kernel/drivers/media/dvb-frontends/ves1x93.c

   1 /*
   2     Driver for VES1893 and VES1993 QPSK Demodulators
   3
   4     Copyright (C) 1999 Convergence Integrated Media GmbH <ralph@convergence.de>
   5     Copyright (C) 2001 Ronny Strutz <3des@elitedvb.de>
   6     Copyright (C) 2002 Dennis Noermann <dennis.noermann@noernet.de>
   7     Copyright (C) 2002-2003 Andreas Oberritter <obi@linuxtv.org>
   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
  18     GNU General Public License for more details.
  19
  20     You should have received a copy of the GNU General Public License
  21     along with this program; if not, write to the Free Software
  22     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23
  24 */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28 #include <linux/init.h>
  29 #include <linux/string.h>
  30 #include <linux/slab.h>
  31 #include <linux/delay.h>
  32
  33 #include "dvb_frontend.h"
  34 #include "ves1x93.h"
  35
  36
  37 struct ves1x93_state {
  38         struct i2c_adapter* i2c;
  39         /* configuration settings */
  40         const struct ves1x93_config* config;
  41         struct dvb_frontend frontend;
  42
  43         /* previous uncorrected block counter */
  44         fe_spectral_inversion_t inversion;
  45         u8 *init_1x93_tab;
  46         u8 *init_1x93_wtab;
  47         u8 tab_size;
  48         u8 demod_type;
  49         u32 frequency;
  50 };
  51
  52 static int debug;
  53 #define dprintk if (debug) printk
  54
  55 #define DEMOD_VES1893           0
  56 #define DEMOD_VES1993           1
  57
  58 static u8 init_1893_tab [] = {
  59         0x01, 0xa4, 0x35, 0x80, 0x2a, 0x0b, 0x55, 0xc4,
  60         0x09, 0x69, 0x00, 0x86, 0x4c, 0x28, 0x7f, 0x00,
  61         0x00, 0x81, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  62         0x80, 0x00, 0x21, 0xb0, 0x14, 0x00, 0xdc, 0x00,
  63         0x81, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  64         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  65         0x00, 0x55, 0x00, 0x00, 0x7f, 0x00
  66 };
  67
  68 static u8 init_1993_tab [] = {
  69         0x00, 0x9c, 0x35, 0x80, 0x6a, 0x09, 0x72, 0x8c,
  70         0x09, 0x6b, 0x00, 0x00, 0x4c, 0x08, 0x00, 0x00,
  71         0x00, 0x81, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  72         0x80, 0x40, 0x21, 0xb0, 0x00, 0x00, 0x00, 0x10,
  73         0x81, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  74         0x00, 0x00, 0x80, 0x80, 0x00, 0x00, 0x00, 0x00,
  75         0x00, 0x55, 0x03, 0x00, 0x00, 0x00, 0x00, 0x03,
  76         0x00, 0x00, 0x0e, 0x80, 0x00
  77 };
  78
  79 static u8 init_1893_wtab[] =
  80 {
  81         1,1,1,1,1,1,1,1, 1,1,0,0,1,1,0,0,
  82         0,1,0,0,0,0,0,0, 1,0,1,1,0,0,0,1,
  83         1,1,1,0,0,0,0,0, 0,0,1,1,0,0,0,0,
  84         1,1,1,0,1,1
  85 };
  86
  87 static u8 init_1993_wtab[] =
  88 {
  89         1,1,1,1,1,1,1,1, 1,1,0,0,1,1,0,0,
  90         0,1,0,0,0,0,0,0, 1,1,1,1,0,0,0,1,
  91         1,1,1,0,0,0,0,0, 0,0,1,1,0,0,0,0,
  92         1,1,1,0,1,1,1,1, 1,1,1,1,1
  93 };
  94
  95 static int ves1x93_writereg (struct ves1x93_state* state, u8 reg, u8 data)
  96 {
  97         u8 buf [] = { 0x00, reg, data };
  98         struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 3 };
  99         int err;
 100
 101         if ((err = i2c_transfer (state->i2c, &msg, 1)) != 1) {
 102                 dprintk ("%s: writereg error (err == %i, reg == 0x%02x, data == 0x%02x)\n", __func__, err, reg, data);
 103                 return -EREMOTEIO;
 104         }
 105
 106         return 0;
