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 #include <sound/tlv.h>
  30
  31 #include "wm8731.h"
  32
  33 static struct snd_soc_codec *wm8731_codec;
  34 struct snd_soc_codec_device soc_codec_dev_wm8731;
  35
  36 /* codec private data */
  37 struct wm8731_priv {
  38         struct snd_soc_codec codec;
  39         u16 reg_cache[WM8731_CACHEREGNUM];
  40         unsigned int sysclk;
  41 };
  42
  43 #ifdef CONFIG_SPI_MASTER
  44 static int wm8731_spi_write(struct spi_device *spi, const char *data, int len);
  45 #endif
  46
  47 /*
  48  * wm8731 register cache
  49  * We can't read the WM8731 register space when we are
  50  * using 2 wire for device control, so we cache them instead.
  51  * There is no point in caching the reset register
  52  */
  53 static const u16 wm8731_reg[WM8731_CACHEREGNUM] = {
  54     0x0097, 0x0097, 0x0079, 0x0079,
  55     0x000a, 0x0008, 0x009f, 0x000a,
  56     0x0000, 0x0000
  57 };
  58
  59 /*
  60  * read wm8731 register cache
  61  */
  62 static inline unsigned int wm8731_read_reg_cache(struct snd_soc_codec *codec,
  63         unsigned int reg)
  64 {
  65         u16 *cache = codec->reg_cache;
  66         if (reg == WM8731_RESET)
  67                 return 0;
  68         if (reg >= WM8731_CACHEREGNUM)
  69                 return -1;
  70         return cache[reg];
  71 }
  72
  73 /*
  74  * write wm8731 register cache
  75  */
  76 static inline void wm8731_write_reg_cache(struct snd_soc_codec *codec,
  77         u16 reg, unsigned int value)
  78 {
  79         u16 *cache = codec->reg_cache;
  80         if (reg >= WM8731_CACHEREGNUM)
  81                 return;
  82         cache[reg] = value;
  83 }
  84
  85 /*
  86  * write to the WM8731 register space
  87  */
  88 static int wm8731_write(struct snd_soc_codec *codec, unsigned int reg,
  89         unsigned int value)
  90 {
  91         u8 data[2];
  92
  93         /* data is
  94          *   D15..D9 WM8731 register offset
  95          *   D8...D0 register data
  96          */
  97         data[0] = (reg << 1) | ((value >> 8) & 0x0001);
  98         data[1] = value & 0x00ff;
  99
 100         wm8731_write_reg_cache(codec, reg, value);
 101         if (codec->hw_write(codec->control_data, data, 2) == 2)
 102                 return 0;
 103         else
 104                 return -EIO;
 105 }
 106
 107 #define wm8731_reset(c) wm8731_write(c, WM8731_RESET, 0)
 108
 109 static const char *wm8731_input_select[] = {"Line In", "Mic"};
 110 static const char *wm8731_deemph[] = {"None", "32Khz", "44.1Khz", "48Khz"};
 111
 112 static const struct soc_enum wm8731_enum[] = {
 113         SOC_ENUM_SINGLE(WM8731_APANA, 2, 2, wm8731_input_select),
 114         SOC_ENUM_SINGLE(WM8731_APDIGI, 1, 4, wm8731_deemph),
 115 };
 116
 117 static const DECLARE_TLV_DB_SCALE(in_tlv, -3450, 150, 0);
 118 static const DECLARE_TLV_DB_SCALE(sidetone_tlv, -1500, 300, 0);
 119 static const DECLARE_TLV_DB_SCALE(out_tlv, -12100, 100, 1);
 120
 121 static const struct snd_kcontrol_new wm8731_snd_controls[] = {
 122
 123 SOC_DOUBLE_R_TLV("Master Playback Volume", WM8731_LOUT1V, WM8731_ROUT1V,
 124                  0, 127, 0, out_tlv),
 125 SOC_DOUBLE_R("Master Playback ZC Switch", WM8731_LOUT1V, WM8731_ROUT1V,
 126         7, 1, 0),
 127
 128 SOC_DOUBLE_R_TLV("Capture Volume", WM8731_LINVOL, WM8731_RINVOL, 0, 31, 0,
 129                  in_tlv),
 130 SOC_DOUBLE_R("Line Capture Switch", WM8731_LINVOL, WM8731_RINVOL, 7, 1, 1),
