Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1007 insertions, 0 deletions

diff --git a/drivers/media/dvb-frontends/lgdt330x.c b/drivers/media/dvb-frontends/lgdt330x.c
new file mode 100644
index 000000000..cb07869ea
--- /dev/null
+++ b/drivers/media/dvb-frontends/lgdt330x.c
@@ -0,0 +1,1007 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *    Support for LGDT3302 and LGDT3303 - VSB/QAM
+ *
+ *    Copyright (C) 2005 Wilson Michaels <wilsonmichaels@earthlink.net>
+ */
+
+/*
+ *                      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 <media/dvb_frontend.h>
+#include <media/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(state, fmt, arg...) do {				\
+	if (debug)							\
+		dev_printk(KERN_DEBUG, &state->client->dev, fmt, ##arg);\
+} while (0)
+
+struct lgdt330x_state {
+	struct i2c_client *client;
+
+	/* Configuration settings */
+	struct lgdt330x_config config;
+
+	struct dvb_frontend frontend;
+
+	/* Demodulator private data */
+	enum fe_modulation current_modulation;
+	u32 snr;	/* Result of last SNR calculation */
+	u16 ucblocks;
+	unsigned long last_stats_time;
+
+	/* Tuner private data */
+	u32 current_frequency;
+};
+
+static int i2c_write_demod_bytes(struct lgdt330x_state *state,
+				 const u8 *buf, /* data bytes to send */
+				 int len  /* number of bytes to send */)
+{
+	int i;
+	int err;
+
+	for (i = 0; i < len - 1; i += 2) {
+		err = i2c_master_send(state->client, buf, 2);
+		if (err != 2) {
+			dev_warn(&state->client->dev,
+				 "%s: error (addr %02x <- %02x, err = %i)\n",
+				__func__, buf[0], buf[1], err);
+			if (err < 0)
+				return err;
+			else
+				return -EREMOTEIO;
+		}
+		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->client->addr,
+			.flags = 0,
+			.buf = wr,
+			.len = 1
+		}, {
+			.addr = state->client->addr,
+			.flags = I2C_M_RD,
+			.buf = buf,
+			.len = len
+		},
+	};
+	int ret;
+
+	ret = i2c_transfer(state->client->adapter, msg, 2);
+	if (ret != 2) {
+		dev_warn(&state->client->dev,
+			 "%s: addr 0x%02x select 0x%02x error (ret == %i)\n",
+			 __func__, state->client->addr, reg, ret);
+		if (ret >= 0)
+			ret = -EIO;
+	} else {
+		ret = 0;
+	}
+	return ret;
+}
+
+/* Software reset */
+static int lgdt3302_sw_reset(struct lgdt330x_state *state)
+{
+	u8 ret;
+	u8 reset[] = {
+		IRQ_MASK,
+		/*
+		 * bit 6 is active low software reset
+		 * bits 5-0 are 1 to mask interrupts
+		 */
+		0x00
+	};
+
+	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_sw_reset(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_sw_reset(struct lgdt330x_state *state)
+{
+	switch (state->config.demod_chip) {
+	case LGDT3302:
+		return lgdt3302_sw_reset(state);
+	case LGDT3303:
+		return lgdt3303_sw_reset(state);
+	default:
+		return -ENODEV;
+	}
+}
+
+static int lgdt330x_init(struct dvb_frontend *fe)
+{
+	struct lgdt330x_state *state = fe->demodulator_priv;
+	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
+	char  *chip_name;
+	int    err;
+	/*
+	 * Array of byte pairs <address, value>
+	 * to initialize each different chip
+	 */
+	static const u8 lgdt3302_init_data[] = {
+		/* Use 50MHz param 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 const u8 lgdt3303_init_data[] = {
+		0x4c, 0x14
+	};
+	static const u8 flip_1_lgdt3303_init_data[] = {
+		0x4c, 0x14,
+		0x87, 0xf3
+	};
+	static const u8 flip_2_lgdt3303_init_data[] = {
+		0x4c, 0x14,
+		0x87, 0xda
+	};
+
+	/*
+	 * 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.
