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