sound/soc/codecs/wm8804.c

   1 /*
   2  * wm8804.c  --  WM8804 S/PDIF transceiver driver
   3  *
   4  * Copyright 2010 Wolfson Microelectronics plc
   5  *
   6  * Author: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/moduleparam.h>
  15 #include <linux/init.h>
  16 #include <linux/delay.h>
  17 #include <linux/pm.h>
  18 #include <linux/i2c.h>
  19 #include <linux/spi/spi.h>
  20 #include <linux/regulator/consumer.h>
  21 #include <linux/slab.h>
  22 #include <sound/core.h>
  23 #include <sound/pcm.h>
  24 #include <sound/pcm_params.h>
  25 #include <sound/soc.h>
  26 #include <sound/initval.h>
  27 #include <sound/tlv.h>
  28
  29 #include "wm8804.h"
  30
  31 #define WM8804_NUM_SUPPLIES 2
  32 static const char *wm8804_supply_names[WM8804_NUM_SUPPLIES] = {
  33         "PVDD",
  34         "DVDD"
  35 };
  36
  37 static const u8 wm8804_reg_defs[] = {
  38         0x05,     /* R0  - RST/DEVID1 */
  39         0x88,     /* R1  - DEVID2 */
  40         0x04,     /* R2  - DEVREV */
  41         0x21,     /* R3  - PLL1 */
  42         0xFD,     /* R4  - PLL2 */
  43         0x36,     /* R5  - PLL3 */
  44         0x07,     /* R6  - PLL4 */
  45         0x16,     /* R7  - PLL5 */
  46         0x18,     /* R8  - PLL6 */
  47         0xFF,     /* R9  - SPDMODE */
  48         0x00,     /* R10 - INTMASK */
  49         0x00,     /* R11 - INTSTAT */
  50         0x00,     /* R12 - SPDSTAT */
  51         0x00,     /* R13 - RXCHAN1 */
  52         0x00,     /* R14 - RXCHAN2 */
  53         0x00,     /* R15 - RXCHAN3 */
  54         0x00,     /* R16 - RXCHAN4 */
  55         0x00,     /* R17 - RXCHAN5 */
  56         0x00,     /* R18 - SPDTX1 */
  57         0x00,     /* R19 - SPDTX2 */
  58         0x00,     /* R20 - SPDTX3 */
  59         0x71,     /* R21 - SPDTX4 */
  60         0x0B,     /* R22 - SPDTX5 */
  61         0x70,     /* R23 - GPO0 */
  62         0x57,     /* R24 - GPO1 */
  63         0x00,     /* R25 */
  64         0x42,     /* R26 - GPO2 */
  65         0x06,     /* R27 - AIFTX */
  66         0x06,     /* R28 - AIFRX */
  67         0x80,     /* R29 - SPDRX1 */
  68         0x07,     /* R30 - PWRDN */
  69 };
  70
  71 struct wm8804_priv {
  72         enum snd_soc_control_type control_type;
  73         struct regulator_bulk_data supplies[WM8804_NUM_SUPPLIES];
  74         struct notifier_block disable_nb[WM8804_NUM_SUPPLIES];
  75         struct snd_soc_codec *codec;
  76 };
  77
  78 static int txsrc_get(struct snd_kcontrol *kcontrol,
  79                      struct snd_ctl_elem_value *ucontrol);
  80
  81 static int txsrc_put(struct snd_kcontrol *kcontrol,
  82                      struct snd_ctl_elem_value *ucontrol);
  83
  84 /*
  85  * We can't use the same notifier block for more than one supply and
  86  * there's no way I can see to get from a callback to the caller
  87  * except container_of().
