drivers/media/dvb/frontends/s5h1409.c

   1 /*
   2     Samsung S5H1409 VSB/QAM demodulator driver
   3
   4     Copyright (C) 2006 Steven Toth <stoth@hauppauge.com>
   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     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19
  20 */
  21
  22 #include <linux/kernel.h>
  23 #include <linux/init.h>
  24 #include <linux/module.h>
  25 #include <linux/string.h>
  26 #include <linux/slab.h>
  27 #include <linux/delay.h>
  28 #include "dvb_frontend.h"
  29 #include "dvb-pll.h"
  30 #include "s5h1409.h"
  31
  32 struct s5h1409_state {
  33
  34         struct i2c_adapter* i2c;
  35
  36         /* configuration settings */
  37         const struct s5h1409_config* config;
  38
  39         struct dvb_frontend frontend;
  40
  41         /* previous uncorrected block counter */
  42         fe_modulation_t current_modulation;
  43
  44         u32 current_frequency;
  45
  46         u32 is_qam_locked;
  47         u32 qam_state;
  48 };
  49
  50 static int debug = 0;
  51 #define dprintk if (debug) printk
  52
  53 /* Register values to initialise the demod, this will set VSB by default */
  54 static struct init_tab {
  55         u8      reg;
  56         u16     data;
  57 } init_tab[] = {
  58         { 0x00, 0x0071, },
  59         { 0x01, 0x3213, },
  60         { 0x09, 0x0025, },
  61         { 0x1c, 0x001d, },
  62         { 0x1f, 0x002d, },
  63         { 0x20, 0x001d, },
  64         { 0x22, 0x0022, },
  65         { 0x23, 0x0020, },
  66         { 0x29, 0x110f, },
  67         { 0x2a, 0x10b4, },
  68         { 0x2b, 0x10ae, },
  69         { 0x2c, 0x0031, },
  70         { 0x31, 0x010d, },
  71         { 0x32, 0x0100, },
  72         { 0x44, 0x0510, },
  73         { 0x54, 0x0104, },
  74         { 0x58, 0x2222, },
  75         { 0x59, 0x1162, },
  76         { 0x5a, 0x3211, },
  77         { 0x5d, 0x0370, },
  78         { 0x5e, 0x0296, },
  79         { 0x61, 0x0010, },
  80         { 0x63, 0x4a00, },
  81         { 0x65, 0x0800, },
  82         { 0x71, 0x0003, },
  83         { 0x72, 0x0470, },
  84         { 0x81, 0x0002, },
  85         { 0x82, 0x0600, },
  86         { 0x86, 0x0002, },
  87         { 0x8a, 0x2c38, },
  88         { 0x8b, 0x2a37, },
  89         { 0x92, 0x302f, },
  90         { 0x93, 0x3332, },
  91         { 0x96, 0x000c, },
  92         { 0x99, 0x0101, },
  93         { 0x9c, 0x2e37, },
  94         { 0x9d, 0x2c37, },
  95         { 0x9e, 0x2c37, },
  96         { 0xab, 0x0100, },
  97         { 0xac, 0x1003, },
  98         { 0xad, 0x103f, },
  99         { 0xe2, 0x0100, },
 100         { 0xe3, 0x0000, },
 101         { 0x28, 0x1010, },
 102         { 0xb1, 0x000e, },
 103 };
 104
 105 /* VSB SNR lookup table */
 106 static struct vsb_snr_tab {
 107         u16     val;
 108         u16     data;
 109 } vsb_snr_tab[] = {
 110         {  924, 300, },
 111         {  923, 300, },
 112         {  918, 295, },
 113         {  915, 290, },
 114         {  911, 285, },
 115         {  906, 280, },
 116         {  901, 275, },
 117         {  896, 270, },
 118         {  891, 265, },
 119         {  885, 260, },
 120         {  879, 255, },
 121         {  873, 250, },
 122         {  864, 245, },
 123         {  858, 240, },
 124         {  850, 235, },
 125         {  841, 230, },
 126         {  832, 225, },
 127         {  823, 220, },
 128         {  812, 215, },
 129         {  802, 210, },
 130         {  788, 205, },
 131         {  778, 200, },
 132         {  767, 195, },
 133         {  753, 190, },
 134         {  740, 185, },
 135         {  725, 180, },
 136         {  707, 175, },
 137         {  689, 170, },
 138         {  671, 165, },
 139         {  656, 160, },
 140         {  637, 155, },
