drivers/media/dvb-frontends/s5h1409.c

   1 /*
   2     Samsung S5H1409 VSB/QAM demodulator driver
   3
   4     Copyright (C) 2006 Steven Toth <stoth@linuxtv.org>
   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 <media/dvb_frontend.h>
  29 #include "s5h1409.h"
  30
  31 struct s5h1409_state {
  32
  33         struct i2c_adapter *i2c;
  34
  35         /* configuration settings */
  36         const struct s5h1409_config *config;
  37
  38         struct dvb_frontend frontend;
  39
  40         /* previous uncorrected block counter */
  41         enum fe_modulation current_modulation;
  42
  43         u32 current_frequency;
  44         int if_freq;
  45
  46         u32 is_qam_locked;
  47
  48         /* QAM tuning state goes through the following state transitions */
  49 #define QAM_STATE_UNTUNED 0
  50 #define QAM_STATE_TUNING_STARTED 1
  51 #define QAM_STATE_INTERLEAVE_SET 2
  52 #define QAM_STATE_QAM_OPTIMIZED_L1 3
  53 #define QAM_STATE_QAM_OPTIMIZED_L2 4
  54 #define QAM_STATE_QAM_OPTIMIZED_L3 5
  55         u8  qam_state;
  56 };
  57
  58 static int debug;
  59 module_param(debug, int, 0644);
  60 MODULE_PARM_DESC(debug, "Enable verbose debug messages");
  61
  62 #define dprintk if (debug) printk
  63
  64 /* Register values to initialise the demod, this will set VSB by default */
  65 static struct init_tab {
  66         u8      reg;
  67         u16     data;
  68 } init_tab[] = {
  69         { 0x00, 0x0071, },
  70         { 0x01, 0x3213, },
  71         { 0x09, 0x0025, },
  72         { 0x1c, 0x001d, },
  73         { 0x1f, 0x002d, },
  74         { 0x20, 0x001d, },
  75         { 0x22, 0x0022, },
  76         { 0x23, 0x0020, },
  77         { 0x29, 0x110f, },
  78         { 0x2a, 0x10b4, },
  79         { 0x2b, 0x10ae, },
  80         { 0x2c, 0x0031, },
  81         { 0x31, 0x010d, },
  82         { 0x32, 0x0100, },
  83         { 0x44, 0x0510, },
  84         { 0x54, 0x0104, },
  85         { 0x58, 0x2222, },
  86         { 0x59, 0x1162, },
  87         { 0x5a, 0x3211, },
  88         { 0x5d, 0x0370, },
  89         { 0x5e, 0x0296, },
  90         { 0x61, 0x0010, },
  91         { 0x63, 0x4a00, },
  92         { 0x65, 0x0800, },
  93         { 0x71, 0x0003, },
  94         { 0x72, 0x0470, },
  95         { 0x81, 0x0002, },
  96         { 0x82, 0x0600, },
  97         { 0x86, 0x0002, },
  98         { 0x8a, 0x2c38, },
  99         { 0x8b, 0x2a37, },
 100         { 0x92, 0x302f, },
 101         { 0x93, 0x3332, },
 102         { 0x96, 0x000c, },
 103         { 0x99, 0x0101, },
 104         { 0x9c, 0x2e37, },
 105         { 0x9d, 0x2c37, },
 106         { 0x9e, 0x2c37, },
 107         { 0xab, 0x0100, },
 108         { 0xac, 0x1003, },
 109         { 0xad, 0x103f, },
 110         { 0xe2, 0x0100, },
 111         { 0xe3, 0x1000, },
 112         { 0x28, 0x1010, },
 113         { 0xb1, 0x000e, },
 114 };
 115
 116 /* VSB SNR lookup table */
 117 static struct vsb_snr_tab {
 118         u16     val;
 119         u16     data;
 120 } vsb_snr_tab[] = {
 121         {  924, 300, },
 122         {  923, 300, },
 123         {  918, 295, },
 124         {  915, 290, },
 125         {  911, 285, },
 126         {  906, 280, },
 127         {  901, 275, },
 128         {  896, 270, },
 129         {  891, 265, },
 130         {  885, 260, },
 131         {  879, 255, },
 132         {  873, 250, },
 133         {  864, 245, },
 134         {  858, 240, },
 135         {  850, 235, },
 136         {  841, 230, },
 137         {  832, 225, },
 138         {  823, 220, },
 139         {  812, 215, },
 140         {  802, 210, },
 141         {  788, 205, },
 142         {  778, 200, },
 143         {  767, 195, },
 144         {  753, 190, },
 145         {  740, 185, },
 146         {  725, 180, },
 147         {  707, 175, },
 148         {  689, 170, },
 149         {  671, 165, },
 150         {  656, 160, },
 151         {  637, 155, },
 152         {  616, 150, },
 153         {  542, 145, },
 154         {  519, 140, },
 155         {  507, 135, },
 156         {  497, 130, },
 157         {  492, 125, },
 158         {  474, 120, },
 159         {  300, 111, },
 160         {    0,   0, },
 161 };
 162
 163 /* QAM64 SNR lookup table */
 164 static struct qam64_snr_tab {
 165         u16     val;
 166         u16     data;
 167 } qam64_snr_tab[] = {
 168         {    1,   0, },
 169         {   12, 300, },
 170         {   15, 290, },
 171         {   18, 280, },
 172         {   22, 270, },
