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 <stoth@hauppauge.com>
  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         /* configuration settings */
  43         const struct cx22702_config* config;
  44
  45         struct dvb_frontend frontend;
  46
  47         /* previous uncorrected block counter */
  48         u8 prevUCBlocks;
  49 };
  50
  51 static int debug = 0;
  52 #define dprintk if (debug) printk
  53
  54 /* Register values to initialise the demod */
  55 static u8 init_tab [] = {
  56         0x00, 0x00, /* Stop aquisition */
  57         0x0B, 0x06,
  58         0x09, 0x01,
  59         0x0D, 0x41,
  60         0x16, 0x32,
  61         0x20, 0x0A,
  62         0x21, 0x17,
  63         0x24, 0x3e,
  64         0x26, 0xff,
  65         0x27, 0x10,
  66         0x28, 0x00,
  67         0x29, 0x00,
  68         0x2a, 0x10,
  69         0x2b, 0x00,
  70         0x2c, 0x10,
  71         0x2d, 0x00,
  72         0x48, 0xd4,
  73         0x49, 0x56,
  74         0x6b, 0x1e,
  75         0xc8, 0x02,
  76         0xf9, 0x00,
  77         0xfa, 0x00,
  78         0xfb, 0x00,
  79         0xfc, 0x00,
  80         0xfd, 0x00,
  81 };
  82
  83 static int cx22702_writereg (struct cx22702_state* state, u8 reg, u8 data)
  84 {
  85         int ret;
  86         u8 buf [] = { reg, data };
  87         struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 2 };
  88
  89         ret = i2c_transfer(state->i2c, &msg, 1);
  90
  91         if (ret != 1)
  92                 printk("%s: writereg error (reg == 0x%02x, val == 0x%02x, ret == %i)\n",
  93                         __FUNCTION__, reg, data, ret);
  94
  95         return (ret != 1) ? -1 : 0;
  96 }
  97
  98 static u8 cx22702_readreg (struct cx22702_state* state, u8 reg)
  99 {
 100         int ret;
 101         u8 b0 [] = { reg };
 102         u8 b1 [] = { 0 };
 103
 104         struct i2c_msg msg [] = {
 105                 { .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 1 },
 106                 { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 1 } };
 107
 108         ret = i2c_transfer(state->i2c, msg, 2);
 109
 110         if (ret != 2)
 111                 printk("%s: readreg error (ret == %i)\n", __FUNCTION__, ret);
 112
 113         return b1[0];
 114 }
 115
 116 static int cx22702_set_inversion (struct cx22702_state *state, int inversion)
 117 {
 118         u8 val;
 119
 120         switch (inversion) {
 121
 122                 case INVERSION_AUTO:
 123                         return -EOPNOTSUPP;
 124
 125                 case INVERSION_ON:
 126                         val = cx22702_readreg (state, 0x0C);
 127                         return cx22702_writereg (state, 0x0C, val | 0x01);
 128
 129                 case INVERSION_OFF:
 130                         val = cx22702_readreg (state, 0x0C);
 131                         return cx22702_writereg (state, 0x0C, val & 0xfe);
 132
 133                 default:
 134                         return -EINVAL;
 135
 136         }
 137
 138 }
 139
 140 /* Retrieve the demod settings */
 141 static int cx22702_get_tps (struct cx22702_state *state, struct dvb_ofdm_parameters *p)
 142 {
 143         u8 val;
 144
 145         /* Make sure the TPS regs are valid */
 146         if (!(cx22702_readreg(state, 0x0A) & 0x20))
 147                 return -EAGAIN;
 148
 149         val = cx22702_readreg (state, 0x01);
 150         switch( (val&0x18)>>3) {
 151                 case 0: p->constellation =   QPSK; break;
 152                 case 1: p->constellation = QAM_16; break;
 153                 case 2: p->constellation = QAM_64; break;
 154         }
 155         switch( val&0x07 ) {
 156                 case 0: p->hierarchy_information = HIERARCHY_NONE; break;
 157                 case 1: p->hierarchy_information =    HIERARCHY_1; break;