  88  */
  89 #define WM8804_REGULATOR_EVENT(n) \
  90 static int wm8804_regulator_event_##n(struct notifier_block *nb, \
  91                                       unsigned long event, void *data)    \
  92 { \
  93         struct wm8804_priv *wm8804 = container_of(nb, struct wm8804_priv, \
  94                                                   disable_nb[n]); \
  95         if (event & REGULATOR_EVENT_DISABLE) { \
  96                 wm8804->codec->cache_sync = 1; \
  97         } \
  98         return 0; \
  99 }
 100
 101 WM8804_REGULATOR_EVENT(0)
 102 WM8804_REGULATOR_EVENT(1)
 103
 104 static const char *txsrc_text[] = { "S/PDIF RX", "AIF" };
 105 static const SOC_ENUM_SINGLE_EXT_DECL(txsrc, txsrc_text);
 106
 107 static const struct snd_kcontrol_new wm8804_snd_controls[] = {
 108         SOC_ENUM_EXT("Input Source", txsrc, txsrc_get, txsrc_put),
 109         SOC_SINGLE("TX Playback Switch", WM8804_PWRDN, 2, 1, 1),
 110         SOC_SINGLE("AIF Playback Switch", WM8804_PWRDN, 4, 1, 1)
 111 };
 112
 113 static int txsrc_get(struct snd_kcontrol *kcontrol,
 114                      struct snd_ctl_elem_value *ucontrol)
 115 {
 116         struct snd_soc_codec *codec;
 117         unsigned int src;
 118
 119         codec = snd_kcontrol_chip(kcontrol);
 120         src = snd_soc_read(codec, WM8804_SPDTX4);
 121         if (src & 0x40)
 122                 ucontrol->value.integer.value[0] = 1;
 123         else
 124                 ucontrol->value.integer.value[0] = 0;
 125
 126         return 0;
 127 }
 128
 129 static int txsrc_put(struct snd_kcontrol *kcontrol,
 130                      struct snd_ctl_elem_value *ucontrol)
 131 {
 132         struct snd_soc_codec *codec;
 133         unsigned int src, txpwr;
 134
 135         codec = snd_kcontrol_chip(kcontrol);
 136
 137         if (ucontrol->value.integer.value[0] != 0
 138                         && ucontrol->value.integer.value[0] != 1)
 139                 return -EINVAL;
 140
 141         src = snd_soc_read(codec, WM8804_SPDTX4);
 142         switch ((src & 0x40) >> 6) {
 143         case 0:
 144                 if (!ucontrol->value.integer.value[0])
 145                         return 0;
 146                 break;
 147         case 1:
 148                 if (ucontrol->value.integer.value[1])
 149                         return 0;
 150                 break;
 151         }
 152
 153         /* save the current power state of the transmitter */
 154         txpwr = snd_soc_read(codec, WM8804_PWRDN) & 0x4;
 155         /* power down the transmitter */
 156         snd_soc_update_bits(codec, WM8804_PWRDN, 0x4, 0x4);
 157         /* set the tx source */
 158         snd_soc_update_bits(codec, WM8804_SPDTX4, 0x40,
 159                             ucontrol->value.integer.value[0] << 6);
 160
 161         if (ucontrol->value.integer.value[0]) {
 162                 /* power down the receiver */
 163                 snd_soc_update_bits(codec, WM8804_PWRDN, 0x2, 0x2);
 164                 /* power up the AIF */
 165                 snd_soc_update_bits(codec, WM8804_PWRDN, 0x10, 0);
 166         } else {
 167                 /* don't power down the AIF -- may be used as an output */
 168                 /* power up the receiver */
 169                 snd_soc_update_bits(codec, WM8804_PWRDN, 0x2, 0);
 170         }
 171
 172         /* restore the transmitter's configuration */
 173         snd_soc_update_bits(codec, WM8804_PWRDN, 0x4, txpwr);
 174
 175         return 0;
 176 }
 177
 178 static int wm8804_volatile(struct snd_soc_codec *codec, unsigned int reg)
 179 {
 180         switch (reg) {
 181         case WM8804_RST_DEVID1:
 182         case WM8804_DEVID2:
 183         case WM8804_DEVREV:
 184         case WM8804_INTSTAT:
 185         case WM8804_SPDSTAT:
 186         case WM8804_RXCHAN1:
 187         case WM8804_RXCHAN2:
 188         case WM8804_RXCHAN3:
 189         case WM8804_RXCHAN4:
 190         case WM8804_RXCHAN5:
 191                 return 1;
 192         default:
 193                 break;
 194         }
 195
 196         return 0;
 197 }
 198
 199 static int wm8804_reset(struct snd_soc_codec *codec)
 200 {
 201         return snd_soc_write(codec, WM8804_RST_DEVID1, 0x0);
 202 }
 203
 204 static int wm8804_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
 205 {
 206         struct snd_soc_codec *codec;
 207         u16 format, master, bcp, lrp;
 208
 209         codec = dai->codec;
