sound/soc/codecs/wm8731.c

   1 /*
   2  * wm8731.c  --  WM8731 ALSA SoC Audio driver
   3  *
   4  * Copyright 2005 Openedhand Ltd.
   5  *
   6  * Author: Richard Purdie <richard@openedhand.com>
   7  *
   8  * Based on wm8753.c by Liam Girdwood
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/moduleparam.h>
  17 #include <linux/init.h>
  18 #include <linux/delay.h>
  19 #include <linux/pm.h>
  20 #include <linux/i2c.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/regulator/consumer.h>
  23 #include <linux/spi/spi.h>
  24 #include <sound/core.h>
  25 #include <sound/pcm.h>
  26 #include <sound/pcm_params.h>
  27 #include <sound/soc.h>
  28 #include <sound/soc-dapm.h>
  29 #include <sound/initval.h>
  30 #include <sound/tlv.h>
  31
  32 #include "wm8731.h"
  33
  34 static struct snd_soc_codec *wm8731_codec;
  35 struct snd_soc_codec_device soc_codec_dev_wm8731;
  36
  37 #define WM8731_NUM_SUPPLIES 4
  38 static const char *wm8731_supply_names[WM8731_NUM_SUPPLIES] = {
  39         "AVDD",
  40         "HPVDD",
  41         "DCVDD",
  42         "DBVDD",
  43 };
  44
  45 /* codec private data */
  46 struct wm8731_priv {
  47         struct snd_soc_codec codec;
  48         struct regulator_bulk_data supplies[WM8731_NUM_SUPPLIES];
  49         u16 reg_cache[WM8731_CACHEREGNUM];
  50         unsigned int sysclk;
  51 };
  52
  53
  54 /*
  55  * wm8731 register cache
  56  * We can't read the WM8731 register space when we are
  57  * using 2 wire for device control, so we cache them instead.
  58  * There is no point in caching the reset register
  59  */
  60 static const u16 wm8731_reg[WM8731_CACHEREGNUM] = {
  61         0x0097, 0x0097, 0x0079, 0x0079,
  62         0x000a, 0x0008, 0x009f, 0x000a,
  63         0x0000, 0x0000
  64 };
  65
  66 #define wm8731_reset(c) snd_soc_write(c, WM8731_RESET, 0)
  67
  68 static const char *wm8731_input_select[] = {"Line In", "Mic"};
  69 static const char *wm8731_deemph[] = {"None", "32Khz", "44.1Khz", "48Khz"};
  70
  71 static const struct soc_enum wm8731_enum[] = {
  72         SOC_ENUM_SINGLE(WM8731_APANA, 2, 2, wm8731_input_select),
  73         SOC_ENUM_SINGLE(WM8731_APDIGI, 1, 4, wm8731_deemph),
  74 };
  75
  76 static const DECLARE_TLV_DB_SCALE(in_tlv, -3450, 150, 0);
  77 static const DECLARE_TLV_DB_SCALE(sidetone_tlv, -1500, 300, 0);
  78 static const DECLARE_TLV_DB_SCALE(out_tlv, -12100, 100, 1);
  79
  80 static const struct snd_kcontrol_new wm8731_snd_controls[] = {
  81
  82 SOC_DOUBLE_R_TLV("Master Playback Volume", WM8731_LOUT1V, WM8731_ROUT1V,
  83                  0, 127, 0, out_tlv),
  84 SOC_DOUBLE_R("Master Playback ZC Switch", WM8731_LOUT1V, WM8731_ROUT1V,
  85         7, 1, 0),
  86
  87 SOC_DOUBLE_R_TLV("Capture Volume", WM8731_LINVOL, WM8731_RINVOL, 0, 31, 0,
  88                  in_tlv),
  89 SOC_DOUBLE_R("Line Capture Switch", WM8731_LINVOL, WM8731_RINVOL, 7, 1, 1),
  90
  91 SOC_SINGLE("Mic Boost (+20dB)", WM8731_APANA, 0, 1, 0),
  92 SOC_SINGLE("Mic Capture Switch", WM8731_APANA, 1, 1, 1),
  93
  94 SOC_SINGLE_TLV("Sidetone Playback Volume", WM8731_APANA, 6, 3, 1,
  95                sidetone_tlv),
  96
  97 SOC_SINGLE("ADC High Pass Filter Switch", WM8731_APDIGI, 0, 1, 1),
  98 SOC_SINGLE("Store DC Offset Switch", WM8731_APDIGI, 4, 1, 0),
  99
 100 SOC_ENUM("Playback De-emphasis", wm8731_enum[1]),
 101 };
 102
 103 /* Output Mixer */
 104 static const struct snd_kcontrol_new wm8731_output_mixer_controls[] = {
 105 SOC_DAPM_SINGLE("Line Bypass Switch", WM8731_APANA, 3, 1, 0),
 106 SOC_DAPM_SINGLE("Mic Sidetone Switch", WM8731_APANA, 5, 1, 0),
 107 SOC_DAPM_SINGLE("HiFi Playback Switch", WM8731_APANA, 4, 1, 0),
 108 };
 109
 110 /* Input mux */
 111 static const struct snd_kcontrol_new wm8731_input_mux_controls =
 112 SOC_DAPM_ENUM("Input Select", wm8731_enum[0]);
 113