+	 */
+
+	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";
+		dev_warn(&state->client->dev,
+			 "Only LGDT3302 and LGDT3303 are supported chips.\n");
+		err = -ENODEV;
+	}
+	dprintk(state, "Initialized the %s chip\n", chip_name);
+	if (err < 0)
+		return err;
+
+	p->cnr.len = 1;
+	p->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+	p->block_error.len = 1;
+	p->block_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+	p->block_count.len = 1;
+	p->block_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+	state->last_stats_time = 0;
+
+	return lgdt330x_sw_reset(state);
+}
+
+static int lgdt330x_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
+{
+	struct lgdt330x_state *state = fe->demodulator_priv;
+
+	*ucblocks = state->ucblocks;
+
+	return 0;
+}
+
+static int lgdt330x_set_parameters(struct dvb_frontend *fe)
+{
+	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
+	struct lgdt330x_state *state = fe->demodulator_priv;
+	/*
+	 * Array of byte pairs <address, value>
+	 * to initialize 8VSB for lgdt3303 chip 50 MHz IF
+	 */
+	static const 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 const 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
+	};
+	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(state, "VSB_8 MODE\n");
+
+			/* 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(state, "QAM_64 MODE\n");
+
+			/* 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(state, "QAM_256 MODE\n");
+
+			/* 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:
+			dev_warn(&state->client->dev,
+				 "%s: Modulation type(%d) UNSUPPORTED\n",
+				 __func__, p->modulation);
+			return -1;
+		}
+		if (err < 0)
+			dev_warn(&state->client->dev,
+				 "%s: error blasting bytes to lgdt3303 for modulation type(%d)\n",
+				 __func__, p->modulation);
+
+		/*
+		 * select serial or parallel MPEG hardware 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_sw_reset(state);
+	return 0;
+}
+
+static int lgdt330x_get_frontend(struct dvb_frontend *fe,
+				 struct dtv_frontend_properties *p)
+{
+	struct lgdt330x_state *state = fe->demodulator_priv;
+
+	p->frequency = state->current_frequency;
+	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)
+{
+	struct lgdt330x_state *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:
+		dev_err(&state->client->dev,
+			"%s: Modulation set to unsupported value\n",
+			__func__);
+
+		state->snr = 0;
+
+		return -EREMOTEIO; /* return -EDRIVER_IS_GIBBERED; */
+	}
+
+	state->snr = calculate_snr(noise, c);
+
+	dprintk(state, "noise = 0x%08x, snr = %d.%02d dB\n", noise,
+		state->snr >> 24, (((state->snr >> 8) & 0xffff) * 100) >> 16);
+
+	return 0;
+}
+
+static int lgdt3303_read_snr(struct dvb_frontend *fe)
+{
+	struct lgdt330x_state *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:
+		dev_err(&state->client->dev,
+			"%s: Modulation set to unsupported value\n",
+			__func__);
+		state->snr = 0;
+		return -EREMOTEIO; /* return -EDRIVER_IS_GIBBERED; */
+	}
+
+	state->snr = calculate_snr(noise, c);
+
+	dprintk(state, "noise = 0x%08x, snr = %d.%02d dB\n", noise,
+		state->snr >> 24, (((state->snr >> 8) & 0xffff) * 100) >> 16);
+
+	return 0;
+}
+
+static int lgdt330x_read_snr(struct dvb_frontend *fe, u16 *snr)
+{
+	struct lgdt330x_state *state = fe->demodulator_priv;
+
+	*snr = (state->snr) >> 16; /* Convert from 8.24 fixed-point to 8.8 */
+
+	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 = 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 lgdt3302_read_status(struct dvb_frontend *fe,
+				enum fe_status *status)
+{
+	struct lgdt330x_state *state = fe->demodulator_priv;
+	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
+	u8 buf[3];
+	int err;
+
+	*status = 0; /* Reset status result */
+
+	/* AGC status register */
+	i2c_read_demod_bytes(state, AGC_STATUS, buf, 1);
+	dprintk(state, "AGC_STATUS = 0x%02x\n", 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(state,
