRK_PROBE_EXTRAFIELDS },
+	/* Bodelin ProScopeHR */
+	{ .match_flags		= USB_DEVICE_ID_MATCH_DEVICE
+				| USB_DEVICE_ID_MATCH_DEV_HI
+				| USB_DEVICE_ID_MATCH_INT_INFO,
+	  .idVendor		= 0x19ab,
+	  .idProduct		= 0x1000,
+	  .bcdDevice_hi		= 0x0126,
+	  .bInterfaceClass	= USB_CLASS_VIDEO,
+	  .bInterfaceSubClass	= 1,
+	  .bInterfaceProtocol	= 0,
+	  .driver_info		= UVC_QUIRK_STATUS_INTERVAL },
+	/* SiGma Micro USB Web Camera */
+	{ .match_flags		= USB_DEVICE_ID_MATCH_DEVICE
+				| USB_DEVICE_ID_MATCH_INT_INFO,
+	  .idVendor		= 0x1c4f,
+	  .idProduct		= 0x3000,
+	  .bInterfaceClass	= USB_CLASS_VIDEO,
+	  .bInterfaceSubClass	= 1,
+	  .bInterfaceProtocol	= 0,
+	  .driver_info		= UVC_QUIRK_PROBE_MINMAX
+				| UVC_QUIRK_IGNORE_SELECTOR_UNIT},
+	/* Acer OEM Webcam - Unknown vendor */
+	{ .match_flags		= USB_DEVICE_ID_MATCH_DEVICE
+				| USB_DEVICE_ID_MATCH_INT_INFO,
+	  .idVendor		= 0x5986,
+	  .idProduct		= 0x0100,
+	  .bInterfaceClass	= USB_CLASS_VIDEO,
+	  .bInterfaceSubClass	= 1,
+	  .bInterfaceProtocol	= 0,
+	  .driver_info		= UVC_QUIRK_PROBE_MINMAX },
+	/* Packard Bell OEM Webcam */
+	{ .match_flags		= USB_DEVICE_ID_MATCH_DEVICE
+				| USB_DEVICE_ID_MATCH_INT_INFO,
+	  .idVendor		= 0x5986,
+	  .idProduct		= 0x0101,
+	  .bInterfaceClass	= USB_CLASS_VIDEO,
+	  .bInterfaceSubClass	= 1,
+	  .bInterfaceProtocol	= 0,
+	  .driver_info		= UVC_QUIRK_PROBE_MINMAX },
+	/* Acer Crystal Eye webcam */
+	{ .match_flags		= USB_DEVICE_ID_MATCH_DEVICE
+				| USB_DEVICE_ID_MATCH_INT_INFO,
+	  .idVendor		= 0x5986,
+	  .idProduct		= 0x0102,
+	  .bInterfaceClass	= USB_CLASS_VIDEO,
+	  .bInterfaceSubClass	= 1,
+	  .bInterfaceProtocol	= 0,
+	  .driver_info		= UVC_QUIRK_PROBE_MINMAX },
+	/* Acer OrbiCam - Unknown vendor */
+	{ .match_flags		= USB_DEVICE_ID_MATCH_DEVICE
+				| USB_DEVICE_ID_MATCH_INT_INFO,
+	  .idVendor		= 0x5986,
+	  .idProduct		= 0x0200,
+	  .bInterfaceClass	= USB_CLASS_VIDEO,
+	  .bInterfaceSubClass	= 1,
+	  .bInterfaceProtocol	= 0,
+	  .driver_info		= UVC_QUIRK_PROBE_MINMAX },
+	/* Generic USB Video Class */
+	{ USB_INTERFACE_INFO(USB_CLASS_VIDEO, 1, 0) },
+	{}
+};
+
+MODULE_DEVICE_TABLE(usb, uvc_ids);
+
+struct uvc_driver uvc_driver = {
+	.driver = {
+		.name		= "uvcvideo",
+		.probe		= uvc_probe,
+		.disconnect	= uvc_disconnect,
+		.suspend	= uvc_suspend,
+		.resume		= uvc_resume,
+		.id_table	= uvc_ids,
+		.supports_autosuspend = 1,
+	},
+};
+
+static int __init uvc_init(void)
+{
+	int result;
+
+	INIT_LIST_HEAD(&uvc_driver.devices);
+	INIT_LIST_HEAD(&uvc_driver.controls);
+	mutex_init(&uvc_driver.open_mutex);
+	mutex_init(&uvc_driver.ctrl_mutex);
+
+	uvc_ctrl_init();
+
+	result = usb_register(&uvc_driver.driver);
+	if (result == 0)
+		printk(KERN_INFO DRIVER_DESC " (" DRIVER_VERSION ")\n");
+	return result;
+}
+
+static void __exit uvc_cleanup(void)
+{
+	usb_deregister(&uvc_driver.driver);
+}
+
+module_init(uvc_init);
+module_exit(uvc_cleanup);
+
+module_param_named(quirks, uvc_quirks_param, uint, S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(quirks, "Forced device quirks");
+module_param_named(trace, uvc_trace_param, uint, S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(trace, "Trace level bitmask");
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRIVER_VERSION);
diff --git a/drivers/media/video/uvc/uvc_isight.c b/drivers/media/video/uvc/uvc_isight.c
new file mode 100644
index 00000000000..37bdefdbead
--- /dev/null
+++ b/drivers/media/video/uvc/uvc_isight.c
@@ -0,0 +1,134 @@
+/*
+ *      uvc_isight.c  --  USB Video Class driver - iSight support
+ *
+ *	Copyright (C) 2006-2007
+ *		Ivan N. Zlatev <contact@i-nz.net>
+ *
+ *      This program is free software; you can redistribute it and/or modify
+ *      it under the terms of the GNU General Public License as published by
+ *      the Free Software Foundation; either version 2 of the License, or
+ *      (at your option) any later version.
+ *
+ */
+
+#include <linux/usb.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+
+#include "uvcvideo.h"
+
+/* Built-in iSight webcams implements most of UVC 1.0 except a
+ * different packet format. Instead of sending a header at the
+ * beginning of each isochronous transfer payload, the webcam sends a
+ * single header per image (on its own in a packet), followed by
+ * packets containing data only.
+ *
+ * Offset   Size (bytes)	Description
+ * ------------------------------------------------------------------
+ * 0x00 	1   	Header length
+ * 0x01 	1   	Flags (UVC-compliant)
+ * 0x02 	4   	Always equal to '11223344'
+ * 0x06 	8   	Always equal to 'deadbeefdeadface'
+ * 0x0e 	16  	Unknown
+ *
+ * The header can be prefixed by an optional, unknown-purpose byte.
+ */
+
+static int isight_decode(struct uvc_video_queue *queue, struct uvc_buffer *buf,
+		const __u8 *data, unsigned int len)
+{
+	static const __u8 hdr[] = {
+		0x11, 0x22, 0x33, 0x44,
+		0xde, 0xad, 0xbe, 0xef,
+		0xde, 0xad, 0xfa, 0xce
+	};
+
+	unsigned int maxlen, nbytes;
+	__u8 *mem;
+	int is_header = 0;
+
+	if (buf == NULL)
+		return 0;
+
+	if ((len >= 14 && memcmp(&data[2], hdr, 12) == 0) ||
+	    (len >= 15 && memcmp(&data[3], hdr, 12) == 0)) {
+		uvc_trace(UVC_TRACE_FRAME, "iSight header found\n");
+		is_header = 1;
+	}
+
+	/* Synchronize to the input stream by waiting for a header packet. */
+	if (buf->state != UVC_BUF_STATE_ACTIVE) {
+		if (!is_header) {
+			uvc_trace(UVC_TRACE_FRAME, "Dropping packet (out of "
+				  "sync).\n");
+			return 0;
+		}
+
+		buf->state = UVC_BUF_STATE_ACTIVE;
+	}
+
+	/* Mark the buffer as done if we're at the beginning of a new frame.
+	 *
+	 * Empty buffers (bytesused == 0) don't trigger end of frame detection
+	 * as it doesn't make sense to return an empty buffer.
+	 */
+	if (is_header && buf->buf.bytesused != 0) {
+		buf->state = UVC_BUF_STATE_DONE;
+		return -EAGAIN;
+	}
+
+	/* Copy the video data to the buffer. Skip header packets, as they
+	 * contain no data.
+	 */
+	if (!is_header) {
+		maxlen = buf->buf.length - buf->buf.bytesused;
+		mem = queue->mem + buf->buf.m.offset + buf->buf.bytesused;
+		nbytes = min(len, maxlen);
+		memcpy(mem, data, nbytes);
+		buf->buf.bytesused += nbytes;
+
+		if (len > maxlen || buf->buf.bytesused == buf->buf.length) {
+			uvc_trace(UVC_TRACE_FRAME, "Frame complete "
+				  "(overflow).\n");
+			buf->state = UVC_BUF_STATE_DONE;
+		}
+	}
+
+	return 0;
+}
+
+void uvc_video_decode_isight(struct urb *urb, struct uvc_video_device *video,
+		struct uvc_buffer *buf)
+{
+	int ret, i;
+
+	for (i = 0; i < urb->number_of_packets; ++i) {
+		if (urb->iso_frame_desc[i].status < 0) {
+			uvc_trace(UVC_TRACE_FRAME, "USB isochronous frame "
+				  "lost (%d).\n",
+				  urb->iso_frame_desc[i].status);
+		}
+
+		/* Decode the payload packet.
+		 * uvc_video_decode is entered twice when a frame transition
+		 * has been detected because the end of frame can only be
+		 * reliably detected when the first packet of the new frame
+		 * is processed. The first pass detects the transition and
+		 * closes the previous frame's buffer, the second pass
+		 * processes the data of the first payload of the new frame.
+		 */
+		do {
+			ret = isight_decode(&video->queue, buf,
+					urb->transfer_buffer +
+					urb->iso_frame_desc[i].offset,
+					urb->iso_frame_desc[i].actual_length);
+
+			if (buf == NULL)
+				break;
+
+			if (buf->state == UVC_BUF_STATE_DONE ||
+			    buf->state == UVC_BUF_STATE_ERROR)
+				buf = uvc_queue_next_buffer(&video->queue, buf);
+		} while (ret == -EAGAIN);
+	}
+}
diff --git a/drivers/media/video/uvc/uvc_queue.c b/drivers/media/video/uvc/uvc_queue.c
new file mode 100644
index 00000000000..0923f0e3b3d
--- /dev/null
+++ b/drivers/media/video/uvc/uvc_queue.c
@@ -0,0 +1,477 @@
+/*
+ *      uvc_queue.c  --  USB Video Class driver - Buffers management
+ *
+ *      Copyright (C) 2005-2008
+ *          Laurent Pinchart (laurent.pinchart@skynet.be)
+ *
+ *      This program is free software; you can redistribute it and/or modify
+ *      it under the terms of the GNU General Public License as published by
+ *      the Free Software Foundation; either version 2 of the License, or
+ *      (at your option) any later version.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/version.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/usb.h>
+#include <linux/videodev2.h>
+#include <linux/vmalloc.h>
+#include <linux/wait.h>
+#include <asm/atomic.h>
+
+#include "uvcvideo.h"
+
+/* ------------------------------------------------------------------------
+ * Video buffers queue management.
+ *
+ * Video queues is initialized by uvc_queue_init(). The function performs
+ * basic initialization of the uvc_video_queue struct and never fails.
+ *
+ * Video buffer allocation and freeing are performed by uvc_alloc_buffers and
+ * uvc_free_buffers respectively. The former acquires the video queue lock,
+ * while the later must be called with the lock held (so that allocation can
+ * free previously allocated buffers). Trying to free buffers that are mapped
+ * to user space will return -EBUSY.
+ *
+ * Video buffers are managed using two queues. However, unlike most USB video
+ * drivers which use an in queue and an out queue, we use a main queue which
+ * holds all queued buffers (both 'empty' and 'done' buffers), and an irq
+ * queue which holds empty buffers. This design (copied from video-buf)
+ * minimizes locking in interrupt, as only one queue is shared between
+ * interrupt and user contexts.
+ *
+ * Use cases
+ * ---------
+ *
+ * Unless stated otherwise, all operations which modify the irq buffers queue
+ * are protected by the irq spinlock.
+ *
+ * 1. The user queues the buffers, starts streaming and dequeues a buffer.
+ *
+ *    The buffers are added to the main and irq queues. Both operations are
+ *    protected by the queue lock, and the latert is protected by the irq
+ *    spinlock as well.
+ *
+ *    The completion handler fetches a buffer from the irq queue and fills it
+ *    with video data. If no buffer is available (irq queue empty), the handler
+ *    returns immediately.
+ *
+ *    When the buffer is full, the completion handler removes it from the irq
+ *    queue, marks it as ready (UVC_BUF_STATE_DONE) and wake its wait queue.
+ *    At that point, any process waiting on the buffer will be woken up. If a
+ *    process tries to dequeue a buffer after it has been marked ready, the
+ *    dequeing will succeed immediately.
+ *
+ * 2. Buffers are queued, user is waiting on a buffer and the device gets
+ *    disconnected.
+ *
+ *    When the device is disconnected, the kernel calls the completion handler
+ *    with an appropriate status code. The handler marks all buffers in the
+ *    irq queue as being erroneous (UVC_BUF_STATE_ERROR) and wakes them up so
+ *    that any process waiting on a buffer gets woken up.
+ *
+ *    Waking up up the first buffer on the irq list is not enough, as the
+ *    process waiting on the buffer might restart the dequeue operation
+ *    immediately.
+ *
+ */
+
+void uvc_queue_init(struct uvc_video_queue *queue)
+{
+	mutex_init(&queue->mutex);
+	spin_lock_init(&queue->irqlock);
+	INIT_LIST_HEAD(&queue->mainqueue);
+	INIT_LIST_HEAD(&queue->irqqueue);
+}
+
+/*
+ * Allocate the video buffers.
+ *
+ * Pages are reserved to make sure they will not be swaped, as they will be
+ * filled in URB completion handler.
+ *
+ * Buffers will be individually mapped, so they must all be page aligned.
+ */
+int uvc_alloc_buffers(struct uvc_video_queue *queue, unsigned int nbuffers,
+		unsigned int buflength)
+{
+	unsigned int bufsize = PAGE_ALIGN(buflength);
+	unsigned int i;
+	void *mem = NULL;
+	int ret;
+
+	if (nbuffers > UVC_MAX_VIDEO_BUFFERS)
+		nbuffers = UVC_MAX_VIDEO_BUFFERS;
+
+	mutex_lock(&queue->mutex);
+
+	if ((ret = uvc_free_buffers(queue)) < 0)
+		goto done;
+
+	/* Bail out if no buffers should be allocated. */
+	if (nbuffers == 0)
+		goto done;
+
+	/* Decrement the number of buffers until allocation succeeds. */
+	for (; nbuffers > 0; --nbuffers) {
+		mem = vmalloc_32(nbuffers * bufsize);
+		if (mem != NULL)
+			break;
+	}
+
+	if (mem == NULL) {
+		ret = -ENOMEM;
+		goto done;
+	}
+
+	for (i = 0; i < nbuffers; ++i) {
+		memset(&queue->buffer[i], 0, sizeof queue->buffer[i]);
+		queue->buffer[i].buf.index = i;
+		queue->buffer[i].buf.m.offset = i * bufsize;
+		queue->buffer[i].buf.length = buflength;
+		queue->buffer[i].buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+		queue->buffer[i].buf.sequence = 0;
+		queue->buffer[i].buf.field = V4L2_FIELD_NONE;
+		queue->buffer[i].buf.memory = V4L2_MEMORY_MMAP;
+		queue->buffer[i].buf.flags = 0;
+		init_waitqueue_head(&queue->buffer[i].wait);
+	}
+
+	queue->mem = mem;
+	queue->count = nbuffers;
+	queue->buf_size = bufsize;
+	ret = nbuffers;
+
+done:
+	mutex_unlock(&queue->mutex);
+	return ret;
+}
+
+/*
+ * Free the video buffers.
+ *
+ * This function must be called with the queue lock held.
+ */
+int uvc_free_buffers(struct uvc_video_queue *queue)
+{
+	unsigned int i;
+
+	for (i = 0; i < queue->count; ++i) {
+		if (queue->buffer[i].vma_use_count != 0)
+			return -EBUSY;
+	}
+
+	if (queue->count) {
+		vfree(queue->mem);
+		queue->count = 0;
+	}
+
+	return 0;
+}
+
+static void __uvc_query_buffer(struct uvc_buffer *buf,
+		struct v4l2_buffer *v4l2_buf)
+{
+	memcpy(v4l2_buf, &buf->buf, sizeof *v4l2_buf);
+
+	if (buf->vma_use_count)
+		v4l2_buf->flags |= V4L2_BUF_FLAG_MAPPED;
+
+	switch (buf->state) {
+	case UVC_BUF_STATE_ERROR:
+	case UVC_BUF_STATE_DONE:
+		v4l2_buf->flags |= V4L2_BUF_FLAG_DONE;
+		break;
+	case UVC_BUF_STATE_QUEUED:
+	case UVC_BUF_STATE_ACTIVE:
+		v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
+		break;
+	case UVC_BUF_STATE_IDLE:
+	default:
+		break;
+	}
+}
+
+int uvc_query_buffer(struct uvc_video_queue *queue,
+		struct v4l2_buffer *v4l2_buf)
+{
+	int ret = 0;
+
+	mutex_lock(&queue->mutex);
+	if (v4l2_buf->index >= queue->count) {
+		ret = -EINVAL;
+		goto done;
+	}
+
+	__uvc_query_buffer(&queue->buffer[v4l2_buf->index], v4l2_buf);
+
+done:
+       mutex_unlock(&queue->mutex);
+       return ret;
+}
+
+/*
+ * Queue a video buffer. Attempting to queue a buffer that has already been
+ * queued will return -EINVAL.
