drivers/media/dvb-frontends/tda10021.c

   1 /*
   2     TDA10021  - Single Chip Cable Channel Receiver driver module
   3                used on the Siemens DVB-C cards
   4
   5     Copyright (C) 1999 Convergence Integrated Media GmbH <ralph@convergence.de>
   6     Copyright (C) 2004 Markus Schulz <msc@antzsystem.de>
   7                    Support for TDA10021
   8
   9     This program is free software; you can redistribute it and/or modify
  10     it under the terms of the GNU General Public License as published by
  11     the Free Software Foundation; either version 2 of the License, or
  12     (at your option) any later version.
  13
  14     This program is distributed in the hope that it will be useful,
  15     but WITHOUT ANY WARRANTY; without even the implied warranty of
  16     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17     GNU General Public License for more details.
  18
  19     You should have received a copy of the GNU General Public License
  20     along with this program; if not, write to the Free Software
  21     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 #include <linux/delay.h>
  25 #include <linux/errno.h>
  26 #include <linux/init.h>
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/string.h>
  30 #include <linux/slab.h>
  31
  32 #include "dvb_frontend.h"
  33 #include "tda1002x.h"
  34
  35
  36 struct tda10021_state {
  37         struct i2c_adapter* i2c;
  38         /* configuration settings */
  39         const struct tda1002x_config* config;
  40         struct dvb_frontend frontend;
  41
  42         u8 pwm;
  43         u8 reg0;
  44 };
  45
  46
  47 #if 0
  48 #define dprintk(x...) printk(x)
  49 #else
  50 #define dprintk(x...)
  51 #endif
  52
  53 static int verbose;
  54
  55 #define XIN 57840000UL
  56
  57 #define FIN (XIN >> 4)
  58
  59 static int tda10021_inittab_size = 0x40;
  60 static u8 tda10021_inittab[0x40]=
  61 {
  62         0x73, 0x6a, 0x23, 0x0a, 0x02, 0x37, 0x77, 0x1a,
  63         0x37, 0x6a, 0x17, 0x8a, 0x1e, 0x86, 0x43, 0x40,
  64         0xb8, 0x3f, 0xa1, 0x00, 0xcd, 0x01, 0x00, 0xff,
  65         0x11, 0x00, 0x7c, 0x31, 0x30, 0x20, 0x00, 0x00,
  66         0x02, 0x00, 0x00, 0x7d, 0x00, 0x00, 0x00, 0x00,
  67         0x07, 0x00, 0x33, 0x11, 0x0d, 0x95, 0x08, 0x58,
  68         0x00, 0x00, 0x80, 0x00, 0x80, 0xff, 0x00, 0x00,
  69         0x04, 0x2d, 0x2f, 0xff, 0x00, 0x00, 0x00, 0x00,
  70 };
  71
  72 static int _tda10021_writereg (struct tda10021_state* state, u8 reg, u8 data)
  73 {
  74         u8 buf[] = { reg, data };
  75         struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 2 };
  76         int ret;
  77
  78         ret = i2c_transfer (state->i2c, &msg, 1);
  79         if (ret != 1)
  80                 printk("DVB: TDA10021(%d): %s, writereg error "
  81                         "(reg == 0x%02x, val == 0x%02x, ret == %i)\n",
  82                         state->frontend.dvb->num, __func__, reg, data, ret);
  83
  84         msleep(10);
  85         return (ret != 1) ? -EREMOTEIO : 0;
  86 }
  87
  88 static u8 tda10021_readreg (struct tda10021_state* state, u8 reg)
  89 {
  90         u8 b0 [] = { reg };
  91         u8 b1 [] = { 0 };
  92         struct i2c_msg msg [] = { { .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 1 },
  93                                   { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 1 } };
  94         int ret;
  95
  96         ret = i2c_transfer (state->i2c, msg, 2);
  97         // Don't print an error message if the id is read.
