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/spi/spi.h>
  23 #include <sound/core.h>
  24 #include <sound/pcm.h>
  25 #include <sound/pcm_params.h>
  26 #include <sound/soc.h>
  27 #include <sound/soc-dapm.h>
  28 #include <sound/initval.h>
  29
  30 #include "wm8731.h"
  31
  32 static struct snd_soc_codec *wm8731_codec;
  33 struct snd_soc_codec_device soc_codec_dev_wm8731;
  34
  35 /* codec private data */
  36 struct wm8731_priv {
  37         struct snd_soc_codec codec;
  38         u16 reg_cache[WM8731_CACHEREGNUM];
  39         unsigned int sysclk;
  40 };
  41
  42 #ifdef CONFIG_SPI_MASTER
  43 static int wm8731_spi_write(struct spi_device *spi, const char *data, int len);
  44 #endif
  45
  46 /*
  47  * wm8731 register cache
  48  * We can't read the WM8731 register space when we are
  49  * using 2 wire for device control, so we cache them instead.
  50  * There is no point in caching the reset register
  51  */
  52 static const u16 wm8731_reg[WM8731_CACHEREGNUM] = {
  53     0x0097, 0x0097, 0x0079, 0x0079,
  54     0x000a, 0x0008, 0x009f, 0x000a,
  55     0x0000, 0x0000
  56 };
  57
  58 /*
  59  * read wm8731 register cache
  60  */
  61 static inline unsigned int wm8731_read_reg_cache(struct snd_soc_codec *codec,
  62         unsigned int reg)
  63 {
  64         u16 *cache = codec->reg_cache;
  65         if (reg == WM8731_RESET)
  66                 return 0;
  67         if (reg >= WM8731_CACHEREGNUM)
  68                 return -1;
  69         return cache[reg];
  70 }
  71
  72 /*
  73  * write wm8731 register cache
  74  */
  75 static inline void wm8731_write_reg_cache(struct snd_soc_codec *codec,
  76         u16 reg, unsigned int value)
  77 {
  78         u16 *cache = codec->reg_cache;
  79         if (reg >= WM8731_CACHEREGNUM)
  80                 return;
  81         cache[reg] = value;
  82 }
  83
  84 /*
  85  * write to the WM8731 register space
  86  */
  87 static int wm8731_write(struct snd_soc_codec *codec, unsigned int reg,
  88         unsigned int value)
  89 {
  90         u8 data[2];
  91
  92         /* data is
  93          *   D15..D9 WM8731 register offset
  94          *   D8...D0 register data
  95          */
  96         data[0] = (reg << 1) | ((value >> 8) & 0x0001);
  97         data[1] = value & 0x00ff;
  98
  99         wm8731_write_reg_cache(codec, reg, value);
 100         if (codec->hw_write(codec->control_data, data, 2) == 2)
 101                 return 0;
 102         else
 103                 return -EIO;
 104 }
 105
 106 #define wm8731_reset(c) wm8731_write(c, WM8731_RESET, 0)
 107
 108 static const char *wm8731_input_select[] = {"Line In", "Mic"};
 109 static const char *wm8731_deemph[] = {"None", "32Khz", "44.1Khz", "48Khz"};
 110
 111 static const struct soc_enum wm8731_enum[] = {
 112         SOC_ENUM_SINGLE(WM8731_APANA, 2, 2, wm8731_input_select),
 113         SOC_ENUM_SINGLE(WM8731_APDIGI, 1, 4, wm8731_deemph),
 114 };
 115
 116 static const struct snd_kcontrol_new wm8731_snd_controls[] = {
 117
 118 SOC_DOUBLE_R("Master Playback Volume", WM8731_LOUT1V, WM8731_ROUT1V,
 119         0, 127, 0),
 120 SOC_DOUBLE_R("Master Playback ZC Switch", WM8731_LOUT1V, WM8731_ROUT1V,
 121         7, 1, 0),
 122
 123 SOC_DOUBLE_R("Capture Volume", WM8731_LINVOL, WM8731_RINVOL, 0, 31, 0),
 124 SOC_DOUBLE_R("Line Capture Switch", WM8731_LINVOL, WM8731_RINVOL, 7, 1, 1),
 125
 126 SOC_SINGLE("Mic Boost (+20dB)", WM8731_APANA, 0, 1, 0),
 127 SOC_SINGLE("Capture Mic Switch", WM8731_APANA, 1, 1, 1),
 128
 129 SOC_SINGLE("Sidetone Playback Volume", WM8731_APANA, 6, 3, 1),
 130
 131 SOC_SINGLE("ADC High Pass Filter Switch", WM8731_APDIGI, 0, 1, 1),
 132 SOC_SINGLE("Store DC Offset Switch", WM8731_APDIGI, 4, 1, 0),
