git.oblomov.eu Git - linux-2.6/blob - drivers/media/dvb/frontends/si21xx.c

   1 /* DVB compliant Linux driver for the DVB-S si2109/2110 demodulator
   2 *
   3 * Copyright (C) 2008 Igor M. Liplianin (liplianin@me.by)
   4 *
   5 *       This program is free software; you can redistribute it and/or modify
   6 *       it under the terms of the GNU General Public License as published by
   7 *       the Free Software Foundation; either version 2 of the License, or
   8 *       (at your option) any later version.
   9 *
  10 */
  11 #include <linux/init.h>
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/string.h>
  15 #include <linux/slab.h>
  16 #include <linux/jiffies.h>
  17 #include <asm/div64.h>
  18
  19 #include "dvb_frontend.h"
  20 #include "si21xx.h"
  21
  22 #define REVISION_REG                    0x00
  23 #define SYSTEM_MODE_REG                 0x01
  24 #define TS_CTRL_REG_1                   0x02
  25 #define TS_CTRL_REG_2                   0x03
  26 #define PIN_CTRL_REG_1                  0x04
  27 #define PIN_CTRL_REG_2                  0x05
  28 #define LOCK_STATUS_REG_1               0x0f
  29 #define LOCK_STATUS_REG_2               0x10
  30 #define ACQ_STATUS_REG                  0x11
  31 #define ACQ_CTRL_REG_1                  0x13
  32 #define ACQ_CTRL_REG_2                  0x14
  33 #define PLL_DIVISOR_REG                 0x15
  34 #define COARSE_TUNE_REG                 0x16
  35 #define FINE_TUNE_REG_L                 0x17
  36 #define FINE_TUNE_REG_H                 0x18
  37
  38 #define ANALOG_AGC_POWER_LEVEL_REG      0x28
  39 #define CFO_ESTIMATOR_CTRL_REG_1        0x29
  40 #define CFO_ESTIMATOR_CTRL_REG_2        0x2a
  41 #define CFO_ESTIMATOR_CTRL_REG_3        0x2b
  42
  43 #define SYM_RATE_ESTIMATE_REG_L         0x31
  44 #define SYM_RATE_ESTIMATE_REG_M         0x32
  45 #define SYM_RATE_ESTIMATE_REG_H         0x33
  46
  47 #define CFO_ESTIMATOR_OFFSET_REG_L      0x36
  48 #define CFO_ESTIMATOR_OFFSET_REG_H      0x37
  49 #define CFO_ERROR_REG_L                 0x38
  50 #define CFO_ERROR_REG_H                 0x39
  51 #define SYM_RATE_ESTIMATOR_CTRL_REG     0x3a
  52
  53 #define SYM_RATE_REG_L                  0x3f
  54 #define SYM_RATE_REG_M                  0x40
  55 #define SYM_RATE_REG_H                  0x41
  56 #define SYM_RATE_ESTIMATOR_MAXIMUM_REG  0x42
  57 #define SYM_RATE_ESTIMATOR_MINIMUM_REG  0x43
  58
  59 #define C_N_ESTIMATOR_CTRL_REG          0x7c
  60 #define C_N_ESTIMATOR_THRSHLD_REG       0x7d
  61 #define C_N_ESTIMATOR_LEVEL_REG_L       0x7e
  62 #define C_N_ESTIMATOR_LEVEL_REG_H       0x7f
  63
  64 #define BLIND_SCAN_CTRL_REG             0x80
  65
  66 #define LSA_CTRL_REG_1                  0x8D
  67 #define SPCTRM_TILT_CORR_THRSHLD_REG    0x8f
  68 #define ONE_DB_BNDWDTH_THRSHLD_REG      0x90
  69 #define TWO_DB_BNDWDTH_THRSHLD_REG      0x91
  70 #define THREE_DB_BNDWDTH_THRSHLD_REG    0x92
  71 #define INBAND_POWER_THRSHLD_REG        0x93
  72 #define REF_NOISE_LVL_MRGN_THRSHLD_REG  0x94
  73
  74 #define VIT_SRCH_CTRL_REG_1             0xa0
  75 #define VIT_SRCH_CTRL_REG_2             0xa1
  76 #define VIT_SRCH_CTRL_REG_3             0xa2
  77 #define VIT_SRCH_STATUS_REG             0xa3
  78 #define VITERBI_BER_COUNT_REG_L         0xab
  79 #define REED_SOLOMON_CTRL_REG           0xb0
  80 #define REED_SOLOMON_ERROR_COUNT_REG_L  0xb1
  81 #define PRBS_CTRL_REG                   0xb5
  82
  83 #define LNB_CTRL_REG_1                  0xc0
  84 #define LNB_CTRL_REG_2                  0xc1
  85 #define LNB_CTRL_REG_3                  0xc2
  86 #define LNB_CTRL_REG_4                  0xc3
  87 #define LNB_CTRL_STATUS_REG             0xc4
  88 #define LNB_FIFO_REGS_0                 0xc5
  89 #define LNB_FIFO_REGS_1                 0xc6
  90 #define LNB_FIFO_REGS_2                 0xc7
  91 #define LNB_FIFO_REGS_3                 0xc8
  92 #define LNB_FIFO_REGS_4                 0xc9
  93 #define LNB_FIFO_REGS_5                 0xca
  94 #define LNB_SUPPLY_CTRL_REG_1           0xcb
  95 #define LNB_SUPPLY_CTRL_REG_2           0xcc
  96 #define LNB_SUPPLY_CTRL_REG_3           0xcd
  97 #define LNB_SUPPLY_CTRL_REG_4           0xce
  98 #define LNB_SUPPLY_STATUS_REG           0xcf
  99
 100 #define FALSE   0
