/*
Auvitek AU8522 QAM/8VSB demodulator driver
Copyright (C) 2008 Steven Toth <stoth@linuxtv.org>
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.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/delay.h>
#include "dvb_frontend.h"
#include "au8522.h"
#include "au8522_priv.h"
static int debug;
#define dprintk(arg...)\
do { if (debug)\
printk(arg);\
} while (0)
struct mse2snr_tab {
u16 val;
u16 data;
};
/* VSB SNR lookup table */
static struct mse2snr_tab vsb_mse2snr_tab[] = {
{ 0, 270 },
{ 2, 250 },
{ 3, 240 },
{ 5, 230 },
{ 7, 220 },
{ 9, 210 },
{ 12, 200 },
{ 13, 195 },
{ 15, 190 },
{ 17, 185 },
{ 19, 180 },
{ 21, 175 },
{ 24, 170 },
{ 27, 165 },
{ 31, 160 },
{ 32, 158 },
{ 33, 156 },
{ 36, 152 },
{ 37, 150 },
{ 39, 148 },
{ 40, 146 },
{ 41, 144 },
{ 43, 142 },
{ 44, 140 },
{ 48, 135 },
{ 50, 130 },
{ 43, 142 },
{ 53, 125 },
{ 56, 120 },
{ 256, 115 },
};
/* QAM64 SNR lookup table */
static struct mse2snr_tab qam64_mse2snr_tab[] = {
{ 15, 0 },
{ 16, 290 },
{ 17, 288 },
{ 18, 286 },
{ 19, 284 },
{ 20, 282 },
{ 21, 281 },
{ 22, 279 },
{ 23, 277 },
{ 24, 275 },
{ 25, 273 },
{ 26, 271 },
{ 27, 269 },
{ 28, 268 },
{ 29, 266 },
{ 30, 264 },
{ 31, 262 },
{ 32, 260 },
{ 33, 259 },
{ 34, 258 },
{ 35, 256 },
{ 36, 255 },
{ 37, 254 },
{ 38, 252 },
{ 39, 251 },
{ 40, 250 },
{ 41, 249 },
{ 42, 248 },
{ 43, 246 },
{ 44, 245 },
{ 45, 244 },
{ 46, 242 },
{ 47, 241 },
{ 48, 240 },
{ 50, 239 },
{ 51, 238 },
{ 53, 237 },
{ 54, 236 },
{ 56, 235 },
{ 57, 234 },
{ 59, 233 },
{ 60, 232 },
{ 62, 231 },
{ 63, 230 },
{ 65, 229 },
{ 67, 228 },
{ 68, 227 },
{ 70, 226 },
{ 71, 225 },
{ 73, 224 },
{ 74, 223 },
{ 76, 222 },
{ 78, 221 },
{ 80, 220 },
{ 82, 219 },
{ 85, 218 },
{ 88, 217 },
{ 90, 216 },
{ 92, 215 },
{ 93, 214 },
{ 94, 212 },
{ 95, 211 },
{ 97, 210 },
{ 99, 209 },
{ 101, 208 },
{ 102, 207 },
{ 104, 206 },
{ 107, 205 },
{ 111, 204 },
{ 114, 203 },
{ 118, 202 },
{ 122, 201 },
{ 125, 200 },
{ 128, 199 },
{ 130, 198 },
{ 132, 197 },
{ 256, 190 },
};
/* QAM256 SNR lookup table */
static struct mse2snr_tab qam256_mse2snr_tab[] = {
{ 15, 0 },
{ 16, 400 },
{ 17, 398 },
{ 18, 396 },
{ 19, 394 },
{ 20, 392 },
{ 21, 390 },
{ 22, 388 },
{ 23, 386 },
{ 24, 384 },
{ 25, 382 },
{ 26, 380 },
{ 27, 379 },
{ 28, 378 },
{ 29, 377 },
{ 30, 376 },
{ 31, 375 },
{ 32, 374 },
{ 33, 373 },
{ 34, 372 },
{ 35, 371 },
{ 36, 370 },
{ 37, 362 },
{ 38, 354 },
{ 39, 346 },
{ 40, 338 },
{ 41, 330 },
{ 42, 328 },
{ 43, 326 },
{ 44, 324 },
{ 45, 322 },
{ 46, 320 },
{ 47, 319 },
{ 48, 318 },
{ 49, 317 },
{ 50, 316 },
{ 51, 315 },
{ 52, 314 },
{ 53, 313 },
{ 54, 312 },
{ 55, 311 },
