drivers/media/usb/dvb-usb-v2/mxl111sf-demod.c

   1 /*
   2  *  mxl111sf-demod.c - driver for the MaxLinear MXL111SF DVB-T demodulator
   3  *
   4  *  Copyright (C) 2010 Michael Krufky <mkrufky@kernellabs.com>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #include "mxl111sf-demod.h"
  22 #include "mxl111sf-reg.h"
  23
  24 /* debug */
  25 static int mxl111sf_demod_debug;
  26 module_param_named(debug, mxl111sf_demod_debug, int, 0644);
  27 MODULE_PARM_DESC(debug, "set debugging level (1=info (or-able)).");
  28
  29 #define mxl_dbg(fmt, arg...) \
  30         if (mxl111sf_demod_debug) \
  31                 mxl_printk(KERN_DEBUG, fmt, ##arg)
  32
  33 /* ------------------------------------------------------------------------ */
  34
  35 struct mxl111sf_demod_state {
  36         struct mxl111sf_state *mxl_state;
  37
  38         struct mxl111sf_demod_config *cfg;
  39
  40         struct dvb_frontend fe;
  41 };
  42
  43 /* ------------------------------------------------------------------------ */
  44
  45 static int mxl111sf_demod_read_reg(struct mxl111sf_demod_state *state,
  46                                    u8 addr, u8 *data)
  47 {
  48         return (state->cfg->read_reg) ?
  49                 state->cfg->read_reg(state->mxl_state, addr, data) :
  50                 -EINVAL;
  51 }
  52
  53 static int mxl111sf_demod_write_reg(struct mxl111sf_demod_state *state,
  54                                     u8 addr, u8 data)
  55 {
  56         return (state->cfg->write_reg) ?
  57                 state->cfg->write_reg(state->mxl_state, addr, data) :
  58                 -EINVAL;
  59 }
  60
  61 static
  62 int mxl111sf_demod_program_regs(struct mxl111sf_demod_state *state,
  63                                 struct mxl111sf_reg_ctrl_info *ctrl_reg_info)
  64 {
  65         return (state->cfg->program_regs) ?
  66                 state->cfg->program_regs(state->mxl_state, ctrl_reg_info) :
  67                 -EINVAL;
  68 }
  69
  70 /* ------------------------------------------------------------------------ */
  71 /* TPS */
  72
  73 static
  74 int mxl1x1sf_demod_get_tps_code_rate(struct mxl111sf_demod_state *state,
  75                                      fe_code_rate_t *code_rate)
  76 {
  77         u8 val;
  78         int ret = mxl111sf_demod_read_reg(state, V6_CODE_RATE_TPS_REG, &val);
  79         /* bit<2:0> - 000:1/2, 001:2/3, 010:3/4, 011:5/6, 100:7/8 */
  80         if (mxl_fail(ret))
  81                 goto fail;
  82
  83         switch (val & V6_CODE_RATE_TPS_MASK) {
  84         case 0:
  85                 *code_rate = FEC_1_2;
  86                 break;
  87         case 1:
  88                 *code_rate = FEC_2_3;
  89                 break;
  90         case 2:
  91                 *code_rate = FEC_3_4;
  92                 break;
  93         case 3:
  94                 *code_rate = FEC_5_6;
  95                 break;
  96         case 4:
  97                 *code_rate = FEC_7_8;
  98                 break;
  99         }
 100 fail:
 101         return ret;
 102 }
 103
 104 static
 105 int mxl1x1sf_demod_get_tps_modulation(struct mxl111sf_demod_state *state,
 106                                          fe_modulation_t *modulation)
 107 {
 108         u8 val;