 133
 134 SOC_ENUM("Playback De-emphasis", wm8731_enum[1]),
 135 };
 136
 137 /* Output Mixer */
 138 static const struct snd_kcontrol_new wm8731_output_mixer_controls[] = {
 139 SOC_DAPM_SINGLE("Line Bypass Switch", WM8731_APANA, 3, 1, 0),
 140 SOC_DAPM_SINGLE("Mic Sidetone Switch", WM8731_APANA, 5, 1, 0),
 141 SOC_DAPM_SINGLE("HiFi Playback Switch", WM8731_APANA, 4, 1, 0),
 142 };
 143
 144 /* Input mux */
 145 static const struct snd_kcontrol_new wm8731_input_mux_controls =
 146 SOC_DAPM_ENUM("Input Select", wm8731_enum[0]);
 147
 148 static const struct snd_soc_dapm_widget wm8731_dapm_widgets[] = {
 149 SND_SOC_DAPM_MIXER("Output Mixer", WM8731_PWR, 4, 1,
 150         &wm8731_output_mixer_controls[0],
 151         ARRAY_SIZE(wm8731_output_mixer_controls)),
 152 SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8731_PWR, 3, 1),
 153 SND_SOC_DAPM_OUTPUT("LOUT"),
 154 SND_SOC_DAPM_OUTPUT("LHPOUT"),
 155 SND_SOC_DAPM_OUTPUT("ROUT"),
 156 SND_SOC_DAPM_OUTPUT("RHPOUT"),
 157 SND_SOC_DAPM_ADC("ADC", "HiFi Capture", WM8731_PWR, 2, 1),
 158 SND_SOC_DAPM_MUX("Input Mux", SND_SOC_NOPM, 0, 0, &wm8731_input_mux_controls),
 159 SND_SOC_DAPM_PGA("Line Input", WM8731_PWR, 0, 1, NULL, 0),
 160 SND_SOC_DAPM_MICBIAS("Mic Bias", WM8731_PWR, 1, 1),
 161 SND_SOC_DAPM_INPUT("MICIN"),
 162 SND_SOC_DAPM_INPUT("RLINEIN"),
 163 SND_SOC_DAPM_INPUT("LLINEIN"),
 164 };
 165
 166 static const struct snd_soc_dapm_route intercon[] = {
 167         /* output mixer */
 168         {"Output Mixer", "Line Bypass Switch", "Line Input"},
 169         {"Output Mixer", "HiFi Playback Switch", "DAC"},
 170         {"Output Mixer", "Mic Sidetone Switch", "Mic Bias"},
 171
 172         /* outputs */
 173         {"RHPOUT", NULL, "Output Mixer"},
 174         {"ROUT", NULL, "Output Mixer"},
 175         {"LHPOUT", NULL, "Output Mixer"},
 176         {"LOUT", NULL, "Output Mixer"},
 177
 178         /* input mux */
 179         {"Input Mux", "Line In", "Line Input"},
 180         {"Input Mux", "Mic", "Mic Bias"},
 181         {"ADC", NULL, "Input Mux"},
 182
 183         /* inputs */
 184         {"Line Input", NULL, "LLINEIN"},
 185         {"Line Input", NULL, "RLINEIN"},
 186         {"Mic Bias", NULL, "MICIN"},
 187 };
 188
 189 static int wm8731_add_widgets(struct snd_soc_codec *codec)
 190 {
 191         snd_soc_dapm_new_controls(codec, wm8731_dapm_widgets,
 192                                   ARRAY_SIZE(wm8731_dapm_widgets));
 193
 194         snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));
 195
 196         snd_soc_dapm_new_widgets(codec);
 197         return 0;
 198 }
 199
 200 struct _coeff_div {
 201         u32 mclk;
 202         u32 rate;
 203         u16 fs;
 204         u8 sr:4;
 205         u8 bosr:1;
 206         u8 usb:1;
 207 };
 208
 209 /* codec mclk clock divider coefficients */
 210 static const struct _coeff_div coeff_div[] = {
 211         /* 48k */
 212         {12288000, 48000, 256, 0x0, 0x0, 0x0},
 213         {18432000, 48000, 384, 0x0, 0x1, 0x0},
 214         {12000000, 48000, 250, 0x0, 0x0, 0x1},
 215
 216         /* 32k */
 217         {12288000, 32000, 384, 0x6, 0x0, 0x0},
 218         {18432000, 32000, 576, 0x6, 0x1, 0x0},
 219         {12000000, 32000, 375, 0x6, 0x0, 0x1},
 220
 221         /* 8k */
 222         {12288000, 8000, 1536, 0x3, 0x0, 0x0},
 223         {18432000, 8000, 2304, 0x3, 0x1, 0x0},
 224         {11289600, 8000, 1408, 0xb, 0x0, 0x0},
 225         {16934400, 8000, 2112, 0xb, 0x1, 0x0},
 226         {12000000, 8000, 1500, 0x3, 0x0, 0x1},
 227
 228         /* 96k */
 229         {12288000, 96000, 128, 0x7, 0x0, 0x0},
 230         {18432000, 96000, 192, 0x7, 0x1, 0x0},
 231         {12000000, 96000, 125, 0x7, 0x0, 0x1},
 232
