drivers/media/dvb/frontends/tda8083.c

   1 /*
   2     Driver for Philips TDA8083 based QPSK Demodulator
   3
   4     Copyright (C) 2001 Convergence Integrated Media GmbH
   5
   6     written by Ralph Metzler <ralph@convergence.de>
   7
   8     adoption to the new DVB frontend API and diagnostic ioctl's
   9     by Holger Waechtler <holger@convergence.de>
  10
  11     This program is free software; you can redistribute it and/or modify
  12     it under the terms of the GNU General Public License as published by
  13     the Free Software Foundation; either version 2 of the License, or
  14     (at your option) any later version.
  15
  16     This program is distributed in the hope that it will be useful,
  17     but WITHOUT ANY WARRANTY; without even the implied warranty of
  18     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19     GNU General Public License for more details.
  20
  21     You should have received a copy of the GNU General Public License
  22     along with this program; if not, write to the Free Software
  23     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24
  25 */
  26
  27 #include <linux/init.h>
  28 #include <linux/kernel.h>
  29 #include <linux/module.h>
  30 #include <linux/string.h>
  31 #include <linux/slab.h>
  32 #include <linux/jiffies.h>
  33 #include "dvb_frontend.h"
  34 #include "tda8083.h"
  35
  36
  37 struct tda8083_state {
  38         struct i2c_adapter* i2c;
  39         /* configuration settings */
  40         const struct tda8083_config* config;
  41         struct dvb_frontend frontend;
  42 };
  43
  44 static int debug;
  45 #define dprintk(args...) \
  46         do { \
  47                 if (debug) printk(KERN_DEBUG "tda8083: " args); \
  48         } while (0)
  49
  50
  51 static u8 tda8083_init_tab [] = {
  52         0x04, 0x00, 0x4a, 0x79, 0x04, 0x00, 0xff, 0xea,
  53         0x48, 0x42, 0x79, 0x60, 0x70, 0x52, 0x9a, 0x10,
  54         0x0e, 0x10, 0xf2, 0xa7, 0x93, 0x0b, 0x05, 0xc8,
  55         0x9d, 0x00, 0x42, 0x80, 0x00, 0x60, 0x40, 0x00,
  56         0x00, 0x75, 0x00, 0xe0, 0x00, 0x00, 0x00, 0x00,
  57         0x00, 0x00, 0x00, 0x00
  58 };
  59
  60
  61 static int tda8083_writereg (struct tda8083_state* state, u8 reg, u8 data)
  62 {
  63         int ret;
  64         u8 buf [] = { reg, data };
  65         struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 2 };
  66
  67         ret = i2c_transfer(state->i2c, &msg, 1);
  68
  69         if (ret != 1)
  70                 dprintk ("%s: writereg error (reg %02x, ret == %i)\n",
  71                         __func__, reg, ret);
  72
  73         return (ret != 1) ? -1 : 0;
  74 }
  75
  76 static int tda8083_readregs (struct tda8083_state* state, u8 reg1, u8 *b, u8 len)
  77 {
  78         int ret;
  79         struct i2c_msg msg [] = { { .addr = state->config->demod_address, .flags = 0, .buf = &reg1, .len = 1 },
  80                            { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b, .len = len } };
  81
  82         ret = i2c_transfer(state->i2c, msg, 2);
  83
  84         if (ret != 2)
  85                 dprintk ("%s: readreg error (reg %02x, ret == %i)\n",
  86                         __func__, reg1, ret);
  87
  88         return ret == 2 ? 0 : -1;
  89 }
  90
  91 static inline u8 tda8083_readreg (struct tda8083_state* state, u8 reg)
  92 {
  93         u8 val;
  94
  95         tda8083_readregs (state, reg, &val, 1);
  96
  97         return val;
  98 }
  99
 100 static int tda8083_set_inversion (struct tda8083_state* state, fe_spectral_inversion_t inversion)
 101 {
 102         /*  XXX FIXME: implement other modes than FEC_AUTO */
 103         if (inversion == INVERSION_AUTO)
 104                 return 0;
 105
 106         return -EINVAL;
 107 }
 108