 141         {  616, 150, },
 142         {  542, 145, },
 143         {  519, 140, },
 144         {  507, 135, },
 145         {  497, 130, },
 146         {  492, 125, },
 147         {  474, 120, },
 148         {  300, 111, },
 149         {    0,   0, },
 150 };
 151
 152 /* QAM64 SNR lookup table */
 153 static struct qam64_snr_tab {
 154         u16     val;
 155         u16     data;
 156 } qam64_snr_tab[] = {
 157         {    1,   0, },
 158         {   12, 300, },
 159         {   15, 290, },
 160         {   18, 280, },
 161         {   22, 270, },
 162         {   23, 268, },
 163         {   24, 266, },
 164         {   25, 264, },
 165         {   27, 262, },
 166         {   28, 260, },
 167         {   29, 258, },
 168         {   30, 256, },
 169         {   32, 254, },
 170         {   33, 252, },
 171         {   34, 250, },
 172         {   35, 249, },
 173         {   36, 248, },
 174         {   37, 247, },
 175         {   38, 246, },
 176         {   39, 245, },
 177         {   40, 244, },
 178         {   41, 243, },
 179         {   42, 241, },
 180         {   43, 240, },
 181         {   44, 239, },
 182         {   45, 238, },
 183         {   46, 237, },
 184         {   47, 236, },
 185         {   48, 235, },
 186         {   49, 234, },
 187         {   50, 233, },
 188         {   51, 232, },
 189         {   52, 231, },
 190         {   53, 230, },
 191         {   55, 229, },
 192         {   56, 228, },
 193         {   57, 227, },
 194         {   58, 226, },
 195         {   59, 225, },
 196         {   60, 224, },
 197         {   62, 223, },
 198         {   63, 222, },
 199         {   65, 221, },
 200         {   66, 220, },
 201         {   68, 219, },
 202         {   69, 218, },
 203         {   70, 217, },
 204         {   72, 216, },
 205         {   73, 215, },
 206         {   75, 214, },
 207         {   76, 213, },
 208         {   78, 212, },
 209         {   80, 211, },
 210         {   81, 210, },
 211         {   83, 209, },
 212         {   84, 208, },
 213         {   85, 207, },
 214         {   87, 206, },
 215         {   89, 205, },
 216         {   91, 204, },
 217         {   93, 203, },
 218         {   95, 202, },
 219         {   96, 201, },
 220         {  104, 200, },
 221         {  255,   0, },
 222 };
 223
 224 /* QAM256 SNR lookup table */
 225 static struct qam256_snr_tab {
 226         u16     val;
 227         u16     data;
 228 } qam256_snr_tab[] = {
 229         {    1,   0, },
 230         {   12, 400, },
 231         {   13, 390, },
 232         {   15, 380, },
 233         {   17, 360, },
 234         {   19, 350, },
 235         {   22, 348, },
 236         {   23, 346, },
 237         {   24, 344, },
 238         {   25, 342, },
 239         {   26, 340, },
 240         {   27, 336, },
 241         {   28, 334, },
 242         {   29, 332, },
 243         {   30, 330, },
 244         {   31, 328, },
 245         {   32, 326, },
 246         {   33, 325, },
 247         {   34, 322, },
 248         {   35, 320, },
 249         {   37, 318, },
 250         {   39, 316, },
 251         {   40, 314, },
 252         {   41, 312, },
 253         {   42, 310, },
 254         {   43, 308, },
 255         {   46, 306, },
 256         {   47, 304, },
 257         {   49, 302, },
 258         {   51, 300, },
 259         {   53, 298, },
 260         {   54, 297, },
 261         {   55, 296, },
 262         {   56, 295, },
 263         {   57, 294, },
 264         {   59, 293, },
 265         {   60, 292, },
 266         {   61, 291, },
 267         {   63, 290, },
 268         {   64, 289, },
 269         {   65, 288, },
 270         {   66, 287, },
 271         {   68, 286, },
 272         {   69, 285, },
 273         {   71, 284, },
