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