1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 NxtWave Communications - NXT6000 demodulator driver 4 5 Copyright (C) 2002-2003 Florian Schirmer <jolt@tuxbox.org> 6 Copyright (C) 2003 Paul Andreassen <paul@andreassen.com.au> 7 8 */ 9 10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 11 12 #include <linux/init.h> 13 #include <linux/kernel.h> 14 #include <linux/module.h> 15 #include <linux/string.h> 16 #include <linux/slab.h> 17 18 #include <media/dvb_frontend.h> 19 #include "nxt6000_priv.h" 20 #include "nxt6000.h" 21 22 23 24 struct nxt6000_state { 25 struct i2c_adapter* i2c; 26 /* configuration settings */ 27 const struct nxt6000_config* config; 28 struct dvb_frontend frontend; 29 }; 30 31 static int debug; 32 #define dprintk(fmt, arg...) do { \ 33 if (debug) \ 34 printk(KERN_DEBUG pr_fmt("%s: " fmt), \ 35 __func__, ##arg); \ 36 } while (0) 37 38 static int nxt6000_writereg(struct nxt6000_state* state, u8 reg, u8 data) 39 { 40 u8 buf[] = { reg, data }; 41 struct i2c_msg msg = {.addr = state->config->demod_address,.flags = 0,.buf = buf,.len = 2 }; 42 int ret; 43 44 if ((ret = i2c_transfer(state->i2c, &msg, 1)) != 1) 45 dprintk("nxt6000: nxt6000_write error (reg: 0x%02X, data: 0x%02X, ret: %d)\n", reg, data, ret); 46 47 return (ret != 1) ? -EIO : 0; 48 } 49 50 static u8 nxt6000_readreg(struct nxt6000_state* state, u8 reg) 51 { 52 int ret; 53 u8 b0[] = { reg }; 54 u8 b1[] = { 0 }; 55 struct i2c_msg msgs[] = { 56 {.addr = state->config->demod_address,.flags = 0,.buf = b0,.len = 1}, 57 {.addr = state->config->demod_address,.flags = I2C_M_RD,.buf = b1,.len = 1} 58 }; 59 60 ret = i2c_transfer(state->i2c, msgs, 2); 61 62 if (ret != 2) 63 dprintk("nxt6000: nxt6000_read error (reg: 0x%02X, ret: %d)\n", reg, ret); 64 65 return b1[0]; 66 } 67 68 static void nxt6000_reset(struct nxt6000_state* state) 69 { 70 u8 val; 71 72 val = nxt6000_readreg(state, OFDM_COR_CTL); 73 74 nxt6000_writereg(state, OFDM_COR_CTL, val & ~COREACT); 75 nxt6000_writereg(state, OFDM_COR_CTL, val | COREACT); 76 } 77 78 static int nxt6000_set_bandwidth(struct nxt6000_state *state, u32 bandwidth) 79 { 80 u16 nominal_rate; 81 int result; 82 83 switch (bandwidth) { 84 case 6000000: 85 nominal_rate = 0x55B7; 86 break; 87 88 case 7000000: 89 nominal_rate = 0x6400; 90 break; 91 92 case 8000000: 93 nominal_rate = 0x7249; 94 break; 95 96 default: 97 return -EINVAL; 98 } 99 100 if ((result = nxt6000_writereg(state, OFDM_TRL_NOMINALRATE_1, nominal_rate & 0xFF)) < 0) 101 return result; 102 103 return nxt6000_writereg(state, OFDM_TRL_NOMINALRATE_2, (nominal_rate >> 8) & 0xFF); 104 } 105 106 static int nxt6000_set_guard_interval(struct nxt6000_state *state, 107 enum fe_guard_interval guard_interval) 108 { 109 switch (guard_interval) { 110 111 case GUARD_INTERVAL_1_32: 