 107 }
 108
 109 static u8 ves1x93_readreg (struct ves1x93_state* state, u8 reg)
 110 {
 111         int ret;
 112         u8 b0 [] = { 0x00, reg };
 113         u8 b1 [] = { 0 };
 114         struct i2c_msg msg [] = { { .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 2 },
 115                            { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 1 } };
 116
 117         ret = i2c_transfer (state->i2c, msg, 2);
 118
 119         if (ret != 2) return ret;
 120
 121         return b1[0];
 122 }
 123
 124 static int ves1x93_clr_bit (struct ves1x93_state* state)
 125 {
 126         msleep(10);
 127         ves1x93_writereg (state, 0, state->init_1x93_tab[0] & 0xfe);
 128         ves1x93_writereg (state, 0, state->init_1x93_tab[0]);
 129         msleep(50);
 130         return 0;
 131 }
 132
 133 static int ves1x93_set_inversion (struct ves1x93_state* state, fe_spectral_inversion_t inversion)
 134 {
 135         u8 val;
 136
 137         /*
 138          * inversion on/off are interchanged because i and q seem to
 139          * be swapped on the hardware
 140          */
 141
 142         switch (inversion) {
 143         case INVERSION_OFF:
 144                 val = 0xc0;
 145                 break;
 146         case INVERSION_ON:
 147                 val = 0x80;
 148                 break;
 149         case INVERSION_AUTO:
 150                 val = 0x00;
 151                 break;
 152         default:
 153                 return -EINVAL;
 154         }
 155
 156         return ves1x93_writereg (state, 0x0c, (state->init_1x93_tab[0x0c] & 0x3f) | val);
 157 }
 158
 159 static int ves1x93_set_fec (struct ves1x93_state* state, fe_code_rate_t fec)
 160 {
 161         if (fec == FEC_AUTO)
 162                 return ves1x93_writereg (state, 0x0d, 0x08);
 163         else if (fec < FEC_1_2 || fec > FEC_8_9)
 164                 return -EINVAL;
 165         else
 166                 return ves1x93_writereg (state, 0x0d, fec - FEC_1_2);
 167 }
 168
 169 static fe_code_rate_t ves1x93_get_fec (struct ves1x93_state* state)
 170 {
 171         return FEC_1_2 + ((ves1x93_readreg (state, 0x0d) >> 4) & 0x7);
 172 }
 173
 174 static int ves1x93_set_symbolrate (struct ves1x93_state* state, u32 srate)
 175 {
 176         u32 BDR;
 177         u32 ratio;
 178         u8  ADCONF, FCONF, FNR, AGCR;
 179         u32 BDRI;
 180         u32 tmp;
 181         u32 FIN;
 182
 183         dprintk("%s: srate == %d\n", __func__, (unsigned int) srate);
 184
 185         if (srate > state->config->xin/2)
 186                 srate = state->config->xin/2;
 187
 188         if (srate < 500000)
 189                 srate = 500000;
 190
 191 #define MUL (1UL<<26)
 192
 193         FIN = (state->config->xin + 6000) >> 4;
 194
 195         tmp = srate << 6;
 196         ratio = tmp / FIN;
 197
 198         tmp = (tmp % FIN) << 8;
 199         ratio = (ratio << 8) + tmp / FIN;
 200
 201         tmp = (tmp % FIN) << 8;
 202         ratio = (ratio << 8) + tmp / FIN;
 203
 204         FNR = 0xff;
 205
 206         if (ratio < MUL/3)           FNR = 0;
 207         if (ratio < (MUL*11)/50)     FNR = 1;
 208         if (ratio < MUL/6)           FNR = 2;
 209         if (ratio < MUL/9)           FNR = 3;
 210         if (ratio < MUL/12)          FNR = 4;
 211         if (ratio < (MUL*11)/200)    FNR = 5;
 212         if (ratio < MUL/24)          FNR = 6;
 213         if (ratio < (MUL*27)/1000)   FNR = 7;
 214         if (ratio < MUL/48)          FNR = 8;
 215         if (ratio < (MUL*137)/10000) FNR = 9;
 216
 217         if (FNR == 0xff) {