 173         {   23, 268, },
 174         {   24, 266, },
 175         {   25, 264, },
 176         {   27, 262, },
 177         {   28, 260, },
 178         {   29, 258, },
 179         {   30, 256, },
 180         {   32, 254, },
 181         {   33, 252, },
 182         {   34, 250, },
 183         {   35, 249, },
 184         {   36, 248, },
 185         {   37, 247, },
 186         {   38, 246, },
 187         {   39, 245, },
 188         {   40, 244, },
 189         {   41, 243, },
 190         {   42, 241, },
 191         {   43, 240, },
 192         {   44, 239, },
 193         {   45, 238, },
 194         {   46, 237, },
 195         {   47, 236, },
 196         {   48, 235, },
 197         {   49, 234, },
 198         {   50, 233, },
 199         {   51, 232, },
 200         {   52, 231, },
 201         {   53, 230, },
 202         {   55, 229, },
 203         {   56, 228, },
 204         {   57, 227, },
 205         {   58, 226, },
 206         {   59, 225, },
 207         {   60, 224, },
 208         {   62, 223, },
 209         {   63, 222, },
 210         {   65, 221, },
 211         {   66, 220, },
 212         {   68, 219, },
 213         {   69, 218, },
 214         {   70, 217, },
 215         {   72, 216, },
 216         {   73, 215, },
 217         {   75, 214, },
 218         {   76, 213, },
 219         {   78, 212, },
 220         {   80, 211, },
 221         {   81, 210, },
 222         {   83, 209, },
 223         {   84, 208, },
 224         {   85, 207, },
 225         {   87, 206, },
 226         {   89, 205, },
 227         {   91, 204, },
 228         {   93, 203, },
 229         {   95, 202, },
 230         {   96, 201, },
 231         {  104, 200, },
 232         {  255,   0, },
 233 };
 234
 235 /* QAM256 SNR lookup table */
 236 static struct qam256_snr_tab {
 237         u16     val;
 238         u16     data;
 239 } qam256_snr_tab[] = {
 240         {    1,   0, },
 241         {   12, 400, },
 242         {   13, 390, },
 243         {   15, 380, },
 244         {   17, 360, },
 245         {   19, 350, },
 246         {   22, 348, },
 247         {   23, 346, },
 248         {   24, 344, },
 249         {   25, 342, },
 250         {   26, 340, },
 251         {   27, 336, },
 252         {   28, 334, },
 253         {   29, 332, },
 254         {   30, 330, },
 255         {   31, 328, },
 256         {   32, 326, },
 257         {   33, 325, },
 258         {   34, 322, },
 259         {   35, 320, },
 260         {   37, 318, },
 261         {   39, 316, },
 262         {   40, 314, },
 263         {   41, 312, },
 264         {   42, 310, },
 265         {   43, 308, },
 266         {   46, 306, },
 267         {   47, 304, },
 268         {   49, 302, },
 269         {   51, 300, },
 270         {   53, 298, },
 271         {   54, 297, },
 272         {   55, 296, },
 273         {   56, 295, },
 274         {   57, 294, },
 275         {   59, 293, },
 276         {   60, 292, },
 277         {   61, 291, },
 278         {   63, 290, },
 279         {   64, 289, },
 280         {   65, 288, },
 281         {   66, 287, },
 282         {   68, 286, },
 283         {   69, 285, },
 284         {   71, 284, },
 285         {   72, 283, },
 286         {   74, 282, },
 287         {   75, 281, },
 288         {   76, 280, },
 289         {   77, 279, },
 290         {   78, 278, },
 291         {   81, 277, },
 292         {   83, 276, },
 293         {   84, 275, },
 294         {   86, 274, },
 295         {   87, 273, },
 296         {   89, 272, },
 297         {   90, 271, },
 298         {   92, 270, },
 299         {   93, 269, },
 300         {   95, 268, },
 301         {   96, 267, },
 302         {   98, 266, },
 303         {  100, 265, },
 304         {  102, 264, },
 305         {  104, 263, },
 306         {  105, 262, },
 307         {  106, 261, },
 308         {  110, 260, },
 309         {  255,   0, },
 310 };
 311
 312 /* 8 bit registers, 16 bit values */
 313 static int s5h1409_writereg(struct s5h1409_state *state, u8 reg, u16 data)
 314 {
 315         int ret;
 316         u8 buf[] = { reg, data >> 8,  data & 0xff };
 317
 318         struct i2c_msg msg = { .addr = state->config->demod_address,
 319                                .flags = 0, .buf = buf, .len = 3 };
 320
 321         ret = i2c_transfer(state->i2c, &msg, 1);
 322
 323         if (ret != 1)
 324                 printk(KERN_ERR "%s: error (reg == 0x%02x, val == 0x%04x, ret == %i)\n",