 114 static const struct snd_soc_dapm_widget wm8731_dapm_widgets[] = {
 115 SND_SOC_DAPM_MIXER("Output Mixer", WM8731_PWR, 4, 1,
 116         &wm8731_output_mixer_controls[0],
 117         ARRAY_SIZE(wm8731_output_mixer_controls)),
 118 SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8731_PWR, 3, 1),
 119 SND_SOC_DAPM_OUTPUT("LOUT"),
 120 SND_SOC_DAPM_OUTPUT("LHPOUT"),
 121 SND_SOC_DAPM_OUTPUT("ROUT"),
 122 SND_SOC_DAPM_OUTPUT("RHPOUT"),
 123 SND_SOC_DAPM_ADC("ADC", "HiFi Capture", WM8731_PWR, 2, 1),
 124 SND_SOC_DAPM_MUX("Input Mux", SND_SOC_NOPM, 0, 0, &wm8731_input_mux_controls),
 125 SND_SOC_DAPM_PGA("Line Input", WM8731_PWR, 0, 1, NULL, 0),
 126 SND_SOC_DAPM_MICBIAS("Mic Bias", WM8731_PWR, 1, 1),
 127 SND_SOC_DAPM_INPUT("MICIN"),
 128 SND_SOC_DAPM_INPUT("RLINEIN"),
 129 SND_SOC_DAPM_INPUT("LLINEIN"),
 130 };
 131
 132 static const struct snd_soc_dapm_route intercon[] = {
 133         /* output mixer */
 134         {"Output Mixer", "Line Bypass Switch", "Line Input"},
 135         {"Output Mixer", "HiFi Playback Switch", "DAC"},
 136         {"Output Mixer", "Mic Sidetone Switch", "Mic Bias"},
 137
 138         /* outputs */
 139         {"RHPOUT", NULL, "Output Mixer"},
 140         {"ROUT", NULL, "Output Mixer"},
 141         {"LHPOUT", NULL, "Output Mixer"},
 142         {"LOUT", NULL, "Output Mixer"},
 143
 144         /* input mux */
 145         {"Input Mux", "Line In", "Line Input"},
 146         {"Input Mux", "Mic", "Mic Bias"},
 147         {"ADC", NULL, "Input Mux"},
 148
 149         /* inputs */
 150         {"Line Input", NULL, "LLINEIN"},
 151         {"Line Input", NULL, "RLINEIN"},
 152         {"Mic Bias", NULL, "MICIN"},
 153 };
 154
 155 static int wm8731_add_widgets(struct snd_soc_codec *codec)
 156 {
 157         snd_soc_dapm_new_controls(codec, wm8731_dapm_widgets,
 158                                   ARRAY_SIZE(wm8731_dapm_widgets));
 159
 160         snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));
 161
 162         snd_soc_dapm_new_widgets(codec);
 163         return 0;
 164 }
 165
 166 struct _coeff_div {
 167         u32 mclk;
 168         u32 rate;
 169         u16 fs;
 170         u8 sr:4;
 171         u8 bosr:1;
 172         u8 usb:1;
 173 };
 174
 175 /* codec mclk clock divider coefficients */
 176 static const struct _coeff_div coeff_div[] = {
 177         /* 48k */
 178         {12288000, 48000, 256, 0x0, 0x0, 0x0},
 179         {18432000, 48000, 384, 0x0, 0x1, 0x0},
 180         {12000000, 48000, 250, 0x0, 0x0, 0x1},
 181
 182         /* 32k */
 183         {12288000, 32000, 384, 0x6, 0x0, 0x0},
 184         {18432000, 32000, 576, 0x6, 0x1, 0x0},
 185         {12000000, 32000, 375, 0x6, 0x0, 0x1},
 186
 187         /* 8k */
 188         {12288000, 8000, 1536, 0x3, 0x0, 0x0},
 189         {18432000, 8000, 2304, 0x3, 0x1, 0x0},
 190         {11289600, 8000, 1408, 0xb, 0x0, 0x0},
 191         {16934400, 8000, 2112, 0xb, 0x1, 0x0},
 192         {12000000, 8000, 1500, 0x3, 0x0, 0x1},
 193
 194         /* 96k */
 195         {12288000, 96000, 128, 0x7, 0x0, 0x0},
 196         {18432000, 96000, 192, 0x7, 0x1, 0x0},
 197         {12000000, 96000, 125, 0x7, 0x0, 0x1},
 198
 199         /* 44.1k */
 200         {11289600, 44100, 256, 0x8, 0x0, 0x0},
 201         {16934400, 44100, 384, 0x8, 0x1, 0x0},
 202         {12000000, 44100, 272, 0x8, 0x1, 0x1},
 203
 204         /* 88.2k */
 205         {11289600, 88200, 128, 0xf, 0x0, 0x0},
 206         {16934400, 88200, 192, 0xf, 0x1, 0x0},
 207         {12000000, 88200, 136, 0xf, 0x1, 0x1},
 208 };
 209
 210 static inline int get_coeff(int mclk, int rate)
 211 {
 212         int i;
 213
 214         for (i = 0; i < ARRAY_SIZE(coeff_div); i++) {
 215                 if (coeff_div[i].rate == rate && coeff_div[i].mclk == mclk)
 216                         return i;
 217         }
