drivers/media/dvb-frontends/mt352.c

   1 /*
   2  *  Driver for Zarlink DVB-T MT352 demodulator
   3  *
   4  *  Written by Holger Waechtler <holger@qanu.de>
   5  *       and Daniel Mack <daniel@qanu.de>
   6  *
   7  *  AVerMedia AVerTV DVB-T 771 support by
   8  *       Wolfram Joost <dbox2@frokaschwei.de>
   9  *
  10  *  Support for Samsung TDTC9251DH01C(M) tuner
  11  *  Copyright (C) 2004 Antonio Mancuso <antonio.mancuso@digitaltelevision.it>
  12  *                     Amauri  Celani  <acelani@essegi.net>
  13  *
  14  *  DVICO FusionHDTV DVB-T1 and DVICO FusionHDTV DVB-T Lite support by
  15  *       Christopher Pascoe <c.pascoe@itee.uq.edu.au>
  16  *
  17  *  This program is free software; you can redistribute it and/or modify
  18  *  it under the terms of the GNU General Public License as published by
  19  *  the Free Software Foundation; either version 2 of the License, or
  20  *  (at your option) any later version.
  21  *
  22  *  This program is distributed in the hope that it will be useful,
  23  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25  *
  26  *  GNU General Public License for more details.
  27  *
  28  *  You should have received a copy of the GNU General Public License
  29  *  along with this program; if not, write to the Free Software
  30  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.=
  31  */
  32
  33 #include <linux/kernel.h>
  34 #include <linux/module.h>
  35 #include <linux/init.h>
  36 #include <linux/delay.h>
  37 #include <linux/string.h>
  38 #include <linux/slab.h>
  39
  40 #include "dvb_frontend.h"
  41 #include "mt352_priv.h"
  42 #include "mt352.h"
  43
  44 struct mt352_state {
  45         struct i2c_adapter* i2c;
  46         struct dvb_frontend frontend;
  47
  48         /* configuration settings */
  49         struct mt352_config config;
  50 };
  51
  52 static int debug;
  53 #define dprintk(args...) \
  54         do { \
  55                 if (debug) printk(KERN_DEBUG "mt352: " args); \
  56         } while (0)
  57
  58 static int mt352_single_write(struct dvb_frontend *fe, u8 reg, u8 val)
  59 {
  60         struct mt352_state* state = fe->demodulator_priv;
  61         u8 buf[2] = { reg, val };
  62         struct i2c_msg msg = { .addr = state->config.demod_address, .flags = 0,
  63                                .buf = buf, .len = 2 };
  64         int err = i2c_transfer(state->i2c, &msg, 1);
  65         if (err != 1) {
  66                 printk("mt352_write() to reg %x failed (err = %d)!\n", reg, err);
  67                 return err;
  68         }
  69         return 0;
  70 }
  71
  72 static int _mt352_write(struct dvb_frontend* fe, const u8 ibuf[], int ilen)
  73 {
  74         int err,i;
  75         for (i=0; i < ilen-1; i++)
  76                 if ((err = mt352_single_write(fe,ibuf[0]+i,ibuf[i+1])))
  77                         return err;
  78
  79         return 0;
  80 }
  81
  82 static int mt352_read_register(struct mt352_state* state, u8 reg)
  83 {
  84         int ret;
  85         u8 b0 [] = { reg };
  86         u8 b1 [] = { 0 };
  87         struct i2c_msg msg [] = { { .addr = state->config.demod_address,
  88                                     .flags = 0,
  89                                     .buf = b0, .len = 1 },
  90                                   { .addr = state->config.demod_address,
  91                                     .flags = I2C_M_RD,
  92                                     .buf = b1, .len = 1 } };
  93
  94         ret = i2c_transfer(state->i2c, msg, 2);
  95
  96         if (ret != 2) {
  97                 printk("%s: readreg error (reg=%d, ret==%i)\n",
  98                        __func__, reg, ret);
  99                 return ret;
 100         }
 101
 102         return b1[0];
 103 }
 104
 105 static int mt352_sleep(struct dvb_frontend* fe)
 106 {
 107         static u8 mt352_softdown[] = { CLOCK_CTL, 0x20, 0x08 };
 108
 109         _mt352_write(fe, mt352_softdown, sizeof(mt352_softdown));
 110         return 0;
 111 }
 112
 113 static void mt352_calc_nominal_rate(struct mt352_state* state,
 114                                     u32 bandwidth,
 115                                     unsigned char *buf)
 116 {
 117         u32 adc_clock = 20480; /* 20.340 MHz */
 118         u32 bw,value;
 119
 120         switch (bandwidth) {
 121         case 6000000:
 122                 bw = 6;
 123                 break;
 124         case 7000000:
 125                 bw = 7;
