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/slab.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/regulator/consumer.h>
  24 #include <linux/spi/spi.h>
  25 #include <sound/core.h>
  26 #include <sound/pcm.h>
  27 #include <sound/pcm_params.h>
  28 #include <sound/soc.h>
  29 #include <sound/soc-dapm.h>
  30 #include <sound/initval.h>
  31 #include <sound/tlv.h>
  32
  33 #include "wm8731.h"
  34
  35 #define WM8731_NUM_SUPPLIES 4
  36 static const char *wm8731_supply_names[WM8731_NUM_SUPPLIES] = {
  37         "AVDD",
  38         "HPVDD",
  39         "DCVDD",
  40         "DBVDD",
  41 };
  42
  43 /* codec private data */
  44 struct wm8731_priv {
  45         enum snd_soc_control_type control_type;
  46         void *control_data;
  47         struct regulator_bulk_data supplies[WM8731_NUM_SUPPLIES];
  48         u16 reg_cache[WM8731_CACHEREGNUM];
  49         unsigned int sysclk;
  50 };
  51
  52
  53 /*
  54  * wm8731 register cache
  55  * We can't read the WM8731 register space when we are
  56  * using 2 wire for device control, so we cache them instead.
  57  * There is no point in caching the reset register
  58  */
  59 static const u16 wm8731_reg[WM8731_CACHEREGNUM] = {
  60         0x0097, 0x0097, 0x0079, 0x0079,
  61         0x000a, 0x0008, 0x009f, 0x000a,
  62         0x0000, 0x0000
  63 };
  64
  65 #define wm8731_reset(c) snd_soc_write(c, WM8731_RESET, 0)
  66
  67 static const char *wm8731_input_select[] = {"Line In", "Mic"};
  68 static const char *wm8731_deemph[] = {"None", "32Khz", "44.1Khz", "48Khz"};
  69
  70 static const struct soc_enum wm8731_enum[] = {
  71         SOC_ENUM_SINGLE(WM8731_APANA, 2, 2, wm8731_input_select),
  72         SOC_ENUM_SINGLE(WM8731_APDIGI, 1, 4, wm8731_deemph),
  73 };
  74
  75 static const DECLARE_TLV_DB_SCALE(in_tlv, -3450, 150, 0);
  76 static const DECLARE_TLV_DB_SCALE(sidetone_tlv, -1500, 300, 0);
  77 static const DECLARE_TLV_DB_SCALE(out_tlv, -12100, 100, 1);
  78
  79 static const struct snd_kcontrol_new wm8731_snd_controls[] = {
  80
  81 SOC_DOUBLE_R_TLV("Master Playback Volume", WM8731_LOUT1V, WM8731_ROUT1V,
  82                  0, 127, 0, out_tlv),
  83 SOC_DOUBLE_R("Master Playback ZC Switch", WM8731_LOUT1V, WM8731_ROUT1V,
  84         7, 1, 0),
  85
  86 SOC_DOUBLE_R_TLV("Capture Volume", WM8731_LINVOL, WM8731_RINVOL, 0, 31, 0,
  87                  in_tlv),
  88 SOC_DOUBLE_R("Line Capture Switch", WM8731_LINVOL, WM8731_RINVOL, 7, 1, 1),
  89
  90 SOC_SINGLE("Mic Boost (+20dB)", WM8731_APANA, 0, 1, 0),
  91 SOC_SINGLE("Mic Capture Switch", WM8731_APANA, 1, 1, 1),
  92
  93 SOC_SINGLE_TLV("Sidetone Playback Volume", WM8731_APANA, 6, 3, 1,
  94                sidetone_tlv),
  95
  96 SOC_SINGLE("ADC High Pass Filter Switch", WM8731_APDIGI, 0, 1, 1),
  97 SOC_SINGLE("Store DC Offset Switch", WM8731_APDIGI, 4, 1, 0),
  98
  99 SOC_ENUM("Playback De-emphasis", wm8731_enum[1]),
 100 };
 101
 102 /* Output Mixer */
 103 static const struct snd_kcontrol_new wm8731_output_mixer_controls[] = {
 104 SOC_DAPM_SINGLE("Line Bypass Switch", WM8731_APANA, 3, 1, 0),
 105 SOC_DAPM_SINGLE("Mic Sidetone Switch", WM8731_APANA, 5, 1, 0),
 106 SOC_DAPM_SINGLE("HiFi Playback Switch", WM8731_APANA, 4, 1, 0),
 107 };
 108
 109 /* Input mux */
 110 static const struct snd_kcontrol_new wm8731_input_mux_controls =
 111 SOC_DAPM_ENUM("Input Select", wm8731_enum[0]);
 112
 113 static const struct snd_soc_dapm_widget wm8731_dapm_widgets[] = {
 114 SND_SOC_DAPM_MIXER("Output Mixer", WM8731_PWR, 4, 1,
 115         &wm8731_output_mixer_controls[0],
 116         ARRAY_SIZE(wm8731_output_mixer_controls)),
 117 SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8731_PWR, 3, 1),
 118 SND_SOC_DAPM_OUTPUT("LOUT"),
 119 SND_SOC_DAPM_OUTPUT("LHPOUT"),
 120 SND_SOC_DAPM_OUTPUT("ROUT"),
 121 SND_SOC_DAPM_OUTPUT("RHPOUT"),
 122 SND_SOC_DAPM_ADC("ADC", "HiFi Capture", WM8731_PWR, 2, 1),