  98         if (ret != 2 && reg != 0x1a)
  99                 printk("DVB: TDA10021: %s: readreg error (ret == %i)\n",
 100                                 __func__, ret);
 101         return b1[0];
 102 }
 103
 104 //get access to tuner
 105 static int lock_tuner(struct tda10021_state* state)
 106 {
 107         u8 buf[2] = { 0x0f, tda10021_inittab[0x0f] | 0x80 };
 108         struct i2c_msg msg = {.addr=state->config->demod_address, .flags=0, .buf=buf, .len=2};
 109
 110         if(i2c_transfer(state->i2c, &msg, 1) != 1)
 111         {
 112                 printk("tda10021: lock tuner fails\n");
 113                 return -EREMOTEIO;
 114         }
 115         return 0;
 116 }
 117
 118 //release access from tuner
 119 static int unlock_tuner(struct tda10021_state* state)
 120 {
 121         u8 buf[2] = { 0x0f, tda10021_inittab[0x0f] & 0x7f };
 122         struct i2c_msg msg_post={.addr=state->config->demod_address, .flags=0, .buf=buf, .len=2};
 123
 124         if(i2c_transfer(state->i2c, &msg_post, 1) != 1)
 125         {
 126                 printk("tda10021: unlock tuner fails\n");
 127                 return -EREMOTEIO;
 128         }
 129         return 0;
 130 }
 131
 132 static int tda10021_setup_reg0(struct tda10021_state *state, u8 reg0,
 133                                enum fe_spectral_inversion inversion)
 134 {
 135         reg0 |= state->reg0 & 0x63;
 136
 137         if ((INVERSION_ON == inversion) ^ (state->config->invert == 0))
 138                 reg0 &= ~0x20;
 139         else
 140                 reg0 |= 0x20;
 141
 142         _tda10021_writereg (state, 0x00, reg0 & 0xfe);
 143         _tda10021_writereg (state, 0x00, reg0 | 0x01);
 144
 145         state->reg0 = reg0;
 146         return 0;
 147 }
 148
 149 static int tda10021_set_symbolrate (struct tda10021_state* state, u32 symbolrate)
 150 {
 151         s32 BDR;
 152         s32 BDRI;
 153         s16 SFIL=0;
 154         u16 NDEC = 0;
 155         u32 tmp, ratio;
 156
 157         if (symbolrate > XIN/2)
 158                 symbolrate = XIN/2;
 159         if (symbolrate < 500000)
 160                 symbolrate = 500000;
 161
 162         if (symbolrate < XIN/16) NDEC = 1;
 163         if (symbolrate < XIN/32) NDEC = 2;
 164         if (symbolrate < XIN/64) NDEC = 3;
 165
 166         if (symbolrate < (u32)(XIN/12.3)) SFIL = 1;
 167         if (symbolrate < (u32)(XIN/16))  SFIL = 0;
 168         if (symbolrate < (u32)(XIN/24.6)) SFIL = 1;
 169         if (symbolrate < (u32)(XIN/32))  SFIL = 0;
 170         if (symbolrate < (u32)(XIN/49.2)) SFIL = 1;
 171         if (symbolrate < (u32)(XIN/64))  SFIL = 0;
 172         if (symbolrate < (u32)(XIN/98.4)) SFIL = 1;
 173
 174         symbolrate <<= NDEC;
 175         ratio = (symbolrate << 4) / FIN;
 176         tmp =  ((symbolrate << 4) % FIN) << 8;
 177         ratio = (ratio << 8) + tmp / FIN;
 178         tmp = (tmp % FIN) << 8;
 179         ratio = (ratio << 8) + DIV_ROUND_CLOSEST(tmp, FIN);
 180
 181         BDR = ratio;
 182         BDRI = (((XIN << 5) / symbolrate) + 1) / 2;
 183
 184         if (BDRI > 0xFF)
 185                 BDRI = 0xFF;
 186
 187         SFIL = (SFIL << 4) | tda10021_inittab[0x0E];
 188
 189         NDEC = (NDEC << 6) | tda10021_inittab[0x03];
 190
 191         _tda10021_writereg (state, 0x03, NDEC);
 192         _tda10021_writereg (state, 0x0a, BDR&0xff);
 193         _tda10021_writereg (state, 0x0b, (BDR>> 8)&0xff);
 194         _tda10021_writereg (state, 0x0c, (BDR>>16)&0x3f);
 195
 196         _tda10021_writereg (state, 0x0d, BDRI);
 197         _tda10021_writereg (state, 0x0e, SFIL);
 198
 199         return 0;
 200 }
 201
 202 static int tda10021_init (struct dvb_frontend *fe)
 203 {
 204         struct tda10021_state* state = fe->demodulator_priv;
 205         int i;
 206
 207         dprintk("DVB: TDA10021(%d): init chip\n", fe->adapter->num);
 208
 209         //_tda10021_writereg (fe, 0, 0);
 210
 211         for (i=0; i<tda10021_inittab_size; i++)
