drivers/media/dvb/pt1/va1j5jf8007s.c

   1 /*
   2  * ISDB-S driver for VA1J5JF8007
   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  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23
  24 #include <linux/kernel.h>
  25 #include <linux/module.h>
  26 #include <linux/slab.h>
  27 #include <linux/i2c.h>
  28 #include "dvb_frontend.h"
  29 #include "va1j5jf8007s.h"
  30
  31 enum va1j5jf8007s_tune_state {
  32         VA1J5JF8007S_IDLE,
  33         VA1J5JF8007S_SET_FREQUENCY_1,
  34         VA1J5JF8007S_SET_FREQUENCY_2,
  35         VA1J5JF8007S_SET_FREQUENCY_3,
  36         VA1J5JF8007S_CHECK_FREQUENCY,
  37         VA1J5JF8007S_SET_MODULATION,
  38         VA1J5JF8007S_CHECK_MODULATION,
  39         VA1J5JF8007S_SET_TS_ID,
  40         VA1J5JF8007S_CHECK_TS_ID,
  41         VA1J5JF8007S_TRACK,
  42 };
  43
  44 struct va1j5jf8007s_state {
  45         const struct va1j5jf8007s_config *config;
  46         struct i2c_adapter *adap;
  47         struct dvb_frontend fe;
  48         enum va1j5jf8007s_tune_state tune_state;
  49 };
  50
  51 static int va1j5jf8007s_read_snr(struct dvb_frontend *fe, u16 *snr)
  52 {
  53         struct va1j5jf8007s_state *state;
  54         u8 addr;
  55         int i;
  56         u8 write_buf[1], read_buf[1];
  57         struct i2c_msg msgs[2];
  58         s32 word, x1, x2, x3, x4, x5, y;
  59
  60         state = fe->demodulator_priv;
  61         addr = state->config->demod_address;
  62
  63         word = 0;
  64         for (i = 0; i < 2; i++) {
  65                 write_buf[0] = 0xbc + i;
  66
  67                 msgs[0].addr = addr;
  68                 msgs[0].flags = 0;
  69                 msgs[0].len = sizeof(write_buf);
  70                 msgs[0].buf = write_buf;
  71
  72                 msgs[1].addr = addr;
  73                 msgs[1].flags = I2C_M_RD;
  74                 msgs[1].len = sizeof(read_buf);
  75                 msgs[1].buf = read_buf;
  76
  77                 if (i2c_transfer(state->adap, msgs, 2) != 2)
  78                         return -EREMOTEIO;
  79
  80                 word <<= 8;
  81                 word |= read_buf[0];
  82         }
  83
  84         word -= 3000;
  85         if (word < 0)
  86                 word = 0;
  87
  88         x1 = int_sqrt(word << 16) * ((15625ll << 21) / 1000000);
  89         x2 = (s64)x1 * x1 >> 31;
  90         x3 = (s64)x2 * x1 >> 31;
  91         x4 = (s64)x2 * x2 >> 31;
  92         x5 = (s64)x4 * x1 >> 31;
  93
  94         y = (58857ll << 23) / 1000;
  95         y -= (s64)x1 * ((89565ll << 24) / 1000) >> 30;
  96         y += (s64)x2 * ((88977ll << 24) / 1000) >> 28;
  97         y -= (s64)x3 * ((50259ll << 25) / 1000) >> 27;
  98         y += (s64)x4 * ((14341ll << 27) / 1000) >> 27;
  99         y -= (s64)x5 * ((16346ll << 30) / 10000) >> 28;
 100
 101         *snr = y < 0 ? 0 : y >> 15;
 102         return 0;
 103 }
 104
 105 static int va1j5jf8007s_get_frontend_algo(struct dvb_frontend *fe)
 106 {
 107         return DVBFE_ALGO_HW;
 108 }
 109
 110 static int
 111 va1j5jf8007s_read_status(struct dvb_frontend *fe, fe_status_t *status)
 112 {
 113         struct va1j5jf8007s_state *state;
 114
 115         state = fe->demodulator_priv;
 116
 117         switch (state->tune_state) {
 118         case VA1J5JF8007S_IDLE:
 119         case VA1J5JF8007S_SET_FREQUENCY_1:
 120         case VA1J5JF8007S_SET_FREQUENCY_2:
 121         case VA1J5JF8007S_SET_FREQUENCY_3:
 122         case VA1J5JF8007S_CHECK_FREQUENCY:
 123                 *status = 0;
 124                 return 0;
 125
 126
 127         case VA1J5JF8007S_SET_MODULATION:
 128         case VA1J5JF8007S_CHECK_MODULATION:
 129                 *status |= FE_HAS_SIGNAL;
 130                 return 0;
 131
 132         case VA1J5JF8007S_SET_TS_ID:
 133         case VA1J5JF8007S_CHECK_TS_ID:
 134                 *status |= FE_HAS_SIGNAL | FE_HAS_CARRIER;
 135                 return 0;
 136
 137         case VA1J5JF8007S_TRACK:
 138                 *status |= FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_LOCK;
 139                 return 0;
 140         }
 141
 142         BUG();
 143 }
 144
 145 struct va1j5jf8007s_cb_map {
 146         u32 frequency;
 147         u8 cb;
 148 };
 149
 150 static const struct va1j5jf8007s_cb_map va1j5jf8007s_cb_maps[] = {
 151         {  986000, 0xb2 },
 152         { 1072000, 0xd2 },
 153         { 1154000, 0xe2 },
 154         { 1291000, 0x20 },
 155         { 1447000, 0x40 },
 156         { 1615000, 0x60 },
 157         { 1791000, 0x80 },
 158         { 1972000, 0xa0 },
 159 };
 160
 161 static u8 va1j5jf8007s_lookup_cb(u32 frequency)
 162 {
 163         int i;
 164         const struct va1j5jf8007s_cb_map *map;
 165
 166         for (i = 0; i < ARRAY_SIZE(va1j5jf8007s_cb_maps); i++) {
 167                 map = &va1j5jf8007s_cb_maps[i];
 168                 if (frequency < map->frequency)
 169                         return map->cb;
 170         }
 171         return 0xc0;
 172 }
 173
 174 static int va1j5jf8007s_set_frequency_1(struct va1j5jf8007s_state *state)
 175 {
 176         u32 frequency;
 177         u16 word;
 178         u8 buf[6];
 179         struct i2c_msg msg;
 180
 181         frequency = state->fe.dtv_property_cache.frequency;
 182
 183         word = (frequency + 500) / 1000;
 184         if (frequency < 1072000)
 185                 word = (word << 1 & ~0x1f) | (word & 0x0f);
 186
 187         buf[0] = 0xfe;
 188         buf[1] = 0xc0;
 189         buf[2] = 0x40 | word >> 8;
 190         buf[3] = word;
 191         buf[4] = 0xe0;
 192         buf[5] = va1j5jf8007s_lookup_cb(frequency);
 193
 194         msg.addr = state->config->demod_address;
 195         msg.flags = 0;
 196         msg.len = sizeof(buf);
 197         msg.buf = buf;
 198
 199         if (i2c_transfer(state->adap, &msg, 1) != 1)
 200                 return -EREMOTEIO;
 201
 202         return 0;
 203 }
 204
 205 static int va1j5jf8007s_set_frequency_2(struct va1j5jf8007s_state *state)
 206 {
 207         u8 buf[3];
 208         struct i2c_msg msg;
 209
 210         buf[0] = 0xfe;
 211         buf[1] = 0xc0;
 212         buf[2] = 0xe4;
 213
 214         msg.addr = state->config->demod_address;
 215         msg.flags = 0;
 216         msg.len = sizeof(buf);
 217         msg.buf = buf;
 218
 219         if (i2c_transfer(state->adap, &msg, 1) != 1)
 220                 return -EREMOTEIO;
 221
 222         return 0;
 223 }
 224
 225 static int va1j5jf8007s_set_frequency_3(struct va1j5jf8007s_state *state)
 226 {
 227         u32 frequency;
 228         u8 buf[4];
 229         struct i2c_msg msg;
 230
 231         frequency = state->fe.dtv_property_cache.frequency;
 232
 233         buf[0] = 0xfe;
 234         buf[1] = 0xc0;
 235         buf[2] = 0xf4;
 236         buf[3] = va1j5jf8007s_lookup_cb(frequency) | 0x4;
 237
 238         msg.addr = state->config->demod_address;
 239         msg.flags = 0;
 240         msg.len = sizeof(buf);
 241         msg.buf = buf;
 242
 243         if (i2c_transfer(state->adap, &msg, 1) != 1)
 244                 return -EREMOTEIO;
 245
 246         return 0;
 247 }
 248
 249 static int
 250 va1j5jf8007s_check_frequency(struct va1j5jf8007s_state *state, int *lock)