+		"TOP_CONTROL = 0x%02x, IRO_MASK = 0x%02x, IRQ_STATUS = 0x%02x\n",
+		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 | FE_HAS_VITERBI;
+
+	/* Carrier Recovery Lock Status Register */
+	i2c_read_demod_bytes(state, CARRIER_LOCK, buf, 1);
+	dprintk(state, "CARRIER_LOCK = 0x%02x\n", 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:
+		dev_warn(&state->client->dev,
+			 "%s: Modulation set to unsupported value\n",
+			 __func__);
+	}
+
+	if (!(*status & FE_HAS_LOCK)) {
+		p->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+		p->block_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+		p->block_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+		return 0;
+	}
+
+	if (state->last_stats_time &&
+	    time_is_after_jiffies(state->last_stats_time))
+		return 0;
+
+	state->last_stats_time = jiffies + msecs_to_jiffies(1000);
+
+	err = lgdt3302_read_snr(fe);
+	if (!err) {
+		p->cnr.stat[0].scale = FE_SCALE_DECIBEL;
+		p->cnr.stat[0].svalue = (((u64)state->snr) * 1000) >> 24;
+	} else {
+		p->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+	}
+
+	err = i2c_read_demod_bytes(state, LGDT3302_PACKET_ERR_COUNTER1,
+					   buf, sizeof(buf));
+	if (!err) {
+		state->ucblocks = (buf[0] << 8) | buf[1];
+
+		dprintk(state, "UCB = 0x%02x\n", state->ucblocks);
+
+		p->block_error.stat[0].uvalue += state->ucblocks;
+		/* FIXME: what's the basis for block count */
+		p->block_count.stat[0].uvalue += 10000;
+
+		p->block_error.stat[0].scale = FE_SCALE_COUNTER;
+		p->block_count.stat[0].scale = FE_SCALE_COUNTER;
+	} else {
+		p->block_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+		p->block_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+	}
+
+	return 0;
+}
+
+static int lgdt3303_read_status(struct dvb_frontend *fe,
+				enum fe_status *status)
+{
+	struct lgdt330x_state *state = fe->demodulator_priv;
+	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
+	u8 buf[3];
+	int err;
+
+	*status = 0; /* Reset status result */
+
+	/* lgdt3303 AGC status register */
+	err = i2c_read_demod_bytes(state, 0x58, buf, 1);
+	if (err < 0)
+		return err;
+
+	dprintk(state, "AGC_STATUS = 0x%02x\n", 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(state, "CARRIER_LOCK = 0x%02x\n", 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);
+		dprintk(state, "QAM LOCK = 0x%02x\n", buf[0]);
+
+		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);
+		dprintk(state, "8-VSB LOCK = 0x%02x\n", buf[0]);
+
+		if ((buf[0] & 0x02) == 0x00)
+			*status |= FE_HAS_SYNC;
+		if ((buf[0] & 0x01) == 0x01)
+			*status |= FE_HAS_VITERBI | FE_HAS_LOCK;
+		break;
+	default:
+		dev_warn(&state->client->dev,
+			 "%s: Modulation set to unsupported value\n",
+			 __func__);
+	}
+
+	if (!(*status & FE_HAS_LOCK)) {
+		p->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+		p->block_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+		p->block_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+		return 0;
+	}
+
+	if (state->last_stats_time &&
+	    time_is_after_jiffies(state->last_stats_time))
+		return 0;
+
+	state->last_stats_time = jiffies + msecs_to_jiffies(1000);
+
+	err = lgdt3303_read_snr(fe);
+	if (!err) {
+		p->cnr.stat[0].scale = FE_SCALE_DECIBEL;
+		p->cnr.stat[0].svalue = (((u64)state->snr) * 1000) >> 24;
+	} else {
+		p->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+	}
+
+	err = i2c_read_demod_bytes(state, LGDT3303_PACKET_ERR_COUNTER1,
+					   buf, sizeof(buf));
+	if (!err) {
+		state->ucblocks = (buf[0] << 8) | buf[1];
+
+		dprintk(state, "UCB = 0x%02x\n", state->ucblocks);
+
+		p->block_error.stat[0].uvalue += state->ucblocks;
+		/* FIXME: what's the basis for block count */
+		p->block_count.stat[0].uvalue += 10000;
+
+		p->block_error.stat[0].scale = FE_SCALE_COUNTER;
+		p->block_count.stat[0].scale = FE_SCALE_COUNTER;
+	} else {
+		p->block_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+		p->block_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+	}
+
