drivers/media/dvb/frontends/s5h1420.c

   1 /*
   2 Driver for Samsung S5H1420 QPSK Demodulator
   3
   4 Copyright (C) 2005 Andrew de Quincey <adq_dvb@lidskialf.net>
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2 of the License, or
   9 (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program; if not, write to the Free Software
  19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20
  21 */
  22
  23 #include <linux/kernel.h>
  24 #include <linux/module.h>
  25 #include <linux/init.h>
  26 #include <linux/string.h>
  27 #include <linux/slab.h>
  28 #include <linux/delay.h>
  29
  30 #include "dvb_frontend.h"
  31 #include "s5h1420.h"
  32
  33
  34
  35 #define TONE_FREQ 22000
  36
  37 struct s5h1420_state {
  38         struct i2c_adapter* i2c;
  39         struct dvb_frontend_ops ops;
  40         const struct s5h1420_config* config;
  41         struct dvb_frontend frontend;
  42
  43         u8 postlocked:1;
  44         u32 fclk;
  45         u32 tunedfreq;
  46         fe_code_rate_t fec_inner;
  47         u32 symbol_rate;
  48 };
  49
  50 static u32 s5h1420_getsymbolrate(struct s5h1420_state* state);
  51 static int s5h1420_get_tune_settings(struct dvb_frontend* fe,
  52                                      struct dvb_frontend_tune_settings* fesettings);
  53
  54
  55 static int debug = 0;
  56 #define dprintk if (debug) printk
  57
  58 static int s5h1420_writereg (struct s5h1420_state* state, u8 reg, u8 data)
  59 {
  60         u8 buf [] = { reg, data };
  61         struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 2 };
  62         int err;
  63
  64         if ((err = i2c_transfer (state->i2c, &msg, 1)) != 1) {
  65                 dprintk ("%s: writereg error (err == %i, reg == 0x%02x, data == 0x%02x)\n", __FUNCTION__, err, reg, data);
  66                 return -EREMOTEIO;
  67         }
  68
  69         return 0;
  70 }
  71
  72 static u8 s5h1420_readreg (struct s5h1420_state* state, u8 reg)
  73 {
  74         int ret;
  75         u8 b0 [] = { reg };
  76         u8 b1 [] = { 0 };
  77         struct i2c_msg msg1 = { .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 1 };
  78         struct i2c_msg msg2 = { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 1 };
  79
  80         if ((ret = i2c_transfer (state->i2c, &msg1, 1)) != 1)
  81                 return ret;
  82
  83         if ((ret = i2c_transfer (state->i2c, &msg2, 1)) != 1)
  84                 return ret;
  85
  86         return b1[0];
  87 }
  88
  89 static int s5h1420_set_voltage (struct dvb_frontend* fe, fe_sec_voltage_t voltage)
  90 {
  91         struct s5h1420_state* state = fe->demodulator_priv;
  92
  93         switch(voltage) {
  94         case SEC_VOLTAGE_13:
  95                 s5h1420_writereg(state, 0x3c,
  96                                  (s5h1420_readreg(state, 0x3c) & 0xfe) | 0x02);
  97                 break;
  98
  99         case SEC_VOLTAGE_18:
 100                 s5h1420_writereg(state, 0x3c, s5h1420_readreg(state, 0x3c) | 0x03);
 101                 break;
 102
 103         case SEC_VOLTAGE_OFF:
 104                 s5h1420_writereg(state, 0x3c, s5h1420_readreg(state, 0x3c) & 0xfd);
 105                 break;
 106         }
 107
 108         return 0;
 109 }
 110
 111 static int s5h1420_set_tone (struct dvb_frontend* fe, fe_sec_tone_mode_t tone)
 112 {
 113         struct s5h1420_state* state = fe->demodulator_priv;
 114
 115         switch(tone) {
 116         case SEC_TONE_ON:
 117                 s5h1420_writereg(state, 0x3b,
 118                                  (s5h1420_readreg(state, 0x3b) & 0x74) | 0x08);
 119                 break;
 120
 121         case SEC_TONE_OFF:
 122                 s5h1420_writereg(state, 0x3b,
 123                                  (s5h1420_readreg(state, 0x3b) & 0x74) | 0x01);
