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         struct regulator_bulk_data supplies[WM8731_NUM_SUPPLIES];
  47         u16 reg_cache[WM8731_CACHEREGNUM];
  48         unsigned int sysclk;
  49         int sysclk_type;
  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_SUPPLY("OSC", WM8731_PWR, 5, 1, NULL, 0),
 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 int wm8731_check_osc(struct snd_soc_dapm_widget *source,
 133                             struct snd_soc_dapm_widget *sink)
 134 {
 135         struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(source->codec);
 136
 137         return wm8731->sysclk_type == WM8731_SYSCLK_MCLK;
 138 }
 139
 140 static const struct snd_soc_dapm_route intercon[] = {
 141         {"DAC", NULL, "OSC", wm8731_check_osc},
 142         {"ADC", NULL, "OSC", wm8731_check_osc},
 143
 144         /* output mixer */
 145         {"Output Mixer", "Line Bypass Switch", "Line Input"},
 146         {"Output Mixer", "HiFi Playback Switch", "DAC"},
 147         {"Output Mixer", "Mic Sidetone Switch", "Mic Bias"},
 148
 149         /* outputs */
 150         {"RHPOUT", NULL, "Output Mixer"},
 151         {"ROUT", NULL, "Output Mixer"},
 152         {"LHPOUT", NULL, "Output Mixer"},
 153         {"LOUT", NULL, "Output Mixer"},
 154
 155         /* input mux */
 156         {"Input Mux", "Line In", "Line Input"},
 157         {"Input Mux", "Mic", "Mic Bias"},
 158         {"ADC", NULL, "Input Mux"},
 159
 160         /* inputs */
 161         {"Line Input", NULL, "LLINEIN"},
 162         {"Line Input", NULL, "RLINEIN"},
 163         {"Mic Bias", NULL, "MICIN"},
 164 };
 165
 166 static int wm8731_add_widgets(struct snd_soc_codec *codec)
 167 {
 168         snd_soc_dapm_new_controls(codec, wm8731_dapm_widgets,
 169                                   ARRAY_SIZE(wm8731_dapm_widgets));
 170
 171         snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));
 172
 173         return 0;
 174 }
 175
 176 struct _coeff_div {
 177         u32 mclk;
 178         u32 rate;
 179         u16 fs;
 180         u8 sr:4;
 181         u8 bosr:1;
 182         u8 usb:1;
 183 };
 184
 185 /* codec mclk clock divider coefficients */
 186 static const struct _coeff_div coeff_div[] = {
 187         /* 48k */
 188         {12288000, 48000, 256, 0x0, 0x0, 0x0},
 189         {18432000, 48000, 384, 0x0, 0x1, 0x0},
 190         {12000000, 48000, 250, 0x0, 0x0, 0x1},
 191
 192         /* 32k */
 193         {12288000, 32000, 384, 0x6, 0x0, 0x0},
 194         {18432000, 32000, 576, 0x6, 0x1, 0x0},
 195         {12000000, 32000, 375, 0x6, 0x0, 0x1},
 196
 197         /* 8k */
 198         {12288000, 8000, 1536, 0x3, 0x0, 0x0},
 199         {18432000, 8000, 2304, 0x3, 0x1, 0x0},
 200         {11289600, 8000, 1408, 0xb, 0x0, 0x0},
 201         {16934400, 8000, 2112, 0xb, 0x1, 0x0},
 202         {12000000, 8000, 1500, 0x3, 0x0, 0x1},
 203
 204         /* 96k */
 205         {12288000, 96000, 128, 0x7, 0x0, 0x0},
 206         {18432000, 96000, 192, 0x7, 0x1, 0x0},
 207         {12000000, 96000, 125, 0x7, 0x0, 0x1},
 208
 209         /* 44.1k */
 210         {11289600, 44100, 256, 0x8, 0x0, 0x0},
 211         {16934400, 44100, 384, 0x8, 0x1, 0x0},
 212         {12000000, 44100, 272, 0x8, 0x1, 0x1},
 213
 214         /* 88.2k */
 215         {11289600, 88200, 128, 0xf, 0x0, 0x0},
 216         {16934400, 88200, 192, 0xf, 0x1, 0x0},
 217         {12000000, 88200, 136, 0xf, 0x1, 0x1},
 218 };
 219
 220 static inline int get_coeff(int mclk, int rate)
 221 {
 222         int i;
 223
 224         for (i = 0; i < ARRAY_SIZE(coeff_div); i++) {
 225                 if (coeff_div[i].rate == rate && coeff_div[i].mclk == mclk)
 226                         return i;
 227         }
 228         return 0;
 229 }
 230
 231 static int wm8731_hw_params(struct snd_pcm_substream *substream,
 232                             struct snd_pcm_hw_params *params,
 233                             struct snd_soc_dai *dai)
 234 {