 274         {   72, 283, },
 275         {   74, 282, },
 276         {   75, 281, },
 277         {   76, 280, },
 278         {   77, 279, },
 279         {   78, 278, },
 280         {   81, 277, },
 281         {   83, 276, },
 282         {   84, 275, },
 283         {   86, 274, },
 284         {   87, 273, },
 285         {   89, 272, },
 286         {   90, 271, },
 287         {   92, 270, },
 288         {   93, 269, },
 289         {   95, 268, },
 290         {   96, 267, },
 291         {   98, 266, },
 292         {  100, 265, },
 293         {  102, 264, },
 294         {  104, 263, },
 295         {  105, 262, },
 296         {  106, 261, },
 297         {  110, 260, },
 298         {  255,   0, },
 299 };
 300
 301 /* 8 bit registers, 16 bit values */
 302 static int s5h1409_writereg(struct s5h1409_state* state, u8 reg, u16 data)
 303 {
 304         int ret;
 305         u8 buf [] = { reg, data >> 8,  data & 0xff };
 306
 307         struct i2c_msg msg = { .addr = state->config->demod_address,
 308                                .flags = 0, .buf = buf, .len = 3 };
 309
 310         ret = i2c_transfer(state->i2c, &msg, 1);
 311
 312         if (ret != 1)
 313                 printk("%s: writereg error (reg == 0x%02x, val == 0x%04x, "
 314                        "ret == %i)\n", __FUNCTION__, reg, data, ret);
 315
 316         return (ret != 1) ? -1 : 0;
 317 }
 318
 319 static u16 s5h1409_readreg(struct s5h1409_state* state, u8 reg)
 320 {
 321         int ret;
 322         u8 b0 [] = { reg };
 323         u8 b1 [] = { 0, 0 };
 324
 325         struct i2c_msg msg [] = {
 326                 { .addr = state->config->demod_address, .flags = 0,
 327                   .buf = b0, .len = 1 },
 328                 { .addr = state->config->demod_address, .flags = I2C_M_RD,
 329                   .buf = b1, .len = 2 } };
 330
 331         ret = i2c_transfer(state->i2c, msg, 2);
 332
 333         if (ret != 2)
 334                 printk("%s: readreg error (ret == %i)\n", __FUNCTION__, ret);
 335         return (b1[0] << 8) | b1[1];
 336 }
 337
 338 static int s5h1409_softreset(struct dvb_frontend* fe)
 339 {
 340         struct s5h1409_state* state = fe->demodulator_priv;
 341
 342         dprintk("%s()\n", __FUNCTION__);
 343
 344         s5h1409_writereg(state, 0xf5, 0);
 345         s5h1409_writereg(state, 0xf5, 1);
 346         state->is_qam_locked = 0;
 347         state->qam_state = 0;
 348         return 0;
 349 }
 350
 351 static int s5h1409_set_if_freq(struct dvb_frontend* fe, int KHz)
 352 {
 353         struct s5h1409_state* state = fe->demodulator_priv;
 354         int ret = 0;
 355
 356         dprintk("%s(%d KHz)\n", __FUNCTION__, KHz);
 357
 358         if( (KHz == 44000) || (KHz == 5380) ) {
 359                 s5h1409_writereg(state, 0x87, 0x01be);
 360                 s5h1409_writereg(state, 0x88, 0x0436);
 361                 s5h1409_writereg(state, 0x89, 0x054d);
 362         } else
 363         if (KHz == 4000) {
 364                 s5h1409_writereg(state, 0x87, 0x014b);
 365                 s5h1409_writereg(state, 0x88, 0x0cb5);
 366                 s5h1409_writereg(state, 0x89, 0x03e2);
 367         } else {
 368                 printk("%s() Invalid arg = %d KHz\n", __FUNCTION__, KHz);
 369                 ret = -1;
 370         }
 371
 372         return ret;
 373 }
 374
 375 static int s5h1409_set_spectralinversion(struct dvb_frontend* fe, int inverted)
 376 {
 377         struct s5h1409_state* state = fe->demodulator_priv;
 378
 379         dprintk("%s(%d)\n", __FUNCTION__, inverted);
 380
 381         if(inverted == 1)
 382                 return s5h1409_writereg(state, 0x1b, 0x1101); /* Inverted */
 383         else