 210
 211         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 212         case SND_SOC_DAIFMT_I2S:
 213                 format = 0x2;
 214                 break;
 215         case SND_SOC_DAIFMT_RIGHT_J:
 216                 format = 0x0;
 217                 break;
 218         case SND_SOC_DAIFMT_LEFT_J:
 219                 format = 0x1;
 220                 break;
 221         case SND_SOC_DAIFMT_DSP_A:
 222         case SND_SOC_DAIFMT_DSP_B:
 223                 format = 0x3;
 224                 break;
 225         default:
 226                 dev_err(dai->dev, "Unknown dai format\n");
 227                 return -EINVAL;
 228         }
 229
 230         /* set data format */
 231         snd_soc_update_bits(codec, WM8804_AIFTX, 0x3, format);
 232         snd_soc_update_bits(codec, WM8804_AIFRX, 0x3, format);
 233
 234         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 235         case SND_SOC_DAIFMT_CBM_CFM:
 236                 master = 1;
 237                 break;
 238         case SND_SOC_DAIFMT_CBS_CFS:
 239                 master = 0;
 240                 break;
 241         default:
 242                 dev_err(dai->dev, "Unknown master/slave configuration\n");
 243                 return -EINVAL;
 244         }
 245
 246         /* set master/slave mode */
 247         snd_soc_update_bits(codec, WM8804_AIFRX, 0x40, master << 6);
 248
 249         bcp = lrp = 0;
 250         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 251         case SND_SOC_DAIFMT_NB_NF:
 252                 break;
 253         case SND_SOC_DAIFMT_IB_IF:
 254                 bcp = lrp = 1;
 255                 break;
 256         case SND_SOC_DAIFMT_IB_NF:
 257                 bcp = 1;
 258                 break;
 259         case SND_SOC_DAIFMT_NB_IF:
 260                 lrp = 1;
 261                 break;
 262         default:
 263                 dev_err(dai->dev, "Unknown polarity configuration\n");
 264                 return -EINVAL;
 265         }
 266
 267         /* set frame inversion */
 268         snd_soc_update_bits(codec, WM8804_AIFTX, 0x10 | 0x20,
 269                             (bcp << 4) | (lrp << 5));
 270         snd_soc_update_bits(codec, WM8804_AIFRX, 0x10 | 0x20,
 271                             (bcp << 4) | (lrp << 5));
 272         return 0;
 273 }
 274
 275 static int wm8804_hw_params(struct snd_pcm_substream *substream,
 276                             struct snd_pcm_hw_params *params,
 277                             struct snd_soc_dai *dai)
 278 {
 279         struct snd_soc_codec *codec;
 280         u16 blen;
 281
 282         codec = dai->codec;
 283
 284         switch (params_format(params)) {
 285         case SNDRV_PCM_FORMAT_S16_LE:
 286                 blen = 0x0;
 287                 break;
 288         case SNDRV_PCM_FORMAT_S20_3LE:
 289                 blen = 0x1;
 290                 break;
 291         case SNDRV_PCM_FORMAT_S24_LE:
 292                 blen = 0x2;
 293                 break;
 294         default:
 295                 dev_err(dai->dev, "Unsupported word length: %u\n",
 296                         params_format(params));
 297                 return -EINVAL;
 298         }
 299
 300         /* set word length */
 301         snd_soc_update_bits(codec, WM8804_AIFTX, 0xc, blen << 2);
 302         snd_soc_update_bits(codec, WM8804_AIFRX, 0xc, blen << 2);
 303
 304         return 0;
 305 }
 306
 307 struct pll_div {
 308         u32 prescale:1;
 309         u32 mclkdiv:1;
 310         u32 freqmode:2;
 311         u32 n:4;
 312         u32 k:22;
 313 };
 314
 315 /* PLL rate to output rate divisions */
 316 static struct {
 317         unsigned int div;
 318         unsigned int freqmode;
 319         unsigned int mclkdiv;
 320 } post_table[] = {
 321         {  2,  0, 0 },
 322         {  4,  0, 1 },
 323         {  4,  1, 0 },
 324         {  8,  1, 1 },
 325         {  8,  2, 0 },
 326         { 16,  2, 1 },
 327         { 12,  3, 0 },
 328         { 24,  3, 1 }
 329 };
 330
 331 #define FIXED_PLL_SIZE ((1ULL << 22) * 10)
 332 static int pll_factors(struct pll_div *pll_div, unsigned int target,
 333                        unsigned int source)
 334 {
 335         u64 Kpart;
 336         unsigned long int K, Ndiv, Nmod, tmp;
 337         int i;
 338
 339         /*
 340          * Scale the output frequency up; the PLL should run in the
 341          * region of 90-100MHz.