 109         int ret = mxl111sf_demod_read_reg(state, V6_MODORDER_TPS_REG, &val);
 110         /* Constellation, 00 : QPSK, 01 : 16QAM, 10:64QAM */
 111         if (mxl_fail(ret))
 112                 goto fail;
 113
 114         switch ((val & V6_PARAM_CONSTELLATION_MASK) >> 4) {
 115         case 0:
 116                 *modulation = QPSK;
 117                 break;
 118         case 1:
 119                 *modulation = QAM_16;
 120                 break;
 121         case 2:
 122                 *modulation = QAM_64;
 123                 break;
 124         }
 125 fail:
 126         return ret;
 127 }
 128
 129 static
 130 int mxl1x1sf_demod_get_tps_guard_fft_mode(struct mxl111sf_demod_state *state,
 131                                           fe_transmit_mode_t *fft_mode)
 132 {
 133         u8 val;
 134         int ret = mxl111sf_demod_read_reg(state, V6_MODE_TPS_REG, &val);
 135         /* FFT Mode, 00:2K, 01:8K, 10:4K */
 136         if (mxl_fail(ret))
 137                 goto fail;
 138
 139         switch ((val & V6_PARAM_FFT_MODE_MASK) >> 2) {
 140         case 0:
 141                 *fft_mode = TRANSMISSION_MODE_2K;
 142                 break;
 143         case 1:
 144                 *fft_mode = TRANSMISSION_MODE_8K;
 145                 break;
 146         case 2:
 147                 *fft_mode = TRANSMISSION_MODE_4K;
 148                 break;
 149         }
 150 fail:
 151         return ret;
 152 }
 153
 154 static
 155 int mxl1x1sf_demod_get_tps_guard_interval(struct mxl111sf_demod_state *state,
 156                                           fe_guard_interval_t *guard)
 157 {
 158         u8 val;
 159         int ret = mxl111sf_demod_read_reg(state, V6_CP_TPS_REG, &val);
 160         /* 00:1/32, 01:1/16, 10:1/8, 11:1/4 */
 161         if (mxl_fail(ret))
 162                 goto fail;
 163
 164         switch ((val & V6_PARAM_GI_MASK) >> 4) {
 165         case 0:
 166                 *guard = GUARD_INTERVAL_1_32;
 167                 break;
 168         case 1:
 169                 *guard = GUARD_INTERVAL_1_16;
 170                 break;
 171         case 2:
 172                 *guard = GUARD_INTERVAL_1_8;
 173                 break;
 174         case 3:
 175                 *guard = GUARD_INTERVAL_1_4;
 176                 break;
 177         }
 178 fail:
 179         return ret;
 180 }
 181
 182 static
 183 int mxl1x1sf_demod_get_tps_hierarchy(struct mxl111sf_demod_state *state,
 184                                      fe_hierarchy_t *hierarchy)
 185 {
 186         u8 val;
 187         int ret = mxl111sf_demod_read_reg(state, V6_TPS_HIERACHY_REG, &val);
 188         /* bit<6:4> - 000:Non hierarchy, 001:1, 010:2, 011:4 */
 189         if (mxl_fail(ret))
 190                 goto fail;
 191
 192         switch ((val & V6_TPS_HIERARCHY_INFO_MASK) >> 6) {
 193         case 0:
 194                 *hierarchy = HIERARCHY_NONE;
 195                 break;
 196         case 1:
 197                 *hierarchy = HIERARCHY_1;
 198                 break;
 199         case 2:
 200                 *hierarchy = HIERARCHY_2;
 201                 break;
 202         case 3:
 203                 *hierarchy = HIERARCHY_4;
 204                 break;
 205         }
 206 fail:
 207         return ret;
 208 }
 209
 210 /* ------------------------------------------------------------------------ */