 384                 return s5h1409_writereg(state, 0x1b, 0x0110); /* Normal */
 385 }
 386
 387 static int s5h1409_enable_modulation(struct dvb_frontend* fe,
 388                                      fe_modulation_t m)
 389 {
 390         struct s5h1409_state* state = fe->demodulator_priv;
 391
 392         dprintk("%s(0x%08x)\n", __FUNCTION__, m);
 393
 394         switch(m) {
 395         case VSB_8:
 396                 dprintk("%s() VSB_8\n", __FUNCTION__);
 397                 s5h1409_writereg(state, 0xf4, 0);
 398                 break;
 399         case QAM_64:
 400         case QAM_256:
 401                 dprintk("%s() QAM_AUTO (64/256)\n", __FUNCTION__);
 402                 s5h1409_writereg(state, 0xf4, 1);
 403                 s5h1409_writereg(state, 0x85, 0x110);
 404                 break;
 405         default:
 406                 dprintk("%s() Invalid modulation\n", __FUNCTION__);
 407                 return -EINVAL;
 408         }
 409
 410         state->current_modulation = m;
 411         s5h1409_softreset(fe);
 412
 413         return 0;
 414 }
 415
 416 static int s5h1409_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
 417 {
 418         struct s5h1409_state* state = fe->demodulator_priv;
 419
 420         dprintk("%s(%d)\n", __FUNCTION__, enable);
 421
 422         if (enable)
 423                 return s5h1409_writereg(state, 0xf3, 1);
 424         else
 425                 return s5h1409_writereg(state, 0xf3, 0);
 426 }
 427
 428 static int s5h1409_set_gpio(struct dvb_frontend* fe, int enable)
 429 {
 430         struct s5h1409_state* state = fe->demodulator_priv;
 431
 432         dprintk("%s(%d)\n", __FUNCTION__, enable);
 433
 434         if (enable)
 435                 return s5h1409_writereg(state, 0xe3, 0x1100);
 436         else
 437                 return s5h1409_writereg(state, 0xe3, 0x1000);
 438 }
 439
 440 static int s5h1409_sleep(struct dvb_frontend* fe, int enable)
 441 {
 442         struct s5h1409_state* state = fe->demodulator_priv;
 443
 444         dprintk("%s(%d)\n", __FUNCTION__, enable);
 445
 446         return s5h1409_writereg(state, 0xf2, enable);
 447 }
 448
 449 static int s5h1409_register_reset(struct dvb_frontend* fe)
 450 {
 451         struct s5h1409_state* state = fe->demodulator_priv;
 452
 453         dprintk("%s()\n", __FUNCTION__);
 454
 455         return s5h1409_writereg(state, 0xfa, 0);
 456 }
 457
 458 static void s5h1409_set_qam_amhum_mode(struct dvb_frontend *fe)
 459 {
 460         struct s5h1409_state *state = fe->demodulator_priv;
 461         u16 reg;
 462
 463         if (state->is_qam_locked)
 464                 return;
 465
 466         /* QAM EQ lock check */
 467         reg = s5h1409_readreg(state, 0xf0);
 468
 469         if ((reg >> 13) & 0x1) {
 470
 471                 state->is_qam_locked = 1;
 472                 reg &= 0xff;
 473
 474                 s5h1409_writereg(state, 0x96, 0x00c);
 475                 if ((reg < 0x38) || (reg > 0x68) ) {
 476                         s5h1409_writereg(state, 0x93, 0x3332);
 477                         s5h1409_writereg(state, 0x9e, 0x2c37);
 478                 } else {
 479                         s5h1409_writereg(state, 0x93, 0x3130);
 480                         s5h1409_writereg(state, 0x9e, 0x2836);
 481                 }
 482
 483         } else {
 484                 s5h1409_writereg(state, 0x96, 0x0008);
 485                 s5h1409_writereg(state, 0x93, 0x3332);
 486                 s5h1409_writereg(state, 0x9e, 0x2c37);
 487         }
 488 }
 489
 490 static void s5h1409_set_qam_interleave_mode(struct dvb_frontend *fe)
 491 {
 492         struct s5h1409_state *state = fe->demodulator_priv;
 493         u16 reg, reg1, reg2;
 494
 495         reg = s5h1409_readreg(state, 0xf1);
 496