+ */
+int uvc_queue_buffer(struct uvc_video_queue *queue,
+	struct v4l2_buffer *v4l2_buf)
+{
+	struct uvc_buffer *buf;
+	unsigned long flags;
+	int ret = 0;
+
+	uvc_trace(UVC_TRACE_CAPTURE, "Queuing buffer %u.\n", v4l2_buf->index);
+
+	if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
+	    v4l2_buf->memory != V4L2_MEMORY_MMAP) {
+		uvc_trace(UVC_TRACE_CAPTURE, "[E] Invalid buffer type (%u) "
+			"and/or memory (%u).\n", v4l2_buf->type,
+			v4l2_buf->memory);
+		return -EINVAL;
+	}
+
+	mutex_lock(&queue->mutex);
+	if (v4l2_buf->index >= queue->count)  {
+		uvc_trace(UVC_TRACE_CAPTURE, "[E] Out of range index.\n");
+		ret = -EINVAL;
+		goto done;
+	}
+
+	buf = &queue->buffer[v4l2_buf->index];
+	if (buf->state != UVC_BUF_STATE_IDLE) {
+		uvc_trace(UVC_TRACE_CAPTURE, "[E] Invalid buffer state "
+			"(%u).\n", buf->state);
+		ret = -EINVAL;
+		goto done;
+	}
+
+	spin_lock_irqsave(&queue->irqlock, flags);
+	if (queue->flags & UVC_QUEUE_DISCONNECTED) {
+		spin_unlock_irqrestore(&queue->irqlock, flags);
+		ret = -ENODEV;
+		goto done;
+	}
+	buf->state = UVC_BUF_STATE_QUEUED;
+	buf->buf.bytesused = 0;
+	list_add_tail(&buf->stream, &queue->mainqueue);
+	list_add_tail(&buf->queue, &queue->irqqueue);
+	spin_unlock_irqrestore(&queue->irqlock, flags);
+
+done:
+	mutex_unlock(&queue->mutex);
+	return ret;
+}
+
+static int uvc_queue_waiton(struct uvc_buffer *buf, int nonblocking)
+{
+	if (nonblocking) {
+		return (buf->state != UVC_BUF_STATE_QUEUED &&
+			buf->state != UVC_BUF_STATE_ACTIVE)
+			? 0 : -EAGAIN;
+	}
+
+	return wait_event_interruptible(buf->wait,
+		buf->state != UVC_BUF_STATE_QUEUED &&
+		buf->state != UVC_BUF_STATE_ACTIVE);
+}
+
+/*
+ * Dequeue a video buffer. If nonblocking is false, block until a buffer is
+ * available.
+ */
+int uvc_dequeue_buffer(struct uvc_video_queue *queue,
+		struct v4l2_buffer *v4l2_buf, int nonblocking)
+{
+	struct uvc_buffer *buf;
+	int ret = 0;
+
+	if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
+	    v4l2_buf->memory != V4L2_MEMORY_MMAP) {
+		uvc_trace(UVC_TRACE_CAPTURE, "[E] Invalid buffer type (%u) "
+			"and/or memory (%u).\n", v4l2_buf->type,
+			v4l2_buf->memory);
+		return -EINVAL;
+	}
+
+	mutex_lock(&queue->mutex);
+	if (list_empty(&queue->mainqueue)) {
+		uvc_trace(UVC_TRACE_CAPTURE, "[E] Empty buffer queue.\n");
+		ret = -EINVAL;
+		goto done;
+	}
+
+	buf = list_first_entry(&queue->mainqueue, struct uvc_buffer, stream);
+	if ((ret = uvc_queue_waiton(buf, nonblocking)) < 0)
+		goto done;
+
+	uvc_trace(UVC_TRACE_CAPTURE, "Dequeuing buffer %u (%u, %u bytes).\n",
+		buf->buf.index, buf->state, buf->buf.bytesused);
+
+	switch (buf->state) {
+	case UVC_BUF_STATE_ERROR:
+		uvc_trace(UVC_TRACE_CAPTURE, "[W] Corrupted data "
+			"(transmission error).\n");
+		ret = -EIO;
+	case UVC_BUF_STATE_DONE:
+		buf->state = UVC_BUF_STATE_IDLE;
+		break;
+
+	case UVC_BUF_STATE_IDLE:
+	case UVC_BUF_STATE_QUEUED:
+	case UVC_BUF_STATE_ACTIVE:
+	default:
+		uvc_trace(UVC_TRACE_CAPTURE, "[E] Invalid buffer state %u "
+			"(driver bug?).\n", buf->state);
+		ret = -EINVAL;
+		goto done;
+	}
+
+	list_del(&buf->stream);
+	__uvc_query_buffer(buf, v4l2_buf);
+
+done:
+	mutex_unlock(&queue->mutex);
+	return ret;
+}
+
+/*
+ * Poll the video queue.
+ *
+ * This function implements video queue polling and is intended to be used by
+ * the device poll handler.
+ */
+unsigned int uvc_queue_poll(struct uvc_video_queue *queue, struct file *file,
+		poll_table *wait)
+{
+	struct uvc_buffer *buf;
+	unsigned int mask = 0;
+
+	mutex_lock(&queue->mutex);
+	if (list_empty(&queue->mainqueue)) {
+		mask |= POLLERR;
+		goto done;
+	}
+	buf = list_first_entry(&queue->mainqueue, struct uvc_buffer, stream);
+
+	poll_wait(file, &buf->wait, wait);
+	if (buf->state == UVC_BUF_STATE_DONE ||
+	    buf->state == UVC_BUF_STATE_ERROR)
+		mask |= POLLIN | POLLRDNORM;
+
+done:
+	mutex_unlock(&queue->mutex);
+	return mask;
+}
+
+/*
+ * Enable or disable the video buffers queue.
+ *
+ * The queue must be enabled before starting video acquisition and must be
+ * disabled after stopping it. This ensures that the video buffers queue
+ * state can be properly initialized before buffers are accessed from the
+ * interrupt handler.
+ *
+ * Enabling the video queue initializes parameters (such as sequence number,
+ * sync pattern, ...). If the queue is already enabled, return -EBUSY.
+ *
+ * Disabling the video queue cancels the queue and removes all buffers from
+ * the main queue.
+ *
+ * This function can't be called from interrupt context. Use
+ * uvc_queue_cancel() instead.
+ */
+int uvc_queue_enable(struct uvc_video_queue *queue, int enable)
+{
+	unsigned int i;
+	int ret = 0;
+
+	mutex_lock(&queue->mutex);
+	if (enable) {
+		if (uvc_queue_streaming(queue)) {
+			ret = -EBUSY;
+			goto done;
+		}
+		queue->sequence = 0;
+		queue->flags |= UVC_QUEUE_STREAMING;
+	} else {
+		uvc_queue_cancel(queue, 0);
+		INIT_LIST_HEAD(&queue->mainqueue);
+
+		for (i = 0; i < queue->count; ++i)
+			queue->buffer[i].state = UVC_BUF_STATE_IDLE;
+
+		queue->flags &= ~UVC_QUEUE_STREAMING;
+	}
+
+done:
+	mutex_unlock(&queue->mutex);
+	return ret;
+}
+
+/*
+ * Cancel the video buffers queue.
+ *
+ * Cancelling the queue marks all buffers on the irq queue as erroneous,
+ * wakes them up and remove them from the queue.
+ *
+ * If the disconnect parameter is set, further calls to uvc_queue_buffer will
+ * fail with -ENODEV.
+ *
+ * This function acquires the irq spinlock and can be called from interrupt
+ * context.
+ */
+void uvc_queue_cancel(struct uvc_video_queue *queue, int disconnect)
+{
+	struct uvc_buffer *buf;
+	unsigned long flags;
+
+	spin_lock_irqsave(&queue->irqlock, flags);
+	while (!list_empty(&queue->irqqueue)) {
+		buf = list_first_entry(&queue->irqqueue, struct uvc_buffer,
+				       queue);
+		list_del(&buf->queue);
+		buf->state = UVC_BUF_STATE_ERROR;
+		wake_up(&buf->wait);
+	}
+	/* This must be protected by the irqlock spinlock to avoid race
+	 * conditions between uvc_queue_buffer and the disconnection event that
+	 * could result in an interruptible wait in uvc_dequeue_buffer. Do not
+	 * blindly replace this logic by checking for the UVC_DEV_DISCONNECTED
+	 * state outside the queue code.
+	 */
+	if (disconnect)
+		queue->flags |= UVC_QUEUE_DISCONNECTED;
+	spin_unlock_irqrestore(&queue->irqlock, flags);
+}
+
+struct uvc_buffer *uvc_queue_next_buffer(struct uvc_video_queue *queue,
+		struct uvc_buffer *buf)
+{
+	struct uvc_buffer *nextbuf;
+	unsigned long flags;
+
+	if ((queue->flags & UVC_QUEUE_DROP_INCOMPLETE) &&
+	    buf->buf.length != buf->buf.bytesused) {
+		buf->state = UVC_BUF_STATE_QUEUED;
+		buf->buf.bytesused = 0;
+		return buf;
+	}
+
+	spin_lock_irqsave(&queue->irqlock, flags);
+	list_del(&buf->queue);
+	if (!list_empty(&queue->irqqueue))
+		nextbuf = list_first_entry(&queue->irqqueue, struct uvc_buffer,
+					   queue);
+	else
+		nextbuf = NULL;
+	spin_unlock_irqrestore(&queue->irqlock, flags);
+
+	buf->buf.sequence = queue->sequence++;
+	do_gettimeofday(&buf->buf.timestamp);
+
+	wake_up(&buf->wait);
+	return nextbuf;
+}
diff --git a/drivers/media/video/uvc/uvc_status.c b/drivers/media/video/uvc/uvc_status.c
new file mode 100644
index 00000000000..be9084e5eac
--- /dev/null
+++ b/drivers/media/video/uvc/uvc_status.c
@@ -0,0 +1,207 @@
+/*
+ *      uvc_status.c  --  USB Video Class driver - Status endpoint
+ *
+ *      Copyright (C) 2007-2008
+ *          Laurent Pinchart (laurent.pinchart@skynet.be)
+ *
+ *      This program is free software; you can redistribute it and/or modify
+ *      it under the terms of the GNU General Public License as published by
+ *      the Free Software Foundation; either version 2 of the License, or
+ *      (at your option) any later version.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/version.h>
+#include <linux/input.h>
+#include <linux/usb.h>
+#include <linux/usb/input.h>
+
+#include "uvcvideo.h"
+
+/* --------------------------------------------------------------------------
+ * Input device
+ */
+static int uvc_input_init(struct uvc_device *dev)
+{
+	struct usb_device *udev = dev->udev;
+	struct input_dev *input;
+	char *phys = NULL;
+	int ret;
+
+	input = input_allocate_device();
+	if (input == NULL)
+		return -ENOMEM;
+
+	phys = kmalloc(6 + strlen(udev->bus->bus_name) + strlen(udev->devpath),
+			GFP_KERNEL);
+	if (phys == NULL) {
+		ret = -ENOMEM;
+		goto error;
+	}
+	sprintf(phys, "usb-%s-%s", udev->bus->bus_name, udev->devpath);
+
+	input->name = dev->name;
+	input->phys = phys;
+	usb_to_input_id(udev, &input->id);
+	input->dev.parent = &dev->intf->dev;
+
+	set_bit(EV_KEY, input->evbit);
+	set_bit(BTN_0, input->keybit);
+
+	if ((ret = input_register_device(input)) < 0)
+		goto error;
+
+	dev->input = input;
+	return 0;
+
+error:
+	input_free_device(input);
+	kfree(phys);
+	return ret;
+}
+
+static void uvc_input_cleanup(struct uvc_device *dev)
+{
+	if (dev->input)
+		input_unregister_device(dev->input);
+}
+
+/* --------------------------------------------------------------------------
+ * Status interrupt endpoint
+ */
+static void uvc_event_streaming(struct uvc_device *dev, __u8 *data, int len)
+{
+	if (len < 3) {
+		uvc_trace(UVC_TRACE_STATUS, "Invalid streaming status event "
+				"received.\n");
+		return;
+	}
+
+	if (data[2] == 0) {
+		if (len < 4)
+			return;
+		uvc_trace(UVC_TRACE_STATUS, "Button (intf %u) %s len %d\n",
+			data[1], data[3] ? "pressed" : "released", len);
+		if (dev->input)
+			input_report_key(dev->input, BTN_0, data[3]);
+	} else {
+		uvc_trace(UVC_TRACE_STATUS, "Stream %u error event %02x %02x "
+			"len %d.\n", data[1], data[2], data[3], len);
+	}
+}
+
+static void uvc_event_control(struct uvc_device *dev, __u8 *data, int len)
+{
+	char *attrs[3] = { "value", "info", "failure" };
+
+	if (len < 6 || data[2] != 0 || data[4] > 2) {
+		uvc_trace(UVC_TRACE_STATUS, "Invalid control status event "
+				"received.\n");
+		return;
+	}
+
+	uvc_trace(UVC_TRACE_STATUS, "Control %u/%u %s change len %d.\n",
+		data[1], data[3], attrs[data[4]], len);
+}
+
+static void uvc_status_complete(struct urb *urb)
+{
+	struct uvc_device *dev = urb->context;
+	int len, ret;
+
+	switch (urb->status) {
+	case 0:
+		break;
+
+	case -ENOENT:		/* usb_kill_urb() called. */
+	case -ECONNRESET:	/* usb_unlink_urb() called. */
+	case -ESHUTDOWN:	/* The endpoint is being disabled. */
+	case -EPROTO:		/* Device is disconnected (reported by some
+				 * host controller). */
+		return;
+
+	default:
+		uvc_printk(KERN_WARNING, "Non-zero status (%d) in status "
+			"completion handler.\n", urb->status);
+		return;
+	}
+
+	len = urb->actual_length;
+	if (len > 0) {
+		switch (dev->status[0] & 0x0f) {
+		case UVC_STATUS_TYPE_CONTROL:
+			uvc_event_control(dev, dev->status, len);
+			break;
+
+		case UVC_STATUS_TYPE_STREAMING:
+			uvc_event_streaming(dev, dev->status, len);
+			break;
+
+		default:
+			uvc_printk(KERN_INFO, "unknown event type %u.\n",
+				dev->status[0]);
+			break;
+		}
+	}
+
+	/* Resubmit the URB. */
+	urb->interval = dev->int_ep->desc.bInterval;
+	if ((ret = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
+		uvc_printk(KERN_ERR, "Failed to resubmit status URB (%d).\n",
+			ret);
+	}
+}
+
+int uvc_status_init(struct uvc_device *dev)
+{
+	struct usb_host_endpoint *ep = dev->int_ep;
+	unsigned int pipe;
+	int interval;
+
+	if (ep == NULL)
+		return 0;
+
+	uvc_input_init(dev);
+
+	dev->int_urb = usb_alloc_urb(0, GFP_KERNEL);
+	if (dev->int_urb == NULL)
+		return -ENOMEM;
+
+	pipe = usb_rcvintpipe(dev->udev, ep->desc.bEndpointAddress);
+
+	/* For high-speed interrupt endpoints, the bInterval value is used as
+	 * an exponent of two. Some developers forgot about it.
+	 */
+	interval = ep->desc.bInterval;
+	if (interval > 16 && dev->udev->speed == USB_SPEED_HIGH &&
+	    (dev->quirks & UVC_QUIRK_STATUS_INTERVAL))
+		interval = fls(interval) - 1;
+
+	usb_fill_int_urb(dev->int_urb, dev->udev, pipe,
+		dev->status, sizeof dev->status, uvc_status_complete,
+		dev, interval);
+
+	return usb_submit_urb(dev->int_urb, GFP_KERNEL);
+}
+
+void uvc_status_cleanup(struct uvc_device *dev)
+{
+	usb_kill_urb(dev->int_urb);
+	usb_free_urb(dev->int_urb);
+	uvc_input_cleanup(dev);
+}
+
+int uvc_status_suspend(struct uvc_device *dev)
+{
+	usb_kill_urb(dev->int_urb);
+	return 0;
+}
+
+int uvc_status_resume(struct uvc_device *dev)
+{
+	if (dev->int_urb == NULL)
+		return 0;
+
+	return usb_submit_urb(dev->int_urb, GFP_KERNEL);
+}
diff --git a/drivers/media/video/uvc/uvc_v4l2.c b/drivers/media/video/uvc/uvc_v4l2.c
new file mode 100644
index 00000000000..2e0a66575bb
--- /dev/null
+++ b/drivers/media/video/uvc/uvc_v4l2.c
@@ -0,0 +1,1105 @@
+/*
+ *      uvc_v4l2.c  --  USB Video Class driver - V4L2 API
+ *
+ *      Copyright (C) 2005-2008
+ *          Laurent Pinchart (laurent.pinchart@skynet.be)
+ *
+ *      This program is free software; you can redistribute it and/or modify
+ *      it under the terms of the GNU General Public License as published by
+ *      the Free Software Foundation; either version 2 of the License, or
+ *      (at your option) any later version.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/version.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/usb.h>
+#include <linux/videodev2.h>
+#include <linux/vmalloc.h>
+#include <linux/mm.h>
+#include <linux/wait.h>
+#include <asm/atomic.h>
+
+#include <media/v4l2-common.h>
+
+#include "uvcvideo.h"
+
+/* ------------------------------------------------------------------------
+ * V4L2 interface
+ */
+
+/*
+ * Mapping V4L2 controls to UVC controls can be straighforward if done well.
+ * Most of the UVC controls exist in V4L2, and can be mapped directly. Some
+ * must be grouped (for instance the Red Balance, Blue Balance and Do White
+ * Balance V4L2 controls use the White Balance Component UVC control) or
+ * otherwise translated. The approach we take here is to use a translation
+ * table for the controls which can be mapped directly, and handle the others
+ * manually.
+ */
+static int uvc_v4l2_query_menu(struct uvc_video_device *video,
+	struct v4l2_querymenu *query_menu)
+{
+	struct uvc_menu_info *menu_info;
+	struct uvc_control_mapping *mapping;
+	struct uvc_control *ctrl;
+
+	ctrl = uvc_find_control(video, query_menu->id, &mapping);
+	if (ctrl == NULL || mapping->v4l2_type != V4L2_CTRL_TYPE_MENU)
+		return -EINVAL;
+
+	if (query_menu->index >= mapping->menu_count)
+		return -EINVAL;
+
+	menu_info = &mapping->menu_info[query_menu->index];
+	strncpy(query_menu->name, menu_info->name, 32);
+	return 0;
+}
+
+/*
+ * Find the frame interval closest to the requested frame interval for the
+ * given frame format and size. This should be done by the device as part of
+ * the Video Probe and Commit negotiation, but some hardware don't implement
+ * that feature.
+ */
+static __u32 uvc_try_frame_interval(struct uvc_frame *frame, __u32 interval)
+{
+	unsigned int i;
+
+	if (frame->bFrameIntervalType) {
+		__u32 best = -1, dist;
+
+		for (i = 0; i < frame->bFrameIntervalType; ++i) {
+			dist = interval > frame->dwFrameInterval[i]
+			     ? interval - frame->dwFrameInterval[i]
+			     : frame->dwFrameInterval[i] - interval;
+
+			if (dist > best)
+				break;
+
+			best = dist;
+		}
+
+		interval = frame->dwFrameInterval[i-1];
+	} else {
+		const __u32 min = frame->dwFrameInterval[0];
+		const __u32 max = frame->dwFrameInterval[1];
+		const __u32 step = frame->dwFrameInterval[2];
+
+		interval = min + (interval - min + step/2) / step * step;
+		if (interval > max)
+			interval = max;
+	}
+
+	return interval;
+}
+
+static int uvc_v4l2_try_format(struct uvc_video_device *video,
+	struct v4l2_format *fmt, struct uvc_streaming_control *probe,
+	struct uvc_format **uvc_format, struct uvc_frame **uvc_frame)
+{
+	struct uvc_format *format = NULL;
+	struct uvc_frame *frame = NULL;
+	__u16 rw, rh;
+	unsigned int d, maxd;
+	unsigned int i;
+	__u32 interval;
+	int ret = 0;
+	__u8 *fcc;
+
+	if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return -EINVAL;
+
+	fcc = (__u8 *)&fmt->fmt.pix.pixelformat;
+	uvc_trace(UVC_TRACE_FORMAT, "Trying format 0x%08x (%c%c%c%c): %ux%u.\n",
+			fmt->fmt.pix.pixelformat,
+			fcc[0], fcc[1], fcc[2], fcc[3],
+			fmt->fmt.pix.width, fmt->fmt.pix.height);
+
+	/* Check if the hardware supports the requested format. */
+	for (i = 0; i < video->streaming->nformats; ++i) {
+		format = &video->streaming->format[i];
+		if (format->fcc == fmt->fmt.pix.pixelformat)
+			break;
+	}
+
+	if (format == NULL || format->fcc != fmt->fmt.pix.pixelformat) {
+		uvc_trace(UVC_TRACE_FORMAT, "Unsupported format 0x%08x.\n",
+				fmt->fmt.pix.pixelformat);
+		return -EINVAL;
+	}
+
+	/* Find the closest image size. The distance between image sizes is
+	 * the size in pixels of the non-overlapping regions between the
+	 * requested size and the frame-specified size.