 131
 132 SOC_SINGLE("Mic Boost (+20dB)", WM8731_APANA, 0, 1, 0),
 133 SOC_SINGLE("Mic Capture Switch", WM8731_APANA, 1, 1, 1),
 134
 135 SOC_SINGLE_TLV("Sidetone Playback Volume", WM8731_APANA, 6, 3, 1,
 136                sidetone_tlv),
 137
 138 SOC_SINGLE("ADC High Pass Filter Switch", WM8731_APDIGI, 0, 1, 1),
 139 SOC_SINGLE("Store DC Offset Switch", WM8731_APDIGI, 4, 1, 0),
 140
 141 SOC_ENUM("Playback De-emphasis", wm8731_enum[1]),
 142 };
 143
 144 /* Output Mixer */
 145 static const struct snd_kcontrol_new wm8731_output_mixer_controls[] = {
 146 SOC_DAPM_SINGLE("Line Bypass Switch", WM8731_APANA, 3, 1, 0),
 147 SOC_DAPM_SINGLE("Mic Sidetone Switch", WM8731_APANA, 5, 1, 0),
 148 SOC_DAPM_SINGLE("HiFi Playback Switch", WM8731_APANA, 4, 1, 0),
 149 };
 150
 151 /* Input mux */
 152 static const struct snd_kcontrol_new wm8731_input_mux_controls =
 153 SOC_DAPM_ENUM("Input Select", wm8731_enum[0]);
 154
 155 static const struct snd_soc_dapm_widget wm8731_dapm_widgets[] = {
 156 SND_SOC_DAPM_MIXER("Output Mixer", WM8731_PWR, 4, 1,
 157         &wm8731_output_mixer_controls[0],
 158         ARRAY_SIZE(wm8731_output_mixer_controls)),
 159 SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8731_PWR, 3, 1),
 160 SND_SOC_DAPM_OUTPUT("LOUT"),
 161 SND_SOC_DAPM_OUTPUT("LHPOUT"),
 162 SND_SOC_DAPM_OUTPUT("ROUT"),
 163 SND_SOC_DAPM_OUTPUT("RHPOUT"),
 164 SND_SOC_DAPM_ADC("ADC", "HiFi Capture", WM8731_PWR, 2, 1),
 165 SND_SOC_DAPM_MUX("Input Mux", SND_SOC_NOPM, 0, 0, &wm8731_input_mux_controls),
 166 SND_SOC_DAPM_PGA("Line Input", WM8731_PWR, 0, 1, NULL, 0),
 167 SND_SOC_DAPM_MICBIAS("Mic Bias", WM8731_PWR, 1, 1),
 168 SND_SOC_DAPM_INPUT("MICIN"),
 169 SND_SOC_DAPM_INPUT("RLINEIN"),
 170 SND_SOC_DAPM_INPUT("LLINEIN"),
 171 };
 172
 173 static const struct snd_soc_dapm_route intercon[] = {
 174         /* output mixer */
 175         {"Output Mixer", "Line Bypass Switch", "Line Input"},
 176         {"Output Mixer", "HiFi Playback Switch", "DAC"},
 177         {"Output Mixer", "Mic Sidetone Switch", "Mic Bias"},
 178
 179         /* outputs */
 180         {"RHPOUT", NULL, "Output Mixer"},
 181         {"ROUT", NULL, "Output Mixer"},
 182         {"LHPOUT", NULL, "Output Mixer"},
 183         {"LOUT", NULL, "Output Mixer"},
 184
 185         /* input mux */
 186         {"Input Mux", "Line In", "Line Input"},
 187         {"Input Mux", "Mic", "Mic Bias"},
 188         {"ADC", NULL, "Input Mux"},
 189
 190         /* inputs */
 191         {"Line Input", NULL, "LLINEIN"},
 192         {"Line Input", NULL, "RLINEIN"},
 193         {"Mic Bias", NULL, "MICIN"},
 194 };
 195
 196 static int wm8731_add_widgets(struct snd_soc_codec *codec)
 197 {
 198         snd_soc_dapm_new_controls(codec, wm8731_dapm_widgets,
 199                                   ARRAY_SIZE(wm8731_dapm_widgets));
 200
 201         snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));
 202
 203         snd_soc_dapm_new_widgets(codec);
 204         return 0;
 205 }
 206
 207 struct _coeff_div {
 208         u32 mclk;
 209         u32 rate;
 210         u16 fs;
 211         u8 sr:4;
 212         u8 bosr:1;
 213         u8 usb:1;
 214 };
 215
 216 /* codec mclk clock divider coefficients */
 217 static const struct _coeff_div coeff_div[] = {
 218         /* 48k */
 219         {12288000, 48000, 256, 0x0, 0x0, 0x0},
 220         {18432000, 48000, 384, 0x0, 0x1, 0x0},
 221         {12000000, 48000, 250, 0x0, 0x0, 0x1},
