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