[media] move the dvb/frontends to drivers/media/dvb-frontends

Raise the DVB frontends one level up, as the intention is to remove
the drivers/media/dvb directory.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 831 insertions, 0 deletions

diff --git a/drivers/media/dvb-frontends/lgdt330x.c b/drivers/media/dvb-frontends/lgdt330x.c
new file mode 100644
index 00000000000..e046622df0e
--- /dev/null
+++ b/drivers/media/dvb-frontends/lgdt330x.c
@@ -0,0 +1,831 @@
+/*
+ *    Support for LGDT3302 and LGDT3303 - VSB/QAM
+ *
+ *    Copyright (C) 2005 Wilson Michaels <wilsonmichaels@earthlink.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.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU General Public License for more details.
+ *
+ *    You should have received a copy of the GNU General Public License
+ *    along with this program; if not, write to the Free Software
+ *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+/*
+ *                      NOTES ABOUT THIS DRIVER
+ *
+ * This Linux driver supports:
+ *   DViCO FusionHDTV 3 Gold-Q
+ *   DViCO FusionHDTV 3 Gold-T
+ *   DViCO FusionHDTV 5 Gold
+ *   DViCO FusionHDTV 5 Lite
+ *   DViCO FusionHDTV 5 USB Gold
+ *   Air2PC/AirStar 2 ATSC 3rd generation (HD5000)
+ *   pcHDTV HD5500
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <asm/byteorder.h>
+
+#include "dvb_frontend.h"
+#include "dvb_math.h"
+#include "lgdt330x_priv.h"
+#include "lgdt330x.h"
+
+/* Use Equalizer Mean Squared Error instead of Phaser Tracker MSE */
+/* #define USE_EQMSE */
+
+static int debug;
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug,"Turn on/off lgdt330x frontend debugging (default:off).");
+#define dprintk(args...) \
+do { \
+if (debug) printk(KERN_DEBUG "lgdt330x: " args); \
+} while (0)
+
+struct lgdt330x_state
+{
+	struct i2c_adapter* i2c;
+
+	/* Configuration settings */
+	const struct lgdt330x_config* config;
+
+	struct dvb_frontend frontend;
+
+	/* Demodulator private data */
+	fe_modulation_t current_modulation;
+	u32 snr; /* Result of last SNR calculation */
+
+	/* Tuner private data */
+	u32 current_frequency;
+};
+
+static int i2c_write_demod_bytes (struct lgdt330x_state* state,
+				  u8 *buf, /* data bytes to send */
+				  int len  /* number of bytes to send */ )
+{
+	struct i2c_msg msg =
+		{ .addr = state->config->demod_address,
+		  .flags = 0,
+		  .buf = buf,
+		  .len = 2 };
+	int i;
+	int err;
+
+	for (i=0; i<len-1; i+=2){
+		if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1) {
+			printk(KERN_WARNING "lgdt330x: %s error (addr %02x <- %02x, err = %i)\n", __func__, msg.buf[0], msg.buf[1], err);
+			if (err < 0)
+				return err;
+			else
+				return -EREMOTEIO;
+		}
+		msg.buf += 2;
+	}
+	return 0;
+}
+
+/*
+ * This routine writes the register (reg) to the demod bus
+ * then reads the data returned for (len) bytes.