 124                 break;
 125         }
 126
 127         return 0;
 128 }
 129
 130 static int s5h1420_send_master_cmd (struct dvb_frontend* fe,
 131                                     struct dvb_diseqc_master_cmd* cmd)
 132 {
 133         struct s5h1420_state* state = fe->demodulator_priv;
 134         u8 val;
 135         int i;
 136         unsigned long timeout;
 137         int result = 0;
 138
 139         if (cmd->msg_len > 8)
 140                 return -EINVAL;
 141
 142         /* setup for DISEQC */
 143         val = s5h1420_readreg(state, 0x3b);
 144         s5h1420_writereg(state, 0x3b, 0x02);
 145         msleep(15);
 146
 147         /* write the DISEQC command bytes */
 148         for(i=0; i< cmd->msg_len; i++) {
 149                 s5h1420_writereg(state, 0x3d + i, cmd->msg[i]);
 150         }
 151
 152         /* kick off transmission */
 153         s5h1420_writereg(state, 0x3b, s5h1420_readreg(state, 0x3b) |
 154                                       ((cmd->msg_len-1) << 4) | 0x08);
 155
 156         /* wait for transmission to complete */
 157         timeout = jiffies + ((100*HZ) / 1000);
 158         while(time_before(jiffies, timeout)) {
 159                 if (!(s5h1420_readreg(state, 0x3b) & 0x08))
 160                         break;
 161
 162                 msleep(5);
 163         }
 164         if (time_after(jiffies, timeout))
 165                 result = -ETIMEDOUT;
 166
 167         /* restore original settings */
 168         s5h1420_writereg(state, 0x3b, val);
 169         msleep(15);
 170         return result;
 171 }
 172
 173 static int s5h1420_recv_slave_reply (struct dvb_frontend* fe,
 174                                      struct dvb_diseqc_slave_reply* reply)
 175 {
 176         struct s5h1420_state* state = fe->demodulator_priv;
 177         u8 val;
 178         int i;
 179         int length;
 180         unsigned long timeout;
 181         int result = 0;
 182
 183         /* setup for DISEQC recieve */
 184         val = s5h1420_readreg(state, 0x3b);
 185         s5h1420_writereg(state, 0x3b, 0x82); /* FIXME: guess - do we need to set DIS_RDY(0x08) in receive mode? */
 186         msleep(15);
 187
 188         /* wait for reception to complete */
 189         timeout = jiffies + ((reply->timeout*HZ) / 1000);
 190         while(time_before(jiffies, timeout)) {
 191                 if (!(s5h1420_readreg(state, 0x3b) & 0x80)) /* FIXME: do we test DIS_RDY(0x08) or RCV_EN(0x80)? */
 192                         break;
 193
 194                 msleep(5);
 195         }
 196         if (time_after(jiffies, timeout)) {
 197                 result = -ETIMEDOUT;
 198                 goto exit;
 199         }
 200
 201         /* check error flag - FIXME: not sure what this does - docs do not describe
 202          * beyond "error flag for diseqc receive data :( */
 203         if (s5h1420_readreg(state, 0x49)) {
 204                 result = -EIO;
 205                 goto exit;
 206         }
 207
 208         /* check length */
 209         length = (s5h1420_readreg(state, 0x3b) & 0x70) >> 4;
 210         if (length > sizeof(reply->msg)) {
 211                 result = -EOVERFLOW;
 212                 goto exit;
 213         }
 214         reply->msg_len = length;
 215
 216         /* extract data */
 217         for(i=0; i< length; i++) {
 218                 reply->msg[i] = s5h1420_readreg(state, 0x3d + i);
 219         }
 220
 221 exit:
 222         /* restore original settings */
 223         s5h1420_writereg(state, 0x3b, val);
 224         msleep(15);
 225         return result;
 226 }
 227
 228 static int s5h1420_send_burst (struct dvb_frontend* fe, fe_sec_mini_cmd_t minicmd)
 229 {
 230         struct s5h1420_state* state = fe->demodulator_priv;
 231         u8 val;