 211 /* LOCKS */
 212
 213 static
 214 int mxl1x1sf_demod_get_sync_lock_status(struct mxl111sf_demod_state *state,
 215                                         int *sync_lock)
 216 {
 217         u8 val = 0;
 218         int ret = mxl111sf_demod_read_reg(state, V6_SYNC_LOCK_REG, &val);
 219         if (mxl_fail(ret))
 220                 goto fail;
 221         *sync_lock = (val & SYNC_LOCK_MASK) >> 4;
 222 fail:
 223         return ret;
 224 }
 225
 226 static
 227 int mxl1x1sf_demod_get_rs_lock_status(struct mxl111sf_demod_state *state,
 228                                       int *rs_lock)
 229 {
 230         u8 val = 0;
 231         int ret = mxl111sf_demod_read_reg(state, V6_RS_LOCK_DET_REG, &val);
 232         if (mxl_fail(ret))
 233                 goto fail;
 234         *rs_lock = (val & RS_LOCK_DET_MASK) >> 3;
 235 fail:
 236         return ret;
 237 }
 238
 239 static
 240 int mxl1x1sf_demod_get_tps_lock_status(struct mxl111sf_demod_state *state,
 241                                        int *tps_lock)
 242 {
 243         u8 val = 0;
 244         int ret = mxl111sf_demod_read_reg(state, V6_TPS_LOCK_REG, &val);
 245         if (mxl_fail(ret))
 246                 goto fail;
 247         *tps_lock = (val & V6_PARAM_TPS_LOCK_MASK) >> 6;
 248 fail:
 249         return ret;
 250 }
 251
 252 static
 253 int mxl1x1sf_demod_get_fec_lock_status(struct mxl111sf_demod_state *state,
 254                                        int *fec_lock)
 255 {
 256         u8 val = 0;
 257         int ret = mxl111sf_demod_read_reg(state, V6_IRQ_STATUS_REG, &val);
 258         if (mxl_fail(ret))
 259                 goto fail;
 260         *fec_lock = (val & IRQ_MASK_FEC_LOCK) >> 4;
 261 fail:
 262         return ret;
 263 }
 264
 265 #if 0
 266 static
 267 int mxl1x1sf_demod_get_cp_lock_status(struct mxl111sf_demod_state *state,
 268                                       int *cp_lock)
 269 {
 270         u8 val = 0;
 271         int ret = mxl111sf_demod_read_reg(state, V6_CP_LOCK_DET_REG, &val);
 272         if (mxl_fail(ret))
 273                 goto fail;
 274         *cp_lock = (val & V6_CP_LOCK_DET_MASK) >> 2;
 275 fail:
 276         return ret;
 277 }
 278 #endif
 279
 280 static int mxl1x1sf_demod_reset_irq_status(struct mxl111sf_demod_state *state)
 281 {
 282         return mxl111sf_demod_write_reg(state, 0x0e, 0xff);
 283 }
 284
 285 /* ------------------------------------------------------------------------ */
 286
 287 static int mxl111sf_demod_set_frontend(struct dvb_frontend *fe)
 288 {
 289         struct mxl111sf_demod_state *state = fe->demodulator_priv;
 290         int ret = 0;
 291
 292         struct mxl111sf_reg_ctrl_info phy_pll_patch[] = {
 293                 {0x00, 0xff, 0x01}, /* change page to 1 */
 294                 {0x40, 0xff, 0x05},
 295                 {0x40, 0xff, 0x01},
 296                 {0x41, 0xff, 0xca},
 297                 {0x41, 0xff, 0xc0},
 298                 {0x00, 0xff, 0x00}, /* change page to 0 */
 299                 {0,    0,    0}
 300         };
 301
 302         mxl_dbg("()");
 303
 304         if (fe->ops.tuner_ops.set_params) {
 305                 ret = fe->ops.tuner_ops.set_params(fe);
 306                 if (mxl_fail(ret))
 307                         goto fail;