 233         /* 44.1k */
 234         {11289600, 44100, 256, 0x8, 0x0, 0x0},
 235         {16934400, 44100, 384, 0x8, 0x1, 0x0},
 236         {12000000, 44100, 272, 0x8, 0x1, 0x1},
 237
 238         /* 88.2k */
 239         {11289600, 88200, 128, 0xf, 0x0, 0x0},
 240         {16934400, 88200, 192, 0xf, 0x1, 0x0},
 241         {12000000, 88200, 136, 0xf, 0x1, 0x1},
 242 };
 243
 244 static inline int get_coeff(int mclk, int rate)
 245 {
 246         int i;
 247
 248         for (i = 0; i < ARRAY_SIZE(coeff_div); i++) {
 249                 if (coeff_div[i].rate == rate && coeff_div[i].mclk == mclk)
 250                         return i;
 251         }
 252         return 0;
 253 }
 254
 255 static int wm8731_hw_params(struct snd_pcm_substream *substream,
 256                             struct snd_pcm_hw_params *params,
 257                             struct snd_soc_dai *dai)
 258 {
 259         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 260         struct snd_soc_device *socdev = rtd->socdev;
 261         struct snd_soc_codec *codec = socdev->card->codec;
 262         struct wm8731_priv *wm8731 = codec->private_data;
 263         u16 iface = wm8731_read_reg_cache(codec, WM8731_IFACE) & 0xfff3;
 264         int i = get_coeff(wm8731->sysclk, params_rate(params));
 265         u16 srate = (coeff_div[i].sr << 2) |
 266                 (coeff_div[i].bosr << 1) | coeff_div[i].usb;
 267
 268         wm8731_write(codec, WM8731_SRATE, srate);
 269
 270         /* bit size */
 271         switch (params_format(params)) {
 272         case SNDRV_PCM_FORMAT_S16_LE:
 273                 break;
 274         case SNDRV_PCM_FORMAT_S20_3LE:
 275                 iface |= 0x0004;
 276                 break;
 277         case SNDRV_PCM_FORMAT_S24_LE:
 278                 iface |= 0x0008;
 279                 break;
 280         }
 281
 282         wm8731_write(codec, WM8731_IFACE, iface);
 283         return 0;
 284 }
 285
 286 static int wm8731_pcm_prepare(struct snd_pcm_substream *substream,
 287                               struct snd_soc_dai *dai)
 288 {
 289         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 290         struct snd_soc_device *socdev = rtd->socdev;
 291         struct snd_soc_codec *codec = socdev->card->codec;
 292
 293         /* set active */
 294         wm8731_write(codec, WM8731_ACTIVE, 0x0001);
 295
 296         return 0;
 297 }
 298
 299 static void wm8731_shutdown(struct snd_pcm_substream *substream,
 300                             struct snd_soc_dai *dai)
 301 {
 302         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 303         struct snd_soc_device *socdev = rtd->socdev;
 304         struct snd_soc_codec *codec = socdev->card->codec;
 305
 306         /* deactivate */
 307         if (!codec->active) {
 308                 udelay(50);
 309                 wm8731_write(codec, WM8731_ACTIVE, 0x0);
 310         }
 311 }
 312
 313 static int wm8731_mute(struct snd_soc_dai *dai, int mute)
 314 {
 315         struct snd_soc_codec *codec = dai->codec;
 316         u16 mute_reg = wm8731_read_reg_cache(codec, WM8731_APDIGI) & 0xfff7;
 317
 318         if (mute)
 319                 wm8731_write(codec, WM8731_APDIGI, mute_reg | 0x8);
 320         else
 321                 wm8731_write(codec, WM8731_APDIGI, mute_reg);
 322         return 0;
 323 }
 324
 325 static int wm8731_set_dai_sysclk(struct snd_soc_dai *codec_dai,
 326                 int clk_id, unsigned int freq, int dir)
 327 {
 328         struct snd_soc_codec *codec = codec_dai->codec;
 329         struct wm8731_priv *wm8731 = codec->private_data;
 330
 331         switch (freq) {
 332         case 11289600:
 333         case 12000000:
 334         case 12288000:
 335         case 16934400:
 336         case 18432000:
 337                 wm8731->sysclk = freq;
 338                 return 0;
 339         }
 340         return -EINVAL;
 341 }
 342
 343
 344 static int wm8731_set_dai_fmt(struct snd_soc_dai *codec_dai,
 345                 unsigned int fmt)
 346 {
 347         struct snd_soc_codec *codec = codec_dai->codec;
 348         u16 iface = 0;
 349
 350         /* set master/slave audio interface */
 351         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 352         case SND_SOC_DAIFMT_CBM_CFM:
 353                 iface |= 0x0040;
 354                 break;
 355         case SND_SOC_DAIFMT_CBS_CFS:
 356                 break;
 357         default:
 358                 return -EINVAL;
 359         }
 360
 361         /* interface format */
 362         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 363         case SND_SOC_DAIFMT_I2S:
 364                 iface |= 0x0002;
 365                 break;
 366         case SND_SOC_DAIFMT_RIGHT_J:
 367                 break;
 368         case SND_SOC_DAIFMT_LEFT_J:
 369                 iface |= 0x0001;
 370                 break;
 371         case SND_SOC_DAIFMT_DSP_A:
 372                 iface |= 0x0003;
 373                 break;
 374         case SND_SOC_DAIFMT_DSP_B:
 375                 iface |= 0x0013;
 376                 break;
 377         default:
 378                 return -EINVAL;
 379         }
 380
 381         /* clock inversion */
 382         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 383         case SND_SOC_DAIFMT_NB_NF:
 384                 break;
 385         case SND_SOC_DAIFMT_IB_IF:
 386                 iface |= 0x0090;
 387                 break;
 388         case SND_SOC_DAIFMT_IB_NF:
 389                 iface |= 0x0080;
 390                 break;
 391         case SND_SOC_DAIFMT_NB_IF:
 392                 iface |= 0x0010;
 393                 break;
 394         default:
 395                 return -EINVAL;
 396         }
 397
 398         /* set iface */
 399         wm8731_write(codec, WM8731_IFACE, iface);
 400         return 0;
 401 }
 402
 403 static int wm8731_set_bias_level(struct snd_soc_codec *codec,
 404                                  enum snd_soc_bias_level level)
 405 {
 406         u16 reg;
 407
 408         switch (level) {
 409         case SND_SOC_BIAS_ON:
 410                 break;
 411         case SND_SOC_BIAS_PREPARE:
 412                 break;
 413         case SND_SOC_BIAS_STANDBY:
 414                 /* Clear PWROFF, gate CLKOUT, everything else as-is */
 415                 reg = wm8731_read_reg_cache(codec, WM8731_PWR) & 0xff7f;
 416                 wm8731_write(codec, WM8731_PWR, reg | 0x0040);
 417                 break;
 418         case SND_SOC_BIAS_OFF:
 419                 wm8731_write(codec, WM8731_ACTIVE, 0x0);
 420                 wm8731_write(codec, WM8731_PWR, 0xffff);
 421                 break;
 422         }
 423         codec->bias_level = level;
 424         return 0;
 425 }
 426
 427 #define WM8731_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
 428                 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 |\
 429                 SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\
 430                 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |\
 431                 SNDRV_PCM_RATE_96000)
 432
 433 #define WM8731_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
 434         SNDRV_PCM_FMTBIT_S24_LE)
 435
 436 struct snd_soc_dai wm8731_dai = {
 437         .name = "WM8731",
 438         .playback = {
 439                 .stream_name = "Playback",
 440                 .channels_min = 1,
 441                 .channels_max = 2,