 342          */
 343         for (i = 0; i < ARRAY_SIZE(post_table); i++) {
 344                 tmp = target * post_table[i].div;
 345                 if (tmp >= 90000000 && tmp <= 100000000) {
 346                         pll_div->freqmode = post_table[i].freqmode;
 347                         pll_div->mclkdiv = post_table[i].mclkdiv;
 348                         target *= post_table[i].div;
 349                         break;
 350                 }
 351         }
 352
 353         if (i == ARRAY_SIZE(post_table)) {
 354                 pr_err("%s: Unable to scale output frequency: %uHz\n",
 355                        __func__, target);
 356                 return -EINVAL;
 357         }
 358
 359         pll_div->prescale = 0;
 360         Ndiv = target / source;
 361         if (Ndiv < 5) {
 362                 source >>= 1;
 363                 pll_div->prescale = 1;
 364                 Ndiv = target / source;
 365         }
 366
 367         if (Ndiv < 5 || Ndiv > 13) {
 368                 pr_err("%s: WM8804 N value is not within the recommended range: %lu\n",
 369                        __func__, Ndiv);
 370                 return -EINVAL;
 371         }
 372         pll_div->n = Ndiv;
 373
 374         Nmod = target % source;
 375         Kpart = FIXED_PLL_SIZE * (u64)Nmod;
 376
 377         do_div(Kpart, source);
 378
 379         K = Kpart & 0xffffffff;
 380         if ((K % 10) >= 5)
 381                 K += 5;
 382         K /= 10;
 383         pll_div->k = K;
 384
 385         return 0;
 386 }
 387
 388 static int wm8804_set_pll(struct snd_soc_dai *dai, int pll_id,
 389                           int source, unsigned int freq_in,
 390                           unsigned int freq_out)
 391 {
 392         struct snd_soc_codec *codec;
 393
 394         codec = dai->codec;
 395         if (!freq_in || !freq_out) {
 396                 /* disable the PLL */
 397                 snd_soc_update_bits(codec, WM8804_PWRDN, 0x1, 0x1);
 398                 return 0;
 399         } else {
 400                 int ret;
 401                 struct pll_div pll_div;
 402
 403                 ret = pll_factors(&pll_div, freq_out, freq_in);
 404                 if (ret)
 405                         return ret;
 406
 407                 /* power down the PLL before reprogramming it */
 408                 snd_soc_update_bits(codec, WM8804_PWRDN, 0x1, 0x1);
 409
 410                 if (!freq_in || !freq_out)
 411                         return 0;
 412
 413                 /* set PLLN and PRESCALE */
 414                 snd_soc_update_bits(codec, WM8804_PLL4, 0xf | 0x10,
 415                                     pll_div.n | (pll_div.prescale << 4));
 416                 /* set mclkdiv and freqmode */
 417                 snd_soc_update_bits(codec, WM8804_PLL5, 0x3 | 0x8,
 418                                     pll_div.freqmode | (pll_div.mclkdiv << 3));
 419                 /* set PLLK */
 420                 snd_soc_write(codec, WM8804_PLL1, pll_div.k & 0xff);
 421                 snd_soc_write(codec, WM8804_PLL2, (pll_div.k >> 8) & 0xff);
 422                 snd_soc_write(codec, WM8804_PLL3, pll_div.k >> 16);
 423
 424                 /* power up the PLL */
 425                 snd_soc_update_bits(codec, WM8804_PWRDN, 0x1, 0);
 426         }
 427
 428         return 0;
 429 }
 430
 431 static int wm8804_set_sysclk(struct snd_soc_dai *dai,
 432                              int clk_id, unsigned int freq, int dir)
 433 {
 434         struct snd_soc_codec *codec;
 435
 436         codec = dai->codec;
 437
 438         switch (clk_id) {
