drivers/media/pci/pt1/va1j5jf8007s.c

   1 /*
   2  * ISDB-S driver for VA1J5JF8007/VA1J5JF8011
   3  *
   4  * Copyright (C) 2009 HIRANO Takahito <hiranotaka@zng.info>
   5  *
   6  * based on pt1dvr - http://pt1dvr.sourceforge.jp/
   7  *      by Tomoaki Ishikawa <tomy@users.sourceforge.jp>
   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  * GNU General Public License for more details.
  18  */
  19
  20 #include <linux/kernel.h>
  21 #include <linux/module.h>
  22 #include <linux/slab.h>
  23 #include <linux/i2c.h>
  24 #include "dvb_frontend.h"
  25 #include "va1j5jf8007s.h"
  26
  27 enum va1j5jf8007s_tune_state {
  28         VA1J5JF8007S_IDLE,
  29         VA1J5JF8007S_SET_FREQUENCY_1,
  30         VA1J5JF8007S_SET_FREQUENCY_2,
  31         VA1J5JF8007S_SET_FREQUENCY_3,
  32         VA1J5JF8007S_CHECK_FREQUENCY,
  33         VA1J5JF8007S_SET_MODULATION,
  34         VA1J5JF8007S_CHECK_MODULATION,
  35         VA1J5JF8007S_SET_TS_ID,
  36         VA1J5JF8007S_CHECK_TS_ID,
  37         VA1J5JF8007S_TRACK,
  38 };
  39
  40 struct va1j5jf8007s_state {
  41         const struct va1j5jf8007s_config *config;
  42         struct i2c_adapter *adap;
  43         struct dvb_frontend fe;
  44         enum va1j5jf8007s_tune_state tune_state;
  45 };
  46
  47 static int va1j5jf8007s_read_snr(struct dvb_frontend *fe, u16 *snr)
  48 {
  49         struct va1j5jf8007s_state *state;
  50         u8 addr;
  51         int i;
  52         u8 write_buf[1], read_buf[1];
  53         struct i2c_msg msgs[2];
  54         s32 word, x1, x2, x3, x4, x5, y;
  55
  56         state = fe->demodulator_priv;
  57         addr = state->config->demod_address;
  58
  59         word = 0;
  60         for (i = 0; i < 2; i++) {
  61                 write_buf[0] = 0xbc + i;
  62
  63                 msgs[0].addr = addr;
  64                 msgs[0].flags = 0;
  65                 msgs[0].len = sizeof(write_buf);
  66                 msgs[0].buf = write_buf;
  67
  68                 msgs[1].addr = addr;
  69                 msgs[1].flags = I2C_M_RD;
  70                 msgs[1].len = sizeof(read_buf);
  71                 msgs[1].buf = read_buf;
  72
  73                 if (i2c_transfer(state->adap, msgs, 2) != 2)
  74                         return -EREMOTEIO;
  75
  76                 word <<= 8;
  77                 word |= read_buf[0];
  78         }
  79
  80         word -= 3000;
  81         if (word < 0)
  82                 word = 0;
  83
  84         x1 = int_sqrt(word << 16) * ((15625ll << 21) / 1000000);
  85         x2 = (s64)x1 * x1 >> 31;
  86         x3 = (s64)x2 * x1 >> 31;
  87         x4 = (s64)x2 * x2 >> 31;
  88         x5 = (s64)x4 * x1 >> 31;
  89
  90         y = (58857ll << 23) / 1000;
  91         y -= (s64)x1 * ((89565ll << 24) / 1000) >> 30;
  92         y += (s64)x2 * ((88977ll << 24) / 1000) >> 28;
  93         y -= (s64)x3 * ((50259ll << 25) / 1000) >> 27;
  94         y += (s64)x4 * ((14341ll << 27) / 1000) >> 27;
  95         y -= (s64)x5 * ((16346ll << 30) / 10000) >> 28;
  96
  97         *snr = y < 0 ? 0 : y >> 15;
  98         return 0;
  99 }
 100
 101 static int va1j5jf8007s_get_frontend_algo(struct dvb_frontend *fe)
 102 {
 103         return DVBFE_ALGO_HW;
 104 }
 105
 106 static int
