[linux-dvb] [PATCH] LGDT3302 Frontend Driver

Michael Krufky mkrufky at m1k.net
Tue Jun 28 03:30:02 CEST 2005


Sorry for the double-email... My previous email was bounced from the 
linux-dvb list because I used the wrong email account.

This driver for the LGDT3302 frontend, used by the DViCO FusionHDTV3 
Gold cx88-based hybrid analog/dvb pci card was written by Mac Michaels, 
and is currently in the video4linux CVS. Please apply this to DVB kernel 
as soon as possible.

Signed-off-by: Mac Michaels <wmichaels1 at earthlink.net>
Signed-off-by: Michael Krufky <mkrufky at m1k.net>

-- 
Michael Krufky

-------------- next part --------------
diff -uprN dvb-kernel.orig/linux/drivers/media/dvb/frontends/Kconfig dvb-kernel/linux/drivers/media/dvb/frontends/Kconfig
--- dvb-kernel.orig/linux/drivers/media/dvb/frontends/Kconfig	2005-06-27 20:08:06.000000000 +0000
+++ dvb-kernel/linux/drivers/media/dvb/frontends/Kconfig	2005-06-27 20:46:05.000000000 +0000
@@ -187,4 +187,11 @@ config DVB_BCM3510
 	  An ATSC 8VSB/16VSB and QAM64/256 tuner module. Say Y when you want to
 	  support this frontend.
 
+config DVB_LGDT3302
+	tristate "LGDT3302 based (DViCO FusionHDTV3 Gold)"
+	depends on DVB_CORE
+	help
+	  An ATSC 8VSB and QAM64/256 tuner module. Say Y when you want
+	  to support this frontend.
+
 endmenu
diff -uprN dvb-kernel.orig/linux/drivers/media/dvb/frontends/Makefile dvb-kernel/linux/drivers/media/dvb/frontends/Makefile
--- dvb-kernel.orig/linux/drivers/media/dvb/frontends/Makefile	2005-06-27 20:08:06.000000000 +0000
+++ dvb-kernel/linux/drivers/media/dvb/frontends/Makefile	2005-06-27 20:43:01.000000000 +0000
@@ -30,3 +30,4 @@ obj-$(CONFIG_DVB_OR51211) += or51211.o
 obj-$(CONFIG_DVB_OR51132) += or51132.o
 obj-$(CONFIG_DVB_BCM3510) += bcm3510.o
 obj-$(CONFIG_DVB_S5H1420) += s5h1420.o
+obj-$(CONFIG_DVB_LGDT3302) += lgdt3302.o
diff -uprN dvb-kernel.orig/linux/drivers/media/dvb/frontends/dvb-pll.c dvb-kernel/linux/drivers/media/dvb/frontends/dvb-pll.c
--- dvb-kernel.orig/linux/drivers/media/dvb/frontends/dvb-pll.c	2005-06-27 20:08:06.000000000 +0000
+++ dvb-kernel/linux/drivers/media/dvb/frontends/dvb-pll.c	2005-06-27 20:37:38.000000000 +0000
@@ -93,6 +93,19 @@ struct dvb_pll_desc dvb_pll_lg_z201 = {
 };
 EXPORT_SYMBOL(dvb_pll_lg_z201);
 
+struct dvb_pll_desc dvb_pll_microtune_4042 = {
+	.name  = "Microtune 4042 FI5",
+	.min   =  57000000,
+	.max   = 858000000,
+	.count = 3,
+	.entries = {
+		{ 162000000, 44000000, 62500, 0x8e, 0xa1 },
+		{ 457000000, 44000000, 62500, 0x8e, 0x91 },
+		{ 999999999, 44000000, 62500, 0x8e, 0x31 },
+	},
+};
+EXPORT_SYMBOL(dvb_pll_microtune_4042);
+
 struct dvb_pll_desc dvb_pll_unknown_1 = {
 	.name  = "unknown 1", /* used by dntv live dvb-t */
 	.min   = 174000000,
diff -uprN dvb-kernel.orig/linux/drivers/media/dvb/frontends/dvb-pll.h dvb-kernel/linux/drivers/media/dvb/frontends/dvb-pll.h
--- dvb-kernel.orig/linux/drivers/media/dvb/frontends/dvb-pll.h	2005-06-27 20:08:06.000000000 +0000
+++ dvb-kernel/linux/drivers/media/dvb/frontends/dvb-pll.h	2005-06-27 20:36:09.000000000 +0000
@@ -24,6 +24,7 @@ extern struct dvb_pll_desc dvb_pll_thoms
 extern struct dvb_pll_desc dvb_pll_thomson_dtt759x;
 extern struct dvb_pll_desc dvb_pll_thomson_dtt7610;
 extern struct dvb_pll_desc dvb_pll_lg_z201;
+extern struct dvb_pll_desc dvb_pll_microtune_4042;
