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         return 0;
 163 }
 164
 165 struct _coeff_div {
 166         u32 mclk;
 167         u32 rate;
 168         u16 fs;
 169         u8 sr:4;
 170         u8 bosr:1;
 171         u8 usb:1;
 172 };
 173
 174 /* codec mclk clock divider coefficients */
 175 static const struct _coeff_div coeff_div[] = {
 176         /* 48k */
 177         {12288000, 48000, 256, 0x0, 0x0, 0x0},
 178         {18432000, 48000, 384, 0x0, 0x1, 0x0},
 179         {12000000, 48000, 250, 0x0, 0x0, 0x1},
 180
 181         /* 32k */
 182         {12288000, 32000, 384, 0x6, 0x0, 0x0},
 183         {18432000, 32000, 576, 0x6, 0x1, 0x0},
 184         {12000000, 32000, 375, 0x6, 0x0, 0x1},
 185
 186         /* 8k */
 187         {12288000, 8000, 1536, 0x3, 0x0, 0x0},
 188         {18432000, 8000, 2304, 0x3, 0x1, 0x0},
 189         {11289600, 8000, 1408, 0xb, 0x0, 0x0},
 190         {16934400, 8000, 2112, 0xb, 0x1, 0x0},
 191         {12000000, 8000, 1500, 0x3, 0x0, 0x1},
 192
 193         /* 96k */
 194         {12288000, 96000, 128, 0x7, 0x0, 0x0},
 195         {18432000, 96000, 192, 0x7, 0x1, 0x0},
 196         {12000000, 96000, 125, 0x7, 0x0, 0x1},
 197
 198         /* 44.1k */
 199         {11289600, 44100, 256, 0x8, 0x0, 0x0},
 200         {16934400, 44100, 384, 0x8, 0x1, 0x0},
 201         {12000000, 44100, 272, 0x8, 0x1, 0x1},
 202
 203         /* 88.2k */
 204         {11289600, 88200, 128, 0xf, 0x0, 0x0},
 205         {16934400, 88200, 192, 0xf, 0x1, 0x0},
 206         {12000000, 88200, 136, 0xf, 0x1, 0x1},
 207 };
 208
 209 static inline int get_coeff(int mclk, int rate)
 210 {
 211         int i;
 212
 213         for (i = 0; i < ARRAY_SIZE(coeff_div); i++) {
 214                 if (coeff_div[i].rate == rate && coeff_div[i].mclk == mclk)
 215                         return i;
 216         }
 217         return 0;
 218 }
 219
 220 static int wm8731_hw_params(struct snd_pcm_substream *substream,
 221                             struct snd_pcm_hw_params *params,
 222                             struct snd_soc_dai *dai)
 223 {
 224         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 225         struct snd_soc_device *socdev = rtd->socdev;
 226         struct snd_soc_codec *codec = socdev->card->codec;
 227         struct wm8731_priv *wm8731 = codec->private_data;
 228         u16 iface = snd_soc_read(codec, WM8731_IFACE) & 0xfff3;
 229         int i = get_coeff(wm8731->sysclk, params_rate(params));
 230         u16 srate = (coeff_div[i].sr << 2) |
 231                 (coeff_div[i].bosr << 1) | coeff_div[i].usb;
 232
 233         snd_soc_write(codec, WM8731_SRATE, srate);
 234
 235         /* bit size */
 236         switch (params_format(params)) {
 237         case SNDRV_PCM_FORMAT_S16_LE:
 238                 break;
 239         case SNDRV_PCM_FORMAT_S20_3LE:
 240                 iface |= 0x0004;
 241                 break;
 242         case SNDRV_PCM_FORMAT_S24_LE:
 243                 iface |= 0x0008;
 244                 break;
 245         }
 246
 247         snd_soc_write(codec, WM8731_IFACE, iface);
 248         return 0;
 249 }
 250
 251 static int wm8731_pcm_prepare(struct snd_pcm_substream *substream,
 252                               struct snd_soc_dai *dai)
 253 {
 254         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 255         struct snd_soc_device *socdev = rtd->socdev;
 256         struct snd_soc_codec *codec = socdev->card->codec;
 257
 258         /* set active */
 259         snd_soc_write(codec, WM8731_ACTIVE, 0x0001);
 260
 261         return 0;
 262 }
 263
 264 static void wm8731_shutdown(struct snd_pcm_substream *substream,
 265                             struct snd_soc_dai *dai)
 266 {
 267         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 268         struct snd_soc_device *socdev = rtd->socdev;
 269         struct snd_soc_codec *codec = socdev->card->codec;
 270
 271         /* deactivate */
 272         if (!codec->active) {
 273                 udelay(50);
 274                 snd_soc_write(codec, WM8731_ACTIVE, 0x0);
 275         }
 276 }
 277
