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         struct snd_soc_dapm_context *dapm = &codec->dapm;
 169
 170         snd_soc_dapm_new_controls(dapm, wm8731_dapm_widgets,
 171                                   ARRAY_SIZE(wm8731_dapm_widgets));
 172         snd_soc_dapm_add_routes(dapm, intercon, ARRAY_SIZE(intercon));
 173
 174         return 0;
 175 }
 176
 177 struct _coeff_div {
 178         u32 mclk;
 179         u32 rate;
 180         u16 fs;
 181         u8 sr:4;
 182         u8 bosr:1;
 183         u8 usb:1;
 184 };
 185
 186 /* codec mclk clock divider coefficients */
 187 static const struct _coeff_div coeff_div[] = {
 188         /* 48k */
 189         {12288000, 48000, 256, 0x0, 0x0, 0x0},
 190         {18432000, 48000, 384, 0x0, 0x1, 0x0},
 191         {12000000, 48000, 250, 0x0, 0x0, 0x1},
 192
 193         /* 32k */
 194         {12288000, 32000, 384, 0x6, 0x0, 0x0},
 195         {18432000, 32000, 576, 0x6, 0x1, 0x0},
 196         {12000000, 32000, 375, 0x6, 0x0, 0x1},
 197
 198         /* 8k */
 199         {12288000, 8000, 1536, 0x3, 0x0, 0x0},
 200         {18432000, 8000, 2304, 0x3, 0x1, 0x0},
 201         {11289600, 8000, 1408, 0xb, 0x0, 0x0},
 202         {16934400, 8000, 2112, 0xb, 0x1, 0x0},
 203         {12000000, 8000, 1500, 0x3, 0x0, 0x1},
 204
 205         /* 96k */
 206         {12288000, 96000, 128, 0x7, 0x0, 0x0},
 207         {18432000, 96000, 192, 0x7, 0x1, 0x0},
 208         {12000000, 96000, 125, 0x7, 0x0, 0x1},
 209
 210         /* 44.1k */
 211         {11289600, 44100, 256, 0x8, 0x0, 0x0},
 212         {16934400, 44100, 384, 0x8, 0x1, 0x0},
 213         {12000000, 44100, 272, 0x8, 0x1, 0x1},
 214
 215         /* 88.2k */
 216         {11289600, 88200, 128, 0xf, 0x0, 0x0},
 217         {16934400, 88200, 192, 0xf, 0x1, 0x0},
 218         {12000000, 88200, 136, 0xf, 0x1, 0x1},
 219 };
 220
 221 static inline int get_coeff(int mclk, int rate)
 222 {
 223         int i;
 224
 225         for (i = 0; i < ARRAY_SIZE(coeff_div); i++) {
 226                 if (coeff_div[i].rate == rate && coeff_div[i].mclk == mclk)
 227                         return i;
 228         }
 229         return 0;
 230 }
 231
 232 static int wm8731_hw_params(struct snd_pcm_substream *substream,
 233                             struct snd_pcm_hw_params *params,
 234                             struct snd_soc_dai *dai)
 235 {
 236         struct snd_soc_codec *codec = dai->codec;
 237         struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
 238         u16 iface = snd_soc_read(codec, WM8731_IFACE) & 0xfff3;
 239         int i = get_coeff(wm8731->sysclk, params_rate(params));
 240         u16 srate = (coeff_div[i].sr << 2) |
 241                 (coeff_div[i].bosr << 1) | coeff_div[i].usb;
 242
 243         snd_soc_write(codec, WM8731_SRATE, srate);
 244
 245         /* bit size */
 246         switch (params_format(params)) {
 247         case SNDRV_PCM_FORMAT_S16_LE:
 248                 break;
 249         case SNDRV_PCM_FORMAT_S20_3LE:
 250                 iface |= 0x0004;
 251                 break;
 252         case SNDRV_PCM_FORMAT_S24_LE:
 253                 iface |= 0x0008;
 254                 break;
 255         }
 256
 257         snd_soc_write(codec, WM8731_IFACE, iface);
 258         return 0;
 259 }
 260
 261 static int wm8731_pcm_prepare(struct snd_pcm_substream *substream,
 262                               struct snd_soc_dai *dai)
 263 {
 264         struct snd_soc_codec *codec = dai->codec;
 265
 266         /* set active */
 267         snd_soc_write(codec, WM8731_ACTIVE, 0x0001);
 268
 269         return 0;
 270 }
 271
 272 static void wm8731_shutdown(struct snd_pcm_substream *substream,