 101 #define TRUE    1
 102 #define FAIL    -1
 103 #define PASS    0
 104
 105 #define ALLOWABLE_FS_COUNT      10
 106 #define STATUS_BER              0
 107 #define STATUS_UCBLOCKS         1
 108
 109 static int debug;
 110 #define dprintk(args...) \
 111         do { \
 112                 if (debug) \
 113                         printk(KERN_DEBUG "si21xx: " args); \
 114         } while (0)
 115
 116 enum {
 117         ACTIVE_HIGH,
 118         ACTIVE_LOW
 119 };
 120 enum {
 121         BYTE_WIDE,
 122         BIT_WIDE
 123 };
 124 enum {
 125         CLK_GAPPED_MODE,
 126         CLK_CONTINUOUS_MODE
 127 };
 128 enum {
 129         RISING_EDGE,
 130         FALLING_EDGE
 131 };
 132 enum {
 133         MSB_FIRST,
 134         LSB_FIRST
 135 };
 136 enum {
 137         SERIAL,
 138         PARALLEL
 139 };
 140
 141 struct si21xx_state {
 142         struct i2c_adapter *i2c;
 143         const struct si21xx_config *config;
 144         struct dvb_frontend frontend;
 145         u8 initialised:1;
 146         int errmode;
 147         int fs;                 /*Sampling rate of the ADC in MHz*/
 148 };
 149
 150 /*      register default initialization */
 151 static u8 serit_sp1511lhb_inittab[] = {
 152         0x01, 0x28,     /* set i2c_inc_disable */
 153         0x20, 0x03,
 154         0x27, 0x20,
 155         0xe0, 0x45,
 156         0xe1, 0x08,
 157         0xfe, 0x01,
 158         0x01, 0x28,
 159         0x89, 0x09,
 160         0x04, 0x80,
 161         0x05, 0x01,
 162         0x06, 0x00,
 163         0x20, 0x03,
 164         0x24, 0x88,
 165         0x29, 0x09,
 166         0x2a, 0x0f,
 167         0x2c, 0x10,
 168         0x2d, 0x19,
 169         0x2e, 0x08,
 170         0x2f, 0x10,
 171         0x30, 0x19,
 172         0x34, 0x20,
 173         0x35, 0x03,
 174         0x45, 0x02,
 175         0x46, 0x45,
 176         0x47, 0xd0,
 177         0x48, 0x00,
 178         0x49, 0x40,
 179         0x4a, 0x03,
 180         0x4c, 0xfd,
 181         0x4f, 0x2e,
 182         0x50, 0x2e,
 183         0x51, 0x10,
 184         0x52, 0x10,
 185         0x56, 0x92,
 186         0x59, 0x00,
 187         0x5a, 0x2d,
 188         0x5b, 0x33,
 189         0x5c, 0x1f,
 190         0x5f, 0x76,
 191         0x62, 0xc0,
 192         0x63, 0xc0,
 193         0x64, 0xf3,
 194         0x65, 0xf3,
 195         0x79, 0x40,
 196         0x6a, 0x40,
 197         0x6b, 0x0a,
 198         0x6c, 0x80,
 199         0x6d, 0x27,
 200         0x71, 0x06,
 201         0x75, 0x60,
 202         0x78, 0x00,
 203         0x79, 0xb5,
 204         0x7c, 0x05,
 205         0x7d, 0x1a,
 206         0x87, 0x55,
 207         0x88, 0x72,
 208         0x8f, 0x08,
 209         0x90, 0xe0,
 210         0x94, 0x40,
 211         0xa0, 0x3f,
 212         0xa1, 0xc0,
 213         0xa4, 0xcc,
 214         0xa5, 0x66,
 215         0xa6, 0x66,
 216         0xa7, 0x7b,
 217         0xa8, 0x7b,
 218         0xa9, 0x7b,
 219         0xaa, 0x9a,
 220         0xed, 0x04,
 221         0xad, 0x00,
 222         0xae, 0x03,
 223         0xcc, 0xab,
 224         0x01, 0x08,
 225         0xff, 0xff
 226 };
 227
 228 /*      low level read/writes */
 229 static int si21_writeregs(struct si21xx_state *state, u8 reg1,
 230                                                         u8 *data, int len)
 231 {
 232         int ret;
 233         u8 buf[60];/* = { reg1, data };*/
 234         struct i2c_msg msg = {
 235                                 .addr = state->config->demod_address,
 236                                 .flags = 0,
 237                                 .buf = buf,
 238                                 .len = len + 1
 239         };
 240
 241         msg.buf[0] =  reg1;
 242         memcpy(msg.buf + 1, data, len);
 243
 244         ret = i2c_transfer(state->i2c, &msg, 1);
 245
 246         if (ret != 1)
 247                 dprintk("%s: writereg error (reg1 == 0x%02x, data == 0x%02x, "
 248                         "ret == %i)\n", __func__, reg1, data[0], ret);
 249
 250         return (ret != 1) ? -EREMOTEIO : 0;
 251 }
 252
 253 static int si21_writereg(struct si21xx_state *state, u8 reg, u8 data)
 254 {
 255         int ret;
 256         u8 buf[] = { reg, data };
 257         struct i2c_msg msg = {