 218                 ADCONF = 0x89;
 219                 FCONF  = 0x80;
 220                 FNR     = 0;
 221         } else {
 222                 ADCONF = 0x81;
 223                 FCONF  = 0x88 | (FNR >> 1) | ((FNR & 0x01) << 5);
 224                 /*FCONF  = 0x80 | ((FNR & 0x01) << 5) | (((FNR > 1) & 0x03) << 3) | ((FNR >> 1) & 0x07);*/
 225         }
 226
 227         BDR = (( (ratio << (FNR >> 1)) >> 4) + 1) >> 1;
 228         BDRI = ( ((FIN << 8) / ((srate << (FNR >> 1)) >> 2)) + 1) >> 1;
 229
 230         dprintk("FNR= %d\n", FNR);
 231         dprintk("ratio= %08x\n", (unsigned int) ratio);
 232         dprintk("BDR= %08x\n", (unsigned int) BDR);
 233         dprintk("BDRI= %02x\n", (unsigned int) BDRI);
 234
 235         if (BDRI > 0xff)
 236                 BDRI = 0xff;
 237
 238         ves1x93_writereg (state, 0x06, 0xff & BDR);
 239         ves1x93_writereg (state, 0x07, 0xff & (BDR >> 8));
 240         ves1x93_writereg (state, 0x08, 0x0f & (BDR >> 16));
 241
 242         ves1x93_writereg (state, 0x09, BDRI);
 243         ves1x93_writereg (state, 0x20, ADCONF);
 244         ves1x93_writereg (state, 0x21, FCONF);
 245
 246         AGCR = state->init_1x93_tab[0x05];
 247         if (state->config->invert_pwm)
 248                 AGCR |= 0x20;
 249
 250         if (srate < 6000000)
 251                 AGCR |= 0x80;
 252         else
 253                 AGCR &= ~0x80;
 254
 255         ves1x93_writereg (state, 0x05, AGCR);
 256
 257         /* ves1993 hates this, will lose lock */
 258         if (state->demod_type != DEMOD_VES1993)
 259                 ves1x93_clr_bit (state);
 260
 261         return 0;
 262 }
 263
 264 static int ves1x93_init (struct dvb_frontend* fe)
 265 {
 266         struct ves1x93_state* state = fe->demodulator_priv;
 267         int i;
 268         int val;
 269
 270         dprintk("%s: init chip\n", __func__);
 271
 272         for (i = 0; i < state->tab_size; i++) {
 273                 if (state->init_1x93_wtab[i]) {
 274                         val = state->init_1x93_tab[i];
 275
 276                         if (state->config->invert_pwm && (i == 0x05)) val |= 0x20; /* invert PWM */
 277                         ves1x93_writereg (state, i, val);
 278                 }
 279         }
 280
 281         return 0;
 282 }
 283
 284 static int ves1x93_set_voltage (struct dvb_frontend* fe, fe_sec_voltage_t voltage)
 285 {
 286         struct ves1x93_state* state = fe->demodulator_priv;
 287
 288         switch (voltage) {
 289         case SEC_VOLTAGE_13:
 290                 return ves1x93_writereg (state, 0x1f, 0x20);
 291         case SEC_VOLTAGE_18:
 292                 return ves1x93_writereg (state, 0x1f, 0x30);
 293         case SEC_VOLTAGE_OFF:
 294                 return ves1x93_writereg (state, 0x1f, 0x00);
 295         default:
 296                 return -EINVAL;
 297         }
 298 }
 299
 300 static int ves1x93_read_status(struct dvb_frontend* fe, fe_status_t* status)
 301 {
 302         struct ves1x93_state* state = fe->demodulator_priv;
 303
 304         u8 sync = ves1x93_readreg (state, 0x0e);
 305
 306         /*
 307          * The ves1893 sometimes returns sync values that make no sense,
 308          * because, e.g., the SIGNAL bit is 0, while some of the higher
 309          * bits are 1 (and how can there be a CARRIER w/o a SIGNAL?).
 310          * Tests showed that the VITERBI and SYNC bits are returned
 311          * reliably, while the SIGNAL and CARRIER bits ar sometimes wrong.
 312          * If such a case occurs, we read the value again, until we get a
 313          * valid value.