 442                 .rates = WM8731_RATES,
 443                 .formats = WM8731_FORMATS,},
 444         .capture = {
 445                 .stream_name = "Capture",
 446                 .channels_min = 1,
 447                 .channels_max = 2,
 448                 .rates = WM8731_RATES,
 449                 .formats = WM8731_FORMATS,},
 450         .ops = {
 451                 .prepare = wm8731_pcm_prepare,
 452                 .hw_params = wm8731_hw_params,
 453                 .shutdown = wm8731_shutdown,
 454                 .digital_mute = wm8731_mute,
 455                 .set_sysclk = wm8731_set_dai_sysclk,
 456                 .set_fmt = wm8731_set_dai_fmt,
 457         }
 458 };
 459 EXPORT_SYMBOL_GPL(wm8731_dai);
 460
 461 static int wm8731_suspend(struct platform_device *pdev, pm_message_t state)
 462 {
 463         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 464         struct snd_soc_codec *codec = socdev->card->codec;
 465
 466         wm8731_write(codec, WM8731_ACTIVE, 0x0);
 467         wm8731_set_bias_level(codec, SND_SOC_BIAS_OFF);
 468         return 0;
 469 }
 470
 471 static int wm8731_resume(struct platform_device *pdev)
 472 {
 473         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 474         struct snd_soc_codec *codec = socdev->card->codec;
 475         int i;
 476         u8 data[2];
 477         u16 *cache = codec->reg_cache;
 478
 479         /* Sync reg_cache with the hardware */
 480         for (i = 0; i < ARRAY_SIZE(wm8731_reg); i++) {
 481                 data[0] = (i << 1) | ((cache[i] >> 8) & 0x0001);
 482                 data[1] = cache[i] & 0x00ff;
 483                 codec->hw_write(codec->control_data, data, 2);
 484         }
 485         wm8731_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 486         wm8731_set_bias_level(codec, codec->suspend_bias_level);
 487         return 0;
 488 }
 489
 490 static int wm8731_probe(struct platform_device *pdev)
 491 {
 492         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 493         struct snd_soc_codec *codec;
 494         int ret = 0;
 495
 496         if (wm8731_codec == NULL) {
 497                 dev_err(&pdev->dev, "Codec device not registered\n");
 498                 return -ENODEV;
 499         }
 500
 501         socdev->card->codec = wm8731_codec;
 502         codec = wm8731_codec;
 503
 504         /* register pcms */
 505         ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
 506         if (ret < 0) {
 507                 dev_err(codec->dev, "failed to create pcms: %d\n", ret);
 508                 goto pcm_err;
 509         }
 510
 511         snd_soc_add_controls(codec, wm8731_snd_controls,
 512                              ARRAY_SIZE(wm8731_snd_controls));
 513         wm8731_add_widgets(codec);
 514         ret = snd_soc_init_card(socdev);
 515         if (ret < 0) {
 516                 dev_err(codec->dev, "failed to register card: %d\n", ret);
 517                 goto card_err;
 518         }
 519
 520         return ret;
 521
 522 card_err:
 523         snd_soc_free_pcms(socdev);
 524         snd_soc_dapm_free(socdev);
 525 pcm_err:
 526         return ret;
 527 }
 528
 529 /* power down chip */
 530 static int wm8731_remove(struct platform_device *pdev)
 531 {
 532         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 533
 534         snd_soc_free_pcms(socdev);
 535         snd_soc_dapm_free(socdev);
 536
 537         return 0;
 538 }
 539
 540 struct snd_soc_codec_device soc_codec_dev_wm8731 = {
 541         .probe =        wm8731_probe,
 542         .remove =       wm8731_remove,
 543         .suspend =      wm8731_suspend,
 544         .resume =       wm8731_resume,
 545 };