 222
 223         /* 32k */
 224         {12288000, 32000, 384, 0x6, 0x0, 0x0},
 225         {18432000, 32000, 576, 0x6, 0x1, 0x0},
 226         {12000000, 32000, 375, 0x6, 0x0, 0x1},
 227
 228         /* 8k */
 229         {12288000, 8000, 1536, 0x3, 0x0, 0x0},
 230         {18432000, 8000, 2304, 0x3, 0x1, 0x0},
 231         {11289600, 8000, 1408, 0xb, 0x0, 0x0},
 232         {16934400, 8000, 2112, 0xb, 0x1, 0x0},
 233         {12000000, 8000, 1500, 0x3, 0x0, 0x1},
 234
 235         /* 96k */
 236         {12288000, 96000, 128, 0x7, 0x0, 0x0},
 237         {18432000, 96000, 192, 0x7, 0x1, 0x0},
 238         {12000000, 96000, 125, 0x7, 0x0, 0x1},
 239
 240         /* 44.1k */
 241         {11289600, 44100, 256, 0x8, 0x0, 0x0},
 242         {16934400, 44100, 384, 0x8, 0x1, 0x0},
 243         {12000000, 44100, 272, 0x8, 0x1, 0x1},
 244
 245         /* 88.2k */
 246         {11289600, 88200, 128, 0xf, 0x0, 0x0},
 247         {16934400, 88200, 192, 0xf, 0x1, 0x0},
 248         {12000000, 88200, 136, 0xf, 0x1, 0x1},
 249 };
 250
 251 static inline int get_coeff(int mclk, int rate)
 252 {
 253         int i;
 254
 255         for (i = 0; i < ARRAY_SIZE(coeff_div); i++) {
 256                 if (coeff_div[i].rate == rate && coeff_div[i].mclk == mclk)
 257                         return i;
 258         }
 259         return 0;
 260 }
 261
 262 static int wm8731_hw_params(struct snd_pcm_substream *substream,
 263                             struct snd_pcm_hw_params *params,
 264                             struct snd_soc_dai *dai)
 265 {
 266         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 267         struct snd_soc_device *socdev = rtd->socdev;
 268         struct snd_soc_codec *codec = socdev->card->codec;
 269         struct wm8731_priv *wm8731 = codec->private_data;
 270         u16 iface = wm8731_read_reg_cache(codec, WM8731_IFACE) & 0xfff3;
 271         int i = get_coeff(wm8731->sysclk, params_rate(params));
 272         u16 srate = (coeff_div[i].sr << 2) |
 273                 (coeff_div[i].bosr << 1) | coeff_div[i].usb;
 274
 275         wm8731_write(codec, WM8731_SRATE, srate);
 276
 277         /* bit size */
 278         switch (params_format(params)) {
 279         case SNDRV_PCM_FORMAT_S16_LE:
 280                 break;
 281         case SNDRV_PCM_FORMAT_S20_3LE:
 282                 iface |= 0x0004;
 283                 break;
 284         case SNDRV_PCM_FORMAT_S24_LE:
 285                 iface |= 0x0008;
 286                 break;
 287         }
 288
 289         wm8731_write(codec, WM8731_IFACE, iface);
 290         return 0;
 291 }
 292
 293 static int wm8731_pcm_prepare(struct snd_pcm_substream *substream,
 294                               struct snd_soc_dai *dai)
 295 {
 296         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 297         struct snd_soc_device *socdev = rtd->socdev;
 298         struct snd_soc_codec *codec = socdev->card->codec;
 299
 300         /* set active */
 301         wm8731_write(codec, WM8731_ACTIVE, 0x0001);
 302
 303         return 0;
 304 }
 305
 306 static void wm8731_shutdown(struct snd_pcm_substream *substream,
 307                             struct snd_soc_dai *dai)
 308 {
 309         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 310         struct snd_soc_device *socdev = rtd->socdev;
 311         struct snd_soc_codec *codec = socdev->card->codec;
 312
 313         /* deactivate */