 497         /* Master lock */
 498         if ((reg >> 15) & 0x1) {
 499                 if (state->qam_state != 2) {
 500                         state->qam_state = 2;
 501                         reg1 = s5h1409_readreg(state, 0xb2);
 502                         reg2 = s5h1409_readreg(state, 0xad);
 503
 504                         s5h1409_writereg(state, 0x96, 0x20);
 505                         s5h1409_writereg(state, 0xad,
 506                                 ( ((reg1 & 0xf000) >> 4) | (reg2 & 0xf0ff)) );
 507                         s5h1409_writereg(state, 0xab, 0x1100);
 508                 }
 509         } else {
 510                 if (state->qam_state != 1) {
 511                         state->qam_state = 1;
 512                         s5h1409_writereg(state, 0x96, 0x08);
 513                         s5h1409_writereg(state, 0xab, 0x1101);
 514                 }
 515         }
 516 }
 517
 518 /* Talk to the demod, set the FEC, GUARD, QAM settings etc */
 519 static int s5h1409_set_frontend (struct dvb_frontend* fe,
 520                                  struct dvb_frontend_parameters *p)
 521 {
 522         struct s5h1409_state* state = fe->demodulator_priv;
 523
 524         dprintk("%s(frequency=%d)\n", __FUNCTION__, p->frequency);
 525
 526         s5h1409_softreset(fe);
 527
 528         state->current_frequency = p->frequency;
 529
 530         s5h1409_enable_modulation(fe, p->u.vsb.modulation);
 531
 532         /* Allow the demod to settle */
 533         msleep(100);
 534
 535         if (fe->ops.tuner_ops.set_params) {
 536                 if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 1);
 537                 fe->ops.tuner_ops.set_params(fe, p);
 538                 if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
 539         }
 540
 541         /* Optimize the demod for QAM */
 542         if (p->u.vsb.modulation != VSB_8) {
 543                 s5h1409_set_qam_amhum_mode(fe);
 544                 s5h1409_set_qam_interleave_mode(fe);
 545         }
 546
 547         return 0;
 548 }
 549
 550 /* Reset the demod hardware and reset all of the configuration registers
 551    to a default state. */
 552 static int s5h1409_init (struct dvb_frontend* fe)
 553 {
 554         int i;
 555
 556         struct s5h1409_state* state = fe->demodulator_priv;
 557         dprintk("%s()\n", __FUNCTION__);
 558
 559         s5h1409_sleep(fe, 0);
 560         s5h1409_register_reset(fe);
 561
 562         for (i=0; i < ARRAY_SIZE(init_tab); i++)
 563                 s5h1409_writereg(state, init_tab[i].reg, init_tab[i].data);
 564
 565         /* The datasheet says that after initialisation, VSB is default */
 566         state->current_modulation = VSB_8;
 567
 568         if (state->config->output_mode == S5H1409_SERIAL_OUTPUT)
 569                 s5h1409_writereg(state, 0xab, 0x100); /* Serial */
 570         else
 571                 s5h1409_writereg(state, 0xab, 0x0); /* Parallel */
 572
 573         s5h1409_set_spectralinversion(fe, state->config->inversion);
 574         s5h1409_set_if_freq(fe, state->config->if_freq);
 575         s5h1409_set_gpio(fe, state->config->gpio);
 576         s5h1409_softreset(fe);
 577
 578         /* Note: Leaving the I2C gate closed. */
 579         s5h1409_i2c_gate_ctrl(fe, 0);
 580
 581         return 0;
 582 }
 583
 584 static int s5h1409_read_status(struct dvb_frontend* fe, fe_status_t* status)
 585 {
 586         struct s5h1409_state* state = fe->demodulator_priv;
 587         u16 reg;
 588         u32 tuner_status = 0;
 589
 590         *status = 0;
 591
 592         /* Get the demodulator status */
 593         reg = s5h1409_readreg(state, 0xf1);
 594         if(reg & 0x1000)
 595                 *status |= FE_HAS_VITERBI;
 596         if(reg & 0x8000)
