drivers/media/dvb-frontends/sp887x.c

   1 /*
   2    Driver for the Spase sp887x demodulator
   3 */
   4
   5 /*
   6  * This driver needs external firmware. Please use the command
   7  * "<kerneldir>/Documentation/dvb/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 (i+c > FW_SIZE)
 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, &reg0xc05)))
 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 =  50500000,
 598                 .frequency_max = 858000000,
 599                 .frequency_stepsize = 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);