 126                 break;
 127         case 8000000:
 128         default:
 129                 bw = 8;
 130                 break;
 131         }
 132         if (state->config.adc_clock)
 133                 adc_clock = state->config.adc_clock;
 134
 135         value = 64 * bw * (1<<16) / (7 * 8);
 136         value = value * 1000 / adc_clock;
 137         dprintk("%s: bw %d, adc_clock %d => 0x%x\n",
 138                 __func__, bw, adc_clock, value);
 139         buf[0] = msb(value);
 140         buf[1] = lsb(value);
 141 }
 142
 143 static void mt352_calc_input_freq(struct mt352_state* state,
 144                                   unsigned char *buf)
 145 {
 146         int adc_clock = 20480; /* 20.480000 MHz */
 147         int if2       = 36167; /* 36.166667 MHz */
 148         int ife,value;
 149
 150         if (state->config.adc_clock)
 151                 adc_clock = state->config.adc_clock;
 152         if (state->config.if2)
 153                 if2 = state->config.if2;
 154
 155         if (adc_clock >= if2 * 2)
 156                 ife = if2;
 157         else {
 158                 ife = adc_clock - (if2 % adc_clock);
 159                 if (ife > adc_clock / 2)
 160                         ife = adc_clock - ife;
 161         }
 162         value = -16374 * ife / adc_clock;
 163         dprintk("%s: if2 %d, ife %d, adc_clock %d => %d / 0x%x\n",
 164                 __func__, if2, ife, adc_clock, value, value & 0x3fff);
 165         buf[0] = msb(value);
 166         buf[1] = lsb(value);
 167 }
 168
 169 static int mt352_set_parameters(struct dvb_frontend *fe)
 170 {
 171         struct dtv_frontend_properties *op = &fe->dtv_property_cache;
 172         struct mt352_state* state = fe->demodulator_priv;
 173         unsigned char buf[13];
 174         static unsigned char tuner_go[] = { 0x5d, 0x01 };
 175         static unsigned char fsm_go[]   = { 0x5e, 0x01 };
 176         unsigned int tps = 0;
 177
 178         switch (op->code_rate_HP) {
 179                 case FEC_2_3:
 180                         tps |= (1 << 7);
 181                         break;
 182                 case FEC_3_4:
 183                         tps |= (2 << 7);
 184                         break;
 185                 case FEC_5_6:
 186                         tps |= (3 << 7);
 187                         break;
 188                 case FEC_7_8:
 189                         tps |= (4 << 7);
 190                         break;
 191                 case FEC_1_2:
 192                 case FEC_AUTO:
 193                         break;
 194                 default:
 195                         return -EINVAL;
 196         }
 197
 198         switch (op->code_rate_LP) {
 199                 case FEC_2_3:
 200                         tps |= (1 << 4);
 201                         break;
 202                 case FEC_3_4:
 203                         tps |= (2 << 4);
 204                         break;
 205                 case FEC_5_6:
 206                         tps |= (3 << 4);
 207                         break;
 208                 case FEC_7_8:
 209                         tps |= (4 << 4);
 210                         break;
 211                 case FEC_1_2:
 212                 case FEC_AUTO:
 213                         break;
 214                 case FEC_NONE:
 215                         if (op->hierarchy == HIERARCHY_AUTO ||
 216                             op->hierarchy == HIERARCHY_NONE)
 217                                 break;
 218                 default:
 219                         return -EINVAL;
 220         }
 221
 222         switch (op->modulation) {
 223                 case QPSK:
 224                         break;
 225                 case QAM_AUTO:
 226                 case QAM_16:
 227                         tps |= (1 << 13);
 228                         break;
 229                 case QAM_64:
 230                         tps |= (2 << 13);
 231                         break;
 232                 default:
 233                         return -EINVAL;
 234         }
 235
 236         switch (op->transmission_mode) {
 237                 case TRANSMISSION_MODE_2K:
 238                 case TRANSMISSION_MODE_AUTO:
 239                         break;
 240                 case TRANSMISSION_MODE_8K:
 241                         tps |= (1 << 0);
 242                         break;
 243                 default:
 244                         return -EINVAL;
 245         }
 246
 247         switch (op->guard_interval) {