 extern struct dvb_pll_desc dvb_pll_unknown_1;
 
 extern struct dvb_pll_desc dvb_pll_tua6010xs;
diff -uprN dvb-kernel.orig/linux/drivers/media/dvb/frontends/lgdt3302.c dvb-kernel/linux/drivers/media/dvb/frontends/lgdt3302.c
--- dvb-kernel.orig/linux/drivers/media/dvb/frontends/lgdt3302.c	1970-01-01 00:00:00.000000000 +0000
+++ dvb-kernel/linux/drivers/media/dvb/frontends/lgdt3302.c	2005-06-27 20:58:36.000000000 +0000
@@ -0,0 +1,621 @@
+/*
+ * $Id: lgdt3302.c,v 1.6 2005/06/22 06:48:58 mkrufky Exp $
+ *
+ *    Support for LGDT3302 (DViCO FustionHDTV 3 Gold) - VSB/QAM
+ *
+ *    Copyright (C) 2005 Wilson Michaels <wilsonmichaels at earthlink.net>
+ *
+ *    Based on code from  Kirk Lapray <kirk_lapray at bigfoot.com>
+ *                           Copyright (C) 2005
+ *
+ *    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 driver supports DViCO FusionHDTV 3 Gold under Linux.
+ *
+ * TODO:
+ * BER and signal strength always return 0.
+ * 
+ */
+
+#include <linux/version.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <asm/byteorder.h>
+
+#include "dvb_frontend.h"
+#include "dvb-pll.h"
+#include "lgdt3302_priv.h"
+#include "lgdt3302.h"
+
+static int debug = 0;
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug,"Turn on/off lgdt3302 frontend debugging (default:off).");
+#define dprintk(args...) \
+do { \
+if (debug) printk(KERN_DEBUG "lgdt3302: " args); \
+} while (0)
+
+struct lgdt3302_state
+{
+	struct i2c_adapter* i2c;
+	struct dvb_frontend_ops ops;
+	
+	/* Configuration settings */
+	const struct lgdt3302_config* config;
+	
+	struct dvb_frontend frontend;
+	
+	/* Demodulator private data */
+	fe_modulation_t current_modulation;
+	
+	/* Tuner private data */
+	u32 current_frequency;
+};
+
+static int i2c_writebytes (struct lgdt3302_state* state,
+			   u8 addr, /* demod_address or pll_address */
+			   u8 *buf, /* data bytes to send */
+			   int len  /* number of bytes to send */ )
+{
+	if (addr == state->config->pll_address) {
+		struct i2c_msg msg =
+			{ .addr = addr, .flags = 0, .buf = buf,  .len = len };
+		int err;
+		
+		if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1) {
+			printk(KERN_WARNING "lgdt3302: %s error (addr %02x <- %02x, err == %i)\n", __FUNCTION__, addr, buf[0], err);
+			return -EREMOTEIO;
+		}
+	} else {
+		u8 tmp[] = { buf[0], buf[1] };
+		struct i2c_msg msg =
+			{ .addr = addr, .flags = 0, .buf = tmp,  .len = 2 };
+		int err;
+		int i;
+		
+		for (i=1; i<len; i++) {
+			tmp[1] = buf[i];
+			if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1) {
+				printk(KERN_WARNING "lgdt3302: %s error (addr %02x <- %02x, err == %i)\n", __FUNCTION__, addr, buf[0], err);
+				return -EREMOTEIO;
+			}
+			tmp[0]++;
+		}
+	}
+	return 0;
+}
+static int i2c_readbytes (struct lgdt3302_state* state,
+			  u8 addr, /* demod_address or pll_address */
+			  u8 *buf, /* holds data bytes read */
+			  int len  /* number of bytes to read */ )
+{
+	struct i2c_msg msg =
+		{ .addr = addr, .flags = I2C_M_RD, .buf = buf,  .len = len };
+	int err;
+	
+	if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1) {
+		printk(KERN_WARNING "lgdt3302: %s error (addr %02x, err == %i)\n", __FUNCTION__, addr, err);
+		return -EREMOTEIO;
+	}
+	return 0;
+}
+
+/*
+ * This routine writes the register (reg) to the demod bus 
+ * then reads the data returned for (len) bytes.