 325                        __func__, reg, data, ret);
 326
 327         return (ret != 1) ? -1 : 0;
 328 }
 329
 330 static u16 s5h1409_readreg(struct s5h1409_state *state, u8 reg)
 331 {
 332         int ret;
 333         u8 b0[] = { reg };
 334         u8 b1[] = { 0, 0 };
 335
 336         struct i2c_msg msg[] = {
 337                 { .addr = state->config->demod_address, .flags = 0,
 338                   .buf = b0, .len = 1 },
 339                 { .addr = state->config->demod_address, .flags = I2C_M_RD,
 340                   .buf = b1, .len = 2 } };
 341
 342         ret = i2c_transfer(state->i2c, msg, 2);
 343
 344         if (ret != 2)
 345                 printk("%s: readreg error (ret == %i)\n", __func__, ret);
 346         return (b1[0] << 8) | b1[1];
 347 }
 348
 349 static int s5h1409_softreset(struct dvb_frontend *fe)
 350 {
 351         struct s5h1409_state *state = fe->demodulator_priv;
 352
 353         dprintk("%s()\n", __func__);
 354
 355         s5h1409_writereg(state, 0xf5, 0);
 356         s5h1409_writereg(state, 0xf5, 1);
 357         state->is_qam_locked = 0;
 358         state->qam_state = QAM_STATE_UNTUNED;
 359         return 0;
 360 }
 361
 362 #define S5H1409_VSB_IF_FREQ 5380
 363 #define S5H1409_QAM_IF_FREQ (state->config->qam_if)
 364
 365 static int s5h1409_set_if_freq(struct dvb_frontend *fe, int KHz)
 366 {
 367         struct s5h1409_state *state = fe->demodulator_priv;
 368
 369         dprintk("%s(%d KHz)\n", __func__, KHz);
 370
 371         switch (KHz) {
 372         case 4000:
 373                 s5h1409_writereg(state, 0x87, 0x014b);
 374                 s5h1409_writereg(state, 0x88, 0x0cb5);
 375                 s5h1409_writereg(state, 0x89, 0x03e2);
 376                 break;
 377         case 5380:
 378         case 44000:
 379         default:
 380                 s5h1409_writereg(state, 0x87, 0x01be);
 381                 s5h1409_writereg(state, 0x88, 0x0436);
 382                 s5h1409_writereg(state, 0x89, 0x054d);
 383                 break;
 384         }
 385         state->if_freq = KHz;
 386
 387         return 0;
 388 }
 389
 390 static int s5h1409_set_spectralinversion(struct dvb_frontend *fe, int inverted)
 391 {
 392         struct s5h1409_state *state = fe->demodulator_priv;
 393
 394         dprintk("%s(%d)\n", __func__, inverted);
 395
 396         if (inverted == 1)
 397                 return s5h1409_writereg(state, 0x1b, 0x1101); /* Inverted */
 398         else
 399                 return s5h1409_writereg(state, 0x1b, 0x0110); /* Normal */
 400 }
 401
 402 static int s5h1409_enable_modulation(struct dvb_frontend *fe,
 403                                      enum fe_modulation m)
 404 {
 405         struct s5h1409_state *state = fe->demodulator_priv;
 406
 407         dprintk("%s(0x%08x)\n", __func__, m);
 408
 409         switch (m) {
 410         case VSB_8:
 411                 dprintk("%s() VSB_8\n", __func__);
 412                 if (state->if_freq != S5H1409_VSB_IF_FREQ)
 413                         s5h1409_set_if_freq(fe, S5H1409_VSB_IF_FREQ);
 414                 s5h1409_writereg(state, 0xf4, 0);
 415                 break;
 416         case QAM_64:
 417         case QAM_256:
 418         case QAM_AUTO:
 419                 dprintk("%s() QAM_AUTO (64/256)\n", __func__);
 420                 if (state->if_freq != S5H1409_QAM_IF_FREQ)
 421                         s5h1409_set_if_freq(fe, S5H1409_QAM_IF_FREQ);
 422                 s5h1409_writereg(state, 0xf4, 1);
 423                 s5h1409_writereg(state, 0x85, 0x110);
 424                 break;
 425         default:
 426                 dprintk("%s() Invalid modulation\n", __func__);
 427                 return -EINVAL;
 428         }
 429
 430         state->current_modulation = m;
 431         s5h1409_softreset(fe);
 432
 433         return 0;
 434 }
 435
 436 static int s5h1409_i2c_gate_ctrl(struct dvb_frontend *fe, int enable)
 437 {
 438         struct s5h1409_state *state = fe->demodulator_priv;
 439
 440         dprintk("%s(%d)\n", __func__, enable);
 441
 442         if (enable)
 443                 return s5h1409_writereg(state, 0xf3, 1);
 444         else
 445                 return s5h1409_writereg(state, 0xf3, 0);
 446 }
 447
 448 static int s5h1409_set_gpio(struct dvb_frontend *fe, int enable)
 449 {
 450         struct s5h1409_state *state = fe->demodulator_priv;
 451
 452         dprintk("%s(%d)\n", __func__, enable);
 453
 454         if (enable)