{ 56, 310 },
{ 57, 308 },
{ 58, 306 },
{ 59, 304 },
{ 60, 302 },
{ 61, 300 },
{ 62, 298 },
{ 65, 295 },
{ 68, 294 },
{ 70, 293 },
{ 73, 292 },
{ 76, 291 },
{ 78, 290 },
{ 79, 289 },
{ 81, 288 },
{ 82, 287 },
{ 83, 286 },
{ 84, 285 },
{ 85, 284 },
{ 86, 283 },
{ 88, 282 },
{ 89, 281 },
{ 256, 280 },
};
static int au8522_mse2snr_lookup(struct mse2snr_tab *tab, int sz, int mse,
u16 *snr)
{
int i, ret = -EINVAL;
dprintk("%s()\n", __func__);
for (i = 0; i < sz; i++) {
if (mse < tab[i].val) {
*snr = tab[i].data;
ret = 0;
break;
}
}
dprintk("%s() snr=%d\n", __func__, *snr);
return ret;
}
static int au8522_set_if(struct dvb_frontend *fe, enum au8522_if_freq if_freq)
{
struct au8522_state *state = fe->demodulator_priv;
u8 r0b5, r0b6, r0b7;
char *ifmhz;
switch (if_freq) {
case AU8522_IF_3_25MHZ:
ifmhz = "3.25";
r0b5 = 0x00;
r0b6 = 0x3d;
r0b7 = 0xa0;
break;
case AU8522_IF_4MHZ:
ifmhz = "4.00";
r0b5 = 0x00;
r0b6 = 0x4b;
r0b7 = 0xd9;
break;
case AU8522_IF_6MHZ:
ifmhz = "6.00";
r0b5 = 0xfb;
r0b6 = 0x8e;
r0b7 = 0x39;
break;
default:
dprintk("%s() IF Frequency not supported\n", __func__);
return -EINVAL;
}
dprintk("%s() %s MHz\n", __func__, ifmhz);
au8522_writereg(state, 0x80b5, r0b5);
au8522_writereg(state, 0x80b6, r0b6);
au8522_writereg(state, 0x80b7, r0b7);
return 0;
}
/* VSB Modulation table */
static struct {
u16 reg;
u16 data;
} VSB_mod_tab[] = {
{ 0x8090, 0x84 },
{ 0x4092, 0x11 },
{ 0x2005, 0x00 },
{ 0x8091, 0x80 },
{ 0x80a3, 0x0c },
{ 0x80a4, 0xe8 },
{ 0x8081, 0xc4 },
{ 0x80a5, 0x40 },
{ 0x80a7, 0x40 },
{ 0x80a6, 0x67 },
{ 0x8262, 0x20 },
{ 0x821c, 0x30 },
{ 0x80d8, 0x1a },
{ 0x8227, 0xa0 },
{ 0x8121, 0xff },
{ 0x80a8, 0xf0 },
{ 0x80a9, 0x05 },
{ 0x80aa, 0x77 },
{ 0x80ab, 0xf0 },
{ 0x80ac, 0x05 },
{ 0x80ad, 0x77 },
{ 0x80ae, 0x41 },
{ 0x80af, 0x66 },
{ 0x821b, 0xcc },
{ 0x821d, 0x80 },
{ 0x80a4, 0xe8 },
{ 0x8231, 0x13 },
};
/* QAM64 Modulation table */
static struct {
u16 reg;
u16 data;
} QAM64_mod_tab[] = {
{ 0x00a3, 0x09 },
{ 0x00a4, 0x00 },
{ 0x0081, 0xc4 },
{ 0x00a5, 0x40 },
{ 0x00aa, 0x77 },
{ 0x00ad, 0x77 },
{ 0x00a6, 0x67 },
{ 0x0262, 0x20 },
{ 0x021c, 0x30 },
{ 0x00b8, 0x3e },
{ 0x00b9, 0xf0 },
{ 0x00ba, 0x01 },
{ 0x00bb, 0x18 },
{ 0x00bc, 0x50 },
{ 0x00bd, 0x00 },
{ 0x00be, 0xea },
{ 0x00bf, 0xef },
{ 0x00c0, 0xfc },
{ 0x00c1, 0xbd },
{ 0x00c2, 0x1f },
{ 0x00c3, 0xfc },
{ 0x00c4, 0xdd },
{ 0x00c5, 0xaf },
{ 0x00c6, 0x00 },
{ 0x00c7, 0x38 },
{ 0x00c8, 0x30 },
{ 0x00c9, 0x05 },
{ 0x00ca, 0x4a },
{ 0x00cb, 0xd0 },
{ 0x00cc, 0x01 },
{ 0x00cd, 0xd9 },
{ 0x00ce, 0x6f },
{ 0x00cf, 0xf9 },
{ 0x00d0, 0x70 },
{ 0x00d1, 0xdf },
{ 0x00d2, 0xf7 },