 109 static int tda8083_set_fec (struct tda8083_state* state, fe_code_rate_t fec)
 110 {
 111         if (fec == FEC_AUTO)
 112                 return tda8083_writereg (state, 0x07, 0xff);
 113
 114         if (fec >= FEC_1_2 && fec <= FEC_8_9)
 115                 return tda8083_writereg (state, 0x07, 1 << (FEC_8_9 - fec));
 116
 117         return -EINVAL;
 118 }
 119
 120 static fe_code_rate_t tda8083_get_fec (struct tda8083_state* state)
 121 {
 122         u8 index;
 123         static fe_code_rate_t fec_tab [] = { FEC_8_9, FEC_1_2, FEC_2_3, FEC_3_4,
 124                                        FEC_4_5, FEC_5_6, FEC_6_7, FEC_7_8 };
 125
 126         index = tda8083_readreg(state, 0x0e) & 0x07;
 127
 128         return fec_tab [index];
 129 }
 130
 131 static int tda8083_set_symbolrate (struct tda8083_state* state, u32 srate)
 132 {
 133         u32 ratio;
 134         u32 tmp;
 135         u8 filter;
 136
 137         if (srate > 32000000)
 138                 srate = 32000000;
 139         if (srate < 500000)
 140                 srate = 500000;
 141
 142         filter = 0;
 143         if (srate < 24000000)
 144                 filter = 2;
 145         if (srate < 16000000)
 146                 filter = 3;
 147
 148         tmp = 31250 << 16;
 149         ratio = tmp / srate;
 150
 151         tmp = (tmp % srate) << 8;
 152         ratio = (ratio << 8) + tmp / srate;
 153
 154         tmp = (tmp % srate) << 8;
 155         ratio = (ratio << 8) + tmp / srate;
 156
 157         dprintk("tda8083: ratio == %08x\n", (unsigned int) ratio);
 158
 159         tda8083_writereg (state, 0x05, filter);
 160         tda8083_writereg (state, 0x02, (ratio >> 16) & 0xff);
 161         tda8083_writereg (state, 0x03, (ratio >>  8) & 0xff);
 162         tda8083_writereg (state, 0x04, (ratio      ) & 0xff);
 163
 164         tda8083_writereg (state, 0x00, 0x3c);
 165         tda8083_writereg (state, 0x00, 0x04);
 166
 167         return 1;
 168 }
 169
 170 static void tda8083_wait_diseqc_fifo (struct tda8083_state* state, int timeout)
 171 {
 172         unsigned long start = jiffies;
 173
 174         while (jiffies - start < timeout &&
 175                !(tda8083_readreg(state, 0x02) & 0x80))
 176         {
 177                 msleep(50);
 178         };
 179 }
 180
 181 static int tda8083_set_tone (struct tda8083_state* state, fe_sec_tone_mode_t tone)
 182 {
 183         tda8083_writereg (state, 0x26, 0xf1);
 184
 185         switch (tone) {
 186         case SEC_TONE_OFF:
 187                 return tda8083_writereg (state, 0x29, 0x00);
 188         case SEC_TONE_ON:
 189                 return tda8083_writereg (state, 0x29, 0x80);
 190         default:
 191                 return -EINVAL;
 192         };
 193 }
 194
 195 static int tda8083_set_voltage (struct tda8083_state* state, fe_sec_voltage_t voltage)
 196 {
 197         switch (voltage) {
 198         case SEC_VOLTAGE_13:
 199                 return tda8083_writereg (state, 0x20, 0x00);
 200         case SEC_VOLTAGE_18:
 201                 return tda8083_writereg (state, 0x20, 0x11);
 202         default:
 203                 return -EINVAL;
 204         };
 205 }
 206
 207 static int tda8083_send_diseqc_burst (struct tda8083_state* state, fe_sec_mini_cmd_t burst)
 208 {
 209         switch (burst) {
 210         case SEC_MINI_A:
 211                 tda8083_writereg (state, 0x29, (5 << 2));  /* send burst A */
 212                 break;
 213         case SEC_MINI_B:
 214                 tda8083_writereg (state, 0x29, (7 << 2));  /* send B */
 215                 break;
 216         default:
 217                 return -EINVAL;
 218         };
 219
 220         tda8083_wait_diseqc_fifo (state, 100);
 221
 222         return 0;
 223 }
 224
 225 static int tda8083_send_diseqc_msg (struct dvb_frontend* fe,