 107 va1j5jf8007s_read_status(struct dvb_frontend *fe, enum fe_status *status)
 108 {
 109         struct va1j5jf8007s_state *state;
 110
 111         state = fe->demodulator_priv;
 112
 113         switch (state->tune_state) {
 114         case VA1J5JF8007S_IDLE:
 115         case VA1J5JF8007S_SET_FREQUENCY_1:
 116         case VA1J5JF8007S_SET_FREQUENCY_2:
 117         case VA1J5JF8007S_SET_FREQUENCY_3:
 118         case VA1J5JF8007S_CHECK_FREQUENCY:
 119                 *status = 0;
 120                 return 0;
 121
 122
 123         case VA1J5JF8007S_SET_MODULATION:
 124         case VA1J5JF8007S_CHECK_MODULATION:
 125                 *status |= FE_HAS_SIGNAL;
 126                 return 0;
 127
 128         case VA1J5JF8007S_SET_TS_ID:
 129         case VA1J5JF8007S_CHECK_TS_ID:
 130                 *status |= FE_HAS_SIGNAL | FE_HAS_CARRIER;
 131                 return 0;
 132
 133         case VA1J5JF8007S_TRACK:
 134                 *status |= FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_LOCK;
 135                 return 0;
 136         }
 137
 138         BUG();
 139 }
 140
 141 struct va1j5jf8007s_cb_map {
 142         u32 frequency;
 143         u8 cb;
 144 };
 145
 146 static const struct va1j5jf8007s_cb_map va1j5jf8007s_cb_maps[] = {
 147         {  986000, 0xb2 },
 148         { 1072000, 0xd2 },
 149         { 1154000, 0xe2 },
 150         { 1291000, 0x20 },
 151         { 1447000, 0x40 },
 152         { 1615000, 0x60 },
 153         { 1791000, 0x80 },
 154         { 1972000, 0xa0 },
 155 };
 156
 157 static u8 va1j5jf8007s_lookup_cb(u32 frequency)
 158 {
 159         int i;
 160         const struct va1j5jf8007s_cb_map *map;
 161
 162         for (i = 0; i < ARRAY_SIZE(va1j5jf8007s_cb_maps); i++) {
 163                 map = &va1j5jf8007s_cb_maps[i];
 164                 if (frequency < map->frequency)
 165                         return map->cb;
 166         }
 167         return 0xc0;
 168 }
 169
 170 static int va1j5jf8007s_set_frequency_1(struct va1j5jf8007s_state *state)
 171 {
 172         u32 frequency;
 173         u16 word;
 174         u8 buf[6];
 175         struct i2c_msg msg;
 176
 177         frequency = state->fe.dtv_property_cache.frequency;
 178
 179         word = (frequency + 500) / 1000;
 180         if (frequency < 1072000)
 181                 word = (word << 1 & ~0x1f) | (word & 0x0f);
 182
 183         buf[0] = 0xfe;
 184         buf[1] = 0xc0;
 185         buf[2] = 0x40 | word >> 8;
 186         buf[3] = word;
 187         buf[4] = 0xe0;
 188         buf[5] = va1j5jf8007s_lookup_cb(frequency);
 189
 190         msg.addr = state->config->demod_address;
 191         msg.flags = 0;
 192         msg.len = sizeof(buf);
 193         msg.buf = buf;
 194
 195         if (i2c_transfer(state->adap, &msg, 1) != 1)
 196                 return -EREMOTEIO;
 197
 198         return 0;
 199 }
 200
 201 static int va1j5jf8007s_set_frequency_2(struct va1j5jf8007s_state *state)
 202 {
 203         u8 buf[3];
 204         struct i2c_msg msg;
 205
 206         buf[0] = 0xfe;
 207         buf[1] = 0xc0;
 208         buf[2] = 0xe4;
 209
 210         msg.addr = state->config->demod_address;
 211         msg.flags = 0;
 212         msg.len = sizeof(buf);
 213         msg.buf = buf;
 214