 158                 case 2: p->hierarchy_information =    HIERARCHY_2; break;
 159                 case 3: p->hierarchy_information =    HIERARCHY_4; break;
 160         }
 161
 162
 163         val = cx22702_readreg (state, 0x02);
 164         switch( (val&0x38)>>3 ) {
 165                 case 0: p->code_rate_HP = FEC_1_2; break;
 166                 case 1: p->code_rate_HP = FEC_2_3; break;
 167                 case 2: p->code_rate_HP = FEC_3_4; break;
 168                 case 3: p->code_rate_HP = FEC_5_6; break;
 169                 case 4: p->code_rate_HP = FEC_7_8; break;
 170         }
 171         switch( val&0x07 ) {
 172                 case 0: p->code_rate_LP = FEC_1_2; break;
 173                 case 1: p->code_rate_LP = FEC_2_3; break;
 174                 case 2: p->code_rate_LP = FEC_3_4; break;
 175                 case 3: p->code_rate_LP = FEC_5_6; break;
 176                 case 4: p->code_rate_LP = FEC_7_8; break;
 177         }
 178
 179
 180         val = cx22702_readreg (state, 0x03);
 181         switch( (val&0x0c)>>2 ) {
 182                 case 0: p->guard_interval = GUARD_INTERVAL_1_32; break;
 183                 case 1: p->guard_interval = GUARD_INTERVAL_1_16; break;
 184                 case 2: p->guard_interval =  GUARD_INTERVAL_1_8; break;
 185                 case 3: p->guard_interval =  GUARD_INTERVAL_1_4; break;
 186         }
 187         switch( val&0x03 ) {
 188                 case 0: p->transmission_mode = TRANSMISSION_MODE_2K; break;
 189                 case 1: p->transmission_mode = TRANSMISSION_MODE_8K; break;
 190         }
 191
 192         return 0;
 193 }
 194
 195 static int cx22702_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
 196 {
 197         struct cx22702_state* state = fe->demodulator_priv;
 198         dprintk ("%s(%d)\n", __FUNCTION__, enable);
 199         if (enable)
 200                 return cx22702_writereg (state, 0x0D, cx22702_readreg(state, 0x0D) & 0xfe);
 201         else
 202                 return cx22702_writereg (state, 0x0D, cx22702_readreg(state, 0x0D) | 1);
 203 }
 204
 205 /* Talk to the demod, set the FEC, GUARD, QAM settings etc */
 206 static int cx22702_set_tps (struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
 207 {
 208         u8 val;
 209         struct cx22702_state* state = fe->demodulator_priv;
 210
 211         if (fe->ops.tuner_ops.set_params) {
 212                 fe->ops.tuner_ops.set_params(fe, p);
 213                 if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
 214         }
 215
 216         /* set inversion */
 217         cx22702_set_inversion (state, p->inversion);
 218
 219         /* set bandwidth */
 220         switch(p->u.ofdm.bandwidth) {
 221         case BANDWIDTH_6_MHZ:
 222                 cx22702_writereg(state, 0x0C, (cx22702_readreg(state, 0x0C) & 0xcf) | 0x20 );
 223                 break;
 224         case BANDWIDTH_7_MHZ:
 225                 cx22702_writereg(state, 0x0C, (cx22702_readreg(state, 0x0C) & 0xcf) | 0x10 );
 226                 break;
 227         case BANDWIDTH_8_MHZ:
 228                 cx22702_writereg(state, 0x0C, cx22702_readreg(state, 0x0C) &0xcf );
 229                 break;
 230         default:
 231                 dprintk ("%s: invalid bandwidth\n",__FUNCTION__);
 232                 return -EINVAL;
 233         }
 234
 235
 236         p->u.ofdm.code_rate_LP = FEC_AUTO; //temp hack as manual not working
 237
 238         /* use auto configuration? */
 239         if((p->u.ofdm.hierarchy_information==HIERARCHY_AUTO) ||
 240            (p->u.ofdm.constellation==QAM_AUTO) ||
 241            (p->u.ofdm.code_rate_HP==FEC_AUTO) ||
 242            (p->u.ofdm.code_rate_LP==FEC_AUTO) ||
 243            (p->u.ofdm.guard_interval==GUARD_INTERVAL_AUTO) ||