 314         if (!codec->active) {
 315                 udelay(50);
 316                 wm8731_write(codec, WM8731_ACTIVE, 0x0);
 317         }
 318 }
 319
 320 static int wm8731_mute(struct snd_soc_dai *dai, int mute)
 321 {
 322         struct snd_soc_codec *codec = dai->codec;
 323         u16 mute_reg = wm8731_read_reg_cache(codec, WM8731_APDIGI) & 0xfff7;
 324
 325         if (mute)
 326                 wm8731_write(codec, WM8731_APDIGI, mute_reg | 0x8);
 327         else
 328                 wm8731_write(codec, WM8731_APDIGI, mute_reg);
 329         return 0;
 330 }
 331
 332 static int wm8731_set_dai_sysclk(struct snd_soc_dai *codec_dai,
 333                 int clk_id, unsigned int freq, int dir)
 334 {
 335         struct snd_soc_codec *codec = codec_dai->codec;
 336         struct wm8731_priv *wm8731 = codec->private_data;
 337
 338         switch (freq) {
 339         case 11289600:
 340         case 12000000:
 341         case 12288000:
 342         case 16934400:
 343         case 18432000:
 344                 wm8731->sysclk = freq;
 345                 return 0;
 346         }
 347         return -EINVAL;
 348 }
 349
 350
 351 static int wm8731_set_dai_fmt(struct snd_soc_dai *codec_dai,
 352                 unsigned int fmt)
 353 {
 354         struct snd_soc_codec *codec = codec_dai->codec;
 355         u16 iface = 0;
 356
 357         /* set master/slave audio interface */
 358         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 359         case SND_SOC_DAIFMT_CBM_CFM:
 360                 iface |= 0x0040;
 361                 break;
 362         case SND_SOC_DAIFMT_CBS_CFS:
 363                 break;
 364         default:
 365                 return -EINVAL;
 366         }
 367
 368         /* interface format */
 369         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 370         case SND_SOC_DAIFMT_I2S:
 371                 iface |= 0x0002;
 372                 break;
 373         case SND_SOC_DAIFMT_RIGHT_J:
 374                 break;
 375         case SND_SOC_DAIFMT_LEFT_J:
 376                 iface |= 0x0001;
 377                 break;
 378         case SND_SOC_DAIFMT_DSP_A:
 379                 iface |= 0x0003;
 380                 break;
 381         case SND_SOC_DAIFMT_DSP_B:
 382                 iface |= 0x0013;
 383                 break;
 384         default:
 385                 return -EINVAL;
 386         }
 387
 388         /* clock inversion */
 389         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 390         case SND_SOC_DAIFMT_NB_NF:
 391                 break;
 392         case SND_SOC_DAIFMT_IB_IF:
 393                 iface |= 0x0090;
 394                 break;
 395         case SND_SOC_DAIFMT_IB_NF:
 396                 iface |= 0x0080;
 397                 break;
 398         case SND_SOC_DAIFMT_NB_IF:
 399                 iface |= 0x0010;
 400                 break;
 401         default:
 402                 return -EINVAL;
 403         }
 404
 405         /* set iface */
 406         wm8731_write(codec, WM8731_IFACE, iface);
 407         return 0;
 408 }
 409
 410 static int wm8731_set_bias_level(struct snd_soc_codec *codec,
 411                                  enum snd_soc_bias_level level)
 412 {
 413         u16 reg;
 414
 415         switch (level) {
 416         case SND_SOC_BIAS_ON:
 417                 break;
 418         case SND_SOC_BIAS_PREPARE:
 419                 break;