 314          */
 315         int maxtry = 10; /* just for safety - let's not get stuck here */
 316         while ((sync & 0x03) != 0x03 && (sync & 0x0c) && maxtry--) {
 317                 msleep(10);
 318                 sync = ves1x93_readreg (state, 0x0e);
 319         }
 320
 321         *status = 0;
 322
 323         if (sync & 1)
 324                 *status |= FE_HAS_SIGNAL;
 325
 326         if (sync & 2)
 327                 *status |= FE_HAS_CARRIER;
 328
 329         if (sync & 4)
 330                 *status |= FE_HAS_VITERBI;
 331
 332         if (sync & 8)
 333                 *status |= FE_HAS_SYNC;
 334
 335         if ((sync & 0x1f) == 0x1f)
 336                 *status |= FE_HAS_LOCK;
 337
 338         return 0;
 339 }
 340
 341 static int ves1x93_read_ber(struct dvb_frontend* fe, u32* ber)
 342 {
 343         struct ves1x93_state* state = fe->demodulator_priv;
 344
 345         *ber = ves1x93_readreg (state, 0x15);
 346         *ber |= (ves1x93_readreg (state, 0x16) << 8);
 347         *ber |= ((ves1x93_readreg (state, 0x17) & 0x0F) << 16);
 348         *ber *= 10;
 349
 350         return 0;
 351 }
 352
 353 static int ves1x93_read_signal_strength(struct dvb_frontend* fe, u16* strength)
 354 {
 355         struct ves1x93_state* state = fe->demodulator_priv;
 356
 357         u8 signal = ~ves1x93_readreg (state, 0x0b);
 358         *strength = (signal << 8) | signal;
 359
 360         return 0;
 361 }
 362
 363 static int ves1x93_read_snr(struct dvb_frontend* fe, u16* snr)
 364 {
 365         struct ves1x93_state* state = fe->demodulator_priv;
 366
 367         u8 _snr = ~ves1x93_readreg (state, 0x1c);
 368         *snr = (_snr << 8) | _snr;
 369
 370         return 0;
 371 }
 372
 373 static int ves1x93_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
 374 {
 375         struct ves1x93_state* state = fe->demodulator_priv;
 376
 377         *ucblocks = ves1x93_readreg (state, 0x18) & 0x7f;
 378
 379         if (*ucblocks == 0x7f)
 380                 *ucblocks = 0xffffffff;   /* counter overflow... */
 381
 382         ves1x93_writereg (state, 0x18, 0x00);  /* reset the counter */
 383         ves1x93_writereg (state, 0x18, 0x80);  /* dto. */
 384
 385         return 0;
 386 }
 387
 388 static int ves1x93_set_frontend(struct dvb_frontend *fe)
 389 {
 390         struct dtv_frontend_properties *p = &fe->dtv_property_cache;
 391         struct ves1x93_state* state = fe->demodulator_priv;
 392
 393         if (fe->ops.tuner_ops.set_params) {
 394                 fe->ops.tuner_ops.set_params(fe);
 395                 if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
 396         }
 397         ves1x93_set_inversion (state, p->inversion);
 398         ves1x93_set_fec(state, p->fec_inner);
 399         ves1x93_set_symbolrate(state, p->symbol_rate);
 400         state->inversion = p->inversion;
 401         state->frequency = p->frequency;
 402
 403         return 0;
 404 }
 405
 406 static int ves1x93_get_frontend(struct dvb_frontend *fe)
 407 {
 408         struct dtv_frontend_properties *p = &fe->dtv_property_cache;
 409         struct ves1x93_state* state = fe->demodulator_priv;
 410         int afc;
 411
 412         afc = ((int)((char)(ves1x93_readreg (state, 0x0a) << 1)))/2;
 413         afc = (afc * (int)(p->symbol_rate/1000/8))/16;
 414
 415         p->frequency = state->frequency - afc;
 416
 417         /*
 418          * inversion indicator is only valid
 419          * if auto inversion was used
 420          */
 421         if (state->inversion == INVERSION_AUTO)
 422                 p->inversion = (ves1x93_readreg (state, 0x0f) & 2) ?
