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 "dvb-pll.h"
  36 #include "cx22702.h"
  37
  38
  39 struct cx22702_state {
  40
  41         struct i2c_adapter* i2c;
  42
  43         struct dvb_frontend_ops ops;
  44
  45         /* configuration settings */
  46         const struct cx22702_config* config;
  47
  48         struct dvb_frontend frontend;
  49
  50         /* previous uncorrected block counter */
  51         u8 prevUCBlocks;
  52 };
  53
  54 static int debug = 0;
  55 #define dprintk if (debug) printk
  56
  57 /* Register values to initialise the demod */
  58 static u8 init_tab [] = {
  59         0x00, 0x00, /* Stop aquisition */
  60         0x0B, 0x06,
  61         0x09, 0x01,
  62         0x0D, 0x41,
  63         0x16, 0x32,
  64         0x20, 0x0A,
  65         0x21, 0x17,
  66         0x24, 0x3e,
  67         0x26, 0xff,
  68         0x27, 0x10,
  69         0x28, 0x00,
  70         0x29, 0x00,
  71         0x2a, 0x10,
  72         0x2b, 0x00,
  73         0x2c, 0x10,
  74         0x2d, 0x00,
  75         0x48, 0xd4,
  76         0x49, 0x56,
  77         0x6b, 0x1e,
  78         0xc8, 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 static int cx22702_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
 199 {
 200         struct cx22702_state* state = fe->demodulator_priv;
 201         dprintk ("%s(%d)\n", __FUNCTION__, enable);
 202         if (enable)
 203                 return cx22702_writereg (state, 0x0D, cx22702_readreg(state, 0x0D) & 0xfe);
 204         else
 205                 return cx22702_writereg (state, 0x0D, cx22702_readreg(state, 0x0D) | 1);
 206 }
 207
 208 /* Talk to the demod, set the FEC, GUARD, QAM settings etc */
 209 static int cx22702_set_tps (struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
 210 {
 211         u8 val;
 212         struct cx22702_state* state = fe->demodulator_priv;
 213
 214         /* set PLL */
 215         cx22702_i2c_gate_ctrl(fe, 1);
 216         if (state->config->pll_set) {
 217                 state->config->pll_set(fe, p);
 218         } else if (state->config->pll_desc) {
 219                 u8 pllbuf[4];
 220                 struct i2c_msg msg = { .addr = state->config->pll_address,
 221                                        .buf = pllbuf, .len = 4 };
 222                 dvb_pll_configure(state->config->pll_desc, pllbuf,
 223                                   p->frequency,
 224                                   p->u.ofdm.bandwidth);
 225                 i2c_transfer(state->i2c, &msg, 1);
 226         } else {
 227                 BUG();
 228         }
 229         cx22702_i2c_gate_ctrl(fe, 0);
 230
 231         /* set inversion */
 232         cx22702_set_inversion (state, p->inversion);
 233
 234         /* set bandwidth */
 235         switch(p->u.ofdm.bandwidth) {
 236         case BANDWIDTH_6_MHZ:
 237                 cx22702_writereg(state, 0x0C, (cx22702_readreg(state, 0x0C) & 0xcf) | 0x20 );
 238                 break;
 239         case BANDWIDTH_7_MHZ:
 240                 cx22702_writereg(state, 0x0C, (cx22702_readreg(state, 0x0C) & 0xcf) | 0x10 );
 241                 break;
 242         case BANDWIDTH_8_MHZ:
 243                 cx22702_writereg(state, 0x0C, cx22702_readreg(state, 0x0C) &0xcf );
 244                 break;
 245         default:
 246                 dprintk ("%s: invalid bandwidth\n",__FUNCTION__);
 247                 return -EINVAL;
 248         }
 249
 250
 251         p->u.ofdm.code_rate_LP = FEC_AUTO; //temp hack as manual not working
 252
 253         /* use auto configuration? */
 254         if((p->u.ofdm.hierarchy_information==HIERARCHY_AUTO) ||
 255            (p->u.ofdm.constellation==QAM_AUTO) ||
 256            (p->u.ofdm.code_rate_HP==FEC_AUTO) ||
 257            (p->u.ofdm.code_rate_LP==FEC_AUTO) ||