 235         struct snd_soc_codec *codec = dai->codec;
 236         struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
 237         u16 iface = snd_soc_read(codec, WM8731_IFACE) & 0xfff3;
 238         int i = get_coeff(wm8731->sysclk, params_rate(params));
 239         u16 srate = (coeff_div[i].sr << 2) |
 240                 (coeff_div[i].bosr << 1) | coeff_div[i].usb;
 241
 242         snd_soc_write(codec, WM8731_SRATE, srate);
 243
 244         /* bit size */
 245         switch (params_format(params)) {
 246         case SNDRV_PCM_FORMAT_S16_LE:
 247                 break;
 248         case SNDRV_PCM_FORMAT_S20_3LE:
 249                 iface |= 0x0004;
 250                 break;
 251         case SNDRV_PCM_FORMAT_S24_LE:
 252                 iface |= 0x0008;
 253                 break;
 254         }
 255
 256         snd_soc_write(codec, WM8731_IFACE, iface);
 257         return 0;
 258 }
 259
 260 static int wm8731_pcm_prepare(struct snd_pcm_substream *substream,
 261                               struct snd_soc_dai *dai)
 262 {
 263         struct snd_soc_codec *codec = dai->codec;
 264
 265         /* set active */
 266         snd_soc_write(codec, WM8731_ACTIVE, 0x0001);
 267
 268         return 0;
 269 }
 270
 271 static void wm8731_shutdown(struct snd_pcm_substream *substream,
 272                             struct snd_soc_dai *dai)
 273 {
 274         struct snd_soc_codec *codec = dai->codec;
 275
 276         /* deactivate */
 277         if (!codec->active) {
 278                 udelay(50);
 279                 snd_soc_write(codec, WM8731_ACTIVE, 0x0);
 280         }
 281 }
 282
 283 static int wm8731_mute(struct snd_soc_dai *dai, int mute)
 284 {
 285         struct snd_soc_codec *codec = dai->codec;
 286         u16 mute_reg = snd_soc_read(codec, WM8731_APDIGI) & 0xfff7;
 287
 288         if (mute)
 289                 snd_soc_write(codec, WM8731_APDIGI, mute_reg | 0x8);
 290         else
 291                 snd_soc_write(codec, WM8731_APDIGI, mute_reg);
 292         return 0;
 293 }
 294
 295 static int wm8731_set_dai_sysclk(struct snd_soc_dai *codec_dai,
 296                 int clk_id, unsigned int freq, int dir)
 297 {
 298         struct snd_soc_codec *codec = codec_dai->codec;
 299         struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
 300
 301         switch (clk_id) {
 302         case WM8731_SYSCLK_XTAL:
 303         case WM8731_SYSCLK_MCLK:
 304                 wm8731->sysclk_type = clk_id;
 305                 break;
 306         default:
 307                 return -EINVAL;
 308         }
 309
 310         switch (freq) {
 311         case 11289600:
 312         case 12000000:
 313         case 12288000:
 314         case 16934400:
 315         case 18432000:
 316                 wm8731->sysclk = freq;
 317                 break;
 318         default:
 319                 return -EINVAL;
 320         }
 321
 322         snd_soc_dapm_sync(codec);
 323
 324         return 0;
 325 }
 326
 327
 328 static int wm8731_set_dai_fmt(struct snd_soc_dai *codec_dai,
 329                 unsigned int fmt)
 330 {
 331         struct snd_soc_codec *codec = codec_dai->codec;
 332         u16 iface = 0;
 333
 334         /* set master/slave audio interface */
 335         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 336         case SND_SOC_DAIFMT_CBM_CFM:
 337                 iface |= 0x0040;
 338                 break;
 339         case SND_SOC_DAIFMT_CBS_CFS:
 340                 break;
 341         default:
 342                 return -EINVAL;
 343         }
 344
 345         /* interface format */
 346         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 347         case SND_SOC_DAIFMT_I2S:
 348                 iface |= 0x0002;
 349                 break;
 350         case SND_SOC_DAIFMT_RIGHT_J:
 351                 break;
 352         case SND_SOC_DAIFMT_LEFT_J:
 353                 iface |= 0x0001;
 354                 break;
 355         case SND_SOC_DAIFMT_DSP_A:
 356                 iface |= 0x0003;
 357                 break;
 358         case SND_SOC_DAIFMT_DSP_B:
 359                 iface |= 0x0013;
 360                 break;
 361         default:
 362                 return -EINVAL;
 363         }
 364
 365         /* clock inversion */
 366         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 367         case SND_SOC_DAIFMT_NB_NF:
 368                 break;
 369         case SND_SOC_DAIFMT_IB_IF:
 370                 iface |= 0x0090;
 371                 break;
 372         case SND_SOC_DAIFMT_IB_NF:
 373                 iface |= 0x0080;
 374                 break;
 375         case SND_SOC_DAIFMT_NB_IF:
 376                 iface |= 0x0010;
 377                 break;
 378         default:
 379                 return -EINVAL;
 380         }
 381
 382         /* set iface */
 383         snd_soc_write(codec, WM8731_IFACE, iface);
 384         return 0;
 385 }
 386
 387 static int wm8731_set_bias_level(struct snd_soc_codec *codec,
 388                                  enum snd_soc_bias_level level)
 389 {
 390         struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
 391         int i, ret;
 392         u8 data[2];
 393         u16 *cache = codec->reg_cache;
 394         u16 reg;
 395
 396         switch (level) {
 397         case SND_SOC_BIAS_ON:
 398                 break;
 399         case SND_SOC_BIAS_PREPARE:
 400                 break;
 401         case SND_SOC_BIAS_STANDBY:
 402                 if (codec->bias_level == SND_SOC_BIAS_OFF) {
 403                         ret = regulator_bulk_enable(ARRAY_SIZE(wm8731->supplies),
 404                                                     wm8731->supplies);
 405                         if (ret != 0)
 406                                 return ret;
 407
 408                         /* Sync reg_cache with the hardware */
 409                         for (i = 0; i < ARRAY_SIZE(wm8731_reg); i++) {
 410                                 if (cache[i] == wm8731_reg[i])
 411                                         continue;
 412
 413                                 data[0] = (i << 1) | ((cache[i] >> 8)
 414                                                       & 0x0001);
 415                                 data[1] = cache[i] & 0x00ff;
 416                                 codec->hw_write(codec->control_data, data, 2);
 417                         }
 418                 }
 419
 420                 /* Clear PWROFF, gate CLKOUT, everything else as-is */
 421                 reg = snd_soc_read(codec, WM8731_PWR) & 0xff7f;
 422                 snd_soc_write(codec, WM8731_PWR, reg | 0x0040);
 423                 break;
 424         case SND_SOC_BIAS_OFF:
 425                 snd_soc_write(codec, WM8731_ACTIVE, 0x0);
 426                 snd_soc_write(codec, WM8731_PWR, 0xffff);
 427                 regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies),
 428                                        wm8731->supplies);
 429                 break;
 430         }
 431         codec->bias_level = level;
 432         return 0;
 433 }
 434
 435 #define WM8731_RATES SNDRV_PCM_RATE_8000_96000
 436
 437 #define WM8731_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
 438         SNDRV_PCM_FMTBIT_S24_LE)
 439
 440 static struct snd_soc_dai_ops wm8731_dai_ops = {
 441         .prepare        = wm8731_pcm_prepare,
 442         .hw_params      = wm8731_hw_params,
 443         .shutdown       = wm8731_shutdown,
 444         .digital_mute   = wm8731_mute,
 445         .set_sysclk     = wm8731_set_dai_sysclk,
 446         .set_fmt        = wm8731_set_dai_fmt,
 447 };
 448
 449 static struct snd_soc_dai_driver wm8731_dai = {
 450         .name = "wm8731-hifi",
 451         .playback = {
 452                 .stream_name = "Playback",
 453                 .channels_min = 1,
 454                 .channels_max = 2,
 455                 .rates = WM8731_RATES,
 456                 .formats = WM8731_FORMATS,},
 457         .capture = {