+	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 = fe->demodulator_priv;
+	struct i2c_client *client = state->client;
+
+	dev_dbg(&client->dev, "\n");
+
+	i2c_unregister_device(client);
+}
+
+static struct dvb_frontend *lgdt330x_get_dvb_frontend(struct i2c_client *client)
+{
+	struct lgdt330x_state *state = i2c_get_clientdata(client);
+
+	dev_dbg(&client->dev, "\n");
+
+	return &state->frontend;
+}
+
+static const struct dvb_frontend_ops lgdt3302_ops;
+static const struct dvb_frontend_ops lgdt3303_ops;
+
+static int lgdt330x_probe(struct i2c_client *client,
+			  const struct i2c_device_id *id)
+{
+	struct lgdt330x_state *state = NULL;
+	u8 buf[1];
+
+	/* Allocate memory for the internal state */
+	state = kzalloc(sizeof(*state), GFP_KERNEL);
+	if (!state)
+		goto error;
+
+	/* Setup the state */
+	memcpy(&state->config, client->dev.platform_data,
+	       sizeof(state->config));
+	i2c_set_clientdata(client, state);
+	state->client = client;
+
+	/* Create dvb_frontend */
+	switch (state->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;
+
+	/* Setup get frontend callback */
+	state->config.get_dvb_frontend = lgdt330x_get_dvb_frontend;
+
+	/* Verify communication with demod chip */
+	if (i2c_read_demod_bytes(state, 2, buf, 1))
+		goto error;
+
+	state->current_frequency = -1;
+	state->current_modulation = -1;
+
+	dev_info(&state->client->dev,
+		"Demod loaded for LGDT330%s chip\n",
+		state->config.demod_chip == LGDT3302 ? "2" : "3");
+
+	return 0;
+
+error:
+	kfree(state);
+	if (debug)
+		dev_printk(KERN_DEBUG, &client->dev, "Error loading lgdt330x driver\n");
+	return -ENODEV;
+}
+struct dvb_frontend *lgdt330x_attach(const struct lgdt330x_config *_config,
+				     u8 demod_address,
+				     struct i2c_adapter *i2c)
+{
+	struct i2c_client *client;
+	struct i2c_board_info board_info = {};
+	struct lgdt330x_config config = *_config;
+
+	strscpy(board_info.type, "lgdt330x", sizeof(board_info.type));
+	board_info.addr = demod_address;
+	board_info.platform_data = &config;
+	client = i2c_new_client_device(i2c, &board_info);
+	if (!i2c_client_has_driver(client))
+		return NULL;
+
+	return lgdt330x_get_dvb_frontend(client);
+}
+EXPORT_SYMBOL_GPL(lgdt330x_attach);
+
+static const struct dvb_frontend_ops lgdt3302_ops = {
+	.delsys = { SYS_ATSC, SYS_DVBC_ANNEX_B },
+	.info = {
+		.name = "LG Electronics LGDT3302 VSB/QAM Frontend",
+		.frequency_min_hz =  54 * MHz,
+		.frequency_max_hz = 858 * MHz,
+		.frequency_stepsize_hz = 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_signal_strength = lgdt330x_read_signal_strength,
+	.read_snr             = lgdt330x_read_snr,
+	.read_ucblocks        = lgdt330x_read_ucblocks,
+	.release              = lgdt330x_release,
+};
+
+static const struct dvb_frontend_ops lgdt3303_ops = {
+	.delsys = { SYS_ATSC, SYS_DVBC_ANNEX_B },
+	.info = {
+		.name = "LG Electronics LGDT3303 VSB/QAM Frontend",
+		.frequency_min_hz =  54 * MHz,
+		.frequency_max_hz = 858 * MHz,
+		.frequency_stepsize_hz = 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_signal_strength = lgdt330x_read_signal_strength,
+	.read_snr             = lgdt330x_read_snr,
+	.read_ucblocks        = lgdt330x_read_ucblocks,
+	.release              = lgdt330x_release,
+};
+
+static void lgdt330x_remove(struct i2c_client *client)
+{
+	struct lgdt330x_state *state = i2c_get_clientdata(client);
+
+	dev_dbg(&client->dev, "\n");
+
+	kfree(state);
+}
+
+static const struct i2c_device_id lgdt330x_id_table[] = {
+	{"lgdt330x", 0},
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, lgdt330x_id_table);
+
+static struct i2c_driver lgdt330x_driver = {
+	.driver = {
+		.name	= "lgdt330x",
+		.suppress_bind_attrs = true,
+	},
+	.probe		= lgdt330x_probe,
+	.remove		= lgdt330x_remove,
+	.id_table	= lgdt330x_id_table,
+};
+
+module_i2c_driver(lgdt330x_driver);
+
+
+MODULE_DESCRIPTION("LGDT330X (ATSC 8VSB & ITU-T J.83 AnnexB 64/256 QAM) Demodulator Driver");
+MODULE_AUTHOR("Wilson Michaels");
+MODULE_LICENSE("GPL");