 308                 msleep(50);
 309         }
 310         ret = mxl111sf_demod_program_regs(state, phy_pll_patch);
 311         mxl_fail(ret);
 312         msleep(50);
 313         ret = mxl1x1sf_demod_reset_irq_status(state);
 314         mxl_fail(ret);
 315         msleep(100);
 316 fail:
 317         return ret;
 318 }
 319
 320 /* ------------------------------------------------------------------------ */
 321
 322 #if 0
 323 /* resets TS Packet error count */
 324 /* After setting 7th bit of V5_PER_COUNT_RESET_REG, it should be reset to 0. */
 325 static
 326 int mxl1x1sf_demod_reset_packet_error_count(struct mxl111sf_demod_state *state)
 327 {
 328         struct mxl111sf_reg_ctrl_info reset_per_count[] = {
 329                 {0x20, 0x01, 0x01},
 330                 {0x20, 0x01, 0x00},
 331                 {0,    0,    0}
 332         };
 333         return mxl111sf_demod_program_regs(state, reset_per_count);
 334 }
 335 #endif
 336
 337 /* returns TS Packet error count */
 338 /* PER Count = FEC_PER_COUNT * (2 ** (FEC_PER_SCALE * 4)) */
 339 static int mxl111sf_demod_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
 340 {
 341         struct mxl111sf_demod_state *state = fe->demodulator_priv;
 342         u32 fec_per_count, fec_per_scale;
 343         u8 val;
 344         int ret;
 345
 346         *ucblocks = 0;
 347
 348         /* FEC_PER_COUNT Register */
 349         ret = mxl111sf_demod_read_reg(state, V6_FEC_PER_COUNT_REG, &val);
 350         if (mxl_fail(ret))
 351                 goto fail;
 352
 353         fec_per_count = val;
 354
 355         /* FEC_PER_SCALE Register */
 356         ret = mxl111sf_demod_read_reg(state, V6_FEC_PER_SCALE_REG, &val);
 357         if (mxl_fail(ret))
 358                 goto fail;
 359
 360         val &= V6_FEC_PER_SCALE_MASK;
 361         val *= 4;
 362
 363         fec_per_scale = 1 << val;
 364
 365         fec_per_count *= fec_per_scale;
 366
 367         *ucblocks = fec_per_count;
 368 fail:
 369         return ret;
 370 }
 371
 372 #ifdef MXL111SF_DEMOD_ENABLE_CALCULATIONS
 373 /* FIXME: leaving this enabled breaks the build on some architectures,
 374  * and we shouldn't have any floating point math in the kernel, anyway.
 375  *
 376  * These macros need to be re-written, but it's harmless to simply
 377  * return zero for now. */
 378 #define CALCULATE_BER(avg_errors, count) \
 379         ((u32)(avg_errors * 4)/(count*64*188*8))
 380 #define CALCULATE_SNR(data) \
 381         ((u32)((10 * (u32)data / 64) - 2.5))
 382 #else
 383 #define CALCULATE_BER(avg_errors, count) 0
 384 #define CALCULATE_SNR(data) 0
 385 #endif
 386
 387 static int mxl111sf_demod_read_ber(struct dvb_frontend *fe, u32 *ber)
 388 {
 389         struct mxl111sf_demod_state *state = fe->demodulator_priv;
 390         u8 val1, val2, val3;
 391         int ret;
 392
 393         *ber = 0;
 394
 395         ret = mxl111sf_demod_read_reg(state, V6_RS_AVG_ERRORS_LSB_REG, &val1);
 396         if (mxl_fail(ret))
 397                 goto fail;
 398         ret = mxl111sf_demod_read_reg(state, V6_RS_AVG_ERRORS_MSB_REG, &val2);
 399         if (mxl_fail(ret))
 400                 goto fail;
 401         ret = mxl111sf_demod_read_reg(state, V6_N_ACCUMULATE_REG, &val3);
 402         if (mxl_fail(ret))
 403                 goto fail;
 404