 123 SND_SOC_DAPM_MUX("Input Mux", SND_SOC_NOPM, 0, 0, &wm8731_input_mux_controls),
 124 SND_SOC_DAPM_PGA("Line Input", WM8731_PWR, 0, 1, NULL, 0),
 125 SND_SOC_DAPM_MICBIAS("Mic Bias", WM8731_PWR, 1, 1),
 126 SND_SOC_DAPM_INPUT("MICIN"),
 127 SND_SOC_DAPM_INPUT("RLINEIN"),
 128 SND_SOC_DAPM_INPUT("LLINEIN"),
 129 };
 130
 131 static const struct snd_soc_dapm_route intercon[] = {
 132         /* output mixer */
 133         {"Output Mixer", "Line Bypass Switch", "Line Input"},
 134         {"Output Mixer", "HiFi Playback Switch", "DAC"},
 135         {"Output Mixer", "Mic Sidetone Switch", "Mic Bias"},
 136
 137         /* outputs */
 138         {"RHPOUT", NULL, "Output Mixer"},
 139         {"ROUT", NULL, "Output Mixer"},
 140         {"LHPOUT", NULL, "Output Mixer"},
 141         {"LOUT", NULL, "Output Mixer"},
 142
 143         /* input mux */
 144         {"Input Mux", "Line In", "Line Input"},
 145         {"Input Mux", "Mic", "Mic Bias"},
 146         {"ADC", NULL, "Input Mux"},
 147
 148         /* inputs */
 149         {"Line Input", NULL, "LLINEIN"},
 150         {"Line Input", NULL, "RLINEIN"},
 151         {"Mic Bias", NULL, "MICIN"},
 152 };
 153
 154 static int wm8731_add_widgets(struct snd_soc_codec *codec)
 155 {
 156         snd_soc_dapm_new_controls(codec, wm8731_dapm_widgets,
 157                                   ARRAY_SIZE(wm8731_dapm_widgets));
 158
 159         snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));
 160
 161         return 0;
 162 }
 163
 164 struct _coeff_div {
 165         u32 mclk;
 166         u32 rate;
 167         u16 fs;
 168         u8 sr:4;
 169         u8 bosr:1;
 170         u8 usb:1;
 171 };
 172
 173 /* codec mclk clock divider coefficients */
 174 static const struct _coeff_div coeff_div[] = {
 175         /* 48k */
 176         {12288000, 48000, 256, 0x0, 0x0, 0x0},
 177         {18432000, 48000, 384, 0x0, 0x1, 0x0},
 178         {12000000, 48000, 250, 0x0, 0x0, 0x1},
 179
 180         /* 32k */
 181         {12288000, 32000, 384, 0x6, 0x0, 0x0},
 182         {18432000, 32000, 576, 0x6, 0x1, 0x0},
 183         {12000000, 32000, 375, 0x6, 0x0, 0x1},
 184
 185         /* 8k */
 186         {12288000, 8000, 1536, 0x3, 0x0, 0x0},
 187         {18432000, 8000, 2304, 0x3, 0x1, 0x0},
 188         {11289600, 8000, 1408, 0xb, 0x0, 0x0},
 189         {16934400, 8000, 2112, 0xb, 0x1, 0x0},
 190         {12000000, 8000, 1500, 0x3, 0x0, 0x1},
 191
 192         /* 96k */
 193         {12288000, 96000, 128, 0x7, 0x0, 0x0},
 194         {18432000, 96000, 192, 0x7, 0x1, 0x0},
 195         {12000000, 96000, 125, 0x7, 0x0, 0x1},
 196
 197         /* 44.1k */
 198         {11289600, 44100, 256, 0x8, 0x0, 0x0},
 199         {16934400, 44100, 384, 0x8, 0x1, 0x0},
 200         {12000000, 44100, 272, 0x8, 0x1, 0x1},
 201
 202         /* 88.2k */
 203         {11289600, 88200, 128, 0xf, 0x0, 0x0},
 204         {16934400, 88200, 192, 0xf, 0x1, 0x0},
 205         {12000000, 88200, 136, 0xf, 0x1, 0x1},
 206 };
 207
 208 static inline int get_coeff(int mclk, int rate)
 209 {
 210         int i;
 211
 212         for (i = 0; i < ARRAY_SIZE(coeff_div); i++) {
 213                 if (coeff_div[i].rate == rate && coeff_div[i].mclk == mclk)
 214                         return i;
 215         }
 216         return 0;
 217 }
 218
 219 static int wm8731_hw_params(struct snd_pcm_substream *substream,
 220                             struct snd_pcm_hw_params *params,
 221                             struct snd_soc_dai *dai)
 222 {
 223         struct snd_soc_codec *codec = dai->codec;
 224         struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
 225         u16 iface = snd_soc_read(codec, WM8731_IFACE) & 0xfff3;
 226         int i = get_coeff(wm8731->sysclk, params_rate(params));
 227         u16 srate = (coeff_div[i].sr << 2) |