 597                 *status |= FE_HAS_LOCK | FE_HAS_SYNC;
 598
 599         switch(state->config->status_mode) {
 600         case S5H1409_DEMODLOCKING:
 601                 if (*status & FE_HAS_VITERBI)
 602                         *status |= FE_HAS_CARRIER | FE_HAS_SIGNAL;
 603                 break;
 604         case S5H1409_TUNERLOCKING:
 605                 /* Get the tuner status */
 606                 if (fe->ops.tuner_ops.get_status) {
 607                         if (fe->ops.i2c_gate_ctrl)
 608                                 fe->ops.i2c_gate_ctrl(fe, 1);
 609
 610                         fe->ops.tuner_ops.get_status(fe, &tuner_status);
 611
 612                         if (fe->ops.i2c_gate_ctrl)
 613                                 fe->ops.i2c_gate_ctrl(fe, 0);
 614                 }
 615                 if (tuner_status)
 616                         *status |= FE_HAS_CARRIER | FE_HAS_SIGNAL;
 617                 break;
 618         }
 619
 620         dprintk("%s() status 0x%08x\n", __FUNCTION__, *status);
 621
 622         return 0;
 623 }
 624
 625 static int s5h1409_qam256_lookup_snr(struct dvb_frontend* fe, u16* snr, u16 v)
 626 {
 627         int i, ret = -EINVAL;
 628         dprintk("%s()\n", __FUNCTION__);
 629
 630         for (i=0; i < ARRAY_SIZE(qam256_snr_tab); i++) {
 631                 if (v < qam256_snr_tab[i].val) {
 632                         *snr = qam256_snr_tab[i].data;
 633                         ret = 0;
 634                         break;
 635                 }
 636         }
 637         return ret;
 638 }
 639
 640 static int s5h1409_qam64_lookup_snr(struct dvb_frontend* fe, u16* snr, u16 v)
 641 {
 642         int i, ret = -EINVAL;
 643         dprintk("%s()\n", __FUNCTION__);
 644
 645         for (i=0; i < ARRAY_SIZE(qam64_snr_tab); i++) {
 646                 if (v < qam64_snr_tab[i].val) {
 647                         *snr = qam64_snr_tab[i].data;
 648                         ret = 0;
 649                         break;
 650                 }
 651         }
 652         return ret;
 653 }
 654
 655 static int s5h1409_vsb_lookup_snr(struct dvb_frontend* fe, u16* snr, u16 v)
 656 {
 657         int i, ret = -EINVAL;
 658         dprintk("%s()\n", __FUNCTION__);
 659
 660         for (i=0; i < ARRAY_SIZE(vsb_snr_tab); i++) {
 661                 if (v > vsb_snr_tab[i].val) {
 662                         *snr = vsb_snr_tab[i].data;
 663                         ret = 0;
 664                         break;
 665                 }
 666         }
 667         dprintk("%s() snr=%d\n", __FUNCTION__, *snr);
 668         return ret;
 669 }
 670
 671 static int s5h1409_read_snr(struct dvb_frontend* fe, u16* snr)
 672 {
 673         struct s5h1409_state* state = fe->demodulator_priv;
 674         u16 reg;
 675         dprintk("%s()\n", __FUNCTION__);
 676
 677         switch(state->current_modulation) {
 678         case QAM_64:
 679                 reg = s5h1409_readreg(state, 0xf0) & 0xff;
 680                 return s5h1409_qam64_lookup_snr(fe, snr, reg);
 681         case QAM_256:
 682                 reg = s5h1409_readreg(state, 0xf0) & 0xff;
 683                 return s5h1409_qam256_lookup_snr(fe, snr, reg);
 684         case VSB_8:
 685                 reg = s5h1409_readreg(state, 0xf1) & 0x3ff;
 686                 return s5h1409_vsb_lookup_snr(fe, snr, reg);
 687         default:
 688                 break;
 689         }
 690
 691         return -EINVAL;
 692 }
 693
 694 static int s5h1409_read_signal_strength(struct dvb_frontend* fe,
 695                                         u16* signal_strength)
 696 {
 697         return s5h1409_read_snr(fe, signal_strength);
 698 }
 699
 700 static int s5h1409_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