+ */
+
+static int i2c_read_demod_bytes(struct lgdt330x_state *state,
+				enum I2C_REG reg, u8 *buf, int len)
+{
+	u8 wr [] = { reg };
+	struct i2c_msg msg [] = {
+		{ .addr = state->config->demod_address,
+		  .flags = 0, .buf = wr,  .len = 1 },
+		{ .addr = state->config->demod_address,
+		  .flags = I2C_M_RD, .buf = buf, .len = len },
+	};
+	int ret;
+	ret = i2c_transfer(state->i2c, msg, 2);
+	if (ret != 2) {
+		printk(KERN_WARNING "lgdt330x: %s: addr 0x%02x select 0x%02x error (ret == %i)\n", __func__, state->config->demod_address, reg, ret);
+		if (ret >= 0)
+			ret = -EIO;
+	} else {
+		ret = 0;
+	}
+	return ret;
+}
+
+/* Software reset */
+static int lgdt3302_SwReset(struct lgdt330x_state* state)
+{
+	u8 ret;
+	u8 reset[] = {
+		IRQ_MASK,
+		0x00 /* bit 6 is active low software reset
+		      *	bits 5-0 are 1 to mask interrupts */
+	};
+
+	ret = i2c_write_demod_bytes(state,
+				    reset, sizeof(reset));
+	if (ret == 0) {
+
+		/* force reset high (inactive) and unmask interrupts */
+		reset[1] = 0x7f;
+		ret = i2c_write_demod_bytes(state,
+					    reset, sizeof(reset));
+	}
+	return ret;
+}
+
+static int lgdt3303_SwReset(struct lgdt330x_state* state)
+{
+	u8 ret;
+	u8 reset[] = {
+		0x02,
+		0x00 /* bit 0 is active low software reset */
+	};
+
+	ret = i2c_write_demod_bytes(state,
+				    reset, sizeof(reset));
+	if (ret == 0) {
+
+		/* force reset high (inactive) */
+		reset[1] = 0x01;
+		ret = i2c_write_demod_bytes(state,
+					    reset, sizeof(reset));
+	}
+	return ret;
+}
+
+static int lgdt330x_SwReset(struct lgdt330x_state* state)
+{
+	switch (state->config->demod_chip) {
+	case LGDT3302:
+		return lgdt3302_SwReset(state);
+	case LGDT3303:
+		return lgdt3303_SwReset(state);
+	default:
+		return -ENODEV;
+	}
+}
+
+static int lgdt330x_init(struct dvb_frontend* fe)
+{
+	/* Hardware reset is done using gpio[0] of cx23880x chip.
+	 * I'd like to do it here, but don't know how to find chip address.
+	 * cx88-cards.c arranges for the reset bit to be inactive (high).
+	 * Maybe there needs to be a callable function in cx88-core or
+	 * the caller of this function needs to do it. */
+
+	/*
+	 * Array of byte pairs <address, value>
+	 * to initialize each different chip
+	 */
+	static u8 lgdt3302_init_data[] = {
+		/* Use 50MHz parameter values from spec sheet since xtal is 50 */
+		/* Change the value of NCOCTFV[25:0] of carrier
+		   recovery center frequency register */
+		VSB_CARRIER_FREQ0, 0x00,
+		VSB_CARRIER_FREQ1, 0x87,
+		VSB_CARRIER_FREQ2, 0x8e,
+		VSB_CARRIER_FREQ3, 0x01,
+		/* Change the TPCLK pin polarity
+		   data is valid on falling clock */
+		DEMUX_CONTROL, 0xfb,
+		/* Change the value of IFBW[11:0] of
+		   AGC IF/RF loop filter bandwidth register */
+		AGC_RF_BANDWIDTH0, 0x40,
+		AGC_RF_BANDWIDTH1, 0x93,
+		AGC_RF_BANDWIDTH2, 0x00,
+		/* Change the value of bit 6, 'nINAGCBY' and
+		   'NSSEL[1:0] of ACG function control register 2 */
+		AGC_FUNC_CTRL2, 0xc6,
+		/* Change the value of bit 6 'RFFIX'
+		   of AGC function control register 3 */
+		AGC_FUNC_CTRL3, 0x40,
+		/* Set the value of 'INLVTHD' register 0x2a/0x2c
+		   to 0x7fe */
+		AGC_DELAY0, 0x07,
+		AGC_DELAY2, 0xfe,
+		/* Change the value of IAGCBW[15:8]