 273                             struct snd_soc_dai *dai)
 274 {
 275         struct snd_soc_codec *codec = dai->codec;
 276
 277         /* deactivate */
 278         if (!codec->active) {
 279                 udelay(50);
 280                 snd_soc_write(codec, WM8731_ACTIVE, 0x0);
 281         }
 282 }
 283
 284 static int wm8731_mute(struct snd_soc_dai *dai, int mute)
 285 {
 286         struct snd_soc_codec *codec = dai->codec;
 287         u16 mute_reg = snd_soc_read(codec, WM8731_APDIGI) & 0xfff7;
 288
 289         if (mute)
 290                 snd_soc_write(codec, WM8731_APDIGI, mute_reg | 0x8);
 291         else
 292                 snd_soc_write(codec, WM8731_APDIGI, mute_reg);
 293         return 0;
 294 }
 295
 296 static int wm8731_set_dai_sysclk(struct snd_soc_dai *codec_dai,
 297                 int clk_id, unsigned int freq, int dir)
 298 {
 299         struct snd_soc_codec *codec = codec_dai->codec;
 300         struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
 301
 302         switch (clk_id) {
 303         case WM8731_SYSCLK_XTAL:
 304         case WM8731_SYSCLK_MCLK:
 305                 wm8731->sysclk_type = clk_id;
 306                 break;
 307         default:
 308                 return -EINVAL;
 309         }
 310
 311         switch (freq) {
 312         case 11289600:
 313         case 12000000:
 314         case 12288000:
 315         case 16934400:
 316         case 18432000:
 317                 wm8731->sysclk = freq;
 318                 break;
 319         default:
 320                 return -EINVAL;
 321         }
 322
 323         snd_soc_dapm_sync(&codec->dapm);
 324
 325         return 0;
 326 }
 327
 328
 329 static int wm8731_set_dai_fmt(struct snd_soc_dai *codec_dai,
 330                 unsigned int fmt)
 331 {
 332         struct snd_soc_codec *codec = codec_dai->codec;
 333         u16 iface = 0;
 334
 335         /* set master/slave audio interface */
 336         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 337         case SND_SOC_DAIFMT_CBM_CFM:
 338                 iface |= 0x0040;
 339                 break;
 340         case SND_SOC_DAIFMT_CBS_CFS:
 341                 break;
 342         default:
 343                 return -EINVAL;
 344         }
 345
 346         /* interface format */
 347         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 348         case SND_SOC_DAIFMT_I2S:
 349                 iface |= 0x0002;
 350                 break;
 351         case SND_SOC_DAIFMT_RIGHT_J:
 352                 break;
 353         case SND_SOC_DAIFMT_LEFT_J:
 354                 iface |= 0x0001;
 355                 break;
 356         case SND_SOC_DAIFMT_DSP_A:
 357                 iface |= 0x0003;
 358                 break;
 359         case SND_SOC_DAIFMT_DSP_B:
 360                 iface |= 0x0013;
 361                 break;
 362         default:
 363                 return -EINVAL;
 364         }
 365
 366         /* clock inversion */
 367         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 368         case SND_SOC_DAIFMT_NB_NF:
 369                 break;
 370         case SND_SOC_DAIFMT_IB_IF:
 371                 iface |= 0x0090;
 372                 break;
 373         case SND_SOC_DAIFMT_IB_NF:
 374                 iface |= 0x0080;
 375                 break;
 376         case SND_SOC_DAIFMT_NB_IF:
 377                 iface |= 0x0010;
 378                 break;
 379         default:
 380                 return -EINVAL;
 381         }
 382
 383         /* set iface */
 384         snd_soc_write(codec, WM8731_IFACE, iface);
 385         return 0;
 386 }
 387
