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 #define wm8731_reset(c) snd_soc_write(c, WM8731_RESET, 0)
  59
  60 static const char *wm8731_input_select[] = {"Line In", "Mic"};
  61 static const char *wm8731_deemph[] = {"None", "32Khz", "44.1Khz", "48Khz"};
  62
  63 static const struct soc_enum wm8731_enum[] = {
  64         SOC_ENUM_SINGLE(WM8731_APANA, 2, 2, wm8731_input_select),
  65         SOC_ENUM_SINGLE(WM8731_APDIGI, 1, 4, wm8731_deemph),
  66 };
  67
  68 static const struct snd_kcontrol_new wm8731_snd_controls[] = {
  69
  70 SOC_DOUBLE_R("Master Playback Volume", WM8731_LOUT1V, WM8731_ROUT1V,
  71         0, 127, 0),
  72 SOC_DOUBLE_R("Master Playback ZC Switch", WM8731_LOUT1V, WM8731_ROUT1V,
  73         7, 1, 0),
  74
  75 SOC_DOUBLE_R("Capture Volume", WM8731_LINVOL, WM8731_RINVOL, 0, 31, 0),
  76 SOC_DOUBLE_R("Line Capture Switch", WM8731_LINVOL, WM8731_RINVOL, 7, 1, 1),
  77
  78 SOC_SINGLE("Mic Boost (+20dB)", WM8731_APANA, 0, 1, 0),
  79 SOC_SINGLE("Capture Mic Switch", WM8731_APANA, 1, 1, 1),
  80
  81 SOC_SINGLE("Sidetone Playback Volume", WM8731_APANA, 6, 3, 1),
  82
  83 SOC_SINGLE("ADC High Pass Filter Switch", WM8731_APDIGI, 0, 1, 1),
  84 SOC_SINGLE("Store DC Offset Switch", WM8731_APDIGI, 4, 1, 0),
  85
  86 SOC_ENUM("Playback De-emphasis", wm8731_enum[1]),
  87 };
  88
  89 /* Output Mixer */
  90 static const struct snd_kcontrol_new wm8731_output_mixer_controls[] = {
  91 SOC_DAPM_SINGLE("Line Bypass Switch", WM8731_APANA, 3, 1, 0),
  92 SOC_DAPM_SINGLE("Mic Sidetone Switch", WM8731_APANA, 5, 1, 0),
  93 SOC_DAPM_SINGLE("HiFi Playback Switch", WM8731_APANA, 4, 1, 0),
  94 };
  95
  96 /* Input mux */
  97 static const struct snd_kcontrol_new wm8731_input_mux_controls =
  98 SOC_DAPM_ENUM("Input Select", wm8731_enum[0]);
  99
 100 static const struct snd_soc_dapm_widget wm8731_dapm_widgets[] = {
 101 SND_SOC_DAPM_MIXER("Output Mixer", WM8731_PWR, 4, 1,
 102         &wm8731_output_mixer_controls[0],
 103         ARRAY_SIZE(wm8731_output_mixer_controls)),
 104 SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8731_PWR, 3, 1),
 105 SND_SOC_DAPM_OUTPUT("LOUT"),
 106 SND_SOC_DAPM_OUTPUT("LHPOUT"),
 107 SND_SOC_DAPM_OUTPUT("ROUT"),
 108 SND_SOC_DAPM_OUTPUT("RHPOUT"),
 109 SND_SOC_DAPM_ADC("ADC", "HiFi Capture", WM8731_PWR, 2, 1),
 110 SND_SOC_DAPM_MUX("Input Mux", SND_SOC_NOPM, 0, 0, &wm8731_input_mux_controls),
 111 SND_SOC_DAPM_PGA("Line Input", WM8731_PWR, 0, 1, NULL, 0),
 112 SND_SOC_DAPM_MICBIAS("Mic Bias", WM8731_PWR, 1, 1),
 113 SND_SOC_DAPM_INPUT("MICIN"),
 114 SND_SOC_DAPM_INPUT("RLINEIN"),
 115 SND_SOC_DAPM_INPUT("LLINEIN"),
 116 };
 117
 118 static const struct snd_soc_dapm_route intercon[] = {
 119         /* output mixer */
 120         {"Output Mixer", "Line Bypass Switch", "Line Input"},
 121         {"Output Mixer", "HiFi Playback Switch", "DAC"},
 122         {"Output Mixer", "Mic Sidetone Switch", "Mic Bias"},
 123
 124         /* outputs */
 125         {"RHPOUT", NULL, "Output Mixer"},
 126         {"ROUT", NULL, "Output Mixer"},
 127         {"LHPOUT", NULL, "Output Mixer"},
 128         {"LOUT", NULL, "Output Mixer"},
 129
 130         /* input mux */
 131         {"Input Mux", "Line In", "Line Input"},
 132         {"Input Mux", "Mic", "Mic Bias"},
 133         {"ADC", NULL, "Input Mux"},
 134
 135         /* inputs */
 136         {"Line Input", NULL, "LLINEIN"},
 137         {"Line Input", NULL, "RLINEIN"},
 138         {"Mic Bias", NULL, "MICIN"},
 139 };
 140
 141 static int wm8731_add_widgets(struct snd_soc_codec *codec)
