1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Driver for Zarlink DVB-T MT352 demodulator 4 * 5 * Written by Holger Waechtler <holger@qanu.de> 6 * and Daniel Mack <daniel@qanu.de> 7 * 8 * AVerMedia AVerTV DVB-T 771 support by 9 * Wolfram Joost <dbox2@frokaschwei.de> 10 * 11 * Support for Samsung TDTC9251DH01C(M) tuner 12 * Copyright (C) 2004 Antonio Mancuso <antonio.mancuso@digitaltelevision.it> 13 * Amauri Celani <acelani@essegi.net> 14 * 15 * DVICO FusionHDTV DVB-T1 and DVICO FusionHDTV DVB-T Lite support by 16 * Christopher Pascoe <c.pascoe@itee.uq.edu.au> 17 */ 18 19 #include <linux/kernel.h> 20 #include <linux/module.h> 21 #include <linux/init.h> 22 #include <linux/delay.h> 23 #include <linux/string.h> 24 #include <linux/slab.h> 25 26 #include <media/dvb_frontend.h> 27 #include "mt352_priv.h" 28 #include "mt352.h" 29 30 struct mt352_state { 31 struct i2c_adapter* i2c; 32 struct dvb_frontend frontend; 33 34 /* configuration settings */ 35 struct mt352_config config; 36 }; 37 38 static int debug; 39 #define dprintk(args...) \ 40 do { \ 41 if (debug) printk(KERN_DEBUG "mt352: " args); \ 42 } while (0) 43 44 static int mt352_single_write(struct dvb_frontend *fe, u8 reg, u8 val) 45 { 46 struct mt352_state* state = fe->demodulator_priv; 47 u8 buf[2] = { reg, val }; 48 struct i2c_msg msg = { .addr = state->config.demod_address, .flags = 0, 49 .buf = buf, .len = 2 }; 50 int err = i2c_transfer(state->i2c, &msg, 1); 51 if (err != 1) { 52 printk("mt352_write() to reg %x failed (err = %d)!\n", reg, err); 53 return err; 54 } 55 return 0; 56 } 57 58 static int _mt352_write(struct dvb_frontend* fe, const u8 ibuf[], int ilen) 59 { 60 int err,i; 61 for (i=0; i < ilen-1; i++) 62 if ((err = mt352_single_write(fe,ibuf[0]+i,ibuf[i+1]))) 63 return err; 64 65 return 0; 66 } 67 68 static int mt352_read_register(struct mt352_state* state, u8 reg) 69 { 70 int ret; 71 u8 b0 [] = { reg }; 72 u8 b1 [] = { 0 }; 73 struct i2c_msg msg [] = { { .addr = state->config.demod_address, 74 .flags = 0, 75 .buf = b0, .len = 1 }, 76 { .addr = state->config.demod_address, 77 .flags = I2C_M_RD, 78 .buf = b1, .len = 1 } }; 79 80 ret = i2c_transfer(state->i2c, msg, 2); 81 82 if (ret != 2) { 83 printk("%s: readreg error (reg=%d, ret==%i)\n", 84 __func__, reg, ret); 85 return ret; 86 } 87 88 return b1[0]; 89 } 90 91 static int mt352_sleep(struct dvb_frontend* fe) 92 { 93 static u8 mt352_softdown[] = { CLOCK_CTL, 0x20, 0x08 }; 94 95 _mt352_write(fe, mt352_softdown, sizeof(mt352_softdown)); 96 return 0; 97 } 98 99 static void mt352_calc_nominal_rate(struct mt352_state* state, 100 u32 bandwidth, 101 unsigned char *buf) 102 { 103 u32 adc_clock = 20480; /* 20.340 MHz */ 104 u32 bw,value; 105 106 switch (bandwidth) { 107 case 6000000: 108 bw = 6; 109 break; 110 case 7000000: 111 bw = 7; 112 break; 113 case 8000000: 114 default: 115 bw = 8; 116 break; 117 } 118 if (state->config.adc_clock) 119 adc_clock = state->config.adc_clock; 120 121 value = 64 * bw * (1<<16) / (7 * 8); 122 