+		   of inner AGC loop filter bandwidth */
+		AGC_LOOP_BANDWIDTH0, 0x08,
+		AGC_LOOP_BANDWIDTH1, 0x9a
+	};
+
+	static u8 lgdt3303_init_data[] = {
+		0x4c, 0x14
+	};
+
+	static u8 flip_1_lgdt3303_init_data[] = {
+		0x4c, 0x14,
+		0x87, 0xf3
+	};
+
+	static u8 flip_2_lgdt3303_init_data[] = {
+		0x4c, 0x14,
+		0x87, 0xda
+	};
+
+	struct lgdt330x_state* state = fe->demodulator_priv;
+	char  *chip_name;
+	int    err;
+
+	switch (state->config->demod_chip) {
+	case LGDT3302:
+		chip_name = "LGDT3302";
+		err = i2c_write_demod_bytes(state, lgdt3302_init_data,
+					    sizeof(lgdt3302_init_data));
+		break;
+	case LGDT3303:
+		chip_name = "LGDT3303";
+		switch (state->config->clock_polarity_flip) {
+		case 2:
+			err = i2c_write_demod_bytes(state,
+					flip_2_lgdt3303_init_data,
+					sizeof(flip_2_lgdt3303_init_data));
+			break;
+		case 1:
+			err = i2c_write_demod_bytes(state,
+					flip_1_lgdt3303_init_data,
+					sizeof(flip_1_lgdt3303_init_data));
+			break;
+		case 0:
+		default:
+			err = i2c_write_demod_bytes(state, lgdt3303_init_data,
+						    sizeof(lgdt3303_init_data));
+		}
+		break;
+	default:
+		chip_name = "undefined";
+		printk (KERN_WARNING "Only LGDT3302 and LGDT3303 are supported chips.\n");
+		err = -ENODEV;
+	}
+	dprintk("%s entered as %s\n", __func__, chip_name);
+	if (err < 0)
+		return err;
+	return lgdt330x_SwReset(state);
+}
+
+static int lgdt330x_read_ber(struct dvb_frontend* fe, u32* ber)
+{
+	*ber = 0; /* Not supplied by the demod chips */
+	return 0;
+}
+
+static int lgdt330x_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
+{
+	struct lgdt330x_state* state = fe->demodulator_priv;
+	int err;
+	u8 buf[2];
+
+	*ucblocks = 0;
+
+	switch (state->config->demod_chip) {
+	case LGDT3302:
+		err = i2c_read_demod_bytes(state, LGDT3302_PACKET_ERR_COUNTER1,
+					   buf, sizeof(buf));
+		break;
+	case LGDT3303:
+		err = i2c_read_demod_bytes(state, LGDT3303_PACKET_ERR_COUNTER1,
+					   buf, sizeof(buf));
+		break;
+	default:
+		printk(KERN_WARNING
+		       "Only LGDT3302 and LGDT3303 are supported chips.\n");
+		err = -ENODEV;
+	}
+	if (err < 0)
+		return err;
+
+	*ucblocks = (buf[0] << 8) | buf[1];
+	return 0;
+}
+
+static int lgdt330x_set_parameters(struct dvb_frontend *fe)
+{
+	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
+	/*
+	 * Array of byte pairs <address, value>
+	 * to initialize 8VSB for lgdt3303 chip 50 MHz IF
+	 */
+	static u8 lgdt3303_8vsb_44_data[] = {
+		0x04, 0x00,
+		0x0d, 0x40,
+		0x0e, 0x87,
+		0x0f, 0x8e,
+		0x10, 0x01,
+		0x47, 0x8b };
+
+	/*
+	 * Array of byte pairs <address, value>
+	 * to initialize QAM for lgdt3303 chip
+	 */
+	static u8 lgdt3303_qam_data[] = {
+		0x04, 0x00,
+		0x0d, 0x00,
+		0x0e, 0x00,
+		0x0f, 0x00,
+		0x10, 0x00,
+		0x51, 0x63,
+		0x47, 0x66,
+		0x48, 0x66,
+		0x4d, 0x1a,
+		0x49, 0x08,
+		0x4a, 0x9b };
+
+	struct lgdt330x_state* state = fe->demodulator_priv;
+
+	static u8 top_ctrl_cfg[]   = { TOP_CONTROL, 0x03 };
+
+	int err = 0;
+	/* Change only if we are actually changing the modulation */
+	if (state->current_modulation != p->modulation) {
+		switch (p->modulation) {
+		case VSB_8:
+			dprintk("%s: VSB_8 MODE\n", __func__);
+
+			/* Select VSB mode */
