drivers/media/dvb/frontends/tda10021.c

   1 /*
   2     TDA10021  - Single Chip Cable Channel Receiver driver module
   3                used on the 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/config.h>
  25 #include <linux/delay.h>
  26 #include <linux/errno.h>
  27 #include <linux/init.h>
  28 #include <linux/kernel.h>
  29 #include <linux/module.h>
  30 #include <linux/string.h>
  31 #include <linux/slab.h>
  32
  33 #include "dvb_frontend.h"
  34 #include "tda10021.h"
  35
  36
  37 struct tda10021_state {
  38         struct i2c_adapter* i2c;
  39         struct dvb_frontend_ops ops;
  40         /* configuration settings */
  41         const struct tda10021_config* config;
  42         struct dvb_frontend frontend;
  43
  44         u8 pwm;
  45         u8 reg0;
  46 };
  47
  48
  49 #if 0
  50 #define dprintk(x...) printk(x)
  51 #else
  52 #define dprintk(x...)
  53 #endif
  54
  55 static int verbose;
  56
  57 #define XIN 57840000UL
  58 #define DISABLE_INVERSION(reg0)         do { reg0 |= 0x20; } while (0)
  59 #define ENABLE_INVERSION(reg0)          do { reg0 &= ~0x20; } while (0)
  60 #define HAS_INVERSION(reg0)             (!(reg0 & 0x20))
  61
  62 #define FIN (XIN >> 4)
  63
  64 static int tda10021_inittab_size = 0x40;
  65 static u8 tda10021_inittab[0x40]=
  66 {
  67         0x73, 0x6a, 0x23, 0x0a, 0x02, 0x37, 0x77, 0x1a,
  68         0x37, 0x6a, 0x17, 0x8a, 0x1e, 0x86, 0x43, 0x40,
  69         0xb8, 0x3f, 0xa0, 0x00, 0xcd, 0x01, 0x00, 0xff,
  70         0x11, 0x00, 0x7c, 0x31, 0x30, 0x20, 0x00, 0x00,
  71         0x02, 0x00, 0x00, 0x7d, 0x00, 0x00, 0x00, 0x00,
  72         0x07, 0x00, 0x33, 0x11, 0x0d, 0x95, 0x08, 0x58,
  73         0x00, 0x00, 0x80, 0x00, 0x80, 0xff, 0x00, 0x00,
  74         0x04, 0x2d, 0x2f, 0xff, 0x00, 0x00, 0x00, 0x00,
  75 };
  76
  77 static int tda10021_writereg (struct tda10021_state* state, u8 reg, u8 data)
  78 {
  79         u8 buf[] = { reg, data };
  80         struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 2 };
  81         int ret;
  82
  83         ret = i2c_transfer (state->i2c, &msg, 1);
  84         if (ret != 1)
  85                 printk("DVB: TDA10021(%d): %s, writereg error "
  86                         "(reg == 0x%02x, val == 0x%02x, ret == %i)\n",
  87                         state->frontend.dvb->num, __FUNCTION__, reg, data, ret);
  88
  89         msleep(10);
  90         return (ret != 1) ? -EREMOTEIO : 0;
  91 }
  92
  93 static u8 tda10021_readreg (struct tda10021_state* state, u8 reg)
  94 {
  95         u8 b0 [] = { reg };
  96         u8 b1 [] = { 0 };
  97         struct i2c_msg msg [] = { { .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 1 },
  98                                   { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 1 } };
  99         int ret;
 100
 101         ret = i2c_transfer (state->i2c, msg, 2);
 102         if (ret != 2)
 103                 printk("DVB: TDA10021: %s: readreg error (ret == %i)\n",
 104                                 __FUNCTION__, ret);
 105         return b1[0];
 106 }
 107
 108 //get access to tuner
 109 static int lock_tuner(struct tda10021_state* state)
 110 {
 111         u8 buf[2] = { 0x0f, tda10021_inittab[0x0f] | 0x80 };