+	 */
+	rw = fmt->fmt.pix.width;
+	rh = fmt->fmt.pix.height;
+	maxd = (unsigned int)-1;
+
+	for (i = 0; i < format->nframes; ++i) {
+		__u16 w = format->frame[i].wWidth;
+		__u16 h = format->frame[i].wHeight;
+
+		d = min(w, rw) * min(h, rh);
+		d = w*h + rw*rh - 2*d;
+		if (d < maxd) {
+			maxd = d;
+			frame = &format->frame[i];
+		}
+
+		if (maxd == 0)
+			break;
+	}
+
+	if (frame == NULL) {
+		uvc_trace(UVC_TRACE_FORMAT, "Unsupported size %ux%u.\n",
+				fmt->fmt.pix.width, fmt->fmt.pix.height);
+		return -EINVAL;
+	}
+
+	/* Use the default frame interval. */
+	interval = frame->dwDefaultFrameInterval;
+	uvc_trace(UVC_TRACE_FORMAT, "Using default frame interval %u.%u us "
+		"(%u.%u fps).\n", interval/10, interval%10, 10000000/interval,
+		(100000000/interval)%10);
+
+	/* Set the format index, frame index and frame interval. */
+	memset(probe, 0, sizeof *probe);
+	probe->bmHint = 1;	/* dwFrameInterval */
+	probe->bFormatIndex = format->index;
+	probe->bFrameIndex = frame->bFrameIndex;
+	probe->dwFrameInterval = uvc_try_frame_interval(frame, interval);
+	/* Some webcams stall the probe control set request when the
+	 * dwMaxVideoFrameSize field is set to zero. The UVC specification
+	 * clearly states that the field is read-only from the host, so this
+	 * is a webcam bug. Set dwMaxVideoFrameSize to the value reported by
+	 * the webcam to work around the problem.
+	 *
+	 * The workaround could probably be enabled for all webcams, so the
+	 * quirk can be removed if needed. It's currently useful to detect
+	 * webcam bugs and fix them before they hit the market (providing
+	 * developers test their webcams with the Linux driver as well as with
+	 * the Windows driver).
+	 */
+	if (video->dev->quirks & UVC_QUIRK_PROBE_EXTRAFIELDS)
+		probe->dwMaxVideoFrameSize =
+			video->streaming->ctrl.dwMaxVideoFrameSize;
+
+	/* Probe the device */
+	if ((ret = uvc_probe_video(video, probe)) < 0)
+		goto done;
+
+	fmt->fmt.pix.width = frame->wWidth;
+	fmt->fmt.pix.height = frame->wHeight;
+	fmt->fmt.pix.field = V4L2_FIELD_NONE;
+	fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8;
+	fmt->fmt.pix.sizeimage = probe->dwMaxVideoFrameSize;
+	fmt->fmt.pix.colorspace = format->colorspace;
+	fmt->fmt.pix.priv = 0;
+
+	if (uvc_format != NULL)
+		*uvc_format = format;
+	if (uvc_frame != NULL)
+		*uvc_frame = frame;
+
+done:
+	return ret;
+}
+
+static int uvc_v4l2_get_format(struct uvc_video_device *video,
+	struct v4l2_format *fmt)
+{
+	struct uvc_format *format = video->streaming->cur_format;
+	struct uvc_frame *frame = video->streaming->cur_frame;
+
+	if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return -EINVAL;
+
+	if (format == NULL || frame == NULL)
+		return -EINVAL;
+
+	fmt->fmt.pix.pixelformat = format->fcc;
+	fmt->fmt.pix.width = frame->wWidth;
+	fmt->fmt.pix.height = frame->wHeight;
+	fmt->fmt.pix.field = V4L2_FIELD_NONE;
+	fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth / 8;
+	fmt->fmt.pix.sizeimage = video->streaming->ctrl.dwMaxVideoFrameSize;
+	fmt->fmt.pix.colorspace = format->colorspace;
+	fmt->fmt.pix.priv = 0;
+
+	return 0;
+}
+
+static int uvc_v4l2_set_format(struct uvc_video_device *video,
+	struct v4l2_format *fmt)
+{
+	struct uvc_streaming_control probe;
+	struct uvc_format *format;
+	struct uvc_frame *frame;
+	int ret;
+
+	if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return -EINVAL;
+
+	if (uvc_queue_streaming(&video->queue))
+		return -EBUSY;
+
+	ret = uvc_v4l2_try_format(video, fmt, &probe, &format, &frame);
+	if (ret < 0)
+		return ret;
+
+	if ((ret = uvc_set_video_ctrl(video, &probe, 0)) < 0)
+		return ret;
+
+	memcpy(&video->streaming->ctrl, &probe, sizeof probe);
+	video->streaming->cur_format = format;
+	video->streaming->cur_frame = frame;
+
+	return 0;
+}
+
+static int uvc_v4l2_get_streamparm(struct uvc_video_device *video,
+		struct v4l2_streamparm *parm)
+{
+	uint32_t numerator, denominator;
+
+	if (parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return -EINVAL;
+
+	numerator = video->streaming->ctrl.dwFrameInterval;
+	denominator = 10000000;
+	uvc_simplify_fraction(&numerator, &denominator, 8, 333);
+
+	memset(parm, 0, sizeof *parm);
+	parm->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+	parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
+	parm->parm.capture.capturemode = 0;
+	parm->parm.capture.timeperframe.numerator = numerator;
+	parm->parm.capture.timeperframe.denominator = denominator;
+	parm->parm.capture.extendedmode = 0;
+	parm->parm.capture.readbuffers = 0;
+
+	return 0;
+}
+
+static int uvc_v4l2_set_streamparm(struct uvc_video_device *video,
+		struct v4l2_streamparm *parm)
+{
+	struct uvc_frame *frame = video->streaming->cur_frame;
+	struct uvc_streaming_control probe;
+	uint32_t interval;
+	int ret;
+
+	if (parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return -EINVAL;
+
+	if (uvc_queue_streaming(&video->queue))
+		return -EBUSY;
+
+	memcpy(&probe, &video->streaming->ctrl, sizeof probe);
+	interval = uvc_fraction_to_interval(
+			parm->parm.capture.timeperframe.numerator,
+			parm->parm.capture.timeperframe.denominator);
+
+	uvc_trace(UVC_TRACE_FORMAT, "Setting frame interval to %u/%u (%u).\n",
+			parm->parm.capture.timeperframe.numerator,
+			parm->parm.capture.timeperframe.denominator,
+			interval);
+	probe.dwFrameInterval = uvc_try_frame_interval(frame, interval);
+
+	/* Probe the device with the new settings. */
+	if ((ret = uvc_probe_video(video, &probe)) < 0)
+		return ret;
+
+	/* Commit the new settings. */
+	if ((ret = uvc_set_video_ctrl(video, &probe, 0)) < 0)
+		return ret;
+
+	memcpy(&video->streaming->ctrl, &probe, sizeof probe);
+
+	/* Return the actual frame period. */
+	parm->parm.capture.timeperframe.numerator = probe.dwFrameInterval;
+	parm->parm.capture.timeperframe.denominator = 10000000;
+	uvc_simplify_fraction(&parm->parm.capture.timeperframe.numerator,
+				&parm->parm.capture.timeperframe.denominator,
+				8, 333);
+
+	return 0;
+}
+
+/* ------------------------------------------------------------------------
+ * Privilege management
+ */
+
+/*
+ * Privilege management is the multiple-open implementation basis. The current
+ * implementation is completely transparent for the end-user and doesn't
+ * require explicit use of the VIDIOC_G_PRIORITY and VIDIOC_S_PRIORITY ioctls.
+ * Those ioctls enable finer control on the device (by making possible for a
+ * user to request exclusive access to a device), but are not mature yet.
+ * Switching to the V4L2 priority mechanism might be considered in the future
+ * if this situation changes.
+ *
+ * Each open instance of a UVC device can either be in a privileged or
+ * unprivileged state. Only a single instance can be in a privileged state at
+ * a given time. Trying to perform an operation which requires privileges will
+ * automatically acquire the required privileges if possible, or return -EBUSY
+ * otherwise. Privileges are dismissed when closing the instance.
+ *
+ * Operations which require privileges are:
+ *
+ * - VIDIOC_S_INPUT
+ * - VIDIOC_S_PARM
+ * - VIDIOC_S_FMT
+ * - VIDIOC_TRY_FMT
+ * - VIDIOC_REQBUFS
+ */
+static int uvc_acquire_privileges(struct uvc_fh *handle)
+{
+	int ret = 0;
+
+	/* Always succeed if the handle is already privileged. */
+	if (handle->state == UVC_HANDLE_ACTIVE)
+		return 0;
+
+	/* Check if the device already has a privileged handle. */
+	mutex_lock(&uvc_driver.open_mutex);
+	if (atomic_inc_return(&handle->device->active) != 1) {
+		atomic_dec(&handle->device->active);
+		ret = -EBUSY;
+		goto done;
+	}
+
+	handle->state = UVC_HANDLE_ACTIVE;
+
+done:
+	mutex_unlock(&uvc_driver.open_mutex);
+	return ret;
+}
+
+static void uvc_dismiss_privileges(struct uvc_fh *handle)
+{
+	if (handle->state == UVC_HANDLE_ACTIVE)
+		atomic_dec(&handle->device->active);
+
+	handle->state = UVC_HANDLE_PASSIVE;
+}
+
+static int uvc_has_privileges(struct uvc_fh *handle)
+{
+	return handle->state == UVC_HANDLE_ACTIVE;
+}
+
+/* ------------------------------------------------------------------------
+ * V4L2 file operations
+ */
+
+static int uvc_v4l2_open(struct inode *inode, struct file *file)
+{
+	struct video_device *vdev;
+	struct uvc_video_device *video;
+	struct uvc_fh *handle;
+	int ret = 0;
+
+	uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_open\n");
+	mutex_lock(&uvc_driver.open_mutex);
+	vdev = video_devdata(file);
+	video = video_get_drvdata(vdev);
+
+	if (video->dev->state & UVC_DEV_DISCONNECTED) {
+		ret = -ENODEV;
+		goto done;
+	}
+
+	ret = usb_autopm_get_interface(video->dev->intf);
+	if (ret < 0)
+		goto done;
+
+	/* Create the device handle. */
+	handle = kzalloc(sizeof *handle, GFP_KERNEL);
+	if (handle == NULL) {
+		usb_autopm_put_interface(video->dev->intf);
+		ret = -ENOMEM;
+		goto done;
+	}
+
+	handle->device = video;
+	handle->state = UVC_HANDLE_PASSIVE;
+	file->private_data = handle;
+
+	kref_get(&video->dev->kref);
+
+done:
+	mutex_unlock(&uvc_driver.open_mutex);
+	return ret;
+}
+
+static int uvc_v4l2_release(struct inode *inode, struct file *file)
+{
+	struct video_device *vdev = video_devdata(file);
+	struct uvc_video_device *video = video_get_drvdata(vdev);
+	struct uvc_fh *handle = (struct uvc_fh *)file->private_data;
+
+	uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_release\n");
+
+	/* Only free resources if this is a privileged handle. */
+	if (uvc_has_privileges(handle)) {
+		uvc_video_enable(video, 0);
+
+		mutex_lock(&video->queue.mutex);
+		if (uvc_free_buffers(&video->queue) < 0)
+			uvc_printk(KERN_ERR, "uvc_v4l2_release: Unable to "
+					"free buffers.\n");
+		mutex_unlock(&video->queue.mutex);
+	}
+
+	/* Release the file handle. */
+	uvc_dismiss_privileges(handle);
+	kfree(handle);
+	file->private_data = NULL;
+
+	usb_autopm_put_interface(video->dev->intf);
+	kref_put(&video->dev->kref, uvc_delete);
+	return 0;
+}
+
+static int uvc_v4l2_do_ioctl(struct inode *inode, struct file *file,
+		     unsigned int cmd, void *arg)
+{
+	struct video_device *vdev = video_devdata(file);
+	struct uvc_video_device *video = video_get_drvdata(vdev);
+	struct uvc_fh *handle = (struct uvc_fh *)file->private_data;
+	int ret = 0;
+
+	if (uvc_trace_param & UVC_TRACE_IOCTL)
+		v4l_printk_ioctl(cmd);
+
+	switch (cmd) {
+	/* Query capabilities */
+	case VIDIOC_QUERYCAP:
+	{
+		struct v4l2_capability *cap = arg;
+
+		memset(cap, 0, sizeof *cap);
+		strncpy(cap->driver, "uvcvideo", sizeof cap->driver);
+		strncpy(cap->card, vdev->name, 32);
+		strncpy(cap->bus_info, video->dev->udev->bus->bus_name,
+			sizeof cap->bus_info);
+		cap->version = DRIVER_VERSION_NUMBER;
+		cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
+				  | V4L2_CAP_STREAMING;
+		break;
+	}
+
+	/* Get, Set & Query control */
+	case VIDIOC_QUERYCTRL:
+		return uvc_query_v4l2_ctrl(video, arg);
+
+	case VIDIOC_G_CTRL:
+	{
+		struct v4l2_control *ctrl = arg;
+		struct v4l2_ext_control xctrl;
+
+		memset(&xctrl, 0, sizeof xctrl);
+		xctrl.id = ctrl->id;
+
+		uvc_ctrl_begin(video);
+		ret = uvc_ctrl_get(video, &xctrl);
+		uvc_ctrl_rollback(video);
+		if (ret >= 0)
+			ctrl->value = xctrl.value;
+		break;
+	}
+
+	case VIDIOC_S_CTRL:
+	{
+		struct v4l2_control *ctrl = arg;
+		struct v4l2_ext_control xctrl;
+
+		memset(&xctrl, 0, sizeof xctrl);
+		xctrl.id = ctrl->id;
+		xctrl.value = ctrl->value;
+
+		uvc_ctrl_begin(video);
+		ret = uvc_ctrl_set(video, &xctrl);
+		if (ret < 0) {
+			uvc_ctrl_rollback(video);
+			return ret;
+		}
+		ret = uvc_ctrl_commit(video);
+		break;
+	}
+
+	case VIDIOC_QUERYMENU:
+		return uvc_v4l2_query_menu(video, arg);
+
+	case VIDIOC_G_EXT_CTRLS:
+	{
+		struct v4l2_ext_controls *ctrls = arg;
+		struct v4l2_ext_control *ctrl = ctrls->controls;
+		unsigned int i;
+
+		uvc_ctrl_begin(video);
+		for (i = 0; i < ctrls->count; ++ctrl, ++i) {
+			ret = uvc_ctrl_get(video, ctrl);
+			if (ret < 0) {
+				uvc_ctrl_rollback(video);
+				ctrls->error_idx = i;
+				return ret;
+			}
+		}
+		ctrls->error_idx = 0;
+		ret = uvc_ctrl_rollback(video);
+		break;
+	}
+
+	case VIDIOC_S_EXT_CTRLS:
+	case VIDIOC_TRY_EXT_CTRLS:
+	{
+		struct v4l2_ext_controls *ctrls = arg;
+		struct v4l2_ext_control *ctrl = ctrls->controls;
+		unsigned int i;
+
+		ret = uvc_ctrl_begin(video);
+		if (ret < 0)
+			return ret;
+
+		for (i = 0; i < ctrls->count; ++ctrl, ++i) {
+			ret = uvc_ctrl_set(video, ctrl);
+			if (ret < 0) {
+				uvc_ctrl_rollback(video);
+				ctrls->error_idx = i;
+				return ret;
+			}
+		}
+
+		ctrls->error_idx = 0;
+
+		if (cmd == VIDIOC_S_EXT_CTRLS)
+			ret = uvc_ctrl_commit(video);
+		else
+			ret = uvc_ctrl_rollback(video);
+		break;
+	}
+
+	/* Get, Set & Enum input */
+	case VIDIOC_ENUMINPUT:
+	{
+		const struct uvc_entity *selector = video->selector;
+		struct v4l2_input *input = arg;
+		struct uvc_entity *iterm = NULL;
+		u32 index = input->index;
+		int pin = 0;
+
+		if (selector == NULL ||
+		    (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
+			if (index != 0)
+				return -EINVAL;
+			iterm = list_first_entry(&video->iterms,
+					struct uvc_entity, chain);
+			pin = iterm->id;
+		} else if (pin < selector->selector.bNrInPins) {
+			pin = selector->selector.baSourceID[index];
+			list_for_each_entry(iterm, video->iterms.next, chain) {
+				if (iterm->id == pin)
+					break;
+			}
+		}
+
+		if (iterm == NULL || iterm->id != pin)
+			return -EINVAL;
+
+		memset(input, 0, sizeof *input);
+		input->index = index;
+		strncpy(input->name, iterm->name, sizeof input->name);
+		if (UVC_ENTITY_TYPE(iterm) == ITT_CAMERA)
+			input->type = V4L2_INPUT_TYPE_CAMERA;
+		break;
+	}
+
+	case VIDIOC_G_INPUT:
+	{
+		u8 input;
+
+		if (video->selector == NULL ||
+		    (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
+			*(int *)arg = 0;
+			break;
+		}
+
+		ret = uvc_query_ctrl(video->dev, GET_CUR, video->selector->id,
+			video->dev->intfnum, SU_INPUT_SELECT_CONTROL,
+			&input, 1);
+		if (ret < 0)
+			return ret;
+
+		*(int *)arg = input - 1;
+		break;
+	}
+
+	case VIDIOC_S_INPUT:
+	{
+		u8 input = *(u32 *)arg + 1;
+
+		if ((ret = uvc_acquire_privileges(handle)) < 0)
+			return ret;
+
+		if (video->selector == NULL ||
+		    (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
+			if (input != 1)
+				return -EINVAL;
+			break;
+		}
+
+		if (input > video->selector->selector.bNrInPins)
+			return -EINVAL;
+
+		return uvc_query_ctrl(video->dev, SET_CUR, video->selector->id,
+			video->dev->intfnum, SU_INPUT_SELECT_CONTROL,
+			&input, 1);
+	}
+
+	/* Try, Get, Set & Enum format */
+	case VIDIOC_ENUM_FMT:
+	{
+		struct v4l2_fmtdesc *fmt = arg;
+		struct uvc_format *format;
+
+		if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
+		    fmt->index >= video->streaming->nformats)
+			return -EINVAL;
+
+		format = &video->streaming->format[fmt->index];
+		fmt->flags = 0;
+		if (format->flags & UVC_FMT_FLAG_COMPRESSED)