 420         case SND_SOC_BIAS_STANDBY:
 421                 /* Clear PWROFF, gate CLKOUT, everything else as-is */
 422                 reg = wm8731_read_reg_cache(codec, WM8731_PWR) & 0xff7f;
 423                 wm8731_write(codec, WM8731_PWR, reg | 0x0040);
 424                 break;
 425         case SND_SOC_BIAS_OFF:
 426                 wm8731_write(codec, WM8731_ACTIVE, 0x0);
 427                 wm8731_write(codec, WM8731_PWR, 0xffff);
 428                 break;
 429         }
 430         codec->bias_level = level;
 431         return 0;
 432 }
 433
 434 #define WM8731_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
 435                 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 |\
 436                 SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\
 437                 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |\
 438                 SNDRV_PCM_RATE_96000)
 439
 440 #define WM8731_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
 441         SNDRV_PCM_FMTBIT_S24_LE)
 442
 443 static struct snd_soc_dai_ops wm8731_dai_ops = {
 444         .prepare        = wm8731_pcm_prepare,
 445         .hw_params      = wm8731_hw_params,
 446         .shutdown       = wm8731_shutdown,
 447         .digital_mute   = wm8731_mute,
 448         .set_sysclk     = wm8731_set_dai_sysclk,
 449         .set_fmt        = wm8731_set_dai_fmt,
 450 };
 451
 452 struct snd_soc_dai wm8731_dai = {
 453         .name = "WM8731",
 454         .playback = {
 455                 .stream_name = "Playback",
 456                 .channels_min = 1,
 457                 .channels_max = 2,
 458                 .rates = WM8731_RATES,
 459                 .formats = WM8731_FORMATS,},
 460         .capture = {
 461                 .stream_name = "Capture",
 462                 .channels_min = 1,
 463                 .channels_max = 2,
 464                 .rates = WM8731_RATES,
 465                 .formats = WM8731_FORMATS,},
 466         .ops = &wm8731_dai_ops,
 467         .symmetric_rates = 1,
 468 };
 469 EXPORT_SYMBOL_GPL(wm8731_dai);
 470
 471 #ifdef CONFIG_PM
 472 static int wm8731_suspend(struct platform_device *pdev, pm_message_t state)
 473 {
 474         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 475         struct snd_soc_codec *codec = socdev->card->codec;
 476
 477         wm8731_write(codec, WM8731_ACTIVE, 0x0);
 478         wm8731_set_bias_level(codec, SND_SOC_BIAS_OFF);
 479         return 0;
 480 }
 481
 482 static int wm8731_resume(struct platform_device *pdev)
 483 {
 484         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 485         struct snd_soc_codec *codec = socdev->card->codec;
 486         int i;
 487         u8 data[2];
 488         u16 *cache = codec->reg_cache;
 489
 490         /* Sync reg_cache with the hardware */
 491         for (i = 0; i < ARRAY_SIZE(wm8731_reg); i++) {
 492                 data[0] = (i << 1) | ((cache[i] >> 8) & 0x0001);
 493                 data[1] = cache[i] & 0x00ff;
 494                 codec->hw_write(codec->control_data, data, 2);
 495         }
 496         wm8731_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 497         wm8731_set_bias_level(codec, codec->suspend_bias_level);
 498         return 0;
 499 }
 500 #else
 501 #define wm8731_suspend NULL
 502 #define wm8731_resume NULL
 503 #endif
 504
 505 static int wm8731_probe(struct platform_device *pdev)
 506 {