 546 EXPORT_SYMBOL_GPL(soc_codec_dev_wm8731);
 547
 548 static int wm8731_register(struct wm8731_priv *wm8731)
 549 {
 550         int ret;
 551         struct snd_soc_codec *codec = &wm8731->codec;
 552         u16 reg;
 553
 554         if (wm8731_codec) {
 555                 dev_err(codec->dev, "Another WM8731 is registered\n");
 556                 return -EINVAL;
 557         }
 558
 559         mutex_init(&codec->mutex);
 560         INIT_LIST_HEAD(&codec->dapm_widgets);
 561         INIT_LIST_HEAD(&codec->dapm_paths);
 562
 563         codec->private_data = wm8731;
 564         codec->name = "WM8731";
 565         codec->owner = THIS_MODULE;
 566         codec->read = wm8731_read_reg_cache;
 567         codec->write = wm8731_write;
 568         codec->bias_level = SND_SOC_BIAS_OFF;
 569         codec->set_bias_level = wm8731_set_bias_level;
 570         codec->dai = &wm8731_dai;
 571         codec->num_dai = 1;
 572         codec->reg_cache_size = WM8731_CACHEREGNUM;
 573         codec->reg_cache = &wm8731->reg_cache;
 574
 575         memcpy(codec->reg_cache, wm8731_reg, sizeof(wm8731_reg));
 576
 577         ret = wm8731_reset(codec);
 578         if (ret < 0) {
 579                 dev_err(codec->dev, "Failed to issue reset\n");
 580                 return ret;
 581         }
 582
 583         wm8731_dai.dev = codec->dev;
 584
 585         wm8731_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 586
 587         /* Latch the update bits */
 588         reg = wm8731_read_reg_cache(codec, WM8731_LOUT1V);
 589         wm8731_write(codec, WM8731_LOUT1V, reg & ~0x0100);
 590         reg = wm8731_read_reg_cache(codec, WM8731_ROUT1V);
 591         wm8731_write(codec, WM8731_ROUT1V, reg & ~0x0100);
 592         reg = wm8731_read_reg_cache(codec, WM8731_LINVOL);
 593         wm8731_write(codec, WM8731_LINVOL, reg & ~0x0100);
 594         reg = wm8731_read_reg_cache(codec, WM8731_RINVOL);
 595         wm8731_write(codec, WM8731_RINVOL, reg & ~0x0100);
 596
 597         /* Disable bypass path by default */
 598         reg = wm8731_read_reg_cache(codec, WM8731_APANA);
 599         wm8731_write(codec, WM8731_APANA, reg & ~0x4);
 600
 601         wm8731_codec = codec;
 602
 603         ret = snd_soc_register_codec(codec);
 604         if (ret != 0) {
 605                 dev_err(codec->dev, "Failed to register codec: %d\n", ret);
 606                 return ret;
 607         }
 608
 609         ret = snd_soc_register_dai(&wm8731_dai);
 610         if (ret != 0) {
 611                 dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
 612                 snd_soc_unregister_codec(codec);
 613                 return ret;
 614         }
 615
 616         return 0;
 617 }
 618
 619 static void wm8731_unregister(struct wm8731_priv *wm8731)
 620 {
 621         wm8731_set_bias_level(&wm8731->codec, SND_SOC_BIAS_OFF);
 622         snd_soc_unregister_dai(&wm8731_dai);
 623         snd_soc_unregister_codec(&wm8731->codec);
 624         kfree(wm8731);
 625         wm8731_codec = NULL;
 626 }
 627
 628 #if defined(CONFIG_SPI_MASTER)
 629 static int wm8731_spi_write(struct spi_device *spi, const char *data, int len)
 630 {
 631         struct spi_transfer t;
 632         struct spi_message m;
 633         u8 msg[2];
 634
 635         if (len <= 0)
 636                 return 0;
 637
 638         msg[0] = data[0];
 639         msg[1] = data[1];
 640
 641         spi_message_init(&m);
 642         memset(&t, 0, (sizeof t));
 643
 644         t.tx_buf = &msg[0];
 645         t.len = len;
 646
 647         spi_message_add_tail(&t, &m);
 648         spi_sync(spi, &m);
 649
 650         return len;
 651 }
 652
 653 static int __devinit wm8731_spi_probe(struct spi_device *spi)
 654 {