 258                                 .addr = state->config->demod_address,
 259                                 .flags = 0,
 260                                 .buf = buf,
 261                                 .len = 2
 262         };
 263
 264         ret = i2c_transfer(state->i2c, &msg, 1);
 265
 266         if (ret != 1)
 267                 dprintk("%s: writereg error (reg == 0x%02x, data == 0x%02x, "
 268                         "ret == %i)\n", __func__, reg, data, ret);
 269
 270         return (ret != 1) ? -EREMOTEIO : 0;
 271 }
 272
 273 static int si21_write(struct dvb_frontend *fe, u8 *buf, int len)
 274 {
 275         struct si21xx_state *state = fe->demodulator_priv;
 276
 277         if (len != 2)
 278                 return -EINVAL;
 279
 280         return si21_writereg(state, buf[0], buf[1]);
 281 }
 282
 283 static u8 si21_readreg(struct si21xx_state *state, u8 reg)
 284 {
 285         int ret;
 286         u8 b0[] = { reg };
 287         u8 b1[] = { 0 };
 288         struct i2c_msg msg[] = {
 289                 {
 290                         .addr = state->config->demod_address,
 291                         .flags = 0,
 292                         .buf = b0,
 293                         .len = 1
 294                 }, {
 295                         .addr = state->config->demod_address,
 296                         .flags = I2C_M_RD,
 297                         .buf = b1,
 298                         .len = 1
 299                 }
 300         };
 301
 302         ret = i2c_transfer(state->i2c, msg, 2);
 303
 304         if (ret != 2)
 305                 dprintk("%s: readreg error (reg == 0x%02x, ret == %i)\n",
 306                         __func__, reg, ret);
 307
 308         return b1[0];
 309 }
 310
 311 static int si21_readregs(struct si21xx_state *state, u8 reg1, u8 *b, u8 len)
 312 {
 313         int ret;
 314         struct i2c_msg msg[] = {
 315                 {
 316                         .addr = state->config->demod_address,
 317                         .flags = 0,
 318                         .buf = &reg1,
 319                         .len = 1
 320                 }, {
 321                         .addr = state->config->demod_address,
 322                         .flags = I2C_M_RD,
 323                         .buf = b,
 324                         .len = len
 325                 }
 326         };
 327
 328         ret = i2c_transfer(state->i2c, msg, 2);
 329
 330         if (ret != 2)
 331                 dprintk("%s: readreg error (ret == %i)\n", __func__, ret);
 332
 333         return ret == 2 ? 0 : -1;
 334 }
 335
 336 static int si21xx_wait_diseqc_idle(struct si21xx_state *state, int timeout)
 337 {
 338         unsigned long start = jiffies;
 339
 340         dprintk("%s\n", __func__);
 341
 342         while ((si21_readreg(state, LNB_CTRL_REG_1) & 0x8) == 8) {
 343                 if (jiffies - start > timeout) {
 344                         dprintk("%s: timeout!!\n", __func__);
 345                         return -ETIMEDOUT;
 346                 }
 347                 msleep(10);
 348         };
 349
 350         return 0;
 351 }
 352
 353 static int si21xx_set_symbolrate(struct dvb_frontend *fe, u32 srate)
 354 {
 355         struct si21xx_state *state = fe->demodulator_priv;
 356         u32 sym_rate, data_rate;
 357         int i;
 358         u8 sym_rate_bytes[3];
 359
 360         dprintk("%s : srate = %i\n", __func__ , srate);
 361
 362         if ((srate < 1000000) || (srate > 45000000))
 363                 return -EINVAL;
 364
 365         data_rate = srate;
 366         sym_rate = 0;
 367
 368         for (i = 0; i < 4; ++i) {
 369                 sym_rate /= 100;
 370                 sym_rate = sym_rate + ((data_rate % 100) * 0x800000) /
 371                                                                 state->fs;
 372                 data_rate /= 100;
 373         }
 374         for (i = 0; i < 3; ++i)
 375                 sym_rate_bytes[i] = (u8)((sym_rate >> (i * 8)) & 0xff);
 376
 377         si21_writeregs(state, SYM_RATE_REG_L, sym_rate_bytes, 0x03);
 378
 379         return 0;
 380 }
 381
 382 static int si21xx_send_diseqc_msg(struct dvb_frontend *fe,
 383                                         struct dvb_diseqc_master_cmd *m)