 423                                 INVERSION_OFF : INVERSION_ON;
 424         p->fec_inner = ves1x93_get_fec(state);
 425         /*  XXX FIXME: timing offset !! */
 426
 427         return 0;
 428 }
 429
 430 static int ves1x93_sleep(struct dvb_frontend* fe)
 431 {
 432         struct ves1x93_state* state = fe->demodulator_priv;
 433
 434         return ves1x93_writereg (state, 0x00, 0x08);
 435 }
 436
 437 static void ves1x93_release(struct dvb_frontend* fe)
 438 {
 439         struct ves1x93_state* state = fe->demodulator_priv;
 440         kfree(state);
 441 }
 442
 443 static int ves1x93_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
 444 {
 445         struct ves1x93_state* state = fe->demodulator_priv;
 446
 447         if (enable) {
 448                 return ves1x93_writereg(state, 0x00, 0x11);
 449         } else {
 450                 return ves1x93_writereg(state, 0x00, 0x01);
 451         }
 452 }
 453
 454 static struct dvb_frontend_ops ves1x93_ops;
 455
 456 struct dvb_frontend* ves1x93_attach(const struct ves1x93_config* config,
 457                                     struct i2c_adapter* i2c)
 458 {
 459         struct ves1x93_state* state = NULL;
 460         u8 identity;
 461
 462         /* allocate memory for the internal state */
 463         state = kzalloc(sizeof(struct ves1x93_state), GFP_KERNEL);
 464         if (state == NULL) goto error;
 465
 466         /* setup the state */
 467         state->config = config;
 468         state->i2c = i2c;
 469         state->inversion = INVERSION_OFF;
 470
 471         /* check if the demod is there + identify it */
 472         identity = ves1x93_readreg(state, 0x1e);
 473         switch (identity) {
 474         case 0xdc: /* VES1893A rev1 */
 475                 printk("ves1x93: Detected ves1893a rev1\n");
 476                 state->demod_type = DEMOD_VES1893;
 477                 state->init_1x93_tab = init_1893_tab;
 478                 state->init_1x93_wtab = init_1893_wtab;
 479                 state->tab_size = sizeof(init_1893_tab);
 480                 break;
 481
 482         case 0xdd: /* VES1893A rev2 */
 483                 printk("ves1x93: Detected ves1893a rev2\n");
 484                 state->demod_type = DEMOD_VES1893;
 485                 state->init_1x93_tab = init_1893_tab;
 486                 state->init_1x93_wtab = init_1893_wtab;
 487                 state->tab_size = sizeof(init_1893_tab);
 488                 break;
 489
 490         case 0xde: /* VES1993 */
 491                 printk("ves1x93: Detected ves1993\n");
 492                 state->demod_type = DEMOD_VES1993;
 493                 state->init_1x93_tab = init_1993_tab;
 494                 state->init_1x93_wtab = init_1993_wtab;
 495                 state->tab_size = sizeof(init_1993_tab);
 496                 break;
 497
 498         default:
 499                 goto error;
 500         }
 501
 502         /* create dvb_frontend */
 503         memcpy(&state->frontend.ops, &ves1x93_ops, sizeof(struct dvb_frontend_ops));
 504         state->frontend.demodulator_priv = state;
 505         return &state->frontend;
 506
 507 error:
 508         kfree(state);
 509         return NULL;
 510 }
 511
 512 static struct dvb_frontend_ops ves1x93_ops = {
 513         .delsys = { SYS_DVBS },
 514         .info = {
 515                 .name                   = "VLSI VES1x93 DVB-S",
 516                 .frequency_min          = 950000,
 517                 .frequency_max          = 2150000,
 518                 .frequency_stepsize     = 125,           /* kHz for QPSK frontends */
 519                 .frequency_tolerance    = 29500,
 520                 .symbol_rate_min        = 1000000,
 521                 .symbol_rate_max        = 45000000,
 522         /*      .symbol_rate_tolerance  =       ???,*/
 523                 .caps = FE_CAN_INVERSION_AUTO |
 524                         FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 525                         FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
 526                         FE_CAN_QPSK
 527         },
 528
 529         .release = ves1x93_release,
 530
 531         .init = ves1x93_init,
 532         .sleep = ves1x93_sleep,
 533         .i2c_gate_ctrl = ves1x93_i2c_gate_ctrl,
 534
 535         .set_frontend = ves1x93_set_frontend,
 536         .get_frontend = ves1x93_get_frontend,
 537
 538         .read_status = ves1x93_read_status,
 539         .read_ber = ves1x93_read_ber,
 540         .read_signal_strength = ves1x93_read_signal_strength,
 541         .read_snr = ves1x93_read_snr,
 542         .read_ucblocks = ves1x93_read_ucblocks,
 543
 544         .set_voltage = ves1x93_set_voltage,
 545 };
 546
 547 module_param(debug, int, 0644);
 548
 549 MODULE_DESCRIPTION("VLSI VES1x93 DVB-S Demodulator driver");
 550 MODULE_AUTHOR("Ralph Metzler");
 551 MODULE_LICENSE("GPL");
 552
 553 EXPORT_SYMBOL(ves1x93_attach);