 258            (p->u.ofdm.guard_interval==GUARD_INTERVAL_AUTO) ||
 259            (p->u.ofdm.transmission_mode==TRANSMISSION_MODE_AUTO) ) {
 260
 261                 /* TPS Source - use hardware driven values */
 262                 cx22702_writereg(state, 0x06, 0x10);
 263                 cx22702_writereg(state, 0x07, 0x9);
 264                 cx22702_writereg(state, 0x08, 0xC1);
 265                 cx22702_writereg(state, 0x0B, cx22702_readreg(state, 0x0B) & 0xfc );
 266                 cx22702_writereg(state, 0x0C, (cx22702_readreg(state, 0x0C) & 0xBF) | 0x40 );
 267                 cx22702_writereg(state, 0x00, 0x01); /* Begin aquisition */
 268                 dprintk("%s: Autodetecting\n",__FUNCTION__);
 269                 return 0;
 270         }
 271
 272         /* manually programmed values */
 273         val=0;
 274         switch(p->u.ofdm.constellation) {
 275                 case   QPSK: val = (val&0xe7); break;
 276                 case QAM_16: val = (val&0xe7)|0x08; break;
 277                 case QAM_64: val = (val&0xe7)|0x10; break;
 278                 default:
 279                         dprintk ("%s: invalid constellation\n",__FUNCTION__);
 280                         return -EINVAL;
 281         }
 282         switch(p->u.ofdm.hierarchy_information) {
 283                 case HIERARCHY_NONE: val = (val&0xf8); break;
 284                 case    HIERARCHY_1: val = (val&0xf8)|1; break;
 285                 case    HIERARCHY_2: val = (val&0xf8)|2; break;
 286                 case    HIERARCHY_4: val = (val&0xf8)|3; break;
 287                 default:
 288                         dprintk ("%s: invalid hierarchy\n",__FUNCTION__);
 289                         return -EINVAL;
 290         }
 291         cx22702_writereg (state, 0x06, val);
 292
 293         val=0;
 294         switch(p->u.ofdm.code_rate_HP) {
 295                 case FEC_NONE:
 296                 case FEC_1_2: val = (val&0xc7); break;
 297                 case FEC_2_3: val = (val&0xc7)|0x08; break;
 298                 case FEC_3_4: val = (val&0xc7)|0x10; break;
 299                 case FEC_5_6: val = (val&0xc7)|0x18; break;
 300                 case FEC_7_8: val = (val&0xc7)|0x20; break;
 301                 default:
 302                         dprintk ("%s: invalid code_rate_HP\n",__FUNCTION__);
 303                         return -EINVAL;
 304         }
 305         switch(p->u.ofdm.code_rate_LP) {
 306                 case FEC_NONE:
 307                 case FEC_1_2: val = (val&0xf8); break;
 308                 case FEC_2_3: val = (val&0xf8)|1; break;
 309                 case FEC_3_4: val = (val&0xf8)|2; break;
 310                 case FEC_5_6: val = (val&0xf8)|3; break;
 311                 case FEC_7_8: val = (val&0xf8)|4; break;
 312                 default:
 313                         dprintk ("%s: invalid code_rate_LP\n",__FUNCTION__);
 314                         return -EINVAL;
 315         }
 316         cx22702_writereg (state, 0x07, val);
 317
 318         val=0;
 319         switch(p->u.ofdm.guard_interval) {
 320                 case GUARD_INTERVAL_1_32: val = (val&0xf3); break;
 321                 case GUARD_INTERVAL_1_16: val = (val&0xf3)|0x04; break;
 322                 case  GUARD_INTERVAL_1_8: val = (val&0xf3)|0x08; break;
 323                 case  GUARD_INTERVAL_1_4: val = (val&0xf3)|0x0c; break;
 324                 default:
 325                         dprintk ("%s: invalid guard_interval\n",__FUNCTION__);
 326                         return -EINVAL;
 327         }
 328         switch(p->u.ofdm.transmission_mode) {
 329                 case TRANSMISSION_MODE_2K: val = (val&0xfc); break;
 330                 case TRANSMISSION_MODE_8K: val = (val&0xfc)|1; break;
 331                 default:
 332                         dprintk ("%s: invalid transmission_mode\n",__FUNCTION__);