 388 static int wm8731_set_bias_level(struct snd_soc_codec *codec,
 389                                  enum snd_soc_bias_level level)
 390 {
 391         struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
 392         int i, ret;
 393         u8 data[2];
 394         u16 *cache = codec->reg_cache;
 395         u16 reg;
 396
 397         switch (level) {
 398         case SND_SOC_BIAS_ON:
 399                 break;
 400         case SND_SOC_BIAS_PREPARE:
 401                 break;
 402         case SND_SOC_BIAS_STANDBY:
 403                 if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
 404                         ret = regulator_bulk_enable(ARRAY_SIZE(wm8731->supplies),
 405                                                     wm8731->supplies);
 406                         if (ret != 0)
 407                                 return ret;
 408
 409                         /* Sync reg_cache with the hardware */
 410                         for (i = 0; i < ARRAY_SIZE(wm8731_reg); i++) {
 411                                 if (cache[i] == wm8731_reg[i])
 412                                         continue;
 413
 414                                 data[0] = (i << 1) | ((cache[i] >> 8)
 415                                                       & 0x0001);
 416                                 data[1] = cache[i] & 0x00ff;
 417                                 codec->hw_write(codec->control_data, data, 2);
 418                         }
 419                 }
 420
 421                 /* Clear PWROFF, gate CLKOUT, everything else as-is */
 422                 reg = snd_soc_read(codec, WM8731_PWR) & 0xff7f;
 423                 snd_soc_write(codec, WM8731_PWR, reg | 0x0040);
 424                 break;
 425         case SND_SOC_BIAS_OFF:
 426                 snd_soc_write(codec, WM8731_ACTIVE, 0x0);
 427                 snd_soc_write(codec, WM8731_PWR, 0xffff);
 428                 regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies),
 429                                        wm8731->supplies);
 430                 break;
 431         }
 432         codec->dapm.bias_level = level;
 433         return 0;
 434 }
 435
 436 #define WM8731_RATES SNDRV_PCM_RATE_8000_96000
 437
 438 #define WM8731_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
 439         SNDRV_PCM_FMTBIT_S24_LE)
 440
 441 static struct snd_soc_dai_ops wm8731_dai_ops = {
 442         .prepare        = wm8731_pcm_prepare,
 443         .hw_params      = wm8731_hw_params,
 444         .shutdown       = wm8731_shutdown,
 445         .digital_mute   = wm8731_mute,
 446         .set_sysclk     = wm8731_set_dai_sysclk,
 447         .set_fmt        = wm8731_set_dai_fmt,
 448 };
 449
 450 static struct snd_soc_dai_driver wm8731_dai = {
 451         .name = "wm8731-hifi",
 452         .playback = {
 453                 .stream_name = "Playback",
 454                 .channels_min = 1,
 455                 .channels_max = 2,
 456                 .rates = WM8731_RATES,
 457                 .formats = WM8731_FORMATS,},
 458         .capture = {
 459                 .stream_name = "Capture",
 460                 .channels_min = 1,
 461                 .channels_max = 2,
 462                 .rates = WM8731_RATES,
 463                 .formats = WM8731_FORMATS,},
 464         .ops = &wm8731_dai_ops,
 465         .symmetric_rates = 1,
 466 };
 467
 468 #ifdef CONFIG_PM
 469 static int wm8731_suspend(struct snd_soc_codec *codec, pm_message_t state)
 470 {
 471         wm8731_set_bias_level(codec, SND_SOC_BIAS_OFF);
 472
 473         return 0;
 474 }
 475
 476 static int wm8731_resume(struct snd_soc_codec *codec)
 477 {
 478         wm8731_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 479
