linux/drivers/media/dvb-frontends/mt352.c
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   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
  44struct mt352_state {
  45        struct i2c_adapter* i2c;
  46        struct dvb_frontend frontend;
  47
  48        /* configuration settings */
  49        struct mt352_config config;
  50};
  51
  52static int debug;
  53#define dprintk(args...) \
  54        do { \
  55                if (debug) printk(KERN_DEBUG "mt352: " args); \
  56        } while (0)
  57
  58static 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
  72static 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
  82static 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
 105static 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
 113static 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
 143static 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
 169static 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
 314static int mt352_get_parameters(struct dvb_frontend* fe,
 315                                struct dtv_frontend_properties *op)
 316{
 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
 420static int mt352_read_status(struct dvb_frontend *fe, enum fe_status *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
 463static 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
 474static 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
 487static 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
 497static 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
 507static 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
 516static 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
 535static void mt352_release(struct dvb_frontend* fe)
 536{
 537        struct mt352_state* state = fe->demodulator_priv;
 538        kfree(state);
 539}
 540
 541static struct dvb_frontend_ops mt352_ops;
 542
 543struct 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
 564error:
 565        kfree(state);
 566        return NULL;
 567}
 568
 569static 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
 603module_param(debug, int, 0644);
 604MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
 605
 606MODULE_DESCRIPTION("Zarlink MT352 DVB-T Demodulator driver");
 607MODULE_AUTHOR("Holger Waechtler, Daniel Mack, Antonio Mancuso");
 608MODULE_LICENSE("GPL");
 609
 610EXPORT_SYMBOL(mt352_attach);
 611