+			top_ctrl_cfg[1] = 0x03;
+
+			/* Select ANT connector if supported by card */
+			if (state->config->pll_rf_set)
+				state->config->pll_rf_set(fe, 1);
+
+			if (state->config->demod_chip == LGDT3303) {
+				err = i2c_write_demod_bytes(state, lgdt3303_8vsb_44_data,
+							    sizeof(lgdt3303_8vsb_44_data));
+			}
+			break;
+
+		case QAM_64:
+			dprintk("%s: QAM_64 MODE\n", __func__);
+
+			/* Select QAM_64 mode */
+			top_ctrl_cfg[1] = 0x00;
+
+			/* Select CABLE connector if supported by card */
+			if (state->config->pll_rf_set)
+				state->config->pll_rf_set(fe, 0);
+
+			if (state->config->demod_chip == LGDT3303) {
+				err = i2c_write_demod_bytes(state, lgdt3303_qam_data,
+											sizeof(lgdt3303_qam_data));
+			}
+			break;
+
+		case QAM_256:
+			dprintk("%s: QAM_256 MODE\n", __func__);
+
+			/* Select QAM_256 mode */
+			top_ctrl_cfg[1] = 0x01;
+
+			/* Select CABLE connector if supported by card */
+			if (state->config->pll_rf_set)
+				state->config->pll_rf_set(fe, 0);
+
+			if (state->config->demod_chip == LGDT3303) {
+				err = i2c_write_demod_bytes(state, lgdt3303_qam_data,
+											sizeof(lgdt3303_qam_data));
+			}
+			break;
+		default:
+			printk(KERN_WARNING "lgdt330x: %s: Modulation type(%d) UNSUPPORTED\n", __func__, p->modulation);
+			return -1;
+		}
+		if (err < 0)
+			printk(KERN_WARNING "lgdt330x: %s: error blasting "
+			       "bytes to lgdt3303 for modulation type(%d)\n",
+			       __func__, p->modulation);
+
+		/*
+		 * select serial or parallel MPEG harware interface
+		 * Serial:   0x04 for LGDT3302 or 0x40 for LGDT3303
+		 * Parallel: 0x00
+		 */
+		top_ctrl_cfg[1] |= state->config->serial_mpeg;
+
+		/* Select the requested mode */
+		i2c_write_demod_bytes(state, top_ctrl_cfg,
+				      sizeof(top_ctrl_cfg));
+		if (state->config->set_ts_params)
+			state->config->set_ts_params(fe, 0);
+		state->current_modulation = p->modulation;
+	}
+
+	/* Tune to the specified frequency */
+	if (fe->ops.tuner_ops.set_params) {
+		fe->ops.tuner_ops.set_params(fe);
+		if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
+	}
+
+	/* Keep track of the new frequency */
+	/* FIXME this is the wrong way to do this...           */
+	/* The tuner is shared with the video4linux analog API */
+	state->current_frequency = p->frequency;
+
+	lgdt330x_SwReset(state);
+	return 0;
+}
+
+static int lgdt330x_get_frontend(struct dvb_frontend *fe)
+{
+	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
+	struct lgdt330x_state *state = fe->demodulator_priv;
+	p->frequency = state->current_frequency;
+	return 0;
+}
+
+static int lgdt3302_read_status(struct dvb_frontend* fe, fe_status_t* status)
+{
+	struct lgdt330x_state* state = fe->demodulator_priv;
+	u8 buf[3];
+
+	*status = 0; /* Reset status result */
+
+	/* AGC status register */
+	i2c_read_demod_bytes(state, AGC_STATUS, buf, 1);
+	dprintk("%s: AGC_STATUS = 0x%02x\n", __func__, buf[0]);
+	if ((buf[0] & 0x0c) == 0x8){
+		/* Test signal does not exist flag */
+		/* as well as the AGC lock flag.   */
+		*status |= FE_HAS_SIGNAL;
+	}
+
+	/*
+	 * You must set the Mask bits to 1 in the IRQ_MASK in order
+	 * to see that status bit in the IRQ_STATUS register.