 142 {
 143         snd_soc_dapm_new_controls(codec, wm8731_dapm_widgets,
 144                                   ARRAY_SIZE(wm8731_dapm_widgets));
 145
 146         snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));
 147
 148         snd_soc_dapm_new_widgets(codec);
 149         return 0;
 150 }
 151
 152 struct _coeff_div {
 153         u32 mclk;
 154         u32 rate;
 155         u16 fs;
 156         u8 sr:4;
 157         u8 bosr:1;
 158         u8 usb:1;
 159 };
 160
 161 /* codec mclk clock divider coefficients */
 162 static const struct _coeff_div coeff_div[] = {
 163         /* 48k */
 164         {12288000, 48000, 256, 0x0, 0x0, 0x0},
 165         {18432000, 48000, 384, 0x0, 0x1, 0x0},
 166         {12000000, 48000, 250, 0x0, 0x0, 0x1},
 167
 168         /* 32k */
 169         {12288000, 32000, 384, 0x6, 0x0, 0x0},
 170         {18432000, 32000, 576, 0x6, 0x1, 0x0},
 171         {12000000, 32000, 375, 0x6, 0x0, 0x1},
 172
 173         /* 8k */
 174         {12288000, 8000, 1536, 0x3, 0x0, 0x0},
 175         {18432000, 8000, 2304, 0x3, 0x1, 0x0},
 176         {11289600, 8000, 1408, 0xb, 0x0, 0x0},
 177         {16934400, 8000, 2112, 0xb, 0x1, 0x0},
 178         {12000000, 8000, 1500, 0x3, 0x0, 0x1},
 179
 180         /* 96k */
 181         {12288000, 96000, 128, 0x7, 0x0, 0x0},
 182         {18432000, 96000, 192, 0x7, 0x1, 0x0},
 183         {12000000, 96000, 125, 0x7, 0x0, 0x1},
 184
 185         /* 44.1k */
 186         {11289600, 44100, 256, 0x8, 0x0, 0x0},
 187         {16934400, 44100, 384, 0x8, 0x1, 0x0},
 188         {12000000, 44100, 272, 0x8, 0x1, 0x1},
 189
 190         /* 88.2k */
 191         {11289600, 88200, 128, 0xf, 0x0, 0x0},
 192         {16934400, 88200, 192, 0xf, 0x1, 0x0},
 193         {12000000, 88200, 136, 0xf, 0x1, 0x1},
 194 };
 195
 196 static inline int get_coeff(int mclk, int rate)
 197 {
 198         int i;
 199
 200         for (i = 0; i < ARRAY_SIZE(coeff_div); i++) {
 201                 if (coeff_div[i].rate == rate && coeff_div[i].mclk == mclk)
 202                         return i;
 203         }
 204         return 0;
 205 }
 206
 207 static int wm8731_hw_params(struct snd_pcm_substream *substream,
 208                             struct snd_pcm_hw_params *params,
 209                             struct snd_soc_dai *dai)
 210 {
 211         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 212         struct snd_soc_device *socdev = rtd->socdev;
 213         struct snd_soc_codec *codec = socdev->card->codec;
 214         struct wm8731_priv *wm8731 = codec->private_data;
 215         u16 iface = snd_soc_read(codec, WM8731_IFACE) & 0xfff3;
 216         int i = get_coeff(wm8731->sysclk, params_rate(params));
 217         u16 srate = (coeff_div[i].sr << 2) |
 218                 (coeff_div[i].bosr << 1) | coeff_div[i].usb;
 219
 220         snd_soc_write(codec, WM8731_SRATE, srate);
 221
 222         /* bit size */
 223         switch (params_format(params)) {
 224         case SNDRV_PCM_FORMAT_S16_LE:
 225                 break;
 226         case SNDRV_PCM_FORMAT_S20_3LE:
 227                 iface |= 0x0004;
 228                 break;
 229         case SNDRV_PCM_FORMAT_S24_LE:
 230                 iface |= 0x0008;
 231                 break;
 232         }
 233
 234         snd_soc_write(codec, WM8731_IFACE, iface);
 235         return 0;
 236 }
 237
 238 static int wm8731_pcm_prepare(struct snd_pcm_substream *substream,
 239                               struct snd_soc_dai *dai)
 240 {