 455                 return s5h1409_writereg(state, 0xe3,
 456                         s5h1409_readreg(state, 0xe3) | 0x1100);
 457         else
 458                 return s5h1409_writereg(state, 0xe3,
 459                         s5h1409_readreg(state, 0xe3) & 0xfeff);
 460 }
 461
 462 static int s5h1409_sleep(struct dvb_frontend *fe, int enable)
 463 {
 464         struct s5h1409_state *state = fe->demodulator_priv;
 465
 466         dprintk("%s(%d)\n", __func__, enable);
 467
 468         return s5h1409_writereg(state, 0xf2, enable);
 469 }
 470
 471 static int s5h1409_register_reset(struct dvb_frontend *fe)
 472 {
 473         struct s5h1409_state *state = fe->demodulator_priv;
 474
 475         dprintk("%s()\n", __func__);
 476
 477         return s5h1409_writereg(state, 0xfa, 0);
 478 }
 479
 480 static void s5h1409_set_qam_amhum_mode(struct dvb_frontend *fe)
 481 {
 482         struct s5h1409_state *state = fe->demodulator_priv;
 483         u16 reg;
 484
 485         if (state->qam_state < QAM_STATE_INTERLEAVE_SET) {
 486                 /* We should not perform amhum optimization until
 487                    the interleave mode has been configured */
 488                 return;
 489         }
 490
 491         if (state->qam_state == QAM_STATE_QAM_OPTIMIZED_L3) {
 492                 /* We've already reached the maximum optimization level, so
 493                    dont bother banging on the status registers */
 494                 return;
 495         }
 496
 497         /* QAM EQ lock check */
 498         reg = s5h1409_readreg(state, 0xf0);
 499
 500         if ((reg >> 13) & 0x1) {
 501                 reg &= 0xff;
 502
 503                 s5h1409_writereg(state, 0x96, 0x000c);
 504                 if (reg < 0x68) {
 505                         if (state->qam_state < QAM_STATE_QAM_OPTIMIZED_L3) {
 506                                 dprintk("%s() setting QAM state to OPT_L3\n",
 507                                         __func__);
 508                                 s5h1409_writereg(state, 0x93, 0x3130);
 509                                 s5h1409_writereg(state, 0x9e, 0x2836);
 510                                 state->qam_state = QAM_STATE_QAM_OPTIMIZED_L3;
 511                         }
 512                 } else {
 513                         if (state->qam_state < QAM_STATE_QAM_OPTIMIZED_L2) {
 514                                 dprintk("%s() setting QAM state to OPT_L2\n",
 515                                         __func__);
 516                                 s5h1409_writereg(state, 0x93, 0x3332);
 517                                 s5h1409_writereg(state, 0x9e, 0x2c37);
 518                                 state->qam_state = QAM_STATE_QAM_OPTIMIZED_L2;
 519                         }
 520                 }
 521
 522         } else {
 523                 if (state->qam_state < QAM_STATE_QAM_OPTIMIZED_L1) {
 524                         dprintk("%s() setting QAM state to OPT_L1\n", __func__);
 525                         s5h1409_writereg(state, 0x96, 0x0008);
 526                         s5h1409_writereg(state, 0x93, 0x3332);
 527                         s5h1409_writereg(state, 0x9e, 0x2c37);
 528                         state->qam_state = QAM_STATE_QAM_OPTIMIZED_L1;
 529                 }
 530         }
 531 }
 532
 533 static void s5h1409_set_qam_amhum_mode_legacy(struct dvb_frontend *fe)
 534 {
 535         struct s5h1409_state *state = fe->demodulator_priv;
 536         u16 reg;
 537
 538         if (state->is_qam_locked)
 539                 return;
 540
 541         /* QAM EQ lock check */
 542         reg = s5h1409_readreg(state, 0xf0);
 543
 544         if ((reg >> 13) & 0x1) {
 545
 546                 state->is_qam_locked = 1;
 547                 reg &= 0xff;
 548
 549                 s5h1409_writereg(state, 0x96, 0x00c);
 550                 if ((reg < 0x38) || (reg > 0x68)) {
 551                         s5h1409_writereg(state, 0x93, 0x3332);
 552                         s5h1409_writereg(state, 0x9e, 0x2c37);
 553                 } else {
 554                         s5h1409_writereg(state, 0x93, 0x3130);
 555                         s5h1409_writereg(state, 0x9e, 0x2836);
 556                 }
 557
 558         } else {
 559                 s5h1409_writereg(state, 0x96, 0x0008);
 560                 s5h1409_writereg(state, 0x93, 0x3332);
 561                 s5h1409_writereg(state, 0x9e, 0x2c37);
 562         }
 563 }
 564
