--- /dev/null
+/*
+ * 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);
Code Review / kvmfornfv.git / blobdiff