 218         return 0;
 219 }
 220
 221 static int wm8731_hw_params(struct snd_pcm_substream *substream,
 222                             struct snd_pcm_hw_params *params,
 223                             struct snd_soc_dai *dai)
 224 {
 225         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 226         struct snd_soc_device *socdev = rtd->socdev;
 227         struct snd_soc_codec *codec = socdev->card->codec;
 228         struct wm8731_priv *wm8731 = codec->private_data;
 229         u16 iface = snd_soc_read(codec, WM8731_IFACE) & 0xfff3;
 230         int i = get_coeff(wm8731->sysclk, params_rate(params));
 231         u16 srate = (coeff_div[i].sr << 2) |
 232                 (coeff_div[i].bosr << 1) | coeff_div[i].usb;
 233
 234         snd_soc_write(codec, WM8731_SRATE, srate);
 235
 236         /* bit size */
 237         switch (params_format(params)) {
 238         case SNDRV_PCM_FORMAT_S16_LE:
 239                 break;
 240         case SNDRV_PCM_FORMAT_S20_3LE:
 241                 iface |= 0x0004;
 242                 break;
 243         case SNDRV_PCM_FORMAT_S24_LE:
 244                 iface |= 0x0008;
 245                 break;
 246         }
 247
 248         snd_soc_write(codec, WM8731_IFACE, iface);
 249         return 0;
 250 }
 251
 252 static int wm8731_pcm_prepare(struct snd_pcm_substream *substream,
 253                               struct snd_soc_dai *dai)
 254 {
 255         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 256         struct snd_soc_device *socdev = rtd->socdev;
 257         struct snd_soc_codec *codec = socdev->card->codec;
 258
 259         /* set active */
 260         snd_soc_write(codec, WM8731_ACTIVE, 0x0001);
 261
 262         return 0;
 263 }
 264
 265 static void wm8731_shutdown(struct snd_pcm_substream *substream,
 266                             struct snd_soc_dai *dai)
 267 {
 268         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 269         struct snd_soc_device *socdev = rtd->socdev;
 270         struct snd_soc_codec *codec = socdev->card->codec;
 271
 272         /* deactivate */
 273         if (!codec->active) {
 274                 udelay(50);
 275                 snd_soc_write(codec, WM8731_ACTIVE, 0x0);
 276         }
 277 }
 278
 279 static int wm8731_mute(struct snd_soc_dai *dai, int mute)
 280 {
 281         struct snd_soc_codec *codec = dai->codec;
 282         u16 mute_reg = snd_soc_read(codec, WM8731_APDIGI) & 0xfff7;
 283
 284         if (mute)
 285                 snd_soc_write(codec, WM8731_APDIGI, mute_reg | 0x8);
 286         else
 287                 snd_soc_write(codec, WM8731_APDIGI, mute_reg);
 288         return 0;
 289 }
 290
 291 static int wm8731_set_dai_sysclk(struct snd_soc_dai *codec_dai,
 292                 int clk_id, unsigned int freq, int dir)
 293 {
 294         struct snd_soc_codec *codec = codec_dai->codec;
 295         struct wm8731_priv *wm8731 = codec->private_data;
 296
 297         switch (freq) {
 298         case 11289600:
 299         case 12000000:
 300         case 12288000:
 301         case 16934400:
 302         case 18432000:
 303                 wm8731->sysclk = freq;
 304                 return 0;
 305         }
 306         return -EINVAL;
 307 }
 308
 309
 310 static int wm8731_set_dai_fmt(struct snd_soc_dai *codec_dai,
 311                 unsigned int fmt)
 312 {
 313         struct snd_soc_codec *codec = codec_dai->codec;
 314         u16 iface = 0;
 315
 316         /* set master/slave audio interface */
 317         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 318         case SND_SOC_DAIFMT_CBM_CFM:
 319                 iface |= 0x0040;
 320                 break;
 321         case SND_SOC_DAIFMT_CBS_CFS:
 322                 break;
 323         default:
 324                 return -EINVAL;
 325         }