+	 * This is done in SwReset();
+	 */
+	/* signal status */
+	i2c_read_demod_bytes(state, TOP_CONTROL, buf, sizeof(buf));
+	dprintk("%s: TOP_CONTROL = 0x%02x, IRO_MASK = 0x%02x, IRQ_STATUS = 0x%02x\n", __func__, buf[0], buf[1], buf[2]);
+
+
+	/* sync status */
+	if ((buf[2] & 0x03) == 0x01) {
+		*status |= FE_HAS_SYNC;
+	}
+
+	/* FEC error status */
+	if ((buf[2] & 0x0c) == 0x08) {
+		*status |= FE_HAS_LOCK;
+		*status |= FE_HAS_VITERBI;
+	}
+
+	/* Carrier Recovery Lock Status Register */
+	i2c_read_demod_bytes(state, CARRIER_LOCK, buf, 1);
+	dprintk("%s: CARRIER_LOCK = 0x%02x\n", __func__, buf[0]);
+	switch (state->current_modulation) {
+	case QAM_256:
+	case QAM_64:
+		/* Need to understand why there are 3 lock levels here */
+		if ((buf[0] & 0x07) == 0x07)
+			*status |= FE_HAS_CARRIER;
+		break;
+	case VSB_8:
+		if ((buf[0] & 0x80) == 0x80)
+			*status |= FE_HAS_CARRIER;
+		break;
+	default:
+		printk(KERN_WARNING "lgdt330x: %s: Modulation set to unsupported value\n", __func__);
+	}
+
+	return 0;
+}
+
+static int lgdt3303_read_status(struct dvb_frontend* fe, fe_status_t* status)
+{
+	struct lgdt330x_state* state = fe->demodulator_priv;
+	int err;
+	u8 buf[3];
+
+	*status = 0; /* Reset status result */
+
+	/* lgdt3303 AGC status register */
+	err = i2c_read_demod_bytes(state, 0x58, buf, 1);
+	if (err < 0)
+		return err;
+
+	dprintk("%s: AGC_STATUS = 0x%02x\n", __func__, buf[0]);
+	if ((buf[0] & 0x21) == 0x01){
+		/* Test input signal does not exist flag */
+		/* as well as the AGC lock flag.   */
+		*status |= FE_HAS_SIGNAL;
+	}
+
+	/* Carrier Recovery Lock Status Register */
+	i2c_read_demod_bytes(state, CARRIER_LOCK, buf, 1);
+	dprintk("%s: CARRIER_LOCK = 0x%02x\n", __func__, buf[0]);
+	switch (state->current_modulation) {
+	case QAM_256:
+	case QAM_64:
+		/* Need to understand why there are 3 lock levels here */
+		if ((buf[0] & 0x07) == 0x07)
+			*status |= FE_HAS_CARRIER;
+		else
+			break;
+		i2c_read_demod_bytes(state, 0x8a, buf, 1);
+		if ((buf[0] & 0x04) == 0x04)
+			*status |= FE_HAS_SYNC;
+		if ((buf[0] & 0x01) == 0x01)
+			*status |= FE_HAS_LOCK;
+		if ((buf[0] & 0x08) == 0x08)
+			*status |= FE_HAS_VITERBI;
+		break;
+	case VSB_8:
+		if ((buf[0] & 0x80) == 0x80)
+			*status |= FE_HAS_CARRIER;
+		else
+			break;
+		i2c_read_demod_bytes(state, 0x38, buf, 1);
+		if ((buf[0] & 0x02) == 0x00)
+			*status |= FE_HAS_SYNC;
+		if ((buf[0] & 0x01) == 0x01) {
+			*status |= FE_HAS_LOCK;
+			*status |= FE_HAS_VITERBI;
+		}
+		break;
+	default:
+		printk(KERN_WARNING "lgdt330x: %s: Modulation set to unsupported value\n", __func__);
+	}
+	return 0;
+}
+
+/* Calculate SNR estimation (scaled by 2^24)
+
+   8-VSB SNR equations from LGDT3302 and LGDT3303 datasheets, QAM
+   equations from LGDT3303 datasheet.  VSB is the same between the '02
+   and '03, so maybe QAM is too?  Perhaps someone with a newer datasheet
+   that has QAM information could verify?