 244            (p->u.ofdm.transmission_mode==TRANSMISSION_MODE_AUTO) ) {
 245
 246                 /* TPS Source - use hardware driven values */
 247                 cx22702_writereg(state, 0x06, 0x10);
 248                 cx22702_writereg(state, 0x07, 0x9);
 249                 cx22702_writereg(state, 0x08, 0xC1);
 250                 cx22702_writereg(state, 0x0B, cx22702_readreg(state, 0x0B) & 0xfc );
 251                 cx22702_writereg(state, 0x0C, (cx22702_readreg(state, 0x0C) & 0xBF) | 0x40 );
 252                 cx22702_writereg(state, 0x00, 0x01); /* Begin aquisition */
 253                 dprintk("%s: Autodetecting\n",__FUNCTION__);
 254                 return 0;
 255         }
 256
 257         /* manually programmed values */
 258         val=0;
 259         switch(p->u.ofdm.constellation) {
 260                 case   QPSK: val = (val&0xe7); break;
 261                 case QAM_16: val = (val&0xe7)|0x08; break;
 262                 case QAM_64: val = (val&0xe7)|0x10; break;
 263                 default:
 264                         dprintk ("%s: invalid constellation\n",__FUNCTION__);
 265                         return -EINVAL;
 266         }
 267         switch(p->u.ofdm.hierarchy_information) {
 268                 case HIERARCHY_NONE: val = (val&0xf8); break;
 269                 case    HIERARCHY_1: val = (val&0xf8)|1; break;
 270                 case    HIERARCHY_2: val = (val&0xf8)|2; break;
 271                 case    HIERARCHY_4: val = (val&0xf8)|3; break;
 272                 default:
 273                         dprintk ("%s: invalid hierarchy\n",__FUNCTION__);
 274                         return -EINVAL;
 275         }
 276         cx22702_writereg (state, 0x06, val);
 277
 278         val=0;
 279         switch(p->u.ofdm.code_rate_HP) {
 280                 case FEC_NONE:
 281                 case FEC_1_2: val = (val&0xc7); break;
 282                 case FEC_2_3: val = (val&0xc7)|0x08; break;
 283                 case FEC_3_4: val = (val&0xc7)|0x10; break;
 284                 case FEC_5_6: val = (val&0xc7)|0x18; break;
 285                 case FEC_7_8: val = (val&0xc7)|0x20; break;
 286                 default:
 287                         dprintk ("%s: invalid code_rate_HP\n",__FUNCTION__);
 288                         return -EINVAL;
 289         }
 290         switch(p->u.ofdm.code_rate_LP) {
 291                 case FEC_NONE:
 292                 case FEC_1_2: val = (val&0xf8); break;
 293                 case FEC_2_3: val = (val&0xf8)|1; break;
 294                 case FEC_3_4: val = (val&0xf8)|2; break;
 295                 case FEC_5_6: val = (val&0xf8)|3; break;
 296                 case FEC_7_8: val = (val&0xf8)|4; break;
 297                 default:
 298                         dprintk ("%s: invalid code_rate_LP\n",__FUNCTION__);
 299                         return -EINVAL;
 300         }
 301         cx22702_writereg (state, 0x07, val);
 302
 303         val=0;
 304         switch(p->u.ofdm.guard_interval) {
 305                 case GUARD_INTERVAL_1_32: val = (val&0xf3); break;
 306                 case GUARD_INTERVAL_1_16: val = (val&0xf3)|0x04; break;
 307                 case  GUARD_INTERVAL_1_8: val = (val&0xf3)|0x08; break;
 308                 case  GUARD_INTERVAL_1_4: val = (val&0xf3)|0x0c; break;
 309                 default:
 310                         dprintk ("%s: invalid guard_interval\n",__FUNCTION__);
 311                         return -EINVAL;
 312         }
 313         switch(p->u.ofdm.transmission_mode) {
 314                 case TRANSMISSION_MODE_2K: val = (val&0xfc); break;
 315                 case TRANSMISSION_MODE_8K: val = (val&0xfc)|1; break;
 316                 default:
 317                         dprintk ("%s: invalid transmission_mode\n",__FUNCTION__);