 251 {
 252         u8 addr;
 253         u8 write_buf[2], read_buf[1];
 254         struct i2c_msg msgs[2];
 255
 256         addr = state->config->demod_address;
 257
 258         write_buf[0] = 0xfe;
 259         write_buf[1] = 0xc1;
 260
 261         msgs[0].addr = addr;
 262         msgs[0].flags = 0;
 263         msgs[0].len = sizeof(write_buf);
 264         msgs[0].buf = write_buf;
 265
 266         msgs[1].addr = addr;
 267         msgs[1].flags = I2C_M_RD;
 268         msgs[1].len = sizeof(read_buf);
 269         msgs[1].buf = read_buf;
 270
 271         if (i2c_transfer(state->adap, msgs, 2) != 2)
 272                 return -EREMOTEIO;
 273
 274         *lock = read_buf[0] & 0x40;
 275         return 0;
 276 }
 277
 278 static int va1j5jf8007s_set_modulation(struct va1j5jf8007s_state *state)
 279 {
 280         u8 buf[2];
 281         struct i2c_msg msg;
 282
 283         buf[0] = 0x03;
 284         buf[1] = 0x01;
 285
 286         msg.addr = state->config->demod_address;
 287         msg.flags = 0;
 288         msg.len = sizeof(buf);
 289         msg.buf = buf;
 290
 291         if (i2c_transfer(state->adap, &msg, 1) != 1)
 292                 return -EREMOTEIO;
 293
 294         return 0;
 295 }
 296
 297 static int
 298 va1j5jf8007s_check_modulation(struct va1j5jf8007s_state *state, int *lock)
 299 {
 300         u8 addr;
 301         u8 write_buf[1], read_buf[1];
 302         struct i2c_msg msgs[2];
 303
 304         addr = state->config->demod_address;
 305
 306         write_buf[0] = 0xc3;
 307
 308         msgs[0].addr = addr;
 309         msgs[0].flags = 0;
 310         msgs[0].len = sizeof(write_buf);
 311         msgs[0].buf = write_buf;
 312
 313         msgs[1].addr = addr;
 314         msgs[1].flags = I2C_M_RD;
 315         msgs[1].len = sizeof(read_buf);
 316         msgs[1].buf = read_buf;
 317
 318         if (i2c_transfer(state->adap, msgs, 2) != 2)
 319                 return -EREMOTEIO;
 320
 321         *lock = !(read_buf[0] & 0x10);
 322         return 0;
 323 }
 324
 325 static int
 326 va1j5jf8007s_set_ts_id(struct va1j5jf8007s_state *state)
 327 {
 328         u32 ts_id;
 329         u8 buf[3];
 330         struct i2c_msg msg;
 331
 332         ts_id = state->fe.dtv_property_cache.isdbs_ts_id;
 333         if (!ts_id)
 334                 return 0;
 335
 336         buf[0] = 0x8f;
 337         buf[1] = ts_id >> 8;
 338         buf[2] = ts_id;
 339
 340         msg.addr = state->config->demod_address;
 341         msg.flags = 0;
 342         msg.len = sizeof(buf);
 343         msg.buf = buf;
 344
 345         if (i2c_transfer(state->adap, &msg, 1) != 1)
 346                 return -EREMOTEIO;
 347
 348         return 0;
 349 }
 350
 351 static int
 352 va1j5jf8007s_check_ts_id(struct va1j5jf8007s_state *state, int *lock)
 353 {
 354         u8 addr;
 355         u8 write_buf[1], read_buf[2];
 356         struct i2c_msg msgs[2];
 357         u32 ts_id;
 358
 359         ts_id = state->fe.dtv_property_cache.isdbs_ts_id;
 360         if (!ts_id) {
 361                 *lock = 1;
 362                 return 0;
 363         }
 364
 365         addr = state->config->demod_address;
 366
 367         write_buf[0] = 0xe6;
 368
 369         msgs[0].addr = addr;
 370         msgs[0].flags = 0;
 371         msgs[0].len = sizeof(write_buf);
 372         msgs[0].buf = write_buf;
 373
 374         msgs[1].addr = addr;
 375         msgs[1].flags = I2C_M_RD;
 376         msgs[1].len = sizeof(read_buf);
 377         msgs[1].buf = read_buf;
 378
 379         if (i2c_transfer(state->adap, msgs, 2) != 2)
 380                 return -EREMOTEIO;