+ */
+
+static u8 i2c_selectreadbytes (struct lgdt3302_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 "lgdt3302: %s: addr 0x%02x select 0x%02x error (ret == %i)\n", __FUNCTION__, state->config->demod_address, reg, ret);
+	} else {
+		ret = 0;
+	}
+	return ret;
+}
+
+/* Software reset */
+int lgdt3302_SwReset(struct lgdt3302_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_writebytes(state, 
+			     state->config->demod_address,
+			     reset, sizeof(reset));
+	if (ret == 0) {
+		/* spec says reset takes 100 ns why wait */
+		/* mdelay(100);    */ /* keep low for 100mS */
+		reset[1] = 0x7f;      /* force reset high (inactive)
+				       * and unmask interrupts */
+		ret = i2c_writebytes(state,
+				     state->config->demod_address,
+				     reset, sizeof(reset));
+	}
+	/* Spec does not indicate a need for this either */
+	/*mdelay(5); */               /* wait 5 msec before doing more */
+	return ret;
+}
+
+static int lgdt3302_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. */
+	
+	dprintk("%s entered\n", __FUNCTION__);
+	return lgdt3302_SwReset((struct lgdt3302_state*) fe->demodulator_priv);
+}
+
+static int lgdt3302_read_ber(struct dvb_frontend* fe, u32* ber)
+{
+	*ber = 0; /* Dummy out for now */
+	return 0;
+}
+
+static int lgdt3302_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
+{
+	struct lgdt3302_state* state = (struct lgdt3302_state*) fe->demodulator_priv;
+	u8 buf[2];
+	
+	i2c_selectreadbytes(state, PACKET_ERR_COUNTER1, buf, sizeof(buf));
+	
+	*ucblocks = (buf[0] << 8) | buf[1];
+	return 0;
+}
+
+static int lgdt3302_set_parameters(struct dvb_frontend* fe,
+				   struct dvb_frontend_parameters *param)
+{
+	u8 buf[4];
+	struct lgdt3302_state* state = 
+		(struct lgdt3302_state*) fe->demodulator_priv;
+	
+#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,10)
+	
+	/* Use 50MHz parameter values from spec sheet since xtal is 50 */
+	static u8 top_ctrl_cfg[]   = { TOP_CONTROL, 0x03 };
+	static u8 vsb_freq_cfg[]   = { VSB_CARRIER_FREQ0, 0x00, 0x87, 0x8e, 0x01 };
+	static u8 demux_ctrl_cfg[] = { DEMUX_CONTROL, 0xfb };
+	static u8 agc_rf_cfg[]     = { AGC_RF_BANDWIDTH0, 0x40, 0x93, 0x00 };
+	static u8 agc_ctrl_cfg[]   = { AGC_FUNC_CTRL2, 0xc6, 0x40 };
+	static u8 agc_delay_cfg[]  = { AGC_DELAY0, 0x00, 0x00, 0x00 };
+	static u8 agc_loop_cfg[]   = { AGC_LOOP_BANDWIDTH0, 0x08, 0x9a };
+	
+	/* Change only if we are actually changing the modulation */
+	if (state->current_modulation != param->u.vsb.modulation) {
+		switch(param->u.vsb.modulation) {
+		case VSB_8:
+			dprintk("%s: VSB_8 MODE\n", __FUNCTION__);
+			
+			/* Select VSB mode and serial MPEG interface */
+			top_ctrl_cfg[1] = 0x07;
+			break;
+			
+		case QAM_64:
+			dprintk("%s: QAM_64 MODE\n", __FUNCTION__);
+			
+			/* Select QAM_64 mode and serial MPEG interface */
+			top_ctrl_cfg[1] = 0x04;
+			break;
+			
+		case QAM_256:
+			dprintk("%s: QAM_256 MODE\n", __FUNCTION__);
+			
+			/* Select QAM_256 mode and serial MPEG interface */
+			top_ctrl_cfg[1] = 0x05;
+			break;
+		default:
+			printk(KERN_WARNING "lgdt3302: %s: Modulation type(%d) UNSUPPORTED\n", __FUNCTION__, param->u.vsb.modulation);
+			return -1;
+		}
+		/* Initializations common to all modes */
+		
+		/* Select the requested mode */
+		i2c_writebytes(state, state->config->demod_address,
+			       top_ctrl_cfg, sizeof(top_ctrl_cfg));
+		
+		/* Change the value of IFBW[11:0]
+		   of AGC IF/RF loop filter bandwidth register */
+		i2c_writebytes(state, state->config->demod_address,
+			       agc_rf_cfg, sizeof(agc_rf_cfg));
+		
+		/* Change the value of bit 6, 'nINAGCBY' and
+		   'NSSEL[1:0] of ACG function control register 2 */
+		/* Change the value of bit 6 'RFFIX'
+		   of AGC function control register 3 */
+		i2c_writebytes(state, state->config->demod_address,
+			       agc_ctrl_cfg, sizeof(agc_ctrl_cfg));
+		
+		/* Change the TPCLK pin polarity 
+		   data is valid on falling clock */
+		i2c_writebytes(state, state->config->demod_address,
+			       demux_ctrl_cfg, sizeof(demux_ctrl_cfg));
+		
+		if (param->u.vsb.modulation == VSB_8) {
+			/* Initialization for VSB modes only */
+			/* Change the value of NCOCTFV[25:0]of carrier
+			   recovery center frequency register for VSB */
+			i2c_writebytes(state, state->config->demod_address,
+				       vsb_freq_cfg, sizeof(vsb_freq_cfg));
+		} else { 
+			/* Initialization for QAM modes only */
+			/* Set the value of 'INLVTHD' register 0x2a/0x2c
+			   to value from 'IFACC' register 0x39/0x3b -1 */
+			int value;
+			i2c_selectreadbytes(state, AGC_RFIF_ACC0,
+					    &agc_delay_cfg[1], 3);
+			value = ((agc_delay_cfg[1] & 0x0f) << 8) | agc_delay_cfg[3];
+			value = value -1;
+			dprintk("%s IFACC -1 = 0x%03x\n", __FUNCTION__, value);
+			agc_delay_cfg[1] = (value >> 8) & 0x0f;
+			agc_delay_cfg[2] = 0x00;
+			agc_delay_cfg[3] = value & 0xff;
+			i2c_writebytes(state, state->config->demod_address,
+				       agc_delay_cfg, sizeof(agc_delay_cfg));
+			
+			/* Change the value of IAGCBW[15:8]
+			   of inner AGC loop filter bandwith */
+			i2c_writebytes(state, state->config->demod_address,
+				       agc_loop_cfg, sizeof(agc_loop_cfg));
+		}
+		
+		state->config->set_ts_params(fe, 0);
+		lgdt3302_SwReset(state);
+		state->current_modulation = param->u.vsb.modulation;
+	}
+#else
+	printk("lgdt3302: %s: you need a newer kernel for this, sorry\n",__FUNCTION__);
+#endif
+	
+	/* Change only if we are actually changing the channel */
+	if (state->current_frequency != param->frequency) {
+		dvb_pll_configure(state->config->pll_desc, buf,
+				  param->frequency, 0);
+		dprintk("%s: tuner bytes: 0x%02x 0x%02x "
+			"0x%02x 0x%02x\n", __FUNCTION__, buf[0],buf[1],buf[2],buf[3]);
+		i2c_writebytes(state, state->config->pll_address ,buf, 4);
+		
+		/* Check the status of the tuner pll */
+		i2c_readbytes(state, state->config->pll_address, buf, 1);
+		dprintk("%s: tuner status byte = 0x%02x\n", __FUNCTION__, buf[0]);
+		
+		lgdt3302_SwReset(state);
+		
+		/* Update current frequency */
+		state->current_frequency = param->frequency;
+	}
+	return 0;
+}
+