 318                         return -EINVAL;
 319         }
 320         cx22702_writereg(state, 0x08, val);
 321         cx22702_writereg(state, 0x0B, (cx22702_readreg(state, 0x0B) & 0xfc) | 0x02 );
 322         cx22702_writereg(state, 0x0C, (cx22702_readreg(state, 0x0C) & 0xBF) | 0x40 );
 323
 324         /* Begin channel aquisition */
 325         cx22702_writereg(state, 0x00, 0x01);
 326
 327         return 0;
 328 }
 329
 330 /* Reset the demod hardware and reset all of the configuration registers
 331    to a default state. */
 332 static int cx22702_init (struct dvb_frontend* fe)
 333 {
 334         int i;
 335         struct cx22702_state* state = fe->demodulator_priv;
 336
 337         cx22702_writereg (state, 0x00, 0x02);
 338
 339         msleep(10);
 340
 341         for (i=0; i<sizeof(init_tab); i+=2)
 342                 cx22702_writereg (state, init_tab[i], init_tab[i+1]);
 343
 344         cx22702_writereg (state, 0xf8, (state->config->output_mode << 1) & 0x02);
 345
 346         cx22702_i2c_gate_ctrl(fe, 0);
 347
 348         return 0;
 349 }
 350
 351 static int cx22702_read_status(struct dvb_frontend* fe, fe_status_t* status)
 352 {
 353         struct cx22702_state* state = fe->demodulator_priv;
 354         u8 reg0A;
 355         u8 reg23;
 356
 357         *status = 0;
 358
 359         reg0A = cx22702_readreg (state, 0x0A);
 360         reg23 = cx22702_readreg (state, 0x23);
 361
 362         dprintk ("%s: status demod=0x%02x agc=0x%02x\n"
 363                 ,__FUNCTION__,reg0A,reg23);
 364
 365         if(reg0A & 0x10) {
 366                 *status |= FE_HAS_LOCK;
 367                 *status |= FE_HAS_VITERBI;
 368                 *status |= FE_HAS_SYNC;
 369         }
 370
 371         if(reg0A & 0x20)
 372                 *status |= FE_HAS_CARRIER;
 373
 374         if(reg23 < 0xf0)
 375                 *status |= FE_HAS_SIGNAL;
 376
 377         return 0;
 378 }
 379
 380 static int cx22702_read_ber(struct dvb_frontend* fe, u32* ber)
 381 {
 382         struct cx22702_state* state = fe->demodulator_priv;
 383
 384         if(cx22702_readreg (state, 0xE4) & 0x02) {
 385                 /* Realtime statistics */
 386                 *ber = (cx22702_readreg (state, 0xDE) & 0x7F) << 7
 387                         | (cx22702_readreg (state, 0xDF)&0x7F);
 388         } else {
 389                 /* Averagtine statistics */
 390                 *ber = (cx22702_readreg (state, 0xDE) & 0x7F) << 7
 391                         | cx22702_readreg (state, 0xDF);
 392         }
 393
 394         return 0;
 395 }
 396
 397 static int cx22702_read_signal_strength(struct dvb_frontend* fe, u16* signal_strength)
 398 {
 399         struct cx22702_state* state = fe->demodulator_priv;
 400
 401         u16 rs_ber = 0;
 402         rs_ber = cx22702_readreg (state, 0x23);
 403         *signal_strength = (rs_ber << 8) | rs_ber;
 404
 405         return 0;
 406 }
 407
 408 static int cx22702_read_snr(struct dvb_frontend* fe, u16* snr)
 409 {
 410         struct cx22702_state* state = fe->demodulator_priv;
 411
 412         u16 rs_ber=0;
 413         if(cx22702_readreg (state, 0xE4) & 0x02) {
 414                 /* Realtime statistics */
 415                 rs_ber = (cx22702_readreg (state, 0xDE) & 0x7F) << 7
 416                         | (cx22702_readreg (state, 0xDF)& 0x7F);
 417         } else {
 418                 /* Averagine statistics */
 419                 rs_ber = (cx22702_readreg (state, 0xDE) & 0x7F) << 8
 420                         | cx22702_readreg (state, 0xDF);
 421         }
 422         *snr = ~rs_ber;
 423
 424         return 0;
 425 }
 426
 427 static int cx22702_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
 428 {
 429         struct cx22702_state* state = fe->demodulator_priv;
 430