 112         struct i2c_msg msg = {.addr=state->config->demod_address, .flags=0, .buf=buf, .len=2};
 113
 114         if(i2c_transfer(state->i2c, &msg, 1) != 1)
 115         {
 116                 printk("tda10021: lock tuner fails\n");
 117                 return -EREMOTEIO;
 118         }
 119         return 0;
 120 }
 121
 122 //release access from tuner
 123 static int unlock_tuner(struct tda10021_state* state)
 124 {
 125         u8 buf[2] = { 0x0f, tda10021_inittab[0x0f] & 0x7f };
 126         struct i2c_msg msg_post={.addr=state->config->demod_address, .flags=0, .buf=buf, .len=2};
 127
 128         if(i2c_transfer(state->i2c, &msg_post, 1) != 1)
 129         {
 130                 printk("tda10021: unlock tuner fails\n");
 131                 return -EREMOTEIO;
 132         }
 133         return 0;
 134 }
 135
 136 static int tda10021_setup_reg0 (struct tda10021_state* state, u8 reg0,
 137                                 fe_spectral_inversion_t inversion)
 138 {
 139         reg0 |= state->reg0 & 0x63;
 140
 141         if (INVERSION_ON == inversion)
 142                 ENABLE_INVERSION(reg0);
 143         else if (INVERSION_OFF == inversion)
 144                 DISABLE_INVERSION(reg0);
 145
 146         tda10021_writereg (state, 0x00, reg0 & 0xfe);
 147         tda10021_writereg (state, 0x00, reg0 | 0x01);
 148
 149         state->reg0 = reg0;
 150         return 0;
 151 }
 152
 153 static int tda10021_set_symbolrate (struct tda10021_state* state, u32 symbolrate)
 154 {
 155         s32 BDR;
 156         s32 BDRI;
 157         s16 SFIL=0;
 158         u16 NDEC = 0;
 159         u32 tmp, ratio;
 160
 161         if (symbolrate > XIN/2)
 162                 symbolrate = XIN/2;
 163         if (symbolrate < 500000)
 164                 symbolrate = 500000;
 165
 166         if (symbolrate < XIN/16) NDEC = 1;
 167         if (symbolrate < XIN/32) NDEC = 2;
 168         if (symbolrate < XIN/64) NDEC = 3;
 169
 170         if (symbolrate < (u32)(XIN/12.3)) SFIL = 1;
 171         if (symbolrate < (u32)(XIN/16))  SFIL = 0;
 172         if (symbolrate < (u32)(XIN/24.6)) SFIL = 1;
 173         if (symbolrate < (u32)(XIN/32))  SFIL = 0;
 174         if (symbolrate < (u32)(XIN/49.2)) SFIL = 1;
 175         if (symbolrate < (u32)(XIN/64))  SFIL = 0;
 176         if (symbolrate < (u32)(XIN/98.4)) SFIL = 1;
 177
 178         symbolrate <<= NDEC;
 179         ratio = (symbolrate << 4) / FIN;
 180         tmp =  ((symbolrate << 4) % FIN) << 8;
 181         ratio = (ratio << 8) + tmp / FIN;
 182         tmp = (tmp % FIN) << 8;
 183         ratio = (ratio << 8) + (tmp + FIN/2) / FIN;
 184
 185         BDR = ratio;
 186         BDRI = (((XIN << 5) / symbolrate) + 1) / 2;
 187
 188         if (BDRI > 0xFF)
 189                 BDRI = 0xFF;
 190
 191         SFIL = (SFIL << 4) | tda10021_inittab[0x0E];
 192
 193         NDEC = (NDEC << 6) | tda10021_inittab[0x03];
 194
 195         tda10021_writereg (state, 0x03, NDEC);
 196         tda10021_writereg (state, 0x0a, BDR&0xff);
 197         tda10021_writereg (state, 0x0b, (BDR>> 8)&0xff);
 198         tda10021_writereg (state, 0x0c, (BDR>>16)&0x3f);
 199
 200         tda10021_writereg (state, 0x0d, BDRI);
 201         tda10021_writereg (state, 0x0e, SFIL);
 202
 203         return 0;