+static int lgdt3302_get_frontend(struct dvb_frontend* fe,
+				 struct dvb_frontend_parameters* param)
+{
+	struct lgdt3302_state *state = fe->demodulator_priv;	
+	param->frequency = state->current_frequency;
+	return 0;
+}
+
+
+static int lgdt3302_read_status(struct dvb_frontend* fe, fe_status_t* status)
+{
+	struct lgdt3302_state* state = (struct lgdt3302_state*) fe->demodulator_priv;
+	u8 buf[3];
+	
+	*status = 0; /* Reset status result */
+	
+	/* Check the status of the tuner pll */
+	i2c_readbytes(state, state->config->pll_address, buf, 1);
+	dprintk("%s: tuner status byte = 0x%02x\n", __FUNCTION__, buf[0]);
+	if ((buf[0] & 0xc0) != 0x40)
+		return 0; /* Tuner PLL not locked or not powered on */
+	
+	/*
+	 * 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_selectreadbytes(state, TOP_CONTROL, buf, sizeof(buf));
+	dprintk("%s: TOP_CONTROL = 0x%02x, IRO_MASK = 0x%02x, IRQ_STATUS = 0x%02x\n", __FUNCTION__, buf[0], buf[1], buf[2]);
+	if ((buf[2] & 0x30) == 0x10)
+		*status |= FE_HAS_SIGNAL;
+	
+	/* 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;
+	}
+	
+#if 0
+	/* Alternative method to check for a signal */
+	/* AGC status register */
+	i2c_selectreadbytes(state, AGC_STATUS, buf, 1);
+	dprintk("%s: AGC_STATUS = 0x%02x\n", __FUNCTION__, buf[0]);
+	if ((buf[0] & 0x0c) == 0x80) /* Test signal does not exist flag */
+		/* Test AGC lock flag */
+		*status |= FE_HAS_SIGNAL;
+	else
+		return 0;
+	
+	/* Carrier Recovery Lock Status Register */
+	i2c_selectreadbytes(state, CARRIER_LOCK, buf, 1);
+	dprintk("%s: CARRIER_LOCK = 0x%02x\n", __FUNCTION__, buf[0]);
+	switch (state->current_modulation) {
+	case QAM_256:
+	case QAM_64:
+		/* Need to undestand why there are 3 lock levels here */
+		if ((buf[0] & 0x07) == 0x07)
+			*status |= FE_HAS_CARRIER;
+		else
+			return 0;
+		break;
+#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,10)
+	case VSB_8:
+		if ((buf[0] & 0x80) == 0x80)
+			*status |= FE_HAS_CARRIER;
+		else
+			return 0;
+		break;
+#endif
+	default:
+		printk("KERN_WARNING lgdt3302: %s: Modulation set to unsupported value\n", __FUNCTION__);
+	}
+#endif
+	
+	return 0;
+}
+
+static int lgdt3302_read_signal_strength(struct dvb_frontend* fe, u16* strength)
+{
+	/* not directly available. */
+	return 0;
+}
+
+static int lgdt3302_read_snr(struct dvb_frontend* fe, u16* snr)
+{
+#ifdef SNR_IN_DB
+	/*
+	 * Spec sheet shows formula for SNR_EQ = 10 log10(25 * 24**2 / noise)
+	 * and SNR_PH = 10 log10(25 * 32**2 / noise) for equalizer and phase tracker
+	 * respectively. The following tables are built on these formulas.
+	 * The usual definition is SNR = 20 log10(signal/noise)
+	 * If the specification is wrong the value retuned is 1/2 the actual SNR in db.
+	 *
+	 * This table is a an ordered list of noise values computed by the
+	 * formula from the spec sheet such that the index into the table
+	 * starting at 43 or 45 is the SNR value in db. There are duplicate noise
+	 * value entries at the beginning because the SNR varies more than
+	 * 1 db for a change of 1 digit in noise at very small values of noise.