 507         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 508         struct snd_soc_codec *codec;
 509         int ret = 0;
 510
 511         if (wm8731_codec == NULL) {
 512                 dev_err(&pdev->dev, "Codec device not registered\n");
 513                 return -ENODEV;
 514         }
 515
 516         socdev->card->codec = wm8731_codec;
 517         codec = wm8731_codec;
 518
 519         /* register pcms */
 520         ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
 521         if (ret < 0) {
 522                 dev_err(codec->dev, "failed to create pcms: %d\n", ret);
 523                 goto pcm_err;
 524         }
 525
 526         snd_soc_add_controls(codec, wm8731_snd_controls,
 527                              ARRAY_SIZE(wm8731_snd_controls));
 528         wm8731_add_widgets(codec);
 529         ret = snd_soc_init_card(socdev);
 530         if (ret < 0) {
 531                 dev_err(codec->dev, "failed to register card: %d\n", ret);
 532                 goto card_err;
 533         }
 534
 535         return ret;
 536
 537 card_err:
 538         snd_soc_free_pcms(socdev);
 539         snd_soc_dapm_free(socdev);
 540 pcm_err:
 541         return ret;
 542 }
 543
 544 /* power down chip */
 545 static int wm8731_remove(struct platform_device *pdev)
 546 {
 547         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 548
 549         snd_soc_free_pcms(socdev);
 550         snd_soc_dapm_free(socdev);
 551
 552         return 0;
 553 }
 554
 555 struct snd_soc_codec_device soc_codec_dev_wm8731 = {
 556         .probe =        wm8731_probe,
 557         .remove =       wm8731_remove,
 558         .suspend =      wm8731_suspend,
 559         .resume =       wm8731_resume,
 560 };
 561 EXPORT_SYMBOL_GPL(soc_codec_dev_wm8731);
 562
 563 static int wm8731_register(struct wm8731_priv *wm8731)
 564 {
 565         int ret;
 566         struct snd_soc_codec *codec = &wm8731->codec;
 567         u16 reg;
 568
 569         if (wm8731_codec) {
 570                 dev_err(codec->dev, "Another WM8731 is registered\n");
 571                 ret = -EINVAL;
 572                 goto err;
 573         }
 574
 575         mutex_init(&codec->mutex);
 576         INIT_LIST_HEAD(&codec->dapm_widgets);
 577         INIT_LIST_HEAD(&codec->dapm_paths);
 578
 579         codec->private_data = wm8731;
 580         codec->name = "WM8731";
 581         codec->owner = THIS_MODULE;
 582         codec->read = wm8731_read_reg_cache;
 583         codec->write = wm8731_write;
 584         codec->bias_level = SND_SOC_BIAS_OFF;
 585         codec->set_bias_level = wm8731_set_bias_level;
 586         codec->dai = &wm8731_dai;
 587         codec->num_dai = 1;
 588         codec->reg_cache_size = WM8731_CACHEREGNUM;
 589         codec->reg_cache = &wm8731->reg_cache;
 590
 591         memcpy(codec->reg_cache, wm8731_reg, sizeof(wm8731_reg));
 592
 593         ret = wm8731_reset(codec);
 594         if (ret < 0) {
 595                 dev_err(codec->dev, "Failed to issue reset: %d\n", ret);
 596                 goto err;
 597         }
 598
 599         wm8731_dai.dev = codec->dev;
 600
 601         wm8731_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 602
 603         /* Latch the update bits */
 604         reg = wm8731_read_reg_cache(codec, WM8731_LOUT1V);
 605         wm8731_write(codec, WM8731_LOUT1V, reg & ~0x0100);
 606         reg = wm8731_read_reg_cache(codec, WM8731_ROUT1V);
 607         wm8731_write(codec, WM8731_ROUT1V, reg & ~0x0100);