 326
 327         /* interface format */
 328         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 329         case SND_SOC_DAIFMT_I2S:
 330                 iface |= 0x0002;
 331                 break;
 332         case SND_SOC_DAIFMT_RIGHT_J:
 333                 break;
 334         case SND_SOC_DAIFMT_LEFT_J:
 335                 iface |= 0x0001;
 336                 break;
 337         case SND_SOC_DAIFMT_DSP_A:
 338                 iface |= 0x0003;
 339                 break;
 340         case SND_SOC_DAIFMT_DSP_B:
 341                 iface |= 0x0013;
 342                 break;
 343         default:
 344                 return -EINVAL;
 345         }
 346
 347         /* clock inversion */
 348         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 349         case SND_SOC_DAIFMT_NB_NF:
 350                 break;
 351         case SND_SOC_DAIFMT_IB_IF:
 352                 iface |= 0x0090;
 353                 break;
 354         case SND_SOC_DAIFMT_IB_NF:
 355                 iface |= 0x0080;
 356                 break;
 357         case SND_SOC_DAIFMT_NB_IF:
 358                 iface |= 0x0010;
 359                 break;
 360         default:
 361                 return -EINVAL;
 362         }
 363
 364         /* set iface */
 365         snd_soc_write(codec, WM8731_IFACE, iface);
 366         return 0;
 367 }
 368
 369 static int wm8731_set_bias_level(struct snd_soc_codec *codec,
 370                                  enum snd_soc_bias_level level)
 371 {
 372         u16 reg;
 373
 374         switch (level) {
 375         case SND_SOC_BIAS_ON:
 376                 break;
 377         case SND_SOC_BIAS_PREPARE:
 378                 break;
 379         case SND_SOC_BIAS_STANDBY:
 380                 /* Clear PWROFF, gate CLKOUT, everything else as-is */
 381                 reg = snd_soc_read(codec, WM8731_PWR) & 0xff7f;
 382                 snd_soc_write(codec, WM8731_PWR, reg | 0x0040);
 383                 break;
 384         case SND_SOC_BIAS_OFF:
 385                 snd_soc_write(codec, WM8731_ACTIVE, 0x0);
 386                 snd_soc_write(codec, WM8731_PWR, 0xffff);
 387                 break;
 388         }
 389         codec->bias_level = level;
 390         return 0;
 391 }
 392
 393 #define WM8731_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
 394                 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 |\
 395                 SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\
 396                 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |\
 397                 SNDRV_PCM_RATE_96000)
 398
 399 #define WM8731_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
 400         SNDRV_PCM_FMTBIT_S24_LE)
 401
 402 static struct snd_soc_dai_ops wm8731_dai_ops = {
 403         .prepare        = wm8731_pcm_prepare,
 404         .hw_params      = wm8731_hw_params,
 405         .shutdown       = wm8731_shutdown,
 406         .digital_mute   = wm8731_mute,
 407         .set_sysclk     = wm8731_set_dai_sysclk,
 408         .set_fmt        = wm8731_set_dai_fmt,
 409 };
 410
 411 struct snd_soc_dai wm8731_dai = {
 412         .name = "WM8731",
 413         .playback = {
 414                 .stream_name = "Playback",
 415                 .channels_min = 1,
 416                 .channels_max = 2,
 417                 .rates = WM8731_RATES,
 418                 .formats = WM8731_FORMATS,},
 419         .capture = {
 420                 .stream_name = "Capture",
 421                 .channels_min = 1,
 422                 .channels_max = 2,
 423                 .rates = WM8731_RATES,
 424                 .formats = WM8731_FORMATS,},
 425         .ops = &wm8731_dai_ops,
 426         .symmetric_rates = 1,
 427 };
 428 EXPORT_SYMBOL_GPL(wm8731_dai);
 429
 430 #ifdef CONFIG_PM