 204 }
 205
 206 static int tda10021_init (struct dvb_frontend *fe)
 207 {
 208         struct tda10021_state* state = fe->demodulator_priv;
 209         int i;
 210
 211         dprintk("DVB: TDA10021(%d): init chip\n", fe->adapter->num);
 212
 213         //tda10021_writereg (fe, 0, 0);
 214
 215         for (i=0; i<tda10021_inittab_size; i++)
 216                 tda10021_writereg (state, i, tda10021_inittab[i]);
 217
 218         tda10021_writereg (state, 0x34, state->pwm);
 219
 220         //Comment by markus
 221         //0x2A[3-0] == PDIV -> P multiplaying factor (P=PDIV+1)(default 0)
 222         //0x2A[4] == BYPPLL -> Power down mode (default 1)
 223         //0x2A[5] == LCK -> PLL Lock Flag
 224         //0x2A[6] == POLAXIN -> Polarity of the input reference clock (default 0)
 225
 226         //Activate PLL
 227         tda10021_writereg(state, 0x2a, tda10021_inittab[0x2a] & 0xef);
 228
 229         if (state->config->pll_init) {
 230                 lock_tuner(state);
 231                 state->config->pll_init(fe);
 232                 unlock_tuner(state);
 233         }
 234
 235         return 0;
 236 }
 237
 238 static int tda10021_set_parameters (struct dvb_frontend *fe,
 239                             struct dvb_frontend_parameters *p)
 240 {
 241         struct tda10021_state* state = fe->demodulator_priv;
 242
 243         //table for QAM4-QAM256 ready  QAM4  QAM16 QAM32 QAM64 QAM128 QAM256
 244         //CONF
 245         static const u8 reg0x00 [] = { 0x14, 0x00, 0x04, 0x08, 0x0c,  0x10 };
 246         //AGCREF value
 247         static const u8 reg0x01 [] = { 0x78, 0x8c, 0x8c, 0x6a, 0x78,  0x5c };
 248         //LTHR value
 249         static const u8 reg0x05 [] = { 0x78, 0x87, 0x64, 0x46, 0x36,  0x26 };
 250         //MSETH
 251         static const u8 reg0x08 [] = { 0x8c, 0xa2, 0x74, 0x43, 0x34,  0x23 };
 252         //AREF
 253         static const u8 reg0x09 [] = { 0x96, 0x91, 0x96, 0x6a, 0x7e,  0x6b };
 254
 255         int qam = p->u.qam.modulation;
 256
 257         if (qam < 0 || qam > 5)
 258                 return -EINVAL;
 259
 260         //printk("tda10021: set frequency to %d qam=%d symrate=%d\n", p->frequency,qam,p->u.qam.symbol_rate);
 261
 262         lock_tuner(state);
 263         state->config->pll_set(fe, p);
 264         unlock_tuner(state);
 265
 266         tda10021_set_symbolrate (state, p->u.qam.symbol_rate);
 267         tda10021_writereg (state, 0x34, state->pwm);
 268
 269         tda10021_writereg (state, 0x01, reg0x01[qam]);
 270         tda10021_writereg (state, 0x05, reg0x05[qam]);
 271         tda10021_writereg (state, 0x08, reg0x08[qam]);
 272         tda10021_writereg (state, 0x09, reg0x09[qam]);
 273
 274         tda10021_setup_reg0 (state, reg0x00[qam], p->inversion);
 275
 276         return 0;
 277 }
 278
 279 static int tda10021_read_status(struct dvb_frontend* fe, fe_status_t* status)
 280 {
 281         struct tda10021_state* state = fe->demodulator_priv;
 282         int sync;
 283
 284         *status = 0;
 285         //0x11[0] == EQALGO -> Equalizer algorithms state
 286         //0x11[1] == CARLOCK -> Carrier locked
 287         //0x11[2] == FSYNC -> Frame synchronisation
 288         //0x11[3] == FEL -> Front End locked