 212                 _tda10021_writereg (state, i, tda10021_inittab[i]);
 213
 214         _tda10021_writereg (state, 0x34, state->pwm);
 215
 216         //Comment by markus
 217         //0x2A[3-0] == PDIV -> P multiplaying factor (P=PDIV+1)(default 0)
 218         //0x2A[4] == BYPPLL -> Power down mode (default 1)
 219         //0x2A[5] == LCK -> PLL Lock Flag
 220         //0x2A[6] == POLAXIN -> Polarity of the input reference clock (default 0)
 221
 222         //Activate PLL
 223         _tda10021_writereg(state, 0x2a, tda10021_inittab[0x2a] & 0xef);
 224         return 0;
 225 }
 226
 227 struct qam_params {
 228         u8 conf, agcref, lthr, mseth, aref;
 229 };
 230
 231 static int tda10021_set_parameters(struct dvb_frontend *fe)
 232 {
 233         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 234         u32 delsys  = c->delivery_system;
 235         unsigned qam = c->modulation;
 236         bool is_annex_c;
 237         u32 reg0x3d;
 238         struct tda10021_state* state = fe->demodulator_priv;
 239         static const struct qam_params qam_params[] = {
 240                 /* Modulation  Conf  AGCref  LTHR  MSETH  AREF */
 241                 [QPSK]     = { 0x14, 0x78,   0x78, 0x8c,  0x96 },
 242                 [QAM_16]   = { 0x00, 0x8c,   0x87, 0xa2,  0x91 },
 243                 [QAM_32]   = { 0x04, 0x8c,   0x64, 0x74,  0x96 },
 244                 [QAM_64]   = { 0x08, 0x6a,   0x46, 0x43,  0x6a },
 245                 [QAM_128]  = { 0x0c, 0x78,   0x36, 0x34,  0x7e },
 246                 [QAM_256]  = { 0x10, 0x5c,   0x26, 0x23,  0x6b },
 247         };
 248
 249         switch (delsys) {
 250         case SYS_DVBC_ANNEX_A:
 251                 is_annex_c = false;
 252                 break;
 253         case SYS_DVBC_ANNEX_C:
 254                 is_annex_c = true;
 255                 break;
 256         default:
 257                 return -EINVAL;
 258         }
 259
 260         /*
 261          * gcc optimizes the code below the same way as it would code:
 262          *           "if (qam > 5) return -EINVAL;"
 263          * Yet, the code is clearer, as it shows what QAM standards are
 264          * supported by the driver, and avoids the usage of magic numbers on
 265          * it.
 266          */
 267         switch (qam) {
 268         case QPSK:
 269         case QAM_16:
 270         case QAM_32:
 271         case QAM_64:
 272         case QAM_128:
 273         case QAM_256:
 274                 break;
 275         default:
 276                 return -EINVAL;
 277         }
 278
 279         if (c->inversion != INVERSION_ON && c->inversion != INVERSION_OFF)
 280                 return -EINVAL;
 281
 282         /*printk("tda10021: set frequency to %d qam=%d symrate=%d\n", p->frequency,qam,p->symbol_rate);*/
 283
 284         if (fe->ops.tuner_ops.set_params) {
 285                 fe->ops.tuner_ops.set_params(fe);
 286                 if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
 287         }
 288
 289         tda10021_set_symbolrate(state, c->symbol_rate);
 290         _tda10021_writereg(state, 0x34, state->pwm);
 291
 292         _tda10021_writereg(state, 0x01, qam_params[qam].agcref);
 293         _tda10021_writereg(state, 0x05, qam_params[qam].lthr);
 294         _tda10021_writereg(state, 0x08, qam_params[qam].mseth);
 295         _tda10021_writereg(state, 0x09, qam_params[qam].aref);
 296
 297         /*
 298          * Bit 0 == 0 means roll-off = 0.15 (Annex A)
 299          *       == 1 means roll-off = 0.13 (Annex C)
 300          */
 301         reg0x3d = tda10021_readreg (state, 0x3d);
 302         if (is_annex_c)
 303                 _tda10021_writereg (state, 0x3d, 0x01 | reg0x3d);
 304         else
 305                 _tda10021_writereg (state, 0x3d, 0xfe & reg0x3d);
 306         tda10021_setup_reg0(state, qam_params[qam].conf, c->inversion);
 307
 308         return 0;
 309 }
 310
 311 static int tda10021_read_status(struct dvb_frontend *fe,