 458                 .stream_name = "Capture",
 459                 .channels_min = 1,
 460                 .channels_max = 2,
 461                 .rates = WM8731_RATES,
 462                 .formats = WM8731_FORMATS,},
 463         .ops = &wm8731_dai_ops,
 464         .symmetric_rates = 1,
 465 };
 466
 467 #ifdef CONFIG_PM
 468 static int wm8731_suspend(struct snd_soc_codec *codec, pm_message_t state)
 469 {
 470         wm8731_set_bias_level(codec, SND_SOC_BIAS_OFF);
 471
 472         return 0;
 473 }
 474
 475 static int wm8731_resume(struct snd_soc_codec *codec)
 476 {
 477         wm8731_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 478
 479         return 0;
 480 }
 481 #else
 482 #define wm8731_suspend NULL
 483 #define wm8731_resume NULL
 484 #endif
 485
 486 static int wm8731_probe(struct snd_soc_codec *codec)
 487 {
 488         struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
 489         int ret = 0, i;
 490
 491         ret = snd_soc_codec_set_cache_io(codec, 7, 9, wm8731->control_type);
 492         if (ret < 0) {
 493                 dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
 494                 return ret;
 495         }
 496
 497         for (i = 0; i < ARRAY_SIZE(wm8731->supplies); i++)
 498                 wm8731->supplies[i].supply = wm8731_supply_names[i];
 499
 500         ret = regulator_bulk_get(codec->dev, ARRAY_SIZE(wm8731->supplies),
 501                                  wm8731->supplies);
 502         if (ret != 0) {
 503                 dev_err(codec->dev, "Failed to request supplies: %d\n", ret);
 504                 return ret;
 505         }
 506
 507         ret = regulator_bulk_enable(ARRAY_SIZE(wm8731->supplies),
 508                                     wm8731->supplies);
 509         if (ret != 0) {
 510                 dev_err(codec->dev, "Failed to enable supplies: %d\n", ret);
 511                 goto err_regulator_get;
 512         }
 513
 514         ret = wm8731_reset(codec);
 515         if (ret < 0) {
 516                 dev_err(codec->dev, "Failed to issue reset: %d\n", ret);
 517                 goto err_regulator_enable;
 518         }
 519
 520         wm8731_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 521
 522         /* Latch the update bits */
 523         snd_soc_update_bits(codec, WM8731_LOUT1V, 0x100, 0);
 524         snd_soc_update_bits(codec, WM8731_ROUT1V, 0x100, 0);
 525         snd_soc_update_bits(codec, WM8731_LINVOL, 0x100, 0);
 526         snd_soc_update_bits(codec, WM8731_RINVOL, 0x100, 0);
 527
 528         /* Disable bypass path by default */
 529         snd_soc_update_bits(codec, WM8731_APANA, 0x8, 0);
 530
 531         snd_soc_add_controls(codec, wm8731_snd_controls,
 532                              ARRAY_SIZE(wm8731_snd_controls));
 533         wm8731_add_widgets(codec);
 534
 535         /* Regulators will have been enabled by bias management */
 536         regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);
 537
 538         return 0;
 539
 540 err_regulator_enable:
 541         regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);
 542 err_regulator_get:
 543         regulator_bulk_free(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);
 544
 545         kfree(wm8731);
 546         return ret;
 547 }
 548
 549 /* power down chip */
 550 static int wm8731_remove(struct snd_soc_codec *codec)
 551 {
 552         struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
 553
 554         wm8731_set_bias_level(codec, SND_SOC_BIAS_OFF);
 555
 556         regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);
 557         regulator_bulk_free(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);
 558
 559         return 0;
 560 }
 561
 562 static struct snd_soc_codec_driver soc_codec_dev_wm8731 = {
 563         .probe =        wm8731_probe,
 564         .remove =       wm8731_remove,
 565         .suspend =      wm8731_suspend,
 566         .resume =       wm8731_resume,