{ 0x00d3, 0xc2 },
{ 0x00d4, 0xdf },
{ 0x00d5, 0x02 },
{ 0x00d6, 0x9a },
{ 0x00d7, 0xd0 },
{ 0x0250, 0x0d },
{ 0x0251, 0xcd },
{ 0x0252, 0xe0 },
{ 0x0253, 0x05 },
{ 0x0254, 0xa7 },
{ 0x0255, 0xff },
{ 0x0256, 0xed },
{ 0x0257, 0x5b },
{ 0x0258, 0xae },
{ 0x0259, 0xe6 },
{ 0x025a, 0x3d },
{ 0x025b, 0x0f },
{ 0x025c, 0x0d },
{ 0x025d, 0xea },
{ 0x025e, 0xf2 },
{ 0x025f, 0x51 },
{ 0x0260, 0xf5 },
{ 0x0261, 0x06 },
{ 0x021a, 0x00 },
{ 0x0546, 0x40 },
{ 0x0210, 0xc7 },
{ 0x0211, 0xaa },
{ 0x0212, 0xab },
{ 0x0213, 0x02 },
{ 0x0502, 0x00 },
{ 0x0121, 0x04 },
{ 0x0122, 0x04 },
{ 0x052e, 0x10 },
{ 0x00a4, 0xca },
{ 0x00a7, 0x40 },
{ 0x0526, 0x01 },
};
/* QAM256 Modulation table */
static struct {
u16 reg;
u16 data;
} QAM256_mod_tab[] = {
{ 0x80a3, 0x09 },
{ 0x80a4, 0x00 },
{ 0x8081, 0xc4 },
{ 0x80a5, 0x40 },
{ 0x80aa, 0x77 },
{ 0x80ad, 0x77 },
{ 0x80a6, 0x67 },
{ 0x8262, 0x20 },
{ 0x821c, 0x30 },
{ 0x80b8, 0x3e },
{ 0x80b9, 0xf0 },
{ 0x80ba, 0x01 },
{ 0x80bb, 0x18 },
{ 0x80bc, 0x50 },
{ 0x80bd, 0x00 },
{ 0x80be, 0xea },
{ 0x80bf, 0xef },
{ 0x80c0, 0xfc },
{ 0x80c1, 0xbd },
{ 0x80c2, 0x1f },
{ 0x80c3, 0xfc },
{ 0x80c4, 0xdd },
{ 0x80c5, 0xaf },
{ 0x80c6, 0x00 },
{ 0x80c7, 0x38 },
{ 0x80c8, 0x30 },
{ 0x80c9, 0x05 },
{ 0x80ca, 0x4a },
{ 0x80cb, 0xd0 },
{ 0x80cc, 0x01 },
{ 0x80cd, 0xd9 },
{ 0x80ce, 0x6f },
{ 0x80cf, 0xf9 },
{ 0x80d0, 0x70 },
{ 0x80d1, 0xdf },
{ 0x80d2, 0xf7 },
{ 0x80d3, 0xc2 },
{ 0x80d4, 0xdf },
{ 0x80d5, 0x02 },
{ 0x80d6, 0x9a },
{ 0x80d7, 0xd0 },
{ 0x8250, 0x0d },
{ 0x8251, 0xcd },
{ 0x8252, 0xe0 },
{ 0x8253, 0x05 },
{ 0x8254, 0xa7 },
{ 0x8255, 0xff },
{ 0x8256, 0xed },
{ 0x8257, 0x5b },
{ 0x8258, 0xae },
{ 0x8259, 0xe6 },
{ 0x825a, 0x3d },
{ 0x825b, 0x0f },
{ 0x825c, 0x0d },
{ 0x825d, 0xea },
{ 0x825e, 0xf2 },
{ 0x825f, 0x51 },
{ 0x8260, 0xf5 },
{ 0x8261, 0x06 },
{ 0x821a, 0x00 },
{ 0x8546, 0x40 },
{ 0x8210, 0x26 },
{ 0x8211, 0xf6 },
{ 0x8212, 0x84 },
{ 0x8213, 0x02 },
{ 0x8502, 0x01 },
{ 0x8121, 0x04 },
{ 0x8122, 0x04 },
{ 0x852e, 0x10 },
{ 0x80a4, 0xca },
{ 0x80a7, 0x40 },
{ 0x8526, 0x01 },
};
static int au8522_enable_modulation(struct dvb_frontend *fe,
fe_modulation_t m)
{
struct au8522_state *state = fe->demodulator_priv;
int i;
dprintk("%s(0x%08x)\n", __func__, m);
switch (m) {
case VSB_8:
dprintk("%s() VSB_8\n", __func__);
for (i = 0; i < ARRAY_SIZE(VSB_mod_tab); i++)
au8522_writereg(state,
VSB_mod_tab[i].reg,
VSB_mod_tab[i].data);
au8522_set_if(fe, state->config->vsb_if);
break;
case QAM_64:
dprintk("%s() QAM 64\n", __func__);
for (i = 0; i < ARRAY_SIZE(QAM64_mod_tab); i++)
au8522_writereg(state,
QAM64_mod_tab[i].reg,