 439         case WM8804_TX_CLKSRC_MCLK:
 440                 if ((freq >= 10000000 && freq <= 14400000)
 441                                 || (freq >= 16280000 && freq <= 27000000))
 442                         snd_soc_update_bits(codec, WM8804_PLL6, 0x80, 0x80);
 443                 else {
 444                         dev_err(dai->dev, "OSCCLOCK is not within the "
 445                                 "recommended range: %uHz\n", freq);
 446                         return -EINVAL;
 447                 }
 448                 break;
 449         case WM8804_TX_CLKSRC_PLL:
 450                 snd_soc_update_bits(codec, WM8804_PLL6, 0x80, 0);
 451                 break;
 452         case WM8804_CLKOUT_SRC_CLK1:
 453                 snd_soc_update_bits(codec, WM8804_PLL6, 0x8, 0);
 454                 break;
 455         case WM8804_CLKOUT_SRC_OSCCLK:
 456                 snd_soc_update_bits(codec, WM8804_PLL6, 0x8, 0x8);
 457                 break;
 458         default:
 459                 dev_err(dai->dev, "Unknown clock source: %d\n", clk_id);
 460                 return -EINVAL;
 461         }
 462
 463         return 0;
 464 }
 465
 466 static int wm8804_set_clkdiv(struct snd_soc_dai *dai,
 467                              int div_id, int div)
 468 {
 469         struct snd_soc_codec *codec;
 470
 471         codec = dai->codec;
 472         switch (div_id) {
 473         case WM8804_CLKOUT_DIV:
 474                 snd_soc_update_bits(codec, WM8804_PLL5, 0x30,
 475                                     (div & 0x3) << 4);
 476                 break;
 477         default:
 478                 dev_err(dai->dev, "Unknown clock divider: %d\n", div_id);
 479                 return -EINVAL;
 480         }
 481         return 0;
 482 }
 483
 484 static void wm8804_sync_cache(struct snd_soc_codec *codec)
 485 {
 486         short i;
 487         u8 *cache;
 488
 489         if (!codec->cache_sync)
 490                 return;
 491
 492         codec->cache_only = 0;
 493         cache = codec->reg_cache;
 494         for (i = 0; i < codec->driver->reg_cache_size; i++) {
 495                 if (i == WM8804_RST_DEVID1 || cache[i] == wm8804_reg_defs[i])
 496                         continue;
 497                 snd_soc_write(codec, i, cache[i]);
 498         }
 499         codec->cache_sync = 0;
 500 }
 501
 502 static int wm8804_set_bias_level(struct snd_soc_codec *codec,
 503                                  enum snd_soc_bias_level level)
 504 {
 505         int ret;
 506         struct wm8804_priv *wm8804;
 507
 508         wm8804 = snd_soc_codec_get_drvdata(codec);
 509         switch (level) {
 510         case SND_SOC_BIAS_ON:
 511                 break;
 512         case SND_SOC_BIAS_PREPARE:
 513                 /* power up the OSC and the PLL */
 514                 snd_soc_update_bits(codec, WM8804_PWRDN, 0x9, 0);
 515                 break;
 516         case SND_SOC_BIAS_STANDBY:
 517                 if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
 518                         ret = regulator_bulk_enable(ARRAY_SIZE(wm8804->supplies),
 519                                                     wm8804->supplies);
 520                         if (ret) {
 521                                 dev_err(codec->dev,
 522                                         "Failed to enable supplies: %d\n",
 523                                         ret);
 524                                 return ret;
 525                         }
 526                         wm8804_sync_cache(codec);
 527                 }
 528                 /* power down the OSC and the PLL */