 248                 case GUARD_INTERVAL_1_32:
 249                 case GUARD_INTERVAL_AUTO:
 250                         break;
 251                 case GUARD_INTERVAL_1_16:
 252                         tps |= (1 << 2);
 253                         break;
 254                 case GUARD_INTERVAL_1_8:
 255                         tps |= (2 << 2);
 256                         break;
 257                 case GUARD_INTERVAL_1_4:
 258                         tps |= (3 << 2);
 259                         break;
 260                 default:
 261                         return -EINVAL;
 262         }
 263
 264         switch (op->hierarchy) {
 265                 case HIERARCHY_AUTO:
 266                 case HIERARCHY_NONE:
 267                         break;
 268                 case HIERARCHY_1:
 269                         tps |= (1 << 10);
 270                         break;
 271                 case HIERARCHY_2:
 272                         tps |= (2 << 10);
 273                         break;
 274                 case HIERARCHY_4:
 275                         tps |= (3 << 10);
 276                         break;
 277                 default:
 278                         return -EINVAL;
 279         }
 280
 281
 282         buf[0] = TPS_GIVEN_1; /* TPS_GIVEN_1 and following registers */
 283
 284         buf[1] = msb(tps);      /* TPS_GIVEN_(1|0) */
 285         buf[2] = lsb(tps);
 286
 287         buf[3] = 0x50;  // old
 288 //      buf[3] = 0xf4;  // pinnacle
 289
 290         mt352_calc_nominal_rate(state, op->bandwidth_hz, buf+4);
 291         mt352_calc_input_freq(state, buf+6);
 292
 293         if (state->config.no_tuner) {
 294                 if (fe->ops.tuner_ops.set_params) {
 295                         fe->ops.tuner_ops.set_params(fe);
 296                         if (fe->ops.i2c_gate_ctrl)
 297                                 fe->ops.i2c_gate_ctrl(fe, 0);
 298                 }
 299
 300                 _mt352_write(fe, buf, 8);
 301                 _mt352_write(fe, fsm_go, 2);
 302         } else {
 303                 if (fe->ops.tuner_ops.calc_regs) {
 304                         fe->ops.tuner_ops.calc_regs(fe, buf+8, 5);
 305                         buf[8] <<= 1;
 306                         _mt352_write(fe, buf, sizeof(buf));
 307                         _mt352_write(fe, tuner_go, 2);
 308                 }
 309         }
 310
 311         return 0;
 312 }
 313
 314 static int mt352_get_parameters(struct dvb_frontend* fe)
 315 {
 316         struct dtv_frontend_properties *op = &fe->dtv_property_cache;
 317         struct mt352_state* state = fe->demodulator_priv;
 318         u16 tps;
 319         u16 div;
 320         u8 trl;
 321         static const u8 tps_fec_to_api[8] =
 322         {
 323                 FEC_1_2,
 324                 FEC_2_3,
 325                 FEC_3_4,
 326                 FEC_5_6,
 327                 FEC_7_8,
 328                 FEC_AUTO,
 329                 FEC_AUTO,
 330                 FEC_AUTO
 331         };
 332
 333         if ( (mt352_read_register(state,0x00) & 0xC0) != 0xC0 )
 334                 return -EINVAL;
 335
 336         /* Use TPS_RECEIVED-registers, not the TPS_CURRENT-registers because
 337          * the mt352 sometimes works with the wrong parameters
 338          */
 339         tps = (mt352_read_register(state, TPS_RECEIVED_1) << 8) | mt352_read_register(state, TPS_RECEIVED_0);
 340         div = (mt352_read_register(state, CHAN_START_1) << 8) | mt352_read_register(state, CHAN_START_0);
 341         trl = mt352_read_register(state, TRL_NOMINAL_RATE_1);
 342
 343         op->code_rate_HP = tps_fec_to_api[(tps >> 7) & 7];
 344         op->code_rate_LP = tps_fec_to_api[(tps >> 4) & 7];
 345
 346         switch ( (tps >> 13) & 3)
 347         {
 348                 case 0:
 349                         op->modulation = QPSK;
 350                         break;
 351                 case 1:
 352                         op->modulation = QAM_16;
 353                         break;
 354                 case 2:
 355                         op->modulation = QAM_64;
 356                         break;
 357                 default:
 358                         op->modulation = QAM_AUTO;
 359                         break;
 360         }
 361
 362         op->transmission_mode = (tps & 0x01) ? TRANSMISSION_MODE_8K : TRANSMISSION_MODE_2K;
 363
 364         switch ( (tps >> 2) & 3)
 365         {
 366                 case 0:
 367                         op->guard_interval = GUARD_INTERVAL_1_32;
 368                         break;
 369                 case 1:
 370                         op->guard_interval = GUARD_INTERVAL_1_16;
 371                         break;
 372                 case 2:
 373                         op->guard_interval = GUARD_INTERVAL_1_8;
 374                         break;
 375                 case 3:
 376                         op->guard_interval = GUARD_INTERVAL_1_4;
 377                         break;
 378                 default:
 379                         op->guard_interval = GUARD_INTERVAL_AUTO;
 380                         break;
 381         }
 382
 383         switch ( (tps >> 10) & 7)
 384         {
 385                 case 0:
 386                         op->hierarchy = HIERARCHY_NONE;
 387                         break;
 388                 case 1:
 389                         op->hierarchy = HIERARCHY_1;
 390                         break;
 391                 case 2:
 392                         op->hierarchy = HIERARCHY_2;
 393                         break;
 394                 case 3:
 395                         op->hierarchy = HIERARCHY_4;
 396                         break;
 397                 default:
 398                         op->hierarchy = HIERARCHY_AUTO;
 399                         break;
 400         }
 401
 402         op->frequency = (500 * (div - IF_FREQUENCYx6)) / 3 * 1000;
 403
 404         if (trl == 0x72)
 405                 op->bandwidth_hz = 8000000;
 406         else if (trl == 0x64)
 407                 op->bandwidth_hz = 7000000;
 408         else
 409                 op->bandwidth_hz = 6000000;
 410
 411
 412         if (mt352_read_register(state, STATUS_2) & 0x02)
 413                 op->inversion = INVERSION_OFF;
 414         else
 415                 op->inversion = INVERSION_ON;
 416
 417         return 0;
 418 }
 419
 420 static int mt352_read_status(struct dvb_frontend* fe, fe_status_t* status)
 421 {
 422         struct mt352_state* state = fe->demodulator_priv;
 423         int s0, s1, s3;
 424
 425         /* FIXME:
 426          *
 427          * The MT352 design manual from Zarlink states (page 46-47):
 428          *
 429          * Notes about the TUNER_GO register:
 430          *
 431          * If the Read_Tuner_Byte (bit-1) is activated, then the tuner status
 432          * byte is copied from the tuner to the STATUS_3 register and
 433          * completion of the read operation is indicated by bit-5 of the
 434          * INTERRUPT_3 register.
 435          */
 436
 437         if ((s0 = mt352_read_register(state, STATUS_0)) < 0)
 438                 return -EREMOTEIO;
 439         if ((s1 = mt352_read_register(state, STATUS_1)) < 0)
 440                 return -EREMOTEIO;
 441         if ((s3 = mt352_read_register(state, STATUS_3)) < 0)
 442                 return -EREMOTEIO;
 443
 444         *status = 0;
 445         if (s0 & (1 << 4))
 446                 *status |= FE_HAS_CARRIER;
 447         if (s0 & (1 << 1))
 448                 *status |= FE_HAS_VITERBI;
 449         if (s0 & (1 << 5))
 450                 *status |= FE_HAS_LOCK;
 451         if (s1 & (1 << 1))
 452                 *status |= FE_HAS_SYNC;
 453         if (s3 & (1 << 6))
 454                 *status |= FE_HAS_SIGNAL;
 455
 456         if ((*status & (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC)) !=
 457                       (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC))
 458                 *status &= ~FE_HAS_LOCK;
 459
 460         return 0;
 461 }
 462
 463 static int mt352_read_ber(struct dvb_frontend* fe, u32* ber)
 464 {
 465         struct mt352_state* state = fe->demodulator_priv;
 466
 467         *ber = (mt352_read_register (state, RS_ERR_CNT_2) << 16) |
 468                (mt352_read_register (state, RS_ERR_CNT_1) << 8) |
 469                (mt352_read_register (state, RS_ERR_CNT_0));
 470
 471         return 0;
 472 }
 473
 474 static int mt352_read_signal_strength(struct dvb_frontend* fe, u16* strength)
 475 {
 476         struct mt352_state* state = fe->demodulator_priv;
 477
 478         /* align the 12 bit AGC gain with the most significant bits */
 479         u16 signal = ((mt352_read_register(state, AGC_GAIN_1) & 0x0f) << 12) |
 480                 (mt352_read_register(state, AGC_GAIN_0) << 4);
 481
 482         /* inverse of gain is signal strength */
 483         *strength = ~signal;
 484         return 0;
 485 }
 486