value = value * 1000 / adc_clock; 123 dprintk("%s: bw %d, adc_clock %d => 0x%x\n", 124 __func__, bw, adc_clock, value); 125 buf[0] = msb(value); 126 buf[1] = lsb(value); 127 } 128 129 static void mt352_calc_input_freq(struct mt352_state* state, 130 unsigned char *buf) 131 { 132 int adc_clock = 20480; /* 20.480000 MHz */ 133 int if2 = 36167; /* 36.166667 MHz */ 134 int ife,value; 135 136 if (state->config.adc_clock) 137 adc_clock = state->config.adc_clock; 138 if (state->config.if2) 139 if2 = state->config.if2; 140 141 if (adc_clock >= if2 * 2) 142 ife = if2; 143 else { 144 ife = adc_clock - (if2 % adc_clock); 145 if (ife > adc_clock / 2) 146 ife = adc_clock - ife; 147 } 148 value = -16374 * ife / adc_clock; 149 dprintk("%s: if2 %d, ife %d, adc_clock %d => %d / 0x%x\n", 150 __func__, if2, ife, adc_clock, value, value & 0x3fff); 151 buf[0] = msb(value); 152 buf[1] = lsb(value); 153 } 154 155 static int mt352_set_parameters(struct dvb_frontend *fe) 156 { 157 struct dtv_frontend_properties *op = &fe->dtv_property_cache; 158 struct mt352_state* state = fe->demodulator_priv; 159 unsigned char buf[13]; 160 static unsigned char tuner_go[] = { 0x5d, 0x01 }; 161 static unsigned char fsm_go[] = { 0x5e, 0x01 }; 162 unsigned int tps = 0; 163 164 switch (op->code_rate_HP) { 165 case FEC_2_3: 166 tps |= (1 << 7); 167 break; 168 case FEC_3_4: 169 tps |= (2 << 7); 170 break; 171 case FEC_5_6: 172 tps |= (3 << 7); 173 break; 174 case FEC_7_8: 175 tps |= (4 << 7); 176 break; 177 case FEC_1_2: 178 case FEC_AUTO: 179 break; 180 default: 181 return -EINVAL; 182 } 183 184 switch (op->code_rate_LP) { 185 case FEC_2_3: 186 tps |= (1 << 4); 187 break; 188 case FEC_3_4: 189 tps |= (2 << 4); 190 break; 191 case FEC_5_6: 192 tps |= (3 << 4); 193 break; 194 case FEC_7_8: 195 tps |= (4 << 4); 196 break; 197 case FEC_1_2: 198 case FEC_AUTO: 199 break; 200 case FEC_NONE: 201 if (op->hierarchy == HIERARCHY_AUTO || 202 op->hierarchy == HIERARCHY_NONE) 203 break; 204 fallthrough; 205 default: 206 return -EINVAL; 207 } 208 209 switch (op->modulation) { 210 case QPSK: 211 break; 212 case QAM_AUTO: 213 case QAM_16: 214 tps |= (1 << 13); 215 break; 216 case QAM_64: 217 tps |= (2 << 13); 218 break; 219 default: 220 return -EINVAL; 221 } 222 223 switch (op->transmission_mode) { 224 case TRANSMISSION_MODE_2K: 225 case TRANSMISSION_MODE_AUTO: 226 break; 227 case TRANSMISSION_MODE_8K: 228 tps |= (1 << 0); 229 break; 230 default: 231 return -EINVAL; 232 } 233 234 switch (op->guard_interval) { 235 case GUARD_INTERVAL_1_32: 236 case GUARD_INTERVAL_AUTO: 237 break; 238 case GUARD_INTERVAL_1_16: 239 tps |= (1 << 2); 240 break; 241 case GUARD_INTERVAL_1_8: 242 tps |= (2 << 2); 243 break; 244 case GUARD_INTERVAL_1_4: 245 tps |= (3 << 2); 246 break; 247 default: 248 return -EINVAL; 249 } 250 251 switch (op->hierarchy) { 252 case HIERARCHY_AUTO: 253 case HIERARCHY_NONE: 254 break; 255 case HIERARCHY_1: 256 tps |= (1 << 10); 257 break; 258 case HIERARCHY_2: 259 tps |= (2 << 10); 260 break; 261 