112 return nxt6000_writereg(state, OFDM_COR_MODEGUARD, 0x00 | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x03)); 113 114 case GUARD_INTERVAL_1_16: 115 return nxt6000_writereg(state, OFDM_COR_MODEGUARD, 0x01 | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x03)); 116 117 case GUARD_INTERVAL_AUTO: 118 case GUARD_INTERVAL_1_8: 119 return nxt6000_writereg(state, OFDM_COR_MODEGUARD, 0x02 | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x03)); 120 121 case GUARD_INTERVAL_1_4: 122 return nxt6000_writereg(state, OFDM_COR_MODEGUARD, 0x03 | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x03)); 123 124 default: 125 return -EINVAL; 126 } 127 } 128 129 static int nxt6000_set_inversion(struct nxt6000_state *state, 130 enum fe_spectral_inversion inversion) 131 { 132 switch (inversion) { 133 134 case INVERSION_OFF: 135 return nxt6000_writereg(state, OFDM_ITB_CTL, 0x00); 136 137 case INVERSION_ON: 138 return nxt6000_writereg(state, OFDM_ITB_CTL, ITBINV); 139 140 default: 141 return -EINVAL; 142 143 } 144 } 145 146 static int 147 nxt6000_set_transmission_mode(struct nxt6000_state *state, 148 enum fe_transmit_mode transmission_mode) 149 { 150 int result; 151 152 switch (transmission_mode) { 153 154 case TRANSMISSION_MODE_2K: 155 if ((result = nxt6000_writereg(state, EN_DMD_RACQ, 0x00 | (nxt6000_readreg(state, EN_DMD_RACQ) & ~0x03))) < 0) 156 return result; 157 158 return nxt6000_writereg(state, OFDM_COR_MODEGUARD, (0x00 << 2) | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x04)); 159 160 case TRANSMISSION_MODE_8K: 161 case TRANSMISSION_MODE_AUTO: 162 if ((result = nxt6000_writereg(state, EN_DMD_RACQ, 0x02 | (nxt6000_readreg(state, EN_DMD_RACQ) & ~0x03))) < 0) 163 return result; 164 165 return nxt6000_writereg(state, OFDM_COR_MODEGUARD, (0x01 << 2) | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x04)); 166 167 default: 168 return -EINVAL; 169 170 } 171 } 172 173 static void nxt6000_setup(struct dvb_frontend* fe) 174 { 175 struct nxt6000_state* state = fe->demodulator_priv; 176 177 nxt6000_writereg(state, RS_COR_SYNC_PARAM, SYNC_PARAM); 178 nxt6000_writereg(state, BER_CTRL, /*(1 << 2) | */ (0x01 << 1) | 0x01); 179 nxt6000_writereg(state, VIT_BERTIME_2, 0x00); // BER Timer = 0x000200 * 256 = 131072 bits 180 nxt6000_writereg(state, VIT_BERTIME_1, 0x02); // 181 nxt6000_writereg(state, VIT_BERTIME_0, 0x00); // 182 nxt6000_writereg(state, VIT_COR_INTEN, 0x98); // Enable BER interrupts 183 nxt6000_writereg(state, VIT_COR_CTL, 0x82); // Enable BER measurement 184 nxt6000_writereg(state, VIT_COR_CTL, VIT_COR_RESYNC | 0x02 ); 185 nxt6000_writereg(state, OFDM_COR_CTL, (0x01 << 5) | (nxt6000_readreg(state, OFDM_COR_CTL) & 0x0F)); 186 nxt6000_writereg(state, OFDM_COR_MODEGUARD, FORCEMODE8K | 0x02); 187 