QAM64_mod_tab[i].data);
au8522_set_if(fe, state->config->qam_if);
break;
case QAM_256:
dprintk("%s() QAM 256\n", __func__);
for (i = 0; i < ARRAY_SIZE(QAM256_mod_tab); i++)
au8522_writereg(state,
QAM256_mod_tab[i].reg,
QAM256_mod_tab[i].data);
au8522_set_if(fe, state->config->qam_if);
break;
default:
dprintk("%s() Invalid modulation\n", __func__);
return -EINVAL;
}
state->current_modulation = m;
return 0;
}
/* Talk to the demod, set the FEC, GUARD, QAM settings etc */
static int au8522_set_frontend(struct dvb_frontend *fe)
{
struct dtv_frontend_properties *c = &fe->dtv_property_cache;
struct au8522_state *state = fe->demodulator_priv;
int ret = -EINVAL;
dprintk("%s(frequency=%d)\n", __func__, c->frequency);
if ((state->current_frequency == c->frequency) &&
(state->current_modulation == c->modulation))
return 0;
if (fe->ops.tuner_ops.set_params) {
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1);
ret = fe->ops.tuner_ops.set_params(fe);
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0);
}
if (ret < 0)
return ret;
/* Allow the tuner to settle */
msleep(100);
au8522_enable_modulation(fe, c->modulation);
state->current_frequency = c->frequency;
return 0;
}
static int au8522_read_status(struct dvb_frontend *fe, fe_status_t *status)
{
struct au8522_state *state = fe->demodulator_priv;
u8 reg;
u32 tuner_status = 0;
*status = 0;
if (state->current_modulation == VSB_8) {
dprintk("%s() Checking VSB_8\n", __func__);
reg = au8522_readreg(state, 0x4088);
if ((reg & 0x03) == 0x03)
*status |= FE_HAS_LOCK | FE_HAS_SYNC | FE_HAS_VITERBI;
} else {
dprintk("%s() Checking QAM\n", __func__);
reg = au8522_readreg(state, 0x4541);
if (reg & 0x80)
*status |= FE_HAS_VITERBI;
if (reg & 0x20)
*status |= FE_HAS_LOCK | FE_HAS_SYNC;
}
switch (state->config->status_mode) {
case AU8522_DEMODLOCKING:
dprintk("%s() DEMODLOCKING\n", __func__);
if (*status & FE_HAS_VITERBI)
*status |= FE_HAS_CARRIER | FE_HAS_SIGNAL;
break;
case AU8522_TUNERLOCKING:
/* Get the tuner status */
dprintk("%s() TUNERLOCKING\n", __func__);
if (fe->ops.tuner_ops.get_status) {
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1);
fe->ops.tuner_ops.get_status(fe, &tuner_status);
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0);
}
if (tuner_status)
*status |= FE_HAS_CARRIER | FE_HAS_SIGNAL;
break;
}
state->fe_status = *status;
if (*status & FE_HAS_LOCK)
/* turn on LED, if it isn't on already */
au8522_led_ctrl(state, -1);
else
/* turn off LED */
au8522_led_ctrl(state, 0);
dprintk("%s() status 0x%08x\n", __func__, *status);
return 0;
}
static int au8522_led_status(struct au8522_state *state, const u16 *snr)