 215         if (i2c_transfer(state->adap, &msg, 1) != 1)
 216                 return -EREMOTEIO;
 217
 218         return 0;
 219 }
 220
 221 static int va1j5jf8007s_set_frequency_3(struct va1j5jf8007s_state *state)
 222 {
 223         u32 frequency;
 224         u8 buf[4];
 225         struct i2c_msg msg;
 226
 227         frequency = state->fe.dtv_property_cache.frequency;
 228
 229         buf[0] = 0xfe;
 230         buf[1] = 0xc0;
 231         buf[2] = 0xf4;
 232         buf[3] = va1j5jf8007s_lookup_cb(frequency) | 0x4;
 233
 234         msg.addr = state->config->demod_address;
 235         msg.flags = 0;
 236         msg.len = sizeof(buf);
 237         msg.buf = buf;
 238
 239         if (i2c_transfer(state->adap, &msg, 1) != 1)
 240                 return -EREMOTEIO;
 241
 242         return 0;
 243 }
 244
 245 static int
 246 va1j5jf8007s_check_frequency(struct va1j5jf8007s_state *state, int *lock)
 247 {
 248         u8 addr;
 249         u8 write_buf[2], read_buf[1];
 250         struct i2c_msg msgs[2];
 251
 252         addr = state->config->demod_address;
 253
 254         write_buf[0] = 0xfe;
 255         write_buf[1] = 0xc1;
 256
 257         msgs[0].addr = addr;
 258         msgs[0].flags = 0;
 259         msgs[0].len = sizeof(write_buf);
 260         msgs[0].buf = write_buf;
 261
 262         msgs[1].addr = addr;
 263         msgs[1].flags = I2C_M_RD;
 264         msgs[1].len = sizeof(read_buf);
 265         msgs[1].buf = read_buf;
 266
 267         if (i2c_transfer(state->adap, msgs, 2) != 2)
 268                 return -EREMOTEIO;
 269
 270         *lock = read_buf[0] & 0x40;
 271         return 0;
 272 }
 273
 274 static int va1j5jf8007s_set_modulation(struct va1j5jf8007s_state *state)
 275 {
 276         u8 buf[2];
 277         struct i2c_msg msg;
 278
 279         buf[0] = 0x03;
 280         buf[1] = 0x01;
 281
 282         msg.addr = state->config->demod_address;
 283         msg.flags = 0;
 284         msg.len = sizeof(buf);
 285         msg.buf = buf;
 286
 287         if (i2c_transfer(state->adap, &msg, 1) != 1)
 288                 return -EREMOTEIO;
 289
 290         return 0;
 291 }
 292
 293 static int
 294 va1j5jf8007s_check_modulation(struct va1j5jf8007s_state *state, int *lock)
 295 {
 296         u8 addr;
 297         u8 write_buf[1], read_buf[1];
 298         struct i2c_msg msgs[2];
 299
 300         addr = state->config->demod_address;
 301
 302         write_buf[0] = 0xc3;
 303
 304         msgs[0].addr = addr;
 305         msgs[0].flags = 0;
 306         msgs[0].len = sizeof(write_buf);
 307         msgs[0].buf = write_buf;
 308
 309         msgs[1].addr = addr;
 310         msgs[1].flags = I2C_M_RD;
 311         msgs[1].len = sizeof(read_buf);
 312         msgs[1].buf = read_buf;
 313
 314         if (i2c_transfer(state->adap, msgs, 2) != 2)
 315                 return -EREMOTEIO;
 316
 317         *lock = !(read_buf[0] & 0x10);
 318         return 0;
 319 }
 320
 321 static int
 322 va1j5jf8007s_set_ts_id(struct va1j5jf8007s_state *state)
 323 {
 324         u32 ts_id;
 325         u8 buf[3];
 326         struct i2c_msg msg;
 327
 328         ts_id = state->fe.dtv_property_cache.stream_id;
 329         if (!ts_id || ts_id == NO_STREAM_ID_FILTER)
 330                 return 0;
 331
 332         buf[0] = 0x8f;