+
+   For 8-VSB: (two ways, take your pick)
+   LGDT3302:
+     SNR_EQ = 10 * log10(25 * 24^2 / EQ_MSE)
+   LGDT3303:
+     SNR_EQ = 10 * log10(25 * 32^2 / EQ_MSE)
+   LGDT3302 & LGDT3303:
+     SNR_PT = 10 * log10(25 * 32^2 / PT_MSE)  (we use this one)
+   For 64-QAM:
+     SNR    = 10 * log10( 688128   / MSEQAM)
+   For 256-QAM:
+     SNR    = 10 * log10( 696320   / MSEQAM)
+
+   We re-write the snr equation as:
+     SNR * 2^24 = 10*(c - intlog10(MSE))
+   Where for 256-QAM, c = log10(696320) * 2^24, and so on. */
+
+static u32 calculate_snr(u32 mse, u32 c)
+{
+	if (mse == 0) /* No signal */
+		return 0;
+
+	mse = intlog10(mse);
+	if (mse > c) {
+		/* Negative SNR, which is possible, but realisticly the
+		demod will lose lock before the signal gets this bad.  The
+		API only allows for unsigned values, so just return 0 */
+		return 0;
+	}
+	return 10*(c - mse);
+}
+
+static int lgdt3302_read_snr(struct dvb_frontend* fe, u16* snr)
+{
+	struct lgdt330x_state* state = (struct lgdt330x_state*) fe->demodulator_priv;
+	u8 buf[5];	/* read data buffer */
+	u32 noise;	/* noise value */
+	u32 c;		/* per-modulation SNR calculation constant */
+
+	switch(state->current_modulation) {
+	case VSB_8:
+		i2c_read_demod_bytes(state, LGDT3302_EQPH_ERR0, buf, 5);
+#ifdef USE_EQMSE
+		/* Use Equalizer Mean-Square Error Register */
+		/* SNR for ranges from -15.61 to +41.58 */
+		noise = ((buf[0] & 7) << 16) | (buf[1] << 8) | buf[2];
+		c = 69765745; /* log10(25*24^2)*2^24 */
+#else
+		/* Use Phase Tracker Mean-Square Error Register */
+		/* SNR for ranges from -13.11 to +44.08 */
+		noise = ((buf[0] & 7<<3) << 13) | (buf[3] << 8) | buf[4];
+		c = 73957994; /* log10(25*32^2)*2^24 */
+#endif
+		break;
+	case QAM_64:
+	case QAM_256:
+		i2c_read_demod_bytes(state, CARRIER_MSEQAM1, buf, 2);
+		noise = ((buf[0] & 3) << 8) | buf[1];
+		c = state->current_modulation == QAM_64 ? 97939837 : 98026066;
+		/* log10(688128)*2^24 and log10(696320)*2^24 */
+		break;
+	default:
+		printk(KERN_ERR "lgdt330x: %s: Modulation set to unsupported value\n",
+		       __func__);
+		return -EREMOTEIO; /* return -EDRIVER_IS_GIBBERED; */
+	}
+
+	state->snr = calculate_snr(noise, c);
+	*snr = (state->snr) >> 16; /* Convert from 8.24 fixed-point to 8.8 */
+
+	dprintk("%s: noise = 0x%08x, snr = %d.%02d dB\n", __func__, noise,
+		state->snr >> 24, (((state->snr>>8) & 0xffff) * 100) >> 16);
+
+	return 0;
+}
+
+static int lgdt3303_read_snr(struct dvb_frontend* fe, u16* snr)
+{
+	struct lgdt330x_state* state = (struct lgdt330x_state*) fe->demodulator_priv;
+	u8 buf[5];	/* read data buffer */
+	u32 noise;	/* noise value */
+	u32 c;		/* per-modulation SNR calculation constant */
+
+	switch(state->current_modulation) {
+	case VSB_8:
+		i2c_read_demod_bytes(state, LGDT3303_EQPH_ERR0, buf, 5);
+#ifdef USE_EQMSE
+		/* Use Equalizer Mean-Square Error Register */
+		/* SNR for ranges from -16.12 to +44.08 */
+		noise = ((buf[0] & 0x78) << 13) | (buf[1] << 8) | buf[2];
+		c = 73957994; /* log10(25*32^2)*2^24 */
+#else
+		/* Use Phase Tracker Mean-Square Error Register */
+		/* SNR for ranges from -13.11 to +44.08 */
+		noise = ((buf[0] & 7) << 16) | (buf[3] << 8) | buf[4];
+		c = 73957994; /* log10(25*32^2)*2^24 */
+#endif
+		break;
+	case QAM_64:
+	case QAM_256:
+		i2c_read_demod_bytes(state, CARRIER_MSEQAM1, buf, 2);
+		noise = (buf[0] << 8) | buf[1];
+		c = state->current_modulation == QAM_64 ? 97939837 : 98026066;
+		/* log10(688128)*2^24 and log10(696320)*2^24 */
+		break;
+	default:
+		printk(KERN_ERR "lgdt330x: %s: Modulation set to unsupported value\n",
+		       __func__);
+		return -EREMOTEIO; /* return -EDRIVER_IS_GIBBERED; */
+	}
+
+	state->snr = calculate_snr(noise, c);
+	*snr = (state->snr) >> 16; /* Convert from 8.24 fixed-point to 8.8 */
+
+	dprintk("%s: noise = 0x%08x, snr = %d.%02d dB\n", __func__, noise,
+		state->snr >> 24, (((state->snr >> 8) & 0xffff) * 100) >> 16);
+
+	return 0;
+}
+
+static int lgdt330x_read_signal_strength(struct dvb_frontend* fe, u16* strength)
+{
+	/* Calculate Strength from SNR up to 35dB */
+	/* Even though the SNR can go higher than 35dB, there is some comfort */
+	/* factor in having a range of strong signals that can show at 100%   */
+	struct lgdt330x_state* state = (struct lgdt330x_state*) fe->demodulator_priv;
+	u16 snr;
+	int ret;
+
+	ret = fe->ops.read_snr(fe, &snr);
+	if (ret != 0)
+		return ret;
+	/* Rather than use the 8.8 value snr, use state->snr which is 8.24 */
+	/* scale the range 0 - 35*2^24 into 0 - 65535 */
+	if (state->snr >= 8960 * 0x10000)
+		*strength = 0xffff;
+	else
+		*strength = state->snr / 8960;
+
+	return 0;
+}
+
+static int lgdt330x_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fe_tune_settings)
+{
+	/* I have no idea about this - it may not be needed */
+	fe_tune_settings->min_delay_ms = 500;
+	fe_tune_settings->step_size = 0;
+	fe_tune_settings->max_drift = 0;
+	return 0;
+}
+
+static void lgdt330x_release(struct dvb_frontend* fe)
+{
+	struct lgdt330x_state* state = (struct lgdt330x_state*) fe->demodulator_priv;
+	kfree(state);
+}
+
+static struct dvb_frontend_ops lgdt3302_ops;
+static struct dvb_frontend_ops lgdt3303_ops;
+
+struct dvb_frontend* lgdt330x_attach(const struct lgdt330x_config* config,
+				     struct i2c_adapter* i2c)
+{
+	struct lgdt330x_state* state = NULL;
+	u8 buf[1];
+
+	/* Allocate memory for the internal state */
+	state = kzalloc(sizeof(struct lgdt330x_state), GFP_KERNEL);
+	if (state == NULL)
+		goto error;
+
+	/* Setup the state */