 567         .set_bias_level = wm8731_set_bias_level,
 568         .reg_cache_size = ARRAY_SIZE(wm8731_reg),
 569         .reg_word_size = sizeof(u16),
 570         .reg_cache_default = wm8731_reg,
 571 };
 572
 573 #if defined(CONFIG_SPI_MASTER)
 574 static int __devinit wm8731_spi_probe(struct spi_device *spi)
 575 {
 576         struct wm8731_priv *wm8731;
 577         int ret;
 578
 579         wm8731 = kzalloc(sizeof(struct wm8731_priv), GFP_KERNEL);
 580         if (wm8731 == NULL)
 581                 return -ENOMEM;
 582
 583         wm8731->control_type = SND_SOC_SPI;
 584         spi_set_drvdata(spi, wm8731);
 585
 586         ret = snd_soc_register_codec(&spi->dev,
 587                         &soc_codec_dev_wm8731, &wm8731_dai, 1);
 588         if (ret < 0)
 589                 kfree(wm8731);
 590         return ret;
 591 }
 592
 593 static int __devexit wm8731_spi_remove(struct spi_device *spi)
 594 {
 595         snd_soc_unregister_codec(&spi->dev);
 596         kfree(spi_get_drvdata(spi));
 597         return 0;
 598 }
 599
 600 static struct spi_driver wm8731_spi_driver = {
 601         .driver = {
 602                 .name   = "wm8731-codec",
 603                 .owner  = THIS_MODULE,
 604         },
 605         .probe          = wm8731_spi_probe,
 606         .remove         = __devexit_p(wm8731_spi_remove),
 607 };
 608 #endif /* CONFIG_SPI_MASTER */
 609
 610 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 611 static __devinit int wm8731_i2c_probe(struct i2c_client *i2c,
 612                                       const struct i2c_device_id *id)
 613 {
 614         struct wm8731_priv *wm8731;
 615         int ret;
 616
 617         wm8731 = kzalloc(sizeof(struct wm8731_priv), GFP_KERNEL);
 618         if (wm8731 == NULL)
 619                 return -ENOMEM;
 620
 621         i2c_set_clientdata(i2c, wm8731);
 622         wm8731->control_type = SND_SOC_I2C;
 623
 624         ret =  snd_soc_register_codec(&i2c->dev,
 625                         &soc_codec_dev_wm8731, &wm8731_dai, 1);
 626         if (ret < 0)
 627                 kfree(wm8731);
 628         return ret;
 629 }
 630
 631 static __devexit int wm8731_i2c_remove(struct i2c_client *client)
 632 {
 633         snd_soc_unregister_codec(&client->dev);
 634         kfree(i2c_get_clientdata(client));
 635         return 0;
 636 }
 637
 638 static const struct i2c_device_id wm8731_i2c_id[] = {
 639         { "wm8731", 0 },
 640         { }
 641 };
 642 MODULE_DEVICE_TABLE(i2c, wm8731_i2c_id);
 643
 644 static struct i2c_driver wm8731_i2c_driver = {
 645         .driver = {
 646                 .name = "wm8731-codec",
 647                 .owner = THIS_MODULE,
 648         },
 649         .probe =    wm8731_i2c_probe,
 650         .remove =   __devexit_p(wm8731_i2c_remove),
 651         .id_table = wm8731_i2c_id,
 652 };
 653 #endif
 654
 655 static int __init wm8731_modinit(void)
 656 {
 657         int ret = 0;
 658 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 659         ret = i2c_add_driver(&wm8731_i2c_driver);
 660         if (ret != 0) {
 661                 printk(KERN_ERR "Failed to register WM8731 I2C driver: %d\n",
 662                        ret);
 663         }
 664 #endif
 665 #if defined(CONFIG_SPI_MASTER)
 666         ret = spi_register_driver(&wm8731_spi_driver);
 667         if (ret != 0) {
 668                 printk(KERN_ERR "Failed to register WM8731 SPI driver: %d\n",
 669                        ret);
 670         }
 671 #endif
 672         return ret;
 673 }
 674 module_init(wm8731_modinit);
 675
 676 static void __exit wm8731_exit(void)
 677 {
 678 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 679         i2c_del_driver(&wm8731_i2c_driver);
 680 #endif
 681 #if defined(CONFIG_SPI_MASTER)
 682         spi_unregister_driver(&wm8731_spi_driver);
 683 #endif
 684 }
 685 module_exit(wm8731_exit);
 686
 687 MODULE_DESCRIPTION("ASoC WM8731 driver");
 688 MODULE_AUTHOR("Richard Purdie");
 689 MODULE_LICENSE("GPL");