+	 * 
+	 * Examples from SNR_EQ table:
+	 * noise SNR
+	 *   0    43  
+	 *   1    42  
+	 *   2    39  
+	 *   3    37
+	 *   4    36  
+	 *   5    35  
+	 *   6    34
+	 *   7    33  
+	 *   8    33  
+	 *   9    32
+	 *   10   32
+	 *   11   31
+	 *   12   31
+	 *   13   30
+	 */
+	
+	
+	static const u32 SNR_EQ[] =
+		{ 1,     2,      2,      2, 3,      3,      4,     4,     5,     7,
+		  9,     11,     13,     17, 21,     26,     33,    41,    52,    65,
+		  81,    102,    129,    162, 204,    257,    323,   406,   511,   644,
+		  810,   1020,   1284,   1616, 2035,   2561,   3224,  4059,  5110,  6433,
+		  8098,  10195,  12835,  16158, 20341,  25608,  32238, 40585, 51094, 64323,
+		  80978, 101945, 128341, 161571, 203406, 256073, 0x40000
+		};
+	
+	static const u32 SNR_PH[] = 
+		{ 1,     2,      2,      2,      3,      3,     4,     5,     6,     8,
+		  10,    12,     15,     19,     23,     29, 37,    46,    58,    73,
+		  91,    115,    144,    182,    229,    288, 362,   456,   574,   722,
+		  909,   1144,   1440,   1813,   2282,   2873, 3617,  4553,  5732,  7216,
+		  9084,  11436,  14396,  18124,  22817,  28724,  36161, 45524, 57312, 72151,
+		  90833, 114351, 143960, 181235, 228161, 0x040000
+		}; 
+
+	static u8 buf[5];/* read data buffer */
+	static u32 noise;   /* noise value */
+	static u32 snr_db;  /* index into SNR_EQ[] */
+	struct lgdt3302_state* state = (struct lgdt3302_state*) fe->demodulator_priv;
+	
+	/* read both equalizer and pase tracker noise data */ 
+	i2c_selectreadbytes(state, EQPH_ERR0, buf, sizeof(buf));
+	
+	if (state->current_modulation == VSB_8) {
+		/* Equalizer Mean-Square Error Register for VSB */
+		noise = ((buf[0] & 7) << 16) | (buf[1] << 8) | buf[2];
+		
+		/* 
+		 * Look up noise value in table. 
+		 * A better search algorithm could be used...
+		 * watch out there are duplicate entries.
+		 */
+		for (snr_db = 0; snr_db < sizeof(SNR_EQ); snr_db++) {
+			if (noise < SNR_EQ[snr_db]) {
+				*snr = 43 - snr_db;
+				break;
+			}
+		}
+	} else {
+		/* Phase Tracker Mean-Square Error Register for QAM */
+		noise = ((buf[0] & 7<<3) << 13) | (buf[3] << 8) | buf[4];
+		
+		/* Look up noise value in table. */
+		for (snr_db = 0; snr_db < sizeof(SNR_PH); snr_db++) {
+			if (noise < SNR_PH[snr_db]) {
+				*snr = 45 - snr_db;
+				break;
+			}
+		}
+	}
+#else
+	/* Return the raw noise value */
+	static u8 buf[5];/* read data buffer */
+	static u32 noise;   /* noise value */
+	struct lgdt3302_state* state = (struct lgdt3302_state*) fe->demodulator_priv;
+	
+	/* read both equalizer and pase tracker noise data */
+	i2c_selectreadbytes(state, EQPH_ERR0, buf, sizeof(buf));
+	
+	if (state->current_modulation == VSB_8) {
+		/* Equalizer Mean-Square Error Register for VSB */
+		noise = ((buf[0] & 7) << 16) | (buf[1] << 8) | buf[2];
+	} else {
+		/* Phase Tracker Mean-Square Error Register for QAM */
+		noise = ((buf[0] & 7<<3) << 13) | (buf[3] << 8) | buf[4];
+	}
+	
+	/* Small values for noise mean signal is better so invert noise */
+	/* Noise is 19 bit value so discard 3 LSB*/
+	*snr = ~noise>>3;
+#endif
+	