+	state->config = config;
+	state->i2c = i2c;
+
+	/* Create dvb_frontend */
+	switch (config->demod_chip) {
+	case LGDT3302:
+		memcpy(&state->frontend.ops, &lgdt3302_ops, sizeof(struct dvb_frontend_ops));
+		break;
+	case LGDT3303:
+		memcpy(&state->frontend.ops, &lgdt3303_ops, sizeof(struct dvb_frontend_ops));
+		break;
+	default:
+		goto error;
+	}
+	state->frontend.demodulator_priv = state;
+
+	/* Verify communication with demod chip */
+	if (i2c_read_demod_bytes(state, 2, buf, 1))
+		goto error;
+
+	state->current_frequency = -1;
+	state->current_modulation = -1;
+
+	return &state->frontend;
+
+error:
+	kfree(state);
+	dprintk("%s: ERROR\n",__func__);
+	return NULL;
+}
+
+static struct dvb_frontend_ops lgdt3302_ops = {
+	.delsys = { SYS_ATSC, SYS_DVBC_ANNEX_B },
+	.info = {
+		.name= "LG Electronics LGDT3302 VSB/QAM Frontend",
+		.frequency_min= 54000000,
+		.frequency_max= 858000000,
+		.frequency_stepsize= 62500,
+		.symbol_rate_min    = 5056941,	/* QAM 64 */
+		.symbol_rate_max    = 10762000,	/* VSB 8  */
+		.caps = FE_CAN_QAM_64 | FE_CAN_QAM_256 | FE_CAN_8VSB
+	},
+	.init                 = lgdt330x_init,
+	.set_frontend         = lgdt330x_set_parameters,
+	.get_frontend         = lgdt330x_get_frontend,
+	.get_tune_settings    = lgdt330x_get_tune_settings,
+	.read_status          = lgdt3302_read_status,
+	.read_ber             = lgdt330x_read_ber,
+	.read_signal_strength = lgdt330x_read_signal_strength,
+	.read_snr             = lgdt3302_read_snr,
+	.read_ucblocks        = lgdt330x_read_ucblocks,
+	.release              = lgdt330x_release,
+};
+
+static struct dvb_frontend_ops lgdt3303_ops = {
+	.delsys = { SYS_ATSC, SYS_DVBC_ANNEX_B },
+	.info = {
+		.name= "LG Electronics LGDT3303 VSB/QAM Frontend",
+		.frequency_min= 54000000,
+		.frequency_max= 858000000,
+		.frequency_stepsize= 62500,
+		.symbol_rate_min    = 5056941,	/* QAM 64 */
+		.symbol_rate_max    = 10762000,	/* VSB 8  */
+		.caps = FE_CAN_QAM_64 | FE_CAN_QAM_256 | FE_CAN_8VSB
+	},
+	.init                 = lgdt330x_init,
+	.set_frontend         = lgdt330x_set_parameters,
+	.get_frontend         = lgdt330x_get_frontend,
+	.get_tune_settings    = lgdt330x_get_tune_settings,
+	.read_status          = lgdt3303_read_status,
+	.read_ber             = lgdt330x_read_ber,
+	.read_signal_strength = lgdt330x_read_signal_strength,
+	.read_snr             = lgdt3303_read_snr,
+	.read_ucblocks        = lgdt330x_read_ucblocks,
+	.release              = lgdt330x_release,
+};
+
+MODULE_DESCRIPTION("LGDT330X (ATSC 8VSB & ITU-T J.83 AnnexB 64/256 QAM) Demodulator Driver");
+MODULE_AUTHOR("Wilson Michaels");
+MODULE_LICENSE("GPL");
+
+EXPORT_SYMBOL(lgdt330x_attach);
+
+/*
+ * Local variables:
+ * c-basic-offset: 8
+ * End:
+ */