 232         int result = 0;
 233         unsigned long timeout;
 234
 235         /* setup for tone burst */
 236         val = s5h1420_readreg(state, 0x3b);
 237         s5h1420_writereg(state, 0x3b, (s5h1420_readreg(state, 0x3b) & 0x70) | 0x01);
 238
 239         /* set value for B position if requested */
 240         if (minicmd == SEC_MINI_B) {
 241                 s5h1420_writereg(state, 0x3b, s5h1420_readreg(state, 0x3b) | 0x04);
 242         }
 243         msleep(15);
 244
 245         /* start transmission */
 246         s5h1420_writereg(state, 0x3b, s5h1420_readreg(state, 0x3b) | 0x08);
 247
 248         /* wait for transmission to complete */
 249         timeout = jiffies + ((100*HZ) / 1000);
 250         while(time_before(jiffies, timeout)) {
 251                 if (!(s5h1420_readreg(state, 0x3b) & 0x08))
 252                         break;
 253
 254                 msleep(5);
 255         }
 256         if (time_after(jiffies, timeout))
 257                 result = -ETIMEDOUT;
 258
 259         /* restore original settings */
 260         s5h1420_writereg(state, 0x3b, val);
 261         msleep(15);
 262         return result;
 263 }
 264
 265 static fe_status_t s5h1420_get_status_bits(struct s5h1420_state* state)
 266 {
 267         u8 val;
 268         fe_status_t status = 0;
 269
 270         val = s5h1420_readreg(state, 0x14);
 271         if (val & 0x02)
 272                 status |=  FE_HAS_SIGNAL;
 273         if (val & 0x01)
 274                 status |=  FE_HAS_CARRIER;
 275         val = s5h1420_readreg(state, 0x36);
 276         if (val & 0x01)
 277                 status |=  FE_HAS_VITERBI;
 278         if (val & 0x20)
 279                 status |=  FE_HAS_SYNC;
 280         if (status == (FE_HAS_SIGNAL|FE_HAS_CARRIER|FE_HAS_VITERBI|FE_HAS_SYNC))
 281                 status |=  FE_HAS_LOCK;
 282
 283         return status;
 284 }
 285
 286 static int s5h1420_read_status(struct dvb_frontend* fe, fe_status_t* status)
 287 {
 288         struct s5h1420_state* state = fe->demodulator_priv;
 289         u8 val;
 290
 291         if (status == NULL)
 292                 return -EINVAL;
 293
 294         /* determine lock state */
 295         *status = s5h1420_get_status_bits(state);
 296
 297         /* fix for FEC 5/6 inversion issue - if it doesn't quite lock, invert
 298         the inversion, wait a bit and check again */
 299         if (*status == (FE_HAS_SIGNAL|FE_HAS_CARRIER|FE_HAS_VITERBI)) {
 300                 val = s5h1420_readreg(state, 0x32);
 301                 if ((val & 0x07) == 0x03) {
 302                         if (val & 0x08)
 303                                 s5h1420_writereg(state, 0x31, 0x13);
 304                         else
 305                                 s5h1420_writereg(state, 0x31, 0x1b);
 306
 307                         /* wait a bit then update lock status */
 308                         mdelay(200);
 309                         *status = s5h1420_get_status_bits(state);
 310                 }
 311         }
 312
 313         /* perform post lock setup */
 314         if ((*status & FE_HAS_LOCK) && (!state->postlocked)) {
 315
 316                 /* calculate the data rate */
 317                 u32 tmp = s5h1420_getsymbolrate(state);
 318                 switch(s5h1420_readreg(state, 0x32) & 0x07) {
 319                 case 0:
 320                         tmp = (tmp * 2 * 1) / 2;
 321                         break;
 322
 323                 case 1:
 324                         tmp = (tmp * 2 * 2) / 3;
 325                         break;
 326
 327                 case 2:
 328                         tmp = (tmp * 2 * 3) / 4;
 329                         break;
 330
 331                 case 3:
 332                         tmp = (tmp * 2 * 5) / 6;
 333                         break;