case HIERARCHY_4: 262 tps |= (3 << 10); 263 break; 264 default: 265 return -EINVAL; 266 } 267 268 269 buf[0] = TPS_GIVEN_1; /* TPS_GIVEN_1 and following registers */ 270 271 buf[1] = msb(tps); /* TPS_GIVEN_(1|0) */ 272 buf[2] = lsb(tps); 273 274 buf[3] = 0x50; // old 275 // buf[3] = 0xf4; // pinnacle 276 277 mt352_calc_nominal_rate(state, op->bandwidth_hz, buf+4); 278 mt352_calc_input_freq(state, buf+6); 279 280 if (state->config.no_tuner) { 281 if (fe->ops.tuner_ops.set_params) { 282 fe->ops.tuner_ops.set_params(fe); 283 if (fe->ops.i2c_gate_ctrl) 284 fe->ops.i2c_gate_ctrl(fe, 0); 285 } 286 287 _mt352_write(fe, buf, 8); 288 _mt352_write(fe, fsm_go, 2); 289 } else { 290 if (fe->ops.tuner_ops.calc_regs) { 291 fe->ops.tuner_ops.calc_regs(fe, buf+8, 5); 292 buf[8] <<= 1; 293 _mt352_write(fe, buf, sizeof(buf)); 294 _mt352_write(fe, tuner_go, 2); 295 } 296 } 297 298 return 0; 299 } 300 301 static int mt352_get_parameters(struct dvb_frontend* fe, 302 struct dtv_frontend_properties *op) 303 { 304 struct mt352_state* state = fe->demodulator_priv; 305 u16 tps; 306 u16 div; 307 u8 trl; 308 static const u8 tps_fec_to_api[8] = 309 { 310 FEC_1_2, 311 FEC_2_3, 312 FEC_3_4, 313 FEC_5_6, 314 FEC_7_8, 315 FEC_AUTO, 316 FEC_AUTO, 317 FEC_AUTO 318 }; 319 320 if ( (mt352_read_register(state,0x00) & 0xC0) != 0xC0 ) 321 return -EINVAL; 322 323 /* Use TPS_RECEIVED-registers, not the TPS_CURRENT-registers because 324 * the mt352 sometimes works with the wrong parameters 325 */ 326 tps = (mt352_read_register(state, TPS_RECEIVED_1) << 8) | mt352_read_register(state, TPS_RECEIVED_0); 327 div = (mt352_read_register(state, CHAN_START_1) << 8) | mt352_read_register(state, CHAN_START_0); 328 trl = mt352_read_register(state, TRL_NOMINAL_RATE_1); 329 330 op->code_rate_HP = tps_fec_to_api[(tps >> 7) & 7]; 331 op->code_rate_LP = tps_fec_to_api[(tps >> 4) & 7]; 332 333 switch ( (tps >> 13) & 3) 334 { 335 case 0: 336 op->modulation = QPSK; 337 break; 338 case 1: 339 op->modulation = QAM_16; 340 break; 341 case 2: 342 op->modulation = QAM_64; 343 break; 344 default: 345 op->modulation = QAM_AUTO; 346 break; 347 } 348 349 op->transmission_mode = (tps & 0x01) ? TRANSMISSION_MODE_8K : TRANSMISSION_MODE_2K; 350 351 switch ( (tps >> 2) & 3) 352 { 353 case 0: 354 op->guard_interval = GUARD_INTERVAL_1_32; 355 break; 356 case 1: 357 op->guard_interval = GUARD_INTERVAL_1_16; 358 break; 359 case 2: 360 op->guard_interval = GUARD_INTERVAL_1_8; 361 break; 362 case 3: 363 op->guard_interval = GUARD_INTERVAL_1_4; 364 break; 365 default: 366 op->guard_interval = GUARD_INTERVAL_AUTO; 367 break; 368 } 369 370 switch ( (tps >> 10) & 7) 371 { 372 case 0: 373 op->hierarchy = HIERARCHY_NONE; 374 break; 375 case 1: 376 op->hierarchy = HIERARCHY_1; 377 break; 378 case 2: 379 op->hierarchy = HIERARCHY_2; 380 break; 381 case 3: 382 op->hierarchy = HIERARCHY_4; 383 break; 384 default: 385 op->hierarchy = HIERARCHY_AUTO; 386 break; 387 } 388 389 op->frequency = (500 * (div - IF_FREQUENCYx6)) / 3 * 1000; 