 278 static int wm8731_mute(struct snd_soc_dai *dai, int mute)
 279 {
 280         struct snd_soc_codec *codec = dai->codec;
 281         u16 mute_reg = snd_soc_read(codec, WM8731_APDIGI) & 0xfff7;
 282
 283         if (mute)
 284                 snd_soc_write(codec, WM8731_APDIGI, mute_reg | 0x8);
 285         else
 286                 snd_soc_write(codec, WM8731_APDIGI, mute_reg);
 287         return 0;
 288 }
 289
 290 static int wm8731_set_dai_sysclk(struct snd_soc_dai *codec_dai,
 291                 int clk_id, unsigned int freq, int dir)
 292 {
 293         struct snd_soc_codec *codec = codec_dai->codec;
 294         struct wm8731_priv *wm8731 = codec->private_data;
 295
 296         switch (freq) {
 297         case 11289600:
 298         case 12000000:
 299         case 12288000:
 300         case 16934400:
 301         case 18432000:
 302                 wm8731->sysclk = freq;
 303                 return 0;
 304         }
 305         return -EINVAL;
 306 }
 307
 308
 309 static int wm8731_set_dai_fmt(struct snd_soc_dai *codec_dai,
 310                 unsigned int fmt)
 311 {
 312         struct snd_soc_codec *codec = codec_dai->codec;
 313         u16 iface = 0;
 314
 315         /* set master/slave audio interface */
 316         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 317         case SND_SOC_DAIFMT_CBM_CFM:
 318                 iface |= 0x0040;
 319                 break;
 320         case SND_SOC_DAIFMT_CBS_CFS:
 321                 break;
 322         default:
 323                 return -EINVAL;
 324         }
 325
 326         /* interface format */
 327         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 328         case SND_SOC_DAIFMT_I2S:
 329                 iface |= 0x0002;
 330                 break;
 331         case SND_SOC_DAIFMT_RIGHT_J:
 332                 break;
 333         case SND_SOC_DAIFMT_LEFT_J:
 334                 iface |= 0x0001;
 335                 break;
 336         case SND_SOC_DAIFMT_DSP_A:
 337                 iface |= 0x0003;
 338                 break;
 339         case SND_SOC_DAIFMT_DSP_B:
 340                 iface |= 0x0013;
 341                 break;
 342         default:
 343                 return -EINVAL;
 344         }
 345
 346         /* clock inversion */
 347         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 348         case SND_SOC_DAIFMT_NB_NF:
 349                 break;
 350         case SND_SOC_DAIFMT_IB_IF:
 351                 iface |= 0x0090;
 352                 break;
 353         case SND_SOC_DAIFMT_IB_NF:
 354                 iface |= 0x0080;
 355                 break;
 356         case SND_SOC_DAIFMT_NB_IF:
 357                 iface |= 0x0010;
 358                 break;
 359         default:
 360                 return -EINVAL;
 361         }
 362
 363         /* set iface */
 364         snd_soc_write(codec, WM8731_IFACE, iface);
 365         return 0;
 366 }
 367
 368 static int wm8731_set_bias_level(struct snd_soc_codec *codec,
 369                                  enum snd_soc_bias_level level)
 370 {
 371         u16 reg;
 372
 373         switch (level) {
 374         case SND_SOC_BIAS_ON:
 375                 break;
 376         case SND_SOC_BIAS_PREPARE:
 377                 break;
 378         case SND_SOC_BIAS_STANDBY:
 379                 /* Clear PWROFF, gate CLKOUT, everything else as-is */
 380                 reg = snd_soc_read(codec, WM8731_PWR) & 0xff7f;
 381                 snd_soc_write(codec, WM8731_PWR, reg | 0x0040);
 382                 break;
 383         case SND_SOC_BIAS_OFF:
 384                 snd_soc_write(codec, WM8731_ACTIVE, 0x0);
 385                 snd_soc_write(codec, WM8731_PWR, 0xffff);
 386                 break;
 387         }
 388         codec->bias_level = level;
 389         return 0;
 390 }
 391
 392 #define WM8731_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
 393                 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 |\
 394                 SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\
 395                 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |\
 396                 SNDRV_PCM_RATE_96000)
