1 /* 2 Driver for the Spase sp887x demodulator 3 */ 4 5 /* 6 * This driver needs external firmware. Please use the command 7 * "<kerneldir>/scripts/get_dvb_firmware sp887x" to 8 * download/extract it, and then copy it to /usr/lib/hotplug/firmware 9 * or /lib/firmware (depending on configuration of firmware hotplug). 10 */ 11 #define SP887X_DEFAULT_FIRMWARE "dvb-fe-sp887x.fw" 12 13 #include <linux/init.h> 14 #include <linux/module.h> 15 #include <linux/device.h> 16 #include <linux/firmware.h> 17 #include <linux/string.h> 18 #include <linux/slab.h> 19 20 #include <media/dvb_frontend.h> 21 #include "sp887x.h" 22 23 24 struct sp887x_state { 25 struct i2c_adapter* i2c; 26 const struct sp887x_config* config; 27 struct dvb_frontend frontend; 28 29 /* demodulator private data */ 30 u8 initialised:1; 31 }; 32 33 static int debug; 34 #define dprintk(args...) \ 35 do { \ 36 if (debug) printk(KERN_DEBUG "sp887x: " args); \ 37 } while (0) 38 39 static int i2c_writebytes (struct sp887x_state* state, u8 *buf, u8 len) 40 { 41 struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = len }; 42 int err; 43 44 if ((err = i2c_transfer (state->i2c, &msg, 1)) != 1) { 45 printk ("%s: i2c write error (addr %02x, err == %i)\n", 46 __func__, state->config->demod_address, err); 47 return -EREMOTEIO; 48 } 49 50 return 0; 51 } 52 53 static int sp887x_writereg (struct sp887x_state* state, u16 reg, u16 data) 54 { 55 u8 b0 [] = { reg >> 8 , reg & 0xff, data >> 8, data & 0xff }; 56 struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 4 }; 57 int ret; 58 59 if ((ret = i2c_transfer(state->i2c, &msg, 1)) != 1) { 60 /* 61 * in case of soft reset we ignore ACK errors... 62 */ 63 if (!(reg == 0xf1a && data == 0x000 && 64 (ret == -EREMOTEIO || ret == -EFAULT))) 65 { 66 printk("%s: writereg error (reg %03x, data %03x, ret == %i)\n", 67 __func__, reg & 0xffff, data & 0xffff, ret); 68 return ret; 69 } 70 } 71 72 return 0; 73 } 74 75 static int sp887x_readreg (struct sp887x_state* state, u16 reg) 76 { 77 u8 b0 [] = { reg >> 8 , reg & 0xff }; 78 u8 b1 [2]; 79 int ret; 80 struct i2c_msg msg[] = {{ .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 2 }, 81 { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 2 }}; 82 83 if ((ret = i2c_transfer(state->i2c, msg, 2)) != 2) { 84 printk("%s: readreg error (ret == %i)\n", __func__, ret); 85 return -1; 86 } 87 88 return (((b1[0] << 8) | b1[1]) & 0xfff); 89 } 90 91 static void sp887x_microcontroller_stop (struct sp887x_state* state) 92 { 93 dprintk("%s\n", __func__); 94 sp887x_writereg(state, 0xf08, 0x000); 95 sp887x_writereg(state, 0xf09, 0x000); 96 97 /* microcontroller STOP */ 98 sp887x_writereg(state, 0xf00, 0x000); 99 } 100 101 static void sp887x_microcontroller_start (struct sp887x_state* state) 102 { 103 dprintk("%s\n", __func__); 104 sp887x_writereg(state, 0xf08, 0x000); 105 sp887x_writereg(state, 0xf09, 0x000); 106 107 /* microcontroller START */ 108 sp887x_writereg(state, 0xf00, 0x001); 109 } 110 111 static void sp887x_setup_agc (struct sp887x_state* state) 112 { 113 /* setup AGC parameters */ 114 dprintk("%s\n", __func__); 115 sp887x_writereg(state, 0x33c, 0x054); 116 sp887x_writereg(state, 0x33b, 0x04c); 117 sp887x_writereg(state, 0x328, 0x000); 118 sp887x_writereg(state, 0x327, 0x005); 119 sp887x_writereg(state, 0x326, 0x001); 120 sp887x_writereg(state, 0x325, 0x001); 121 sp887x_writereg(state, 0x324, 0x001); 122 sp887x_writereg(state, 0x318, 0x050); 123 sp887x_writereg(state, 0x317, 0x3fe); 124 sp887x_writereg(state, 0x316, 0x001); 125 sp887x_writereg(state, 0x313, 0x005); 126 sp887x_writereg(state, 0x312, 0x002); 127 sp887x_writereg(state, 0x306, 0x000); 128 sp887x_writereg(state, 0x303, 0x000); 129 } 130 131 #define BLOCKSIZE 30 132 #define FW_SIZE 0x4000 133 /* 134 * load firmware and setup MPEG interface... 