390 391 if (trl == 0x72) 392 op->bandwidth_hz = 8000000; 393 else if (trl == 0x64) 394 op->bandwidth_hz = 7000000; 395 else 396 op->bandwidth_hz = 6000000; 397 398 399 if (mt352_read_register(state, STATUS_2) & 0x02) 400 op->inversion = INVERSION_OFF; 401 else 402 op->inversion = INVERSION_ON; 403 404 return 0; 405 } 406 407 static int mt352_read_status(struct dvb_frontend *fe, enum fe_status *status) 408 { 409 struct mt352_state* state = fe->demodulator_priv; 410 int s0, s1, s3; 411 412 /* FIXME: 413 * 414 * The MT352 design manual from Zarlink states (page 46-47): 415 * 416 * Notes about the TUNER_GO register: 417 * 418 * If the Read_Tuner_Byte (bit-1) is activated, then the tuner status 419 * byte is copied from the tuner to the STATUS_3 register and 420 * completion of the read operation is indicated by bit-5 of the 421 * INTERRUPT_3 register. 422 */ 423 424 if ((s0 = mt352_read_register(state, STATUS_0)) < 0) 425 return -EREMOTEIO; 426 if ((s1 = mt352_read_register(state, STATUS_1)) < 0) 427 return -EREMOTEIO; 428 if ((s3 = mt352_read_register(state, STATUS_3)) < 0) 429 return -EREMOTEIO; 430 431 *status = 0; 432 if (s0 & (1 << 4)) 433 *status |= FE_HAS_CARRIER; 434 if (s0 & (1 << 1)) 435 *status |= FE_HAS_VITERBI; 436 if (s0 & (1 << 5)) 437 *status |= FE_HAS_LOCK; 438 if (s1 & (1 << 1)) 439 *status |= FE_HAS_SYNC; 440 if (s3 & (1 << 6)) 441 *status |= FE_HAS_SIGNAL; 442 443 if ((*status & (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC)) != 444 (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC)) 445 *status &= ~FE_HAS_LOCK; 446 447 return 0; 448 } 449 450 static int mt352_read_ber(struct dvb_frontend* fe, u32* ber) 451 { 452 struct mt352_state* state = fe->demodulator_priv; 453 454 *ber = (mt352_read_register (state, RS_ERR_CNT_2) << 16) | 455 (mt352_read_register (state, RS_ERR_CNT_1) << 8) | 456 (mt352_read_register (state, RS_ERR_CNT_0)); 457 458 return 0; 459 } 460 461 static int mt352_read_signal_strength(struct dvb_frontend* fe, u16* strength) 462 { 463 struct mt352_state* state = fe->demodulator_priv; 464 465 /* align the 12 bit AGC gain with the most significant bits */ 466 u16 signal = ((mt352_read_register(state, AGC_GAIN_1) & 0x0f) << 12) | 467 (mt352_read_register(state, AGC_GAIN_0) << 4); 468 469 /* inverse of gain is signal strength */ 470 *strength = ~signal; 471 return 0; 472 } 473 474 static int mt352_read_snr(struct dvb_frontend* fe, u16* snr) 475 { 476 struct mt352_state* state = fe->demodulator_priv; 477 478 u8 _snr = mt352_read_register (state, SNR); 479 *snr = (_snr << 8) | _snr; 480 481 return 0; 482 } 483 484 static int mt352_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks) 485 { 486 struct mt352_state* state = fe->demodulator_priv; 487 488 *ucblocks = (mt352_read_register (state, RS_UBC_1) << 8) | 489 (mt352_read_register (state, RS_UBC_0)); 490 491 return 0; 492 } 493 494 static int mt352_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fe_tune_settings) 495 { 496 fe_tune_settings->min_delay_ms = 800; 497 fe_tune_settings->step_size = 0; 498 fe_tune_settings->max_drift = 0; 499 500 return 0; 501 } 502 503 static int mt352_init(struct dvb_frontend* fe) 504 { 505 struct mt352_state* state = fe->demodulator_priv; 506 507 static u8 mt352_reset_attach [] = { RESET, 0xC0 }; 508 509 dprintk("%s: hello\n",__func__); 510 511 if ((mt352_read_register(state, CLOCK_CTL) & 0x10) == 0 || 512 (mt352_read_register(state, CONFIG) & 0x20) == 0) { 513 514 /* Do a "hard" reset */ 515 _mt352_write(fe, mt352_reset_attach, sizeof(mt352_reset_attach)); 516 return state->config.demod_init(fe); 517 } 518 519 return 0; 520 } 521 522 static void mt352_release(struct dvb_frontend* fe) 523 { 524 struct mt352_state* state = fe->demodulator_priv; 525 kfree(state); 526 } 527 528 static const struct dvb_frontend_ops mt352_ops; 529 530 struct dvb_frontend* mt352_attach(const struct mt352_config* config, 531 struct i2c_adapter* i2c) 532 { 533 struct mt352_state* state = NULL; 534 535 /* allocate memory for the internal state */ 536 state = kzalloc(sizeof(struct mt352_state), GFP_KERNEL); 537 if (state == NULL) goto error; 538 539 /* setup the state */ 540 state->i2c = i2c; 541 memcpy(&state->config,config,sizeof(struct mt352_config)); 542 543 /* check if the demod is there */ 544 if (mt352_read_register(state, CHIP_ID) != ID_MT352) goto error; 545 546 /* create dvb_frontend */ 547 memcpy(&state->frontend.ops, &mt352_ops, sizeof(struct dvb_frontend_ops)); 548 state->frontend.demodulator_priv = state; 549 return &state->frontend; 550 551 error: 552 kfree(state); 553 return NULL; 554 } 555 556 static const struct dvb_frontend_ops mt352_ops = { 557 .delsys = { SYS_DVBT }, 558 .info = { 559 .name = "Zarlink MT352 DVB-T", 560 .frequency_min_hz = 174 * MHz, 561 .frequency_max_hz = 862 * MHz, 562 .frequency_stepsize_hz = 166667, 563 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | 564 FE_CAN_FEC_3_4 | FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | 565 FE_CAN_FEC_AUTO | 566 FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO | 567 FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_GUARD_INTERVAL_AUTO | 568 FE_CAN_HIERARCHY_AUTO | FE_CAN_RECOVER | 569 FE_CAN_MUTE_TS 570 }, 571 572 .release = mt352_release, 573 574 .init = mt352_init, 575 .sleep = mt352_sleep, 576 .write = _mt352_write, 577 578 .set_frontend = mt352_set_parameters, 579 .get_frontend = mt352_get_parameters, 580 .get_tune_settings = mt352_get_tune_settings, 581 582 .read_status = mt352_read_status, 583 .read_ber = mt352_read_ber, 584 .read_signal_strength = mt352_read_signal_strength, 585 .read_snr = mt352_read_snr, 586 .read_ucblocks = mt352_read_ucblocks, 587 }; 588 589 module_param(debug, int, 0644); 590 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off)."); 591 592 MODULE_DESCRIPTION("Zarlink MT352 DVB-T Demodulator driver"); 593 MODULE_AUTHOR("Holger Waechtler, Daniel Mack, Antonio Mancuso"); 594 MODULE_LICENSE("GPL"); 595 596 EXPORT_SYMBOL_GPL(mt352_attach); 597