 241         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 242         struct snd_soc_device *socdev = rtd->socdev;
 243         struct snd_soc_codec *codec = socdev->card->codec;
 244
 245         /* set active */
 246         snd_soc_write(codec, WM8731_ACTIVE, 0x0001);
 247
 248         return 0;
 249 }
 250
 251 static void wm8731_shutdown(struct snd_pcm_substream *substream,
 252                             struct snd_soc_dai *dai)
 253 {
 254         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 255         struct snd_soc_device *socdev = rtd->socdev;
 256         struct snd_soc_codec *codec = socdev->card->codec;
 257
 258         /* deactivate */
 259         if (!codec->active) {
 260                 udelay(50);
 261                 snd_soc_write(codec, WM8731_ACTIVE, 0x0);
 262         }
 263 }
 264
 265 static int wm8731_mute(struct snd_soc_dai *dai, int mute)
 266 {
 267         struct snd_soc_codec *codec = dai->codec;
 268         u16 mute_reg = snd_soc_read(codec, WM8731_APDIGI) & 0xfff7;
 269
 270         if (mute)
 271                 snd_soc_write(codec, WM8731_APDIGI, mute_reg | 0x8);
 272         else
 273                 snd_soc_write(codec, WM8731_APDIGI, mute_reg);
 274         return 0;
 275 }
 276
 277 static int wm8731_set_dai_sysclk(struct snd_soc_dai *codec_dai,
 278                 int clk_id, unsigned int freq, int dir)
 279 {
 280         struct snd_soc_codec *codec = codec_dai->codec;
 281         struct wm8731_priv *wm8731 = codec->private_data;
 282
 283         switch (freq) {
 284         case 11289600:
 285         case 12000000:
 286         case 12288000:
 287         case 16934400:
 288         case 18432000:
 289                 wm8731->sysclk = freq;
 290                 return 0;
 291         }
 292         return -EINVAL;
 293 }
 294
 295
 296 static int wm8731_set_dai_fmt(struct snd_soc_dai *codec_dai,
 297                 unsigned int fmt)
 298 {
 299         struct snd_soc_codec *codec = codec_dai->codec;
 300         u16 iface = 0;
 301
 302         /* set master/slave audio interface */
 303         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 304         case SND_SOC_DAIFMT_CBM_CFM:
 305                 iface |= 0x0040;
 306                 break;
 307         case SND_SOC_DAIFMT_CBS_CFS:
 308                 break;
 309         default:
 310                 return -EINVAL;
 311         }
 312
 313         /* interface format */
 314         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 315         case SND_SOC_DAIFMT_I2S:
 316                 iface |= 0x0002;
 317                 break;
 318         case SND_SOC_DAIFMT_RIGHT_J:
 319                 break;
 320         case SND_SOC_DAIFMT_LEFT_J:
 321                 iface |= 0x0001;
 322                 break;
 323         case SND_SOC_DAIFMT_DSP_A:
 324                 iface |= 0x0003;
 325                 break;
 326         case SND_SOC_DAIFMT_DSP_B:
 327                 iface |= 0x0013;
 328                 break;
 329         default:
 330                 return -EINVAL;
 331         }
 332
 333         /* clock inversion */
 334         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 335         case SND_SOC_DAIFMT_NB_NF:
 336                 break;
 337         case SND_SOC_DAIFMT_IB_IF:
 338                 iface |= 0x0090;
 339                 break;
 340         case SND_SOC_DAIFMT_IB_NF:
 341                 iface |= 0x0080;
 342                 break;
 343         case SND_SOC_DAIFMT_NB_IF:
 344                 iface |= 0x0010;