 431 static int wm8731_suspend(struct platform_device *pdev, pm_message_t state)
 432 {
 433         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 434         struct snd_soc_codec *codec = socdev->card->codec;
 435         struct wm8731_priv *wm8731 = codec->private_data;
 436
 437         snd_soc_write(codec, WM8731_ACTIVE, 0x0);
 438         wm8731_set_bias_level(codec, SND_SOC_BIAS_OFF);
 439         regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies),
 440                                wm8731->supplies);
 441         return 0;
 442 }
 443
 444 static int wm8731_resume(struct platform_device *pdev)
 445 {
 446         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 447         struct snd_soc_codec *codec = socdev->card->codec;
 448         struct wm8731_priv *wm8731 = codec->private_data;
 449         int i, ret;
 450         u8 data[2];
 451         u16 *cache = codec->reg_cache;
 452
 453         ret = regulator_bulk_enable(ARRAY_SIZE(wm8731->supplies),
 454                                     wm8731->supplies);
 455         if (ret != 0)
 456                 return ret;
 457
 458         /* Sync reg_cache with the hardware */
 459         for (i = 0; i < ARRAY_SIZE(wm8731_reg); i++) {
 460                 data[0] = (i << 1) | ((cache[i] >> 8) & 0x0001);
 461                 data[1] = cache[i] & 0x00ff;
 462                 codec->hw_write(codec->control_data, data, 2);
 463         }
 464         wm8731_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 465         wm8731_set_bias_level(codec, codec->suspend_bias_level);
 466
 467         return 0;
 468 }
 469 #else
 470 #define wm8731_suspend NULL
 471 #define wm8731_resume NULL
 472 #endif
 473
 474 static int wm8731_probe(struct platform_device *pdev)
 475 {
 476         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 477         struct snd_soc_codec *codec;
 478         int ret = 0;
 479
 480         if (wm8731_codec == NULL) {
 481                 dev_err(&pdev->dev, "Codec device not registered\n");
 482                 return -ENODEV;
 483         }
 484
 485         socdev->card->codec = wm8731_codec;
 486         codec = wm8731_codec;
 487
 488         /* register pcms */
 489         ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
 490         if (ret < 0) {
 491                 dev_err(codec->dev, "failed to create pcms: %d\n", ret);
 492                 goto pcm_err;
 493         }
 494
 495         snd_soc_add_controls(codec, wm8731_snd_controls,
 496                              ARRAY_SIZE(wm8731_snd_controls));
 497         wm8731_add_widgets(codec);
 498         ret = snd_soc_init_card(socdev);
 499         if (ret < 0) {
 500                 dev_err(codec->dev, "failed to register card: %d\n", ret);
 501                 goto card_err;
 502         }
 503
 504         return ret;
 505
 506 card_err:
 507         snd_soc_free_pcms(socdev);
 508         snd_soc_dapm_free(socdev);
 509 pcm_err:
 510         return ret;
 511 }
 512
 513 /* power down chip */
 514 static int wm8731_remove(struct platform_device *pdev)
 515 {
 516         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 517
 518         snd_soc_free_pcms(socdev);
 519         snd_soc_dapm_free(socdev);
 520
 521         return 0;
 522 }
 523
 524 struct snd_soc_codec_device soc_codec_dev_wm8731 = {
 525         .probe =        wm8731_probe,
 526         .remove =       wm8731_remove,
 527         .suspend =      wm8731_suspend,
 528         .resume =       wm8731_resume,
 529 };
 530 EXPORT_SYMBOL_GPL(soc_codec_dev_wm8731);
 531
 532 static int wm8731_register(struct wm8731_priv *wm8731,
 533                            enum snd_soc_control_type control)
 534 {
 535         int ret, i;
 536         struct snd_soc_codec *codec = &wm8731->codec;
 537
 538         if (wm8731_codec) {