nxt6000_writereg(state, OFDM_AGC_CTL, AGCLAST | INITIAL_AGC_BW); 188 nxt6000_writereg(state, OFDM_ITB_FREQ_1, 0x06); 189 nxt6000_writereg(state, OFDM_ITB_FREQ_2, 0x31); 190 nxt6000_writereg(state, OFDM_CAS_CTL, (0x01 << 7) | (0x02 << 3) | 0x04); 191 nxt6000_writereg(state, CAS_FREQ, 0xBB); /* CHECKME */ 192 nxt6000_writereg(state, OFDM_SYR_CTL, 1 << 2); 193 nxt6000_writereg(state, OFDM_PPM_CTL_1, PPM256); 194 nxt6000_writereg(state, OFDM_TRL_NOMINALRATE_1, 0x49); 195 nxt6000_writereg(state, OFDM_TRL_NOMINALRATE_2, 0x72); 196 nxt6000_writereg(state, ANALOG_CONTROL_0, 1 << 5); 197 nxt6000_writereg(state, EN_DMD_RACQ, (1 << 7) | (3 << 4) | 2); 198 nxt6000_writereg(state, DIAG_CONFIG, TB_SET); 199 200 if (state->config->clock_inversion) 201 nxt6000_writereg(state, SUB_DIAG_MODE_SEL, CLKINVERSION); 202 else 203 nxt6000_writereg(state, SUB_DIAG_MODE_SEL, 0); 204 205 nxt6000_writereg(state, TS_FORMAT, 0); 206 } 207 208 static void nxt6000_dump_status(struct nxt6000_state *state) 209 { 210 u8 val; 211 212 #if 0 213 pr_info("RS_COR_STAT: 0x%02X\n", 214 nxt6000_readreg(fe, RS_COR_STAT)); 215 pr_info("VIT_SYNC_STATUS: 0x%02X\n", 216 nxt6000_readreg(fe, VIT_SYNC_STATUS)); 217 pr_info("OFDM_COR_STAT: 0x%02X\n", 218 nxt6000_readreg(fe, OFDM_COR_STAT)); 219 pr_info("OFDM_SYR_STAT: 0x%02X\n", 220 nxt6000_readreg(fe, OFDM_SYR_STAT)); 221 pr_info("OFDM_TPS_RCVD_1: 0x%02X\n", 222 nxt6000_readreg(fe, OFDM_TPS_RCVD_1)); 223 pr_info("OFDM_TPS_RCVD_2: 0x%02X\n", 224 nxt6000_readreg(fe, OFDM_TPS_RCVD_2)); 225 pr_info("OFDM_TPS_RCVD_3: 0x%02X\n", 226 nxt6000_readreg(fe, OFDM_TPS_RCVD_3)); 227 pr_info("OFDM_TPS_RCVD_4: 0x%02X\n", 228 nxt6000_readreg(fe, OFDM_TPS_RCVD_4)); 229 pr_info("OFDM_TPS_RESERVED_1: 0x%02X\n", 230 nxt6000_readreg(fe, OFDM_TPS_RESERVED_1)); 231 pr_info("OFDM_TPS_RESERVED_2: 0x%02X\n", 232 nxt6000_readreg(fe, OFDM_TPS_RESERVED_2)); 233 #endif 234 pr_info("NXT6000 status:"); 235 236 val = nxt6000_readreg(state, RS_COR_STAT); 237 238 pr_cont(" DATA DESCR LOCK: %d,", val & 0x01); 239 pr_cont(" DATA SYNC LOCK: %d,", (val >> 1) & 0x01); 240 241 val = nxt6000_readreg(state, VIT_SYNC_STATUS); 242 243 pr_cont(" VITERBI LOCK: %d,", (val >> 7) & 0x01); 244 245 switch ((val >> 4) & 0x07) { 246 247 case 0x00: 248 pr_cont(" VITERBI CODERATE: 1/2,"); 249 break; 250 251 case 0x01: 252 pr_cont(" VITERBI CODERATE: 2/3,"); 253 break; 254 255 case 0x02: 256 pr_cont(" VITERBI CODERATE: 3/4,"); 257 break; 258 259 case 0x03: 260 pr_cont(" VITERBI CODERATE: 5/6,"); 261 break; 262 263 case 0x04: 264 pr_cont(" VITERBI CODERATE: 7/8,"); 265 break; 266 267 default: 268 pr_cont(" VITERBI CODERATE: Reserved,"); 269 270 } 271 272 val = nxt6000_readreg(state, OFDM_COR_STAT); 273 274 pr_cont(" CHCTrack: %d,", (val >> 7) & 0x01); 275 pr_cont(" TPSLock: %d,", (val >> 