 529                 snd_soc_update_bits(codec, WM8804_PWRDN, 0x9, 0x9);
 530                 break;
 531         case SND_SOC_BIAS_OFF:
 532                 /* power down the OSC and the PLL */
 533                 snd_soc_update_bits(codec, WM8804_PWRDN, 0x9, 0x9);
 534                 regulator_bulk_disable(ARRAY_SIZE(wm8804->supplies),
 535                                        wm8804->supplies);
 536                 break;
 537         }
 538
 539         codec->dapm.bias_level = level;
 540         return 0;
 541 }
 542
 543 #ifdef CONFIG_PM
 544 static int wm8804_suspend(struct snd_soc_codec *codec, pm_message_t state)
 545 {
 546         wm8804_set_bias_level(codec, SND_SOC_BIAS_OFF);
 547         return 0;
 548 }
 549
 550 static int wm8804_resume(struct snd_soc_codec *codec)
 551 {
 552         wm8804_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 553         return 0;
 554 }
 555 #else
 556 #define wm8804_suspend NULL
 557 #define wm8804_resume NULL
 558 #endif
 559
 560 static int wm8804_remove(struct snd_soc_codec *codec)
 561 {
 562         struct wm8804_priv *wm8804;
 563         int i;
 564
 565         wm8804 = snd_soc_codec_get_drvdata(codec);
 566         wm8804_set_bias_level(codec, SND_SOC_BIAS_OFF);
 567
 568         for (i = 0; i < ARRAY_SIZE(wm8804->supplies); ++i)
 569                 regulator_unregister_notifier(wm8804->supplies[i].consumer,
 570                                               &wm8804->disable_nb[i]);
 571         regulator_bulk_free(ARRAY_SIZE(wm8804->supplies), wm8804->supplies);
 572         return 0;
 573 }
 574
 575 static int wm8804_probe(struct snd_soc_codec *codec)
 576 {
 577         struct wm8804_priv *wm8804;
 578         int i, id1, id2, ret;
 579
 580         wm8804 = snd_soc_codec_get_drvdata(codec);
 581         wm8804->codec = codec;
 582
 583         codec->dapm.idle_bias_off = 1;
 584
 585         ret = snd_soc_codec_set_cache_io(codec, 8, 8, wm8804->control_type);
 586         if (ret < 0) {
 587                 dev_err(codec->dev, "Failed to set cache i/o: %d\n", ret);
 588                 return ret;
 589         }
 590
 591         for (i = 0; i < ARRAY_SIZE(wm8804->supplies); i++)
 592                 wm8804->supplies[i].supply = wm8804_supply_names[i];
 593
 594         ret = regulator_bulk_get(codec->dev, ARRAY_SIZE(wm8804->supplies),
 595                                  wm8804->supplies);
 596         if (ret) {
 597                 dev_err(codec->dev, "Failed to request supplies: %d\n", ret);
 598                 return ret;
 599         }
 600
 601         wm8804->disable_nb[0].notifier_call = wm8804_regulator_event_0;
 602         wm8804->disable_nb[1].notifier_call = wm8804_regulator_event_1;
 603
 604         /* This should really be moved into the regulator core */
 605         for (i = 0; i < ARRAY_SIZE(wm8804->supplies); i++) {
 606                 ret = regulator_register_notifier(wm8804->supplies[i].consumer,
 607                                                   &wm8804->disable_nb[i]);
 608                 if (ret != 0) {
 609                         dev_err(codec->dev,
 610                                 "Failed to register regulator notifier: %d\n",
 611                                 ret);
 612                 }
 613         }
 614
 615         ret = regulator_bulk_enable(ARRAY_SIZE(wm8804->supplies),
 616                                     wm8804->supplies);
 617         if (ret) {
 618                 dev_err(codec->dev, "Failed to enable supplies: %d\n", ret);
 619                 goto err_reg_get;
 620         }
 621
 622         id1 = snd_soc_read(codec, WM8804_RST_DEVID1);
