drivers/media/dvb-frontends/tda10021.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3     TDA10021  - Single Chip Cable Channel Receiver driver module
   4                used on the Siemens DVB-C cards
   5
   6     Copyright (C) 1999 Convergence Integrated Media GmbH <ralph@convergence.de>
   7     Copyright (C) 2004 Markus Schulz <msc@antzsystem.de>
   8                    Support for TDA10021
   9
  10 */
  11
  12 #include <linux/delay.h>
  13 #include <linux/errno.h>
  14 #include <linux/init.h>
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/string.h>
  18 #include <linux/slab.h>
  19
  20 #include <media/dvb_frontend.h>
  21 #include "tda1002x.h"
  22
  23
  24 struct tda10021_state {
  25         struct i2c_adapter* i2c;
  26         /* configuration settings */
  27         const struct tda1002x_config* config;
  28         struct dvb_frontend frontend;
  29
  30         u8 pwm;
  31         u8 reg0;
  32 };
  33
  34
  35 #if 0
  36 #define dprintk(x...) printk(x)
  37 #else
  38 #define dprintk(x...)
  39 #endif
  40
  41 static int verbose;
  42
  43 #define XIN 57840000UL
  44
  45 #define FIN (XIN >> 4)
  46
  47 static int tda10021_inittab_size = 0x40;
  48 static u8 tda10021_inittab[0x40]=
  49 {
  50         0x73, 0x6a, 0x23, 0x0a, 0x02, 0x37, 0x77, 0x1a,
  51         0x37, 0x6a, 0x17, 0x8a, 0x1e, 0x86, 0x43, 0x40,
  52         0xb8, 0x3f, 0xa1, 0x00, 0xcd, 0x01, 0x00, 0xff,
  53         0x11, 0x00, 0x7c, 0x31, 0x30, 0x20, 0x00, 0x00,
  54         0x02, 0x00, 0x00, 0x7d, 0x00, 0x00, 0x00, 0x00,
  55         0x07, 0x00, 0x33, 0x11, 0x0d, 0x95, 0x08, 0x58,
  56         0x00, 0x00, 0x80, 0x00, 0x80, 0xff, 0x00, 0x00,
  57         0x04, 0x2d, 0x2f, 0xff, 0x00, 0x00, 0x00, 0x00,
  58 };
  59
  60 static int _tda10021_writereg (struct tda10021_state* state, u8 reg, u8 data)
  61 {
  62         u8 buf[] = { reg, data };
  63         struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 2 };
  64         int ret;
  65
  66         ret = i2c_transfer (state->i2c, &msg, 1);
  67         if (ret != 1)
  68                 printk("DVB: TDA10021(%d): %s, writereg error (reg == 0x%02x, val == 0x%02x, ret == %i)\n",
  69                         state->frontend.dvb->num, __func__, reg, data, ret);
  70
  71         msleep(10);
  72         return (ret != 1) ? -EREMOTEIO : 0;
  73 }
  74
  75 static u8 tda10021_readreg (struct tda10021_state* state, u8 reg)
  76 {
  77         u8 b0 [] = { reg };
  78         u8 b1 [] = { 0 };
  79         struct i2c_msg msg [] = { { .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 1 },
  80                                   { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 1 } };
  81         int ret;
  82
  83         ret = i2c_transfer (state->i2c, msg, 2);
  84         // Don't print an error message if the id is read.