 565 static void s5h1409_set_qam_interleave_mode(struct dvb_frontend *fe)
 566 {
 567         struct s5h1409_state *state = fe->demodulator_priv;
 568         u16 reg, reg1, reg2;
 569
 570         if (state->qam_state >= QAM_STATE_INTERLEAVE_SET) {
 571                 /* We've done the optimization already */
 572                 return;
 573         }
 574
 575         reg = s5h1409_readreg(state, 0xf1);
 576
 577         /* Master lock */
 578         if ((reg >> 15) & 0x1) {
 579                 if (state->qam_state == QAM_STATE_UNTUNED ||
 580                     state->qam_state == QAM_STATE_TUNING_STARTED) {
 581                         dprintk("%s() setting QAM state to INTERLEAVE_SET\n",
 582                                 __func__);
 583                         reg1 = s5h1409_readreg(state, 0xb2);
 584                         reg2 = s5h1409_readreg(state, 0xad);
 585
 586                         s5h1409_writereg(state, 0x96, 0x0020);
 587                         s5h1409_writereg(state, 0xad,
 588                                 (((reg1 & 0xf000) >> 4) | (reg2 & 0xf0ff)));
 589                         state->qam_state = QAM_STATE_INTERLEAVE_SET;
 590                 }
 591         } else {
 592                 if (state->qam_state == QAM_STATE_UNTUNED) {
 593                         dprintk("%s() setting QAM state to TUNING_STARTED\n",
 594                                 __func__);
 595                         s5h1409_writereg(state, 0x96, 0x08);
 596                         s5h1409_writereg(state, 0xab,
 597                                 s5h1409_readreg(state, 0xab) | 0x1001);
 598                         state->qam_state = QAM_STATE_TUNING_STARTED;
 599                 }
 600         }
 601 }
 602
 603 static void s5h1409_set_qam_interleave_mode_legacy(struct dvb_frontend *fe)
 604 {
 605         struct s5h1409_state *state = fe->demodulator_priv;
 606         u16 reg, reg1, reg2;
 607
 608         reg = s5h1409_readreg(state, 0xf1);
 609
 610         /* Master lock */
 611         if ((reg >> 15) & 0x1) {
 612                 if (state->qam_state != 2) {
 613                         state->qam_state = 2;
 614                         reg1 = s5h1409_readreg(state, 0xb2);
 615                         reg2 = s5h1409_readreg(state, 0xad);
 616
 617                         s5h1409_writereg(state, 0x96, 0x20);
 618                         s5h1409_writereg(state, 0xad,
 619                                 (((reg1 & 0xf000) >> 4) | (reg2 & 0xf0ff)));
 620                         s5h1409_writereg(state, 0xab,
 621                                 s5h1409_readreg(state, 0xab) & 0xeffe);
 622                 }
 623         } else {
 624                 if (state->qam_state != 1) {
 625                         state->qam_state = 1;
 626                         s5h1409_writereg(state, 0x96, 0x08);
 627                         s5h1409_writereg(state, 0xab,
 628                                 s5h1409_readreg(state, 0xab) | 0x1001);
 629                 }
 630         }
 631 }
 632
 633 /* Talk to the demod, set the FEC, GUARD, QAM settings etc */
 634 static int s5h1409_set_frontend(struct dvb_frontend *fe)
 635 {
 636         struct dtv_frontend_properties *p = &fe->dtv_property_cache;
 637         struct s5h1409_state *state = fe->demodulator_priv;
 638
 639         dprintk("%s(frequency=%d)\n", __func__, p->frequency);
 640
 641         s5h1409_softreset(fe);
 642
 643         state->current_frequency = p->frequency;
 644
 645         s5h1409_enable_modulation(fe, p->modulation);
 646
 647         if (fe->ops.tuner_ops.set_params) {
 648                 if (fe->ops.i2c_gate_ctrl)
 649                         fe->ops.i2c_gate_ctrl(fe, 1);
 650                 fe->ops.tuner_ops.set_params(fe);
 651                 if (fe->ops.i2c_gate_ctrl)
 652                         fe->ops.i2c_gate_ctrl(fe, 0);
 653         }
 654
 655         /* Issue a reset to the demod so it knows to resync against the
 656            newly tuned frequency */
 657         s5h1409_softreset(fe);
 658
 659         /* Optimize the demod for QAM */
 660         if (state->current_modulation != VSB_8) {
 661                 /* This almost certainly applies to all boards, but for now
 662                    only do it for the HVR-1600.  Once the other boards are
 663                    tested, the "legacy" versions can just go away */
 664                 if (state->config->hvr1600_opt == S5H1409_HVR1600_OPTIMIZE) {
 665                         s5h1409_set_qam_interleave_mode(fe);