 608         reg = wm8731_read_reg_cache(codec, WM8731_LINVOL);
 609         wm8731_write(codec, WM8731_LINVOL, reg & ~0x0100);
 610         reg = wm8731_read_reg_cache(codec, WM8731_RINVOL);
 611         wm8731_write(codec, WM8731_RINVOL, reg & ~0x0100);
 612
 613         /* Disable bypass path by default */
 614         reg = wm8731_read_reg_cache(codec, WM8731_APANA);
 615         wm8731_write(codec, WM8731_APANA, reg & ~0x4);
 616
 617         wm8731_codec = codec;
 618
 619         ret = snd_soc_register_codec(codec);
 620         if (ret != 0) {
 621                 dev_err(codec->dev, "Failed to register codec: %d\n", ret);
 622                 goto err;
 623         }
 624
 625         ret = snd_soc_register_dai(&wm8731_dai);
 626         if (ret != 0) {
 627                 dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
 628                 snd_soc_unregister_codec(codec);
 629                 goto err_codec;
 630         }
 631
 632         return 0;
 633
 634 err_codec:
 635         snd_soc_unregister_codec(codec);
 636 err:
 637         kfree(wm8731);
 638         return ret;
 639 }
 640
 641 static void wm8731_unregister(struct wm8731_priv *wm8731)
 642 {
 643         wm8731_set_bias_level(&wm8731->codec, SND_SOC_BIAS_OFF);
 644         snd_soc_unregister_dai(&wm8731_dai);
 645         snd_soc_unregister_codec(&wm8731->codec);
 646         kfree(wm8731);
 647         wm8731_codec = NULL;
 648 }
 649
 650 #if defined(CONFIG_SPI_MASTER)
 651 static int wm8731_spi_write(struct spi_device *spi, const char *data, int len)
 652 {
 653         struct spi_transfer t;
 654         struct spi_message m;
 655         u8 msg[2];
 656
 657         if (len <= 0)
 658                 return 0;
 659
 660         msg[0] = data[0];
 661         msg[1] = data[1];
 662
 663         spi_message_init(&m);
 664         memset(&t, 0, (sizeof t));
 665
 666         t.tx_buf = &msg[0];
 667         t.len = len;
 668
 669         spi_message_add_tail(&t, &m);
 670         spi_sync(spi, &m);
 671
 672         return len;
 673 }
 674
 675 static int __devinit wm8731_spi_probe(struct spi_device *spi)
 676 {
 677         struct snd_soc_codec *codec;
 678         struct wm8731_priv *wm8731;
 679
 680         wm8731 = kzalloc(sizeof(struct wm8731_priv), GFP_KERNEL);
 681         if (wm8731 == NULL)
 682                 return -ENOMEM;
 683
 684         codec = &wm8731->codec;
 685         codec->control_data = spi;
 686         codec->hw_write = (hw_write_t)wm8731_spi_write;
 687         codec->dev = &spi->dev;
 688
 689         dev_set_drvdata(&spi->dev, wm8731);
 690
 691         return wm8731_register(wm8731);
 692 }
 693
 694 static int __devexit wm8731_spi_remove(struct spi_device *spi)
 695 {
 696         struct wm8731_priv *wm8731 = dev_get_drvdata(&spi->dev);
 697
 698         wm8731_unregister(wm8731);
 699
 700         return 0;
 701 }
 702
 703 #ifdef CONFIG_PM
 704 static int wm8731_spi_suspend(struct spi_device *spi, pm_message_t msg)
 705 {
 706         return snd_soc_suspend_device(&spi->dev);
 707 }
 708
 709 static int wm8731_spi_resume(struct spi_device *spi)
 710 {
 711         return snd_soc_resume_device(&spi->dev);
 712 }
 713 #else
 714 #define wm8731_spi_suspend NULL
 715 #define wm8731_spi_resume NULL
 716 #endif
 717
 718 static struct spi_driver wm8731_spi_driver = {
 719         .driver = {
 720                 .name   = "wm8731",