  85         if (ret != 2 && reg != 0x1a)
  86                 printk("DVB: TDA10021: %s: readreg error (ret == %i)\n",
  87                                 __func__, ret);
  88         return b1[0];
  89 }
  90
  91 //get access to tuner
  92 static int lock_tuner(struct tda10021_state* state)
  93 {
  94         u8 buf[2] = { 0x0f, tda10021_inittab[0x0f] | 0x80 };
  95         struct i2c_msg msg = {.addr=state->config->demod_address, .flags=0, .buf=buf, .len=2};
  96
  97         if(i2c_transfer(state->i2c, &msg, 1) != 1)
  98         {
  99                 printk("tda10021: lock tuner fails\n");
 100                 return -EREMOTEIO;
 101         }
 102         return 0;
 103 }
 104
 105 //release access from tuner
 106 static int unlock_tuner(struct tda10021_state* state)
 107 {
 108         u8 buf[2] = { 0x0f, tda10021_inittab[0x0f] & 0x7f };
 109         struct i2c_msg msg_post={.addr=state->config->demod_address, .flags=0, .buf=buf, .len=2};
 110
 111         if(i2c_transfer(state->i2c, &msg_post, 1) != 1)
 112         {
 113                 printk("tda10021: unlock tuner fails\n");
 114                 return -EREMOTEIO;
 115         }
 116         return 0;
 117 }
 118
 119 static int tda10021_setup_reg0(struct tda10021_state *state, u8 reg0,
 120                                enum fe_spectral_inversion inversion)
 121 {
 122         reg0 |= state->reg0 & 0x63;
 123
 124         if ((INVERSION_ON == inversion) ^ (state->config->invert == 0))
 125                 reg0 &= ~0x20;
 126         else
 127                 reg0 |= 0x20;
 128
 129         _tda10021_writereg (state, 0x00, reg0 & 0xfe);
 130         _tda10021_writereg (state, 0x00, reg0 | 0x01);
 131
 132         state->reg0 = reg0;
 133         return 0;
 134 }
 135
 136 static int tda10021_set_symbolrate (struct tda10021_state* state, u32 symbolrate)
 137 {
 138         s32 BDR;
 139         s32 BDRI;
 140         s16 SFIL = 0;
 141         u16 NDEC = 0;
 142         u32 tmp, ratio;
 143
 144         if (symbolrate > XIN / 2)
 145                 symbolrate = XIN / 2;
 146         else if (symbolrate < 500000)
 147                 symbolrate = 500000;
 148
 149         if (symbolrate < XIN / 16)
 150                 NDEC = 1;
 151         if (symbolrate < XIN / 32)
 152                 NDEC = 2;
 153         if (symbolrate < XIN / 64)
 154                 NDEC = 3;
 155
 156         if (symbolrate < XIN * 10 / 123)
 157                 SFIL = 1;
 158         if (symbolrate < XIN * 10 / 160)
 159                 SFIL = 0;
 160         if (symbolrate < XIN * 10 / 246)
 161                 SFIL = 1;
 162         if (symbolrate < XIN * 10 / 320)
 163                 SFIL = 0;
 164         if (symbolrate < XIN * 10 / 492)
 165                 SFIL = 1;
 166         if (symbolrate < XIN * 10 / 640)
 167                 SFIL = 0;
 168         if (symbolrate < XIN * 10 / 984)
 169                 SFIL = 1;
 170
 171         symbolrate <<= NDEC;
 172         ratio = (symbolrate << 4) / FIN;
 173         tmp =  ((symbolrate << 4) % FIN) << 8;
 174         ratio = (ratio << 8) + tmp / FIN;
 175         tmp = (tmp % FIN) << 8;
 176         ratio = (ratio << 8) + DIV_ROUND_CLOSEST(tmp, FIN);
 177
 178         BDR = ratio;
 179         BDRI = (((XIN << 5) / symbolrate) + 1) / 2;
 180
 181         if (BDRI > 0xFF)
 182                 BDRI = 0xFF;
 183
 184         SFIL = (SFIL << 4) | tda10021_inittab[0x0E];
 185
 186         NDEC = (NDEC << 6) | tda10021_inittab[0x03];
 187
 188         _tda10021_writereg (state, 0x03, NDEC);
 189         _tda10021_writereg (state, 0x0a, BDR&0xff);
 190         _tda10021_writereg (state, 0x0b, (BDR>> 8)&0xff);
 191         _tda10021_writereg (state, 0x0c, (BDR>>16)&0x3f);
 192
 193         _tda10021_writereg (state, 0x0d, BDRI);
 194         _tda10021_writereg (state, 0x0e, SFIL);
 195
 196         return 0;
 197 }
 198
 199 static int tda10021_init (struct dvb_frontend *fe)
 200 {
 201         struct tda10021_state* state = fe->demodulator_priv;
 202         int i;
 203
