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 <media/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,
 101                                  enum fe_spectral_inversion inversion)
 102 {
 103         /*  XXX FIXME: implement other modes than FEC_AUTO */
 104         if (inversion == INVERSION_AUTO)
 105                 return 0;
 106
 107         return -EINVAL;
 108 }
 109
 110 static int tda8083_set_fec(struct tda8083_state *state, enum fe_code_rate fec)
 111 {
 112         if (fec == FEC_AUTO)
 113                 return tda8083_writereg (state, 0x07, 0xff);
 114
 115         if (fec >= FEC_1_2 && fec <= FEC_8_9)
 116                 return tda8083_writereg (state, 0x07, 1 << (FEC_8_9 - fec));
 117
 118         return -EINVAL;
 119 }
 120
 121 static enum fe_code_rate tda8083_get_fec(struct tda8083_state *state)
 122 {
 123         u8 index;
 124         static enum fe_code_rate fec_tab[] = {
 125                 FEC_8_9, FEC_1_2, FEC_2_3, FEC_3_4,
 126                 FEC_4_5, FEC_5_6, FEC_6_7, FEC_7_8
 127         };
 128
 129         index = tda8083_readreg(state, 0x0e) & 0x07;
 130
 131         return fec_tab [index];
 132 }
 133
 134 static int tda8083_set_symbolrate (struct tda8083_state* state, u32 srate)
 135 {
 136         u32 ratio;
 137         u32 tmp;
 138         u8 filter;
 139
 140         if (srate > 32000000)
 141                 srate = 32000000;
 142         if (srate < 500000)
 143                 srate = 500000;
 144
 145         filter = 0;
 146         if (srate < 24000000)
 147                 filter = 2;
 148         if (srate < 16000000)
 149                 filter = 3;
 150
 151         tmp = 31250 << 16;
 152         ratio = tmp / srate;
 153
 154         tmp = (tmp % srate) << 8;
 155         ratio = (ratio << 8) + tmp / srate;
 156
 157         tmp = (tmp % srate) << 8;
 158         ratio = (ratio << 8) + tmp / srate;
 159
 160         dprintk("tda8083: ratio == %08x\n", (unsigned int) ratio);
 161
 162         tda8083_writereg (state, 0x05, filter);
 163         tda8083_writereg (state, 0x02, (ratio >> 16) & 0xff);
 164         tda8083_writereg (state, 0x03, (ratio >>  8) & 0xff);
 165         tda8083_writereg (state, 0x04, (ratio      ) & 0xff);
 166
 167         tda8083_writereg (state, 0x00, 0x3c);
 168         tda8083_writereg (state, 0x00, 0x04);
 169
 170         return 1;
 171 }
 172
 173 static void tda8083_wait_diseqc_fifo (struct tda8083_state* state, int timeout)
 174 {
 175         unsigned long start = jiffies;
 176
 177         while (jiffies - start < timeout &&
 178                !(tda8083_readreg(state, 0x02) & 0x80))
 179         {
 180                 msleep(50);
 181         }
 182 }
 183
 184 static int tda8083_set_tone(struct tda8083_state *state,
 185                             enum fe_sec_tone_mode tone)
 186 {
 187         tda8083_writereg (state, 0x26, 0xf1);
 188
 189         switch (tone) {
 190         case SEC_TONE_OFF:
 191                 return tda8083_writereg (state, 0x29, 0x00);
 192         case SEC_TONE_ON:
 193                 return tda8083_writereg (state, 0x29, 0x80);
 194         default:
 195                 return -EINVAL;
 196         }
 197 }
 198
 199 static int tda8083_set_voltage(struct tda8083_state *state,
 200                                enum fe_sec_voltage voltage)
 201 {
 202         switch (voltage) {
 203         case SEC_VOLTAGE_13:
 204                 return tda8083_writereg (state, 0x20, 0x00);
 205         case SEC_VOLTAGE_18:
 206                 return tda8083_writereg (state, 0x20, 0x11);
 207         default:
 208                 return -EINVAL;
 209         }
 210 }
 211
 212 static int tda8083_send_diseqc_burst(struct tda8083_state *state,
 213                                      enum fe_sec_mini_cmd burst)
 214 {
 215         switch (burst) {
 216         case SEC_MINI_A:
 217                 tda8083_writereg (state, 0x29, (5 << 2));  /* send burst A */
 218                 break;
 219         case SEC_MINI_B:
 220                 tda8083_writereg (state, 0x29, (7 << 2));  /* send B */
 221                 break;
 222         default:
 223                 return -EINVAL;
 224         }
 225
 226         tda8083_wait_diseqc_fifo (state, 100);
 227
 228         return 0;
 229 }
 230
 231 static int tda8083_send_diseqc_msg(struct dvb_frontend *fe,
 232                                    struct dvb_diseqc_master_cmd *m)
 233 {
 234         struct tda8083_state* state = fe->demodulator_priv;
 235         int i;
 236
 237         tda8083_writereg (state, 0x29, (m->msg_len - 3) | (1 << 2)); /* enable */
 238
 239         for (i=0; i<m->msg_len; i++)
 240                 tda8083_writereg (state, 0x23 + i, m->msg[i]);
 241
 242         tda8083_writereg (state, 0x29, (m->msg_len - 3) | (3 << 2)); /* send!! */
 243
 244         tda8083_wait_diseqc_fifo (state, 100);
 245
 246         return 0;
 247 }
 248
 249 static int tda8083_read_status(struct dvb_frontend *fe,
 250                                enum fe_status *status)
 251 {
 252         struct tda8083_state* state = fe->demodulator_priv;
 253
 254         u8 signal = ~tda8083_readreg (state, 0x01);
 255         u8 sync = tda8083_readreg (state, 0x02);
 256
 257         *status = 0;
 258
 259         if (signal > 10)
 260                 *status |= FE_HAS_SIGNAL;
 261
 262         if (sync & 0x01)
 263                 *status |= FE_HAS_CARRIER;
 264
 265         if (sync & 0x02)
 266                 *status |= FE_HAS_VITERBI;
 267
 268         if (sync & 0x10)
 269                 *status |= FE_HAS_SYNC;
 270
 271         if (sync & 0x20) /* frontend can not lock */
 272                 *status |= FE_TIMEDOUT;
 273
 274         if ((sync & 0x1f) == 0x1f)
 275                 *status |= FE_HAS_LOCK;
 276
 277         return 0;
 278 }
 279
 280 static int tda8083_read_ber(struct dvb_frontend* fe, u32* ber)
 281 {
 282         struct tda8083_state* state = fe->demodulator_priv;
 283         int ret;
 284         u8 buf[3];
 285
 286         if ((ret = tda8083_readregs(state, 0x0b, buf, sizeof(buf))))
 287                 return ret;
 288
 289         *ber = ((buf[0] & 0x1f) << 16) | (buf[1] << 8) | buf[2];
 290
 291         return 0;
 292 }
 293
 294 static int tda8083_read_signal_strength(struct dvb_frontend* fe, u16* strength)
 295 {
 296         struct tda8083_state* state = fe->demodulator_priv;
 297
 298         u8 signal = ~tda8083_readreg (state, 0x01);
 299         *strength = (signal << 8) | signal;
 300
 301         return 0;
 302 }
 303
 304 static int tda8083_read_snr(struct dvb_frontend* fe, u16* snr)
 305 {
 306         struct tda8083_state* state = fe->demodulator_priv;
 307
 308         u8 _snr = tda8083_readreg (state, 0x08);
 309         *snr = (_snr << 8) | _snr;
 310
 311         return 0;
 312 }
 313
 314 static int tda8083_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
 315 {
 316         struct tda8083_state* state = fe->demodulator_priv;
 317
 318         *ucblocks = tda8083_readreg(state, 0x0f);
 319         if (*ucblocks == 0xff)
 320                 *ucblocks = 0xffffffff;
 321
 322         return 0;
 323 }
 324
 325 static int tda8083_set_frontend(struct dvb_frontend *fe)
 326 {
 327         struct dtv_frontend_properties *p = &fe->dtv_property_cache;
 328         struct tda8083_state* state = fe->demodulator_priv;
 329
 330         if (fe->ops.tuner_ops.set_params) {
 331                 fe->ops.tuner_ops.set_params(fe);
 332                 if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
 333         }
 334
 335         tda8083_set_inversion (state, p->inversion);
 336         tda8083_set_fec(state, p->fec_inner);
 337         tda8083_set_symbolrate(state, p->symbol_rate);
 338
 339         tda8083_writereg (state, 0x00, 0x3c);
 340         tda8083_writereg (state, 0x00, 0x04);
 341
 342         return 0;
 343 }
 344
 345 static int tda8083_get_frontend(struct dvb_frontend *fe,
 346                                 struct dtv_frontend_properties *p)
 347 {
 348         struct tda8083_state* state = fe->demodulator_priv;
 349
 350         /*  FIXME: get symbolrate & frequency offset...*/
 351         /*p->frequency = ???;*/
 352         p->inversion = (tda8083_readreg (state, 0x0e) & 0x80) ?
