drivers/media/dvb/frontends/cx22702.c

   1 /*
   2     Conexant 22702 DVB OFDM demodulator driver
   3
   4     based on:
   5         Alps TDMB7 DVB OFDM demodulator driver
   6
   7     Copyright (C) 2001-2002 Convergence Integrated Media GmbH
   8           Holger Waechtler <holger@convergence.de>
   9
  10     Copyright (C) 2004 Steven Toth <steve@toth.demon.co.uk>
  11
  12     This program is free software; you can redistribute it and/or modify
  13     it under the terms of the GNU General Public License as published by
  14     the Free Software Foundation; either version 2 of the License, or
  15     (at your option) any later version.
  16
  17     This program is distributed in the hope that it will be useful,
  18     but WITHOUT ANY WARRANTY; without even the implied warranty of
  19     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20     GNU General Public License for more details.
  21
  22     You should have received a copy of the GNU General Public License
  23     along with this program; if not, write to the Free Software
  24     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  25
  26 */
  27
  28 #include <linux/kernel.h>
  29 #include <linux/init.h>
  30 #include <linux/module.h>
  31 #include <linux/string.h>
  32 #include <linux/slab.h>
  33 #include <linux/delay.h>
  34 #include "dvb_frontend.h"
  35 #include "cx22702.h"
  36
  37
  38 struct cx22702_state {
  39
  40         struct i2c_adapter* i2c;
  41
  42         struct dvb_frontend_ops ops;
  43
  44         /* configuration settings */
  45         const struct cx22702_config* config;
  46
  47         struct dvb_frontend frontend;
  48
  49         /* previous uncorrected block counter */
  50         u8 prevUCBlocks;
  51 };
  52
  53 static int debug = 0;
  54 #define dprintk if (debug) printk
  55
  56 /* Register values to initialise the demod */
  57 static u8 init_tab [] = {
  58         0x00, 0x00, /* Stop aquisition */
  59         0x0B, 0x06,
  60         0x09, 0x01,
  61         0x0D, 0x41,
  62         0x16, 0x32,
  63         0x20, 0x0A,
  64         0x21, 0x17,
  65         0x24, 0x3e,
  66         0x26, 0xff,
  67         0x27, 0x10,
  68         0x28, 0x00,
  69         0x29, 0x00,
  70         0x2a, 0x10,
  71         0x2b, 0x00,
  72         0x2c, 0x10,
  73         0x2d, 0x00,
  74         0x48, 0xd4,
  75         0x49, 0x56,
  76         0x6b, 0x1e,
  77         0xc8, 0x02,
  78         0xf8, 0x02,
  79         0xf9, 0x00,
  80         0xfa, 0x00,
  81         0xfb, 0x00,
  82         0xfc, 0x00,
  83         0xfd, 0x00,
  84 };
  85
  86 static int cx22702_writereg (struct cx22702_state* state, u8 reg, u8 data)
  87 {
  88         int ret;
  89         u8 buf [] = { reg, data };
  90         struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 2 };
  91
  92         ret = i2c_transfer(state->i2c, &msg, 1);
  93
  94         if (ret != 1)
  95                 printk("%s: writereg error (reg == 0x%02x, val == 0x%02x, ret == %i)\n",
  96                         __FUNCTION__, reg, data, ret);
  97
  98         return (ret != 1) ? -1 : 0;
  99 }
 100
 101 static u8 cx22702_readreg (struct cx22702_state* state, u8 reg)
 102 {
 103         int ret;
 104         u8 b0 [] = { reg };
 105         u8 b1 [] = { 0 };
 106
 107         struct i2c_msg msg [] = {
 108                 { .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 1 },
 109                 { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 1 } };
 110
 111         ret = i2c_transfer(state->i2c, msg, 2);
 112
 113         if (ret != 2)
 114                 printk("%s: readreg error (ret == %i)\n", __FUNCTION__, ret);
 115
 116         return b1[0];
 117 }
 118
 119 static int cx22702_set_inversion (struct cx22702_state *state, int inversion)
 120 {
 121         u8 val;
 122
 123         switch (inversion) {
 124
 125                 case INVERSION_AUTO:
 126                         return -EOPNOTSUPP;
 127
 128                 case INVERSION_ON:
 129                         val = cx22702_readreg (state, 0x0C);
 130                         return cx22702_writereg (state, 0x0C, val | 0x01);
 131
 132                 case INVERSION_OFF:
 133                         val = cx22702_readreg (state, 0x0C);
 134                         return cx22702_writereg (state, 0x0C, val & 0xfe);
 135
 136                 default:
 137                         return -EINVAL;
 138
 139         }
 140
 141 }
 142
 143 /* Retrieve the demod settings */
 144 static int cx22702_get_tps (struct cx22702_state *state, struct dvb_ofdm_parameters *p)
 145 {
 146         u8 val;
 147
 148         /* Make sure the TPS regs are valid */
 149         if (!(cx22702_readreg(state, 0x0A) & 0x20))
 150                 return -EAGAIN;
 151
 152         val = cx22702_readreg (state, 0x01);
 153         switch( (val&0x18)>>3) {
 154                 case 0: p->constellation =   QPSK; break;
 155                 case 1: p->constellation = QAM_16; break;
 156                 case 2: p->constellation = QAM_64; break;
 157         }
 158         switch( val&0x07 ) {
 159                 case 0: p->hierarchy_information = HIERARCHY_NONE; break;
 160                 case 1: p->hierarchy_information =    HIERARCHY_1; break;
 161                 case 2: p->hierarchy_information =    HIERARCHY_2; break;
 162                 case 3: p->hierarchy_information =    HIERARCHY_4; break;
 163         }
 164
 165
 166         val = cx22702_readreg (state, 0x02);
 167         switch( (val&0x38)>>3 ) {
 168                 case 0: p->code_rate_HP = FEC_1_2; break;
 169                 case 1: p->code_rate_HP = FEC_2_3; break;
 170                 case 2: p->code_rate_HP = FEC_3_4; break;
 171                 case 3: p->code_rate_HP = FEC_5_6; break;
 172                 case 4: p->code_rate_HP = FEC_7_8; break;
 173         }
 174         switch( val&0x07 ) {
 175                 case 0: p->code_rate_LP = FEC_1_2; break;
 176                 case 1: p->code_rate_LP = FEC_2_3; break;
 177                 case 2: p->code_rate_LP = FEC_3_4; break;
 178                 case 3: p->code_rate_LP = FEC_5_6; break;
 179                 case 4: p->code_rate_LP = FEC_7_8; break;
 180         }
 181
 182
 183         val = cx22702_readreg (state, 0x03);
 184         switch( (val&0x0c)>>2 ) {
 185                 case 0: p->guard_interval = GUARD_INTERVAL_1_32; break;
 186                 case 1: p->guard_interval = GUARD_INTERVAL_1_16; break;
 187                 case 2: p->guard_interval =  GUARD_INTERVAL_1_8; break;
 188                 case 3: p->guard_interval =  GUARD_INTERVAL_1_4; break;
 189         }
 190         switch( val&0x03 ) {
 191                 case 0: p->transmission_mode = TRANSMISSION_MODE_2K; break;
 192                 case 1: p->transmission_mode = TRANSMISSION_MODE_8K; break;
 193         }
 194
 195         return 0;
 196 }
 197
 198 /* Talk to the demod, set the FEC, GUARD, QAM settings etc */
 199 static int cx22702_set_tps (struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
 200 {
 201         u8 val;
 202         struct cx22702_state* state = (struct cx22702_state*) fe->demodulator_priv;
 203
 204         /* set PLL */
 205         cx22702_writereg (state, 0x0D, cx22702_readreg(state,0x0D) &0xfe);
 206         state->config->pll_set(fe, p);
 207         cx22702_writereg (state, 0x0D, cx22702_readreg(state,0x0D) | 1);
 208
 209         /* set inversion */
 210         cx22702_set_inversion (state, p->inversion);
 211
 212         /* set bandwidth */
 213         switch(p->u.ofdm.bandwidth) {
 214         case BANDWIDTH_6_MHZ:
 215                 cx22702_writereg(state, 0x0C, (cx22702_readreg(state, 0x0C) & 0xcf) | 0x20 );
 216                 break;
 217         case BANDWIDTH_7_MHZ:
 218                 cx22702_writereg(state, 0x0C, (cx22702_readreg(state, 0x0C) & 0xcf) | 0x10 );
 219                 break;
 220         case BANDWIDTH_8_MHZ:
 221                 cx22702_writereg(state, 0x0C, cx22702_readreg(state, 0x0C) &0xcf );