 289         //0x11[6] == NODVB -> DVB Mode Information
 290         sync = tda10021_readreg (state, 0x11);
 291
 292         if (sync & 2)
 293                 *status |= FE_HAS_SIGNAL|FE_HAS_CARRIER;
 294
 295         if (sync & 4)
 296                 *status |= FE_HAS_SYNC|FE_HAS_VITERBI;
 297
 298         if (sync & 8)
 299                 *status |= FE_HAS_LOCK;
 300
 301         return 0;
 302 }
 303
 304 static int tda10021_read_ber(struct dvb_frontend* fe, u32* ber)
 305 {
 306         struct tda10021_state* state = fe->demodulator_priv;
 307
 308         u32 _ber = tda10021_readreg(state, 0x14) |
 309                 (tda10021_readreg(state, 0x15) << 8) |
 310                 ((tda10021_readreg(state, 0x16) & 0x0f) << 16);
 311         *ber = 10 * _ber;
 312
 313         return 0;
 314 }
 315
 316 static int tda10021_read_signal_strength(struct dvb_frontend* fe, u16* strength)
 317 {
 318         struct tda10021_state* state = fe->demodulator_priv;
 319
 320         u8 gain = tda10021_readreg(state, 0x17);
 321         *strength = (gain << 8) | gain;
 322
 323         return 0;
 324 }
 325
 326 static int tda10021_read_snr(struct dvb_frontend* fe, u16* snr)
 327 {
 328         struct tda10021_state* state = fe->demodulator_priv;
 329
 330         u8 quality = ~tda10021_readreg(state, 0x18);
 331         *snr = (quality << 8) | quality;
 332
 333         return 0;
 334 }
 335
 336 static int tda10021_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
 337 {
 338         struct tda10021_state* state = fe->demodulator_priv;
 339
 340         *ucblocks = tda10021_readreg (state, 0x13) & 0x7f;
 341         if (*ucblocks == 0x7f)
 342                 *ucblocks = 0xffffffff;
 343
 344         /* reset uncorrected block counter */
 345         tda10021_writereg (state, 0x10, tda10021_inittab[0x10] & 0xdf);
 346         tda10021_writereg (state, 0x10, tda10021_inittab[0x10]);
 347
 348         return 0;
 349 }
 350
 351 static int tda10021_get_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
 352 {
 353         struct tda10021_state* state = fe->demodulator_priv;
 354         int sync;
 355         s8 afc = 0;
 356
 357         sync = tda10021_readreg(state, 0x11);
 358         afc = tda10021_readreg(state, 0x19);
 359         if (verbose) {
 360                 /* AFC only valid when carrier has been recovered */
 361                 printk(sync & 2 ? "DVB: TDA10021(%d): AFC (%d) %dHz\n" :
 362                                   "DVB: TDA10021(%d): [AFC (%d) %dHz]\n",
 363                         state->frontend.dvb->num, afc,
 364                        -((s32)p->u.qam.symbol_rate * afc) >> 10);
 365         }
 366
 367         p->inversion = HAS_INVERSION(state->reg0) ? INVERSION_ON : INVERSION_OFF;
 368         p->u.qam.modulation = ((state->reg0 >> 2) & 7) + QAM_16;
 369
 370         p->u.qam.fec_inner = FEC_NONE;
 371         p->frequency = ((p->frequency + 31250) / 62500) * 62500;
 372
 373         if (sync & 2)
 374                 p->frequency -= ((s32)p->u.qam.symbol_rate * afc) >> 10;
 375
 376         return 0;
 377 }
 378
 379 static int tda10021_sleep(struct dvb_frontend* fe)
 380 {
 381         struct tda10021_state* state = fe->demodulator_priv;
 382