 539                 dev_err(codec->dev, "Another WM8731 is registered\n");
 540                 ret = -EINVAL;
 541                 goto err;
 542         }
 543
 544         mutex_init(&codec->mutex);
 545         INIT_LIST_HEAD(&codec->dapm_widgets);
 546         INIT_LIST_HEAD(&codec->dapm_paths);
 547
 548         codec->private_data = wm8731;
 549         codec->name = "WM8731";
 550         codec->owner = THIS_MODULE;
 551         codec->bias_level = SND_SOC_BIAS_OFF;
 552         codec->set_bias_level = wm8731_set_bias_level;
 553         codec->dai = &wm8731_dai;
 554         codec->num_dai = 1;
 555         codec->reg_cache_size = WM8731_CACHEREGNUM;
 556         codec->reg_cache = &wm8731->reg_cache;
 557
 558         memcpy(codec->reg_cache, wm8731_reg, sizeof(wm8731_reg));
 559
 560         ret = snd_soc_codec_set_cache_io(codec, 7, 9, control);
 561         if (ret < 0) {
 562                 dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
 563                 goto err;
 564         }
 565
 566         for (i = 0; i < ARRAY_SIZE(wm8731->supplies); i++)
 567                 wm8731->supplies[i].supply = wm8731_supply_names[i];
 568
 569         ret = regulator_bulk_get(codec->dev, ARRAY_SIZE(wm8731->supplies),
 570                                  wm8731->supplies);
 571         if (ret != 0) {
 572                 dev_err(codec->dev, "Failed to request supplies: %d\n", ret);
 573                 goto err;
 574         }
 575
 576         ret = regulator_bulk_enable(ARRAY_SIZE(wm8731->supplies),
 577                                     wm8731->supplies);
 578         if (ret != 0) {
 579                 dev_err(codec->dev, "Failed to enable supplies: %d\n", ret);
 580                 goto err_regulator_get;
 581         }
 582
 583         ret = wm8731_reset(codec);
 584         if (ret < 0) {
 585                 dev_err(codec->dev, "Failed to issue reset: %d\n", ret);
 586                 goto err_regulator_enable;
 587         }
 588
 589         wm8731_dai.dev = codec->dev;
 590
 591         wm8731_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 592
 593         /* Latch the update bits */
 594         snd_soc_update_bits(codec, WM8731_LOUT1V, 0x100, 0);
 595         snd_soc_update_bits(codec, WM8731_ROUT1V, 0x100, 0);
 596         snd_soc_update_bits(codec, WM8731_LINVOL, 0x100, 0);
 597         snd_soc_update_bits(codec, WM8731_RINVOL, 0x100, 0);
 598
 599         /* Disable bypass path by default */
 600         snd_soc_update_bits(codec, WM8731_APANA, 0x4, 0);
 601
 602         wm8731_codec = codec;
 603
 604         ret = snd_soc_register_codec(codec);
 605         if (ret != 0) {
 606                 dev_err(codec->dev, "Failed to register codec: %d\n", ret);
 607                 goto err_regulator_enable;
 608         }
 609
 610         ret = snd_soc_register_dai(&wm8731_dai);
 611         if (ret != 0) {
 612                 dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
 613                 snd_soc_unregister_codec(codec);
 614                 goto err_codec;
 615         }
 616
 617         return 0;
 618
 619 err_codec:
 620         snd_soc_unregister_codec(codec);
 621 err_regulator_enable:
 622         regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);
 623 err_regulator_get:
 624         regulator_bulk_free(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);
 625 err:
 626         kfree(wm8731);
 627         return ret;
 628 }
 629
 630 static void wm8731_unregister(struct wm8731_priv *wm8731)
 631 {
 632         wm8731_set_bias_level(&wm8731->codec, SND_SOC_BIAS_OFF);
 633         snd_soc_unregister_dai(&wm8731_dai);
 634         snd_soc_unregister_codec(&wm8731->codec);
 635         regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);
 636         regulator_bulk_free(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);
