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 #define WM8731_VERSION "0.13"
  33
  34 struct snd_soc_codec_device soc_codec_dev_wm8731;
  35
  36 /* codec private data */
  37 struct wm8731_priv {
  38         unsigned int sysclk;
  39 };
  40
  41 /*
  42  * wm8731 register cache
  43  * We can't read the WM8731 register space when we are
  44  * using 2 wire for device control, so we cache them instead.
  45  * There is no point in caching the reset register
  46  */
  47 static const u16 wm8731_reg[WM8731_CACHEREGNUM] = {
  48     0x0097, 0x0097, 0x0079, 0x0079,
  49     0x000a, 0x0008, 0x009f, 0x000a,
  50     0x0000, 0x0000
  51 };
  52
  53 /*
  54  * read wm8731 register cache
  55  */
  56 static inline unsigned int wm8731_read_reg_cache(struct snd_soc_codec *codec,
  57         unsigned int reg)
  58 {
  59         u16 *cache = codec->reg_cache;
  60         if (reg == WM8731_RESET)
  61                 return 0;
  62         if (reg >= WM8731_CACHEREGNUM)
  63                 return -1;
  64         return cache[reg];
  65 }
  66
  67 /*
  68  * write wm8731 register cache
  69  */
  70 static inline void wm8731_write_reg_cache(struct snd_soc_codec *codec,
  71         u16 reg, unsigned int value)
  72 {
  73         u16 *cache = codec->reg_cache;
  74         if (reg >= WM8731_CACHEREGNUM)
  75                 return;
  76         cache[reg] = value;
  77 }
  78
  79 /*
  80  * write to the WM8731 register space
  81  */
  82 static int wm8731_write(struct snd_soc_codec *codec, unsigned int reg,
  83         unsigned int value)
  84 {
  85         u8 data[2];
  86
  87         /* data is
  88          *   D15..D9 WM8731 register offset
  89          *   D8...D0 register data
  90          */
  91         data[0] = (reg << 1) | ((value >> 8) & 0x0001);
  92         data[1] = value & 0x00ff;
  93
  94         wm8731_write_reg_cache(codec, reg, value);
  95         if (codec->hw_write(codec->control_data, data, 2) == 2)
  96                 return 0;
  97         else
  98                 return -EIO;
  99 }
 100
 101 #define wm8731_reset(c) wm8731_write(c, WM8731_RESET, 0)
 102
 103 static const char *wm8731_input_select[] = {"Line In", "Mic"};
 104 static const char *wm8731_deemph[] = {"None", "32Khz", "44.1Khz", "48Khz"};
 105
 106 static const struct soc_enum wm8731_enum[] = {
 107         SOC_ENUM_SINGLE(WM8731_APANA, 2, 2, wm8731_input_select),
 108         SOC_ENUM_SINGLE(WM8731_APDIGI, 1, 4, wm8731_deemph),
 109 };
 110
 111 static const struct snd_kcontrol_new wm8731_snd_controls[] = {
 112
 113 SOC_DOUBLE_R("Master Playback Volume", WM8731_LOUT1V, WM8731_ROUT1V,
 114         0, 127, 0),
 115 SOC_DOUBLE_R("Master Playback ZC Switch", WM8731_LOUT1V, WM8731_ROUT1V,
 116         7, 1, 0),
 117
 118 SOC_DOUBLE_R("Capture Volume", WM8731_LINVOL, WM8731_RINVOL, 0, 31, 0),
 119 SOC_DOUBLE_R("Line Capture Switch", WM8731_LINVOL, WM8731_RINVOL, 7, 1, 1),
 120
 121 SOC_SINGLE("Mic Boost (+20dB)", WM8731_APANA, 0, 1, 0),
 122 SOC_SINGLE("Capture Mic Switch", WM8731_APANA, 1, 1, 1),
 123
 124 SOC_SINGLE("Sidetone Playback Volume", WM8731_APANA, 6, 3, 1),
 125
 126 SOC_SINGLE("ADC High Pass Filter Switch", WM8731_APDIGI, 0, 1, 1),
 127 SOC_SINGLE("Store DC Offset Switch", WM8731_APDIGI, 4, 1, 0),
 128
 129 SOC_ENUM("Playback De-emphasis", wm8731_enum[1]),
 130 };
 131
 132 /* Output Mixer */
 133 static const struct snd_kcontrol_new wm8731_output_mixer_controls[] = {
 134 SOC_DAPM_SINGLE("Line Bypass Switch", WM8731_APANA, 3, 1, 0),
 135 SOC_DAPM_SINGLE("Mic Sidetone Switch", WM8731_APANA, 5, 1, 0),
 136 SOC_DAPM_SINGLE("HiFi Playback Switch", WM8731_APANA, 4, 1, 0),
 137 };
 138
 139 /* Input mux */
 140 static const struct snd_kcontrol_new wm8731_input_mux_controls =
 141 SOC_DAPM_ENUM("Input Select", wm8731_enum[0]);