 228                 (coeff_div[i].bosr << 1) | coeff_div[i].usb;
 229
 230         snd_soc_write(codec, WM8731_SRATE, srate);
 231
 232         /* bit size */
 233         switch (params_format(params)) {
 234         case SNDRV_PCM_FORMAT_S16_LE:
 235                 break;
 236         case SNDRV_PCM_FORMAT_S20_3LE:
 237                 iface |= 0x0004;
 238                 break;
 239         case SNDRV_PCM_FORMAT_S24_LE:
 240                 iface |= 0x0008;
 241                 break;
 242         }
 243
 244         snd_soc_write(codec, WM8731_IFACE, iface);
 245         return 0;
 246 }
 247
 248 static int wm8731_pcm_prepare(struct snd_pcm_substream *substream,
 249                               struct snd_soc_dai *dai)
 250 {
 251         struct snd_soc_codec *codec = dai->codec;
 252
 253         /* set active */
 254         snd_soc_write(codec, WM8731_ACTIVE, 0x0001);
 255
 256         return 0;
 257 }
 258
 259 static void wm8731_shutdown(struct snd_pcm_substream *substream,
 260                             struct snd_soc_dai *dai)
 261 {
 262         struct snd_soc_codec *codec = dai->codec;
 263
 264         /* deactivate */
 265         if (!codec->active) {
 266                 udelay(50);
 267                 snd_soc_write(codec, WM8731_ACTIVE, 0x0);
 268         }
 269 }
 270
 271 static int wm8731_mute(struct snd_soc_dai *dai, int mute)
 272 {
 273         struct snd_soc_codec *codec = dai->codec;
 274         u16 mute_reg = snd_soc_read(codec, WM8731_APDIGI) & 0xfff7;
 275
 276         if (mute)
 277                 snd_soc_write(codec, WM8731_APDIGI, mute_reg | 0x8);
 278         else
 279                 snd_soc_write(codec, WM8731_APDIGI, mute_reg);
 280         return 0;
 281 }
 282
 283 static int wm8731_set_dai_sysclk(struct snd_soc_dai *codec_dai,
 284                 int clk_id, unsigned int freq, int dir)
 285 {
 286         struct snd_soc_codec *codec = codec_dai->codec;
 287         struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
 288
 289         switch (freq) {
 290         case 11289600:
 291         case 12000000:
 292         case 12288000:
 293         case 16934400:
 294         case 18432000:
 295                 wm8731->sysclk = freq;
 296                 return 0;
 297         }
 298         return -EINVAL;
 299 }
 300
 301
 302 static int wm8731_set_dai_fmt(struct snd_soc_dai *codec_dai,
 303                 unsigned int fmt)
 304 {
 305         struct snd_soc_codec *codec = codec_dai->codec;
 306         u16 iface = 0;
 307
 308         /* set master/slave audio interface */
 309         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 310         case SND_SOC_DAIFMT_CBM_CFM:
 311                 iface |= 0x0040;
 312                 break;
 313         case SND_SOC_DAIFMT_CBS_CFS:
 314                 break;
 315         default:
 316                 return -EINVAL;
 317         }
 318
 319         /* interface format */
 320         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 321         case SND_SOC_DAIFMT_I2S:
 322                 iface |= 0x0002;
 323                 break;
 324         case SND_SOC_DAIFMT_RIGHT_J:
 325                 break;
 326         case SND_SOC_DAIFMT_LEFT_J:
 327                 iface |= 0x0001;
 328                 break;
 329         case SND_SOC_DAIFMT_DSP_A:
 330                 iface |= 0x0003;
 331                 break;
 332         case SND_SOC_DAIFMT_DSP_B:
 333                 iface |= 0x0013;
 334                 break;
 335         default:
 336                 return -EINVAL;
 337         }
 338
 339         /* clock inversion */
 340         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 341         case SND_SOC_DAIFMT_NB_NF:
 342                 break;
 343         case SND_SOC_DAIFMT_IB_IF:
 344                 iface |= 0x0090;
 345                 break;
 346         case SND_SOC_DAIFMT_IB_NF:
 347                 iface |= 0x0080;
 348                 break;
 349         case SND_SOC_DAIFMT_NB_IF:
 350                 iface |= 0x0010;
 351                 break;
 352         default:
 353                 return -EINVAL;
 354         }
 355
 356         /* set iface */
 357         snd_soc_write(codec, WM8731_IFACE, iface);
 358         return 0;
 359 }
 360
 361 static int wm8731_set_bias_level(struct snd_soc_codec *codec,
 362                                  enum snd_soc_bias_level level)
 363 {
 364         struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
 365         int i, ret;
 366         u8 data[2];
 367         u16 *cache = codec->reg_cache;
 368         u16 reg;
 369
 370         switch (level) {
 371         case SND_SOC_BIAS_ON:
 372                 break;
 373         case SND_SOC_BIAS_PREPARE:
 374                 break;
 375         case SND_SOC_BIAS_STANDBY:
 376                 if (codec->bias_level == SND_SOC_BIAS_OFF) {
 377                         ret = regulator_bulk_enable(ARRAY_SIZE(wm8731->supplies),
 378                                                     wm8731->supplies);
 379                         if (ret != 0)
 380                                 return ret;
 381
 382                         /* Sync reg_cache with the hardware */
 383                         for (i = 0; i < ARRAY_SIZE(wm8731_reg); i++) {
 384                                 if (cache[i] == wm8731_reg[i])
 385                                         continue;
 386
 387                                 data[0] = (i << 1) | ((cache[i] >> 8)
 388                                                       & 0x0001);
 389                                 data[1] = cache[i] & 0x00ff;
 390                                 codec->hw_write(codec->control_data, data, 2);
 391                         }
 392                 }
 393
 394                 /* Clear PWROFF, gate CLKOUT, everything else as-is */
 395                 reg = snd_soc_read(codec, WM8731_PWR) & 0xff7f;
 396                 snd_soc_write(codec, WM8731_PWR, reg | 0x0040);
 397                 break;
 398         case SND_SOC_BIAS_OFF:
 399                 snd_soc_write(codec, WM8731_ACTIVE, 0x0);
 400                 snd_soc_write(codec, WM8731_PWR, 0xffff);
 401                 regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies),
 402                                        wm8731->supplies);
 403                 break;
 404         }
 405         codec->bias_level = level;
 406         return 0;
 407 }
 408
 409 #define WM8731_RATES SNDRV_PCM_RATE_8000_96000
 410
 411 #define WM8731_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
 412         SNDRV_PCM_FMTBIT_S24_LE)
 413
 414 static struct snd_soc_dai_ops wm8731_dai_ops = {
 415         .prepare        = wm8731_pcm_prepare,
 416         .hw_params      = wm8731_hw_params,
 417         .shutdown       = wm8731_shutdown,
 418         .digital_mute   = wm8731_mute,
 419         .set_sysclk     = wm8731_set_dai_sysclk,
 420         .set_fmt        = wm8731_set_dai_fmt,
 421 };
 422
 423 static struct snd_soc_dai_driver wm8731_dai = {
 424         .name = "wm8731-hifi",
 425         .playback = {
 426                 .stream_name = "Playback",
 427                 .channels_min = 1,
 428                 .channels_max = 2,
 429                 .rates = WM8731_RATES,
 430                 .formats = WM8731_FORMATS,},
 431         .capture = {
 432                 .stream_name = "Capture",
 433                 .channels_min = 1,
 434                 .channels_max = 2,
 435                 .rates = WM8731_RATES,
 436                 .formats = WM8731_FORMATS,},
 437         .ops = &wm8731_dai_ops,
 438         .symmetric_rates = 1,
 439 };
 440
 441 #ifdef CONFIG_PM
 442 static int wm8731_suspend(struct snd_soc_codec *codec, pm_message_t state)
 443 {
 444         wm8731_set_bias_level(codec, SND_SOC_BIAS_OFF);