 637         kfree(wm8731);
 638         wm8731_codec = NULL;
 639 }
 640
 641 #if defined(CONFIG_SPI_MASTER)
 642 static int __devinit wm8731_spi_probe(struct spi_device *spi)
 643 {
 644         struct snd_soc_codec *codec;
 645         struct wm8731_priv *wm8731;
 646
 647         wm8731 = kzalloc(sizeof(struct wm8731_priv), GFP_KERNEL);
 648         if (wm8731 == NULL)
 649                 return -ENOMEM;
 650
 651         codec = &wm8731->codec;
 652         codec->control_data = spi;
 653         codec->dev = &spi->dev;
 654
 655         dev_set_drvdata(&spi->dev, wm8731);
 656
 657         return wm8731_register(wm8731, SND_SOC_SPI);
 658 }
 659
 660 static int __devexit wm8731_spi_remove(struct spi_device *spi)
 661 {
 662         struct wm8731_priv *wm8731 = dev_get_drvdata(&spi->dev);
 663
 664         wm8731_unregister(wm8731);
 665
 666         return 0;
 667 }
 668
 669 static struct spi_driver wm8731_spi_driver = {
 670         .driver = {
 671                 .name   = "wm8731",
 672                 .bus    = &spi_bus_type,
 673                 .owner  = THIS_MODULE,
 674         },
 675         .probe          = wm8731_spi_probe,
 676         .remove         = __devexit_p(wm8731_spi_remove),
 677 };
 678 #endif /* CONFIG_SPI_MASTER */
 679
 680 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 681 static __devinit int wm8731_i2c_probe(struct i2c_client *i2c,
 682                                       const struct i2c_device_id *id)
 683 {
 684         struct wm8731_priv *wm8731;
 685         struct snd_soc_codec *codec;
 686
 687         wm8731 = kzalloc(sizeof(struct wm8731_priv), GFP_KERNEL);
 688         if (wm8731 == NULL)
 689                 return -ENOMEM;
 690
 691         codec = &wm8731->codec;
 692
 693         i2c_set_clientdata(i2c, wm8731);
 694         codec->control_data = i2c;
 695
 696         codec->dev = &i2c->dev;
 697
 698         return wm8731_register(wm8731, SND_SOC_I2C);
 699 }
 700
 701 static __devexit int wm8731_i2c_remove(struct i2c_client *client)
 702 {
 703         struct wm8731_priv *wm8731 = i2c_get_clientdata(client);
 704         wm8731_unregister(wm8731);
 705         return 0;
 706 }
 707
 708 static const struct i2c_device_id wm8731_i2c_id[] = {
 709         { "wm8731", 0 },
 710         { }
 711 };
 712 MODULE_DEVICE_TABLE(i2c, wm8731_i2c_id);
 713
 714 static struct i2c_driver wm8731_i2c_driver = {
 715         .driver = {
 716                 .name = "WM8731 I2C Codec",
 717                 .owner = THIS_MODULE,
 718         },
 719         .probe =    wm8731_i2c_probe,
 720         .remove =   __devexit_p(wm8731_i2c_remove),
 721         .id_table = wm8731_i2c_id,
 722 };
 723 #endif
 724
 725 static int __init wm8731_modinit(void)
 726 {
 727         int ret;
 728 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 729         ret = i2c_add_driver(&wm8731_i2c_driver);
 730         if (ret != 0) {
 731                 printk(KERN_ERR "Failed to register WM8731 I2C driver: %d\n",
 732                        ret);
 733         }
 734 #endif
 735 #if defined(CONFIG_SPI_MASTER)
 736         ret = spi_register_driver(&wm8731_spi_driver);
 737         if (ret != 0) {
 738                 printk(KERN_ERR "Failed to register WM8731 SPI driver: %d\n",
 739                        ret);
 740         }
 741 #endif
 742         return 0;
 743 }
 744 module_init(wm8731_modinit);
 745
 746 static void __exit wm8731_exit(void)
 747 {
 748 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 749         i2c_del_driver(&wm8731_i2c_driver);
 750 #endif
 751 #if defined(CONFIG_SPI_MASTER)
 752         spi_unregister_driver(&wm8731_spi_driver);
 753 #endif
 754 }
 755 module_exit(wm8731_exit);
 756
 757 MODULE_DESCRIPTION("ASoC WM8731 driver");
 758 MODULE_AUTHOR("Richard Purdie");
 759 MODULE_LICENSE("GPL");