 405         *ber = CALCULATE_BER((val1 | (val2 << 8)), val3);
 406 fail:
 407         return ret;
 408 }
 409
 410 static int mxl111sf_demod_calc_snr(struct mxl111sf_demod_state *state,
 411                                    u16 *snr)
 412 {
 413         u8 val1, val2;
 414         int ret;
 415
 416         *snr = 0;
 417
 418         ret = mxl111sf_demod_read_reg(state, V6_SNR_RB_LSB_REG, &val1);
 419         if (mxl_fail(ret))
 420                 goto fail;
 421         ret = mxl111sf_demod_read_reg(state, V6_SNR_RB_MSB_REG, &val2);
 422         if (mxl_fail(ret))
 423                 goto fail;
 424
 425         *snr = CALCULATE_SNR(val1 | ((val2 & 0x03) << 8));
 426 fail:
 427         return ret;
 428 }
 429
 430 static int mxl111sf_demod_read_snr(struct dvb_frontend *fe, u16 *snr)
 431 {
 432         struct mxl111sf_demod_state *state = fe->demodulator_priv;
 433
 434         int ret = mxl111sf_demod_calc_snr(state, snr);
 435         if (mxl_fail(ret))
 436                 goto fail;
 437
 438         *snr /= 10; /* 0.1 dB */
 439 fail:
 440         return ret;
 441 }
 442
 443 static int mxl111sf_demod_read_status(struct dvb_frontend *fe,
 444                                       fe_status_t *status)
 445 {
 446         struct mxl111sf_demod_state *state = fe->demodulator_priv;
 447         int ret, locked, cr_lock, sync_lock, fec_lock;
 448
 449         *status = 0;
 450
 451         ret = mxl1x1sf_demod_get_rs_lock_status(state, &locked);
 452         if (mxl_fail(ret))
 453                 goto fail;
 454         ret = mxl1x1sf_demod_get_tps_lock_status(state, &cr_lock);
 455         if (mxl_fail(ret))
 456                 goto fail;
 457         ret = mxl1x1sf_demod_get_sync_lock_status(state, &sync_lock);
 458         if (mxl_fail(ret))
 459                 goto fail;
 460         ret = mxl1x1sf_demod_get_fec_lock_status(state, &fec_lock);
 461         if (mxl_fail(ret))
 462                 goto fail;
 463
 464         if (locked)
 465                 *status |= FE_HAS_SIGNAL;
 466         if (cr_lock)
 467                 *status |= FE_HAS_CARRIER;
 468         if (sync_lock)
 469                 *status |= FE_HAS_SYNC;
 470         if (fec_lock) /* false positives? */
 471                 *status |= FE_HAS_VITERBI;
 472
 473         if ((locked) && (cr_lock) && (sync_lock))
 474                 *status |= FE_HAS_LOCK;
 475 fail:
 476         return ret;
 477 }
 478
 479 static int mxl111sf_demod_read_signal_strength(struct dvb_frontend *fe,
 480                                                u16 *signal_strength)
 481 {
 482         struct mxl111sf_demod_state *state = fe->demodulator_priv;
 483         fe_modulation_t modulation;
 484         u16 snr;
 485
 486         mxl111sf_demod_calc_snr(state, &snr);
 487         mxl1x1sf_demod_get_tps_modulation(state, &modulation);
 488
 489         switch (modulation) {
 490         case QPSK:
 491                 *signal_strength = (snr >= 1300) ?
 492                         min(65535, snr * 44) : snr * 38;
 493                 break;
 494         case QAM_16:
 495                 *signal_strength = (snr >= 1500) ?
 496                         min(65535, snr * 38) : snr * 33;
 497                 break;
 498         case QAM_64:
 499                 *signal_strength = (snr >= 2000) ?