 204         dprintk("DVB: TDA10021(%d): init chip\n", fe->adapter->num);
 205
 206         //_tda10021_writereg (fe, 0, 0);
 207
 208         for (i=0; i<tda10021_inittab_size; i++)
 209                 _tda10021_writereg (state, i, tda10021_inittab[i]);
 210
 211         _tda10021_writereg (state, 0x34, state->pwm);
 212
 213         //Comment by markus
 214         //0x2A[3-0] == PDIV -> P multiplaying factor (P=PDIV+1)(default 0)
 215         //0x2A[4] == BYPPLL -> Power down mode (default 1)
 216         //0x2A[5] == LCK -> PLL Lock Flag
 217         //0x2A[6] == POLAXIN -> Polarity of the input reference clock (default 0)
 218
 219         //Activate PLL
 220         _tda10021_writereg(state, 0x2a, tda10021_inittab[0x2a] & 0xef);
 221         return 0;
 222 }
 223
 224 struct qam_params {
 225         u8 conf, agcref, lthr, mseth, aref;
 226 };
 227
 228 static int tda10021_set_parameters(struct dvb_frontend *fe)
 229 {
 230         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 231         u32 delsys  = c->delivery_system;
 232         unsigned qam = c->modulation;
 233         bool is_annex_c;
 234         u32 reg0x3d;
 235         struct tda10021_state* state = fe->demodulator_priv;
 236         static const struct qam_params qam_params[] = {
 237                 /* Modulation  Conf  AGCref  LTHR  MSETH  AREF */
 238                 [QPSK]     = { 0x14, 0x78,   0x78, 0x8c,  0x96 },
 239                 [QAM_16]   = { 0x00, 0x8c,   0x87, 0xa2,  0x91 },
 240                 [QAM_32]   = { 0x04, 0x8c,   0x64, 0x74,  0x96 },
 241                 [QAM_64]   = { 0x08, 0x6a,   0x46, 0x43,  0x6a },
 242                 [QAM_128]  = { 0x0c, 0x78,   0x36, 0x34,  0x7e },
 243                 [QAM_256]  = { 0x10, 0x5c,   0x26, 0x23,  0x6b },
 244         };
 245
 246         switch (delsys) {
 247         case SYS_DVBC_ANNEX_A:
 248                 is_annex_c = false;
 249                 break;
 250         case SYS_DVBC_ANNEX_C:
 251                 is_annex_c = true;
 252                 break;
 253         default:
 254                 return -EINVAL;
 255         }
 256
 257         /*
 258          * gcc optimizes the code below the same way as it would code:
 259          *           "if (qam > 5) return -EINVAL;"
 260          * Yet, the code is clearer, as it shows what QAM standards are
 261          * supported by the driver, and avoids the usage of magic numbers on
 262          * it.
 263          */
 264         switch (qam) {
 265         case QPSK:
 266         case QAM_16:
 267         case QAM_32:
 268         case QAM_64:
 269         case QAM_128:
 270         case QAM_256:
 271                 break;
 272         default:
 273                 return -EINVAL;
 274         }
 275
 276         if (c->inversion != INVERSION_ON && c->inversion != INVERSION_OFF)
 277                 return -EINVAL;
 278
 279         /*printk("tda10021: set frequency to %d qam=%d symrate=%d\n", p->frequency,qam,p->symbol_rate);*/
 280
 281         if (fe->ops.tuner_ops.set_params) {
 282                 fe->ops.tuner_ops.set_params(fe);
 283                 if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
 284         }
 285
 286         tda10021_set_symbolrate(state, c->symbol_rate);
 287         _tda10021_writereg(state, 0x34, state->pwm);
 288
 289         _tda10021_writereg(state, 0x01, qam_params[qam].agcref);
 290         _tda10021_writereg(state, 0x05, qam_params[qam].lthr);
 291         _tda10021_writereg(state, 0x08, qam_params[qam].mseth);
 292         _tda10021_writereg(state, 0x09, qam_params[qam].aref);
 293
 294         /*
 295          * Bit 0 == 0 means roll-off = 0.15 (Annex A)
 296          *       == 1 means roll-off = 0.13 (Annex C)
 297          */
 298         reg0x3d = tda10021_readreg (state, 0x3d);
 299         if (is_annex_c)
 300                 _tda10021_writereg (state, 0x3d, 0x01 | reg0x3d);
 301         else
 302                 _tda10021_writereg (state, 0x3d, 0xfe & reg0x3d);
 303         tda10021_setup_reg0(state, qam_params[qam].conf, c->inversion);