 333                         return -EINVAL;
 334         }
 335         cx22702_writereg(state, 0x08, val);
 336         cx22702_writereg(state, 0x0B, (cx22702_readreg(state, 0x0B) & 0xfc) | 0x02 );
 337         cx22702_writereg(state, 0x0C, (cx22702_readreg(state, 0x0C) & 0xBF) | 0x40 );
 338
 339         /* Begin channel aquisition */
 340         cx22702_writereg(state, 0x00, 0x01);
 341
 342         return 0;
 343 }
 344
 345 /* Reset the demod hardware and reset all of the configuration registers
 346    to a default state. */
 347 static int cx22702_init (struct dvb_frontend* fe)
 348 {
 349         int i;
 350         struct cx22702_state* state = fe->demodulator_priv;
 351
 352         cx22702_writereg (state, 0x00, 0x02);
 353
 354         msleep(10);
 355
 356         for (i=0; i<sizeof(init_tab); i+=2)
 357                 cx22702_writereg (state, init_tab[i], init_tab[i+1]);
 358
 359         cx22702_writereg (state, 0xf8, (state->config->output_mode << 1) & 0x02);
 360
 361         /* init PLL */
 362         if (state->config->pll_init)
 363                 state->config->pll_init(fe);
 364
 365         cx22702_i2c_gate_ctrl(fe, 0);
 366
 367         return 0;
 368 }
 369
 370 static int cx22702_read_status(struct dvb_frontend* fe, fe_status_t* status)
 371 {
 372         struct cx22702_state* state = fe->demodulator_priv;
 373         u8 reg0A;
 374         u8 reg23;
 375
 376         *status = 0;
 377
 378         reg0A = cx22702_readreg (state, 0x0A);
 379         reg23 = cx22702_readreg (state, 0x23);
 380
 381         dprintk ("%s: status demod=0x%02x agc=0x%02x\n"
 382                 ,__FUNCTION__,reg0A,reg23);
 383
 384         if(reg0A & 0x10) {
 385                 *status |= FE_HAS_LOCK;
 386                 *status |= FE_HAS_VITERBI;
 387                 *status |= FE_HAS_SYNC;
 388         }
 389
 390         if(reg0A & 0x20)
 391                 *status |= FE_HAS_CARRIER;
 392
 393         if(reg23 < 0xf0)
 394                 *status |= FE_HAS_SIGNAL;
 395
 396         return 0;
 397 }
 398
 399 static int cx22702_read_ber(struct dvb_frontend* fe, u32* ber)
 400 {
 401         struct cx22702_state* state = fe->demodulator_priv;
 402
 403         if(cx22702_readreg (state, 0xE4) & 0x02) {
 404                 /* Realtime statistics */
 405                 *ber = (cx22702_readreg (state, 0xDE) & 0x7F) << 7
 406                         | (cx22702_readreg (state, 0xDF)&0x7F);
 407         } else {
 408                 /* Averagtine statistics */
 409                 *ber = (cx22702_readreg (state, 0xDE) & 0x7F) << 7
 410                         | cx22702_readreg (state, 0xDF);
 411         }
 412
 413         return 0;
 414 }
 415
 416 static int cx22702_read_signal_strength(struct dvb_frontend* fe, u16* signal_strength)
 417 {
 418         struct cx22702_state* state = fe->demodulator_priv;
 419
 420         *signal_strength = cx22702_readreg (state, 0x23);
 421
 422         return 0;
 423 }
 424
 425 static int cx22702_read_snr(struct dvb_frontend* fe, u16* snr)
 426 {
 427         struct cx22702_state* state = fe->demodulator_priv;
 428
 429         u16 rs_ber=0;
 430         if(cx22702_readreg (state, 0xE4) & 0x02) {
 431                 /* Realtime statistics */
 432                 rs_ber = (cx22702_readreg (state, 0xDE) & 0x7F) << 7
 433                         | (cx22702_readreg (state, 0xDF)& 0x7F);
 434         } else {
 435                 /* Averagine statistics */
 436                 rs_ber = (cx22702_readreg (state, 0xDE) & 0x7F) << 8
 437                         | cx22702_readreg (state, 0xDF);
 438         }
 439         *snr = ~rs_ber;
 440
 441         return 0;
 442 }
 443
 444 static int cx22702_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
 445 {
 446         struct cx22702_state* state = fe->demodulator_priv;
 447