+			fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
+		strncpy(fmt->description, format->name,
+			sizeof fmt->description);
+		fmt->description[sizeof fmt->description - 1] = 0;
+		fmt->pixelformat = format->fcc;
+		break;
+	}
+
+	case VIDIOC_TRY_FMT:
+	{
+		struct uvc_streaming_control probe;
+
+		if ((ret = uvc_acquire_privileges(handle)) < 0)
+			return ret;
+
+		return uvc_v4l2_try_format(video, arg, &probe, NULL, NULL);
+	}
+
+	case VIDIOC_S_FMT:
+		if ((ret = uvc_acquire_privileges(handle)) < 0)
+			return ret;
+
+		return uvc_v4l2_set_format(video, arg);
+
+	case VIDIOC_G_FMT:
+		return uvc_v4l2_get_format(video, arg);
+
+	/* Frame size enumeration */
+	case VIDIOC_ENUM_FRAMESIZES:
+	{
+		struct v4l2_frmsizeenum *fsize = arg;
+		struct uvc_format *format = NULL;
+		struct uvc_frame *frame;
+		int i;
+
+		/* Look for the given pixel format */
+		for (i = 0; i < video->streaming->nformats; i++) {
+			if (video->streaming->format[i].fcc ==
+					fsize->pixel_format) {
+				format = &video->streaming->format[i];
+				break;
+			}
+		}
+		if (format == NULL)
+			return -EINVAL;
+
+		if (fsize->index >= format->nframes)
+			return -EINVAL;
+
+		frame = &format->frame[fsize->index];
+		fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
+		fsize->discrete.width = frame->wWidth;
+		fsize->discrete.height = frame->wHeight;
+		break;
+	}
+
+	/* Frame interval enumeration */
+	case VIDIOC_ENUM_FRAMEINTERVALS:
+	{
+		struct v4l2_frmivalenum *fival = arg;
+		struct uvc_format *format = NULL;
+		struct uvc_frame *frame = NULL;
+		int i;
+
+		/* Look for the given pixel format and frame size */
+		for (i = 0; i < video->streaming->nformats; i++) {
+			if (video->streaming->format[i].fcc ==
+					fival->pixel_format) {
+				format = &video->streaming->format[i];
+				break;
+			}
+		}
+		if (format == NULL)
+			return -EINVAL;
+
+		for (i = 0; i < format->nframes; i++) {
+			if (format->frame[i].wWidth == fival->width &&
+			    format->frame[i].wHeight == fival->height) {
+				frame = &format->frame[i];
+				break;
+			}
+		}
+		if (frame == NULL)
+			return -EINVAL;
+
+		if (frame->bFrameIntervalType) {
+			if (fival->index >= frame->bFrameIntervalType)
+				return -EINVAL;
+
+			fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
+			fival->discrete.numerator =
+				frame->dwFrameInterval[fival->index];
+			fival->discrete.denominator = 10000000;
+			uvc_simplify_fraction(&fival->discrete.numerator,
+				&fival->discrete.denominator, 8, 333);
+		} else {
+			fival->type = V4L2_FRMIVAL_TYPE_STEPWISE;
+			fival->stepwise.min.numerator =
+				frame->dwFrameInterval[0];
+			fival->stepwise.min.denominator = 10000000;
+			fival->stepwise.max.numerator =
+				frame->dwFrameInterval[1];
+			fival->stepwise.max.denominator = 10000000;
+			fival->stepwise.step.numerator =
+				frame->dwFrameInterval[2];
+			fival->stepwise.step.denominator = 10000000;
+			uvc_simplify_fraction(&fival->stepwise.min.numerator,
+				&fival->stepwise.min.denominator, 8, 333);
+			uvc_simplify_fraction(&fival->stepwise.max.numerator,
+				&fival->stepwise.max.denominator, 8, 333);
+			uvc_simplify_fraction(&fival->stepwise.step.numerator,
+				&fival->stepwise.step.denominator, 8, 333);
+		}
+		break;
+	}
+
+	/* Get & Set streaming parameters */
+	case VIDIOC_G_PARM:
+		return uvc_v4l2_get_streamparm(video, arg);
+
+	case VIDIOC_S_PARM:
+		if ((ret = uvc_acquire_privileges(handle)) < 0)
+			return ret;
+
+		return uvc_v4l2_set_streamparm(video, arg);
+
+	/* Cropping and scaling */
+	case VIDIOC_CROPCAP:
+	{
+		struct v4l2_cropcap *ccap = arg;
+		struct uvc_frame *frame = video->streaming->cur_frame;
+
+		if (ccap->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+			return -EINVAL;
+
+		ccap->bounds.left = 0;
+		ccap->bounds.top = 0;
+		ccap->bounds.width = frame->wWidth;
+		ccap->bounds.height = frame->wHeight;
+
+		ccap->defrect = ccap->bounds;
+
+		ccap->pixelaspect.numerator = 1;
+		ccap->pixelaspect.denominator = 1;
+		break;
+	}
+
+	case VIDIOC_G_CROP:
+	case VIDIOC_S_CROP:
+		return -EINVAL;
+
+	/* Buffers & streaming */
+	case VIDIOC_REQBUFS:
+	{
+		struct v4l2_requestbuffers *rb = arg;
+		unsigned int bufsize =
+			video->streaming->ctrl.dwMaxVideoFrameSize;
+
+		if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
+		    rb->memory != V4L2_MEMORY_MMAP)
+			return -EINVAL;
+
+		if ((ret = uvc_acquire_privileges(handle)) < 0)
+			return ret;
+
+		ret = uvc_alloc_buffers(&video->queue, rb->count, bufsize);
+		if (ret < 0)
+			return ret;
+
+		if (!(video->streaming->cur_format->flags &
+		    UVC_FMT_FLAG_COMPRESSED))
+			video->queue.flags |= UVC_QUEUE_DROP_INCOMPLETE;
+
+		rb->count = ret;
+		ret = 0;
+		break;
+	}
+
+	case VIDIOC_QUERYBUF:
+	{
+		struct v4l2_buffer *buf = arg;
+
+		if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+			return -EINVAL;
+
+		if (!uvc_has_privileges(handle))
+			return -EBUSY;
+
+		return uvc_query_buffer(&video->queue, buf);
+	}
+
+	case VIDIOC_QBUF:
+		if (!uvc_has_privileges(handle))
+			return -EBUSY;
+
+		return uvc_queue_buffer(&video->queue, arg);
+
+	case VIDIOC_DQBUF:
+		if (!uvc_has_privileges(handle))
+			return -EBUSY;
+
+		return uvc_dequeue_buffer(&video->queue, arg,
+			file->f_flags & O_NONBLOCK);
+
+	case VIDIOC_STREAMON:
+	{
+		int *type = arg;
+
+		if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+			return -EINVAL;
+
+		if (!uvc_has_privileges(handle))
+			return -EBUSY;
+
+		if ((ret = uvc_video_enable(video, 1)) < 0)
+			return ret;
+		break;
+	}
+
+	case VIDIOC_STREAMOFF:
+	{
+		int *type = arg;
+
+		if (*type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+			return -EINVAL;
+
+		if (!uvc_has_privileges(handle))
+			return -EBUSY;
+
+		return uvc_video_enable(video, 0);
+	}
+
+	/* Analog video standards make no sense for digital cameras. */
+	case VIDIOC_ENUMSTD:
+	case VIDIOC_QUERYSTD:
+	case VIDIOC_G_STD:
+	case VIDIOC_S_STD:
+
+	case VIDIOC_OVERLAY:
+
+	case VIDIOC_ENUMAUDIO:
+	case VIDIOC_ENUMAUDOUT:
+
+	case VIDIOC_ENUMOUTPUT:
+		uvc_trace(UVC_TRACE_IOCTL, "Unsupported ioctl 0x%08x\n", cmd);
+		return -EINVAL;
+
+	/* Dynamic controls. */
+	case UVCIOC_CTRL_ADD:
+	{
+		struct uvc_xu_control_info *xinfo = arg;
+		struct uvc_control_info *info;
+
+		if (!capable(CAP_SYS_ADMIN))
+			return -EPERM;
+
+		info = kmalloc(sizeof *info, GFP_KERNEL);
+		if (info == NULL)
+			return -ENOMEM;
+
+		memcpy(info->entity, xinfo->entity, sizeof info->entity);
+		info->index = xinfo->index;
+		info->selector = xinfo->selector;
+		info->size = xinfo->size;
+		info->flags = xinfo->flags;
+
+		info->flags |= UVC_CONTROL_GET_MIN | UVC_CONTROL_GET_MAX |
+				UVC_CONTROL_GET_RES | UVC_CONTROL_GET_DEF;
+
+		ret = uvc_ctrl_add_info(info);
+		if (ret < 0)
+			kfree(info);
+		break;
+	}
+
+	case UVCIOC_CTRL_MAP:
+	{
+		struct uvc_xu_control_mapping *xmap = arg;
+		struct uvc_control_mapping *map;
+
+		if (!capable(CAP_SYS_ADMIN))
+			return -EPERM;
+
+		map = kmalloc(sizeof *map, GFP_KERNEL);
+		if (map == NULL)
+			return -ENOMEM;
+
+		map->id = xmap->id;
+		memcpy(map->name, xmap->name, sizeof map->name);
+		memcpy(map->entity, xmap->entity, sizeof map->entity);
+		map->selector = xmap->selector;
+		map->size = xmap->size;
+		map->offset = xmap->offset;
+		map->v4l2_type = xmap->v4l2_type;
+		map->data_type = xmap->data_type;
+
+		ret = uvc_ctrl_add_mapping(map);
+		if (ret < 0)
+			kfree(map);
+		break;
+	}
+
+	case UVCIOC_CTRL_GET:
+		return uvc_xu_ctrl_query(video, arg, 0);
+
+	case UVCIOC_CTRL_SET:
+		return uvc_xu_ctrl_query(video, arg, 1);
+
+	default:
+		if ((ret = v4l_compat_translate_ioctl(inode, file, cmd, arg,
+			uvc_v4l2_do_ioctl)) == -ENOIOCTLCMD)
+			uvc_trace(UVC_TRACE_IOCTL, "Unknown ioctl 0x%08x\n",
+				  cmd);
+		return ret;
+	}
+
+	return ret;
+}
+
+static int uvc_v4l2_ioctl(struct inode *inode, struct file *file,
+		     unsigned int cmd, unsigned long arg)
+{
+	uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_ioctl\n");
+	return video_usercopy(inode, file, cmd, arg, uvc_v4l2_do_ioctl);
+}
+
+static ssize_t uvc_v4l2_read(struct file *file, char __user *data,
+		    size_t count, loff_t *ppos)
+{
+	uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_read: not implemented.\n");
+	return -ENODEV;
+}
+
+/*
+ * VMA operations.
+ */
+static void uvc_vm_open(struct vm_area_struct *vma)
+{
+	struct uvc_buffer *buffer = vma->vm_private_data;
+	buffer->vma_use_count++;
+}
+
+static void uvc_vm_close(struct vm_area_struct *vma)
+{
+	struct uvc_buffer *buffer = vma->vm_private_data;
+	buffer->vma_use_count--;
+}
+
+static struct vm_operations_struct uvc_vm_ops = {
+	.open		= uvc_vm_open,
+	.close		= uvc_vm_close,
+};
+
+static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
+{
+	struct video_device *vdev = video_devdata(file);
+	struct uvc_video_device *video = video_get_drvdata(vdev);
+	struct uvc_buffer *buffer;
+	struct page *page;
+	unsigned long addr, start, size;
+	unsigned int i;
+	int ret = 0;
+
+	uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_mmap\n");
+
+	start = vma->vm_start;
+	size = vma->vm_end - vma->vm_start;
+
+	mutex_lock(&video->queue.mutex);
+
+	for (i = 0; i < video->queue.count; ++i) {
+		buffer = &video->queue.buffer[i];
+		if ((buffer->buf.m.offset >> PAGE_SHIFT) == vma->vm_pgoff)
+			break;
+	}
+
+	if (i == video->queue.count || size != video->queue.buf_size) {
+		ret = -EINVAL;
+		goto done;
+	}
+
+	/*
+	 * VM_IO marks the area as being an mmaped region for I/O to a
+	 * device. It also prevents the region from being core dumped.
+	 */
+	vma->vm_flags |= VM_IO;
+
+	addr = (unsigned long)video->queue.mem + buffer->buf.m.offset;
+	while (size > 0) {
+		page = vmalloc_to_page((void *)addr);
+		if ((ret = vm_insert_page(vma, start, page)) < 0)
+			goto done;
+
+		start += PAGE_SIZE;
+		addr += PAGE_SIZE;
+		size -= PAGE_SIZE;
+	}
+
+	vma->vm_ops = &uvc_vm_ops;
+	vma->vm_private_data = buffer;
+	uvc_vm_open(vma);
+
+done:
+	mutex_unlock(&video->queue.mutex);
+	return ret;
+}
+
+static unsigned int uvc_v4l2_poll(struct file *file, poll_table *wait)
+{
+	struct video_device *vdev = video_devdata(file);
+	struct uvc_video_device *video = video_get_drvdata(vdev);
+
+	uvc_trace(UVC_TRACE_CALLS, "uvc_v4l2_poll\n");
+
+	return uvc_queue_poll(&video->queue, file, wait);
+}
+
+struct file_operations uvc_fops = {
+	.owner		= THIS_MODULE,
+	.open		= uvc_v4l2_open,
+	.release	= uvc_v4l2_release,
+	.ioctl		= uvc_v4l2_ioctl,
+	.compat_ioctl	= v4l_compat_ioctl32,
+	.llseek		= no_llseek,
+	.read		= uvc_v4l2_read,
+	.mmap		= uvc_v4l2_mmap,
+	.poll		= uvc_v4l2_poll,
+};
diff --git a/drivers/media/video/uvc/uvc_video.c b/drivers/media/video/uvc/uvc_video.c
new file mode 100644
index 00000000000..6faf1fb2161
--- /dev/null
+++ b/drivers/media/video/uvc/uvc_video.c
@@ -0,0 +1,934 @@
+/*
+ *      uvc_video.c  --  USB Video Class driver - Video handling
+ *
+ *      Copyright (C) 2005-2008
+ *          Laurent Pinchart (laurent.pinchart@skynet.be)
+ *
+ *      This program is free software; you can redistribute it and/or modify
+ *      it under the terms of the GNU General Public License as published by
+ *      the Free Software Foundation; either version 2 of the License, or
+ *      (at your option) any later version.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/version.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/usb.h>
+#include <linux/videodev2.h>
+#include <linux/vmalloc.h>
+#include <linux/wait.h>
+#include <asm/atomic.h>
+#include <asm/unaligned.h>
+
+#include <media/v4l2-common.h>
+
+#include "uvcvideo.h"
+
+/* ------------------------------------------------------------------------
+ * UVC Controls
+ */
+
+static int __uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit,
+			__u8 intfnum, __u8 cs, void *data, __u16 size,
+			int timeout)
+{
+	__u8 type = USB_TYPE_CLASS | USB_RECIP_INTERFACE;
+	unsigned int pipe;
+	int ret;
+
+	pipe = (query & 0x80) ? usb_rcvctrlpipe(dev->udev, 0)
+			      : usb_sndctrlpipe(dev->udev, 0);
+	type |= (query & 0x80) ? USB_DIR_IN : USB_DIR_OUT;
+
+	ret = usb_control_msg(dev->udev, pipe, query, type, cs << 8,
+			unit << 8 | intfnum, data, size, timeout);
+
+	if (ret != size) {
+		uvc_printk(KERN_ERR, "Failed to query (%u) UVC control %u "
+			"(unit %u) : %d (exp. %u).\n", query, cs, unit, ret,
+			size);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+int uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit,
+			__u8 intfnum, __u8 cs, void *data, __u16 size)
+{
+	return __uvc_query_ctrl(dev, query, unit, intfnum, cs, data, size,
+				UVC_CTRL_CONTROL_TIMEOUT);
+}
+
+static void uvc_fixup_buffer_size(struct uvc_video_device *video,
+	struct uvc_streaming_control *ctrl)
+{
+	struct uvc_format *format;
+	struct uvc_frame *frame;
+
+	if (ctrl->bFormatIndex <= 0 ||
+	    ctrl->bFormatIndex > video->streaming->nformats)
+		return;
+
+	format = &video->streaming->format[ctrl->bFormatIndex - 1];
+
+	if (ctrl->bFrameIndex <= 0 ||
+	    ctrl->bFrameIndex > format->nframes)
+		return;
+
+	frame = &format->frame[ctrl->bFrameIndex - 1];
+
+	if (!(format->flags & UVC_FMT_FLAG_COMPRESSED) ||
+	     (ctrl->dwMaxVideoFrameSize == 0 &&
+	      video->dev->uvc_version < 0x0110))
+		ctrl->dwMaxVideoFrameSize =
+			frame->dwMaxVideoFrameBufferSize;
+}
+
+static int uvc_get_video_ctrl(struct uvc_video_device *video,
+	struct uvc_streaming_control *ctrl, int probe, __u8 query)
+{
+	__u8 data[34];
+	__u8 size;
+	int ret;
+
+	size = video->dev->uvc_version >= 0x0110 ? 34 : 26;
+	ret = __uvc_query_ctrl(video->dev, query, 0, video->streaming->intfnum,
+		probe ? VS_PROBE_CONTROL : VS_COMMIT_CONTROL, &data, size,
+		UVC_CTRL_STREAMING_TIMEOUT);
+
+	if (ret < 0)
+		return ret;
+
+	ctrl->bmHint = le16_to_cpup((__le16 *)&data[0]);
+	ctrl->bFormatIndex = data[2];
+	ctrl->bFrameIndex = data[3];
+	ctrl->dwFrameInterval = le32_to_cpup((__le32 *)&data[4]);
+	ctrl->wKeyFrameRate = le16_to_cpup((__le16 *)&data[8]);
+	ctrl->wPFrameRate = le16_to_cpup((__le16 *)&data[10]);
+	ctrl->wCompQuality = le16_to_cpup((__le16 *)&data[12]);
+	ctrl->wCompWindowSize = le16_to_cpup((__le16 *)&data[14]);
+	ctrl->wDelay = le16_to_cpup((__le16 *)&data[16]);
+	ctrl->dwMaxVideoFrameSize =
+		le32_to_cpu(get_unaligned((__le32 *)&data[18]));
+	ctrl->dwMaxPayloadTransferSize =
+		le32_to_cpu(get_unaligned((__le32 *)&data[22]));
+
+	if (size == 34) {
+		ctrl->dwClockFrequency =
+			le32_to_cpu(get_unaligned((__le32 *)&data[26]));
+		ctrl->bmFramingInfo = data[30];
+		ctrl->bPreferedVersion = data[31];
+		ctrl->bMinVersion = data[32];
+		ctrl->bMaxVersion = data[33];
+	} else {
+		ctrl->dwClockFrequency = video->dev->clock_frequency;
+		ctrl->bmFramingInfo = 0;
+		ctrl->bPreferedVersion = 0;
+		ctrl->bMinVersion = 0;
+		ctrl->bMaxVersion = 0;
+	}
+
+	/* Some broken devices return a null or wrong dwMaxVideoFrameSize.