6) & 0x01); 276 pr_cont(" SYRLock: %d,", (val >> 5) & 0x01); 277 pr_cont(" AGCLock: %d,", (val >> 4) & 0x01); 278 279 switch (val & 0x0F) { 280 281 case 0x00: 282 pr_cont(" CoreState: IDLE,"); 283 break; 284 285 case 0x02: 286 pr_cont(" CoreState: WAIT_AGC,"); 287 break; 288 289 case 0x03: 290 pr_cont(" CoreState: WAIT_SYR,"); 291 break; 292 293 case 0x04: 294 pr_cont(" CoreState: WAIT_PPM,"); 295 break; 296 297 case 0x01: 298 pr_cont(" CoreState: WAIT_TRL,"); 299 break; 300 301 case 0x05: 302 pr_cont(" CoreState: WAIT_TPS,"); 303 break; 304 305 case 0x06: 306 pr_cont(" CoreState: MONITOR_TPS,"); 307 break; 308 309 default: 310 pr_cont(" CoreState: Reserved,"); 311 312 } 313 314 val = nxt6000_readreg(state, OFDM_SYR_STAT); 315 316 pr_cont(" SYRLock: %d,", (val >> 4) & 0x01); 317 pr_cont(" SYRMode: %s,", (val >> 2) & 0x01 ? "8K" : "2K"); 318 319 switch ((val >> 4) & 0x03) { 320 321 case 0x00: 322 pr_cont(" SYRGuard: 1/32,"); 323 break; 324 325 case 0x01: 326 pr_cont(" SYRGuard: 1/16,"); 327 break; 328 329 case 0x02: 330 pr_cont(" SYRGuard: 1/8,"); 331 break; 332 333 case 0x03: 334 pr_cont(" SYRGuard: 1/4,"); 335 break; 336 } 337 338 val = nxt6000_readreg(state, OFDM_TPS_RCVD_3); 339 340 switch ((val >> 4) & 0x07) { 341 342 case 0x00: 343 pr_cont(" TPSLP: 1/2,"); 344 break; 345 346 case 0x01: 347 pr_cont(" TPSLP: 2/3,"); 348 break; 349 350 case 0x02: 351 pr_cont(" TPSLP: 3/4,"); 352 break; 353 354 case 0x03: 355 pr_cont(" TPSLP: 5/6,"); 356 break; 357 358 case 0x04: 359 pr_cont(" TPSLP: 7/8,"); 360 break; 361 362 default: 363 pr_cont(" TPSLP: Reserved,"); 364 365 } 366 367 switch (val & 0x07) { 368 369 case 0x00: 370 pr_cont(" TPSHP: 1/2,"); 371 break; 372 373 case 0x01: 374 pr_cont(" TPSHP: 2/3,"); 375 break; 376 377 case 0x02: 378 pr_cont(" TPSHP: 3/4,"); 379 break; 380 381 case 0x03: 382 pr_cont(" TPSHP: 5/6,"); 383 break; 384 385 case 0x04: 386 pr_cont(" TPSHP: 7/8,"); 387 break; 388 389 default: 390 pr_cont(" TPSHP: Reserved,"); 391 392 } 393 394 val = nxt6000_readreg(state, OFDM_TPS_RCVD_4); 395 396 pr_cont(" TPSMode: %s,", val & 0x01 ? "8K" : "2K"); 397 398 switch ((val >> 4) & 0x03) { 399 400 case 0x00: 401 pr_cont(" TPSGuard: 1/32,"); 402 break; 403 404 case 0x01: 405 pr_cont(" TPSGuard: 1/16,"); 406 break; 407 408 case 0x02: 409 pr_cont(" TPSGuard: 1/8,"); 410 break; 411 412 case 0x03: 413 pr_cont(" TPSGuard: 1/4,"); 414 break; 415 416 } 417 418 /* Strange magic required to gain access to RF_AGC_STATUS */ 419 nxt6000_readreg(state, RF_AGC_VAL_1); 420 val = nxt6000_readreg(state, RF_AGC_STATUS); 421 val = nxt6000_readreg(state, RF_AGC_STATUS); 422 423 pr_cont(" RF AGC LOCK: %d,", (val >> 4) & 0x01); 424 pr_cont("\n"); 425 } 426 427 static int nxt6000_read_status(struct dvb_frontend *fe, enum fe_status *status) 428 { 