 345                 break;
 346         default:
 347                 return -EINVAL;
 348         }
 349
 350         /* set iface */
 351         snd_soc_write(codec, WM8731_IFACE, iface);
 352         return 0;
 353 }
 354
 355 static int wm8731_set_bias_level(struct snd_soc_codec *codec,
 356                                  enum snd_soc_bias_level level)
 357 {
 358         u16 reg;
 359
 360         switch (level) {
 361         case SND_SOC_BIAS_ON:
 362                 break;
 363         case SND_SOC_BIAS_PREPARE:
 364                 break;
 365         case SND_SOC_BIAS_STANDBY:
 366                 /* Clear PWROFF, gate CLKOUT, everything else as-is */
 367                 reg = snd_soc_read(codec, WM8731_PWR) & 0xff7f;
 368                 snd_soc_write(codec, WM8731_PWR, reg | 0x0040);
 369                 break;
 370         case SND_SOC_BIAS_OFF:
 371                 snd_soc_write(codec, WM8731_ACTIVE, 0x0);
 372                 snd_soc_write(codec, WM8731_PWR, 0xffff);
 373                 break;
 374         }
 375         codec->bias_level = level;
 376         return 0;
 377 }
 378
 379 #define WM8731_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
 380                 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 |\
 381                 SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\
 382                 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |\
 383                 SNDRV_PCM_RATE_96000)
 384
 385 #define WM8731_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
 386         SNDRV_PCM_FMTBIT_S24_LE)
 387
 388 static struct snd_soc_dai_ops wm8731_dai_ops = {
 389         .prepare        = wm8731_pcm_prepare,
 390         .hw_params      = wm8731_hw_params,
 391         .shutdown       = wm8731_shutdown,
 392         .digital_mute   = wm8731_mute,
 393         .set_sysclk     = wm8731_set_dai_sysclk,
 394         .set_fmt        = wm8731_set_dai_fmt,
 395 };
 396
 397 struct snd_soc_dai wm8731_dai = {
 398         .name = "WM8731",
 399         .playback = {
 400                 .stream_name = "Playback",
 401                 .channels_min = 1,
 402                 .channels_max = 2,
 403                 .rates = WM8731_RATES,
 404                 .formats = WM8731_FORMATS,},
 405         .capture = {
 406                 .stream_name = "Capture",
 407                 .channels_min = 1,
 408                 .channels_max = 2,
 409                 .rates = WM8731_RATES,
 410                 .formats = WM8731_FORMATS,},
 411         .ops = &wm8731_dai_ops,
 412 };
 413 EXPORT_SYMBOL_GPL(wm8731_dai);
 414
 415 #ifdef CONFIG_PM
 416 static int wm8731_suspend(struct platform_device *pdev, pm_message_t state)
 417 {
 418         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 419         struct snd_soc_codec *codec = socdev->card->codec;
 420
 421         snd_soc_write(codec, WM8731_ACTIVE, 0x0);
 422         wm8731_set_bias_level(codec, SND_SOC_BIAS_OFF);
 423         return 0;
 424 }
 425
 426 static int wm8731_resume(struct platform_device *pdev)
 427 {
 428         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 429         struct snd_soc_codec *codec = socdev->card->codec;
 430         int i;
 431         u8 data[2];
 432         u16 *cache = codec->reg_cache;
 433
 434         /* Sync reg_cache with the hardware */
 435         for (i = 0; i < ARRAY_SIZE(wm8731_reg); i++) {
 436                 data[0] = (i << 1) | ((cache[i] >> 8) & 0x0001);
 437                 data[1] = cache[i] & 0x00ff;