 623         if (id1 < 0) {
 624                 dev_err(codec->dev, "Failed to read device ID: %d\n", id1);
 625                 ret = id1;
 626                 goto err_reg_enable;
 627         }
 628
 629         id2 = snd_soc_read(codec, WM8804_DEVID2);
 630         if (id2 < 0) {
 631                 dev_err(codec->dev, "Failed to read device ID: %d\n", id2);
 632                 ret = id2;
 633                 goto err_reg_enable;
 634         }
 635
 636         id2 = (id2 << 8) | id1;
 637
 638         if (id2 != ((wm8804_reg_defs[WM8804_DEVID2] << 8)
 639                         | wm8804_reg_defs[WM8804_RST_DEVID1])) {
 640                 dev_err(codec->dev, "Invalid device ID: %#x\n", id2);
 641                 ret = -EINVAL;
 642                 goto err_reg_enable;
 643         }
 644
 645         ret = snd_soc_read(codec, WM8804_DEVREV);
 646         if (ret < 0) {
 647                 dev_err(codec->dev, "Failed to read device revision: %d\n",
 648                         ret);
 649                 goto err_reg_enable;
 650         }
 651         dev_info(codec->dev, "revision %c\n", ret + 'A');
 652
 653         ret = wm8804_reset(codec);
 654         if (ret < 0) {
 655                 dev_err(codec->dev, "Failed to issue reset: %d\n", ret);
 656                 goto err_reg_enable;
 657         }
 658
 659         wm8804_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 660
 661         snd_soc_add_controls(codec, wm8804_snd_controls,
 662                              ARRAY_SIZE(wm8804_snd_controls));
 663         return 0;
 664
 665 err_reg_enable:
 666         regulator_bulk_disable(ARRAY_SIZE(wm8804->supplies), wm8804->supplies);
 667 err_reg_get:
 668         regulator_bulk_free(ARRAY_SIZE(wm8804->supplies), wm8804->supplies);
 669         return ret;
 670 }
 671
 672 static struct snd_soc_dai_ops wm8804_dai_ops = {
 673         .hw_params = wm8804_hw_params,
 674         .set_fmt = wm8804_set_fmt,
 675         .set_sysclk = wm8804_set_sysclk,
 676         .set_clkdiv = wm8804_set_clkdiv,
 677         .set_pll = wm8804_set_pll
 678 };
 679
 680 #define WM8804_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE | \
 681                         SNDRV_PCM_FMTBIT_S24_LE)
 682
 683 static struct snd_soc_dai_driver wm8804_dai = {
 684         .name = "wm8804-spdif",
 685         .playback = {
 686                 .stream_name = "Playback",
 687                 .channels_min = 2,
 688                 .channels_max = 2,
 689                 .rates = SNDRV_PCM_RATE_8000_192000,
 690                 .formats = WM8804_FORMATS,
 691         },
 692         .capture = {
 693                 .stream_name = "Capture",
 694                 .channels_min = 2,
 695                 .channels_max = 2,
 696                 .rates = SNDRV_PCM_RATE_8000_192000,
 697                 .formats = WM8804_FORMATS,
 698         },
 699         .ops = &wm8804_dai_ops,
 700         .symmetric_rates = 1
 701 };
 702
 703 static struct snd_soc_codec_driver soc_codec_dev_wm8804 = {
 704         .probe = wm8804_probe,
 705         .remove = wm8804_remove,
 706         .suspend = wm8804_suspend,
 707         .resume = wm8804_resume,
 708         .set_bias_level = wm8804_set_bias_level,
 709         .reg_cache_size = ARRAY_SIZE(wm8804_reg_defs),
 710         .reg_word_size = sizeof(u8),
 711         .reg_cache_default = wm8804_reg_defs,
 712         .volatile_register = wm8804_volatile
 713 };
 714
 715 #if defined(CONFIG_SPI_MASTER)
 716 static int __devinit wm8804_spi_probe(struct spi_device *spi)
 717 {
 718         struct wm8804_priv *wm8804;