 480         return 0;
 481 }
 482 #else
 483 #define wm8731_suspend NULL
 484 #define wm8731_resume NULL
 485 #endif
 486
 487 static int wm8731_probe(struct snd_soc_codec *codec)
 488 {
 489         struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
 490         int ret = 0, i;
 491
 492         ret = snd_soc_codec_set_cache_io(codec, 7, 9, wm8731->control_type);
 493         if (ret < 0) {
 494                 dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
 495                 return ret;
 496         }
 497
 498         for (i = 0; i < ARRAY_SIZE(wm8731->supplies); i++)
 499                 wm8731->supplies[i].supply = wm8731_supply_names[i];
 500
 501         ret = regulator_bulk_get(codec->dev, ARRAY_SIZE(wm8731->supplies),
 502                                  wm8731->supplies);
 503         if (ret != 0) {
 504                 dev_err(codec->dev, "Failed to request supplies: %d\n", ret);
 505                 return ret;
 506         }
 507
 508         ret = regulator_bulk_enable(ARRAY_SIZE(wm8731->supplies),
 509                                     wm8731->supplies);
 510         if (ret != 0) {
 511                 dev_err(codec->dev, "Failed to enable supplies: %d\n", ret);
 512                 goto err_regulator_get;
 513         }
 514
 515         ret = wm8731_reset(codec);
 516         if (ret < 0) {
 517                 dev_err(codec->dev, "Failed to issue reset: %d\n", ret);
 518                 goto err_regulator_enable;
 519         }
 520
 521         wm8731_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 522
 523         /* Latch the update bits */
 524         snd_soc_update_bits(codec, WM8731_LOUT1V, 0x100, 0);
 525         snd_soc_update_bits(codec, WM8731_ROUT1V, 0x100, 0);
 526         snd_soc_update_bits(codec, WM8731_LINVOL, 0x100, 0);
 527         snd_soc_update_bits(codec, WM8731_RINVOL, 0x100, 0);
 528
 529         /* Disable bypass path by default */
 530         snd_soc_update_bits(codec, WM8731_APANA, 0x4, 0);
 531
 532         snd_soc_add_controls(codec, wm8731_snd_controls,
 533                              ARRAY_SIZE(wm8731_snd_controls));
 534         wm8731_add_widgets(codec);
 535
 536         /* Regulators will have been enabled by bias management */
 537         regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);
 538
 539         return 0;
 540
 541 err_regulator_enable:
 542         regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);
 543 err_regulator_get:
 544         regulator_bulk_free(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);
 545
 546         kfree(wm8731);
 547         return ret;
 548 }
 549
 550 /* power down chip */
 551 static int wm8731_remove(struct snd_soc_codec *codec)
 552 {
 553         struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec);
 554
 555         wm8731_set_bias_level(codec, SND_SOC_BIAS_OFF);
 556
 557         regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);
 558         regulator_bulk_free(ARRAY_SIZE(wm8731->supplies), wm8731->supplies);
 559
 560         return 0;
 561 }
 562
 563 static struct snd_soc_codec_driver soc_codec_dev_wm8731 = {
 564         .probe =        wm8731_probe,
 565         .remove =       wm8731_remove,
 566         .suspend =      wm8731_suspend,
 567         .resume =       wm8731_resume,
 568         .set_bias_level = wm8731_set_bias_level,
 569         .reg_cache_size = ARRAY_SIZE(wm8731_reg),
 570         .reg_word_size = sizeof(u16),
 571         .reg_cache_default = wm8731_reg,
 572 };
 573
 574 #if defined(CONFIG_SPI_MASTER)
 575 static int __devinit wm8731_spi_probe(struct spi_device *spi)
 576 {