+	 * Try to get the value from the format and frame descriptor.
+	 */
+	uvc_fixup_buffer_size(video, ctrl);
+
+	return 0;
+}
+
+int uvc_set_video_ctrl(struct uvc_video_device *video,
+	struct uvc_streaming_control *ctrl, int probe)
+{
+	__u8 data[34];
+	__u8 size;
+
+	size = video->dev->uvc_version >= 0x0110 ? 34 : 26;
+	memset(data, 0, sizeof data);
+
+	*(__le16 *)&data[0] = cpu_to_le16(ctrl->bmHint);
+	data[2] = ctrl->bFormatIndex;
+	data[3] = ctrl->bFrameIndex;
+	*(__le32 *)&data[4] = cpu_to_le32(ctrl->dwFrameInterval);
+	*(__le16 *)&data[8] = cpu_to_le16(ctrl->wKeyFrameRate);
+	*(__le16 *)&data[10] = cpu_to_le16(ctrl->wPFrameRate);
+	*(__le16 *)&data[12] = cpu_to_le16(ctrl->wCompQuality);
+	*(__le16 *)&data[14] = cpu_to_le16(ctrl->wCompWindowSize);
+	*(__le16 *)&data[16] = cpu_to_le16(ctrl->wDelay);
+	/* Note: Some of the fields below are not required for IN devices (see
+	 * UVC spec, 4.3.1.1), but we still copy them in case support for OUT
+	 * devices is added in the future. */
+	put_unaligned(cpu_to_le32(ctrl->dwMaxVideoFrameSize),
+		(__le32 *)&data[18]);
+	put_unaligned(cpu_to_le32(ctrl->dwMaxPayloadTransferSize),
+		(__le32 *)&data[22]);
+
+	if (size == 34) {
+		put_unaligned(cpu_to_le32(ctrl->dwClockFrequency),
+			(__le32 *)&data[26]);
+		data[30] = ctrl->bmFramingInfo;
+		data[31] = ctrl->bPreferedVersion;
+		data[32] = ctrl->bMinVersion;
+		data[33] = ctrl->bMaxVersion;
+	}
+
+	return __uvc_query_ctrl(video->dev, SET_CUR, 0,
+		video->streaming->intfnum,
+		probe ? VS_PROBE_CONTROL : VS_COMMIT_CONTROL, &data, size,
+		UVC_CTRL_STREAMING_TIMEOUT);
+}
+
+int uvc_probe_video(struct uvc_video_device *video,
+	struct uvc_streaming_control *probe)
+{
+	struct uvc_streaming_control probe_min, probe_max;
+	__u16 bandwidth;
+	unsigned int i;
+	int ret;
+
+	mutex_lock(&video->streaming->mutex);
+
+	/* Perform probing. The device should adjust the requested values
+	 * according to its capabilities. However, some devices, namely the
+	 * first generation UVC Logitech webcams, don't implement the Video
+	 * Probe control properly, and just return the needed bandwidth. For
+	 * that reason, if the needed bandwidth exceeds the maximum available
+	 * bandwidth, try to lower the quality.
+	 */
+	if ((ret = uvc_set_video_ctrl(video, probe, 1)) < 0)
+		goto done;
+
+	/* Get the minimum and maximum values for compression settings. */
+	if (!(video->dev->quirks & UVC_QUIRK_PROBE_MINMAX)) {
+		ret = uvc_get_video_ctrl(video, &probe_min, 1, GET_MIN);
+		if (ret < 0)
+			goto done;
+		ret = uvc_get_video_ctrl(video, &probe_max, 1, GET_MAX);
+		if (ret < 0)
+			goto done;
+
+		probe->wCompQuality = probe_max.wCompQuality;
+	}
+
+	for (i = 0; i < 2; ++i) {
+		if ((ret = uvc_set_video_ctrl(video, probe, 1)) < 0 ||
+		    (ret = uvc_get_video_ctrl(video, probe, 1, GET_CUR)) < 0)
+			goto done;
+
+		if (video->streaming->intf->num_altsetting == 1)
+			break;
+
+		bandwidth = probe->dwMaxPayloadTransferSize;
+		if (bandwidth <= video->streaming->maxpsize)
+			break;
+
+		if (video->dev->quirks & UVC_QUIRK_PROBE_MINMAX) {
+			ret = -ENOSPC;
+			goto done;
+		}
+
+		/* TODO: negotiate compression parameters */
+		probe->wKeyFrameRate = probe_min.wKeyFrameRate;
+		probe->wPFrameRate = probe_min.wPFrameRate;
+		probe->wCompQuality = probe_max.wCompQuality;
+		probe->wCompWindowSize = probe_min.wCompWindowSize;
+	}
+
+done:
+	mutex_unlock(&video->streaming->mutex);
+	return ret;
+}
+
+/* ------------------------------------------------------------------------
+ * Video codecs
+ */
+
+/* Values for bmHeaderInfo (Video and Still Image Payload Headers, 2.4.3.3) */
+#define UVC_STREAM_EOH	(1 << 7)
+#define UVC_STREAM_ERR	(1 << 6)
+#define UVC_STREAM_STI	(1 << 5)
+#define UVC_STREAM_RES	(1 << 4)
+#define UVC_STREAM_SCR	(1 << 3)
+#define UVC_STREAM_PTS	(1 << 2)
+#define UVC_STREAM_EOF	(1 << 1)
+#define UVC_STREAM_FID	(1 << 0)
+
+/* Video payload decoding is handled by uvc_video_decode_start(),
+ * uvc_video_decode_data() and uvc_video_decode_end().
+ *
+ * uvc_video_decode_start is called with URB data at the start of a bulk or
+ * isochronous payload. It processes header data and returns the header size
+ * in bytes if successful. If an error occurs, it returns a negative error
+ * code. The following error codes have special meanings.
+ *
+ * - EAGAIN informs the caller that the current video buffer should be marked
+ *   as done, and that the function should be called again with the same data
+ *   and a new video buffer. This is used when end of frame conditions can be
+ *   reliably detected at the beginning of the next frame only.
+ *
+ * If an error other than -EAGAIN is returned, the caller will drop the current
+ * payload. No call to uvc_video_decode_data and uvc_video_decode_end will be
+ * made until the next payload. -ENODATA can be used to drop the current
+ * payload if no other error code is appropriate.
+ *
+ * uvc_video_decode_data is called for every URB with URB data. It copies the
+ * data to the video buffer.
+ *
+ * uvc_video_decode_end is called with header data at the end of a bulk or
+ * isochronous payload. It performs any additional header data processing and
+ * returns 0 or a negative error code if an error occured. As header data have
+ * already been processed by uvc_video_decode_start, this functions isn't
+ * required to perform sanity checks a second time.
+ *
+ * For isochronous transfers where a payload is always transfered in a single
+ * URB, the three functions will be called in a row.
+ *
+ * To let the decoder process header data and update its internal state even
+ * when no video buffer is available, uvc_video_decode_start must be prepared
+ * to be called with a NULL buf parameter. uvc_video_decode_data and
+ * uvc_video_decode_end will never be called with a NULL buffer.
+ */
+static int uvc_video_decode_start(struct uvc_video_device *video,
+		struct uvc_buffer *buf, const __u8 *data, int len)
+{
+	__u8 fid;
+
+	/* Sanity checks:
+	 * - packet must be at least 2 bytes long
+	 * - bHeaderLength value must be at least 2 bytes (see above)
+	 * - bHeaderLength value can't be larger than the packet size.
+	 */
+	if (len < 2 || data[0] < 2 || data[0] > len)
+		return -EINVAL;
+
+	/* Skip payloads marked with the error bit ("error frames"). */
+	if (data[1] & UVC_STREAM_ERR) {
+		uvc_trace(UVC_TRACE_FRAME, "Dropping payload (error bit "
+			  "set).\n");
+		return -ENODATA;
+	}
+
+	fid = data[1] & UVC_STREAM_FID;
+
+	/* Store the payload FID bit and return immediately when the buffer is
+	 * NULL.
+	 */
+	if (buf == NULL) {
+		video->last_fid = fid;
+		return -ENODATA;
+	}
+
+	/* Synchronize to the input stream by waiting for the FID bit to be
+	 * toggled when the the buffer state is not UVC_BUF_STATE_ACTIVE.
+	 * queue->last_fid is initialized to -1, so the first isochronous
+	 * frame will always be in sync.
+	 *
+	 * If the device doesn't toggle the FID bit, invert video->last_fid
+	 * when the EOF bit is set to force synchronisation on the next packet.
+	 */
+	if (buf->state != UVC_BUF_STATE_ACTIVE) {
+		if (fid == video->last_fid) {
+			uvc_trace(UVC_TRACE_FRAME, "Dropping payload (out of "
+				"sync).\n");
+			if ((video->dev->quirks & UVC_QUIRK_STREAM_NO_FID) &&
+			    (data[1] & UVC_STREAM_EOF))
+				video->last_fid ^= UVC_STREAM_FID;
+			return -ENODATA;
+		}
+
+		/* TODO: Handle PTS and SCR. */
+		buf->state = UVC_BUF_STATE_ACTIVE;
+	}
+
+	/* Mark the buffer as done if we're at the beginning of a new frame.
+	 * End of frame detection is better implemented by checking the EOF
+	 * bit (FID bit toggling is delayed by one frame compared to the EOF
+	 * bit), but some devices don't set the bit at end of frame (and the
+	 * last payload can be lost anyway). We thus must check if the FID has
+	 * been toggled.
+	 *
+	 * queue->last_fid is initialized to -1, so the first isochronous
+	 * frame will never trigger an end of frame detection.
+	 *
+	 * Empty buffers (bytesused == 0) don't trigger end of frame detection
+	 * as it doesn't make sense to return an empty buffer. This also
+	 * avoids detecting and of frame conditions at FID toggling if the
+	 * previous payload had the EOF bit set.
+	 */
+	if (fid != video->last_fid && buf->buf.bytesused != 0) {
+		uvc_trace(UVC_TRACE_FRAME, "Frame complete (FID bit "
+				"toggled).\n");
+		buf->state = UVC_BUF_STATE_DONE;
+		return -EAGAIN;
+	}
+
+	video->last_fid = fid;
+
+	return data[0];
+}
+
+static void uvc_video_decode_data(struct uvc_video_device *video,
+		struct uvc_buffer *buf, const __u8 *data, int len)
+{
+	struct uvc_video_queue *queue = &video->queue;
+	unsigned int maxlen, nbytes;
+	void *mem;
+
+	if (len <= 0)
+		return;
+
+	/* Copy the video data to the buffer. */
+	maxlen = buf->buf.length - buf->buf.bytesused;
+	mem = queue->mem + buf->buf.m.offset + buf->buf.bytesused;
+	nbytes = min((unsigned int)len, maxlen);
+	memcpy(mem, data, nbytes);
+	buf->buf.bytesused += nbytes;
+
+	/* Complete the current frame if the buffer size was exceeded. */
+	if (len > maxlen) {
+		uvc_trace(UVC_TRACE_FRAME, "Frame complete (overflow).\n");
+		buf->state = UVC_BUF_STATE_DONE;
+	}
+}
+
+static void uvc_video_decode_end(struct uvc_video_device *video,
+		struct uvc_buffer *buf, const __u8 *data, int len)
+{
+	/* Mark the buffer as done if the EOF marker is set. */
+	if (data[1] & UVC_STREAM_EOF && buf->buf.bytesused != 0) {
+		uvc_trace(UVC_TRACE_FRAME, "Frame complete (EOF found).\n");
+		if (data[0] == len)
+			uvc_trace(UVC_TRACE_FRAME, "EOF in empty payload.\n");
+		buf->state = UVC_BUF_STATE_DONE;
+		if (video->dev->quirks & UVC_QUIRK_STREAM_NO_FID)
+			video->last_fid ^= UVC_STREAM_FID;
+	}
+}
+
+/* ------------------------------------------------------------------------
+ * URB handling
+ */
+
+/*
+ * Completion handler for video URBs.
+ */
+static void uvc_video_decode_isoc(struct urb *urb,
+	struct uvc_video_device *video, struct uvc_buffer *buf)
+{
+	u8 *mem;
+	int ret, i;
+
+	for (i = 0; i < urb->number_of_packets; ++i) {
+		if (urb->iso_frame_desc[i].status < 0) {
+			uvc_trace(UVC_TRACE_FRAME, "USB isochronous frame "
+				"lost (%d).\n", urb->iso_frame_desc[i].status);
+			continue;
+		}
+
+		/* Decode the payload header. */
+		mem = urb->transfer_buffer + urb->iso_frame_desc[i].offset;
+		do {
+			ret = uvc_video_decode_start(video, buf, mem,
+				urb->iso_frame_desc[i].actual_length);
+			if (ret == -EAGAIN)
+				buf = uvc_queue_next_buffer(&video->queue, buf);
+		} while (ret == -EAGAIN);
+
+		if (ret < 0)
+			continue;
+
+		/* Decode the payload data. */
+		uvc_video_decode_data(video, buf, mem + ret,
+			urb->iso_frame_desc[i].actual_length - ret);
+
+		/* Process the header again. */
+		uvc_video_decode_end(video, buf, mem, ret);
+
+		if (buf->state == UVC_BUF_STATE_DONE ||
+		    buf->state == UVC_BUF_STATE_ERROR)
+			buf = uvc_queue_next_buffer(&video->queue, buf);
+	}
+}
+
+static void uvc_video_decode_bulk(struct urb *urb,
+	struct uvc_video_device *video, struct uvc_buffer *buf)
+{
+	u8 *mem;
+	int len, ret;
+
+	mem = urb->transfer_buffer;
+	len = urb->actual_length;
+	video->bulk.payload_size += len;
+
+	/* If the URB is the first of its payload, decode and save the
+	 * header.
+	 */
+	if (video->bulk.header_size == 0) {
+		do {
+			ret = uvc_video_decode_start(video, buf, mem, len);
+			if (ret == -EAGAIN)
+				buf = uvc_queue_next_buffer(&video->queue, buf);
+		} while (ret == -EAGAIN);
+
+		/* If an error occured skip the rest of the payload. */
+		if (ret < 0 || buf == NULL) {
+			video->bulk.skip_payload = 1;
+			return;
+		}
+
+		video->bulk.header_size = ret;
+		memcpy(video->bulk.header, mem, video->bulk.header_size);
+
+		mem += ret;
+		len -= ret;
+	}
+
+	/* The buffer queue might have been cancelled while a bulk transfer
+	 * was in progress, so we can reach here with buf equal to NULL. Make
+	 * sure buf is never dereferenced if NULL.
+	 */
+
+	/* Process video data. */
+	if (!video->bulk.skip_payload && buf != NULL)
+		uvc_video_decode_data(video, buf, mem, len);
+
+	/* Detect the payload end by a URB smaller than the maximum size (or
+	 * a payload size equal to the maximum) and process the header again.
+	 */
+	if (urb->actual_length < urb->transfer_buffer_length ||
+	    video->bulk.payload_size >= video->bulk.max_payload_size) {
+		if (!video->bulk.skip_payload && buf != NULL) {
+			uvc_video_decode_end(video, buf, video->bulk.header,
+				video->bulk.header_size);
+			if (buf->state == UVC_BUF_STATE_DONE ||
+			    buf->state == UVC_BUF_STATE_ERROR)
+				buf = uvc_queue_next_buffer(&video->queue, buf);
+		}
+
+		video->bulk.header_size = 0;
+		video->bulk.skip_payload = 0;
+		video->bulk.payload_size = 0;
+	}
+}
+
+static void uvc_video_complete(struct urb *urb)
+{
+	struct uvc_video_device *video = urb->context;
+	struct uvc_video_queue *queue = &video->queue;
+	struct uvc_buffer *buf = NULL;
+	unsigned long flags;
+	int ret;
+
+	switch (urb->status) {
+	case 0:
+		break;
+
+	default:
+		uvc_printk(KERN_WARNING, "Non-zero status (%d) in video "
+			"completion handler.\n", urb->status);
+
+	case -ENOENT:		/* usb_kill_urb() called. */
+		if (video->frozen)
+			return;
+
+	case -ECONNRESET:	/* usb_unlink_urb() called. */
+	case -ESHUTDOWN:	/* The endpoint is being disabled. */
+		uvc_queue_cancel(queue, urb->status == -ESHUTDOWN);
+		return;
+	}
+
+	spin_lock_irqsave(&queue->irqlock, flags);
+	if (!list_empty(&queue->irqqueue))
+		buf = list_first_entry(&queue->irqqueue, struct uvc_buffer,
+				       queue);
+	spin_unlock_irqrestore(&queue->irqlock, flags);
+
+	video->decode(urb, video, buf);
+
+	if ((ret = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
+		uvc_printk(KERN_ERR, "Failed to resubmit video URB (%d).\n",
+			ret);
+	}
+}
+
+/*
+ * Uninitialize isochronous/bulk URBs and free transfer buffers.
+ */
+static void uvc_uninit_video(struct uvc_video_device *video)
+{
+	struct urb *urb;
+	unsigned int i;
+
+	for (i = 0; i < UVC_URBS; ++i) {
+		if ((urb = video->urb[i]) == NULL)
+			continue;
+
+		usb_kill_urb(urb);
+		/* urb->transfer_buffer_length is not touched by USB core, so
+		 * we can use it here as the buffer length.
+		 */
+		if (video->urb_buffer[i]) {
+			usb_buffer_free(video->dev->udev,
+				urb->transfer_buffer_length,
+				video->urb_buffer[i], urb->transfer_dma);
+			video->urb_buffer[i] = NULL;
+		}
+
+		usb_free_urb(urb);
+		video->urb[i] = NULL;
+	}
+}
+
+/*
+ * Initialize isochronous URBs and allocate transfer buffers. The packet size
+ * is given by the endpoint.
+ */
+static int uvc_init_video_isoc(struct uvc_video_device *video,
+	struct usb_host_endpoint *ep)
+{
+	struct urb *urb;
+	unsigned int npackets, i, j;
+	__u16 psize;
+	__u32 size;
+
+	/* Compute the number of isochronous packets to allocate by dividing
+	 * the maximum video frame size by the packet size. Limit the result
+	 * to UVC_MAX_ISO_PACKETS.