 431         u8 _ucblocks;
 432
 433         /* RS Uncorrectable Packet Count then reset */
 434         _ucblocks = cx22702_readreg (state, 0xE3);
 435         if (state->prevUCBlocks < _ucblocks)
 436                 *ucblocks = (_ucblocks - state->prevUCBlocks);
 437         else
 438                 *ucblocks = state->prevUCBlocks - _ucblocks;
 439         state->prevUCBlocks = _ucblocks;
 440
 441         return 0;
 442 }
 443
 444 static int cx22702_get_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
 445 {
 446         struct cx22702_state* state = fe->demodulator_priv;
 447
 448         u8 reg0C = cx22702_readreg (state, 0x0C);
 449
 450         p->inversion = reg0C & 0x1 ? INVERSION_ON : INVERSION_OFF;
 451         return cx22702_get_tps (state, &p->u.ofdm);
 452 }
 453
 454 static int cx22702_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune)
 455 {
 456         tune->min_delay_ms = 1000;
 457         return 0;
 458 }
 459
 460 static void cx22702_release(struct dvb_frontend* fe)
 461 {
 462         struct cx22702_state* state = fe->demodulator_priv;
 463         kfree(state);
 464 }
 465
 466 static struct dvb_frontend_ops cx22702_ops;
 467
 468 struct dvb_frontend* cx22702_attach(const struct cx22702_config* config,
 469                                     struct i2c_adapter* i2c)
 470 {
 471         struct cx22702_state* state = NULL;
 472
 473         /* allocate memory for the internal state */
 474         state = kmalloc(sizeof(struct cx22702_state), GFP_KERNEL);
 475         if (state == NULL)
 476                 goto error;
 477
 478         /* setup the state */
 479         state->config = config;
 480         state->i2c = i2c;
 481         state->prevUCBlocks = 0;
 482
 483         /* check if the demod is there */
 484         if (cx22702_readreg(state, 0x1f) != 0x3)
 485                 goto error;
 486
 487         /* create dvb_frontend */
 488         memcpy(&state->frontend.ops, &cx22702_ops, sizeof(struct dvb_frontend_ops));
 489         state->frontend.demodulator_priv = state;
 490         return &state->frontend;
 491
 492 error:
 493         kfree(state);
 494         return NULL;
 495 }
 496
 497 static struct dvb_frontend_ops cx22702_ops = {
 498
 499         .info = {
 500                 .name                   = "Conexant CX22702 DVB-T",
 501                 .type                   = FE_OFDM,
 502                 .frequency_min          = 177000000,
 503                 .frequency_max          = 858000000,
 504                 .frequency_stepsize     = 166666,
 505                 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 506                 FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
 507                 FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
 508                 FE_CAN_HIERARCHY_AUTO | FE_CAN_GUARD_INTERVAL_AUTO |
 509                 FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_RECOVER
 510         },
 511
 512         .release = cx22702_release,
 513
 514         .init = cx22702_init,
 515         .i2c_gate_ctrl = cx22702_i2c_gate_ctrl,
 516
 517         .set_frontend = cx22702_set_tps,
 518         .get_frontend = cx22702_get_frontend,
 519         .get_tune_settings = cx22702_get_tune_settings,
 520
 521         .read_status = cx22702_read_status,
 522         .read_ber = cx22702_read_ber,
 523         .read_signal_strength = cx22702_read_signal_strength,
 524         .read_snr = cx22702_read_snr,
 525         .read_ucblocks = cx22702_read_ucblocks,
 526 };
 527
 528 module_param(debug, int, 0644);
 529 MODULE_PARM_DESC(debug, "Enable verbose debug messages");
 530
 531 MODULE_DESCRIPTION("Conexant CX22702 DVB-T Demodulator driver");
 532 MODULE_AUTHOR("Steven Toth");
 533 MODULE_LICENSE("GPL");
 534
 535 EXPORT_SYMBOL(cx22702_attach);