 381
 382         *lock = (read_buf[0] << 8 | read_buf[1]) == ts_id;
 383         return 0;
 384 }
 385
 386 static int
 387 va1j5jf8007s_tune(struct dvb_frontend *fe,
 388                   struct dvb_frontend_parameters *params,
 389                   unsigned int mode_flags,  unsigned int *delay,
 390                   fe_status_t *status)
 391 {
 392         struct va1j5jf8007s_state *state;
 393         int ret;
 394         int lock = 0;
 395
 396         state = fe->demodulator_priv;
 397
 398         if (params != NULL)
 399                 state->tune_state = VA1J5JF8007S_SET_FREQUENCY_1;
 400
 401         switch (state->tune_state) {
 402         case VA1J5JF8007S_IDLE:
 403                 *delay = 3 * HZ;
 404                 *status = 0;
 405                 return 0;
 406
 407         case VA1J5JF8007S_SET_FREQUENCY_1:
 408                 ret = va1j5jf8007s_set_frequency_1(state);
 409                 if (ret < 0)
 410                         return ret;
 411
 412                 state->tune_state = VA1J5JF8007S_SET_FREQUENCY_2;
 413                 *delay = 0;
 414                 *status = 0;
 415                 return 0;
 416
 417         case VA1J5JF8007S_SET_FREQUENCY_2:
 418                 ret = va1j5jf8007s_set_frequency_2(state);
 419                 if (ret < 0)
 420                         return ret;
 421
 422                 state->tune_state = VA1J5JF8007S_SET_FREQUENCY_3;
 423                 *delay = (HZ + 99) / 100;
 424                 *status = 0;
 425                 return 0;
 426
 427         case VA1J5JF8007S_SET_FREQUENCY_3:
 428                 ret = va1j5jf8007s_set_frequency_3(state);
 429                 if (ret < 0)
 430                         return ret;
 431
 432                 state->tune_state = VA1J5JF8007S_CHECK_FREQUENCY;
 433                 *delay = 0;
 434                 *status = 0;
 435                 return 0;
 436
 437         case VA1J5JF8007S_CHECK_FREQUENCY:
 438                 ret = va1j5jf8007s_check_frequency(state, &lock);
 439                 if (ret < 0)
 440                         return ret;
 441
 442                 if (!lock)  {
 443                         *delay = (HZ + 999) / 1000;
 444                         *status = 0;
 445                         return 0;
 446                 }
 447
 448                 state->tune_state = VA1J5JF8007S_SET_MODULATION;
 449                 *delay = 0;
 450                 *status = FE_HAS_SIGNAL;
 451                 return 0;
 452
 453         case VA1J5JF8007S_SET_MODULATION:
 454                 ret = va1j5jf8007s_set_modulation(state);
 455                 if (ret < 0)
 456                         return ret;
 457
 458                 state->tune_state = VA1J5JF8007S_CHECK_MODULATION;
 459                 *delay = 0;
 460                 *status = FE_HAS_SIGNAL;
 461                 return 0;
 462
 463         case VA1J5JF8007S_CHECK_MODULATION:
 464                 ret = va1j5jf8007s_check_modulation(state, &lock);
 465                 if (ret < 0)
 466                         return ret;
 467
 468                 if (!lock)  {
 469                         *delay = (HZ + 49) / 50;
 470                         *status = FE_HAS_SIGNAL;
 471                         return 0;
 472                 }
 473
 474                 state->tune_state = VA1J5JF8007S_SET_TS_ID;
 475                 *delay = 0;
 476                 *status = FE_HAS_SIGNAL | FE_HAS_CARRIER;
 477                 return 0;
 478
 479         case VA1J5JF8007S_SET_TS_ID:
 480                 ret = va1j5jf8007s_set_ts_id(state);
 481                 if (ret < 0)