 333         buf[1] = ts_id >> 8;
 334         buf[2] = ts_id;
 335
 336         msg.addr = state->config->demod_address;
 337         msg.flags = 0;
 338         msg.len = sizeof(buf);
 339         msg.buf = buf;
 340
 341         if (i2c_transfer(state->adap, &msg, 1) != 1)
 342                 return -EREMOTEIO;
 343
 344         return 0;
 345 }
 346
 347 static int
 348 va1j5jf8007s_check_ts_id(struct va1j5jf8007s_state *state, int *lock)
 349 {
 350         u8 addr;
 351         u8 write_buf[1], read_buf[2];
 352         struct i2c_msg msgs[2];
 353         u32 ts_id;
 354
 355         ts_id = state->fe.dtv_property_cache.stream_id;
 356         if (!ts_id || ts_id == NO_STREAM_ID_FILTER) {
 357                 *lock = 1;
 358                 return 0;
 359         }
 360
 361         addr = state->config->demod_address;
 362
 363         write_buf[0] = 0xe6;
 364
 365         msgs[0].addr = addr;
 366         msgs[0].flags = 0;
 367         msgs[0].len = sizeof(write_buf);
 368         msgs[0].buf = write_buf;
 369
 370         msgs[1].addr = addr;
 371         msgs[1].flags = I2C_M_RD;
 372         msgs[1].len = sizeof(read_buf);
 373         msgs[1].buf = read_buf;
 374
 375         if (i2c_transfer(state->adap, msgs, 2) != 2)
 376                 return -EREMOTEIO;
 377
 378         *lock = (read_buf[0] << 8 | read_buf[1]) == ts_id;
 379         return 0;
 380 }
 381
 382 static int
 383 va1j5jf8007s_tune(struct dvb_frontend *fe,
 384                   bool re_tune,
 385                   unsigned int mode_flags,  unsigned int *delay,
 386                   enum fe_status *status)
 387 {
 388         struct va1j5jf8007s_state *state;
 389         int ret;
 390         int lock = 0;
 391
 392         state = fe->demodulator_priv;
 393
 394         if (re_tune)
 395                 state->tune_state = VA1J5JF8007S_SET_FREQUENCY_1;
 396
 397         switch (state->tune_state) {
 398         case VA1J5JF8007S_IDLE:
 399                 *delay = 3 * HZ;
 400                 *status = 0;
 401                 return 0;
 402
 403         case VA1J5JF8007S_SET_FREQUENCY_1:
 404                 ret = va1j5jf8007s_set_frequency_1(state);
 405                 if (ret < 0)
 406                         return ret;
 407
 408                 state->tune_state = VA1J5JF8007S_SET_FREQUENCY_2;
 409                 *delay = 0;
 410                 *status = 0;
 411                 return 0;
 412
 413         case VA1J5JF8007S_SET_FREQUENCY_2:
 414                 ret = va1j5jf8007s_set_frequency_2(state);
 415                 if (ret < 0)
 416                         return ret;
 417
 418                 state->tune_state = VA1J5JF8007S_SET_FREQUENCY_3;
 419                 *delay = (HZ + 99) / 100;
 420                 *status = 0;
 421                 return 0;
 422
 423         case VA1J5JF8007S_SET_FREQUENCY_3:
 424                 ret = va1j5jf8007s_set_frequency_3(state);
 425                 if (ret < 0)
 426                         return ret;
 427
 428                 state->tune_state = VA1J5JF8007S_CHECK_FREQUENCY;
 429                 *delay = 0;
 430                 *status = 0;
 431                 return 0;
 432
 433         case VA1J5JF8007S_CHECK_FREQUENCY:
 434                 ret = va1j5jf8007s_check_frequency(state, &lock);