{
struct au8522_led_config *led_config = state->config->led_cfg;
int led;
u16 strong;
/* bail out if we can't control an LED */
if (!led_config)
return 0;
if (0 == (state->fe_status & FE_HAS_LOCK))
return au8522_led_ctrl(state, 0);
else if (state->current_modulation == QAM_256)
strong = led_config->qam256_strong;
else if (state->current_modulation == QAM_64)
strong = led_config->qam64_strong;
else /* (state->current_modulation == VSB_8) */
strong = led_config->vsb8_strong;
if (*snr >= strong)
led = 2;
else
led = 1;
if ((state->led_state) &&
(((strong < *snr) ? (*snr - strong) : (strong - *snr)) <= 10))
/* snr didn't change enough to bother
* changing the color of the led */
return 0;
return au8522_led_ctrl(state, led);
}
static int au8522_read_snr(struct dvb_frontend *fe, u16 *snr)
{
struct au8522_state *state = fe->demodulator_priv;
int ret = -EINVAL;
dprintk("%s()\n", __func__);
if (state->current_modulation == QAM_256)
ret = au8522_mse2snr_lookup(qam256_mse2snr_tab,
ARRAY_SIZE(qam256_mse2snr_tab),
au8522_readreg(state, 0x4522),
snr);
else if (state->current_modulation == QAM_64)
ret = au8522_mse2snr_lookup(qam64_mse2snr_tab,
ARRAY_SIZE(qam64_mse2snr_tab),
au8522_readreg(state, 0x4522),
snr);
else /* VSB_8 */
ret = au8522_mse2snr_lookup(vsb_mse2snr_tab,
ARRAY_SIZE(vsb_mse2snr_tab),
au8522_readreg(state, 0x4311),
snr);
if (state->config->led_cfg)
au8522_led_status(state, snr);
return ret;
}
static int au8522_read_signal_strength(struct dvb_frontend *fe,
u16 *signal_strength)
{
/* borrowed from lgdt330x.c
*
* 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%
*/
u16 snr;
u32 tmp;
int ret = au8522_read_snr(fe, &snr);
*signal_strength = 0;
if (0 == ret) {
/* The following calculation method was chosen
* purely for the sake of code re-use from the
* other demod drivers that use this method */
/* Convert from SNR in dB * 10 to 8.24 fixed-point */
tmp = (snr * ((1 << 24) / 10));
/* Convert from 8.24 fixed-point to
* scale the range 0 - 35*2^24 into 0 - 65535*/
if (tmp >= 8960 * 0x10000)
*signal_strength = 0xffff;
else
*signal_strength = tmp / 8960;
}
return ret;
}
static int au8522_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
{
struct au8522_state *state = fe->demodulator_priv;
if (state->current_modulation == VSB_8)
*ucblocks = au8522_readreg(state, 0x4087);
else
*ucblocks = au8522_readreg(state, 0x4543);
return 0;
}
static int au8522_read_ber(struct dvb_frontend *fe, u32 *ber)
{
return au8522_read_ucblocks(fe, ber);
}
static int au8522_get_frontend(struct dvb_frontend *fe)
{