 222                 break;
 223         default:
 224                 dprintk ("%s: invalid bandwidth\n",__FUNCTION__);
 225                 return -EINVAL;
 226         }
 227
 228
 229         p->u.ofdm.code_rate_LP = FEC_AUTO; //temp hack as manual not working
 230
 231         /* use auto configuration? */
 232         if((p->u.ofdm.hierarchy_information==HIERARCHY_AUTO) ||
 233            (p->u.ofdm.constellation==QAM_AUTO) ||
 234            (p->u.ofdm.code_rate_HP==FEC_AUTO) ||
 235            (p->u.ofdm.code_rate_LP==FEC_AUTO) ||
 236            (p->u.ofdm.guard_interval==GUARD_INTERVAL_AUTO) ||
 237            (p->u.ofdm.transmission_mode==TRANSMISSION_MODE_AUTO) ) {
 238
 239                 /* TPS Source - use hardware driven values */
 240                 cx22702_writereg(state, 0x06, 0x10);
 241                 cx22702_writereg(state, 0x07, 0x9);
 242                 cx22702_writereg(state, 0x08, 0xC1);
 243                 cx22702_writereg(state, 0x0B, cx22702_readreg(state, 0x0B) & 0xfc );
 244                 cx22702_writereg(state, 0x0C, (cx22702_readreg(state, 0x0C) & 0xBF) | 0x40 );
 245                 cx22702_writereg(state, 0x00, 0x01); /* Begin aquisition */
 246                 printk("%s: Autodetecting\n",__FUNCTION__);
 247                 return 0;
 248         }
 249
 250         /* manually programmed values */
 251         val=0;
 252         switch(p->u.ofdm.constellation) {
 253                 case   QPSK: val = (val&0xe7); break;
 254                 case QAM_16: val = (val&0xe7)|0x08; break;
 255                 case QAM_64: val = (val&0xe7)|0x10; break;
 256                 default:
 257                         dprintk ("%s: invalid constellation\n",__FUNCTION__);
 258                         return -EINVAL;
 259         }
 260         switch(p->u.ofdm.hierarchy_information) {
 261                 case HIERARCHY_NONE: val = (val&0xf8); break;
 262                 case    HIERARCHY_1: val = (val&0xf8)|1; break;
 263                 case    HIERARCHY_2: val = (val&0xf8)|2; break;
 264                 case    HIERARCHY_4: val = (val&0xf8)|3; break;
 265                 default:
 266                         dprintk ("%s: invalid hierarchy\n",__FUNCTION__);
 267                         return -EINVAL;
 268         }
 269         cx22702_writereg (state, 0x06, val);
 270
 271         val=0;
 272         switch(p->u.ofdm.code_rate_HP) {
 273                 case FEC_NONE:
 274                 case FEC_1_2: val = (val&0xc7); break;
 275                 case FEC_2_3: val = (val&0xc7)|0x08; break;
 276                 case FEC_3_4: val = (val&0xc7)|0x10; break;
 277                 case FEC_5_6: val = (val&0xc7)|0x18; break;
 278                 case FEC_7_8: val = (val&0xc7)|0x20; break;
 279                 default:
 280                         dprintk ("%s: invalid code_rate_HP\n",__FUNCTION__);
 281                         return -EINVAL;
 282         }
 283         switch(p->u.ofdm.code_rate_LP) {
 284                 case FEC_NONE:
 285                 case FEC_1_2: val = (val&0xf8); break;
 286                 case FEC_2_3: val = (val&0xf8)|1; break;
 287                 case FEC_3_4: val = (val&0xf8)|2; break;
 288                 case FEC_5_6: val = (val&0xf8)|3; break;
 289                 case FEC_7_8: val = (val&0xf8)|4; break;
 290                 default:
 291                         dprintk ("%s: invalid code_rate_LP\n",__FUNCTION__);
 292                         return -EINVAL;
 293         }
 294         cx22702_writereg (state, 0x07, val);
 295
 296         val=0;
 297         switch(p->u.ofdm.guard_interval) {
 298                 case GUARD_INTERVAL_1_32: val = (val&0xf3); break;
 299                 case GUARD_INTERVAL_1_16: val = (val&0xf3)|0x04; break;
 300                 case  GUARD_INTERVAL_1_8: val = (val&0xf3)|0x08; break;
 301                 case  GUARD_INTERVAL_1_4: val = (val&0xf3)|0x0c; break;
 302                 default:
 303                         dprintk ("%s: invalid guard_interval\n",__FUNCTION__);
 304                         return -EINVAL;
 305         }
 306         switch(p->u.ofdm.transmission_mode) {
 307                 case TRANSMISSION_MODE_2K: val = (val&0xfc); break;
 308                 case TRANSMISSION_MODE_8K: val = (val&0xfc)|1; break;
 309                 default:
 310                         dprintk ("%s: invalid transmission_mode\n",__FUNCTION__);
 311                         return -EINVAL;
 312         }
 313         cx22702_writereg(state, 0x08, val);
 314         cx22702_writereg(state, 0x0B, (cx22702_readreg(state, 0x0B) & 0xfc) | 0x02 );
 315         cx22702_writereg(state, 0x0C, (cx22702_readreg(state, 0x0C) & 0xBF) | 0x40 );
 316
 317         /* Begin channel aquisition */
 318         cx22702_writereg(state, 0x00, 0x01);
 319
 320         return 0;
 321 }
 322
 323 /* Reset the demod hardware and reset all of the configuration registers
 324    to a default state. */
 325 static int cx22702_init (struct dvb_frontend* fe)
 326 {
 327         int i;
 328         struct cx22702_state* state = (struct cx22702_state*) fe->demodulator_priv;
 329
 330         cx22702_writereg (state, 0x00, 0x02);
 331
 332         msleep(10);
 333
 334         for (i=0; i<sizeof(init_tab); i+=2)
 335                 cx22702_writereg (state, init_tab[i], init_tab[i+1]);
 336
 337
 338         /* init PLL */
 339         if (state->config->pll_init) {
 340                 cx22702_writereg (state, 0x0D, cx22702_readreg(state,0x0D) &0xfe);
 341                 state->config->pll_init(fe);
 342                 cx22702_writereg (state, 0x0D, cx22702_readreg(state,0x0D) | 1);
 343         }
 344
 345         return 0;
 346 }
 347
 348 static int cx22702_read_status(struct dvb_frontend* fe, fe_status_t* status)
 349 {
 350         struct cx22702_state* state = (struct cx22702_state*) fe->demodulator_priv;
 351         u8 reg0A;
 352         u8 reg23;
 353
 354         *status = 0;
 355
 356         reg0A = cx22702_readreg (state, 0x0A);
 357         reg23 = cx22702_readreg (state, 0x23);
 358
 359         dprintk ("%s: status demod=0x%02x agc=0x%02x\n"
 360                 ,__FUNCTION__,reg0A,reg23);
 361
 362         if(reg0A & 0x10) {
 363                 *status |= FE_HAS_LOCK;
 364                 *status |= FE_HAS_VITERBI;
 365                 *status |= FE_HAS_SYNC;
 366         }
 367
 368         if(reg0A & 0x20)
 369                 *status |= FE_HAS_CARRIER;
 370
 371         if(reg23 < 0xf0)
 372                 *status |= FE_HAS_SIGNAL;
 373
 374         return 0;
 375 }
 376
 377 static int cx22702_read_ber(struct dvb_frontend* fe, u32* ber)
 378 {
 379         struct cx22702_state* state = (struct cx22702_state*) fe->demodulator_priv;
 380
 381         if(cx22702_readreg (state, 0xE4) & 0x02) {
 382                 /* Realtime statistics */
 383                 *ber = (cx22702_readreg (state, 0xDE) & 0x7F) << 7
 384                         | (cx22702_readreg (state, 0xDF)&0x7F);
 385         } else {
 386                 /* Averagtine statistics */
 387                 *ber = (cx22702_readreg (state, 0xDE) & 0x7F) << 7
 388                         | cx22702_readreg (state, 0xDF);
 389         }
 390
 391         return 0;
 392 }
 393
 394 static int cx22702_read_signal_strength(struct dvb_frontend* fe, u16* signal_strength)
 395 {
 396         struct cx22702_state* state = (struct cx22702_state*) fe->demodulator_priv;
 397
 398         *signal_strength = cx22702_readreg (state, 0x23);
 399
 400         return 0;
 401 }
 402
 403 static int cx22702_read_snr(struct dvb_frontend* fe, u16* snr)
 404 {
 405         struct cx22702_state* state = (struct cx22702_state*) fe->demodulator_priv;
 406
 407         u16 rs_ber=0;
 408         if(cx22702_readreg (state, 0xE4) & 0x02) {
 409                 /* Realtime statistics */
 410                 rs_ber = (cx22702_readreg (state, 0xDE) & 0x7F) << 7
 411                         | (cx22702_readreg (state, 0xDF)& 0x7F);
 412         } else {