 482                         return ret;
 483
 484                 state->tune_state = VA1J5JF8007S_CHECK_TS_ID;
 485                 return 0;
 486
 487         case VA1J5JF8007S_CHECK_TS_ID:
 488                 ret = va1j5jf8007s_check_ts_id(state, &lock);
 489                 if (ret < 0)
 490                         return ret;
 491
 492                 if (!lock)  {
 493                         *delay = (HZ + 99) / 100;
 494                         *status = FE_HAS_SIGNAL | FE_HAS_CARRIER;
 495                         return 0;
 496                 }
 497
 498                 state->tune_state = VA1J5JF8007S_TRACK;
 499                 /* fall through */
 500
 501         case VA1J5JF8007S_TRACK:
 502                 *delay = 3 * HZ;
 503                 *status = FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_LOCK;
 504                 return 0;
 505         }
 506
 507         BUG();
 508 }
 509
 510 static int va1j5jf8007s_init_frequency(struct va1j5jf8007s_state *state)
 511 {
 512         u8 buf[4];
 513         struct i2c_msg msg;
 514
 515         buf[0] = 0xfe;
 516         buf[1] = 0xc0;
 517         buf[2] = 0xf0;
 518         buf[3] = 0x04;
 519
 520         msg.addr = state->config->demod_address;
 521         msg.flags = 0;
 522         msg.len = sizeof(buf);
 523         msg.buf = buf;
 524
 525         if (i2c_transfer(state->adap, &msg, 1) != 1)
 526                 return -EREMOTEIO;
 527
 528         return 0;
 529 }
 530
 531 static int va1j5jf8007s_set_sleep(struct va1j5jf8007s_state *state, int sleep)
 532 {
 533         u8 buf[2];
 534         struct i2c_msg msg;
 535
 536         buf[0] = 0x17;
 537         buf[1] = sleep ? 0x01 : 0x00;
 538
 539         msg.addr = state->config->demod_address;
 540         msg.flags = 0;
 541         msg.len = sizeof(buf);
 542         msg.buf = buf;
 543
 544         if (i2c_transfer(state->adap, &msg, 1) != 1)
 545                 return -EREMOTEIO;
 546
 547         return 0;
 548 }
 549
 550 static int va1j5jf8007s_sleep(struct dvb_frontend *fe)
 551 {
 552         struct va1j5jf8007s_state *state;
 553         int ret;
 554
 555         state = fe->demodulator_priv;
 556
 557         ret = va1j5jf8007s_init_frequency(state);
 558         if (ret < 0)
 559                 return ret;
 560
 561         return va1j5jf8007s_set_sleep(state, 1);
 562 }
 563
 564 static int va1j5jf8007s_init(struct dvb_frontend *fe)
 565 {
 566         struct va1j5jf8007s_state *state;
 567
 568         state = fe->demodulator_priv;
 569         state->tune_state = VA1J5JF8007S_IDLE;
 570
 571         return va1j5jf8007s_set_sleep(state, 0);
 572 }
 573
 574 static void va1j5jf8007s_release(struct dvb_frontend *fe)
 575 {
 576         struct va1j5jf8007s_state *state;
 577         state = fe->demodulator_priv;
 578         kfree(state);
 579 }
 580
 581 static struct dvb_frontend_ops va1j5jf8007s_ops = {
 582         .info = {
 583                 .name = "VA1J5JF8007 ISDB-S",
 584                 .type = FE_QPSK,
 585                 .frequency_min = 950000,
 586                 .frequency_max = 2150000,
 587                 .frequency_stepsize = 1000,
 588                 .caps = FE_CAN_INVERSION_AUTO | FE_CAN_FEC_AUTO |
 589                         FE_CAN_QAM_AUTO | FE_CAN_TRANSMISSION_MODE_AUTO |
 590                         FE_CAN_GUARD_INTERVAL_AUTO | FE_CAN_HIERARCHY_AUTO,
 591         },
 592
 593         .read_snr = va1j5jf8007s_read_snr,
 594         .get_frontend_algo = va1j5jf8007s_get_frontend_algo,
 595         .read_status = va1j5jf8007s_read_status,
 596         .tune = va1j5jf8007s_tune,