 304
 305         return 0;
 306 }
 307
 308 static int tda10021_read_status(struct dvb_frontend *fe,
 309                                 enum fe_status *status)
 310 {
 311         struct tda10021_state* state = fe->demodulator_priv;
 312         int sync;
 313
 314         *status = 0;
 315         //0x11[0] == EQALGO -> Equalizer algorithms state
 316         //0x11[1] == CARLOCK -> Carrier locked
 317         //0x11[2] == FSYNC -> Frame synchronisation
 318         //0x11[3] == FEL -> Front End locked
 319         //0x11[6] == NODVB -> DVB Mode Information
 320         sync = tda10021_readreg (state, 0x11);
 321
 322         if (sync & 2)
 323                 *status |= FE_HAS_SIGNAL|FE_HAS_CARRIER;
 324
 325         if (sync & 4)
 326                 *status |= FE_HAS_SYNC|FE_HAS_VITERBI;
 327
 328         if (sync & 8)
 329                 *status |= FE_HAS_LOCK;
 330
 331         return 0;
 332 }
 333
 334 static int tda10021_read_ber(struct dvb_frontend* fe, u32* ber)
 335 {
 336         struct tda10021_state* state = fe->demodulator_priv;
 337
 338         u32 _ber = tda10021_readreg(state, 0x14) |
 339                 (tda10021_readreg(state, 0x15) << 8) |
 340                 ((tda10021_readreg(state, 0x16) & 0x0f) << 16);
 341         _tda10021_writereg(state, 0x10, (tda10021_readreg(state, 0x10) & ~0xc0)
 342                                         | (tda10021_inittab[0x10] & 0xc0));
 343         *ber = 10 * _ber;
 344
 345         return 0;
 346 }
 347
 348 static int tda10021_read_signal_strength(struct dvb_frontend* fe, u16* strength)
 349 {
 350         struct tda10021_state* state = fe->demodulator_priv;
 351
 352         u8 config = tda10021_readreg(state, 0x02);
 353         u8 gain = tda10021_readreg(state, 0x17);
 354         if (config & 0x02)
 355                 /* the agc value is inverted */
 356                 gain = ~gain;
 357         *strength = (gain << 8) | gain;
 358
 359         return 0;
 360 }
 361
 362 static int tda10021_read_snr(struct dvb_frontend* fe, u16* snr)
 363 {
 364         struct tda10021_state* state = fe->demodulator_priv;
 365
 366         u8 quality = ~tda10021_readreg(state, 0x18);
 367         *snr = (quality << 8) | quality;
 368
 369         return 0;
 370 }
 371
 372 static int tda10021_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
 373 {
 374         struct tda10021_state* state = fe->demodulator_priv;
 375
 376         *ucblocks = tda10021_readreg (state, 0x13) & 0x7f;
 377         if (*ucblocks == 0x7f)
 378                 *ucblocks = 0xffffffff;
 379
 380         /* reset uncorrected block counter */
 381         _tda10021_writereg (state, 0x10, tda10021_inittab[0x10] & 0xdf);
 382         _tda10021_writereg (state, 0x10, tda10021_inittab[0x10]);
 383
 384         return 0;
 385 }
 386
 387 static int tda10021_get_frontend(struct dvb_frontend *fe,
 388                                  struct dtv_frontend_properties *p)
 389 {
 390         struct tda10021_state* state = fe->demodulator_priv;
 391         int sync;
 392         s8 afc = 0;
 393
 394         sync = tda10021_readreg(state, 0x11);
 395         afc = tda10021_readreg(state, 0x19);
 396         if (verbose) {
 397                 /* AFC only valid when carrier has been recovered */
 398                 printk(sync & 2 ? "DVB: TDA10021(%d): AFC (%d) %dHz\n" :
 399                                   "DVB: TDA10021(%d): [AFC (%d) %dHz]\n",
 400                         state->frontend.dvb->num, afc,
 401                        -((s32)p->symbol_rate * afc) >> 10);
 402         }
 403
 404         p->inversion = ((state->reg0 & 0x20) == 0x20) ^ (state->config->invert != 0) ? INVERSION_ON : INVERSION_OFF;
 405         p->modulation = ((state->reg0 >> 2) & 7) + QAM_16;
 406
 407         p->fec_inner = FEC_NONE;
 408         p->frequency = ((p->frequency + 31250) / 62500) * 62500;
 409
 410         if (sync & 2)
 411                 p->frequency -= ((s32)p->symbol_rate * afc) >> 10;
 412
 413         return 0;
 414 }
 415