 312                                 enum fe_status *status)
 313 {
 314         struct tda10021_state* state = fe->demodulator_priv;
 315         int sync;
 316
 317         *status = 0;
 318         //0x11[0] == EQALGO -> Equalizer algorithms state
 319         //0x11[1] == CARLOCK -> Carrier locked
 320         //0x11[2] == FSYNC -> Frame synchronisation
 321         //0x11[3] == FEL -> Front End locked
 322         //0x11[6] == NODVB -> DVB Mode Information
 323         sync = tda10021_readreg (state, 0x11);
 324
 325         if (sync & 2)
 326                 *status |= FE_HAS_SIGNAL|FE_HAS_CARRIER;
 327
 328         if (sync & 4)
 329                 *status |= FE_HAS_SYNC|FE_HAS_VITERBI;
 330
 331         if (sync & 8)
 332                 *status |= FE_HAS_LOCK;
 333
 334         return 0;
 335 }
 336
 337 static int tda10021_read_ber(struct dvb_frontend* fe, u32* ber)
 338 {
 339         struct tda10021_state* state = fe->demodulator_priv;
 340
 341         u32 _ber = tda10021_readreg(state, 0x14) |
 342                 (tda10021_readreg(state, 0x15) << 8) |
 343                 ((tda10021_readreg(state, 0x16) & 0x0f) << 16);
 344         _tda10021_writereg(state, 0x10, (tda10021_readreg(state, 0x10) & ~0xc0)
 345                                         | (tda10021_inittab[0x10] & 0xc0));
 346         *ber = 10 * _ber;
 347
 348         return 0;
 349 }
 350
 351 static int tda10021_read_signal_strength(struct dvb_frontend* fe, u16* strength)
 352 {
 353         struct tda10021_state* state = fe->demodulator_priv;
 354
 355         u8 config = tda10021_readreg(state, 0x02);
 356         u8 gain = tda10021_readreg(state, 0x17);
 357         if (config & 0x02)
 358                 /* the agc value is inverted */
 359                 gain = ~gain;
 360         *strength = (gain << 8) | gain;
 361
 362         return 0;
 363 }
 364
 365 static int tda10021_read_snr(struct dvb_frontend* fe, u16* snr)
 366 {
 367         struct tda10021_state* state = fe->demodulator_priv;
 368
 369         u8 quality = ~tda10021_readreg(state, 0x18);
 370         *snr = (quality << 8) | quality;
 371
 372         return 0;
 373 }
 374
 375 static int tda10021_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
 376 {
 377         struct tda10021_state* state = fe->demodulator_priv;
 378
 379         *ucblocks = tda10021_readreg (state, 0x13) & 0x7f;
 380         if (*ucblocks == 0x7f)
 381                 *ucblocks = 0xffffffff;
 382
 383         /* reset uncorrected block counter */
 384         _tda10021_writereg (state, 0x10, tda10021_inittab[0x10] & 0xdf);
 385         _tda10021_writereg (state, 0x10, tda10021_inittab[0x10]);
 386
 387         return 0;
 388 }
 389
 390 static int tda10021_get_frontend(struct dvb_frontend *fe,
 391                                  struct dtv_frontend_properties *p)
 392 {
 393         struct tda10021_state* state = fe->demodulator_priv;
 394         int sync;
 395         s8 afc = 0;
 396
 397         sync = tda10021_readreg(state, 0x11);
 398         afc = tda10021_readreg(state, 0x19);
 399         if (verbose) {
 400                 /* AFC only valid when carrier has been recovered */
 401                 printk(sync & 2 ? "DVB: TDA10021(%d): AFC (%d) %dHz\n" :
 402                                   "DVB: TDA10021(%d): [AFC (%d) %dHz]\n",
 403                         state->frontend.dvb->num, afc,
 404                        -((s32)p->symbol_rate * afc) >> 10);
 405         }
 406
 407         p->inversion = ((state->reg0 & 0x20) == 0x20) ^ (state->config->invert != 0) ? INVERSION_ON : INVERSION_OFF;
 408         p->modulation = ((state->reg0 >> 2) & 7) + QAM_16;
 409
 410         p->fec_inner = FEC_NONE;
 411         p->frequency = ((p->frequency + 31250) / 62500) * 62500;
 412
 413         if (sync & 2)
 414                 p->frequency -= ((s32)p->symbol_rate * afc) >> 10;
 415
 416         return 0;
 417 }
 418
 419 static int tda10021_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