 413                 /* Averagine statistics */
 414                 rs_ber = (cx22702_readreg (state, 0xDE) & 0x7F) << 8
 415                         | cx22702_readreg (state, 0xDF);
 416         }
 417         *snr = ~rs_ber;
 418
 419         return 0;
 420 }
 421
 422 static int cx22702_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
 423 {
 424         struct cx22702_state* state = (struct cx22702_state*) fe->demodulator_priv;
 425
 426         u8 _ucblocks;
 427
 428         /* RS Uncorrectable Packet Count then reset */
 429         _ucblocks = cx22702_readreg (state, 0xE3);
 430         if (state->prevUCBlocks < _ucblocks) *ucblocks = (_ucblocks - state->prevUCBlocks);
 431         else *ucblocks = state->prevUCBlocks - _ucblocks;
 432         state->prevUCBlocks = _ucblocks;
 433
 434         return 0;
 435 }
 436
 437 static int cx22702_get_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
 438 {
 439         struct cx22702_state* state = (struct cx22702_state*) fe->demodulator_priv;
 440
 441         u8 reg0C = cx22702_readreg (state, 0x0C);
 442
 443         p->inversion = reg0C & 0x1 ? INVERSION_ON : INVERSION_OFF;
 444         return cx22702_get_tps (state, &p->u.ofdm);
 445 }
 446
 447 static void cx22702_release(struct dvb_frontend* fe)
 448 {
 449         struct cx22702_state* state = (struct cx22702_state*) fe->demodulator_priv;
 450         kfree(state);
 451 }
 452
 453 static struct dvb_frontend_ops cx22702_ops;
 454
 455 struct dvb_frontend* cx22702_attach(const struct cx22702_config* config,
 456                                     struct i2c_adapter* i2c)
 457 {
 458         struct cx22702_state* state = NULL;
 459
 460         /* allocate memory for the internal state */
 461         state = (struct cx22702_state*) kmalloc(sizeof(struct cx22702_state), GFP_KERNEL);
 462         if (state == NULL) goto error;
 463
 464         /* setup the state */
 465         state->config = config;
 466         state->i2c = i2c;
 467         memcpy(&state->ops, &cx22702_ops, sizeof(struct dvb_frontend_ops));
 468         state->prevUCBlocks = 0;
 469
 470         /* check if the demod is there */
 471         if (cx22702_readreg(state, 0x1f) != 0x3) goto error;
 472
 473         /* create dvb_frontend */
 474         state->frontend.ops = &state->ops;
 475         state->frontend.demodulator_priv = state;
 476         return &state->frontend;
 477
 478 error:
 479         kfree(state);
 480         return NULL;
 481 }
 482
 483 static struct dvb_frontend_ops cx22702_ops = {
 484
 485         .info = {
 486                 .name                   = "Conexant CX22702 DVB-T",
 487                 .type                   = FE_OFDM,
 488                 .frequency_min          = 177000000,
 489                 .frequency_max          = 858000000,
 490                 .frequency_stepsize     = 166666,
 491                 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 492                 FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
 493                 FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
 494                 FE_CAN_HIERARCHY_AUTO | FE_CAN_GUARD_INTERVAL_AUTO |
 495                 FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_RECOVER
 496         },
 497
 498         .release = cx22702_release,
 499
 500         .init = cx22702_init,
 501
 502         .set_frontend = cx22702_set_tps,
 503         .get_frontend = cx22702_get_frontend,
 504
 505         .read_status = cx22702_read_status,
 506         .read_ber = cx22702_read_ber,
 507         .read_signal_strength = cx22702_read_signal_strength,
 508         .read_snr = cx22702_read_snr,
 509         .read_ucblocks = cx22702_read_ucblocks,
 510 };
 511
 512 module_param(debug, int, 0644);
 513 MODULE_PARM_DESC(debug, "Enable verbose debug messages");
 514
 515 MODULE_DESCRIPTION("Conexant CX22702 DVB-T Demodulator driver");
 516 MODULE_AUTHOR("Steven Toth");
 517 MODULE_LICENSE("GPL");
 518
 519 EXPORT_SYMBOL(cx22702_attach);