 577         struct wm8731_priv *wm8731;
 578         int ret;
 579
 580         wm8731 = kzalloc(sizeof(struct wm8731_priv), GFP_KERNEL);
 581         if (wm8731 == NULL)
 582                 return -ENOMEM;
 583
 584         wm8731->control_type = SND_SOC_SPI;
 585         spi_set_drvdata(spi, wm8731);
 586
 587         ret = snd_soc_register_codec(&spi->dev,
 588                         &soc_codec_dev_wm8731, &wm8731_dai, 1);
 589         if (ret < 0)
 590                 kfree(wm8731);
 591         return ret;
 592 }
 593
 594 static int __devexit wm8731_spi_remove(struct spi_device *spi)
 595 {
 596         snd_soc_unregister_codec(&spi->dev);
 597         kfree(spi_get_drvdata(spi));
 598         return 0;
 599 }
 600
 601 static struct spi_driver wm8731_spi_driver = {
 602         .driver = {
 603                 .name   = "wm8731-codec",
 604                 .owner  = THIS_MODULE,
 605         },
 606         .probe          = wm8731_spi_probe,
 607         .remove         = __devexit_p(wm8731_spi_remove),
 608 };
 609 #endif /* CONFIG_SPI_MASTER */
 610
 611 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 612 static __devinit int wm8731_i2c_probe(struct i2c_client *i2c,
 613                                       const struct i2c_device_id *id)
 614 {
 615         struct wm8731_priv *wm8731;
 616         int ret;
 617
 618         wm8731 = kzalloc(sizeof(struct wm8731_priv), GFP_KERNEL);
 619         if (wm8731 == NULL)
 620                 return -ENOMEM;
 621
 622         i2c_set_clientdata(i2c, wm8731);
 623         wm8731->control_type = SND_SOC_I2C;
 624
 625         ret =  snd_soc_register_codec(&i2c->dev,
 626                         &soc_codec_dev_wm8731, &wm8731_dai, 1);
 627         if (ret < 0)
 628                 kfree(wm8731);
 629         return ret;
 630 }
 631
 632 static __devexit int wm8731_i2c_remove(struct i2c_client *client)
 633 {
 634         snd_soc_unregister_codec(&client->dev);
 635         kfree(i2c_get_clientdata(client));
 636         return 0;
 637 }
 638
 639 static const struct i2c_device_id wm8731_i2c_id[] = {
 640         { "wm8731", 0 },
 641         { }
 642 };
 643 MODULE_DEVICE_TABLE(i2c, wm8731_i2c_id);
 644
 645 static struct i2c_driver wm8731_i2c_driver = {
 646         .driver = {
 647                 .name = "wm8731-codec",
 648                 .owner = THIS_MODULE,
 649         },
 650         .probe =    wm8731_i2c_probe,
 651         .remove =   __devexit_p(wm8731_i2c_remove),
 652         .id_table = wm8731_i2c_id,
 653 };
 654 #endif
 655
 656 static int __init wm8731_modinit(void)
 657 {
 658         int ret = 0;
 659 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 660         ret = i2c_add_driver(&wm8731_i2c_driver);
 661         if (ret != 0) {
 662                 printk(KERN_ERR "Failed to register WM8731 I2C driver: %d\n",
 663                        ret);
 664         }
 665 #endif
 666 #if defined(CONFIG_SPI_MASTER)
 667         ret = spi_register_driver(&wm8731_spi_driver);
 668         if (ret != 0) {
 669                 printk(KERN_ERR "Failed to register WM8731 SPI driver: %d\n",
 670                        ret);
 671         }
 672 #endif
 673         return ret;
 674 }
 675 module_init(wm8731_modinit);
 676
 677 static void __exit wm8731_exit(void)
 678 {
 679 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 680         i2c_del_driver(&wm8731_i2c_driver);
 681 #endif
 682 #if defined(CONFIG_SPI_MASTER)
 683         spi_unregister_driver(&wm8731_spi_driver);
 684 #endif
 685 }
 686 module_exit(wm8731_exit);
 687
 688 MODULE_DESCRIPTION("ASoC WM8731 driver");
 689 MODULE_AUTHOR("Richard Purdie");
 690 MODULE_LICENSE("GPL");