+	dprintk("%s: noise = 0x%05x, snr = %idb\n",__FUNCTION__, noise, *snr);
+	
+	return 0;
+}
+
+static int lgdt3302_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 lgdt3302_release(struct dvb_frontend* fe)
+{
+	struct lgdt3302_state* state = (struct lgdt3302_state*) fe->demodulator_priv;
+	kfree(state);
+}
+
+static struct dvb_frontend_ops lgdt3302_ops;
+
+struct dvb_frontend* lgdt3302_attach(const struct lgdt3302_config* config,
+				     struct i2c_adapter* i2c)
+{
+	struct lgdt3302_state* state = NULL;
+	u8 buf[1];
+	
+	/* Allocate memory for the internal state */
+	state = (struct lgdt3302_state*) kmalloc(sizeof(struct lgdt3302_state), GFP_KERNEL);
+	if (state == NULL)
+		goto error;
+	memset(state,0,sizeof(*state));
+	
+	/* Setup the state */
+	state->config = config;
+	state->i2c = i2c;
+	memcpy(&state->ops, &lgdt3302_ops, sizeof(struct dvb_frontend_ops));
+	/* Verify communication with demod chip */
+	if (i2c_selectreadbytes(state, 2, buf, 1))
+		goto error;
+	
+	state->current_frequency = -1;
+	state->current_modulation = -1;
+	
+	/* Create dvb_frontend */
+	state->frontend.ops = &state->ops;
+	state->frontend.demodulator_priv = state;
+	return &state->frontend;
+	
+ error:
+	if (state)
+		kfree(state);
+	dprintk("%s: ERROR\n",__FUNCTION__);
+	return NULL;
+}
+
+static struct dvb_frontend_ops lgdt3302_ops = {
+	.info = {
+		.name= "LG Electronics LGDT3302 VSB/QAM Frontend",
+		.type = FE_ATSC,
+		.frequency_min= 54000000,
+		.frequency_max= 858000000,
+		.frequency_stepsize= 62500,
+		/* Symbol rate is for all VSB modes need to check QAM */
+		.symbol_rate_min    = 10762000,
+		.symbol_rate_max    = 10762000,
+		.caps = FE_CAN_QAM_64 | FE_CAN_QAM_256 | FE_CAN_8VSB
+	},
+	.init                 = lgdt3302_init,
+	.set_frontend         = lgdt3302_set_parameters,
+	.get_frontend         = lgdt3302_get_frontend,
+	.get_tune_settings    = lgdt3302_get_tune_settings,
+	.read_status          = lgdt3302_read_status,
+	.read_ber             = lgdt3302_read_ber,
+	.read_signal_strength = lgdt3302_read_signal_strength,
+	.read_snr             = lgdt3302_read_snr,
+	.read_ucblocks        = lgdt3302_read_ucblocks,
+	.release              = lgdt3302_release,
+};
+
+MODULE_DESCRIPTION("LGDT3302 [DViCO FusionHDTV 3 Gold] (ATSC 8VSB & ITU-T J.83 AnnexB 64/256 QAM) Demodulator Driver");
+MODULE_AUTHOR("Wilson Michaels");
+MODULE_LICENSE("GPL");
+
+EXPORT_SYMBOL(lgdt3302_attach);
+
+/*
+ * Local variables:
+ * c-basic-offset: 8
+ * compile-command: "make DVB=1"
+ * End:
+ */
diff -uprN dvb-kernel.orig/linux/drivers/media/dvb/frontends/lgdt3302.h dvb-kernel/linux/drivers/media/dvb/frontends/lgdt3302.h
--- dvb-kernel.orig/linux/drivers/media/dvb/frontends/lgdt3302.h	1970-01-01 00:00:00.000000000 +0000
+++ dvb-kernel/linux/drivers/media/dvb/frontends/lgdt3302.h	2005-06-27 20:38:48.000000000 +0000
@@ -0,0 +1,49 @@
+/*
+ * $Id: lgdt3302.h,v 1.3 2005/06/22 06:48:58 mkrufky Exp $
+ *
+ *    Support for LGDT3302 (DViCO FustionHDTV 3 Gold) - VSB/QAM
+ *
+ *    Copyright (C) 2005 Wilson Michaels <wilsonmichaels at 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.