 435                 if (ret < 0)
 436                         return ret;
 437
 438                 if (!lock)  {
 439                         *delay = (HZ + 999) / 1000;
 440                         *status = 0;
 441                         return 0;
 442                 }
 443
 444                 state->tune_state = VA1J5JF8007S_SET_MODULATION;
 445                 *delay = 0;
 446                 *status = FE_HAS_SIGNAL;
 447                 return 0;
 448
 449         case VA1J5JF8007S_SET_MODULATION:
 450                 ret = va1j5jf8007s_set_modulation(state);
 451                 if (ret < 0)
 452                         return ret;
 453
 454                 state->tune_state = VA1J5JF8007S_CHECK_MODULATION;
 455                 *delay = 0;
 456                 *status = FE_HAS_SIGNAL;
 457                 return 0;
 458
 459         case VA1J5JF8007S_CHECK_MODULATION:
 460                 ret = va1j5jf8007s_check_modulation(state, &lock);
 461                 if (ret < 0)
 462                         return ret;
 463
 464                 if (!lock)  {
 465                         *delay = (HZ + 49) / 50;
 466                         *status = FE_HAS_SIGNAL;
 467                         return 0;
 468                 }
 469
 470                 state->tune_state = VA1J5JF8007S_SET_TS_ID;
 471                 *delay = 0;
 472                 *status = FE_HAS_SIGNAL | FE_HAS_CARRIER;
 473                 return 0;
 474
 475         case VA1J5JF8007S_SET_TS_ID:
 476                 ret = va1j5jf8007s_set_ts_id(state);
 477                 if (ret < 0)
 478                         return ret;
 479
 480                 state->tune_state = VA1J5JF8007S_CHECK_TS_ID;
 481                 return 0;
 482
 483         case VA1J5JF8007S_CHECK_TS_ID:
 484                 ret = va1j5jf8007s_check_ts_id(state, &lock);
 485                 if (ret < 0)
 486                         return ret;
 487
 488                 if (!lock)  {
 489                         *delay = (HZ + 99) / 100;
 490                         *status = FE_HAS_SIGNAL | FE_HAS_CARRIER;
 491                         return 0;
 492                 }
 493
 494                 state->tune_state = VA1J5JF8007S_TRACK;
 495                 /* fall through */
 496
 497         case VA1J5JF8007S_TRACK:
 498                 *delay = 3 * HZ;
 499                 *status = FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_LOCK;
 500                 return 0;
 501         }
 502
 503         BUG();
 504 }
 505
 506 static int va1j5jf8007s_init_frequency(struct va1j5jf8007s_state *state)
 507 {
 508         u8 buf[4];
 509         struct i2c_msg msg;
 510
 511         buf[0] = 0xfe;
 512         buf[1] = 0xc0;
 513         buf[2] = 0xf0;
 514         buf[3] = 0x04;
 515
 516         msg.addr = state->config->demod_address;
 517         msg.flags = 0;
 518         msg.len = sizeof(buf);
 519         msg.buf = buf;
 520
 521         if (i2c_transfer(state->adap, &msg, 1) != 1)
 522                 return -EREMOTEIO;
 523
 524         return 0;
 525 }
 526
 527 static int va1j5jf8007s_set_sleep(struct va1j5jf8007s_state *state, int sleep)
 528 {
 529         u8 buf[2];
 530         struct i2c_msg msg;
 531
 532         buf[0] = 0x17;