 666                         s5h1409_set_qam_amhum_mode(fe);
 667                 } else {
 668                         s5h1409_set_qam_amhum_mode_legacy(fe);
 669                         s5h1409_set_qam_interleave_mode_legacy(fe);
 670                 }
 671         }
 672
 673         return 0;
 674 }
 675
 676 static int s5h1409_set_mpeg_timing(struct dvb_frontend *fe, int mode)
 677 {
 678         struct s5h1409_state *state = fe->demodulator_priv;
 679         u16 val;
 680
 681         dprintk("%s(%d)\n", __func__, mode);
 682
 683         val = s5h1409_readreg(state, 0xac) & 0xcfff;
 684         switch (mode) {
 685         case S5H1409_MPEGTIMING_CONTINUOUS_INVERTING_CLOCK:
 686                 val |= 0x0000;
 687                 break;
 688         case S5H1409_MPEGTIMING_CONTINUOUS_NONINVERTING_CLOCK:
 689                 dprintk("%s(%d) Mode1 or Defaulting\n", __func__, mode);
 690                 val |= 0x1000;
 691                 break;
 692         case S5H1409_MPEGTIMING_NONCONTINUOUS_INVERTING_CLOCK:
 693                 val |= 0x2000;
 694                 break;
 695         case S5H1409_MPEGTIMING_NONCONTINUOUS_NONINVERTING_CLOCK:
 696                 val |= 0x3000;
 697                 break;
 698         default:
 699                 return -EINVAL;
 700         }
 701
 702         /* Configure MPEG Signal Timing charactistics */
 703         return s5h1409_writereg(state, 0xac, val);
 704 }
 705
 706 /* Reset the demod hardware and reset all of the configuration registers
 707    to a default state. */
 708 static int s5h1409_init(struct dvb_frontend *fe)
 709 {
 710         int i;
 711
 712         struct s5h1409_state *state = fe->demodulator_priv;
 713         dprintk("%s()\n", __func__);
 714
 715         s5h1409_sleep(fe, 0);
 716         s5h1409_register_reset(fe);
 717
 718         for (i = 0; i < ARRAY_SIZE(init_tab); i++)
 719                 s5h1409_writereg(state, init_tab[i].reg, init_tab[i].data);
 720
 721         /* The datasheet says that after initialisation, VSB is default */
 722         state->current_modulation = VSB_8;
 723
 724         /* Optimize for the HVR-1600 if appropriate.  Note that some of these
 725            may get folded into the generic case after testing with other
 726            devices */
 727         if (state->config->hvr1600_opt == S5H1409_HVR1600_OPTIMIZE) {
 728                 /* VSB AGC REF */
 729                 s5h1409_writereg(state, 0x09, 0x0050);
 730
 731                 /* Unknown but Windows driver does it... */
 732                 s5h1409_writereg(state, 0x21, 0x0001);
 733                 s5h1409_writereg(state, 0x50, 0x030e);
 734
 735                 /* QAM AGC REF */
 736                 s5h1409_writereg(state, 0x82, 0x0800);
 737         }
 738
 739         if (state->config->output_mode == S5H1409_SERIAL_OUTPUT)
 740                 s5h1409_writereg(state, 0xab,
 741                         s5h1409_readreg(state, 0xab) | 0x100); /* Serial */
 742         else
 743                 s5h1409_writereg(state, 0xab,
 744                         s5h1409_readreg(state, 0xab) & 0xfeff); /* Parallel */
 745
 746         s5h1409_set_spectralinversion(fe, state->config->inversion);
 747         s5h1409_set_if_freq(fe, state->if_freq);
 748         s5h1409_set_gpio(fe, state->config->gpio);
 749         s5h1409_set_mpeg_timing(fe, state->config->mpeg_timing);
 750         s5h1409_softreset(fe);
 751
 752         /* Note: Leaving the I2C gate closed. */
 753         s5h1409_i2c_gate_ctrl(fe, 0);
 754
 755         return 0;
 756 }
 757
 758 static int s5h1409_read_status(struct dvb_frontend *fe, enum fe_status *status)
 759 {
 760         struct s5h1409_state *state = fe->demodulator_priv;
 761         u16 reg;
 762         u32 tuner_status = 0;
 763
 764         *status = 0;
 765
 766         /* Optimize the demod for QAM */
 767         if (state->current_modulation != VSB_8) {
 768                 /* This almost certainly applies to all boards, but for now
 769                    only do it for the HVR-1600.  Once the other boards are
 770                    tested, the "legacy" versions can just go away */
 771                 if (state->config->hvr1600_opt == S5H1409_HVR1600_OPTIMIZE) {
 772                         s5h1409_set_qam_interleave_mode(fe);
 773                         s5h1409_set_qam_amhum_mode(fe);
 774                 }
 775         }
 776
 777         /* Get the demodulator status */