+ *
+ */
+
+#ifndef LGDT3302_H
+#define LGDT3302_H
+
+#include <linux/dvb/frontend.h>
+
+struct lgdt3302_config
+{
+	/* The demodulator's i2c address */
+	u8 demod_address;
+	u8 pll_address;
+	struct dvb_pll_desc *pll_desc;
+	
+	/* Need to set device param for start_dma */
+	int (*set_ts_params)(struct dvb_frontend* fe, int is_punctured);
+};
+
+extern struct dvb_frontend* lgdt3302_attach(const struct lgdt3302_config* config,
+					    struct i2c_adapter* i2c);
+
+#endif /* LGDT3302_H */
+
+/*
+ * Local variables:
+ * c-basic-offset: 8
+ * End:
+ */
diff -uprN dvb-kernel.orig/linux/drivers/media/dvb/frontends/lgdt3302_priv.h dvb-kernel/linux/drivers/media/dvb/frontends/lgdt3302_priv.h
--- dvb-kernel.orig/linux/drivers/media/dvb/frontends/lgdt3302_priv.h	1970-01-01 00:00:00.000000000 +0000
+++ dvb-kernel/linux/drivers/media/dvb/frontends/lgdt3302_priv.h	2005-06-27 20:38:48.000000000 +0000
@@ -0,0 +1,72 @@
+/*
+ * $Id: lgdt3302_priv.h,v 1.3 2005/06/22 06:48:58 mkrufky Exp $
+ *
+ *    Support for LGDT3302 (DViCO FustionHDTV 3 Gold) - VSB/QAM
+ *
+ *    Copyright (C) 2005 Wilson Michaels <wilsonmichaels at 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.
+ *
+ */
+
+#ifndef _LGDT3302_PRIV_
+#define _LGDT3302_PRIV_
+
+/* i2c control register addresses */
+enum I2C_REG {
+	TOP_CONTROL= 0x00,
+	IRQ_MASK= 0x01,
+	IRQ_STATUS= 0x02,
+	VSB_CARRIER_FREQ0= 0x16,
+	VSB_CARRIER_FREQ1= 0x17,
+	VSB_CARRIER_FREQ2= 0x18,
+	VSB_CARRIER_FREQ3= 0x19,
+	CARRIER_MSEQAM1= 0x1a,
+	CARRIER_MSEQAM2= 0x1b,
+	CARRIER_LOCK= 0x1c,
+	TIMING_RECOVERY= 0x1d,
+	AGC_DELAY0= 0x2a,
+	AGC_DELAY1= 0x2b,
+	AGC_DELAY2= 0x2c,
+	AGC_RF_BANDWIDTH0= 0x2d,
+	AGC_RF_BANDWIDTH1= 0x2e,
+	AGC_RF_BANDWIDTH2= 0x2f,
+	AGC_LOOP_BANDWIDTH0= 0x30,
+	AGC_LOOP_BANDWIDTH1= 0x31,
+	AGC_FUNC_CTRL1= 0x32,
+	AGC_FUNC_CTRL2= 0x33,
+	AGC_FUNC_CTRL3= 0x34,
+	AGC_RFIF_ACC0= 0x39, 
+	AGC_RFIF_ACC1= 0x3a,    
+	AGC_RFIF_ACC2= 0x3b,     
+	AGC_STATUS= 0x3f,
+	SYNC_STATUS_VSB= 0x43,
+	EQPH_ERR0= 0x47,
+	EQ_ERR1= 0x48,
+	EQ_ERR2= 0x49,
+	PH_ERR1= 0x4a,
+	PH_ERR2= 0x4b,
+	DEMUX_CONTROL= 0x66,
+	PACKET_ERR_COUNTER1= 0x6a,
+	PACKET_ERR_COUNTER2= 0x6b,
+};
+
+#endif /* _LGDT3302_PRIV_ */
+
+/*
+ * Local variables:
+ * c-basic-offset: 8
+ * End:
+ */


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