 448         u8 _ucblocks;
 449
 450         /* RS Uncorrectable Packet Count then reset */
 451         _ucblocks = cx22702_readreg (state, 0xE3);
 452         if (state->prevUCBlocks < _ucblocks)
 453                 *ucblocks = (_ucblocks - state->prevUCBlocks);
 454         else
 455                 *ucblocks = state->prevUCBlocks - _ucblocks;
 456         state->prevUCBlocks = _ucblocks;
 457
 458         return 0;
 459 }
 460
 461 static int cx22702_get_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
 462 {
 463         struct cx22702_state* state = fe->demodulator_priv;
 464
 465         u8 reg0C = cx22702_readreg (state, 0x0C);
 466
 467         p->inversion = reg0C & 0x1 ? INVERSION_ON : INVERSION_OFF;
 468         return cx22702_get_tps (state, &p->u.ofdm);
 469 }
 470
 471 static int cx22702_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune)
 472 {
 473         tune->min_delay_ms = 1000;
 474         return 0;
 475 }
 476
 477 static void cx22702_release(struct dvb_frontend* fe)
 478 {
 479         struct cx22702_state* state = fe->demodulator_priv;
 480         kfree(state);
 481 }
 482
 483 static struct dvb_frontend_ops cx22702_ops;
 484
 485 struct dvb_frontend* cx22702_attach(const struct cx22702_config* config,
 486                                     struct i2c_adapter* i2c)
 487 {
 488         struct cx22702_state* state = NULL;
 489
 490         /* allocate memory for the internal state */
 491         state = kmalloc(sizeof(struct cx22702_state), GFP_KERNEL);
 492         if (state == NULL)
 493                 goto error;
 494
 495         /* setup the state */
 496         state->config = config;
 497         state->i2c = i2c;
 498         memcpy(&state->ops, &cx22702_ops, sizeof(struct dvb_frontend_ops));
 499         state->prevUCBlocks = 0;
 500
 501         /* check if the demod is there */
 502         if (cx22702_readreg(state, 0x1f) != 0x3)
 503                 goto error;
 504
 505         /* create dvb_frontend */
 506         state->frontend.ops = &state->ops;
 507         state->frontend.demodulator_priv = state;
 508         return &state->frontend;
 509
 510 error:
 511         kfree(state);
 512         return NULL;
 513 }
 514
 515 static struct dvb_frontend_ops cx22702_ops = {
 516
 517         .info = {
 518                 .name                   = "Conexant CX22702 DVB-T",
 519                 .type                   = FE_OFDM,
 520                 .frequency_min          = 177000000,
 521                 .frequency_max          = 858000000,
 522                 .frequency_stepsize     = 166666,
 523                 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 524                 FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
 525                 FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
 526                 FE_CAN_HIERARCHY_AUTO | FE_CAN_GUARD_INTERVAL_AUTO |
 527                 FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_RECOVER
 528         },
 529
 530         .release = cx22702_release,
 531
 532         .init = cx22702_init,
 533
 534         .set_frontend = cx22702_set_tps,
 535         .get_frontend = cx22702_get_frontend,
 536         .get_tune_settings = cx22702_get_tune_settings,
 537
 538         .read_status = cx22702_read_status,
 539         .read_ber = cx22702_read_ber,
 540         .read_signal_strength = cx22702_read_signal_strength,
 541         .read_snr = cx22702_read_snr,
 542         .read_ucblocks = cx22702_read_ucblocks,
 543         .i2c_gate_ctrl = cx22702_i2c_gate_ctrl,
 544 };
 545
 546 module_param(debug, int, 0644);
 547 MODULE_PARM_DESC(debug, "Enable verbose debug messages");
 548
 549 MODULE_DESCRIPTION("Conexant CX22702 DVB-T Demodulator driver");
 550 MODULE_AUTHOR("Steven Toth");
 551 MODULE_LICENSE("GPL");
 552
 553 EXPORT_SYMBOL(cx22702_attach);