 438                 codec->hw_write(codec->control_data, data, 2);
 439         }
 440         wm8731_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 441         wm8731_set_bias_level(codec, codec->suspend_bias_level);
 442         return 0;
 443 }
 444 #else
 445 #define wm8731_suspend NULL
 446 #define wm8731_resume NULL
 447 #endif
 448
 449 static int wm8731_probe(struct platform_device *pdev)
 450 {
 451         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 452         struct snd_soc_codec *codec;
 453         int ret = 0;
 454
 455         if (wm8731_codec == NULL) {
 456                 dev_err(&pdev->dev, "Codec device not registered\n");
 457                 return -ENODEV;
 458         }
 459
 460         socdev->card->codec = wm8731_codec;
 461         codec = wm8731_codec;
 462
 463         /* register pcms */
 464         ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
 465         if (ret < 0) {
 466                 dev_err(codec->dev, "failed to create pcms: %d\n", ret);
 467                 goto pcm_err;
 468         }
 469
 470         snd_soc_add_controls(codec, wm8731_snd_controls,
 471                              ARRAY_SIZE(wm8731_snd_controls));
 472         wm8731_add_widgets(codec);
 473         ret = snd_soc_init_card(socdev);
 474         if (ret < 0) {
 475                 dev_err(codec->dev, "failed to register card: %d\n", ret);
 476                 goto card_err;
 477         }
 478
 479         return ret;
 480
 481 card_err:
 482         snd_soc_free_pcms(socdev);
 483         snd_soc_dapm_free(socdev);
 484 pcm_err:
 485         return ret;
 486 }
 487
 488 /* power down chip */
 489 static int wm8731_remove(struct platform_device *pdev)
 490 {
 491         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 492
 493         snd_soc_free_pcms(socdev);
 494         snd_soc_dapm_free(socdev);
 495
 496         return 0;
 497 }
 498
 499 struct snd_soc_codec_device soc_codec_dev_wm8731 = {
 500         .probe =        wm8731_probe,
 501         .remove =       wm8731_remove,
 502         .suspend =      wm8731_suspend,
 503         .resume =       wm8731_resume,
 504 };
 505 EXPORT_SYMBOL_GPL(soc_codec_dev_wm8731);
 506
 507 static int wm8731_register(struct wm8731_priv *wm8731,
 508                            enum snd_soc_control_type control)
 509 {
 510         int ret;
 511         struct snd_soc_codec *codec = &wm8731->codec;
 512
 513         if (wm8731_codec) {
 514                 dev_err(codec->dev, "Another WM8731 is registered\n");
 515                 ret = -EINVAL;
 516                 goto err;
 517         }
 518
 519         mutex_init(&codec->mutex);
 520         INIT_LIST_HEAD(&codec->dapm_widgets);
 521         INIT_LIST_HEAD(&codec->dapm_paths);
 522
 523         codec->private_data = wm8731;
 524         codec->name = "WM8731";
 525         codec->owner = THIS_MODULE;
 526         codec->bias_level = SND_SOC_BIAS_OFF;
 527         codec->set_bias_level = wm8731_set_bias_level;
 528         codec->dai = &wm8731_dai;
 529         codec->num_dai = 1;
 530         codec->reg_cache_size = WM8731_CACHEREGNUM;
 531         codec->reg_cache = &wm8731->reg_cache;
 532
 533         memcpy(codec->reg_cache, wm8731_reg, sizeof(wm8731_reg));
 534
 535         ret = snd_soc_codec_set_cache_io(codec, 7, 9, control);
 536         if (ret < 0) {
 537                 dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
 538                 goto err;
 539         }
 540
 541         ret = wm8731_reset(codec);
 542         if (ret < 0) {