 226                                     struct dvb_diseqc_master_cmd *m)
 227 {
 228         struct tda8083_state* state = fe->demodulator_priv;
 229         int i;
 230
 231         tda8083_writereg (state, 0x29, (m->msg_len - 3) | (1 << 2)); /* enable */
 232
 233         for (i=0; i<m->msg_len; i++)
 234                 tda8083_writereg (state, 0x23 + i, m->msg[i]);
 235
 236         tda8083_writereg (state, 0x29, (m->msg_len - 3) | (3 << 2)); /* send!! */
 237
 238         tda8083_wait_diseqc_fifo (state, 100);
 239
 240         return 0;
 241 }
 242
 243 static int tda8083_read_status(struct dvb_frontend* fe, fe_status_t* status)
 244 {
 245         struct tda8083_state* state = fe->demodulator_priv;
 246
 247         u8 signal = ~tda8083_readreg (state, 0x01);
 248         u8 sync = tda8083_readreg (state, 0x02);
 249
 250         *status = 0;
 251
 252         if (signal > 10)
 253                 *status |= FE_HAS_SIGNAL;
 254
 255         if (sync & 0x01)
 256                 *status |= FE_HAS_CARRIER;
 257
 258         if (sync & 0x02)
 259                 *status |= FE_HAS_VITERBI;
 260
 261         if (sync & 0x10)
 262                 *status |= FE_HAS_SYNC;
 263
 264         if (sync & 0x20) /* frontend can not lock */
 265                 *status |= FE_TIMEDOUT;
 266
 267         if ((sync & 0x1f) == 0x1f)
 268                 *status |= FE_HAS_LOCK;
 269
 270         return 0;
 271 }
 272
 273 static int tda8083_read_ber(struct dvb_frontend* fe, u32* ber)
 274 {
 275         struct tda8083_state* state = fe->demodulator_priv;
 276         int ret;
 277         u8 buf[3];
 278
 279         if ((ret = tda8083_readregs(state, 0x0b, buf, sizeof(buf))))
 280                 return ret;
 281
 282         *ber = ((buf[0] & 0x1f) << 16) | (buf[1] << 8) | buf[2];
 283
 284         return 0;
 285 }
 286
 287 static int tda8083_read_signal_strength(struct dvb_frontend* fe, u16* strength)
 288 {
 289         struct tda8083_state* state = fe->demodulator_priv;
 290
 291         u8 signal = ~tda8083_readreg (state, 0x01);
 292         *strength = (signal << 8) | signal;
 293
 294         return 0;
 295 }
 296
 297 static int tda8083_read_snr(struct dvb_frontend* fe, u16* snr)
 298 {
 299         struct tda8083_state* state = fe->demodulator_priv;
 300
 301         u8 _snr = tda8083_readreg (state, 0x08);
 302         *snr = (_snr << 8) | _snr;
 303
 304         return 0;
 305 }
 306
 307 static int tda8083_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
 308 {
 309         struct tda8083_state* state = fe->demodulator_priv;
 310
 311         *ucblocks = tda8083_readreg(state, 0x0f);
 312         if (*ucblocks == 0xff)
 313                 *ucblocks = 0xffffffff;
 314
 315         return 0;
 316 }
 317
 318 static int tda8083_set_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
 319 {
 320         struct tda8083_state* state = fe->demodulator_priv;
 321
 322         if (fe->ops.tuner_ops.set_params) {
 323                 fe->ops.tuner_ops.set_params(fe, p);
 324                 if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
 325         }
 326
 327         tda8083_set_inversion (state, p->inversion);
 328         tda8083_set_fec (state, p->u.qpsk.fec_inner);
 329         tda8083_set_symbolrate (state, p->u.qpsk.symbol_rate);
 330
 331         tda8083_writereg (state, 0x00, 0x3c);
 332         tda8083_writereg (state, 0x00, 0x04);
 333
 334         return 0;
 335 }
 336
 337 static int tda8083_get_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
 338 {
 339         struct tda8083_state* state = fe->demodulator_priv;
 340
 341         /*  FIXME: get symbolrate & frequency offset...*/
 342         /*p->frequency = ???;*/
 343         p->inversion = (tda8083_readreg (state, 0x0e) & 0x80) ?