+	 */
+	psize = le16_to_cpu(ep->desc.wMaxPacketSize);
+	psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
+
+	size = video->streaming->ctrl.dwMaxVideoFrameSize;
+	if (size > UVC_MAX_FRAME_SIZE)
+		return -EINVAL;
+
+	npackets = (size + psize - 1) / psize;
+	if (npackets > UVC_MAX_ISO_PACKETS)
+		npackets = UVC_MAX_ISO_PACKETS;
+
+	size = npackets * psize;
+
+	for (i = 0; i < UVC_URBS; ++i) {
+		urb = usb_alloc_urb(npackets, GFP_KERNEL);
+		if (urb == NULL) {
+			uvc_uninit_video(video);
+			return -ENOMEM;
+		}
+
+		video->urb_buffer[i] = usb_buffer_alloc(video->dev->udev,
+			size, GFP_KERNEL, &urb->transfer_dma);
+		if (video->urb_buffer[i] == NULL) {
+			usb_free_urb(urb);
+			uvc_uninit_video(video);
+			return -ENOMEM;
+		}
+
+		urb->dev = video->dev->udev;
+		urb->context = video;
+		urb->pipe = usb_rcvisocpipe(video->dev->udev,
+				ep->desc.bEndpointAddress);
+		urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
+		urb->interval = ep->desc.bInterval;
+		urb->transfer_buffer = video->urb_buffer[i];
+		urb->complete = uvc_video_complete;
+		urb->number_of_packets = npackets;
+		urb->transfer_buffer_length = size;
+
+		for (j = 0; j < npackets; ++j) {
+			urb->iso_frame_desc[j].offset = j * psize;
+			urb->iso_frame_desc[j].length = psize;
+		}
+
+		video->urb[i] = urb;
+	}
+
+	return 0;
+}
+
+/*
+ * Initialize bulk URBs and allocate transfer buffers. The packet size is
+ * given by the endpoint.
+ */
+static int uvc_init_video_bulk(struct uvc_video_device *video,
+	struct usb_host_endpoint *ep)
+{
+	struct urb *urb;
+	unsigned int pipe, i;
+	__u16 psize;
+	__u32 size;
+
+	/* Compute the bulk URB size. Some devices set the maximum payload
+	 * size to a value too high for memory-constrained devices. We must
+	 * then transfer the payload accross multiple URBs. To be consistant
+	 * with isochronous mode, allocate maximum UVC_MAX_ISO_PACKETS per bulk
+	 * URB.
+	 */
+	psize = le16_to_cpu(ep->desc.wMaxPacketSize) & 0x07ff;
+	size = video->streaming->ctrl.dwMaxPayloadTransferSize;
+	video->bulk.max_payload_size = size;
+	if (size > psize * UVC_MAX_ISO_PACKETS)
+		size = psize * UVC_MAX_ISO_PACKETS;
+
+	pipe = usb_rcvbulkpipe(video->dev->udev, ep->desc.bEndpointAddress);
+
+	for (i = 0; i < UVC_URBS; ++i) {
+		urb = usb_alloc_urb(0, GFP_KERNEL);
+		if (urb == NULL) {
+			uvc_uninit_video(video);
+			return -ENOMEM;
+		}
+
+		video->urb_buffer[i] = usb_buffer_alloc(video->dev->udev,
+			size, GFP_KERNEL, &urb->transfer_dma);
+		if (video->urb_buffer[i] == NULL) {
+			usb_free_urb(urb);
+			uvc_uninit_video(video);
+			return -ENOMEM;
+		}
+
+		usb_fill_bulk_urb(urb, video->dev->udev, pipe,
+			video->urb_buffer[i], size, uvc_video_complete,
+			video);
+		urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
+
+		video->urb[i] = urb;
+	}
+
+	return 0;
+}
+
+/*
+ * Initialize isochronous/bulk URBs and allocate transfer buffers.
+ */
+static int uvc_init_video(struct uvc_video_device *video)
+{
+	struct usb_interface *intf = video->streaming->intf;
+	struct usb_host_interface *alts;
+	struct usb_host_endpoint *ep = NULL;
+	int intfnum = video->streaming->intfnum;
+	unsigned int bandwidth, psize, i;
+	int ret;
+
+	video->last_fid = -1;
+	video->bulk.header_size = 0;
+	video->bulk.skip_payload = 0;
+	video->bulk.payload_size = 0;
+
+	if (intf->num_altsetting > 1) {
+		/* Isochronous endpoint, select the alternate setting. */
+		bandwidth = video->streaming->ctrl.dwMaxPayloadTransferSize;
+
+		if (bandwidth == 0) {
+			uvc_printk(KERN_WARNING, "device %s requested null "
+				"bandwidth, defaulting to lowest.\n",
+				video->vdev->name);
+			bandwidth = 1;
+		}
+
+		for (i = 0; i < intf->num_altsetting; ++i) {
+			alts = &intf->altsetting[i];
+			ep = uvc_find_endpoint(alts,
+				video->streaming->header.bEndpointAddress);
+			if (ep == NULL)
+				continue;
+
+			/* Check if the bandwidth is high enough. */
+			psize = le16_to_cpu(ep->desc.wMaxPacketSize);
+			psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
+			if (psize >= bandwidth)
+				break;
+		}
+
+		if (i >= intf->num_altsetting)
+			return -EIO;
+
+		if ((ret = usb_set_interface(video->dev->udev, intfnum, i)) < 0)
+			return ret;
+
+		ret = uvc_init_video_isoc(video, ep);
+	} else {
+		/* Bulk endpoint, proceed to URB initialization. */
+		ep = uvc_find_endpoint(&intf->altsetting[0],
+				video->streaming->header.bEndpointAddress);
+		if (ep == NULL)
+			return -EIO;
+
+		ret = uvc_init_video_bulk(video, ep);
+	}
+
+	if (ret < 0)
+		return ret;
+
+	/* Submit the URBs. */
+	for (i = 0; i < UVC_URBS; ++i) {
+		if ((ret = usb_submit_urb(video->urb[i], GFP_KERNEL)) < 0) {
+			uvc_printk(KERN_ERR, "Failed to submit URB %u "
+					"(%d).\n", i, ret);
+			uvc_uninit_video(video);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+/* --------------------------------------------------------------------------
+ * Suspend/resume
+ */
+
+/*
+ * Stop streaming without disabling the video queue.
+ *
+ * To let userspace applications resume without trouble, we must not touch the
+ * video buffers in any way. We mark the device as frozen to make sure the URB
+ * completion handler won't try to cancel the queue when we kill the URBs.
+ */
+int uvc_video_suspend(struct uvc_video_device *video)
+{
+	if (!uvc_queue_streaming(&video->queue))
+		return 0;
+
+	video->frozen = 1;
+	uvc_uninit_video(video);
+	usb_set_interface(video->dev->udev, video->streaming->intfnum, 0);
+	return 0;
+}
+
+/*
+ * Reconfigure the video interface and restart streaming if it was enable
+ * before suspend.
+ *
+ * If an error occurs, disable the video queue. This will wake all pending
+ * buffers, making sure userspace applications are notified of the problem
+ * instead of waiting forever.
+ */
+int uvc_video_resume(struct uvc_video_device *video)
+{
+	int ret;
+
+	video->frozen = 0;
+
+	if ((ret = uvc_set_video_ctrl(video, &video->streaming->ctrl, 0)) < 0) {
+		uvc_queue_enable(&video->queue, 0);
+		return ret;
+	}
+
+	if (!uvc_queue_streaming(&video->queue))
+		return 0;
+
+	if ((ret = uvc_init_video(video)) < 0)
+		uvc_queue_enable(&video->queue, 0);
+
+	return ret;
+}
+
+/* ------------------------------------------------------------------------
+ * Video device
+ */
+
+/*
+ * Initialize the UVC video device by retrieving the default format and
+ * committing it.
+ *
+ * Some cameras (namely the Fuji Finepix) set the format and frame
+ * indexes to zero. The UVC standard doesn't clearly make this a spec
+ * violation, so try to silently fix the values if possible.
+ *
+ * This function is called before registering the device with V4L.
+ */
+int uvc_video_init(struct uvc_video_device *video)
+{
+	struct uvc_streaming_control *probe = &video->streaming->ctrl;
+	struct uvc_format *format = NULL;
+	struct uvc_frame *frame = NULL;
+	unsigned int i;
+	int ret;
+
+	if (video->streaming->nformats == 0) {
+		uvc_printk(KERN_INFO, "No supported video formats found.\n");
+		return -EINVAL;
+	}
+
+	/* Alternate setting 0 should be the default, yet the XBox Live Vision
+	 * Cam (and possibly other devices) crash or otherwise misbehave if
+	 * they don't receive a SET_INTERFACE request before any other video
+	 * control request.
+	 */
+	usb_set_interface(video->dev->udev, video->streaming->intfnum, 0);
+
+	/* Some webcams don't suport GET_DEF request on the probe control. We
+	 * fall back to GET_CUR if GET_DEF fails.
+	 */
+	if ((ret = uvc_get_video_ctrl(video, probe, 1, GET_DEF)) < 0 &&
+	    (ret = uvc_get_video_ctrl(video, probe, 1, GET_CUR)) < 0)
+		return ret;
+
+	/* Check if the default format descriptor exists. Use the first
+	 * available format otherwise.
+	 */
+	for (i = video->streaming->nformats; i > 0; --i) {
+		format = &video->streaming->format[i-1];
+		if (format->index == probe->bFormatIndex)
+			break;
+	}
+
+	if (format->nframes == 0) {
+		uvc_printk(KERN_INFO, "No frame descriptor found for the "
+			"default format.\n");
+		return -EINVAL;
+	}
+
+	/* Zero bFrameIndex might be correct. Stream-based formats (including
+	 * MPEG-2 TS and DV) do not support frames but have a dummy frame
+	 * descriptor with bFrameIndex set to zero. If the default frame
+	 * descriptor is not found, use the first avalable frame.
+	 */
+	for (i = format->nframes; i > 0; --i) {
+		frame = &format->frame[i-1];
+		if (frame->bFrameIndex == probe->bFrameIndex)
+			break;
+	}
+
+	/* Commit the default settings. */
+	probe->bFormatIndex = format->index;
+	probe->bFrameIndex = frame->bFrameIndex;
+	if ((ret = uvc_set_video_ctrl(video, probe, 0)) < 0)
+		return ret;
+
+	video->streaming->cur_format = format;
+	video->streaming->cur_frame = frame;
+	atomic_set(&video->active, 0);
+
+	/* Select the video decoding function */
+	if (video->dev->quirks & UVC_QUIRK_BUILTIN_ISIGHT)
+		video->decode = uvc_video_decode_isight;
+	else if (video->streaming->intf->num_altsetting > 1)
+		video->decode = uvc_video_decode_isoc;
+	else
+		video->decode = uvc_video_decode_bulk;
+
+	return 0;
+}
+
+/*
+ * Enable or disable the video stream.
+ */
+int uvc_video_enable(struct uvc_video_device *video, int enable)
+{
+	int ret;
+
+	if (!enable) {
+		uvc_uninit_video(video);
+		usb_set_interface(video->dev->udev,
+			video->streaming->intfnum, 0);
+		uvc_queue_enable(&video->queue, 0);
+		return 0;
+	}
+
+	if ((ret = uvc_queue_enable(&video->queue, 1)) < 0)
+		return ret;
+
+	return uvc_init_video(video);
+}
diff --git a/drivers/media/video/uvc/uvcvideo.h b/drivers/media/video/uvc/uvcvideo.h
new file mode 100644
index 00000000000..a995a780db1
--- /dev/null
+++ b/drivers/media/video/uvc/uvcvideo.h
@@ -0,0 +1,796 @@
+#ifndef _USB_VIDEO_H_
+#define _USB_VIDEO_H_
+
+#include <linux/kernel.h>
+#include <linux/videodev2.h>
+
+
+/*
+ * Dynamic controls
+ */
+
+/* Data types for UVC control data */
+#define UVC_CTRL_DATA_TYPE_RAW		0
+#define UVC_CTRL_DATA_TYPE_SIGNED	1
+#define UVC_CTRL_DATA_TYPE_UNSIGNED	2
+#define UVC_CTRL_DATA_TYPE_BOOLEAN	3
+#define UVC_CTRL_DATA_TYPE_ENUM		4
+#define UVC_CTRL_DATA_TYPE_BITMASK	5
+
+/* Control flags */
+#define UVC_CONTROL_SET_CUR	(1 << 0)
+#define UVC_CONTROL_GET_CUR	(1 << 1)
+#define UVC_CONTROL_GET_MIN	(1 << 2)
+#define UVC_CONTROL_GET_MAX	(1 << 3)
+#define UVC_CONTROL_GET_RES	(1 << 4)
+#define UVC_CONTROL_GET_DEF	(1 << 5)
+/* Control should be saved at suspend and restored at resume. */
+#define UVC_CONTROL_RESTORE	(1 << 6)
+/* Control can be updated by the camera. */
+#define UVC_CONTROL_AUTO_UPDATE	(1 << 7)
+
+#define UVC_CONTROL_GET_RANGE	(UVC_CONTROL_GET_CUR | UVC_CONTROL_GET_MIN | \
+				 UVC_CONTROL_GET_MAX | UVC_CONTROL_GET_RES | \
+				 UVC_CONTROL_GET_DEF)
+
+struct uvc_xu_control_info {
+	__u8 entity[16];
+	__u8 index;
+	__u8 selector;
+	__u16 size;
+	__u32 flags;
+};
+
+struct uvc_xu_control_mapping {
+	__u32 id;
+	__u8 name[32];
+	__u8 entity[16];
+	__u8 selector;
+
+	__u8 size;
+	__u8 offset;
+	enum v4l2_ctrl_type v4l2_type;
+	__u32 data_type;
+};
+
+struct uvc_xu_control {
+	__u8 unit;
+	__u8 selector;
+	__u16 size;
+	__u8 __user *data;
+};
+
+#define UVCIOC_CTRL_ADD		_IOW('U', 1, struct uvc_xu_control_info)
+#define UVCIOC_CTRL_MAP		_IOWR('U', 2, struct uvc_xu_control_mapping)
+#define UVCIOC_CTRL_GET		_IOWR('U', 3, struct uvc_xu_control)
+#define UVCIOC_CTRL_SET		_IOW('U', 4, struct uvc_xu_control)
+
+#ifdef __KERNEL__
+
+#include <linux/poll.h>
+
+/* --------------------------------------------------------------------------
+ * UVC constants
+ */
+
+#define SC_UNDEFINED                    0x00
+#define SC_VIDEOCONTROL                 0x01
+#define SC_VIDEOSTREAMING               0x02
+#define SC_VIDEO_INTERFACE_COLLECTION   0x03
+
+#define PC_PROTOCOL_UNDEFINED           0x00
+
+#define CS_UNDEFINED                    0x20
+#define CS_DEVICE                       0x21
+#define CS_CONFIGURATION                0x22
+#define CS_STRING                       0x23
+#define CS_INTERFACE                    0x24
+#define CS_ENDPOINT                     0x25
+
+/* VideoControl class specific interface descriptor */
+#define VC_DESCRIPTOR_UNDEFINED         0x00
+#define VC_HEADER                       0x01
+#define VC_INPUT_TERMINAL               0x02
+#define VC_OUTPUT_TERMINAL              0x03
+#define VC_SELECTOR_UNIT                0x04
+#define VC_PROCESSING_UNIT              0x05
+#define VC_EXTENSION_UNIT               0x06
+
+/* VideoStreaming class specific interface descriptor */
+#define VS_UNDEFINED                    0x00
+#define VS_INPUT_HEADER                 0x01
+#define VS_OUTPUT_HEADER                0x02
+#define VS_STILL_IMAGE_FRAME            0x03
+#define VS_FORMAT_UNCOMPRESSED          0x04
+#define VS_FRAME_UNCOMPRESSED           0x05
+#define VS_FORMAT_MJPEG                 0x06
+#define VS_FRAME_MJPEG                  0x07
+#define VS_FORMAT_MPEG2TS               0x0a
+#define VS_FORMAT_DV                    0x0c
+#define VS_COLORFORMAT                  0x0d
+#define VS_FORMAT_FRAME_BASED           0x10
+#define VS_FRAME_FRAME_BASED            0x11
+#define VS_FORMAT_STREAM_BASED          0x12
+
+/* Endpoint type */
+#define EP_UNDEFINED                    0x00
+#define EP_GENERAL                      0x01
+#define EP_ENDPOINT                     0x02
+#define EP_INTERRUPT                    0x03
+
+/* Request codes */
+#define RC_UNDEFINED                    0x00
+#define SET_CUR                         0x01
+#define GET_CUR                         0x81
+#define GET_MIN                         0x82
+#define GET_MAX                         0x83
+#define GET_RES                         0x84
+#define GET_LEN                         0x85
+#define GET_INFO                        0x86
+#define GET_DEF                         0x87
+
+/* VideoControl interface controls */
+#define VC_CONTROL_UNDEFINED            0x00
+#define VC_VIDEO_POWER_MODE_CONTROL     0x01
+#define VC_REQUEST_ERROR_CODE_CONTROL   0x02
+
+/* Terminal controls */
+#define TE_CONTROL_UNDEFINED            0x00
+
+/* Selector Unit controls */
+#define SU_CONTROL_UNDEFINED            0x00
+#define SU_INPUT_SELECT_CONTROL         0x01
+
+/* Camera Terminal controls */
+#define CT_CONTROL_UNDEFINED            		0x00
+#define CT_SCANNING_MODE_CONTROL        		0x01
+#define CT_AE_MODE_CONTROL              		0x02
+#define CT_AE_PRIORITY_CONTROL          		0x03
+#define CT_EXPOSURE_TIME_ABSOLUTE_CONTROL               0x04
+#define CT_EXPOSURE_TIME_RELATIVE_CONTROL               0x05
+#define CT_FOCUS_ABSOLUTE_CONTROL       		0x06
+#define CT_FOCUS_RELATIVE_CONTROL       		0x07
+#define CT_FOCUS_AUTO_CONTROL           		0x08
+#define CT_IRIS_ABSOLUTE_CONTROL        		0x09
+#define CT_IRIS_RELATIVE_CONTROL        		0x0a
+#define CT_ZOOM_ABSOLUTE_CONTROL        		0x0b
+#define CT_ZOOM_RELATIVE_CONTROL        		0x0c
+#define CT_PANTILT_ABSOLUTE_CONTROL     		0x0d
+#define CT_PANTILT_RELATIVE_CONTROL     		0x0e
+#define CT_ROLL_ABSOLUTE_CONTROL        		0x0f
+#define CT_ROLL_RELATIVE_CONTROL        		0x10
+#define CT_PRIVACY_CONTROL              		0x11
+