 543                 dev_err(codec->dev, "Failed to issue reset: %d\n", ret);
 544                 goto err;
 545         }
 546
 547         wm8731_dai.dev = codec->dev;
 548
 549         wm8731_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 550
 551         /* Latch the update bits */
 552         snd_soc_update_bits(codec, WM8731_LOUT1V, 0x100, 0);
 553         snd_soc_update_bits(codec, WM8731_ROUT1V, 0x100, 0);
 554         snd_soc_update_bits(codec, WM8731_LINVOL, 0x100, 0);
 555         snd_soc_update_bits(codec, WM8731_RINVOL, 0x100, 0);
 556
 557         /* Disable bypass path by default */
 558         snd_soc_update_bits(codec, WM8731_APANA, 0x4, 0);
 559
 560         wm8731_codec = codec;
 561
 562         ret = snd_soc_register_codec(codec);
 563         if (ret != 0) {
 564                 dev_err(codec->dev, "Failed to register codec: %d\n", ret);
 565                 goto err;
 566         }
 567
 568         ret = snd_soc_register_dai(&wm8731_dai);
 569         if (ret != 0) {
 570                 dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
 571                 snd_soc_unregister_codec(codec);
 572                 goto err_codec;
 573         }
 574
 575         return 0;
 576
 577 err_codec:
 578         snd_soc_unregister_codec(codec);
 579 err:
 580         kfree(wm8731);
 581         return ret;
 582 }
 583
 584 static void wm8731_unregister(struct wm8731_priv *wm8731)
 585 {
 586         wm8731_set_bias_level(&wm8731->codec, SND_SOC_BIAS_OFF);
 587         snd_soc_unregister_dai(&wm8731_dai);
 588         snd_soc_unregister_codec(&wm8731->codec);
 589         kfree(wm8731);
 590         wm8731_codec = NULL;
 591 }
 592
 593 #if defined(CONFIG_SPI_MASTER)
 594 static int wm8731_spi_write(struct spi_device *spi, const char *data, int len)
 595 {
 596         struct spi_transfer t;
 597         struct spi_message m;
 598         u8 msg[2];
 599
 600         if (len <= 0)
 601                 return 0;
 602
 603         msg[0] = data[0];
 604         msg[1] = data[1];
 605
 606         spi_message_init(&m);
 607         memset(&t, 0, (sizeof t));
 608
 609         t.tx_buf = &msg[0];
 610         t.len = len;
 611
 612         spi_message_add_tail(&t, &m);
 613         spi_sync(spi, &m);
 614
 615         return len;
 616 }
 617
 618 static int __devinit wm8731_spi_probe(struct spi_device *spi)
 619 {
 620         struct snd_soc_codec *codec;
 621         struct wm8731_priv *wm8731;
 622
 623         wm8731 = kzalloc(sizeof(struct wm8731_priv), GFP_KERNEL);
 624         if (wm8731 == NULL)
 625                 return -ENOMEM;
 626
 627         codec = &wm8731->codec;
 628         codec->control_data = spi;
 629         codec->hw_write = (hw_write_t)wm8731_spi_write;
 630         codec->dev = &spi->dev;
 631
 632         dev_set_drvdata(&spi->dev, wm8731);
 633
 634         return wm8731_register(wm8731, SND_SOC_SPI);
 635 }
 636
 637 static int __devexit wm8731_spi_remove(struct spi_device *spi)
 638 {
 639         struct wm8731_priv *wm8731 = dev_get_drvdata(&spi->dev);
 640
 641         wm8731_unregister(wm8731);
 642
 643         return 0;
 644 }
 645
 646 #ifdef CONFIG_PM
 647 static int wm8731_spi_suspend(struct spi_device *spi, pm_message_t msg)
 648 {
 649         return snd_soc_suspend_device(&spi->dev);
 650 }
 651
 652 static int wm8731_spi_resume(struct spi_device *spi)
 653 {
 654         return snd_soc_resume_device(&spi->dev);
 655 }
 656 #else
 657 #define wm8731_spi_suspend NULL
 658 #define wm8731_spi_resume NULL