 420 {
 421         struct tda10021_state* state = fe->demodulator_priv;
 422
 423         if (enable) {
 424                 lock_tuner(state);
 425         } else {
 426                 unlock_tuner(state);
 427         }
 428         return 0;
 429 }
 430
 431 static int tda10021_sleep(struct dvb_frontend* fe)
 432 {
 433         struct tda10021_state* state = fe->demodulator_priv;
 434
 435         _tda10021_writereg (state, 0x1b, 0x02);  /* pdown ADC */
 436         _tda10021_writereg (state, 0x00, 0x80);  /* standby */
 437
 438         return 0;
 439 }
 440
 441 static void tda10021_release(struct dvb_frontend* fe)
 442 {
 443         struct tda10021_state* state = fe->demodulator_priv;
 444         kfree(state);
 445 }
 446
 447 static struct dvb_frontend_ops tda10021_ops;
 448
 449 struct dvb_frontend* tda10021_attach(const struct tda1002x_config* config,
 450                                      struct i2c_adapter* i2c,
 451                                      u8 pwm)
 452 {
 453         struct tda10021_state* state = NULL;
 454         u8 id;
 455
 456         /* allocate memory for the internal state */
 457         state = kzalloc(sizeof(struct tda10021_state), GFP_KERNEL);
 458         if (state == NULL) goto error;
 459
 460         /* setup the state */
 461         state->config = config;
 462         state->i2c = i2c;
 463         state->pwm = pwm;
 464         state->reg0 = tda10021_inittab[0];
 465
 466         /* check if the demod is there */
 467         id = tda10021_readreg(state, 0x1a);
 468         if ((id & 0xf0) != 0x70) goto error;
 469
 470         /* Don't claim TDA10023 */
 471         if (id == 0x7d)
 472                 goto error;
 473
 474         printk("TDA10021: i2c-addr = 0x%02x, id = 0x%02x\n",
 475                state->config->demod_address, id);
 476
 477         /* create dvb_frontend */
 478         memcpy(&state->frontend.ops, &tda10021_ops, sizeof(struct dvb_frontend_ops));
 479         state->frontend.demodulator_priv = state;
 480         return &state->frontend;
 481
 482 error:
 483         kfree(state);
 484         return NULL;
 485 }
 486
 487 static struct dvb_frontend_ops tda10021_ops = {
 488         .delsys = { SYS_DVBC_ANNEX_A, SYS_DVBC_ANNEX_C },
 489         .info = {
 490                 .name = "Philips TDA10021 DVB-C",
 491                 .frequency_stepsize = 62500,
 492                 .frequency_min = 47000000,
 493                 .frequency_max = 862000000,
 494                 .symbol_rate_min = (XIN/2)/64,     /* SACLK/64 == (XIN/2)/64 */
 495                 .symbol_rate_max = (XIN/2)/4,      /* SACLK/4 */
 496         #if 0
 497                 .frequency_tolerance = ???,
 498                 .symbol_rate_tolerance = ???,  /* ppm */  /* == 8% (spec p. 5) */
 499         #endif
 500                 .caps = 0x400 | //FE_CAN_QAM_4
 501                         FE_CAN_QAM_16 | FE_CAN_QAM_32 | FE_CAN_QAM_64 |
 502                         FE_CAN_QAM_128 | FE_CAN_QAM_256 |
 503                         FE_CAN_FEC_AUTO
 504         },
 505
 506         .release = tda10021_release,
 507
 508         .init = tda10021_init,
 509         .sleep = tda10021_sleep,
 510         .i2c_gate_ctrl = tda10021_i2c_gate_ctrl,
 511
 512         .set_frontend = tda10021_set_parameters,
 513         .get_frontend = tda10021_get_frontend,
 514
 515         .read_status = tda10021_read_status,
 516         .read_ber = tda10021_read_ber,
 517         .read_signal_strength = tda10021_read_signal_strength,
 518         .read_snr = tda10021_read_snr,
 519         .read_ucblocks = tda10021_read_ucblocks,
 520 };
 521
 522 module_param(verbose, int, 0644);
 523 MODULE_PARM_DESC(verbose, "print AFC offset after tuning for debugging the PWM setting");
 524
 525 MODULE_DESCRIPTION("Philips TDA10021 DVB-C demodulator driver");
 526 MODULE_AUTHOR("Ralph Metzler, Holger Waechtler, Markus Schulz");
 527 MODULE_LICENSE("GPL");
 528
 529 EXPORT_SYMBOL(tda10021_attach);