 778         reg = s5h1409_readreg(state, 0xf1);
 779         if (reg & 0x1000)
 780                 *status |= FE_HAS_VITERBI;
 781         if (reg & 0x8000)
 782                 *status |= FE_HAS_LOCK | FE_HAS_SYNC;
 783
 784         switch (state->config->status_mode) {
 785         case S5H1409_DEMODLOCKING:
 786                 if (*status & FE_HAS_VITERBI)
 787                         *status |= FE_HAS_CARRIER | FE_HAS_SIGNAL;
 788                 break;
 789         case S5H1409_TUNERLOCKING:
 790                 /* Get the tuner status */
 791                 if (fe->ops.tuner_ops.get_status) {
 792                         if (fe->ops.i2c_gate_ctrl)
 793                                 fe->ops.i2c_gate_ctrl(fe, 1);
 794
 795                         fe->ops.tuner_ops.get_status(fe, &tuner_status);
 796
 797                         if (fe->ops.i2c_gate_ctrl)
 798                                 fe->ops.i2c_gate_ctrl(fe, 0);
 799                 }
 800                 if (tuner_status)
 801                         *status |= FE_HAS_CARRIER | FE_HAS_SIGNAL;
 802                 break;
 803         }
 804
 805         dprintk("%s() status 0x%08x\n", __func__, *status);
 806
 807         return 0;
 808 }
 809
 810 static int s5h1409_qam256_lookup_snr(struct dvb_frontend *fe, u16 *snr, u16 v)
 811 {
 812         int i, ret = -EINVAL;
 813         dprintk("%s()\n", __func__);
 814
 815         for (i = 0; i < ARRAY_SIZE(qam256_snr_tab); i++) {
 816                 if (v < qam256_snr_tab[i].val) {
 817                         *snr = qam256_snr_tab[i].data;
 818                         ret = 0;
 819                         break;
 820                 }
 821         }
 822         return ret;
 823 }
 824
 825 static int s5h1409_qam64_lookup_snr(struct dvb_frontend *fe, u16 *snr, u16 v)
 826 {
 827         int i, ret = -EINVAL;
 828         dprintk("%s()\n", __func__);
 829
 830         for (i = 0; i < ARRAY_SIZE(qam64_snr_tab); i++) {
 831                 if (v < qam64_snr_tab[i].val) {
 832                         *snr = qam64_snr_tab[i].data;
 833                         ret = 0;
 834                         break;
 835                 }
 836         }
 837         return ret;
 838 }
 839
 840 static int s5h1409_vsb_lookup_snr(struct dvb_frontend *fe, u16 *snr, u16 v)
 841 {
 842         int i, ret = -EINVAL;
 843         dprintk("%s()\n", __func__);
 844
 845         for (i = 0; i < ARRAY_SIZE(vsb_snr_tab); i++) {
 846                 if (v > vsb_snr_tab[i].val) {
 847                         *snr = vsb_snr_tab[i].data;
 848                         ret = 0;
 849                         break;
 850                 }
 851         }
 852         dprintk("%s() snr=%d\n", __func__, *snr);
 853         return ret;
 854 }
 855
 856 static int s5h1409_read_snr(struct dvb_frontend *fe, u16 *snr)
 857 {
 858         struct s5h1409_state *state = fe->demodulator_priv;
 859         u16 reg;
 860         dprintk("%s()\n", __func__);
 861
 862         switch (state->current_modulation) {
 863         case QAM_64:
 864                 reg = s5h1409_readreg(state, 0xf0) & 0xff;
 865                 return s5h1409_qam64_lookup_snr(fe, snr, reg);
 866         case QAM_256:
 867                 reg = s5h1409_readreg(state, 0xf0) & 0xff;
 868                 return s5h1409_qam256_lookup_snr(fe, snr, reg);
 869         case VSB_8:
 870                 reg = s5h1409_readreg(state, 0xf1) & 0x3ff;
 871                 return s5h1409_vsb_lookup_snr(fe, snr, reg);
 872         default:
 873                 break;
 874         }
 875
 876         return -EINVAL;
 877 }
 878
 879 static int s5h1409_read_signal_strength(struct dvb_frontend *fe,
 880                                         u16 *signal_strength)
 881 {
 882         /* borrowed from lgdt330x.c
 883          *
 884          * Calculate strength from SNR up to 35dB
 885          * Even though the SNR can go higher than 35dB,
 886          * there is some comfort factor in having a range of
 887          * strong signals that can show at 100%
 888          */
 889         u16 snr;
 890         u32 tmp;
 891         int ret = s5h1409_read_snr(fe, &snr);
 892
 893         *signal_strength = 0;
 894
 895         if (0 == ret) {
 896                 /* The following calculation method was chosen
 897                  * purely for the sake of code re-use from the
 898                  * other demod drivers that use this method */
 899