 701 {
 702         struct s5h1409_state* state = fe->demodulator_priv;
 703
 704         *ucblocks = s5h1409_readreg(state, 0xb5);
 705
 706         return 0;
 707 }
 708
 709 static int s5h1409_read_ber(struct dvb_frontend* fe, u32* ber)
 710 {
 711         return s5h1409_read_ucblocks(fe, ber);
 712 }
 713
 714 static int s5h1409_get_frontend(struct dvb_frontend* fe,
 715                                 struct dvb_frontend_parameters *p)
 716 {
 717         struct s5h1409_state* state = fe->demodulator_priv;
 718
 719         p->frequency = state->current_frequency;
 720         p->u.vsb.modulation = state->current_modulation;
 721
 722         return 0;
 723 }
 724
 725 static int s5h1409_get_tune_settings(struct dvb_frontend* fe,
 726                                      struct dvb_frontend_tune_settings *tune)
 727 {
 728         tune->min_delay_ms = 1000;
 729         return 0;
 730 }
 731
 732 static void s5h1409_release(struct dvb_frontend* fe)
 733 {
 734         struct s5h1409_state* state = fe->demodulator_priv;
 735         kfree(state);
 736 }
 737
 738 static struct dvb_frontend_ops s5h1409_ops;
 739
 740 struct dvb_frontend* s5h1409_attach(const struct s5h1409_config* config,
 741                                     struct i2c_adapter* i2c)
 742 {
 743         struct s5h1409_state* state = NULL;
 744
 745         /* allocate memory for the internal state */
 746         state = kmalloc(sizeof(struct s5h1409_state), GFP_KERNEL);
 747         if (state == NULL)
 748                 goto error;
 749
 750         /* setup the state */
 751         state->config = config;
 752         state->i2c = i2c;
 753         state->current_modulation = 0;
 754
 755         /* check if the demod exists */
 756         if (s5h1409_readreg(state, 0x04) != 0x0066)
 757                 goto error;
 758
 759         /* create dvb_frontend */
 760         memcpy(&state->frontend.ops, &s5h1409_ops,
 761                sizeof(struct dvb_frontend_ops));
 762         state->frontend.demodulator_priv = state;
 763
 764         /* Note: Leaving the I2C gate open here. */
 765         s5h1409_writereg(state, 0xf3, 1);
 766
 767         return &state->frontend;
 768
 769 error:
 770         kfree(state);
 771         return NULL;
 772 }
 773
 774 static struct dvb_frontend_ops s5h1409_ops = {
 775
 776         .info = {
 777                 .name                   = "Samsung S5H1409 QAM/8VSB Frontend",
 778                 .type                   = FE_ATSC,
 779                 .frequency_min          = 54000000,
 780                 .frequency_max          = 858000000,
 781                 .frequency_stepsize     = 62500,
 782                 .caps = FE_CAN_QAM_64 | FE_CAN_QAM_256 | FE_CAN_8VSB
 783         },
 784
 785         .init                 = s5h1409_init,
 786         .i2c_gate_ctrl        = s5h1409_i2c_gate_ctrl,
 787         .set_frontend         = s5h1409_set_frontend,
 788         .get_frontend         = s5h1409_get_frontend,
 789         .get_tune_settings    = s5h1409_get_tune_settings,
 790         .read_status          = s5h1409_read_status,
 791         .read_ber             = s5h1409_read_ber,
 792         .read_signal_strength = s5h1409_read_signal_strength,
 793         .read_snr             = s5h1409_read_snr,
 794         .read_ucblocks        = s5h1409_read_ucblocks,
 795         .release              = s5h1409_release,
 796 };
 797
 798 module_param(debug, int, 0644);
 799 MODULE_PARM_DESC(debug, "Enable verbose debug messages");
 800
 801 MODULE_DESCRIPTION("Samsung S5H1409 QAM-B/ATSC Demodulator driver");
 802 MODULE_AUTHOR("Steven Toth");
 803 MODULE_LICENSE("GPL");
 804
 805 EXPORT_SYMBOL(s5h1409_attach);
 806
 807 /*
 808  * Local variables:
 809  * c-basic-offset: 8
 810  */