 655         struct snd_soc_codec *codec;
 656         struct wm8731_priv *wm8731;
 657
 658         wm8731 = kzalloc(sizeof(struct wm8731_priv), GFP_KERNEL);
 659         if (wm8731 == NULL)
 660                 return -ENOMEM;
 661
 662         codec = &wm8731->codec;
 663         codec->control_data = spi;
 664         codec->hw_write = (hw_write_t)wm8731_spi_write;
 665         codec->dev = &spi->dev;
 666
 667         spi->dev.driver_data = wm8731;
 668
 669         return wm8731_register(wm8731);
 670 }
 671
 672 static int __devexit wm8731_spi_remove(struct spi_device *spi)
 673 {
 674         struct wm8731_priv *wm8731 = spi->dev.driver_data;
 675
 676         wm8731_unregister(wm8731);
 677
 678         return 0;
 679 }
 680
 681 static struct spi_driver wm8731_spi_driver = {
 682         .driver = {
 683                 .name   = "wm8731",
 684                 .bus    = &spi_bus_type,
 685                 .owner  = THIS_MODULE,
 686         },
 687         .probe          = wm8731_spi_probe,
 688         .remove         = __devexit_p(wm8731_spi_remove),
 689 };
 690 #endif /* CONFIG_SPI_MASTER */
 691
 692 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 693 static __devinit int wm8731_i2c_probe(struct i2c_client *i2c,
 694                                       const struct i2c_device_id *id)
 695 {
 696         struct wm8731_priv *wm8731;
 697         struct snd_soc_codec *codec;
 698
 699         wm8731 = kzalloc(sizeof(struct wm8731_priv), GFP_KERNEL);
 700         if (wm8731 == NULL)
 701                 return -ENOMEM;
 702
 703         codec = &wm8731->codec;
 704         codec->hw_write = (hw_write_t)i2c_master_send;
 705
 706         i2c_set_clientdata(i2c, wm8731);
 707         codec->control_data = i2c;
 708
 709         codec->dev = &i2c->dev;
 710
 711         return wm8731_register(wm8731);
 712 }
 713
 714 static __devexit int wm8731_i2c_remove(struct i2c_client *client)
 715 {
 716         struct wm8731_priv *wm8731 = i2c_get_clientdata(client);
 717         wm8731_unregister(wm8731);
 718         return 0;
 719 }
 720
 721 static const struct i2c_device_id wm8731_i2c_id[] = {
 722         { "wm8731", 0 },
 723         { }
 724 };
 725 MODULE_DEVICE_TABLE(i2c, wm8731_i2c_id);
 726
 727 static struct i2c_driver wm8731_i2c_driver = {
 728         .driver = {
 729                 .name = "WM8731 I2C Codec",
 730                 .owner = THIS_MODULE,
 731         },
 732         .probe =    wm8731_i2c_probe,
 733         .remove =   __devexit_p(wm8731_i2c_remove),
 734         .id_table = wm8731_i2c_id,
 735 };
 736 #endif
 737
 738 static int __init wm8731_modinit(void)
 739 {
 740         int ret;
 741 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 742         ret = i2c_add_driver(&wm8731_i2c_driver);
 743         if (ret != 0) {
 744                 printk(KERN_ERR "Failed to register WM8731 I2C driver: %d\n",
 745                        ret);
 746         }
 747 #endif
 748 #if defined(CONFIG_SPI_MASTER)
 749         ret = spi_register_driver(&wm8731_spi_driver);
 750         if (ret != 0) {
 751                 printk(KERN_ERR "Failed to register WM8731 SPI driver: %d\n",
 752                        ret);
 753         }
 754 #endif
 755         return 0;
 756 }
 757 module_init(wm8731_modinit);
 758
 759 static void __exit wm8731_exit(void)
 760 {
 761 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 762         i2c_del_driver(&wm8731_i2c_driver);
 763 #endif
 764 #if defined(CONFIG_SPI_MASTER)
 765         spi_unregister_driver(&wm8731_spi_driver);
 766 #endif
 767 }
 768 module_exit(wm8731_exit);
 769
 770 MODULE_DESCRIPTION("ASoC WM8731 driver");
 771 MODULE_AUTHOR("Richard Purdie");
 772 MODULE_LICENSE("GPL");