struct dtv_frontend_properties *c = &fe->dtv_property_cache;
struct au8522_state *state = fe->demodulator_priv;
c->frequency = state->current_frequency;
c->modulation = state->current_modulation;
return 0;
}
static int au8522_get_tune_settings(struct dvb_frontend *fe,
struct dvb_frontend_tune_settings *tune)
{
tune->min_delay_ms = 1000;
return 0;
}
static struct dvb_frontend_ops au8522_ops;
static void au8522_release(struct dvb_frontend *fe)
{
struct au8522_state *state = fe->demodulator_priv;
au8522_release_state(state);
}
struct dvb_frontend *au8522_attach(const struct au8522_config *config,
struct i2c_adapter *i2c)
{
struct au8522_state *state = NULL;
int instance;
/* allocate memory for the internal state */
instance = au8522_get_state(&state, i2c, config->demod_address);
switch (instance) {
case 0:
dprintk("%s state allocation failed\n", __func__);
break;
case 1:
/* new demod instance */
dprintk("%s using new instance\n", __func__);
break;
default:
/* existing demod instance */
dprintk("%s using existing instance\n", __func__);
break;
}
/* setup the state */
state->config = config;
state->i2c = i2c;
state->operational_mode = AU8522_DIGITAL_MODE;
/* create dvb_frontend */
memcpy(&state->frontend.ops, &au8522_ops,
sizeof(struct dvb_frontend_ops));
state->frontend.demodulator_priv = state;
state->frontend.ops.analog_ops.i2c_gate_ctrl = au8522_analog_i2c_gate_ctrl;
if (au8522_init(&state->frontend) != 0) {
printk(KERN_ERR "%s: Failed to initialize correctly\n",
__func__);
goto error;
}
/* Note: Leaving the I2C gate open here. */
au8522_i2c_gate_ctrl(&state->frontend, 1);
return &state->frontend;
error:
au8522_release_state(state);
return NULL;
}
EXPORT_SYMBOL(au8522_attach);
static struct dvb_frontend_ops au8522_ops = {
.delsys = { SYS_ATSC, SYS_DVBC_ANNEX_B },
.info = {
.name = "Auvitek AU8522 QAM/8VSB Frontend",
.frequency_min = 54000000,
.frequency_max = 858000000,
.frequency_stepsize = 62500,
.caps = FE_CAN_QAM_64 | FE_CAN_QAM_256 | FE_CAN_8VSB
},
.init = au8522_init,
.sleep = au8522_sleep,
.i2c_gate_ctrl = au8522_i2c_gate_ctrl,
.set_frontend = au8522_set_frontend,
.get_frontend = au8522_get_frontend,
.get_tune_settings = au8522_get_tune_settings,
.read_status = au8522_read_status,
.read_ber = au8522_read_ber,
.read_signal_strength = au8522_read_signal_strength,
.read_snr = au8522_read_snr,
.read_ucblocks = au8522_read_ucblocks,
.release = au8522_release,
};
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Enable verbose debug messages");
MODULE_DESCRIPTION("Auvitek AU8522 QAM-B/ATSC Demodulator driver");
MODULE_AUTHOR("Steven Toth");
MODULE_LICENSE("GPL");