 533         buf[1] = sleep ? 0x01 : 0x00;
 534
 535         msg.addr = state->config->demod_address;
 536         msg.flags = 0;
 537         msg.len = sizeof(buf);
 538         msg.buf = buf;
 539
 540         if (i2c_transfer(state->adap, &msg, 1) != 1)
 541                 return -EREMOTEIO;
 542
 543         return 0;
 544 }
 545
 546 static int va1j5jf8007s_sleep(struct dvb_frontend *fe)
 547 {
 548         struct va1j5jf8007s_state *state;
 549         int ret;
 550
 551         state = fe->demodulator_priv;
 552
 553         ret = va1j5jf8007s_init_frequency(state);
 554         if (ret < 0)
 555                 return ret;
 556
 557         return va1j5jf8007s_set_sleep(state, 1);
 558 }
 559
 560 static int va1j5jf8007s_init(struct dvb_frontend *fe)
 561 {
 562         struct va1j5jf8007s_state *state;
 563
 564         state = fe->demodulator_priv;
 565         state->tune_state = VA1J5JF8007S_IDLE;
 566
 567         return va1j5jf8007s_set_sleep(state, 0);
 568 }
 569
 570 static void va1j5jf8007s_release(struct dvb_frontend *fe)
 571 {
 572         struct va1j5jf8007s_state *state;
 573         state = fe->demodulator_priv;
 574         kfree(state);
 575 }
 576
 577 static const struct dvb_frontend_ops va1j5jf8007s_ops = {
 578         .delsys = { SYS_ISDBS },
 579         .info = {
 580                 .name = "VA1J5JF8007/VA1J5JF8011 ISDB-S",
 581                 .frequency_min = 950000,
 582                 .frequency_max = 2150000,
 583                 .frequency_stepsize = 1000,
 584                 .caps = FE_CAN_INVERSION_AUTO | FE_CAN_FEC_AUTO |
 585                         FE_CAN_QAM_AUTO | FE_CAN_TRANSMISSION_MODE_AUTO |
 586                         FE_CAN_GUARD_INTERVAL_AUTO | FE_CAN_HIERARCHY_AUTO |
 587                         FE_CAN_MULTISTREAM,
 588         },
 589
 590         .read_snr = va1j5jf8007s_read_snr,
 591         .get_frontend_algo = va1j5jf8007s_get_frontend_algo,
 592         .read_status = va1j5jf8007s_read_status,
 593         .tune = va1j5jf8007s_tune,
 594         .sleep = va1j5jf8007s_sleep,
 595         .init = va1j5jf8007s_init,
 596         .release = va1j5jf8007s_release,
 597 };
 598
 599 static int va1j5jf8007s_prepare_1(struct va1j5jf8007s_state *state)
 600 {
 601         u8 addr;
 602         u8 write_buf[1], read_buf[1];
 603         struct i2c_msg msgs[2];
 604
 605         addr = state->config->demod_address;
 606
 607         write_buf[0] = 0x07;
 608
 609         msgs[0].addr = addr;
 610         msgs[0].flags = 0;
 611         msgs[0].len = sizeof(write_buf);
 612         msgs[0].buf = write_buf;
 613
 614         msgs[1].addr = addr;
 615         msgs[1].flags = I2C_M_RD;
 616         msgs[1].len = sizeof(read_buf);
 617         msgs[1].buf = read_buf;
 618
 619         if (i2c_transfer(state->adap, msgs, 2) != 2)
 620                 return -EREMOTEIO;
 621
 622         if (read_buf[0] != 0x41)
 623                 return -EIO;
 624
 625         return 0;
 626 }
 627
 628 static const u8 va1j5jf8007s_20mhz_prepare_bufs[][2] = {
 629         {0x04, 0x02}, {0x0d, 0x55}, {0x11, 0x40}, {0x13, 0x80}, {0x17, 0x01},
 630         {0x1c, 0x0a}, {0x1d, 0xaa}, {0x1e, 0x20}, {0x1f, 0x88}, {0x51, 0xb0},
 631         {0x52, 0x89}, {0x53, 0xb3}, {0x5a, 0x2d}, {0x5b, 0xd3}, {0x85, 0x69},
