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-rw-r--r--drivers/media/dvb/frontends/lgdt330x.c796
1 files changed, 796 insertions, 0 deletions
diff --git a/drivers/media/dvb/frontends/lgdt330x.c b/drivers/media/dvb/frontends/lgdt330x.c
new file mode 100644
index 0000000..1f1cd7a
--- /dev/null
+++ b/drivers/media/dvb/frontends/lgdt330x.c
@@ -0,0 +1,796 @@
+/*
+ * 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
+ *
+ * TODO:
+ * signal strength always returns 0.
+ *
+ */
+
+#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 "lgdt330x_priv.h"
+#include "lgdt330x.h"
+
+static int debug = 0;
+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;
+ struct dvb_frontend_ops ops;
+
+ /* Configuration settings */
+ const struct lgdt330x_config* config;
+
+ struct dvb_frontend frontend;
+
+ /* Demodulator private data */
+ fe_modulation_t current_modulation;
+
+ /* 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", __FUNCTION__, 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 u8 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", __FUNCTION__, state->config->demod_address, reg, ret);
+ } 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 bandwith */
+ AGC_LOOP_BANDWIDTH0, 0x08,
+ AGC_LOOP_BANDWIDTH1, 0x9a
+ };
+
+ static u8 lgdt3303_init_data[] = {
+ 0x4c, 0x14
+ };
+
+ 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";
+ 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", __FUNCTION__, 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];
+
+ 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;
+ }
+
+ *ucblocks = (buf[0] << 8) | buf[1];
+ return 0;
+}
+
+static int lgdt330x_set_parameters(struct dvb_frontend* fe,
+ struct dvb_frontend_parameters *param)
+{
+ /*
+ * 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;
+ /* 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 */
+ 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", __FUNCTION__);
+
+ /* 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", __FUNCTION__);
+
+ /* 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", __FUNCTION__, param->u.vsb.modulation);
+ return -1;
+ }
+ /*
+ * 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));
+ state->config->set_ts_params(fe, 0);
+ state->current_modulation = param->u.vsb.modulation;
+ }
+
+ /* Change only if we are actually changing the channel */
+ if (state->current_frequency != param->frequency) {
+ /* Tune to the new frequency */
+ state->config->pll_set(fe, param);
+ /* Keep track of the new frequency */
+ state->current_frequency = param->frequency;
+ }
+ lgdt330x_SwReset(state);
+ return 0;
+}
+
+static int lgdt330x_get_frontend(struct dvb_frontend* fe,
+ struct dvb_frontend_parameters* param)
+{
+ struct lgdt330x_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 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", __FUNCTION__, buf[0]);
+ if ((buf[0] & 0x0c) == 0x8){
+ /* Test signal does not exist flag */
+ /* as well as the AGC lock flag. */
+ *status |= FE_HAS_SIGNAL;
+ } else {
+ /* Without a signal all other status bits are meaningless */
+ return 0;
+ }
+
+ /*
+ * 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", __FUNCTION__, 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", __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;
+ 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", __FUNCTION__);
+ }
+
+ 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", __FUNCTION__, 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;
+ } else {
+ /* Without a signal all other status bits are meaningless */
+ return 0;
+ }
+
+ /* Carrier Recovery Lock Status Register */
+ i2c_read_demod_bytes(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
+ 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", __FUNCTION__);
+ }
+ return 0;
+}
+
+static int lgdt330x_read_signal_strength(struct dvb_frontend* fe, u16* strength)
+{
+ /* not directly available. */
+ *strength = 0;
+ 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, 0x080000
+ };
+
+ static u8 buf[5];/* read data buffer */
+ static u32 noise; /* noise value */
+ static u32 snr_db; /* index into SNR_EQ[] */
+ struct lgdt330x_state* state = (struct lgdt330x_state*) fe->demodulator_priv;
+
+ /* read both equalizer and phase tracker noise data */
+ i2c_read_demod_bytes(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 lgdt330x_state* state = (struct lgdt330x_state*) fe->demodulator_priv;
+
+ /* read both equalizer and pase tracker noise data */
+ i2c_read_demod_bytes(state, EQPH_ERR0, buf, sizeof(buf));
+
+ if (state->current_modulation == VSB_8) {
+ /* Phase Tracker Mean-Square Error Register for VSB */
+ noise = ((buf[0] & 7<<3) << 13) | (buf[3] << 8) | buf[4];
+ } else {
+
+ /* Carrier Recovery Mean-Square Error for QAM */
+ i2c_read_demod_bytes(state, 0x1a, buf, 2);
+ noise = ((buf[0] & 3) << 8) | buf[1];
+ }
+
+ /* Small values for noise mean signal is better so invert noise */
+ *snr = ~noise;
+#endif
+
+ dprintk("%s: noise = 0x%05x, snr = %idb\n",__FUNCTION__, noise, *snr);
+
+ return 0;
+}
+
+static int lgdt3303_read_snr(struct dvb_frontend* fe, u16* snr)
+{
+ /* Return the raw noise value */
+ static u8 buf[5];/* read data buffer */
+ static u32 noise; /* noise value */
+ struct lgdt330x_state* state = (struct lgdt330x_state*) fe->demodulator_priv;
+
+ if (state->current_modulation == VSB_8) {
+
+ /* Phase Tracker Mean-Square Error Register for VSB */
+ noise = ((buf[0] & 7) << 16) | (buf[3] << 8) | buf[4];
+ } else {
+
+ /* Carrier Recovery Mean-Square Error for QAM */
+ i2c_read_demod_bytes(state, 0x1a, buf, 2);
+ noise = (buf[0] << 8) | buf[1];
+ }
+
+ /* Small values for noise mean signal is better so invert noise */
+ *snr = ~noise;
+
+ dprintk("%s: noise = 0x%05x, snr = %idb\n",__FUNCTION__, noise, *snr);
+
+ 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 = (struct lgdt330x_state*) kmalloc(sizeof(struct lgdt330x_state), GFP_KERNEL);
+ if (state == NULL)
+ goto error;
+ memset(state,0,sizeof(*state));
+
+ /* Setup the state */
+ state->config = config;
+ state->i2c = i2c;
+ switch (config->demod_chip) {
+ case LGDT3302:
+ memcpy(&state->ops, &lgdt3302_ops, sizeof(struct dvb_frontend_ops));
+ break;
+ case LGDT3303:
+ memcpy(&state->ops, &lgdt3303_ops, sizeof(struct dvb_frontend_ops));
+ break;
+ default:
+ goto error;
+ }
+
+ /* Verify communication with demod chip */
+ if (i2c_read_demod_bytes(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 = 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 = {
+ .info = {
+ .name= "LG Electronics LGDT3303 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 = 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:
+ */
generated by cgit v1.1 at 2024-10-31 22:18:57 +0000