 397
 398 #define WM8731_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
 399         SNDRV_PCM_FMTBIT_S24_LE)
 400
 401 static struct snd_soc_dai_ops wm8731_dai_ops = {
 402         .prepare        = wm8731_pcm_prepare,
 403         .hw_params      = wm8731_hw_params,
 404         .shutdown       = wm8731_shutdown,
 405         .digital_mute   = wm8731_mute,
 406         .set_sysclk     = wm8731_set_dai_sysclk,
 407         .set_fmt        = wm8731_set_dai_fmt,
 408 };
 409
 410 struct snd_soc_dai wm8731_dai = {
 411         .name = "WM8731",
 412         .playback = {
 413                 .stream_name = "Playback",
 414                 .channels_min = 1,
 415                 .channels_max = 2,
 416                 .rates = WM8731_RATES,
 417                 .formats = WM8731_FORMATS,},
 418         .capture = {
 419                 .stream_name = "Capture",
 420                 .channels_min = 1,
 421                 .channels_max = 2,
 422                 .rates = WM8731_RATES,
 423                 .formats = WM8731_FORMATS,},
 424         .ops = &wm8731_dai_ops,
 425         .symmetric_rates = 1,
 426 };
 427 EXPORT_SYMBOL_GPL(wm8731_dai);
 428
 429 #ifdef CONFIG_PM
 430 static int wm8731_suspend(struct platform_device *pdev, pm_message_t state)
 431 {
 432         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 433         struct snd_soc_codec *codec = socdev->card->codec;
 434         struct wm8731_priv *wm8731 = codec->private_data;
 435
 436         snd_soc_write(codec, WM8731_ACTIVE, 0x0);
 437         wm8731_set_bias_level(codec, SND_SOC_BIAS_OFF);
 438         regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies),
 439                                wm8731->supplies);
 440         return 0;
 441 }
 442
 443 static int wm8731_resume(struct platform_device *pdev)
 444 {
 445         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 446         struct snd_soc_codec *codec = socdev->card->codec;
 447         struct wm8731_priv *wm8731 = codec->private_data;
 448         int i, ret;
 449         u8 data[2];
 450         u16 *cache = codec->reg_cache;
 451
 452         ret = regulator_bulk_enable(ARRAY_SIZE(wm8731->supplies),
 453                                     wm8731->supplies);
 454         if (ret != 0)
 455                 return ret;
 456
 457         /* Sync reg_cache with the hardware */
 458         for (i = 0; i < ARRAY_SIZE(wm8731_reg); i++) {
 459                 data[0] = (i << 1) | ((cache[i] >> 8) & 0x0001);
 460                 data[1] = cache[i] & 0x00ff;
 461                 codec->hw_write(codec->control_data, data, 2);
 462         }
 463         wm8731_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 464         wm8731_set_bias_level(codec, codec->suspend_bias_level);
 465
 466         return 0;
 467 }
 468 #else
 469 #define wm8731_suspend NULL
 470 #define wm8731_resume NULL
 471 #endif
 472
 473 static int wm8731_probe(struct platform_device *pdev)
 474 {
 475         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 476         struct snd_soc_codec *codec;
 477         int ret = 0;
 478
 479         if (wm8731_codec == NULL) {
 480                 dev_err(&pdev->dev, "Codec device not registered\n");
 481                 return -ENODEV;
 482         }
 483
 484         socdev->card->codec = wm8731_codec;
 485         codec = wm8731_codec;
 486
 487         /* register pcms */
 488         ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
 489         if (ret < 0) {
 490                 dev_err(codec->dev, "failed to create pcms: %d\n", ret);
 491                 goto pcm_err;
 492         }
 493
 494         snd_soc_add_controls(codec, wm8731_snd_controls,
 495                              ARRAY_SIZE(wm8731_snd_controls));
 496         wm8731_add_widgets(codec);
 497
 498         return ret;
 499
 500 pcm_err:
 501         return ret;
 502 }
 503
 504 /* power down chip */
 505 static int wm8731_remove(struct platform_device *pdev)
 506 {
 507         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 508
 509         snd_soc_free_pcms(socdev);
 510         snd_soc_dapm_free(socdev);