 353                         INVERSION_ON : INVERSION_OFF;
 354         p->fec_inner = tda8083_get_fec(state);
 355         /*p->symbol_rate = tda8083_get_symbolrate (state);*/
 356
 357         return 0;
 358 }
 359
 360 static int tda8083_sleep(struct dvb_frontend* fe)
 361 {
 362         struct tda8083_state* state = fe->demodulator_priv;
 363
 364         tda8083_writereg (state, 0x00, 0x02);
 365         return 0;
 366 }
 367
 368 static int tda8083_init(struct dvb_frontend* fe)
 369 {
 370         struct tda8083_state* state = fe->demodulator_priv;
 371         int i;
 372
 373         for (i=0; i<44; i++)
 374                 tda8083_writereg (state, i, tda8083_init_tab[i]);
 375
 376         tda8083_writereg (state, 0x00, 0x3c);
 377         tda8083_writereg (state, 0x00, 0x04);
 378
 379         return 0;
 380 }
 381
 382 static int tda8083_diseqc_send_burst(struct dvb_frontend *fe,
 383                                      enum fe_sec_mini_cmd burst)
 384 {
 385         struct tda8083_state* state = fe->demodulator_priv;
 386
 387         tda8083_send_diseqc_burst (state, burst);
 388         tda8083_writereg (state, 0x00, 0x3c);
 389         tda8083_writereg (state, 0x00, 0x04);
 390
 391         return 0;
 392 }
 393
 394 static int tda8083_diseqc_set_tone(struct dvb_frontend *fe,
 395                                    enum fe_sec_tone_mode tone)
 396 {
 397         struct tda8083_state* state = fe->demodulator_priv;
 398
 399         tda8083_set_tone (state, tone);
 400         tda8083_writereg (state, 0x00, 0x3c);
 401         tda8083_writereg (state, 0x00, 0x04);
 402
 403         return 0;
 404 }
 405
 406 static int tda8083_diseqc_set_voltage(struct dvb_frontend *fe,
 407                                       enum fe_sec_voltage voltage)
 408 {
 409         struct tda8083_state* state = fe->demodulator_priv;
 410
 411         tda8083_set_voltage (state, voltage);
 412         tda8083_writereg (state, 0x00, 0x3c);
 413         tda8083_writereg (state, 0x00, 0x04);
 414
 415         return 0;
 416 }
 417
 418 static void tda8083_release(struct dvb_frontend* fe)
 419 {
 420         struct tda8083_state* state = fe->demodulator_priv;
 421         kfree(state);
 422 }
 423
 424 static const struct dvb_frontend_ops tda8083_ops;
 425
 426 struct dvb_frontend* tda8083_attach(const struct tda8083_config* config,
 427                                     struct i2c_adapter* i2c)
 428 {
 429         struct tda8083_state* state = NULL;
 430
 431         /* allocate memory for the internal state */
 432         state = kzalloc(sizeof(struct tda8083_state), GFP_KERNEL);
 433         if (state == NULL) goto error;
 434
 435         /* setup the state */
 436         state->config = config;
 437         state->i2c = i2c;
 438
 439         /* check if the demod is there */
 440         if ((tda8083_readreg(state, 0x00)) != 0x05) goto error;
 441
 442         /* create dvb_frontend */
 443         memcpy(&state->frontend.ops, &tda8083_ops, sizeof(struct dvb_frontend_ops));
 444         state->frontend.demodulator_priv = state;
 445         return &state->frontend;
 446
 447 error:
 448         kfree(state);
 449         return NULL;
 450 }
 451
 452 static const struct dvb_frontend_ops tda8083_ops = {
 453         .delsys = { SYS_DVBS },
 454         .info = {
 455                 .name                   = "Philips TDA8083 DVB-S",
 456                 .frequency_min          = 920000,     /* TDA8060 */
 457                 .frequency_max          = 2200000,    /* TDA8060 */
 458                 .frequency_stepsize     = 125,   /* kHz for QPSK frontends */
 459         /*      .frequency_tolerance    = ???,*/
 460                 .symbol_rate_min        = 12000000,
 461                 .symbol_rate_max        = 30000000,
 462         /*      .symbol_rate_tolerance  = ???,*/
 463                 .caps = FE_CAN_INVERSION_AUTO |
 464                         FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 465                         FE_CAN_FEC_4_5 | FE_CAN_FEC_5_6 | FE_CAN_FEC_6_7 |
 466                         FE_CAN_FEC_7_8 | FE_CAN_FEC_8_9 | FE_CAN_FEC_AUTO |
 467                         FE_CAN_QPSK | FE_CAN_MUTE_TS
 468         },
 469
 470         .release = tda8083_release,
 471
 472         .init = tda8083_init,
 473         .sleep = tda8083_sleep,
 474
 475         .set_frontend = tda8083_set_frontend,
 476         .get_frontend = tda8083_get_frontend,
 477
 478         .read_status = tda8083_read_status,
 479         .read_signal_strength = tda8083_read_signal_strength,
 480         .read_snr = tda8083_read_snr,
 481         .read_ber = tda8083_read_ber,
 482         .read_ucblocks = tda8083_read_ucblocks,
 483
 484         .diseqc_send_master_cmd = tda8083_send_diseqc_msg,
 485         .diseqc_send_burst = tda8083_diseqc_send_burst,
 486         .set_tone = tda8083_diseqc_set_tone,
 487         .set_voltage = tda8083_diseqc_set_voltage,
 488 };
 489
 490 module_param(debug, int, 0644);
 491 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
 492
 493 MODULE_DESCRIPTION("Philips TDA8083 DVB-S Demodulator");
 494 MODULE_AUTHOR("Ralph Metzler, Holger Waechtler");
 495 MODULE_LICENSE("GPL");
 496
 497 EXPORT_SYMBOL(tda8083_attach);