[ALSA] Enable the analog loopback of the Revolution 5.1

Enable the analog loopback of the Revolution 5.1 card.
This patch adds support for the PT2258 volume controller and modifies
the Revolution 5.1 driver to make use of this facility.  This allows
to control the analog loopback of the card.

Signed-off-by: Jochen Voss <voss@seehuhn.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

1 files changed, 122 insertions, 10 deletions

diff --git a/sound/pci/ice1712/revo.c b/sound/pci/ice1712/revo.c
index d556de59b9a..233e9a5a2e7 100644
--- a/sound/pci/ice1712/revo.c
+++ b/sound/pci/ice1712/revo.c
@@ -84,6 +84,102 @@ static void revo_set_rate_val(struct snd_akm4xxx *ak, unsigned int rate)
 }
 
 /*
+ * I2C access to the PT2258 volume controller on GPIO 6/7 (Revolution 5.1)
+ */
+
+static void revo_i2c_start(struct snd_i2c_bus *bus)
+{
+	struct snd_ice1712 *ice = bus->private_data;
+	snd_ice1712_save_gpio_status(ice);
+}
+
+static void revo_i2c_stop(struct snd_i2c_bus *bus)
+{
+	struct snd_ice1712 *ice = bus->private_data;
+	snd_ice1712_restore_gpio_status(ice);
+}
+
+static void revo_i2c_direction(struct snd_i2c_bus *bus, int clock, int data)
+{
+	struct snd_ice1712 *ice = bus->private_data;
+	unsigned int mask, val;
+
+	val = 0;
+	if (clock)
+		val |= VT1724_REVO_I2C_CLOCK;	/* write SCL */
+	if (data)
+		val |= VT1724_REVO_I2C_DATA;	/* write SDA */
+	mask = VT1724_REVO_I2C_CLOCK | VT1724_REVO_I2C_DATA;
+	ice->gpio.direction &= ~mask;
+	ice->gpio.direction |= val;
+	snd_ice1712_gpio_set_dir(ice, ice->gpio.direction);
+	snd_ice1712_gpio_set_mask(ice, ~mask);
+}
+
+static void revo_i2c_setlines(struct snd_i2c_bus *bus, int clk, int data)
+{
+	struct snd_ice1712 *ice = bus->private_data;
+	unsigned int val = 0;
+
+	if (clk)
+		val |= VT1724_REVO_I2C_CLOCK;
+	if (data)
+		val |= VT1724_REVO_I2C_DATA;
+	snd_ice1712_gpio_write_bits(ice,
+				    VT1724_REVO_I2C_DATA |
+				    VT1724_REVO_I2C_CLOCK, val);
+	udelay(5);
+}
+
+static int revo_i2c_getdata(struct snd_i2c_bus *bus, int ack)
+{
+	struct snd_ice1712 *ice = bus->private_data;
+	int bit;
+
+	if (ack)
+		udelay(5);
+	bit = snd_ice1712_gpio_read_bits(ice, VT1724_REVO_I2C_DATA) ? 1 : 0;
+	return bit;
+}
+
+static struct snd_i2c_bit_ops revo51_bit_ops = {
+	.start = revo_i2c_start,
+	.stop = revo_i2c_stop,
+	.direction = revo_i2c_direction,
+	.setlines = revo_i2c_setlines,
+	.getdata = revo_i2c_getdata,
+};
+
+static int revo51_i2c_init(struct snd_ice1712 *ice,
+			   struct snd_pt2258 *pt)
+{
+	int err;
+
+	/* create the I2C bus */
+	err = snd_i2c_bus_create(ice->card, "ICE1724 GPIO6", NULL, &ice->i2c);
+	if (err < 0)
+		return err;
+
+	ice->i2c->private_data = ice;
+	ice->i2c->hw_ops.bit = &revo51_bit_ops;
+
+	/* create the I2C device */
+	err = snd_i2c_device_create(ice->i2c, "PT2258", 0x40,
+				    &ice->spec.revo51.dev);
+	if (err < 0)
+		return err;
+
+	pt->card = ice->card;
+	pt->i2c_bus = ice->i2c;
+	pt->i2c_dev = ice->spec.revo51.dev;
+	ice->spec.revo51.pt2258 = pt;
+
+	snd_pt2258_reset(pt);
+
+	return 0;
+}
+
+/*
  * initialize the chips on M-Audio Revolution cards
  */
 