 721                 .bus    = &spi_bus_type,
 722                 .owner  = THIS_MODULE,
 723         },
 724         .probe          = wm8731_spi_probe,
 725         .suspend        = wm8731_spi_suspend,
 726         .resume         = wm8731_spi_resume,
 727         .remove         = __devexit_p(wm8731_spi_remove),
 728 };
 729 #endif /* CONFIG_SPI_MASTER */
 730
 731 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 732 static __devinit int wm8731_i2c_probe(struct i2c_client *i2c,
 733                                       const struct i2c_device_id *id)
 734 {
 735         struct wm8731_priv *wm8731;
 736         struct snd_soc_codec *codec;
 737
 738         wm8731 = kzalloc(sizeof(struct wm8731_priv), GFP_KERNEL);
 739         if (wm8731 == NULL)
 740                 return -ENOMEM;
 741
 742         codec = &wm8731->codec;
 743         codec->hw_write = (hw_write_t)i2c_master_send;
 744
 745         i2c_set_clientdata(i2c, wm8731);
 746         codec->control_data = i2c;
 747
 748         codec->dev = &i2c->dev;
 749
 750         return wm8731_register(wm8731);
 751 }
 752
 753 static __devexit int wm8731_i2c_remove(struct i2c_client *client)
 754 {
 755         struct wm8731_priv *wm8731 = i2c_get_clientdata(client);
 756         wm8731_unregister(wm8731);
 757         return 0;
 758 }
 759
 760 #ifdef CONFIG_PM
 761 static int wm8731_i2c_suspend(struct i2c_client *i2c, pm_message_t msg)
 762 {
 763         return snd_soc_suspend_device(&i2c->dev);
 764 }
 765
 766 static int wm8731_i2c_resume(struct i2c_client *i2c)
 767 {
 768         return snd_soc_resume_device(&i2c->dev);
 769 }
 770 #else
 771 #define wm8731_i2c_suspend NULL
 772 #define wm8731_i2c_resume NULL
 773 #endif
 774
 775 static const struct i2c_device_id wm8731_i2c_id[] = {
 776         { "wm8731", 0 },
 777         { }
 778 };
 779 MODULE_DEVICE_TABLE(i2c, wm8731_i2c_id);
 780
 781 static struct i2c_driver wm8731_i2c_driver = {
 782         .driver = {
 783                 .name = "WM8731 I2C Codec",
 784                 .owner = THIS_MODULE,
 785         },
 786         .probe =    wm8731_i2c_probe,
 787         .remove =   __devexit_p(wm8731_i2c_remove),
 788         .suspend =  wm8731_i2c_suspend,
 789         .resume =   wm8731_i2c_resume,
 790         .id_table = wm8731_i2c_id,
 791 };
 792 #endif
 793
 794 static int __init wm8731_modinit(void)
 795 {
 796         int ret;
 797 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 798         ret = i2c_add_driver(&wm8731_i2c_driver);
 799         if (ret != 0) {
 800                 printk(KERN_ERR "Failed to register WM8731 I2C driver: %d\n",
 801                        ret);
 802         }
 803 #endif
 804 #if defined(CONFIG_SPI_MASTER)
 805         ret = spi_register_driver(&wm8731_spi_driver);
 806         if (ret != 0) {
 807                 printk(KERN_ERR "Failed to register WM8731 SPI driver: %d\n",
 808                        ret);
 809         }
 810 #endif
 811         return 0;
 812 }
 813 module_init(wm8731_modinit);
 814
 815 static void __exit wm8731_exit(void)
 816 {
 817 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 818         i2c_del_driver(&wm8731_i2c_driver);
 819 #endif
 820 #if defined(CONFIG_SPI_MASTER)
 821         spi_unregister_driver(&wm8731_spi_driver);
 822 #endif
 823 }
 824 module_exit(wm8731_exit);
 825
 826 MODULE_DESCRIPTION("ASoC WM8731 driver");
 827 MODULE_AUTHOR("Richard Purdie");
 828 MODULE_LICENSE("GPL");