 445
 446         return 0;
 447 }
 448
 449 static int wm8731_resume(struct snd_soc_codec *codec)
 450 {
 451         wm8731_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 452
 453         return 0;
 454 }
 455 #else
 456 #define wm8731_suspend NULL
 457 #define wm8731_resume NULL
 458 #endif
 459
 460 static int wm8731_probe(struct snd_soc_codec *codec)
 461 {
 462         struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
 463         int ret = 0, i;
 464
 465         codec->bias_level = SND_SOC_BIAS_OFF,
 466         codec->control_data = wm8731->control_data;
 467
 468         ret = snd_soc_codec_set_cache_io(codec, 7, 9, wm8731->control_type);
 469         if (ret < 0) {
 470                 dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
 471                 return ret;
 472         }
 473
 474         for (i = 0; i < ARRAY_SIZE(wm8731->supplies); i++)
 475                 wm8731->supplies[i].supply = wm8731_supply_names[i];
 476
 477         ret = regulator_bulk_get(codec->dev, ARRAY_SIZE(wm8731->supplies),
 478                                  wm8731->supplies);
 479         if (ret != 0) {
 480                 dev_err(codec->dev, "Failed to request supplies: %d\n", ret);
 481                 return ret;
 482         }
 483
 484         ret = regulator_bulk_enable(ARRAY_SIZE(wm8731->supplies),
 485                                     wm8731->supplies);
 486         if (ret != 0) {
 487                 dev_err(codec->dev, "Failed to enable supplies: %d\n", ret);
 488                 goto err_regulator_get;
 489         }
 490
 491         ret = wm8731_reset(codec);
 492         if (ret < 0) {
 493                 dev_err(codec->dev, "Failed to issue reset: %d\n", ret);
 494                 goto err_regulator_enable;
 495         }
 496
 497         wm8731_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 498
 499         /* Latch the update bits */
 500         snd_soc_update_bits(codec, WM8731_LOUT1V, 0x100, 0);
 501         snd_soc_update_bits(codec, WM8731_ROUT1V, 0x100, 0);
 502         snd_soc_update_bits(codec, WM8731_LINVOL, 0x100, 0);
 503         snd_soc_update_bits(codec, WM8731_RINVOL, 0x100, 0);
 504
 505         /* Disable bypass path by default */
 506         snd_soc_update_bits(codec, WM8731_APANA, 0x4, 0);
 507
 508         snd_soc_add_controls(codec, wm8731_snd_controls,
 509                              ARRAY_SIZE(wm8731_snd_controls));
 510         wm8731_add_widgets(codec);
 511
 512         /* Regulators will have been enabled by bias management */
 513         regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);
 514
 515         return 0;
 516
 517 err_regulator_enable:
 518         regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);
 519 err_regulator_get:
 520         regulator_bulk_free(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);
 521
 522         kfree(wm8731);
 523         return ret;
 524 }
 525
 526 /* power down chip */
 527 static int wm8731_remove(struct snd_soc_codec *codec)
 528 {
 529         struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
 530
 531         wm8731_set_bias_level(codec, SND_SOC_BIAS_OFF);
 532
 533         regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);
 534         regulator_bulk_free(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);
 535
 536         return 0;
 537 }
 538
 539 static struct snd_soc_codec_driver soc_codec_dev_wm8731 = {
 540         .probe =        wm8731_probe,
 541         .remove =       wm8731_remove,
 542         .suspend =      wm8731_suspend,
 543         .resume =       wm8731_resume,
 544         .set_bias_level = wm8731_set_bias_level,
 545         .reg_cache_size = sizeof(wm8731_reg),
 546         .reg_word_size = sizeof(u16),
 547         .reg_cache_default = wm8731_reg,
 548 };
 549
 550 #if defined(CONFIG_SPI_MASTER)