 344                         INVERSION_ON : INVERSION_OFF;
 345         p->u.qpsk.fec_inner = tda8083_get_fec (state);
 346         /*p->u.qpsk.symbol_rate = tda8083_get_symbolrate (state);*/
 347
 348         return 0;
 349 }
 350
 351 static int tda8083_sleep(struct dvb_frontend* fe)
 352 {
 353         struct tda8083_state* state = fe->demodulator_priv;
 354
 355         tda8083_writereg (state, 0x00, 0x02);
 356         return 0;
 357 }
 358
 359 static int tda8083_init(struct dvb_frontend* fe)
 360 {
 361         struct tda8083_state* state = fe->demodulator_priv;
 362         int i;
 363
 364         for (i=0; i<44; i++)
 365                 tda8083_writereg (state, i, tda8083_init_tab[i]);
 366
 367         tda8083_writereg (state, 0x00, 0x3c);
 368         tda8083_writereg (state, 0x00, 0x04);
 369
 370         return 0;
 371 }
 372
 373 static int tda8083_diseqc_send_burst(struct dvb_frontend* fe, fe_sec_mini_cmd_t burst)
 374 {
 375         struct tda8083_state* state = fe->demodulator_priv;
 376
 377         tda8083_send_diseqc_burst (state, burst);
 378         tda8083_writereg (state, 0x00, 0x3c);
 379         tda8083_writereg (state, 0x00, 0x04);
 380
 381         return 0;
 382 }
 383
 384 static int tda8083_diseqc_set_tone(struct dvb_frontend* fe, fe_sec_tone_mode_t tone)
 385 {
 386         struct tda8083_state* state = fe->demodulator_priv;
 387
 388         tda8083_set_tone (state, tone);
 389         tda8083_writereg (state, 0x00, 0x3c);
 390         tda8083_writereg (state, 0x00, 0x04);
 391
 392         return 0;
 393 }
 394
 395 static int tda8083_diseqc_set_voltage(struct dvb_frontend* fe, fe_sec_voltage_t voltage)
 396 {
 397         struct tda8083_state* state = fe->demodulator_priv;
 398
 399         tda8083_set_voltage (state, voltage);
 400         tda8083_writereg (state, 0x00, 0x3c);
 401         tda8083_writereg (state, 0x00, 0x04);
 402
 403         return 0;
 404 }
 405
 406 static void tda8083_release(struct dvb_frontend* fe)
 407 {
 408         struct tda8083_state* state = fe->demodulator_priv;
 409         kfree(state);
 410 }
 411
 412 static struct dvb_frontend_ops tda8083_ops;
 413
 414 struct dvb_frontend* tda8083_attach(const struct tda8083_config* config,
 415                                     struct i2c_adapter* i2c)
 416 {
 417         struct tda8083_state* state = NULL;
 418
 419         /* allocate memory for the internal state */
 420         state = kmalloc(sizeof(struct tda8083_state), GFP_KERNEL);
 421         if (state == NULL) goto error;
 422
 423         /* setup the state */
 424         state->config = config;
 425         state->i2c = i2c;
 426
 427         /* check if the demod is there */
 428         if ((tda8083_readreg(state, 0x00)) != 0x05) goto error;
 429
 430         /* create dvb_frontend */
 431         memcpy(&state->frontend.ops, &tda8083_ops, sizeof(struct dvb_frontend_ops));
 432         state->frontend.demodulator_priv = state;
 433         return &state->frontend;
 434
 435 error:
 436         kfree(state);
 437         return NULL;
 438 }
 439
 440 static struct dvb_frontend_ops tda8083_ops = {
 441
 442         .info = {
 443                 .name                   = "Philips TDA8083 DVB-S",
 444                 .type                   = FE_QPSK,
 445                 .frequency_min          = 920000,     /* TDA8060 */
 446                 .frequency_max          = 2200000,    /* TDA8060 */
 447                 .frequency_stepsize     = 125,   /* kHz for QPSK frontends */
 448         /*      .frequency_tolerance    = ???,*/
 449                 .symbol_rate_min        = 12000000,
 450                 .symbol_rate_max        = 30000000,
 451         /*      .symbol_rate_tolerance  = ???,*/
 452                 .caps = FE_CAN_INVERSION_AUTO |
 453                         FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 454                         FE_CAN_FEC_4_5 | FE_CAN_FEC_5_6 | FE_CAN_FEC_6_7 |
 455                         FE_CAN_FEC_7_8 | FE_CAN_FEC_8_9 | FE_CAN_FEC_AUTO |
 456                         FE_CAN_QPSK | FE_CAN_MUTE_TS
 457         },
 458
 459         .release = tda8083_release,
 460
 461         .init = tda8083_init,
 462         .sleep = tda8083_sleep,
 463
 464         .set_frontend = tda8083_set_frontend,
 465         .get_frontend = tda8083_get_frontend,
 466
 467         .read_status = tda8083_read_status,
 468         .read_signal_strength = tda8083_read_signal_strength,
 469         .read_snr = tda8083_read_snr,
 470         .read_ber = tda8083_read_ber,
 471         .read_ucblocks = tda8083_read_ucblocks,
 472
 473         .diseqc_send_master_cmd = tda8083_send_diseqc_msg,
 474         .diseqc_send_burst = tda8083_diseqc_send_burst,
 475         .set_tone = tda8083_diseqc_set_tone,
 476         .set_voltage = tda8083_diseqc_set_voltage,
 477 };
 478
 479 module_param(debug, int, 0644);
 480 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
 481
 482 MODULE_DESCRIPTION("Philips TDA8083 DVB-S Demodulator");
 483 MODULE_AUTHOR("Ralph Metzler, Holger Waechtler");
 484 MODULE_LICENSE("GPL");
 485
 486 EXPORT_SYMBOL(tda8083_attach);