 384 {
 385         struct si21xx_state *state = fe->demodulator_priv;
 386         u8 lnb_status;
 387         u8 LNB_CTRL_1;
 388         int status;
 389
 390         dprintk("%s\n", __func__);
 391
 392         status = PASS;
 393         LNB_CTRL_1 = 0;
 394
 395         status |= si21_readregs(state, LNB_CTRL_STATUS_REG, &lnb_status, 0x01);
 396         status |= si21_readregs(state, LNB_CTRL_REG_1, &lnb_status, 0x01);
 397
 398         /*fill the FIFO*/
 399         status |= si21_writeregs(state, LNB_FIFO_REGS_0, m->msg, m->msg_len);
 400
 401         LNB_CTRL_1 = (lnb_status & 0x70);
 402         LNB_CTRL_1 |= m->msg_len;
 403
 404         LNB_CTRL_1 |= 0x80;     /* begin LNB signaling */
 405
 406         status |= si21_writeregs(state, LNB_CTRL_REG_1, &LNB_CTRL_1, 0x01);
 407
 408         return status;
 409 }
 410
 411 static int si21xx_send_diseqc_burst(struct dvb_frontend *fe,
 412                                                 fe_sec_mini_cmd_t burst)
 413 {
 414         struct si21xx_state *state = fe->demodulator_priv;
 415         u8 val;
 416
 417         dprintk("%s\n", __func__);
 418
 419         if (si21xx_wait_diseqc_idle(state, 100) < 0)
 420                 return -ETIMEDOUT;
 421
 422         val = (0x80 | si21_readreg(state, 0xc1));
 423         if (si21_writereg(state, LNB_CTRL_REG_1,
 424                         burst == SEC_MINI_A ? (val & ~0x10) : (val | 0x10)))
 425                 return -EREMOTEIO;
 426
 427         if (si21xx_wait_diseqc_idle(state, 100) < 0)
 428                 return -ETIMEDOUT;
 429
 430         if (si21_writereg(state, LNB_CTRL_REG_1, val))
 431                 return -EREMOTEIO;
 432
 433         return 0;
 434 }
 435 /*      30.06.2008 */
 436 static int si21xx_set_tone(struct dvb_frontend *fe, fe_sec_tone_mode_t tone)
 437 {
 438         struct si21xx_state *state = fe->demodulator_priv;
 439         u8 val;
 440
 441         dprintk("%s\n", __func__);
 442         val = (0x80 | si21_readreg(state, LNB_CTRL_REG_1));
 443
 444         switch (tone) {
 445         case SEC_TONE_ON:
 446                 return si21_writereg(state, LNB_CTRL_REG_1, val | 0x20);
 447
 448         case SEC_TONE_OFF:
 449                 return si21_writereg(state, LNB_CTRL_REG_1, (val & ~0x20));
 450
 451         default:
 452                 return -EINVAL;
 453         }
 454 }
 455
 456 static int si21xx_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t volt)
 457 {
 458         struct si21xx_state *state = fe->demodulator_priv;
 459
 460         u8 val;
 461         dprintk("%s: %s\n", __func__,
 462                 volt == SEC_VOLTAGE_13 ? "SEC_VOLTAGE_13" :
 463                 volt == SEC_VOLTAGE_18 ? "SEC_VOLTAGE_18" : "??");
 464
 465
 466         val = (0x80 | si21_readreg(state, LNB_CTRL_REG_1));
 467
 468         switch (volt) {
 469         case SEC_VOLTAGE_18:
 470                 return si21_writereg(state, LNB_CTRL_REG_1, val | 0x40);
 471                 break;
 472         case SEC_VOLTAGE_13:
 473                 return si21_writereg(state, LNB_CTRL_REG_1, (val & ~0x40));
 474                 break;
 475         default:
 476                 return -EINVAL;
 477         };
 478 }
 479
 480 static int si21xx_init(struct dvb_frontend *fe)
 481 {
 482         struct si21xx_state *state = fe->demodulator_priv;
 483         int i;
 484         int status = 0;
 485         u8 reg1;
 486         u8 val;
 487         u8 reg2[2];
 488
 489         dprintk("%s\n", __func__);
 490
 491         for (i = 0; ; i += 2) {
 492                 reg1 = serit_sp1511lhb_inittab[i];
 493                 val = serit_sp1511lhb_inittab[i+1];
 494                 if (reg1 == 0xff && val == 0xff)
 495                         break;
 496                 si21_writeregs(state, reg1, &val, 1);
 497         }
 498
 499         /*DVB QPSK SYSTEM MODE REG*/
 500         reg1 = 0x08;
 501         si21_writeregs(state, SYSTEM_MODE_REG, &reg1, 0x01);
 502
 503         /*transport stream config*/
 504         /*
 505         mode = PARALLEL;
 506         sdata_form = LSB_FIRST;
 507         clk_edge = FALLING_EDGE;
 508         clk_mode = CLK_GAPPED_MODE;
 509         strt_len = BYTE_WIDE;
 510         sync_pol = ACTIVE_HIGH;
 511         val_pol = ACTIVE_HIGH;