 334
 335                 case 4:
 336                         tmp = (tmp * 2 * 6) / 7;
 337                         break;
 338
 339                 case 5:
 340                         tmp = (tmp * 2 * 7) / 8;
 341                         break;
 342                 }
 343                 if (tmp == 0) {
 344                         printk("s5h1420: avoided division by 0\n");
 345                         tmp = 1;
 346                 }
 347                 tmp = state->fclk / tmp;
 348
 349                 /* set the MPEG_CLK_INTL for the calculated data rate */
 350                 if (tmp < 4)
 351                         val = 0x00;
 352                 else if (tmp < 8)
 353                         val = 0x01;
 354                 else if (tmp < 12)
 355                         val = 0x02;
 356                 else if (tmp < 16)
 357                         val = 0x03;
 358                 else if (tmp < 24)
 359                         val = 0x04;
 360                 else if (tmp < 32)
 361                         val = 0x05;
 362                 else
 363                         val = 0x06;
 364                 s5h1420_writereg(state, 0x22, val);
 365
 366                 /* DC freeze */
 367                 s5h1420_writereg(state, 0x1f, s5h1420_readreg(state, 0x1f) | 0x01);
 368
 369                 /* kicker disable + remove DC offset */
 370                 s5h1420_writereg(state, 0x05, s5h1420_readreg(state, 0x05) & 0x6f);
 371
 372                 /* post-lock processing has been done! */
 373                 state->postlocked = 1;
 374         }
 375
 376         return 0;
 377 }
 378
 379 static int s5h1420_read_ber(struct dvb_frontend* fe, u32* ber)
 380 {
 381         struct s5h1420_state* state = fe->demodulator_priv;
 382
 383         s5h1420_writereg(state, 0x46, 0x1d);
 384         mdelay(25);
 385
 386         *ber = (s5h1420_readreg(state, 0x48) << 8) | s5h1420_readreg(state, 0x47);
 387
 388         return 0;
 389 }
 390
 391 static int s5h1420_read_signal_strength(struct dvb_frontend* fe, u16* strength)
 392 {
 393         struct s5h1420_state* state = fe->demodulator_priv;
 394
 395         u8 val = s5h1420_readreg(state, 0x15);
 396
 397         *strength =  (u16) ((val << 8) | val);
 398
 399         return 0;
 400 }
 401
 402 static int s5h1420_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
 403 {
 404         struct s5h1420_state* state = fe->demodulator_priv;
 405
 406         s5h1420_writereg(state, 0x46, 0x1f);
 407         mdelay(25);
 408
 409         *ucblocks = (s5h1420_readreg(state, 0x48) << 8) | s5h1420_readreg(state, 0x47);
 410
 411         return 0;
 412 }
 413
 414 static void s5h1420_reset(struct s5h1420_state* state)
 415 {
 416         s5h1420_writereg (state, 0x01, 0x08);
 417         s5h1420_writereg (state, 0x01, 0x00);
 418         udelay(10);
 419 }
 420
 421 static void s5h1420_setsymbolrate(struct s5h1420_state* state,
 422                                   struct dvb_frontend_parameters *p)
 423 {
 424         u64 val;
 425
 426         val = ((u64) p->u.qpsk.symbol_rate / 1000ULL) * (1ULL<<24);
 427         if (p->u.qpsk.symbol_rate <= 21000000) {
 428                 val *= 2;
 429         }
 430         do_div(val, (state->fclk / 1000));
 431
 432         s5h1420_writereg(state, 0x09, s5h1420_readreg(state, 0x09) & 0x7f);
 433         s5h1420_writereg(state, 0x11, val >> 16);
 434         s5h1420_writereg(state, 0x12, val >> 8);
 435         s5h1420_writereg(state, 0x13, val & 0xff);
 436         s5h1420_writereg(state, 0x09, s5h1420_readreg(state, 0x09) | 0x80);
 437 }
 438
 439 static u32 s5h1420_getsymbolrate(struct s5h1420_state* state)
 440 {
 441         u64 val = 0;
 442         int sampling = 2;
 443
 444         if (s5h1420_readreg(state, 0x05) & 0x2)