 597         .sleep = va1j5jf8007s_sleep,
 598         .init = va1j5jf8007s_init,
 599         .release = va1j5jf8007s_release,
 600 };
 601
 602 static int va1j5jf8007s_prepare_1(struct va1j5jf8007s_state *state)
 603 {
 604         u8 addr;
 605         u8 write_buf[1], read_buf[1];
 606         struct i2c_msg msgs[2];
 607
 608         addr = state->config->demod_address;
 609
 610         write_buf[0] = 0x07;
 611
 612         msgs[0].addr = addr;
 613         msgs[0].flags = 0;
 614         msgs[0].len = sizeof(write_buf);
 615         msgs[0].buf = write_buf;
 616
 617         msgs[1].addr = addr;
 618         msgs[1].flags = I2C_M_RD;
 619         msgs[1].len = sizeof(read_buf);
 620         msgs[1].buf = read_buf;
 621
 622         if (i2c_transfer(state->adap, msgs, 2) != 2)
 623                 return -EREMOTEIO;
 624
 625         if (read_buf[0] != 0x41)
 626                 return -EIO;
 627
 628         return 0;
 629 }
 630
 631 static const u8 va1j5jf8007s_prepare_bufs[][2] = {
 632         {0x04, 0x02}, {0x0d, 0x55}, {0x11, 0x40}, {0x13, 0x80}, {0x17, 0x01},
 633         {0x1c, 0x0a}, {0x1d, 0xaa}, {0x1e, 0x20}, {0x1f, 0x88}, {0x51, 0xb0},
 634         {0x52, 0x89}, {0x53, 0xb3}, {0x5a, 0x2d}, {0x5b, 0xd3}, {0x85, 0x69},
 635         {0x87, 0x04}, {0x8e, 0x02}, {0xa3, 0xf7}, {0xa5, 0xc0},
 636 };
 637
 638 static int va1j5jf8007s_prepare_2(struct va1j5jf8007s_state *state)
 639 {
 640         u8 addr;
 641         u8 buf[2];
 642         struct i2c_msg msg;
 643         int i;
 644
 645         addr = state->config->demod_address;
 646
 647         msg.addr = addr;
 648         msg.flags = 0;
 649         msg.len = 2;
 650         msg.buf = buf;
 651         for (i = 0; i < ARRAY_SIZE(va1j5jf8007s_prepare_bufs); i++) {
 652                 memcpy(buf, va1j5jf8007s_prepare_bufs[i], sizeof(buf));
 653                 if (i2c_transfer(state->adap, &msg, 1) != 1)
 654                         return -EREMOTEIO;
 655         }
 656
 657         return 0;
 658 }
 659
 660 /* must be called after va1j5jf8007t_attach */
 661 int va1j5jf8007s_prepare(struct dvb_frontend *fe)
 662 {
 663         struct va1j5jf8007s_state *state;
 664         int ret;
 665
 666         state = fe->demodulator_priv;
 667
 668         ret = va1j5jf8007s_prepare_1(state);
 669         if (ret < 0)
 670                 return ret;
 671
 672         ret = va1j5jf8007s_prepare_2(state);
 673         if (ret < 0)
 674                 return ret;
 675
 676         return va1j5jf8007s_init_frequency(state);
 677 }
 678
 679 struct dvb_frontend *
 680 va1j5jf8007s_attach(const struct va1j5jf8007s_config *config,
 681                     struct i2c_adapter *adap)
 682 {
 683         struct va1j5jf8007s_state *state;
 684         struct dvb_frontend *fe;
 685         u8 buf[2];
 686         struct i2c_msg msg;
 687
 688         state = kzalloc(sizeof(struct va1j5jf8007s_state), GFP_KERNEL);
 689         if (!state)
 690                 return NULL;
 691
 692         state->config = config;
 693         state->adap = adap;
 694
 695         fe = &state->fe;
 696         memcpy(&fe->ops, &va1j5jf8007s_ops, sizeof(struct dvb_frontend_ops));
 697         fe->demodulator_priv = state;
 698
 699         buf[0] = 0x01;
 700         buf[1] = 0x80;
 701
 702         msg.addr = state->config->demod_address;
 703         msg.flags = 0;
 704         msg.len = sizeof(buf);
 705         msg.buf = buf;
 706
 707         if (i2c_transfer(state->adap, &msg, 1) != 1) {
 708                 kfree(state);
 709                 return NULL;
 710         }
 711
 712         return fe;
 713 }