 512         err_pol = ACTIVE_HIGH;
 513         sclk_rate = 0x00;
 514         parity = 0x00 ;
 515         data_delay = 0x00;
 516         clk_delay = 0x00;
 517         pclk_smooth = 0x00;
 518         */
 519         reg2[0] =
 520                 PARALLEL + (LSB_FIRST << 1)
 521                 + (FALLING_EDGE << 2) + (CLK_GAPPED_MODE << 3)
 522                 + (BYTE_WIDE << 4) + (ACTIVE_HIGH << 5)
 523                 + (ACTIVE_HIGH << 6) + (ACTIVE_HIGH << 7);
 524
 525         reg2[1] = 0;
 526         /*      sclk_rate + (parity << 2)
 527                 + (data_delay << 3) + (clk_delay << 4)
 528                 + (pclk_smooth << 5);
 529         */
 530         status |= si21_writeregs(state, TS_CTRL_REG_1, reg2, 0x02);
 531         if (status != 0)
 532                 dprintk(" %s : TS Set Error\n", __func__);
 533
 534         return 0;
 535
 536 }
 537
 538 static int si21_read_status(struct dvb_frontend *fe, fe_status_t *status)
 539 {
 540         struct si21xx_state *state = fe->demodulator_priv;
 541         u8 regs_read[2];
 542         u8 reg_read;
 543         u8 i;
 544         u8 lock;
 545         u8 signal = si21_readreg(state, ANALOG_AGC_POWER_LEVEL_REG);
 546
 547         si21_readregs(state, LOCK_STATUS_REG_1, regs_read, 0x02);
 548         reg_read = 0;
 549
 550         for (i = 0; i < 7; ++i)
 551                 reg_read |= ((regs_read[0] >> i) & 0x01) << (6 - i);
 552
 553         lock = ((reg_read & 0x7f) | (regs_read[1] & 0x80));
 554
 555         dprintk("%s : FE_READ_STATUS : VSTATUS: 0x%02x\n", __func__, lock);
 556         *status = 0;
 557
 558         if (signal > 10)
 559                 *status |= FE_HAS_SIGNAL;
 560
 561         if (lock & 0x2)
 562                 *status |= FE_HAS_CARRIER;
 563
 564         if (lock & 0x20)
 565                 *status |= FE_HAS_VITERBI;
 566
 567         if (lock & 0x40)
 568                 *status |= FE_HAS_SYNC;
 569
 570         if ((lock & 0x7b) == 0x7b)
 571                 *status |= FE_HAS_LOCK;
 572
 573         return 0;
 574 }
 575
 576 static int si21_read_signal_strength(struct dvb_frontend *fe, u16 *strength)
 577 {
 578         struct si21xx_state *state = fe->demodulator_priv;
 579
 580         /*status = si21_readreg(state, ANALOG_AGC_POWER_LEVEL_REG,
 581                                                 (u8*)agclevel, 0x01);*/
 582
 583         u16 signal = (3 * si21_readreg(state, 0x27) *
 584                                         si21_readreg(state, 0x28));
 585
 586         dprintk("%s : AGCPWR: 0x%02x%02x, signal=0x%04x\n", __func__,
 587                 si21_readreg(state, 0x27),
 588                 si21_readreg(state, 0x28), (int) signal);
 589
 590         signal  <<= 4;
 591         *strength = signal;
 592
 593         return 0;
 594 }
 595
 596 static int si21_read_ber(struct dvb_frontend *fe, u32 *ber)
 597 {
 598         struct si21xx_state *state = fe->demodulator_priv;
 599
 600         dprintk("%s\n", __func__);
 601
 602         if (state->errmode != STATUS_BER)
 603                 return 0;
 604
 605         *ber = (si21_readreg(state, 0x1d) << 8) |
 606                                 si21_readreg(state, 0x1e);
 607
 608         return 0;
 609 }
 610
 611 static int si21_read_snr(struct dvb_frontend *fe, u16 *snr)
 612 {
 613         struct si21xx_state *state = fe->demodulator_priv;
 614
 615         s32 xsnr = 0xffff - ((si21_readreg(state, 0x24) << 8) |
 616                                         si21_readreg(state, 0x25));
 617         xsnr = 3 * (xsnr - 0xa100);
 618         *snr = (xsnr > 0xffff) ? 0xffff : (xsnr < 0) ? 0 : xsnr;
 619
 620         dprintk("%s\n", __func__);
 621
 622         return 0;
 623 }
 624
 625 static int si21_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
 626 {
 627         struct si21xx_state *state = fe->demodulator_priv;
 628
 629         dprintk("%s\n", __func__);
 630
 631         if (state->errmode != STATUS_UCBLOCKS)
 632                 *ucblocks = 0;
 633         else
 634                 *ucblocks = (si21_readreg(state, 0x1d) << 8) |
 635                                         si21_readreg(state, 0x1e);
 636
 637         return 0;
 638 }
 639
 640 /*      initiates a channel acquisition sequence