 659 #endif
 660
 661 static struct spi_driver wm8731_spi_driver = {
 662         .driver = {
 663                 .name   = "wm8731",
 664                 .bus    = &spi_bus_type,
 665                 .owner  = THIS_MODULE,
 666         },
 667         .probe          = wm8731_spi_probe,
 668         .suspend        = wm8731_spi_suspend,
 669         .resume         = wm8731_spi_resume,
 670         .remove         = __devexit_p(wm8731_spi_remove),
 671 };
 672 #endif /* CONFIG_SPI_MASTER */
 673
 674 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 675 static __devinit int wm8731_i2c_probe(struct i2c_client *i2c,
 676                                       const struct i2c_device_id *id)
 677 {
 678         struct wm8731_priv *wm8731;
 679         struct snd_soc_codec *codec;
 680
 681         wm8731 = kzalloc(sizeof(struct wm8731_priv), GFP_KERNEL);
 682         if (wm8731 == NULL)
 683                 return -ENOMEM;
 684
 685         codec = &wm8731->codec;
 686
 687         i2c_set_clientdata(i2c, wm8731);
 688         codec->control_data = i2c;
 689
 690         codec->dev = &i2c->dev;
 691
 692         return wm8731_register(wm8731, SND_SOC_I2C);
 693 }
 694
 695 static __devexit int wm8731_i2c_remove(struct i2c_client *client)
 696 {
 697         struct wm8731_priv *wm8731 = i2c_get_clientdata(client);
 698         wm8731_unregister(wm8731);
 699         return 0;
 700 }
 701
 702 #ifdef CONFIG_PM
 703 static int wm8731_i2c_suspend(struct i2c_client *i2c, pm_message_t msg)
 704 {
 705         return snd_soc_suspend_device(&i2c->dev);
 706 }
 707
 708 static int wm8731_i2c_resume(struct i2c_client *i2c)
 709 {
 710         return snd_soc_resume_device(&i2c->dev);
 711 }
 712 #else
 713 #define wm8731_i2c_suspend NULL
 714 #define wm8731_i2c_resume NULL
 715 #endif
 716
 717 static const struct i2c_device_id wm8731_i2c_id[] = {
 718         { "wm8731", 0 },
 719         { }
 720 };
 721 MODULE_DEVICE_TABLE(i2c, wm8731_i2c_id);
 722
 723 static struct i2c_driver wm8731_i2c_driver = {
 724         .driver = {
 725                 .name = "WM8731 I2C Codec",
 726                 .owner = THIS_MODULE,
 727         },
 728         .probe =    wm8731_i2c_probe,
 729         .remove =   __devexit_p(wm8731_i2c_remove),
 730         .suspend =  wm8731_i2c_suspend,
 731         .resume =   wm8731_i2c_resume,
 732         .id_table = wm8731_i2c_id,
 733 };
 734 #endif
 735
 736 static int __init wm8731_modinit(void)
 737 {
 738         int ret;
 739 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 740         ret = i2c_add_driver(&wm8731_i2c_driver);
 741         if (ret != 0) {
 742                 printk(KERN_ERR "Failed to register WM8731 I2C driver: %d\n",
 743                        ret);
 744         }
 745 #endif
 746 #if defined(CONFIG_SPI_MASTER)
 747         ret = spi_register_driver(&wm8731_spi_driver);
 748         if (ret != 0) {
 749                 printk(KERN_ERR "Failed to register WM8731 SPI driver: %d\n",
 750                        ret);
 751         }
 752 #endif
 753         return 0;
 754 }
 755 module_init(wm8731_modinit);
 756
 757 static void __exit wm8731_exit(void)
 758 {
 759 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 760         i2c_del_driver(&wm8731_i2c_driver);
 761 #endif
 762 #if defined(CONFIG_SPI_MASTER)
 763         spi_unregister_driver(&wm8731_spi_driver);
 764 #endif
 765 }
 766 module_exit(wm8731_exit);
 767
 768 MODULE_DESCRIPTION("ASoC WM8731 driver");
 769 MODULE_AUTHOR("Richard Purdie");
 770 MODULE_LICENSE("GPL");