 551 static int __devinit wm8731_spi_probe(struct spi_device *spi)
 552 {
 553         struct wm8731_priv *wm8731;
 554         int ret;
 555
 556         wm8731 = kzalloc(sizeof(struct wm8731_priv), GFP_KERNEL);
 557         if (wm8731 == NULL)
 558                 return -ENOMEM;
 559
 560         wm8731->control_data = spi;
 561         wm8731->control_type = SND_SOC_SPI;
 562         spi_set_drvdata(spi, wm8731);
 563
 564         ret = snd_soc_register_codec(&spi->dev,
 565                         &soc_codec_dev_wm8731, &wm8731_dai, 1);
 566         if (ret < 0)
 567                 kfree(wm8731);
 568         return ret;
 569 }
 570
 571 static int __devexit wm8731_spi_remove(struct spi_device *spi)
 572 {
 573         snd_soc_unregister_codec(&spi->dev);
 574         kfree(spi_get_drvdata(spi));
 575         return 0;
 576 }
 577
 578 static struct spi_driver wm8731_spi_driver = {
 579         .driver = {
 580                 .name   = "wm8731-codec",
 581                 .bus    = &spi_bus_type,
 582                 .owner  = THIS_MODULE,
 583         },
 584         .probe          = wm8731_spi_probe,
 585         .remove         = __devexit_p(wm8731_spi_remove),
 586 };
 587 #endif /* CONFIG_SPI_MASTER */
 588
 589 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 590 static __devinit int wm8731_i2c_probe(struct i2c_client *i2c,
 591                                       const struct i2c_device_id *id)
 592 {
 593         struct wm8731_priv *wm8731;
 594         int ret;
 595
 596         wm8731 = kzalloc(sizeof(struct wm8731_priv), GFP_KERNEL);
 597         if (wm8731 == NULL)
 598                 return -ENOMEM;
 599
 600         i2c_set_clientdata(i2c, wm8731);
 601         wm8731->control_data = i2c;
 602         wm8731->control_type = SND_SOC_I2C;
 603
 604         ret =  snd_soc_register_codec(&i2c->dev,
 605                         &soc_codec_dev_wm8731, &wm8731_dai, 1);
 606         if (ret < 0)
 607                 kfree(wm8731);
 608         return ret;
 609 }
 610
 611 static __devexit int wm8731_i2c_remove(struct i2c_client *client)
 612 {
 613         snd_soc_unregister_codec(&client->dev);
 614         kfree(i2c_get_clientdata(client));
 615         return 0;
 616 }
 617
 618 static const struct i2c_device_id wm8731_i2c_id[] = {
 619         { "wm8731", 0 },
 620         { }
 621 };
 622 MODULE_DEVICE_TABLE(i2c, wm8731_i2c_id);
 623
 624 static struct i2c_driver wm8731_i2c_driver = {
 625         .driver = {
 626                 .name = "wm8731-codec",
 627                 .owner = THIS_MODULE,
 628         },
 629         .probe =    wm8731_i2c_probe,
 630         .remove =   __devexit_p(wm8731_i2c_remove),
 631         .id_table = wm8731_i2c_id,
 632 };
 633 #endif
 634
 635 static int __init wm8731_modinit(void)
 636 {
 637         int ret = 0;
 638 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 639         ret = i2c_add_driver(&wm8731_i2c_driver);
 640         if (ret != 0) {
 641                 printk(KERN_ERR "Failed to register WM8731 I2C driver: %d\n",
 642                        ret);
 643         }
 644 #endif
 645 #if defined(CONFIG_SPI_MASTER)
 646         ret = spi_register_driver(&wm8731_spi_driver);
 647         if (ret != 0) {
 648                 printk(KERN_ERR "Failed to register WM8731 SPI driver: %d\n",
 649                        ret);
 650         }
 651 #endif
 652         return ret;
 653 }
 654 module_init(wm8731_modinit);
 655
 656 static void __exit wm8731_exit(void)
 657 {
 658 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 659         i2c_del_driver(&wm8731_i2c_driver);
 660 #endif
 661 #if defined(CONFIG_SPI_MASTER)
 662         spi_unregister_driver(&wm8731_spi_driver);
 663 #endif
 664 }
 665 module_exit(wm8731_exit);
 666
 667 MODULE_DESCRIPTION("ASoC WM8731 driver");
 668 MODULE_AUTHOR("Richard Purdie");
 669 MODULE_LICENSE("GPL");