 641         using the specified symbol rate and code rate */
 642 static int si21xx_setacquire(struct dvb_frontend *fe, int symbrate,
 643                                                 fe_code_rate_t crate)
 644 {
 645
 646         struct si21xx_state *state = fe->demodulator_priv;
 647         u8 coderates[] = {
 648                                 0x0, 0x01, 0x02, 0x04, 0x00,
 649                                 0x8, 0x10, 0x20, 0x00, 0x3f
 650         };
 651
 652         u8 coderate_ptr;
 653         int status;
 654         u8 start_acq = 0x80;
 655         u8 reg, regs[3];
 656
 657         dprintk("%s\n", __func__);
 658
 659         status = PASS;
 660         coderate_ptr = coderates[crate];
 661
 662         si21xx_set_symbolrate(fe, symbrate);
 663
 664         /* write code rates to use in the Viterbi search */
 665         status |= si21_writeregs(state,
 666                                 VIT_SRCH_CTRL_REG_1,
 667                                 &coderate_ptr, 0x01);
 668
 669         /* clear acq_start bit */
 670         status |= si21_readregs(state, ACQ_CTRL_REG_2, &reg, 0x01);
 671         reg &= ~start_acq;
 672         status |= si21_writeregs(state, ACQ_CTRL_REG_2, &reg, 0x01);
 673
 674         /* use new Carrier Frequency Offset Estimator (QuickLock) */
 675         regs[0] = 0xCB;
 676         regs[1] = 0x40;
 677         regs[2] = 0xCB;
 678
 679         status |= si21_writeregs(state,
 680                                 TWO_DB_BNDWDTH_THRSHLD_REG,
 681                                 &regs[0], 0x03);
 682         reg = 0x56;
 683         status |= si21_writeregs(state,
 684                                 LSA_CTRL_REG_1, &reg, 1);
 685         reg = 0x05;
 686         status |= si21_writeregs(state,
 687                                 BLIND_SCAN_CTRL_REG, &reg, 1);
 688         /* start automatic acq */
 689         status |= si21_writeregs(state,
 690                                 ACQ_CTRL_REG_2, &start_acq, 0x01);
 691
 692         return status;
 693 }
 694
 695 static int si21xx_set_property(struct dvb_frontend *fe, struct dtv_property *p)
 696 {
 697         dprintk("%s(..)\n", __func__);
 698         return 0;
 699 }
 700
 701 static int si21xx_get_property(struct dvb_frontend *fe, struct dtv_property *p)
 702 {
 703         dprintk("%s(..)\n", __func__);
 704         return 0;
 705 }
 706
 707 static int si21xx_set_frontend(struct dvb_frontend *fe,
 708                                         struct dvb_frontend_parameters *dfp)
 709 {
 710         struct si21xx_state *state = fe->demodulator_priv;
 711         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 712
 713         /* freq         Channel carrier frequency in KHz (i.e. 1550000 KHz)
 714          datarate       Channel symbol rate in Sps (i.e. 22500000 Sps)*/
 715
 716         /* in MHz */
 717         unsigned char coarse_tune_freq;
 718         int fine_tune_freq;
 719         unsigned char sample_rate = 0;
 720         /* boolean */
 721         unsigned int inband_interferer_ind;
 722
 723         /* INTERMEDIATE VALUES */
 724         int icoarse_tune_freq; /* MHz */
 725         int ifine_tune_freq; /* MHz */
 726         unsigned int band_high;
 727         unsigned int band_low;
 728         unsigned int x1;
 729         unsigned int x2;
 730         int i;
 731         unsigned int inband_interferer_div2[ALLOWABLE_FS_COUNT] = {
 732                         FALSE, FALSE, FALSE, FALSE, FALSE,
 733                         FALSE, FALSE, FALSE, FALSE, FALSE
 734         };
 735         unsigned int inband_interferer_div4[ALLOWABLE_FS_COUNT] = {
 736                         FALSE, FALSE, FALSE, FALSE, FALSE,
 737                         FALSE, FALSE, FALSE, FALSE, FALSE
 738         };
 739
 740         int status;
 741
 742         /* allowable sample rates for ADC in MHz */
 743         int afs[ALLOWABLE_FS_COUNT] = { 200, 192, 193, 194, 195,
 744                                         196, 204, 205, 206, 207
 745         };
 746         /* in MHz */
 747         int if_limit_high;
 748         int if_limit_low;
 749         int lnb_lo;
 750         int lnb_uncertanity;
 751
 752         int rf_freq;
 753         int data_rate;
 754         unsigned char regs[4];