 487 static int mt352_read_snr(struct dvb_frontend* fe, u16* snr)
 488 {
 489         struct mt352_state* state = fe->demodulator_priv;
 490
 491         u8 _snr = mt352_read_register (state, SNR);
 492         *snr = (_snr << 8) | _snr;
 493
 494         return 0;
 495 }
 496
 497 static int mt352_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
 498 {
 499         struct mt352_state* state = fe->demodulator_priv;
 500
 501         *ucblocks = (mt352_read_register (state,  RS_UBC_1) << 8) |
 502                     (mt352_read_register (state,  RS_UBC_0));
 503
 504         return 0;
 505 }
 506
 507 static int mt352_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fe_tune_settings)
 508 {
 509         fe_tune_settings->min_delay_ms = 800;
 510         fe_tune_settings->step_size = 0;
 511         fe_tune_settings->max_drift = 0;
 512
 513         return 0;
 514 }
 515
 516 static int mt352_init(struct dvb_frontend* fe)
 517 {
 518         struct mt352_state* state = fe->demodulator_priv;
 519
 520         static u8 mt352_reset_attach [] = { RESET, 0xC0 };
 521
 522         dprintk("%s: hello\n",__func__);
 523
 524         if ((mt352_read_register(state, CLOCK_CTL) & 0x10) == 0 ||
 525             (mt352_read_register(state, CONFIG) & 0x20) == 0) {
 526
 527                 /* Do a "hard" reset */
 528                 _mt352_write(fe, mt352_reset_attach, sizeof(mt352_reset_attach));
 529                 return state->config.demod_init(fe);
 530         }
 531
 532         return 0;
 533 }
 534
 535 static void mt352_release(struct dvb_frontend* fe)
 536 {
 537         struct mt352_state* state = fe->demodulator_priv;
 538         kfree(state);
 539 }
 540
 541 static struct dvb_frontend_ops mt352_ops;
 542
 543 struct dvb_frontend* mt352_attach(const struct mt352_config* config,
 544                                   struct i2c_adapter* i2c)
 545 {
 546         struct mt352_state* state = NULL;
 547
 548         /* allocate memory for the internal state */
 549         state = kzalloc(sizeof(struct mt352_state), GFP_KERNEL);
 550         if (state == NULL) goto error;
 551
 552         /* setup the state */
 553         state->i2c = i2c;
 554         memcpy(&state->config,config,sizeof(struct mt352_config));
 555
 556         /* check if the demod is there */
 557         if (mt352_read_register(state, CHIP_ID) != ID_MT352) goto error;
 558
 559         /* create dvb_frontend */
 560         memcpy(&state->frontend.ops, &mt352_ops, sizeof(struct dvb_frontend_ops));
 561         state->frontend.demodulator_priv = state;
 562         return &state->frontend;
 563
 564 error:
 565         kfree(state);
 566         return NULL;
 567 }
 568
 569 static struct dvb_frontend_ops mt352_ops = {
 570         .delsys = { SYS_DVBT },
 571         .info = {
 572                 .name                   = "Zarlink MT352 DVB-T",
 573                 .frequency_min          = 174000000,
 574                 .frequency_max          = 862000000,
 575                 .frequency_stepsize     = 166667,
 576                 .frequency_tolerance    = 0,
 577                 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 |
 578                         FE_CAN_FEC_3_4 | FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 |
 579                         FE_CAN_FEC_AUTO |
 580                         FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
 581                         FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_GUARD_INTERVAL_AUTO |
 582                         FE_CAN_HIERARCHY_AUTO | FE_CAN_RECOVER |
 583                         FE_CAN_MUTE_TS
 584         },
 585
 586         .release = mt352_release,
 587
 588         .init = mt352_init,
 589         .sleep = mt352_sleep,
 590         .write = _mt352_write,
 591
 592         .set_frontend = mt352_set_parameters,
 593         .get_frontend = mt352_get_parameters,
 594         .get_tune_settings = mt352_get_tune_settings,
 595
 596         .read_status = mt352_read_status,
 597         .read_ber = mt352_read_ber,
 598         .read_signal_strength = mt352_read_signal_strength,
 599         .read_snr = mt352_read_snr,
 600         .read_ucblocks = mt352_read_ucblocks,
 601 };
 602
 603 module_param(debug, int, 0644);
 604 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
 605
 606 MODULE_DESCRIPTION("Zarlink MT352 DVB-T Demodulator driver");
 607 MODULE_AUTHOR("Holger Waechtler, Daniel Mack, Antonio Mancuso");
 608 MODULE_LICENSE("GPL");
 609
 610 EXPORT_SYMBOL(mt352_attach);