135 */ 136 static int sp887x_initial_setup (struct dvb_frontend* fe, const struct firmware *fw) 137 { 138 struct sp887x_state* state = fe->demodulator_priv; 139 u8 buf [BLOCKSIZE + 2]; 140 int i; 141 int fw_size = fw->size; 142 const unsigned char *mem = fw->data; 143 144 dprintk("%s\n", __func__); 145 146 /* ignore the first 10 bytes, then we expect 0x4000 bytes of firmware */ 147 if (fw_size < FW_SIZE + 10) 148 return -ENODEV; 149 150 mem = fw->data + 10; 151 152 /* soft reset */ 153 sp887x_writereg(state, 0xf1a, 0x000); 154 155 sp887x_microcontroller_stop (state); 156 157 printk ("%s: firmware upload... ", __func__); 158 159 /* setup write pointer to -1 (end of memory) */ 160 /* bit 0x8000 in address is set to enable 13bit mode */ 161 sp887x_writereg(state, 0x8f08, 0x1fff); 162 163 /* dummy write (wrap around to start of memory) */ 164 sp887x_writereg(state, 0x8f0a, 0x0000); 165 166 for (i = 0; i < FW_SIZE; i += BLOCKSIZE) { 167 int c = BLOCKSIZE; 168 int err; 169 170 if (c > FW_SIZE - i) 171 c = FW_SIZE - i; 172 173 /* bit 0x8000 in address is set to enable 13bit mode */ 174 /* bit 0x4000 enables multibyte read/write transfers */ 175 /* write register is 0xf0a */ 176 buf[0] = 0xcf; 177 buf[1] = 0x0a; 178 179 memcpy(&buf[2], mem + i, c); 180 181 if ((err = i2c_writebytes (state, buf, c+2)) < 0) { 182 printk ("failed.\n"); 183 printk ("%s: i2c error (err == %i)\n", __func__, err); 184 return err; 185 } 186 } 187 188 /* don't write RS bytes between packets */ 189 sp887x_writereg(state, 0xc13, 0x001); 190 191 /* suppress clock if (!data_valid) */ 192 sp887x_writereg(state, 0xc14, 0x000); 193 194 /* setup MPEG interface... */ 195 sp887x_writereg(state, 0xc1a, 0x872); 196 sp887x_writereg(state, 0xc1b, 0x001); 197 sp887x_writereg(state, 0xc1c, 0x000); /* parallel mode (serial mode == 1) */ 198 sp887x_writereg(state, 0xc1a, 0x871); 199 200 /* ADC mode, 2 for MT8872, 3 for SP8870/SP8871 */ 201 sp887x_writereg(state, 0x301, 0x002); 202 203 sp887x_setup_agc(state); 204 205 /* bit 0x010: enable data valid signal */ 206 sp887x_writereg(state, 0xd00, 0x010); 207 sp887x_writereg(state, 0x0d1, 0x000); 208 return 0; 209 }; 210 211 static int configure_reg0xc05(struct dtv_frontend_properties *p, u16 *reg0xc05) 212 { 213 int known_parameters = 1; 214 215 *reg0xc05 = 0x000; 216 217 switch (p->modulation) { 218 case QPSK: 219 break; 220 case QAM_16: 221 *reg0xc05 |= (1 << 10); 222 break; 223 case QAM_64: 224 *reg0xc05 |= (2 << 10); 225 break; 226 case QAM_AUTO: 227 known_parameters = 0; 228 break; 229 default: 230 return -EINVAL; 231 } 232 233 switch (p->hierarchy) { 234 case HIERARCHY_NONE: 235 break; 236 case HIERARCHY_1: 237 *reg0xc05 |= (1 << 7); 238 break; 239 case HIERARCHY_2: 240 *reg0xc05 |= (2 << 7); 241 break; 242 case HIERARCHY_4: 243 *reg0xc05 |= (3 << 7); 244 break; 245 case HIERARCHY_AUTO: 246 known_parameters = 0; 247 break; 248 default: 249 return -EINVAL; 250 } 251 252 switch (p->code_rate_HP) { 253 case FEC_1_2: 254 break; 255 case FEC_2_3: 256 *reg0xc05 |= (1 << 3); 257 break; 258 case FEC_3_4: 259 *reg0xc05 |= (2 << 3); 260 break; 261 case FEC_5_6: 262 *reg0xc05 |= (3 << 3); 263 break; 264 case FEC_7_8: 265 *reg0xc05 |= (4 << 3); 266 break; 267 case FEC_AUTO: 268 known_parameters = 0; 269 break; 270 default: 271 return -EINVAL; 272 } 273 274 if (known_parameters) 275 *reg0xc05 |= (2 << 1); /* use specified parameters */ 276 else 277 *reg0xc05 |= (1 << 1); /* enable autoprobing */ 278 279 return 0; 280 } 281 282 /* 283 * estimates division of two 24bit numbers, 284 * derived from the ves1820/stv0299 driver code 285 */ 286 static void divide (int n, int d, int *quotient_i, int *quotient_f) 287 { 288 unsigned int q, r; 289 290 r = (n % d) << 8; 291 q = (r / d); 292 293 if (quotient_i) 294 *quotient_i = q; 295 296 if (quotient_f) { 297 r = (r % d) << 8; 298 q = (q << 8) | (r / d); 299 r = (r % d) << 8; 300 *quotient_f = (q << 8) | (r / d); 301 } 302 } 303 304 static void sp887x_correct_offsets (struct sp887x_state* state, 305 struct dtv_frontend_properties *p, 306 int actual_freq) 307 { 308 static const u32 srate_correction [] = { 1879617, 4544878, 8098561 }; 309 int bw_index; 310 int freq_offset = actual_freq - p->frequency; 311 int sysclock = 61003; //[kHz] 312 int ifreq = 36000000; 313 int freq; 314 int frequency_shift; 315 316 switch (p->bandwidth_hz) { 317 default: 318 case 8000000: 319 bw_index = 0; 320 break; 321 case 7000000: 322 bw_index = 1; 323 break; 324 case 6000000: 325 bw_index = 2; 326 break; 327 } 328 329 if (p->inversion == INVERSION_ON) 330 freq = ifreq - freq_offset; 331 else 332 freq = ifreq + freq_offset; 333 334 divide(freq / 333, sysclock, NULL, &frequency_shift); 335 336 if (p->inversion == INVERSION_ON) 337 frequency_shift = -frequency_shift; 338 339 /* sample rate correction */ 340 sp887x_writereg(state, 0x319, srate_correction[bw_index] >> 12); 341 sp887x_writereg(state, 0x31a, srate_correction[bw_index] & 0xfff); 342 343 /* carrier offset correction */ 344 sp887x_writereg(state, 0x309, frequency_shift >> 12); 345 sp887x_writereg(state, 0x30a, frequency_shift & 0xfff); 346 } 347 348 static int sp887x_setup_frontend_parameters(struct dvb_frontend *fe) 349 { 350 struct dtv_frontend_properties *p = &fe->dtv_property_cache; 351 struct sp887x_state* state = fe->demodulator_priv; 352 unsigned actual_freq; 353 int err; 354 u16 val, reg0xc05; 355 356 if (p->bandwidth_hz != 8000000 && 357 p->bandwidth_hz != 7000000 && 358 p->bandwidth_hz != 6000000) 359 return -EINVAL; 360 361 if ((err = configure_reg0xc05(p, ®0xc05))) 362 return err; 363 364 sp887x_microcontroller_stop(state); 365 366 /* setup the PLL */ 367 if (fe->ops.tuner_ops.set_params) { 368 fe->ops.tuner_ops.set_params(fe); 369 if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0); 370 } 371 if (fe->ops.tuner_ops.get_frequency) { 372 fe->ops.tuner_ops.get_frequency(fe, &actual_freq); 373 if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0); 374 } else { 375 actual_freq = p->frequency; 376 } 377 378 /* read status reg in order to clear <pending irqs */ 379 sp887x_readreg(state, 0x200); 380 381 sp887x_correct_offsets(state, p, actual_freq); 382 383 /* filter for 6/7/8 Mhz channel */ 384 if (p->bandwidth_hz == 6000000) 385 val = 2; 386 else if (p->bandwidth_hz == 7000000) 387 val = 1; 388 else 389 val = 0; 390 391 sp887x_writereg(state, 0x311, val); 392 393 /* scan order: 2k first = 0, 8k first = 1 */ 394 if (p->transmission_mode == TRANSMISSION_MODE_2K) 395 sp887x_writereg(state, 0x338, 0x000); 396 else 397 sp887x_writereg(state, 0x338, 0x001); 398 399 sp887x_writereg(state, 0xc05, reg0xc05); 400 401 if (p->bandwidth_hz == 6000000) 402 val = 2 << 3; 403 else if (p->bandwidth_hz == 7000000) 404 val = 3 << 3; 405 else 406 val = 0 << 3; 407 408 /* enable OFDM and SAW bits as lock indicators in sync register 0xf17, 409 * optimize algorithm for given bandwidth... 410 */ 411 sp887x_writereg(state, 0xf14, 0x160 | val); 412 sp887x_writereg(state, 0xf15, 0x000); 413 414 sp887x_microcontroller_start(state); 415 return 0; 416 } 417 418 static int sp887x_read_status(struct dvb_frontend *fe, enum fe_status *status) 419 { 420 struct sp887x_state* state = fe->demodulator_priv; 421 u16 snr12 = sp887x_readreg(state, 0xf16); 422 u16 sync0x200 = sp887x_readreg(state, 0x200); 423 u16 sync0xf17 = sp887x_readreg(state, 0xf17); 424 425 *status = 0; 426 427 if (snr12 > 0x00f) 428 *status |= FE_HAS_SIGNAL; 429 430 //if (sync0x200 & 0x004) 431 // *status |= FE_HAS_SYNC | FE_HAS_CARRIER; 432 433 //if (sync0x200 & 0x008) 434 // *status |= FE_HAS_VITERBI; 435 436 if ((sync0xf17 & 0x00f) == 0x002) { 437 *status |= FE_HAS_LOCK; 438 *status |= FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_CARRIER; 439 } 440 441 if (sync0x200 & 0x001) { /* tuner adjustment requested...*/ 442 int steps = (sync0x200 >> 4) & 0x00f; 443 if (steps & 0x008) 444 steps = -steps; 445 dprintk("sp887x: implement tuner adjustment (%+i steps)!!\n", 446 steps); 447 } 448 449 return 0; 450 } 451 452 static int sp887x_read_ber(struct dvb_frontend* fe, u32* ber) 453 { 454 struct sp887x_state* state = fe->demodulator_priv; 455 456 *ber = (sp887x_readreg(state, 0xc08) & 0x3f) | 457 (sp887x_readreg(state, 0xc07) << 6); 458 sp887x_writereg(state, 0xc08, 0x000); 459 sp887x_writereg(state, 0xc07, 0x000); 460 if (*ber >= 0x3fff0) 461 *ber = ~0; 462 463 return 0; 464 } 465 466 static int sp887x_read_signal_strength(struct dvb_frontend* fe, u16* strength) 467 { 468 struct sp887x_state* state = fe->demodulator_priv; 469 470 u16 snr12 = sp887x_readreg(state, 0xf16); 471 u32 signal = 3 * (snr12 << 4); 472 *strength = (signal < 0xffff) ? signal : 0xffff; 473 474 return 0; 475 } 476 477 static int sp887x_read_snr(struct dvb_frontend* fe, u16* snr) 478 { 479 struct sp887x_state* state = fe->demodulator_priv; 480 481 u16 snr12 = sp887x_readreg(state, 0xf16); 482 *snr = (snr12 << 4) | (snr12 >> 8); 483 484 return 0; 485 } 486 487 static int sp887x_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks) 488 { 489 struct sp887x_state* state = fe->demodulator_priv; 490 491 *ucblocks = sp887x_readreg(state, 0xc0c); 492 if (*ucblocks == 0xfff) 493 *ucblocks = ~0; 494 495 return 0; 496 } 497 498 static int sp887x_i2c_gate_ctrl(struct dvb_frontend* fe, int enable) 499 { 500 struct sp887x_state* state = fe->demodulator_priv; 501 502 if (enable) { 503 return sp887x_writereg(state, 0x206, 0x001); 504 } else { 505 return sp887x_writereg(state, 0x206, 0x000); 506 } 507 } 508 509 static int sp887x_sleep(struct dvb_frontend* fe) 510 { 511 struct sp887x_state* state = fe->demodulator_priv; 512 513 /* tristate TS output and disable interface pins */ 514 sp887x_writereg(state, 0xc18, 0x000); 515 516 return 0; 517 } 518 519 static int sp887x_init(struct dvb_frontend* fe) 520 { 521 struct sp887x_state* state = fe->demodulator_priv; 522 const struct firmware *fw = NULL; 523 int ret; 524 525 if (!state->initialised) { 526 /* request the firmware, this will block until someone uploads it */ 527 printk("sp887x: waiting for firmware upload (%s)...