 755
 756         dprintk("%s : FE_SET_FRONTEND\n", __func__);
 757
 758         if (c->delivery_system != SYS_DVBS) {
 759                         dprintk("%s: unsupported delivery system selected (%d)\n",
 760                                 __func__, c->delivery_system);
 761                         return -EOPNOTSUPP;
 762         }
 763
 764         for (i = 0; i < ALLOWABLE_FS_COUNT; ++i)
 765                 inband_interferer_div2[i] = inband_interferer_div4[i] = FALSE;
 766
 767         if_limit_high = -700000;
 768         if_limit_low = -100000;
 769         /* in MHz */
 770         lnb_lo = 0;
 771         lnb_uncertanity = 0;
 772
 773         rf_freq = 10 * c->frequency ;
 774         data_rate = c->symbol_rate / 100;
 775
 776         status = PASS;
 777
 778         band_low = (rf_freq - lnb_lo) - ((lnb_uncertanity * 200)
 779                                         + (data_rate * 135)) / 200;
 780
 781         band_high = (rf_freq - lnb_lo) + ((lnb_uncertanity * 200)
 782                                         + (data_rate * 135)) / 200;
 783
 784
 785         icoarse_tune_freq = 100000 *
 786                                 (((rf_freq - lnb_lo) -
 787                                         (if_limit_low + if_limit_high) / 2)
 788                                                                 / 100000);
 789
 790         ifine_tune_freq = (rf_freq - lnb_lo) - icoarse_tune_freq ;
 791
 792         for (i = 0; i < ALLOWABLE_FS_COUNT; ++i) {
 793                 x1 = ((rf_freq - lnb_lo) / (afs[i] * 2500)) *
 794                                         (afs[i] * 2500) + afs[i] * 2500;
 795
 796                 x2 = ((rf_freq - lnb_lo) / (afs[i] * 2500)) *
 797                                                         (afs[i] * 2500);
 798
 799                 if (((band_low < x1) && (x1 < band_high)) ||
 800                                         ((band_low < x2) && (x2 < band_high)))
 801                                         inband_interferer_div4[i] = TRUE;
 802
 803         }
 804
 805         for (i = 0; i < ALLOWABLE_FS_COUNT; ++i) {
 806                 x1 = ((rf_freq - lnb_lo) / (afs[i] * 5000)) *
 807                                         (afs[i] * 5000) + afs[i] * 5000;
 808
 809                 x2 = ((rf_freq - lnb_lo) / (afs[i] * 5000)) *
 810                                         (afs[i] * 5000);
 811
 812                 if (((band_low < x1) && (x1 < band_high)) ||
 813                                         ((band_low < x2) && (x2 < band_high)))
 814                                         inband_interferer_div2[i] = TRUE;
 815         }
 816
 817         inband_interferer_ind = TRUE;
 818         for (i = 0; i < ALLOWABLE_FS_COUNT; ++i)
 819                 inband_interferer_ind &= inband_interferer_div2[i] |
 820                                                 inband_interferer_div4[i];
 821
 822         if (inband_interferer_ind) {
 823                 for (i = 0; i < ALLOWABLE_FS_COUNT; ++i) {
 824                         if (inband_interferer_div2[i] == FALSE) {
 825                                 sample_rate = (u8) afs[i];
 826                                 break;
 827                         }
 828                 }
 829         } else {
 830                 for (i = 0; i < ALLOWABLE_FS_COUNT; ++i) {
 831                         if ((inband_interferer_div2[i] |
 832                                         inband_interferer_div4[i]) == FALSE) {
 833                                 sample_rate = (u8) afs[i];
 834                                 break;
 835                         }
 836                 }
 837
 838         }
 839
 840         if (sample_rate > 207 || sample_rate < 192)
 841                 sample_rate = 200;
 842
 843         fine_tune_freq = ((0x4000 * (ifine_tune_freq / 10)) /
 844                                         ((sample_rate) * 1000));
 845
 846         coarse_tune_freq = (u8)(icoarse_tune_freq / 100000);
 847
 848         regs[0] = sample_rate;
 849         regs[1] = coarse_tune_freq;
 850         regs[2] = fine_tune_freq & 0xFF;
 851         regs[3] = fine_tune_freq >> 8 & 0xFF;
 852
 853         status |= si21_writeregs(state, PLL_DIVISOR_REG, &regs[0], 0x04);
 854