 500                         min(65535, snr * 29) : snr * 25;
 501                 break;
 502         default:
 503                 *signal_strength = 0;
 504                 return -EINVAL;
 505         }
 506
 507         return 0;
 508 }
 509
 510 static int mxl111sf_demod_get_frontend(struct dvb_frontend *fe)
 511 {
 512         struct dtv_frontend_properties *p = &fe->dtv_property_cache;
 513         struct mxl111sf_demod_state *state = fe->demodulator_priv;
 514
 515         mxl_dbg("()");
 516 #if 0
 517         p->inversion = /* FIXME */ ? INVERSION_ON : INVERSION_OFF;
 518 #endif
 519         if (fe->ops.tuner_ops.get_bandwidth)
 520                 fe->ops.tuner_ops.get_bandwidth(fe, &p->bandwidth_hz);
 521         if (fe->ops.tuner_ops.get_frequency)
 522                 fe->ops.tuner_ops.get_frequency(fe, &p->frequency);
 523         mxl1x1sf_demod_get_tps_code_rate(state, &p->code_rate_HP);
 524         mxl1x1sf_demod_get_tps_code_rate(state, &p->code_rate_LP);
 525         mxl1x1sf_demod_get_tps_modulation(state, &p->modulation);
 526         mxl1x1sf_demod_get_tps_guard_fft_mode(state,
 527                                               &p->transmission_mode);
 528         mxl1x1sf_demod_get_tps_guard_interval(state,
 529                                               &p->guard_interval);
 530         mxl1x1sf_demod_get_tps_hierarchy(state,
 531                                          &p->hierarchy);
 532
 533         return 0;
 534 }
 535
 536 static
 537 int mxl111sf_demod_get_tune_settings(struct dvb_frontend *fe,
 538                                      struct dvb_frontend_tune_settings *tune)
 539 {
 540         tune->min_delay_ms = 1000;
 541         return 0;
 542 }
 543
 544 static void mxl111sf_demod_release(struct dvb_frontend *fe)
 545 {
 546         struct mxl111sf_demod_state *state = fe->demodulator_priv;
 547         mxl_dbg("()");
 548         kfree(state);
 549         fe->demodulator_priv = NULL;
 550 }
 551
 552 static struct dvb_frontend_ops mxl111sf_demod_ops = {
 553         .delsys = { SYS_DVBT },
 554         .info = {
 555                 .name               = "MaxLinear MxL111SF DVB-T demodulator",
 556                 .frequency_min      = 177000000,
 557                 .frequency_max      = 858000000,
 558                 .frequency_stepsize = 166666,
 559                 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 560                         FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
 561                         FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 |
 562                         FE_CAN_QAM_AUTO |
 563                         FE_CAN_HIERARCHY_AUTO | FE_CAN_GUARD_INTERVAL_AUTO |
 564                         FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_RECOVER
 565         },
 566         .release              = mxl111sf_demod_release,
 567 #if 0
 568         .init                 = mxl111sf_init,
 569         .i2c_gate_ctrl        = mxl111sf_i2c_gate_ctrl,
 570 #endif
 571         .set_frontend         = mxl111sf_demod_set_frontend,
 572         .get_frontend         = mxl111sf_demod_get_frontend,
 573         .get_tune_settings    = mxl111sf_demod_get_tune_settings,
 574         .read_status          = mxl111sf_demod_read_status,
 575         .read_signal_strength = mxl111sf_demod_read_signal_strength,
 576         .read_ber             = mxl111sf_demod_read_ber,
 577         .read_snr             = mxl111sf_demod_read_snr,
 578         .read_ucblocks        = mxl111sf_demod_read_ucblocks,
 579 };
 580
 581 struct dvb_frontend *mxl111sf_demod_attach(struct mxl111sf_state *mxl_state,
 582                                            struct mxl111sf_demod_config *cfg)
 583 {
 584         struct mxl111sf_demod_state *state = NULL;
 585
 586         mxl_dbg("()");
 587
 588         state = kzalloc(sizeof(struct mxl111sf_demod_state), GFP_KERNEL);
 589         if (state == NULL)
 590                 return NULL;
 591
 592         state->mxl_state = mxl_state;
 593         state->cfg = cfg;
 594
 595         memcpy(&state->fe.ops, &mxl111sf_demod_ops,
 596                sizeof(struct dvb_frontend_ops));
 597
 598         state->fe.demodulator_priv = state;
 599         return &state->fe;
 600 }
 601 EXPORT_SYMBOL_GPL(mxl111sf_demod_attach);
 602
 603 MODULE_DESCRIPTION("MaxLinear MxL111SF DVB-T demodulator driver");
 604 MODULE_AUTHOR("Michael Krufky <mkrufky@kernellabs.com>");
 605 MODULE_LICENSE("GPL");
 606 MODULE_VERSION("0.1");
 607
 608 /*
 609  * Local variables:
 610  * c-basic-offset: 8
 611  * End:
 612  */