 445                 sampling = 1;
 446
 447         s5h1420_writereg(state, 0x06, s5h1420_readreg(state, 0x06) | 0x08);
 448         val  = s5h1420_readreg(state, 0x11) << 16;
 449         val |= s5h1420_readreg(state, 0x12) << 8;
 450         val |= s5h1420_readreg(state, 0x13);
 451         s5h1420_writereg(state, 0x06, s5h1420_readreg(state, 0x06) & 0xf7);
 452
 453         val *= (state->fclk / 1000ULL);
 454         do_div(val, ((1<<24) * sampling));
 455
 456         return (u32) (val * 1000ULL);
 457 }
 458
 459 static void s5h1420_setfreqoffset(struct s5h1420_state* state, int freqoffset)
 460 {
 461         int val;
 462
 463         /* remember freqoffset is in kHz, but the chip wants the offset in Hz, so
 464          * divide fclk by 1000000 to get the correct value. */
 465         val = -(int) ((freqoffset * (1<<24)) / (state->fclk / 1000000));
 466
 467         s5h1420_writereg(state, 0x09, s5h1420_readreg(state, 0x09) & 0xbf);
 468         s5h1420_writereg(state, 0x0e, val >> 16);
 469         s5h1420_writereg(state, 0x0f, val >> 8);
 470         s5h1420_writereg(state, 0x10, val & 0xff);
 471         s5h1420_writereg(state, 0x09, s5h1420_readreg(state, 0x09) | 0x40);
 472 }
 473
 474 static int s5h1420_getfreqoffset(struct s5h1420_state* state)
 475 {
 476         int val;
 477
 478         s5h1420_writereg(state, 0x06, s5h1420_readreg(state, 0x06) | 0x08);
 479         val  = s5h1420_readreg(state, 0x0e) << 16;
 480         val |= s5h1420_readreg(state, 0x0f) << 8;
 481         val |= s5h1420_readreg(state, 0x10);
 482         s5h1420_writereg(state, 0x06, s5h1420_readreg(state, 0x06) & 0xf7);
 483
 484         if (val & 0x800000)
 485                 val |= 0xff000000;
 486
 487         /* remember freqoffset is in kHz, but the chip wants the offset in Hz, so
 488          * divide fclk by 1000000 to get the correct value. */
 489         val = (((-val) * (state->fclk/1000000)) / (1<<24));
 490
 491         return val;
 492 }
 493
 494 static void s5h1420_setfec_inversion(struct s5h1420_state* state,
 495                                      struct dvb_frontend_parameters *p)
 496 {
 497         u8 inversion = 0;
 498
 499         if (p->inversion == INVERSION_OFF) {
 500                 inversion = state->config->invert ? 0x08 : 0;
 501         } else if (p->inversion == INVERSION_ON) {
 502                 inversion = state->config->invert ? 0 : 0x08;
 503         }
 504
 505         if ((p->u.qpsk.fec_inner == FEC_AUTO) || (p->inversion == INVERSION_AUTO)) {
 506                 s5h1420_writereg(state, 0x30, 0x3f);
 507                 s5h1420_writereg(state, 0x31, 0x00 | inversion);
 508         } else {
 509                 switch(p->u.qpsk.fec_inner) {
 510                 case FEC_1_2:
 511                         s5h1420_writereg(state, 0x30, 0x01);
 512                         s5h1420_writereg(state, 0x31, 0x10 | inversion);
 513                         break;
 514
 515                 case FEC_2_3:
 516                         s5h1420_writereg(state, 0x30, 0x02);
 517                         s5h1420_writereg(state, 0x31, 0x11 | inversion);
 518                         break;
 519
 520                 case FEC_3_4:
 521                         s5h1420_writereg(state, 0x30, 0x04);
 522                         s5h1420_writereg(state, 0x31, 0x12 | inversion);
 523                         break;
 524
 525                 case FEC_5_6:
 526                         s5h1420_writereg(state, 0x30, 0x08);
 527                         s5h1420_writereg(state, 0x31, 0x13 | inversion);
 528                         break;
 529
 530                 case FEC_6_7:
 531                         s5h1420_writereg(state, 0x30, 0x10);
 532                         s5h1420_writereg(state, 0x31, 0x14 | inversion);
 533                         break;