\n", SP887X_DEFAULT_FIRMWARE); 528 ret = state->config->request_firmware(fe, &fw, SP887X_DEFAULT_FIRMWARE); 529 if (ret) { 530 printk("sp887x: no firmware upload (timeout or file not found?)\n"); 531 return ret; 532 } 533 534 ret = sp887x_initial_setup(fe, fw); 535 release_firmware(fw); 536 if (ret) { 537 printk("sp887x: writing firmware to device failed\n"); 538 return ret; 539 } 540 printk("sp887x: firmware upload complete\n"); 541 state->initialised = 1; 542 } 543 544 /* enable TS output and interface pins */ 545 sp887x_writereg(state, 0xc18, 0x00d); 546 547 return 0; 548 } 549 550 static int sp887x_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings) 551 { 552 fesettings->min_delay_ms = 350; 553 fesettings->step_size = 166666*2; 554 fesettings->max_drift = (166666*2)+1; 555 return 0; 556 } 557 558 static void sp887x_release(struct dvb_frontend* fe) 559 { 560 struct sp887x_state* state = fe->demodulator_priv; 561 kfree(state); 562 } 563 564 static const struct dvb_frontend_ops sp887x_ops; 565 566 struct dvb_frontend* sp887x_attach(const struct sp887x_config* config, 567 struct i2c_adapter* i2c) 568 { 569 struct sp887x_state* state = NULL; 570 571 /* allocate memory for the internal state */ 572 state = kzalloc(sizeof(struct sp887x_state), GFP_KERNEL); 573 if (state == NULL) goto error; 574 575 /* setup the state */ 576 state->config = config; 577 state->i2c = i2c; 578 state->initialised = 0; 579 580 /* check if the demod is there */ 581 if (sp887x_readreg(state, 0x0200) < 0) goto error; 582 583 /* create dvb_frontend */ 584 memcpy(&state->frontend.ops, &sp887x_ops, sizeof(struct dvb_frontend_ops)); 585 state->frontend.demodulator_priv = state; 586 return &state->frontend; 587 588 error: 589 kfree(state); 590 return NULL; 591 } 592 593 static const struct dvb_frontend_ops sp887x_ops = { 594 .delsys = { SYS_DVBT }, 595 .info = { 596 .name = "Spase SP887x DVB-T", 597 .frequency_min_hz = 50500 * kHz, 598 .frequency_max_hz = 858000 * kHz, 599 .frequency_stepsize_hz = 166666, 600 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 | 601 FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO | 602 FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | 603 FE_CAN_RECOVER 604 }, 605 606 .release = sp887x_release, 607 608 .init = sp887x_init, 609 .sleep = sp887x_sleep, 610 .i2c_gate_ctrl = sp887x_i2c_gate_ctrl, 611 612 .set_frontend = sp887x_setup_frontend_parameters, 613 .get_tune_settings = sp887x_get_tune_settings, 614 615 .read_status = sp887x_read_status, 616 .read_ber = sp887x_read_ber, 617 .read_signal_strength = sp887x_read_signal_strength, 618 .read_snr = sp887x_read_snr, 619 .read_ucblocks = sp887x_read_ucblocks, 620 }; 621 622 module_param(debug, int, 0644); 623 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off)."); 624 625 MODULE_DESCRIPTION("Spase sp887x DVB-T demodulator driver"); 626 MODULE_LICENSE("GPL"); 627 628 EXPORT_SYMBOL(sp887x_attach); 629