@@ -180,9 +276,9 @@ static struct snd_ak4xxx_private akm_revo51_priv __devinitdata = {
 	.cif = 0,
 	.data_mask = VT1724_REVO_CDOUT,
 	.clk_mask = VT1724_REVO_CCLK,
-	.cs_mask = VT1724_REVO_CS0 | VT1724_REVO_CS1 | VT1724_REVO_CS2,
-	.cs_addr = VT1724_REVO_CS1 | VT1724_REVO_CS2,
-	.cs_none = VT1724_REVO_CS0 | VT1724_REVO_CS1 | VT1724_REVO_CS2,
+	.cs_mask = VT1724_REVO_CS0 | VT1724_REVO_CS1,
+	.cs_addr = VT1724_REVO_CS1,
+	.cs_none = VT1724_REVO_CS0 | VT1724_REVO_CS1,
 	.add_flags = VT1724_REVO_CCLK, /* high at init */
 	.mask_flags = 0,
 };
@@ -198,13 +294,15 @@ static struct snd_ak4xxx_private akm_revo51_adc_priv __devinitdata = {
 	.cif = 0,
 	.data_mask = VT1724_REVO_CDOUT,
 	.clk_mask = VT1724_REVO_CCLK,
-	.cs_mask = VT1724_REVO_CS0 | VT1724_REVO_CS1 | VT1724_REVO_CS2,
-	.cs_addr = VT1724_REVO_CS0 | VT1724_REVO_CS2,
-	.cs_none = VT1724_REVO_CS0 | VT1724_REVO_CS1 | VT1724_REVO_CS2,
+	.cs_mask = VT1724_REVO_CS0 | VT1724_REVO_CS1,
+	.cs_addr = VT1724_REVO_CS0,
+	.cs_none = VT1724_REVO_CS0 | VT1724_REVO_CS1,
 	.add_flags = VT1724_REVO_CCLK, /* high at init */
 	.mask_flags = 0,
 };
 
+static struct snd_pt2258 ptc_revo51_volume;
+
 static int __devinit revo_init(struct snd_ice1712 *ice)
 {
 	struct snd_akm4xxx *ak;
@@ -243,14 +341,20 @@ static int __devinit revo_init(struct snd_ice1712 *ice)
 		break;
 	case VT1724_SUBDEVICE_REVOLUTION51:
 		ice->akm_codecs = 2;
-		if ((err = snd_ice1712_akm4xxx_init(ak, &akm_revo51, &akm_revo51_priv, ice)) < 0)
+		err = snd_ice1712_akm4xxx_init(ak, &akm_revo51,
+					       &akm_revo51_priv, ice);
+		if (err < 0)
 			return err;
-		err = snd_ice1712_akm4xxx_init(ak + 1, &akm_revo51_adc,
+		err = snd_ice1712_akm4xxx_init(ak+1, &akm_revo51_adc,
 					       &akm_revo51_adc_priv, ice);
 		if (err < 0)
 			return err;
-		/* unmute all codecs - needed! */
-		snd_ice1712_gpio_write_bits(ice, VT1724_REVO_MUTE, VT1724_REVO_MUTE);
+		err = revo51_i2c_init(ice, &ptc_revo51_volume);
+		if (err < 0)
+			return err;
+		/* unmute all codecs */
+		snd_ice1712_gpio_write_bits(ice, VT1724_REVO_MUTE,
+					    VT1724_REVO_MUTE);
 		break;
 	}
 
@@ -264,10 +368,18 @@ static int __devinit revo_add_controls(struct snd_ice1712 *ice)
 
 	switch (ice->eeprom.subvendor) {
 	case VT1724_SUBDEVICE_REVOLUTION71:
+		err = snd_ice1712_akm4xxx_build_controls(ice);
+		if (err < 0)
+			return err;
+		break;
 	case VT1724_SUBDEVICE_REVOLUTION51:
 		err = snd_ice1712_akm4xxx_build_controls(ice);
 		if (err < 0)
 			return err;
+		err = snd_pt2258_build_controls(ice->spec.revo51.pt2258);
+		if (err < 0)
+			return err;
+		break;
 	}
 	return 0;
 }