 534
 535                 case FEC_7_8:
 536                         s5h1420_writereg(state, 0x30, 0x20);
 537                         s5h1420_writereg(state, 0x31, 0x15 | inversion);
 538                         break;
 539
 540                 default:
 541                         return;
 542                 }
 543         }
 544 }
 545
 546 static fe_code_rate_t s5h1420_getfec(struct s5h1420_state* state)
 547 {
 548         switch(s5h1420_readreg(state, 0x32) & 0x07) {
 549         case 0:
 550                 return FEC_1_2;
 551
 552         case 1:
 553                 return FEC_2_3;
 554
 555         case 2:
 556                 return FEC_3_4;
 557
 558         case 3:
 559                 return FEC_5_6;
 560
 561         case 4:
 562                 return FEC_6_7;
 563
 564         case 5:
 565                 return FEC_7_8;
 566         }
 567
 568         return FEC_NONE;
 569 }
 570
 571 static fe_spectral_inversion_t s5h1420_getinversion(struct s5h1420_state* state)
 572 {
 573         if (s5h1420_readreg(state, 0x32) & 0x08)
 574                 return INVERSION_ON;
 575
 576         return INVERSION_OFF;
 577 }
 578
 579 static int s5h1420_set_frontend(struct dvb_frontend* fe,
 580                                 struct dvb_frontend_parameters *p)
 581 {
 582         struct s5h1420_state* state = fe->demodulator_priv;
 583         int frequency_delta;
 584         struct dvb_frontend_tune_settings fesettings;
 585         u32 tmp;
 586
 587         /* check if we should do a fast-tune */
 588         memcpy(&fesettings.parameters, p, sizeof(struct dvb_frontend_parameters));
 589         s5h1420_get_tune_settings(fe, &fesettings);
 590         frequency_delta = p->frequency - state->tunedfreq;
 591         if ((frequency_delta > -fesettings.max_drift) &&
 592             (frequency_delta < fesettings.max_drift) &&
 593             (frequency_delta != 0) &&
 594             (state->fec_inner == p->u.qpsk.fec_inner) &&
 595             (state->symbol_rate == p->u.qpsk.symbol_rate)) {
 596
 597                 if (state->config->pll_set) {
 598                         s5h1420_writereg (state, 0x02, s5h1420_readreg(state,0x02) | 1);
 599                         state->config->pll_set(fe, p, &tmp);
 600                         s5h1420_setfreqoffset(state, p->frequency - tmp);
 601                 }
 602                 return 0;
 603         }
 604
 605         /* first of all, software reset */
 606         s5h1420_reset(state);
 607
 608         /* set s5h1420 fclk PLL according to desired symbol rate */
 609         if (p->u.qpsk.symbol_rate > 28000000) {
 610                 state->fclk = 88000000;
 611                 s5h1420_writereg(state, 0x03, 0x50);
 612                 s5h1420_writereg(state, 0x04, 0x40);
 613                 s5h1420_writereg(state, 0x05, 0xae);
 614         } else if (p->u.qpsk.symbol_rate > 21000000) {
 615                 state->fclk = 59000000;
 616                 s5h1420_writereg(state, 0x03, 0x33);
 617                 s5h1420_writereg(state, 0x04, 0x40);
 618                 s5h1420_writereg(state, 0x05, 0xae);
 619         } else {
 620                 state->fclk = 88000000;
 621                 s5h1420_writereg(state, 0x03, 0x50);
 622                 s5h1420_writereg(state, 0x04, 0x40);
 623                 s5h1420_writereg(state, 0x05, 0xac);
 624         }
 625
 626         /* set misc registers */
 627         s5h1420_writereg(state, 0x02, 0x00);
 628         s5h1420_writereg(state, 0x06, 0x00);
 629         s5h1420_writereg(state, 0x07, 0xb0);
 630         s5h1420_writereg(state, 0x0a, 0xe7);
 631         s5h1420_writereg(state, 0x0b, 0x78);
 632         s5h1420_writereg(state, 0x0c, 0x48);
 633         s5h1420_writereg(state, 0x0d, 0x6b);
 634         s5h1420_writereg(state, 0x2e, 0x8e);