429 u8 core_status; 430 struct nxt6000_state* state = fe->demodulator_priv; 431 432 *status = 0; 433 434 core_status = nxt6000_readreg(state, OFDM_COR_STAT); 435 436 if (core_status & AGCLOCKED) 437 *status |= FE_HAS_SIGNAL; 438 439 if (nxt6000_readreg(state, OFDM_SYR_STAT) & GI14_SYR_LOCK) 440 *status |= FE_HAS_CARRIER; 441 442 if (nxt6000_readreg(state, VIT_SYNC_STATUS) & VITINSYNC) 443 *status |= FE_HAS_VITERBI; 444 445 if (nxt6000_readreg(state, RS_COR_STAT) & RSCORESTATUS) 446 *status |= FE_HAS_SYNC; 447 448 if ((core_status & TPSLOCKED) && (*status == (FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC))) 449 *status |= FE_HAS_LOCK; 450 451 if (debug) 452 nxt6000_dump_status(state); 453 454 return 0; 455 } 456 457 static int nxt6000_init(struct dvb_frontend* fe) 458 { 459 struct nxt6000_state* state = fe->demodulator_priv; 460 461 nxt6000_reset(state); 462 nxt6000_setup(fe); 463 464 return 0; 465 } 466 467 static int nxt6000_set_frontend(struct dvb_frontend *fe) 468 { 469 struct dtv_frontend_properties *p = &fe->dtv_property_cache; 470 struct nxt6000_state* state = fe->demodulator_priv; 471 int result; 472 473 if (fe->ops.tuner_ops.set_params) { 474 fe->ops.tuner_ops.set_params(fe); 475 if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0); 476 } 477 478 result = nxt6000_set_bandwidth(state, p->bandwidth_hz); 479 if (result < 0) 480 return result; 481 482 result = nxt6000_set_guard_interval(state, p->guard_interval); 483 if (result < 0) 484 return result; 485 486 result = nxt6000_set_transmission_mode(state, p->transmission_mode); 487 if (result < 0) 488 return result; 489 490 result = nxt6000_set_inversion(state, p->inversion); 491 if (result < 0) 492 return result; 493 494 msleep(500); 495 return 0; 496 } 497 498 static void nxt6000_release(struct dvb_frontend* fe) 499 { 500 struct nxt6000_state* state = fe->demodulator_priv; 501 kfree(state); 502 } 503 504 static int nxt6000_read_snr(struct dvb_frontend* fe, u16* snr) 505 { 506 struct nxt6000_state* state = fe->demodulator_priv; 507 508 *snr = nxt6000_readreg( state, OFDM_CHC_SNR) / 8; 509 510 return 0; 511 } 512 513 static int nxt6000_read_ber(struct dvb_frontend* fe, u32* ber) 514 { 515 struct nxt6000_state* state = fe->demodulator_priv; 516 517 nxt6000_writereg( state, VIT_COR_INTSTAT, 0x18 ); 518 519 *ber = (nxt6000_readreg( state, VIT_BER_1 ) << 8 ) | 520 nxt6000_readreg( state, VIT_BER_0 ); 521 522 nxt6000_writereg( state, VIT_COR_INTSTAT, 0x18); // Clear BER Done interrupts 523 524 return 0; 525 } 526 527 static int nxt6000_read_signal_strength(struct dvb_frontend* fe, u16* signal_strength) 528 { 529 struct nxt6000_state* state = fe->demodulator_priv; 530 531 *signal_strength = (short) (511 - 532 (nxt6000_readreg(state, AGC_GAIN_1) + 533 ((nxt6000_readreg(state, AGC_GAIN_2) & 0x03) << 8))); 534 535 return 0; 536 } 537 538 static int nxt6000_fe_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune) 539 { 540 tune->min_delay_ms = 500; 541 return 0; 542 } 543 544 static int nxt6000_i2c_gate_ctrl(struct dvb_frontend* fe, int enable) 545 { 546 struct nxt6000_state* state = fe->demodulator_priv; 547 548 if (enable) { 549 return nxt6000_writereg(state, ENABLE_TUNER_IIC, 0x01); 550 } else { 551 return nxt6000_writereg(state, ENABLE_TUNER_IIC, 0x00); 552 } 553 } 554 555 static const struct dvb_frontend_ops nxt6000_ops; 556 557 struct dvb_frontend* nxt6000_attach(const struct nxt6000_config* config, 558 struct i2c_adapter* i2c) 559 { 560 struct nxt6000_state* state = NULL; 561 562 /* allocate memory for the internal state */ 563 state = kzalloc(sizeof(struct nxt6000_state), GFP_KERNEL); 564 if (state == NULL) goto error; 565 566 /* setup the state */ 567 state->config = config; 568 state->i2c = i2c; 569 570 /* check if the demod is there */ 571 if (nxt6000_readreg(state, OFDM_MSC_REV) != NXT6000ASICDEVICE) goto error; 572 573 /* create dvb_frontend */ 574 memcpy(&state->frontend.ops, &nxt6000_ops, sizeof(struct dvb_frontend_ops)); 575 state->frontend.demodulator_priv = state; 576 return &state->frontend; 577 578 error: 579 kfree(state); 580 return NULL; 581 } 582 583 static const struct dvb_frontend_ops nxt6000_ops = { 584 .delsys = { SYS_DVBT }, 585 .info = { 586 .name = "NxtWave NXT6000 DVB-T", 587 .frequency_min_hz = 0, 588 .frequency_max_hz = 863250 * kHz, 589 .frequency_stepsize_hz = 62500, 590 /*.frequency_tolerance = *//* FIXME: 12% of SR */ 591 .symbol_rate_min = 0, /* FIXME */ 592 .symbol_rate_max = 9360000, /* FIXME */ 593 .symbol_rate_tolerance = 4000, 594 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 | 595 FE_CAN_FEC_4_5 | FE_CAN_FEC_5_6 | FE_CAN_FEC_6_7 | 596 FE_CAN_FEC_7_8 | FE_CAN_FEC_8_9 | FE_CAN_FEC_AUTO | 597 FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO | 598 FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_GUARD_INTERVAL_AUTO | 599 FE_CAN_HIERARCHY_AUTO, 600 }, 601 602 .release = nxt6000_release, 603 604 .init = nxt6000_init, 605 .i2c_gate_ctrl = nxt6000_i2c_gate_ctrl, 606 607 .get_tune_settings = nxt6000_fe_get_tune_settings, 608 609 .set_frontend = nxt6000_set_frontend, 610 611 .read_status = nxt6000_read_status, 612 .read_ber = nxt6000_read_ber, 613 .read_signal_strength = nxt6000_read_signal_strength, 614 .read_snr = nxt6000_read_snr, 615 }; 616 617 module_param(debug, int, 0644); 618 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off)."); 619 620 MODULE_DESCRIPTION("NxtWave NXT6000 DVB-T demodulator driver"); 621 MODULE_AUTHOR("Florian Schirmer"); 622 MODULE_LICENSE("GPL"); 623 624 EXPORT_SYMBOL(nxt6000_attach); 625