 383         tda10021_writereg (state, 0x1b, 0x02);  /* pdown ADC */
 384         tda10021_writereg (state, 0x00, 0x80);  /* standby */
 385
 386         return 0;
 387 }
 388
 389 static void tda10021_release(struct dvb_frontend* fe)
 390 {
 391         struct tda10021_state* state = fe->demodulator_priv;
 392         kfree(state);
 393 }
 394
 395 static struct dvb_frontend_ops tda10021_ops;
 396
 397 struct dvb_frontend* tda10021_attach(const struct tda10021_config* config,
 398                                      struct i2c_adapter* i2c,
 399                                      u8 pwm)
 400 {
 401         struct tda10021_state* state = NULL;
 402
 403         /* allocate memory for the internal state */
 404         state = kmalloc(sizeof(struct tda10021_state), GFP_KERNEL);
 405         if (state == NULL) goto error;
 406
 407         /* setup the state */
 408         state->config = config;
 409         state->i2c = i2c;
 410         memcpy(&state->ops, &tda10021_ops, sizeof(struct dvb_frontend_ops));
 411         state->pwm = pwm;
 412         state->reg0 = tda10021_inittab[0];
 413
 414         /* check if the demod is there */
 415         if ((tda10021_readreg(state, 0x1a) & 0xf0) != 0x70) goto error;
 416
 417         /* create dvb_frontend */
 418         state->frontend.ops = &state->ops;
 419         state->frontend.demodulator_priv = state;
 420         return &state->frontend;
 421
 422 error:
 423         kfree(state);
 424         return NULL;
 425 }
 426
 427 static struct dvb_frontend_ops tda10021_ops = {
 428
 429         .info = {
 430                 .name = "Philips TDA10021 DVB-C",
 431                 .type = FE_QAM,
 432                 .frequency_stepsize = 62500,
 433                 .frequency_min = 51000000,
 434                 .frequency_max = 858000000,
 435                 .symbol_rate_min = (XIN/2)/64,     /* SACLK/64 == (XIN/2)/64 */
 436                 .symbol_rate_max = (XIN/2)/4,      /* SACLK/4 */
 437 #if 0
 438                 .frequency_tolerance = ???,
 439                 .symbol_rate_tolerance = ???,  /* ppm */  /* == 8% (spec p. 5) */
 440         #endif
 441                 .caps = 0x400 | //FE_CAN_QAM_4
 442                         FE_CAN_QAM_16 | FE_CAN_QAM_32 | FE_CAN_QAM_64 |
 443                         FE_CAN_QAM_128 | FE_CAN_QAM_256 |
 444                         FE_CAN_FEC_AUTO
 445         },
 446
 447         .release = tda10021_release,
 448
 449         .init = tda10021_init,
 450         .sleep = tda10021_sleep,
 451
 452         .set_frontend = tda10021_set_parameters,
 453         .get_frontend = tda10021_get_frontend,
 454
 455         .read_status = tda10021_read_status,
 456         .read_ber = tda10021_read_ber,
 457         .read_signal_strength = tda10021_read_signal_strength,
 458         .read_snr = tda10021_read_snr,
 459         .read_ucblocks = tda10021_read_ucblocks,
 460 };
 461
 462 module_param(verbose, int, 0644);
 463 MODULE_PARM_DESC(verbose, "print AFC offset after tuning for debugging the PWM setting");
 464
 465 MODULE_DESCRIPTION("Philips TDA10021 DVB-C demodulator driver");
 466 MODULE_AUTHOR("Ralph Metzler, Holger Waechtler, Markus Schulz");
 467 MODULE_LICENSE("GPL");
 468
 469 EXPORT_SYMBOL(tda10021_attach);