 855         state->fs = sample_rate;/*ADC MHz*/
 856         si21xx_setacquire(fe, c->symbol_rate, c->fec_inner);
 857
 858         return 0;
 859 }
 860
 861 static int si21xx_sleep(struct dvb_frontend *fe)
 862 {
 863         struct si21xx_state *state = fe->demodulator_priv;
 864         u8 regdata;
 865
 866         dprintk("%s\n", __func__);
 867
 868         si21_readregs(state, SYSTEM_MODE_REG, &regdata, 0x01);
 869         regdata |= 1 << 6;
 870         si21_writeregs(state, SYSTEM_MODE_REG, &regdata, 0x01);
 871         state->initialised = 0;
 872
 873         return 0;
 874 }
 875
 876 static void si21xx_release(struct dvb_frontend *fe)
 877 {
 878         struct si21xx_state *state = fe->demodulator_priv;
 879
 880         dprintk("%s\n", __func__);
 881
 882         kfree(state);
 883 }
 884
 885 static struct dvb_frontend_ops si21xx_ops = {
 886
 887         .info = {
 888                 .name                   = "SL SI21XX DVB-S",
 889                 .type                   = FE_QPSK,
 890                 .frequency_min          = 950000,
 891                 .frequency_max          = 2150000,
 892                 .frequency_stepsize     = 125,   /* kHz for QPSK frontends */
 893                 .frequency_tolerance    = 0,
 894                 .symbol_rate_min        = 1000000,
 895                 .symbol_rate_max        = 45000000,
 896                 .symbol_rate_tolerance  = 500,  /* ppm */
 897                 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 898                 FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 |
 899                 FE_CAN_QPSK |
 900                 FE_CAN_FEC_AUTO
 901         },
 902
 903         .release = si21xx_release,
 904         .init = si21xx_init,
 905         .sleep = si21xx_sleep,
 906         .write = si21_write,
 907         .read_status = si21_read_status,
 908         .read_ber = si21_read_ber,
 909         .read_signal_strength = si21_read_signal_strength,
 910         .read_snr = si21_read_snr,
 911         .read_ucblocks = si21_read_ucblocks,
 912         .diseqc_send_master_cmd = si21xx_send_diseqc_msg,
 913         .diseqc_send_burst = si21xx_send_diseqc_burst,
 914         .set_tone = si21xx_set_tone,
 915         .set_voltage = si21xx_set_voltage,
 916
 917         .set_property = si21xx_set_property,
 918         .get_property = si21xx_get_property,
 919         .set_frontend = si21xx_set_frontend,
 920 };
 921
 922 struct dvb_frontend *si21xx_attach(const struct si21xx_config *config,
 923                                                 struct i2c_adapter *i2c)
 924 {
 925         struct si21xx_state *state = NULL;
 926         int id;
 927
 928         dprintk("%s\n", __func__);
 929
 930         /* allocate memory for the internal state */
 931         state = kmalloc(sizeof(struct si21xx_state), GFP_KERNEL);
 932         if (state == NULL)
 933                 goto error;
 934
 935         /* setup the state */
 936         state->config = config;
 937         state->i2c = i2c;
 938         state->initialised = 0;
 939         state->errmode = STATUS_BER;
 940
 941         /* check if the demod is there */
 942         id = si21_readreg(state, SYSTEM_MODE_REG);
 943         si21_writereg(state, SYSTEM_MODE_REG, id | 0x40); /* standby off */
 944         msleep(200);
 945         id = si21_readreg(state, 0x00);
 946
 947         /* register 0x00 contains:
 948                 0x34 for SI2107
 949                 0x24 for SI2108
 950                 0x14 for SI2109
 951                 0x04 for SI2110
 952         */
 953         if (id != 0x04 && id != 0x14)
 954                 goto error;
 955
 956         /* create dvb_frontend */
 957         memcpy(&state->frontend.ops, &si21xx_ops,
 958                                         sizeof(struct dvb_frontend_ops));
 959         state->frontend.demodulator_priv = state;
 960         return &state->frontend;
 961
 962 error:
 963         kfree(state);
 964         return NULL;
 965 }
 966 EXPORT_SYMBOL(si21xx_attach);
 967
 968 module_param(debug, int, 0644);
 969 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
 970
 971 MODULE_DESCRIPTION("SL SI21XX DVB Demodulator driver");
 972 MODULE_AUTHOR("Igor M. Liplianin");
 973 MODULE_LICENSE("GPL");