 719         int ret;
 720
 721         wm8804 = kzalloc(sizeof *wm8804, GFP_KERNEL);
 722         if (!wm8804)
 723                 return -ENOMEM;
 724
 725         wm8804->control_type = SND_SOC_SPI;
 726         spi_set_drvdata(spi, wm8804);
 727
 728         ret = snd_soc_register_codec(&spi->dev,
 729                                      &soc_codec_dev_wm8804, &wm8804_dai, 1);
 730         if (ret < 0)
 731                 kfree(wm8804);
 732         return ret;
 733 }
 734
 735 static int __devexit wm8804_spi_remove(struct spi_device *spi)
 736 {
 737         snd_soc_unregister_codec(&spi->dev);
 738         kfree(spi_get_drvdata(spi));
 739         return 0;
 740 }
 741
 742 static struct spi_driver wm8804_spi_driver = {
 743         .driver = {
 744                 .name = "wm8804",
 745                 .owner = THIS_MODULE,
 746         },
 747         .probe = wm8804_spi_probe,
 748         .remove = __devexit_p(wm8804_spi_remove)
 749 };
 750 #endif
 751
 752 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 753 static __devinit int wm8804_i2c_probe(struct i2c_client *i2c,
 754                                       const struct i2c_device_id *id)
 755 {
 756         struct wm8804_priv *wm8804;
 757         int ret;
 758
 759         wm8804 = kzalloc(sizeof *wm8804, GFP_KERNEL);
 760         if (!wm8804)
 761                 return -ENOMEM;
 762
 763         wm8804->control_type = SND_SOC_I2C;
 764         i2c_set_clientdata(i2c, wm8804);
 765
 766         ret = snd_soc_register_codec(&i2c->dev,
 767                                      &soc_codec_dev_wm8804, &wm8804_dai, 1);
 768         if (ret < 0)
 769                 kfree(wm8804);
 770         return ret;
 771 }
 772
 773 static __devexit int wm8804_i2c_remove(struct i2c_client *client)
 774 {
 775         snd_soc_unregister_codec(&client->dev);
 776         kfree(i2c_get_clientdata(client));
 777         return 0;
 778 }
 779
 780 static const struct i2c_device_id wm8804_i2c_id[] = {
 781         { "wm8804", 0 },
 782         { }
 783 };
 784 MODULE_DEVICE_TABLE(i2c, wm8804_i2c_id);
 785
 786 static struct i2c_driver wm8804_i2c_driver = {
 787         .driver = {
 788                 .name = "wm8804",
 789                 .owner = THIS_MODULE,
 790         },
 791         .probe = wm8804_i2c_probe,
 792         .remove = __devexit_p(wm8804_i2c_remove),
 793         .id_table = wm8804_i2c_id
 794 };
 795 #endif
 796
 797 static int __init wm8804_modinit(void)
 798 {
 799         int ret = 0;
 800
 801 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 802         ret = i2c_add_driver(&wm8804_i2c_driver);
 803         if (ret) {
 804                 printk(KERN_ERR "Failed to register wm8804 I2C driver: %d\n",
 805                        ret);
 806         }
 807 #endif
 808 #if defined(CONFIG_SPI_MASTER)
 809         ret = spi_register_driver(&wm8804_spi_driver);
 810         if (ret != 0) {
 811                 printk(KERN_ERR "Failed to register wm8804 SPI driver: %d\n",
 812                        ret);
 813         }
 814 #endif
 815         return ret;
 816 }
 817 module_init(wm8804_modinit);
 818
 819 static void __exit wm8804_exit(void)
 820 {
 821 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 822         i2c_del_driver(&wm8804_i2c_driver);
 823 #endif
 824 #if defined(CONFIG_SPI_MASTER)
 825         spi_unregister_driver(&wm8804_spi_driver);
 826 #endif
 827 }
 828 module_exit(wm8804_exit);
 829
 830 MODULE_DESCRIPTION("ASoC WM8804 driver");
 831 MODULE_AUTHOR("Dimitris Papastamos <dp@opensource.wolfsonmicro.com>");
 832 MODULE_LICENSE("GPL");