 635         s5h1420_writereg(state, 0x35, 0x33);
 636         s5h1420_writereg(state, 0x38, 0x01);
 637         s5h1420_writereg(state, 0x39, 0x7d);
 638         s5h1420_writereg(state, 0x3a, (state->fclk + (TONE_FREQ * 32) - 1) / (TONE_FREQ * 32));
 639         s5h1420_writereg(state, 0x3c, 0x00);
 640         s5h1420_writereg(state, 0x45, 0x61);
 641         s5h1420_writereg(state, 0x46, 0x1d);
 642
 643         /* start QPSK */
 644         s5h1420_writereg(state, 0x05, s5h1420_readreg(state, 0x05) | 1);
 645
 646         /* set tuner PLL */
 647         if (state->config->pll_set) {
 648                 s5h1420_writereg (state, 0x02, s5h1420_readreg(state,0x02) | 1);
 649                 state->config->pll_set(fe, p, &tmp);
 650                 s5h1420_setfreqoffset(state, 0);
 651         }
 652
 653         /* set the reset of the parameters */
 654         s5h1420_setsymbolrate(state, p);
 655         s5h1420_setfec_inversion(state, p);
 656
 657         state->fec_inner = p->u.qpsk.fec_inner;
 658         state->symbol_rate = p->u.qpsk.symbol_rate;
 659         state->postlocked = 0;
 660         state->tunedfreq = p->frequency;
 661         return 0;
 662 }
 663
 664 static int s5h1420_get_frontend(struct dvb_frontend* fe,
 665                                 struct dvb_frontend_parameters *p)
 666 {
 667         struct s5h1420_state* state = fe->demodulator_priv;
 668
 669         p->frequency = state->tunedfreq + s5h1420_getfreqoffset(state);
 670         p->inversion = s5h1420_getinversion(state);
 671         p->u.qpsk.symbol_rate = s5h1420_getsymbolrate(state);
 672         p->u.qpsk.fec_inner = s5h1420_getfec(state);
 673
 674         return 0;
 675 }
 676
 677 static int s5h1420_get_tune_settings(struct dvb_frontend* fe,
 678                                      struct dvb_frontend_tune_settings* fesettings)
 679 {
 680         if (fesettings->parameters.u.qpsk.symbol_rate > 20000000) {
 681                 fesettings->min_delay_ms = 50;
 682                 fesettings->step_size = 2000;
 683                 fesettings->max_drift = 8000;
 684         } else if (fesettings->parameters.u.qpsk.symbol_rate > 12000000) {
 685                 fesettings->min_delay_ms = 100;
 686                 fesettings->step_size = 1500;
 687                 fesettings->max_drift = 9000;
 688         } else if (fesettings->parameters.u.qpsk.symbol_rate > 8000000) {
 689                 fesettings->min_delay_ms = 100;
 690                 fesettings->step_size = 1000;
 691                 fesettings->max_drift = 8000;
 692         } else if (fesettings->parameters.u.qpsk.symbol_rate > 4000000) {
 693                 fesettings->min_delay_ms = 100;
 694                 fesettings->step_size = 500;
 695                 fesettings->max_drift = 7000;
 696         } else if (fesettings->parameters.u.qpsk.symbol_rate > 2000000) {
 697                 fesettings->min_delay_ms = 200;
 698                 fesettings->step_size = (fesettings->parameters.u.qpsk.symbol_rate / 8000);
 699                 fesettings->max_drift = 14 * fesettings->step_size;
 700         } else {
 701                 fesettings->min_delay_ms = 200;
 702                 fesettings->step_size = (fesettings->parameters.u.qpsk.symbol_rate / 8000);
 703                 fesettings->max_drift = 18 * fesettings->step_size;
 704         }
 705
 706         return 0;
 707 }
 708
 709 static int s5h1420_init (struct dvb_frontend* fe)
 710 {
 711         struct s5h1420_state* state = fe->demodulator_priv;
 712
 713         /* disable power down and do reset */
 714         s5h1420_writereg(state, 0x02, 0x10);
 715         msleep(10);
 716         s5h1420_reset(state);
 717
 718         /* init PLL */
 719         if (state->config->pll_init) {