+/* Processing Unit controls */
+#define PU_CONTROL_UNDEFINED            		0x00
+#define PU_BACKLIGHT_COMPENSATION_CONTROL               0x01
+#define PU_BRIGHTNESS_CONTROL           		0x02
+#define PU_CONTRAST_CONTROL             		0x03
+#define PU_GAIN_CONTROL                 		0x04
+#define PU_POWER_LINE_FREQUENCY_CONTROL 		0x05
+#define PU_HUE_CONTROL                  		0x06
+#define PU_SATURATION_CONTROL           		0x07
+#define PU_SHARPNESS_CONTROL            		0x08
+#define PU_GAMMA_CONTROL                		0x09
+#define PU_WHITE_BALANCE_TEMPERATURE_CONTROL            0x0a
+#define PU_WHITE_BALANCE_TEMPERATURE_AUTO_CONTROL       0x0b
+#define PU_WHITE_BALANCE_COMPONENT_CONTROL              0x0c
+#define PU_WHITE_BALANCE_COMPONENT_AUTO_CONTROL         0x0d
+#define PU_DIGITAL_MULTIPLIER_CONTROL   		0x0e
+#define PU_DIGITAL_MULTIPLIER_LIMIT_CONTROL             0x0f
+#define PU_HUE_AUTO_CONTROL             		0x10
+#define PU_ANALOG_VIDEO_STANDARD_CONTROL                0x11
+#define PU_ANALOG_LOCK_STATUS_CONTROL   		0x12
+
+#define LXU_MOTOR_PANTILT_RELATIVE_CONTROL		0x01
+#define LXU_MOTOR_PANTILT_RESET_CONTROL			0x02
+#define LXU_MOTOR_FOCUS_MOTOR_CONTROL			0x03
+
+/* VideoStreaming interface controls */
+#define VS_CONTROL_UNDEFINED            0x00
+#define VS_PROBE_CONTROL                0x01
+#define VS_COMMIT_CONTROL               0x02
+#define VS_STILL_PROBE_CONTROL          0x03
+#define VS_STILL_COMMIT_CONTROL         0x04
+#define VS_STILL_IMAGE_TRIGGER_CONTROL  0x05
+#define VS_STREAM_ERROR_CODE_CONTROL    0x06
+#define VS_GENERATE_KEY_FRAME_CONTROL   0x07
+#define VS_UPDATE_FRAME_SEGMENT_CONTROL 0x08
+#define VS_SYNC_DELAY_CONTROL           0x09
+
+#define TT_VENDOR_SPECIFIC              0x0100
+#define TT_STREAMING                    0x0101
+
+/* Input Terminal types */
+#define ITT_VENDOR_SPECIFIC             0x0200
+#define ITT_CAMERA                      0x0201
+#define ITT_MEDIA_TRANSPORT_INPUT       0x0202
+
+/* Output Terminal types */
+#define OTT_VENDOR_SPECIFIC             0x0300
+#define OTT_DISPLAY                     0x0301
+#define OTT_MEDIA_TRANSPORT_OUTPUT      0x0302
+
+/* External Terminal types */
+#define EXTERNAL_VENDOR_SPECIFIC        0x0400
+#define COMPOSITE_CONNECTOR             0x0401
+#define SVIDEO_CONNECTOR                0x0402
+#define COMPONENT_CONNECTOR             0x0403
+
+#define UVC_TERM_INPUT			0x0000
+#define UVC_TERM_OUTPUT			0x8000
+
+#define UVC_ENTITY_TYPE(entity)		((entity)->type & 0x7fff)
+#define UVC_ENTITY_IS_UNIT(entity)	(((entity)->type & 0xff00) == 0)
+#define UVC_ENTITY_IS_TERM(entity)	(((entity)->type & 0xff00) != 0)
+#define UVC_ENTITY_IS_ITERM(entity) \
+	(((entity)->type & 0x8000) == UVC_TERM_INPUT)
+#define UVC_ENTITY_IS_OTERM(entity) \
+	(((entity)->type & 0x8000) == UVC_TERM_OUTPUT)
+
+#define UVC_STATUS_TYPE_CONTROL		1
+#define UVC_STATUS_TYPE_STREAMING	2
+
+/* ------------------------------------------------------------------------
+ * GUIDs
+ */
+#define UVC_GUID_UVC_CAMERA \
+	{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
+	 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}
+#define UVC_GUID_UVC_OUTPUT \
+	{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
+	 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02}
+#define UVC_GUID_UVC_MEDIA_TRANSPORT_INPUT \
+	{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
+	 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03}
+#define UVC_GUID_UVC_PROCESSING \
+	{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
+	 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01}
+#define UVC_GUID_UVC_SELECTOR \
+	{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
+	 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02}
+
+#define UVC_GUID_LOGITECH_DEV_INFO \
+	{0x82, 0x06, 0x61, 0x63, 0x70, 0x50, 0xab, 0x49, \
+	 0xb8, 0xcc, 0xb3, 0x85, 0x5e, 0x8d, 0x22, 0x1e}
+#define UVC_GUID_LOGITECH_USER_HW \
+	{0x82, 0x06, 0x61, 0x63, 0x70, 0x50, 0xab, 0x49, \
+	 0xb8, 0xcc, 0xb3, 0x85, 0x5e, 0x8d, 0x22, 0x1f}
+#define UVC_GUID_LOGITECH_VIDEO \
+	{0x82, 0x06, 0x61, 0x63, 0x70, 0x50, 0xab, 0x49, \
+	 0xb8, 0xcc, 0xb3, 0x85, 0x5e, 0x8d, 0x22, 0x50}
+#define UVC_GUID_LOGITECH_MOTOR \
+	{0x82, 0x06, 0x61, 0x63, 0x70, 0x50, 0xab, 0x49, \
+	 0xb8, 0xcc, 0xb3, 0x85, 0x5e, 0x8d, 0x22, 0x56}
+
+#define UVC_GUID_FORMAT_MJPEG \
+	{ 'M',  'J',  'P',  'G', 0x00, 0x00, 0x10, 0x00, \
+	 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
+#define UVC_GUID_FORMAT_YUY2 \
+	{ 'Y',  'U',  'Y',  '2', 0x00, 0x00, 0x10, 0x00, \
+	 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
+#define UVC_GUID_FORMAT_NV12 \
+	{ 'N',  'V',  '1',  '2', 0x00, 0x00, 0x10, 0x00, \
+	 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
+#define UVC_GUID_FORMAT_YV12 \
+	{ 'Y',  'V',  '1',  '2', 0x00, 0x00, 0x10, 0x00, \
+	 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
+#define UVC_GUID_FORMAT_I420 \
+	{ 'I',  '4',  '2',  '0', 0x00, 0x00, 0x10, 0x00, \
+	 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
+#define UVC_GUID_FORMAT_UYVY \
+	{ 'U',  'Y',  'V',  'Y', 0x00, 0x00, 0x10, 0x00, \
+	 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
+#define UVC_GUID_FORMAT_Y800 \
+	{ 'Y',  '8',  '0',  '0', 0x00, 0x00, 0x10, 0x00, \
+	 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
+#define UVC_GUID_FORMAT_BY8 \
+	{ 'B',  'Y',  '8',  ' ', 0x00, 0x00, 0x10, 0x00, \
+	 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71}
+
+
+/* ------------------------------------------------------------------------
+ * Driver specific constants.
+ */
+
+#define DRIVER_VERSION_NUMBER	KERNEL_VERSION(0, 1, 0)
+
+/* Number of isochronous URBs. */
+#define UVC_URBS		5
+/* Maximum number of packets per isochronous URB. */
+#define UVC_MAX_ISO_PACKETS	40
+/* Maximum frame size in bytes, for sanity checking. */
+#define UVC_MAX_FRAME_SIZE	(16*1024*1024)
+/* Maximum number of video buffers. */
+#define UVC_MAX_VIDEO_BUFFERS	32
+
+#define UVC_CTRL_CONTROL_TIMEOUT	300
+#define UVC_CTRL_STREAMING_TIMEOUT	1000
+
+/* Devices quirks */
+#define UVC_QUIRK_STATUS_INTERVAL	0x00000001
+#define UVC_QUIRK_PROBE_MINMAX		0x00000002
+#define UVC_QUIRK_PROBE_EXTRAFIELDS	0x00000004
+#define UVC_QUIRK_BUILTIN_ISIGHT	0x00000008
+#define UVC_QUIRK_STREAM_NO_FID		0x00000010
+#define UVC_QUIRK_IGNORE_SELECTOR_UNIT	0x00000020
+
+/* Format flags */
+#define UVC_FMT_FLAG_COMPRESSED		0x00000001
+#define UVC_FMT_FLAG_STREAM		0x00000002
+
+/* ------------------------------------------------------------------------
+ * Structures.
+ */
+
+struct uvc_device;
+
+/* TODO: Put the most frequently accessed fields at the beginning of
+ * structures to maximize cache efficiency.
+ */
+struct uvc_streaming_control {
+	__u16 bmHint;
+	__u8  bFormatIndex;
+	__u8  bFrameIndex;
+	__u32 dwFrameInterval;
+	__u16 wKeyFrameRate;
+	__u16 wPFrameRate;
+	__u16 wCompQuality;
+	__u16 wCompWindowSize;
+	__u16 wDelay;
+	__u32 dwMaxVideoFrameSize;
+	__u32 dwMaxPayloadTransferSize;
+	__u32 dwClockFrequency;
+	__u8  bmFramingInfo;
+	__u8  bPreferedVersion;
+	__u8  bMinVersion;
+	__u8  bMaxVersion;
+};
+
+struct uvc_menu_info {
+	__u32 value;
+	__u8 name[32];
+};
+
+struct uvc_control_info {
+	struct list_head list;
+	struct list_head mappings;
+
+	__u8 entity[16];
+	__u8 index;
+	__u8 selector;
+
+	__u16 size;
+	__u32 flags;
+};
+
+struct uvc_control_mapping {
+	struct list_head list;
+
+	struct uvc_control_info *ctrl;
+
+	__u32 id;
+	__u8 name[32];
+	__u8 entity[16];
+	__u8 selector;
+
+	__u8 size;
+	__u8 offset;
+	enum v4l2_ctrl_type v4l2_type;
+	__u32 data_type;
+
+	struct uvc_menu_info *menu_info;
+	__u32 menu_count;
+};
+
+struct uvc_control {
+	struct uvc_entity *entity;
+	struct uvc_control_info *info;
+
+	__u8 index;	/* Used to match the uvc_control entry with a
+			   uvc_control_info. */
+	__u8 dirty : 1,
+	     loaded : 1,
+	     modified : 1;
+
+	__u8 *data;
+};
+
+struct uvc_format_desc {
+	char *name;
+	__u8 guid[16];
+	__u32 fcc;
+};
+
+/* The term 'entity' refers to both UVC units and UVC terminals.
+ *
+ * The type field is either the terminal type (wTerminalType in the terminal
+ * descriptor), or the unit type (bDescriptorSubtype in the unit descriptor).
+ * As the bDescriptorSubtype field is one byte long, the type value will
+ * always have a null MSB for units. All terminal types defined by the UVC
+ * specification have a non-null MSB, so it is safe to use the MSB to
+ * differentiate between units and terminals as long as the descriptor parsing
+ * code makes sure terminal types have a non-null MSB.
+ *
+ * For terminals, the type's most significant bit stores the terminal
+ * direction (either UVC_TERM_INPUT or UVC_TERM_OUTPUT). The type field should
+ * always be accessed with the UVC_ENTITY_* macros and never directly.
+ */
+
+struct uvc_entity {
+	struct list_head list;		/* Entity as part of a UVC device. */
+	struct list_head chain;		/* Entity as part of a video device
+					 * chain. */
+	__u8 id;
+	__u16 type;
+	char name[64];
+
+	union {
+		struct {
+			__u16 wObjectiveFocalLengthMin;
+			__u16 wObjectiveFocalLengthMax;
+			__u16 wOcularFocalLength;
+			__u8  bControlSize;
+			__u8  *bmControls;
+		} camera;
+
+		struct {
+			__u8  bControlSize;
+			__u8  *bmControls;
+			__u8  bTransportModeSize;
+			__u8  *bmTransportModes;
+		} media;
+
+		struct {
+			__u8  bSourceID;
+		} output;
+
+		struct {
+			__u8  bSourceID;
+			__u16 wMaxMultiplier;
+			__u8  bControlSize;
+			__u8  *bmControls;
+			__u8  bmVideoStandards;
+		} processing;
+
+		struct {
+			__u8  bNrInPins;
+			__u8  *baSourceID;
+		} selector;
+
+		struct {
+			__u8  guidExtensionCode[16];
+			__u8  bNumControls;
+			__u8  bNrInPins;
+			__u8  *baSourceID;
+			__u8  bControlSize;
+			__u8  *bmControls;
+			__u8  *bmControlsType;
+		} extension;
+	};
+
+	unsigned int ncontrols;
+	struct uvc_control *controls;
+};
+
+struct uvc_frame {
+	__u8  bFrameIndex;
+	__u8  bmCapabilities;
+	__u16 wWidth;
+	__u16 wHeight;
+	__u32 dwMinBitRate;
+	__u32 dwMaxBitRate;
+	__u32 dwMaxVideoFrameBufferSize;
+	__u8  bFrameIntervalType;
+	__u32 dwDefaultFrameInterval;
+	__u32 *dwFrameInterval;
+};
+
+struct uvc_format {
+	__u8 type;
+	__u8 index;
+	__u8 bpp;
+	__u8 colorspace;
+	__u32 fcc;
+	__u32 flags;
+
+	char name[32];
+
+	unsigned int nframes;
+	struct uvc_frame *frame;
+};
+
+struct uvc_streaming_header {
+	__u8 bNumFormats;
+	__u8 bEndpointAddress;
+	__u8 bTerminalLink;
+	__u8 bControlSize;
+	__u8 *bmaControls;
+	/* The following fields are used by input headers only. */
+	__u8 bmInfo;
+	__u8 bStillCaptureMethod;
+	__u8 bTriggerSupport;
+	__u8 bTriggerUsage;
+};
+
+struct uvc_streaming {
+	struct list_head list;
+
+	struct usb_interface *intf;
+	int intfnum;
+	__u16 maxpsize;
+
+	struct uvc_streaming_header header;
+
+	unsigned int nformats;
+	struct uvc_format *format;
+
+	struct uvc_streaming_control ctrl;
+	struct uvc_format *cur_format;
+	struct uvc_frame *cur_frame;
+
+	struct mutex mutex;
+};
+
+enum uvc_buffer_state {
+	UVC_BUF_STATE_IDLE       = 0,
+	UVC_BUF_STATE_QUEUED     = 1,
+	UVC_BUF_STATE_ACTIVE     = 2,
+	UVC_BUF_STATE_DONE       = 3,
+	UVC_BUF_STATE_ERROR      = 4,
+};
+
+struct uvc_buffer {
+	unsigned long vma_use_count;
+	struct list_head stream;
+
+	/* Touched by interrupt handler. */
+	struct v4l2_buffer buf;
+	struct list_head queue;
+	wait_queue_head_t wait;
+	enum uvc_buffer_state state;
+};
+
+#define UVC_QUEUE_STREAMING		(1 << 0)
+#define UVC_QUEUE_DISCONNECTED		(1 << 1)
+#define UVC_QUEUE_DROP_INCOMPLETE	(1 << 2)
+
+struct uvc_video_queue {
+	void *mem;
+	unsigned int flags;
+	__u32 sequence;
+
+	unsigned int count;
+	unsigned int buf_size;
+	struct uvc_buffer buffer[UVC_MAX_VIDEO_BUFFERS];
+	struct mutex mutex;	/* protects buffers and mainqueue */
+	spinlock_t irqlock;	/* protects irqqueue */
+
+	struct list_head mainqueue;
+	struct list_head irqqueue;
+};
+
+struct uvc_video_device {
+	struct uvc_device *dev;
+	struct video_device *vdev;
+	atomic_t active;
+	unsigned int frozen : 1;
+
+	struct list_head iterms;
+	struct uvc_entity *oterm;
+	struct uvc_entity *processing;
+	struct uvc_entity *selector;
+	struct list_head extensions;
+	struct mutex ctrl_mutex;
+
+	struct uvc_video_queue queue;
+
+	/* Video streaming object, must always be non-NULL. */
+	struct uvc_streaming *streaming;
+
+	void (*decode) (struct urb *urb, struct uvc_video_device *video,
+			struct uvc_buffer *buf);
+
+	/* Context data used by the bulk completion handler. */
+	struct {
+		__u8 header[256];
+		unsigned int header_size;
+		int skip_payload;
+		__u32 payload_size;
+		__u32 max_payload_size;
+	} bulk;
+
+	struct urb *urb[UVC_URBS];
+	char *urb_buffer[UVC_URBS];
+
+	__u8 last_fid;
+};
+
+enum uvc_device_state {
+	UVC_DEV_DISCONNECTED = 1,
+};
+
+struct uvc_device {
+	struct usb_device *udev;
+	struct usb_interface *intf;
+	__u32 quirks;
+	int intfnum;
+	char name[32];
+
+	enum uvc_device_state state;
+	struct kref kref;
+	struct list_head list;
+
+	/* Video control interface */
+	__u16 uvc_version;
+	__u32 clock_frequency;
+
+	struct list_head entities;
+
+	struct uvc_video_device video;
+
+	/* Status Interrupt Endpoint */
+	struct usb_host_endpoint *int_ep;
+	struct urb *int_urb;
+	__u8 status[16];
+	struct input_dev *input;
+
+	/* Video Streaming interfaces */
+	struct list_head streaming;
+};
+
+enum uvc_handle_state {
+	UVC_HANDLE_PASSIVE	= 0,
+	UVC_HANDLE_ACTIVE	= 1,
+};
+
+struct uvc_fh {
+	struct uvc_video_device *device;
+	enum uvc_handle_state state;
+};
+
+struct uvc_driver {
+	struct usb_driver driver;
+
+	struct mutex open_mutex;	/* protects from open/disconnect race */
+
+	struct list_head devices;	/* struct uvc_device list */
+	struct list_head controls;	/* struct uvc_control_info list */
+	struct mutex ctrl_mutex;	/* protects controls and devices
+					   lists */
+};
+
+/* ------------------------------------------------------------------------
+ * Debugging, printing and logging
+ */
+
+#define UVC_TRACE_PROBE		(1 << 0)
+#define UVC_TRACE_DESCR		(1 << 1)
+#define UVC_TRACE_CONTROL	(1 << 2)
+#define UVC_TRACE_FORMAT	(1 << 3)
+#define UVC_TRACE_CAPTURE	(1 << 4)
+#define UVC_TRACE_CALLS		(1 << 5)
+#define UVC_TRACE_IOCTL		(1 << 6)
+#define UVC_TRACE_FRAME		(1 << 7)
+#define UVC_TRACE_SUSPEND	(1 << 8)
+#define UVC_TRACE_STATUS	(1 << 9)
+
+extern unsigned int uvc_trace_param;
+
+#define uvc_trace(flag, msg...) \
+	do { \
+		if (uvc_trace_param & flag) \
+			printk(KERN_DEBUG "uvcvideo: " msg); \
+	} while (0)
+
+#define uvc_printk(level, msg...) \
+	printk(level "uvcvideo: " msg)
+
+#define UVC_GUID_FORMAT "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-" \
+			"%02x%02x%02x%02x%02x%02x"
+#define UVC_GUID_ARGS(guid) \
+	(guid)[3],  (guid)[2],  (guid)[1],  (guid)[0], \
+	(guid)[5],  (guid)[4], \
+	(guid)[7],  (guid)[6], \
+	(guid)[8],  (guid)[9], \
+	(guid)[10], (guid)[11], (guid)[12], \
+	(guid)[13], (guid)[14], (guid)[15]
+
+/* --------------------------------------------------------------------------
+ * Internal functions.