 632         {0x87, 0x04}, {0x8e, 0x02}, {0xa3, 0xf7}, {0xa5, 0xc0},
 633 };
 634
 635 static const u8 va1j5jf8007s_25mhz_prepare_bufs[][2] = {
 636         {0x04, 0x02}, {0x11, 0x40}, {0x13, 0x80}, {0x17, 0x01}, {0x1c, 0x0a},
 637         {0x1d, 0xaa}, {0x1e, 0x20}, {0x1f, 0x88}, {0x51, 0xb0}, {0x52, 0x89},
 638         {0x53, 0xb3}, {0x5a, 0x2d}, {0x5b, 0xd3}, {0x85, 0x69}, {0x87, 0x04},
 639         {0x8e, 0x26}, {0xa3, 0xf7}, {0xa5, 0xc0},
 640 };
 641
 642 static int va1j5jf8007s_prepare_2(struct va1j5jf8007s_state *state)
 643 {
 644         const u8 (*bufs)[2];
 645         int size;
 646         u8 addr;
 647         u8 buf[2];
 648         struct i2c_msg msg;
 649         int i;
 650
 651         switch (state->config->frequency) {
 652         case VA1J5JF8007S_20MHZ:
 653                 bufs = va1j5jf8007s_20mhz_prepare_bufs;
 654                 size = ARRAY_SIZE(va1j5jf8007s_20mhz_prepare_bufs);
 655                 break;
 656         case VA1J5JF8007S_25MHZ:
 657                 bufs = va1j5jf8007s_25mhz_prepare_bufs;
 658                 size = ARRAY_SIZE(va1j5jf8007s_25mhz_prepare_bufs);
 659                 break;
 660         default:
 661                 return -EINVAL;
 662         }
 663
 664         addr = state->config->demod_address;
 665
 666         msg.addr = addr;
 667         msg.flags = 0;
 668         msg.len = 2;
 669         msg.buf = buf;
 670         for (i = 0; i < size; i++) {
 671                 memcpy(buf, bufs[i], sizeof(buf));
 672                 if (i2c_transfer(state->adap, &msg, 1) != 1)
 673                         return -EREMOTEIO;
 674         }
 675
 676         return 0;
 677 }
 678
 679 /* must be called after va1j5jf8007t_attach */
 680 int va1j5jf8007s_prepare(struct dvb_frontend *fe)
 681 {
 682         struct va1j5jf8007s_state *state;
 683         int ret;
 684
 685         state = fe->demodulator_priv;
 686
 687         ret = va1j5jf8007s_prepare_1(state);
 688         if (ret < 0)
 689                 return ret;
 690
 691         ret = va1j5jf8007s_prepare_2(state);
 692         if (ret < 0)
 693                 return ret;
 694
 695         return va1j5jf8007s_init_frequency(state);
 696 }
 697
 698 struct dvb_frontend *
 699 va1j5jf8007s_attach(const struct va1j5jf8007s_config *config,
 700                     struct i2c_adapter *adap)
 701 {
 702         struct va1j5jf8007s_state *state;
 703         struct dvb_frontend *fe;
 704         u8 buf[2];
 705         struct i2c_msg msg;
 706
 707         state = kzalloc(sizeof(struct va1j5jf8007s_state), GFP_KERNEL);
 708         if (!state)
 709                 return NULL;
 710
 711         state->config = config;
 712         state->adap = adap;
 713
 714         fe = &state->fe;
 715         memcpy(&fe->ops, &va1j5jf8007s_ops, sizeof(struct dvb_frontend_ops));
 716         fe->demodulator_priv = state;
 717
 718         buf[0] = 0x01;
 719         buf[1] = 0x80;
 720
 721         msg.addr = state->config->demod_address;
 722         msg.flags = 0;
 723         msg.len = sizeof(buf);
 724         msg.buf = buf;
 725
 726         if (i2c_transfer(state->adap, &msg, 1) != 1) {
 727                 kfree(state);
 728                 return NULL;
 729         }
 730
 731         return fe;
 732 }