 720                 s5h1420_writereg (state, 0x02, s5h1420_readreg(state,0x02) | 1);
 721                 state->config->pll_init(fe);
 722                 s5h1420_writereg (state, 0x02, s5h1420_readreg(state,0x02) & 0xfe);
 723         }
 724
 725         return 0;
 726 }
 727
 728 static int s5h1420_sleep(struct dvb_frontend* fe)
 729 {
 730         struct s5h1420_state* state = fe->demodulator_priv;
 731
 732         return s5h1420_writereg(state, 0x02, 0x12);
 733 }
 734
 735 static void s5h1420_release(struct dvb_frontend* fe)
 736 {
 737         struct s5h1420_state* state = fe->demodulator_priv;
 738         kfree(state);
 739 }
 740
 741 static struct dvb_frontend_ops s5h1420_ops;
 742
 743 struct dvb_frontend* s5h1420_attach(const struct s5h1420_config* config,
 744                                     struct i2c_adapter* i2c)
 745 {
 746         struct s5h1420_state* state = NULL;
 747         u8 identity;
 748
 749         /* allocate memory for the internal state */
 750         state = kmalloc(sizeof(struct s5h1420_state), GFP_KERNEL);
 751         if (state == NULL)
 752                 goto error;
 753
 754         /* setup the state */
 755         state->config = config;
 756         state->i2c = i2c;
 757         memcpy(&state->ops, &s5h1420_ops, sizeof(struct dvb_frontend_ops));
 758         state->postlocked = 0;
 759         state->fclk = 88000000;
 760         state->tunedfreq = 0;
 761         state->fec_inner = FEC_NONE;
 762         state->symbol_rate = 0;
 763
 764         /* check if the demod is there + identify it */
 765         identity = s5h1420_readreg(state, 0x00);
 766         if (identity != 0x03)
 767                 goto error;
 768
 769         /* create dvb_frontend */
 770         state->frontend.ops = &state->ops;
 771         state->frontend.demodulator_priv = state;
 772         return &state->frontend;
 773
 774 error:
 775         kfree(state);
 776         return NULL;
 777 }
 778
 779 static struct dvb_frontend_ops s5h1420_ops = {
 780
 781         .info = {
 782                 .name     = "Samsung S5H1420 DVB-S",
 783                 .type     = FE_QPSK,
 784                 .frequency_min    = 950000,
 785                 .frequency_max    = 2150000,
 786                 .frequency_stepsize = 125,     /* kHz for QPSK frontends */
 787                 .frequency_tolerance  = 29500,
 788                 .symbol_rate_min  = 1000000,
 789                 .symbol_rate_max  = 45000000,
 790                 /*  .symbol_rate_tolerance  = ???,*/
 791                 .caps = FE_CAN_INVERSION_AUTO |
 792                 FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 793                 FE_CAN_FEC_5_6 | FE_CAN_FEC_6_7 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
 794                 FE_CAN_QPSK
 795         },
 796
 797         .release = s5h1420_release,
 798
 799         .init = s5h1420_init,
 800         .sleep = s5h1420_sleep,
 801
 802         .set_frontend = s5h1420_set_frontend,
 803         .get_frontend = s5h1420_get_frontend,
 804         .get_tune_settings = s5h1420_get_tune_settings,
 805
 806         .read_status = s5h1420_read_status,
 807         .read_ber = s5h1420_read_ber,
 808         .read_signal_strength = s5h1420_read_signal_strength,
 809         .read_ucblocks = s5h1420_read_ucblocks,
 810
 811         .diseqc_send_master_cmd = s5h1420_send_master_cmd,
 812         .diseqc_recv_slave_reply = s5h1420_recv_slave_reply,
 813         .diseqc_send_burst = s5h1420_send_burst,
 814         .set_tone = s5h1420_set_tone,
 815         .set_voltage = s5h1420_set_voltage,
 816 };
 817
 818 module_param(debug, int, 0644);
 819
 820 MODULE_DESCRIPTION("Samsung S5H1420 DVB-S Demodulator driver");
 821 MODULE_AUTHOR("Andrew de Quincey");
 822 MODULE_LICENSE("GPL");
 823
 824 EXPORT_SYMBOL(s5h1420_attach);