 511
 512         return 0;
 513 }
 514
 515 struct snd_soc_codec_device soc_codec_dev_wm8731 = {
 516         .probe =        wm8731_probe,
 517         .remove =       wm8731_remove,
 518         .suspend =      wm8731_suspend,
 519         .resume =       wm8731_resume,
 520 };
 521 EXPORT_SYMBOL_GPL(soc_codec_dev_wm8731);
 522
 523 static int wm8731_register(struct wm8731_priv *wm8731,
 524                            enum snd_soc_control_type control)
 525 {
 526         int ret, i;
 527         struct snd_soc_codec *codec = &wm8731->codec;
 528
 529         if (wm8731_codec) {
 530                 dev_err(codec->dev, "Another WM8731 is registered\n");
 531                 ret = -EINVAL;
 532                 goto err;
 533         }
 534
 535         mutex_init(&codec->mutex);
 536         INIT_LIST_HEAD(&codec->dapm_widgets);
 537         INIT_LIST_HEAD(&codec->dapm_paths);
 538
 539         codec->private_data = wm8731;
 540         codec->name = "WM8731";
 541         codec->owner = THIS_MODULE;
 542         codec->bias_level = SND_SOC_BIAS_OFF;
 543         codec->set_bias_level = wm8731_set_bias_level;
 544         codec->dai = &wm8731_dai;
 545         codec->num_dai = 1;
 546         codec->reg_cache_size = WM8731_CACHEREGNUM;
 547         codec->reg_cache = &wm8731->reg_cache;
 548
 549         memcpy(codec->reg_cache, wm8731_reg, sizeof(wm8731_reg));
 550
 551         ret = snd_soc_codec_set_cache_io(codec, 7, 9, control);
 552         if (ret < 0) {
 553                 dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
 554                 goto err;
 555         }
 556
 557         for (i = 0; i < ARRAY_SIZE(wm8731->supplies); i++)
 558                 wm8731->supplies[i].supply = wm8731_supply_names[i];
 559
 560         ret = regulator_bulk_get(codec->dev, ARRAY_SIZE(wm8731->supplies),
 561                                  wm8731->supplies);
 562         if (ret != 0) {
 563                 dev_err(codec->dev, "Failed to request supplies: %d\n", ret);
 564                 goto err;
 565         }
 566
 567         ret = regulator_bulk_enable(ARRAY_SIZE(wm8731->supplies),
 568                                     wm8731->supplies);
 569         if (ret != 0) {
 570                 dev_err(codec->dev, "Failed to enable supplies: %d\n", ret);
 571                 goto err_regulator_get;
 572         }
 573
 574         ret = wm8731_reset(codec);
 575         if (ret < 0) {
 576                 dev_err(codec->dev, "Failed to issue reset: %d\n", ret);
 577                 goto err_regulator_enable;
 578         }
 579
 580         wm8731_dai.dev = codec->dev;
 581
 582         wm8731_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 583
 584         /* Latch the update bits */
 585         snd_soc_update_bits(codec, WM8731_LOUT1V, 0x100, 0);
 586         snd_soc_update_bits(codec, WM8731_ROUT1V, 0x100, 0);
 587         snd_soc_update_bits(codec, WM8731_LINVOL, 0x100, 0);
 588         snd_soc_update_bits(codec, WM8731_RINVOL, 0x100, 0);
 589
 590         /* Disable bypass path by default */
 591         snd_soc_update_bits(codec, WM8731_APANA, 0x4, 0);
 592
 593         wm8731_codec = codec;
 594
 595         ret = snd_soc_register_codec(codec);
 596         if (ret != 0) {
 597                 dev_err(codec->dev, "Failed to register codec: %d\n", ret);
 598                 goto err_regulator_enable;
 599         }
 600
 601         ret = snd_soc_register_dai(&wm8731_dai);
 602         if (ret != 0) {
 603                 dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
 604                 snd_soc_unregister_codec(codec);
 605                 goto err_codec;
 606         }
 607
 608         return 0;
 609
 610 err_codec:
 611         snd_soc_unregister_codec(codec);
 612 err_regulator_enable:
 613         regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);
 614 err_regulator_get:
 615         regulator_bulk_free(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);
 616 err:
 617         kfree(wm8731);
 618         return ret;
 619 }
 620
 621 static void wm8731_unregister(struct wm8731_priv *wm8731)
 622 {