 416 static int tda10021_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
 417 {
 418         struct tda10021_state* state = fe->demodulator_priv;
 419
 420         if (enable) {
 421                 lock_tuner(state);
 422         } else {
 423                 unlock_tuner(state);
 424         }
 425         return 0;
 426 }
 427
 428 static int tda10021_sleep(struct dvb_frontend* fe)
 429 {
 430         struct tda10021_state* state = fe->demodulator_priv;
 431
 432         _tda10021_writereg (state, 0x1b, 0x02);  /* pdown ADC */
 433         _tda10021_writereg (state, 0x00, 0x80);  /* standby */
 434
 435         return 0;
 436 }
 437
 438 static void tda10021_release(struct dvb_frontend* fe)
 439 {
 440         struct tda10021_state* state = fe->demodulator_priv;
 441         kfree(state);
 442 }
 443
 444 static const struct dvb_frontend_ops tda10021_ops;
 445
 446 struct dvb_frontend* tda10021_attach(const struct tda1002x_config* config,
 447                                      struct i2c_adapter* i2c,
 448                                      u8 pwm)
 449 {
 450         struct tda10021_state* state = NULL;
 451         u8 id;
 452
 453         /* allocate memory for the internal state */
 454         state = kzalloc(sizeof(struct tda10021_state), GFP_KERNEL);
 455         if (state == NULL) goto error;
 456
 457         /* setup the state */
 458         state->config = config;
 459         state->i2c = i2c;
 460         state->pwm = pwm;
 461         state->reg0 = tda10021_inittab[0];
 462
 463         /* check if the demod is there */
 464         id = tda10021_readreg(state, 0x1a);
 465         if ((id & 0xf0) != 0x70) goto error;
 466
 467         /* Don't claim TDA10023 */
 468         if (id == 0x7d)
 469                 goto error;
 470
 471         printk("TDA10021: i2c-addr = 0x%02x, id = 0x%02x\n",
 472                state->config->demod_address, id);
 473
 474         /* create dvb_frontend */
 475         memcpy(&state->frontend.ops, &tda10021_ops, sizeof(struct dvb_frontend_ops));
 476         state->frontend.demodulator_priv = state;
 477         return &state->frontend;
 478
 479 error:
 480         kfree(state);
 481         return NULL;
 482 }
 483
 484 static const struct dvb_frontend_ops tda10021_ops = {
 485         .delsys = { SYS_DVBC_ANNEX_A, SYS_DVBC_ANNEX_C },
 486         .info = {
 487                 .name = "Philips TDA10021 DVB-C",
 488                 .frequency_min_hz =  47 * MHz,
 489                 .frequency_max_hz = 862 * MHz,
 490                 .frequency_stepsize_hz = 62500,
 491                 .symbol_rate_min = (XIN / 2) / 64,     /* SACLK/64 == (XIN/2)/64 */
 492                 .symbol_rate_max = (XIN / 2) / 4,      /* SACLK/4 */
 493         #if 0
 494                 .frequency_tolerance = ???,
 495                 .symbol_rate_tolerance = ???,  /* ppm */  /* == 8% (spec p. 5) */
 496         #endif
 497                 .caps = 0x400 | //FE_CAN_QAM_4
 498                         FE_CAN_QAM_16 | FE_CAN_QAM_32 | FE_CAN_QAM_64 |
 499                         FE_CAN_QAM_128 | FE_CAN_QAM_256 |
 500                         FE_CAN_FEC_AUTO
 501         },
 502
 503         .release = tda10021_release,
 504
 505         .init = tda10021_init,
 506         .sleep = tda10021_sleep,
 507         .i2c_gate_ctrl = tda10021_i2c_gate_ctrl,
 508
 509         .set_frontend = tda10021_set_parameters,
 510         .get_frontend = tda10021_get_frontend,
 511
 512         .read_status = tda10021_read_status,
 513         .read_ber = tda10021_read_ber,
 514         .read_signal_strength = tda10021_read_signal_strength,
 515         .read_snr = tda10021_read_snr,
 516         .read_ucblocks = tda10021_read_ucblocks,
 517 };
 518
 519 module_param(verbose, int, 0644);
 520 MODULE_PARM_DESC(verbose, "print AFC offset after tuning for debugging the PWM setting");
 521
 522 MODULE_DESCRIPTION("Philips TDA10021 DVB-C demodulator driver");
 523 MODULE_AUTHOR("Ralph Metzler, Holger Waechtler, Markus Schulz");
 524 MODULE_LICENSE("GPL");
 525
 526 EXPORT_SYMBOL(tda10021_attach);