+ */
+
+/* Core driver */
+extern struct uvc_driver uvc_driver;
+extern void uvc_delete(struct kref *kref);
+
+/* Video buffers queue management. */
+extern void uvc_queue_init(struct uvc_video_queue *queue);
+extern int uvc_alloc_buffers(struct uvc_video_queue *queue,
+		unsigned int nbuffers, unsigned int buflength);
+extern int uvc_free_buffers(struct uvc_video_queue *queue);
+extern int uvc_query_buffer(struct uvc_video_queue *queue,
+		struct v4l2_buffer *v4l2_buf);
+extern int uvc_queue_buffer(struct uvc_video_queue *queue,
+		struct v4l2_buffer *v4l2_buf);
+extern int uvc_dequeue_buffer(struct uvc_video_queue *queue,
+		struct v4l2_buffer *v4l2_buf, int nonblocking);
+extern int uvc_queue_enable(struct uvc_video_queue *queue, int enable);
+extern void uvc_queue_cancel(struct uvc_video_queue *queue, int disconnect);
+extern struct uvc_buffer *uvc_queue_next_buffer(struct uvc_video_queue *queue,
+		struct uvc_buffer *buf);
+extern unsigned int uvc_queue_poll(struct uvc_video_queue *queue,
+		struct file *file, poll_table *wait);
+static inline int uvc_queue_streaming(struct uvc_video_queue *queue)
+{
+	return queue->flags & UVC_QUEUE_STREAMING;
+}
+
+/* V4L2 interface */
+extern struct file_operations uvc_fops;
+
+/* Video */
+extern int uvc_video_init(struct uvc_video_device *video);
+extern int uvc_video_suspend(struct uvc_video_device *video);
+extern int uvc_video_resume(struct uvc_video_device *video);
+extern int uvc_video_enable(struct uvc_video_device *video, int enable);
+extern int uvc_probe_video(struct uvc_video_device *video,
+		struct uvc_streaming_control *probe);
+extern int uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit,
+		__u8 intfnum, __u8 cs, void *data, __u16 size);
+extern int uvc_set_video_ctrl(struct uvc_video_device *video,
+		struct uvc_streaming_control *ctrl, int probe);
+
+/* Status */
+extern int uvc_status_init(struct uvc_device *dev);
+extern void uvc_status_cleanup(struct uvc_device *dev);
+extern int uvc_status_suspend(struct uvc_device *dev);
+extern int uvc_status_resume(struct uvc_device *dev);
+
+/* Controls */
+extern struct uvc_control *uvc_find_control(struct uvc_video_device *video,
+		__u32 v4l2_id, struct uvc_control_mapping **mapping);
+extern int uvc_query_v4l2_ctrl(struct uvc_video_device *video,
+		struct v4l2_queryctrl *v4l2_ctrl);
+
+extern int uvc_ctrl_add_info(struct uvc_control_info *info);
+extern int uvc_ctrl_add_mapping(struct uvc_control_mapping *mapping);
+extern int uvc_ctrl_init_device(struct uvc_device *dev);
+extern void uvc_ctrl_cleanup_device(struct uvc_device *dev);
+extern int uvc_ctrl_resume_device(struct uvc_device *dev);
+extern void uvc_ctrl_init(void);
+
+extern int uvc_ctrl_begin(struct uvc_video_device *video);
+extern int __uvc_ctrl_commit(struct uvc_video_device *video, int rollback);
+static inline int uvc_ctrl_commit(struct uvc_video_device *video)
+{
+	return __uvc_ctrl_commit(video, 0);
+}
+static inline int uvc_ctrl_rollback(struct uvc_video_device *video)
+{
+	return __uvc_ctrl_commit(video, 1);
+}
+
+extern int uvc_ctrl_get(struct uvc_video_device *video,
+		struct v4l2_ext_control *xctrl);
+extern int uvc_ctrl_set(struct uvc_video_device *video,
+		struct v4l2_ext_control *xctrl);
+
+extern int uvc_xu_ctrl_query(struct uvc_video_device *video,
+		struct uvc_xu_control *ctrl, int set);
+
+/* Utility functions */
+extern void uvc_simplify_fraction(uint32_t *numerator, uint32_t *denominator,
+		unsigned int n_terms, unsigned int threshold);
+extern uint32_t uvc_fraction_to_interval(uint32_t numerator,
+		uint32_t denominator);
+extern struct usb_host_endpoint *uvc_find_endpoint(
+		struct usb_host_interface *alts, __u8 epaddr);
+
+/* Quirks support */
+void uvc_video_decode_isight(struct urb *urb, struct uvc_video_device *video,
+		struct uvc_buffer *buf);
+
+#endif /* __KERNEL__ */
+
+#endif
diff --git a/drivers/media/video/videodev.c b/drivers/media/video/videodev.c
index 31e8af0ba27..67a661cf521 100644
--- a/drivers/media/video/videodev.c
+++ b/drivers/media/video/videodev.c
@@ -51,12 +51,51 @@
 #define VIDEO_NUM_DEVICES	256
 #define VIDEO_NAME              "video4linux"
 
+struct std_descr {
+	v4l2_std_id std;
+	const char *descr;
+};
+
+static const struct std_descr standards[] = {
+	{ V4L2_STD_NTSC, 	"NTSC"      },
+	{ V4L2_STD_NTSC_M, 	"NTSC-M"    },
+	{ V4L2_STD_NTSC_M_JP, 	"NTSC-M-JP" },
+	{ V4L2_STD_NTSC_M_KR,	"NTSC-M-KR" },
+	{ V4L2_STD_NTSC_443, 	"NTSC-443"  },
+	{ V4L2_STD_PAL, 	"PAL"       },
+	{ V4L2_STD_PAL_BG, 	"PAL-BG"    },
+	{ V4L2_STD_PAL_B, 	"PAL-B"     },
+	{ V4L2_STD_PAL_B1, 	"PAL-B1"    },
+	{ V4L2_STD_PAL_G, 	"PAL-G"     },
+	{ V4L2_STD_PAL_H, 	"PAL-H"     },
+	{ V4L2_STD_PAL_I, 	"PAL-I"     },
+	{ V4L2_STD_PAL_DK, 	"PAL-DK"    },
+	{ V4L2_STD_PAL_D, 	"PAL-D"     },
+	{ V4L2_STD_PAL_D1, 	"PAL-D1"    },
+	{ V4L2_STD_PAL_K, 	"PAL-K"     },
+	{ V4L2_STD_PAL_M, 	"PAL-M"     },
+	{ V4L2_STD_PAL_N, 	"PAL-N"     },
+	{ V4L2_STD_PAL_Nc, 	"PAL-Nc"    },
+	{ V4L2_STD_PAL_60, 	"PAL-60"    },
+	{ V4L2_STD_SECAM, 	"SECAM"     },
+	{ V4L2_STD_SECAM_B, 	"SECAM-B"   },
+	{ V4L2_STD_SECAM_G, 	"SECAM-G"   },
+	{ V4L2_STD_SECAM_H, 	"SECAM-H"   },
+	{ V4L2_STD_SECAM_DK, 	"SECAM-DK"  },
+	{ V4L2_STD_SECAM_D, 	"SECAM-D"   },
+	{ V4L2_STD_SECAM_K, 	"SECAM-K"   },
+	{ V4L2_STD_SECAM_K1, 	"SECAM-K1"  },
+	{ V4L2_STD_SECAM_L, 	"SECAM-L"   },
+	{ V4L2_STD_SECAM_LC, 	"SECAM-Lc"  },
+	{ 0, 			"Unknown"   }
+};
+
 /* video4linux standard ID conversion to standard name
  */
-char *v4l2_norm_to_name(v4l2_std_id id)
+const char *v4l2_norm_to_name(v4l2_std_id id)
 {
-	char *name;
 	u32 myid = id;
+	int i;
 
 	/* HACK: ppc32 architecture doesn't have __ucmpdi2 function to handle
 	   64 bit comparations. So, on that architecture, with some gcc
@@ -64,110 +103,17 @@ char *v4l2_norm_to_name(v4l2_std_id id)
 	 */
 	BUG_ON(myid != id);
 
-	switch (myid) {
-	case V4L2_STD_PAL:
-		name = "PAL";
-		break;
-	case V4L2_STD_PAL_BG:
-		name = "PAL-BG";
-		break;
-	case V4L2_STD_PAL_DK:
-		name = "PAL-DK";
-		break;
-	case V4L2_STD_PAL_B:
-		name = "PAL-B";
-		break;
-	case V4L2_STD_PAL_B1:
-		name = "PAL-B1";
-		break;
-	case V4L2_STD_PAL_G:
-		name = "PAL-G";
-		break;
-	case V4L2_STD_PAL_H:
-		name = "PAL-H";
-		break;
-	case V4L2_STD_PAL_I:
-		name = "PAL-I";
-		break;
-	case V4L2_STD_PAL_D:
-		name = "PAL-D";
-		break;
-	case V4L2_STD_PAL_D1:
-		name = "PAL-D1";
-		break;
-	case V4L2_STD_PAL_K:
-		name = "PAL-K";
-		break;
-	case V4L2_STD_PAL_M:
-		name = "PAL-M";
-		break;
-	case V4L2_STD_PAL_N:
-		name = "PAL-N";
-		break;
-	case V4L2_STD_PAL_Nc:
-		name = "PAL-Nc";
-		break;
-	case V4L2_STD_PAL_60:
-		name = "PAL-60";
-		break;
-	case V4L2_STD_NTSC:
-		name = "NTSC";
-		break;
-	case V4L2_STD_NTSC_M:
-		name = "NTSC-M";
-		break;
-	case V4L2_STD_NTSC_M_JP:
-		name = "NTSC-M-JP";
-		break;
-	case V4L2_STD_NTSC_443:
-		name = "NTSC-443";
-		break;
-	case V4L2_STD_NTSC_M_KR:
-		name = "NTSC-M-KR";
-		break;
-	case V4L2_STD_SECAM:
-		name = "SECAM";
-		break;
-	case V4L2_STD_SECAM_DK:
-		name = "SECAM-DK";
-		break;
-	case V4L2_STD_SECAM_B:
-		name = "SECAM-B";
-		break;
-	case V4L2_STD_SECAM_D:
-		name = "SECAM-D";
-		break;
-	case V4L2_STD_SECAM_G:
-		name = "SECAM-G";
-		break;
-	case V4L2_STD_SECAM_H:
-		name = "SECAM-H";
-		break;
-	case V4L2_STD_SECAM_K:
-		name = "SECAM-K";
-		break;
-	case V4L2_STD_SECAM_K1:
-		name = "SECAM-K1";
-		break;
-	case V4L2_STD_SECAM_L:
-		name = "SECAM-L";
-		break;
-	case V4L2_STD_SECAM_LC:
-		name = "SECAM-LC";
-		break;
-	default:
-		name = "Unknown";
-		break;
-	}
-
-	return name;
+	for (i = 0; standards[i].std; i++)
+		if (myid == standards[i].std)
+			break;
+	return standards[i].descr;
 }
 EXPORT_SYMBOL(v4l2_norm_to_name);
 
 /* Fill in the fields of a v4l2_standard structure according to the
    'id' and 'transmission' parameters.  Returns negative on error.  */
 int v4l2_video_std_construct(struct v4l2_standard *vs,
-			     int id, char *name)
+			     int id, const char *name)
 {
 	u32 index = vs->index;
 
@@ -1218,95 +1164,40 @@ static int __video_do_ioctl(struct inode *inode, struct file *file,
 	case VIDIOC_ENUMSTD:
 	{
 		struct v4l2_standard *p = arg;
-		v4l2_std_id id = vfd->tvnorms,curr_id=0;
-		unsigned int index = p->index,i;
-
-		if (index<0) {
-			ret=-EINVAL;
-			break;
-		}
-
-		/* Return norm array on a canonical way */
-		for (i=0;i<= index && id; i++) {
-			if ( (id & V4L2_STD_PAL) == V4L2_STD_PAL) {
-				curr_id = V4L2_STD_PAL;
-			} else if ( (id & V4L2_STD_PAL_BG) == V4L2_STD_PAL_BG) {
-				curr_id = V4L2_STD_PAL_BG;
-			} else if ( (id & V4L2_STD_PAL_DK) == V4L2_STD_PAL_DK) {
-				curr_id = V4L2_STD_PAL_DK;
-			} else if ( (id & V4L2_STD_PAL_B) == V4L2_STD_PAL_B) {
-				curr_id = V4L2_STD_PAL_B;
-			} else if ( (id & V4L2_STD_PAL_B1) == V4L2_STD_PAL_B1) {
-				curr_id = V4L2_STD_PAL_B1;
-			} else if ( (id & V4L2_STD_PAL_G) == V4L2_STD_PAL_G) {
-				curr_id = V4L2_STD_PAL_G;
-			} else if ( (id & V4L2_STD_PAL_H) == V4L2_STD_PAL_H) {
-				curr_id = V4L2_STD_PAL_H;
-			} else if ( (id & V4L2_STD_PAL_I) == V4L2_STD_PAL_I) {
-				curr_id = V4L2_STD_PAL_I;
-			} else if ( (id & V4L2_STD_PAL_D) == V4L2_STD_PAL_D) {
-				curr_id = V4L2_STD_PAL_D;
-			} else if ( (id & V4L2_STD_PAL_D1) == V4L2_STD_PAL_D1) {
-				curr_id = V4L2_STD_PAL_D1;
-			} else if ( (id & V4L2_STD_PAL_K) == V4L2_STD_PAL_K) {
-				curr_id = V4L2_STD_PAL_K;
-			} else if ( (id & V4L2_STD_PAL_M) == V4L2_STD_PAL_M) {
-				curr_id = V4L2_STD_PAL_M;
-			} else if ( (id & V4L2_STD_PAL_N) == V4L2_STD_PAL_N) {
-				curr_id = V4L2_STD_PAL_N;
-			} else if ( (id & V4L2_STD_PAL_Nc) == V4L2_STD_PAL_Nc) {
-				curr_id = V4L2_STD_PAL_Nc;
-			} else if ( (id & V4L2_STD_PAL_60) == V4L2_STD_PAL_60) {
-				curr_id = V4L2_STD_PAL_60;
-			} else if ( (id & V4L2_STD_NTSC) == V4L2_STD_NTSC) {
-				curr_id = V4L2_STD_NTSC;
-			} else if ( (id & V4L2_STD_NTSC_M) == V4L2_STD_NTSC_M) {
-				curr_id = V4L2_STD_NTSC_M;
-			} else if ( (id & V4L2_STD_NTSC_M_JP) == V4L2_STD_NTSC_M_JP) {
-				curr_id = V4L2_STD_NTSC_M_JP;
-			} else if ( (id & V4L2_STD_NTSC_443) == V4L2_STD_NTSC_443) {
-				curr_id = V4L2_STD_NTSC_443;
-			} else if ( (id & V4L2_STD_NTSC_M_KR) == V4L2_STD_NTSC_M_KR) {
-				curr_id = V4L2_STD_NTSC_M_KR;
-			} else if ( (id & V4L2_STD_SECAM) == V4L2_STD_SECAM) {
-				curr_id = V4L2_STD_SECAM;
-			} else if ( (id & V4L2_STD_SECAM_DK) == V4L2_STD_SECAM_DK) {
-				curr_id = V4L2_STD_SECAM_DK;
-			} else if ( (id & V4L2_STD_SECAM_B) == V4L2_STD_SECAM_B) {
-				curr_id = V4L2_STD_SECAM_B;
-			} else if ( (id & V4L2_STD_SECAM_D) == V4L2_STD_SECAM_D) {
-				curr_id = V4L2_STD_SECAM_D;
-			} else if ( (id & V4L2_STD_SECAM_G) == V4L2_STD_SECAM_G) {
-				curr_id = V4L2_STD_SECAM_G;
-			} else if ( (id & V4L2_STD_SECAM_H) == V4L2_STD_SECAM_H) {
-				curr_id = V4L2_STD_SECAM_H;
-			} else if ( (id & V4L2_STD_SECAM_K) == V4L2_STD_SECAM_K) {
-				curr_id = V4L2_STD_SECAM_K;
-			} else if ( (id & V4L2_STD_SECAM_K1) == V4L2_STD_SECAM_K1) {
-				curr_id = V4L2_STD_SECAM_K1;
-			} else if ( (id & V4L2_STD_SECAM_L) == V4L2_STD_SECAM_L) {
-				curr_id = V4L2_STD_SECAM_L;
-			} else if ( (id & V4L2_STD_SECAM_LC) == V4L2_STD_SECAM_LC) {
-				curr_id = V4L2_STD_SECAM_LC;
-			} else {
+		v4l2_std_id id = vfd->tvnorms, curr_id = 0;
+		unsigned int index = p->index, i, j = 0;
+		const char *descr = "";
+
+		/* Return norm array in a canonical way */
+		for (i = 0; i <= index && id; i++) {
+			/* last std value in the standards array is 0, so this
+			   while always ends there since (id & 0) == 0. */
+			while ((id & standards[j].std) != standards[j].std)
+				j++;
+			curr_id = standards[j].std;
+			descr = standards[j].descr;
+			j++;
+			if (curr_id == 0)
 				break;
-			}
-			id &= ~curr_id;
+			if (curr_id != V4L2_STD_PAL &&
+			    curr_id != V4L2_STD_SECAM &&
+			    curr_id != V4L2_STD_NTSC)
+				id &= ~curr_id;
 		}
-		if (i<=index)
+		if (i <= index)
 			return -EINVAL;
 
-		v4l2_video_std_construct(p, curr_id,v4l2_norm_to_name(curr_id));
+		v4l2_video_std_construct(p, curr_id, descr);
 		p->index = index;
 
-		dbgarg (cmd, "index=%d, id=%Ld, name=%s, fps=%d/%d, "
+		dbgarg(cmd, "index=%d, id=%Ld, name=%s, fps=%d/%d, "
 				"framelines=%d\n", p->index,
 				(unsigned long long)p->id, p->name,
 				p->frameperiod.numerator,
 				p->frameperiod.denominator,
 				p->framelines);
 
-		ret=0;
+		ret = 0;
 		break;
 	}
 	case VIDIOC_G_STD:
diff --git a/drivers/media/video/vivi.c b/drivers/media/video/vivi.c
index 845be1864f6..5ff9a58b613 100644
--- a/drivers/media/video/vivi.c
+++ b/drivers/media/video/vivi.c
@@ -327,13 +327,14 @@ static void vivi_fillbuff(struct vivi_dev *dev, struct vivi_buffer *buf)
 	int hmax  = buf->vb.height;
 	int wmax  = buf->vb.width;
 	struct timeval ts;
-	char *tmpbuf = kmalloc(wmax * 2, GFP_ATOMIC);
+	char *tmpbuf;
 	void *vbuf = videobuf_to_vmalloc(&buf->vb);
 
-	if (!tmpbuf)
+	if (!vbuf)
 		return;
 
-	if (!vbuf)
+	tmpbuf = kmalloc(wmax * 2, GFP_ATOMIC);
+	if (!tmpbuf)
 		return;
 
 	for (h = 0; h < hmax; h++) {