 623         wm8731_set_bias_level(&wm8731->codec, SND_SOC_BIAS_OFF);
 624         snd_soc_unregister_dai(&wm8731_dai);
 625         snd_soc_unregister_codec(&wm8731->codec);
 626         regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);
 627         regulator_bulk_free(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);
 628         kfree(wm8731);
 629         wm8731_codec = NULL;
 630 }
 631
 632 #if defined(CONFIG_SPI_MASTER)
 633 static int __devinit wm8731_spi_probe(struct spi_device *spi)
 634 {
 635         struct snd_soc_codec *codec;
 636         struct wm8731_priv *wm8731;
 637
 638         wm8731 = kzalloc(sizeof(struct wm8731_priv), GFP_KERNEL);
 639         if (wm8731 == NULL)
 640                 return -ENOMEM;
 641
 642         codec = &wm8731->codec;
 643         codec->control_data = spi;
 644         codec->dev = &spi->dev;
 645
 646         dev_set_drvdata(&spi->dev, wm8731);
 647
 648         return wm8731_register(wm8731, SND_SOC_SPI);
 649 }
 650
 651 static int __devexit wm8731_spi_remove(struct spi_device *spi)
 652 {
 653         struct wm8731_priv *wm8731 = dev_get_drvdata(&spi->dev);
 654
 655         wm8731_unregister(wm8731);
 656
 657         return 0;
 658 }
 659
 660 static struct spi_driver wm8731_spi_driver = {
 661         .driver = {
 662                 .name   = "wm8731",
 663                 .bus    = &spi_bus_type,
 664                 .owner  = THIS_MODULE,
 665         },
 666         .probe          = wm8731_spi_probe,
 667         .remove         = __devexit_p(wm8731_spi_remove),
 668 };
 669 #endif /* CONFIG_SPI_MASTER */
 670
 671 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 672 static __devinit int wm8731_i2c_probe(struct i2c_client *i2c,
 673                                       const struct i2c_device_id *id)
 674 {
 675         struct wm8731_priv *wm8731;
 676         struct snd_soc_codec *codec;
 677
 678         wm8731 = kzalloc(sizeof(struct wm8731_priv), GFP_KERNEL);
 679         if (wm8731 == NULL)
 680                 return -ENOMEM;
 681
 682         codec = &wm8731->codec;
 683
 684         i2c_set_clientdata(i2c, wm8731);
 685         codec->control_data = i2c;
 686
 687         codec->dev = &i2c->dev;
 688
 689         return wm8731_register(wm8731, SND_SOC_I2C);
 690 }
 691
 692 static __devexit int wm8731_i2c_remove(struct i2c_client *client)
 693 {
 694         struct wm8731_priv *wm8731 = i2c_get_clientdata(client);
 695         wm8731_unregister(wm8731);
 696         return 0;
 697 }
 698
 699 static const struct i2c_device_id wm8731_i2c_id[] = {
 700         { "wm8731", 0 },
 701         { }
 702 };
 703 MODULE_DEVICE_TABLE(i2c, wm8731_i2c_id);
 704
 705 static struct i2c_driver wm8731_i2c_driver = {
 706         .driver = {
 707                 .name = "WM8731 I2C Codec",
 708                 .owner = THIS_MODULE,
 709         },
 710         .probe =    wm8731_i2c_probe,
 711         .remove =   __devexit_p(wm8731_i2c_remove),
 712         .id_table = wm8731_i2c_id,
 713 };
 714 #endif
 715
 716 static int __init wm8731_modinit(void)
 717 {
 718         int ret;
 719 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 720         ret = i2c_add_driver(&wm8731_i2c_driver);
 721         if (ret != 0) {
 722                 printk(KERN_ERR "Failed to register WM8731 I2C driver: %d\n",
 723                        ret);
 724         }
 725 #endif
 726 #if defined(CONFIG_SPI_MASTER)
 727         ret = spi_register_driver(&wm8731_spi_driver);
 728         if (ret != 0) {
 729                 printk(KERN_ERR "Failed to register WM8731 SPI driver: %d\n",
 730                        ret);
 731         }
 732 #endif
 733         return 0;
 734 }
 735 module_init(wm8731_modinit);
 736
 737 static void __exit wm8731_exit(void)
 738 {
 739 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 740         i2c_del_driver(&wm8731_i2c_driver);
 741 #endif
 742 #if defined(CONFIG_SPI_MASTER)
 743         spi_unregister_driver(&wm8731_spi_driver);
 744 #endif
 745 }
 746 module_exit(wm8731_exit);
 747
 748 MODULE_DESCRIPTION("ASoC WM8731 driver");
 749 MODULE_AUTHOR("Richard Purdie");
 750 MODULE_LICENSE("GPL");