 900                 /* Convert from SNR in dB * 10 to 8.24 fixed-point */
 901                 tmp = (snr * ((1 << 24) / 10));
 902
 903                 /* Convert from 8.24 fixed-point to
 904                  * scale the range 0 - 35*2^24 into 0 - 65535*/
 905                 if (tmp >= 8960 * 0x10000)
 906                         *signal_strength = 0xffff;
 907                 else
 908                         *signal_strength = tmp / 8960;
 909         }
 910
 911         return ret;
 912 }
 913
 914 static int s5h1409_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
 915 {
 916         struct s5h1409_state *state = fe->demodulator_priv;
 917
 918         *ucblocks = s5h1409_readreg(state, 0xb5);
 919
 920         return 0;
 921 }
 922
 923 static int s5h1409_read_ber(struct dvb_frontend *fe, u32 *ber)
 924 {
 925         return s5h1409_read_ucblocks(fe, ber);
 926 }
 927
 928 static int s5h1409_get_frontend(struct dvb_frontend *fe,
 929                                 struct dtv_frontend_properties *p)
 930 {
 931         struct s5h1409_state *state = fe->demodulator_priv;
 932
 933         p->frequency = state->current_frequency;
 934         p->modulation = state->current_modulation;
 935
 936         return 0;
 937 }
 938
 939 static int s5h1409_get_tune_settings(struct dvb_frontend *fe,
 940                                      struct dvb_frontend_tune_settings *tune)
 941 {
 942         tune->min_delay_ms = 1000;
 943         return 0;
 944 }
 945
 946 static void s5h1409_release(struct dvb_frontend *fe)
 947 {
 948         struct s5h1409_state *state = fe->demodulator_priv;
 949         kfree(state);
 950 }
 951
 952 static const struct dvb_frontend_ops s5h1409_ops;
 953
 954 struct dvb_frontend *s5h1409_attach(const struct s5h1409_config *config,
 955                                     struct i2c_adapter *i2c)
 956 {
 957         struct s5h1409_state *state = NULL;
 958         u16 reg;
 959
 960         /* allocate memory for the internal state */
 961         state = kzalloc(sizeof(struct s5h1409_state), GFP_KERNEL);
 962         if (state == NULL)
 963                 goto error;
 964
 965         /* setup the state */
 966         state->config = config;
 967         state->i2c = i2c;
 968         state->current_modulation = 0;
 969         state->if_freq = S5H1409_VSB_IF_FREQ;
 970
 971         /* check if the demod exists */
 972         reg = s5h1409_readreg(state, 0x04);
 973         if ((reg != 0x0066) && (reg != 0x007f))
 974                 goto error;
 975
 976         /* create dvb_frontend */
 977         memcpy(&state->frontend.ops, &s5h1409_ops,
 978                sizeof(struct dvb_frontend_ops));
 979         state->frontend.demodulator_priv = state;
 980
 981         if (s5h1409_init(&state->frontend) != 0) {
 982                 printk(KERN_ERR "%s: Failed to initialize correctly\n",
 983                         __func__);
 984                 goto error;
 985         }
 986
 987         /* Note: Leaving the I2C gate open here. */
 988         s5h1409_i2c_gate_ctrl(&state->frontend, 1);
 989
 990         return &state->frontend;
 991
 992 error:
 993         kfree(state);
 994         return NULL;
 995 }
 996 EXPORT_SYMBOL(s5h1409_attach);
 997
 998 static const struct dvb_frontend_ops s5h1409_ops = {
 999         .delsys = { SYS_ATSC, SYS_DVBC_ANNEX_B },
1000         .info = {
1001                 .name                   = "Samsung S5H1409 QAM/8VSB Frontend",
1002                 .frequency_min_hz       =  54 * MHz,
1003                 .frequency_max_hz       = 858 * MHz,
1004                 .frequency_stepsize_hz  = 62500,
1005                 .caps = FE_CAN_QAM_64 | FE_CAN_QAM_256 | FE_CAN_8VSB
1006         },
1007
1008         .init                 = s5h1409_init,
1009         .i2c_gate_ctrl        = s5h1409_i2c_gate_ctrl,
1010         .set_frontend         = s5h1409_set_frontend,
1011         .get_frontend         = s5h1409_get_frontend,
1012         .get_tune_settings    = s5h1409_get_tune_settings,
1013         .read_status          = s5h1409_read_status,
1014         .read_ber             = s5h1409_read_ber,
1015         .read_signal_strength = s5h1409_read_signal_strength,
1016         .read_snr             = s5h1409_read_snr,
1017         .read_ucblocks        = s5h1409_read_ucblocks,
1018         .release              = s5h1409_release,
1019 };
1020
1021 MODULE_DESCRIPTION("Samsung S5H1409 QAM-B/ATSC Demodulator driver");
1022 MODULE_AUTHOR("Steven Toth");
1023 MODULE_LICENSE("GPL");