 142
 143 static const struct snd_soc_dapm_widget wm8731_dapm_widgets[] = {
 144 SND_SOC_DAPM_MIXER("Output Mixer", WM8731_PWR, 4, 1,
 145         &wm8731_output_mixer_controls[0],
 146         ARRAY_SIZE(wm8731_output_mixer_controls)),
 147 SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8731_PWR, 3, 1),
 148 SND_SOC_DAPM_OUTPUT("LOUT"),
 149 SND_SOC_DAPM_OUTPUT("LHPOUT"),
 150 SND_SOC_DAPM_OUTPUT("ROUT"),
 151 SND_SOC_DAPM_OUTPUT("RHPOUT"),
 152 SND_SOC_DAPM_ADC("ADC", "HiFi Capture", WM8731_PWR, 2, 1),
 153 SND_SOC_DAPM_MUX("Input Mux", SND_SOC_NOPM, 0, 0, &wm8731_input_mux_controls),
 154 SND_SOC_DAPM_PGA("Line Input", WM8731_PWR, 0, 1, NULL, 0),
 155 SND_SOC_DAPM_MICBIAS("Mic Bias", WM8731_PWR, 1, 1),
 156 SND_SOC_DAPM_INPUT("MICIN"),
 157 SND_SOC_DAPM_INPUT("RLINEIN"),
 158 SND_SOC_DAPM_INPUT("LLINEIN"),
 159 };
 160
 161 static const struct snd_soc_dapm_route intercon[] = {
 162         /* output mixer */
 163         {"Output Mixer", "Line Bypass Switch", "Line Input"},
 164         {"Output Mixer", "HiFi Playback Switch", "DAC"},
 165         {"Output Mixer", "Mic Sidetone Switch", "Mic Bias"},
 166
 167         /* outputs */
 168         {"RHPOUT", NULL, "Output Mixer"},
 169         {"ROUT", NULL, "Output Mixer"},
 170         {"LHPOUT", NULL, "Output Mixer"},
 171         {"LOUT", NULL, "Output Mixer"},
 172
 173         /* input mux */
 174         {"Input Mux", "Line In", "Line Input"},
 175         {"Input Mux", "Mic", "Mic Bias"},
 176         {"ADC", NULL, "Input Mux"},
 177
 178         /* inputs */
 179         {"Line Input", NULL, "LLINEIN"},
 180         {"Line Input", NULL, "RLINEIN"},
 181         {"Mic Bias", NULL, "MICIN"},
 182 };
 183
 184 static int wm8731_add_widgets(struct snd_soc_codec *codec)
 185 {
 186         snd_soc_dapm_new_controls(codec, wm8731_dapm_widgets,
 187                                   ARRAY_SIZE(wm8731_dapm_widgets));
 188
 189         snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));
 190
 191         snd_soc_dapm_new_widgets(codec);
 192         return 0;
 193 }
 194
 195 struct _coeff_div {
 196         u32 mclk;
 197         u32 rate;
 198         u16 fs;
 199         u8 sr:4;
 200         u8 bosr:1;
 201         u8 usb:1;
 202 };
 203
 204 /* codec mclk clock divider coefficients */
 205 static const struct _coeff_div coeff_div[] = {
 206         /* 48k */
 207         {12288000, 48000, 256, 0x0, 0x0, 0x0},
 208         {18432000, 48000, 384, 0x0, 0x1, 0x0},
 209         {12000000, 48000, 250, 0x0, 0x0, 0x1},
 210
 211         /* 32k */
 212         {12288000, 32000, 384, 0x6, 0x0, 0x0},
 213         {18432000, 32000, 576, 0x6, 0x1, 0x0},
 214         {12000000, 32000, 375, 0x6, 0x0, 0x1},
 215
 216         /* 8k */
 217         {12288000, 8000, 1536, 0x3, 0x0, 0x0},
 218         {18432000, 8000, 2304, 0x3, 0x1, 0x0},
 219         {11289600, 8000, 1408, 0xb, 0x0, 0x0},
 220         {16934400, 8000, 2112, 0xb, 0x1, 0x0},
 221         {12000000, 8000, 1500, 0x3, 0x0, 0x1},
 222
 223         /* 96k */
 224         {12288000, 96000, 128, 0x7, 0x0, 0x0},
 225         {18432000, 96000, 192, 0x7, 0x1, 0x0},
 226         {12000000, 96000, 125, 0x7, 0x0, 0x1},
 227
 228         /* 44.1k */
 229         {11289600, 44100, 256, 0x8, 0x0, 0x0},
 230         {16934400, 44100, 384, 0x8, 0x1, 0x0},
 231         {12000000, 44100, 272, 0x8, 0x1, 0x1},
 232
 233         /* 88.2k */
 234         {11289600, 88200, 128, 0xf, 0x0, 0x0},
 235         {16934400, 88200, 192, 0xf, 0x1, 0x0},
 236         {12000000, 88200, 136, 0xf, 0x1, 0x1},
 237 };
 238
 239 static inline int get_coeff(int mclk, int rate)
 240 {
 241         int i;
 242
 243         for (i = 0; i < ARRAY_SIZE(coeff_div); i++) {
 244                 if (coeff_div[i].rate == rate && coeff_div[i].mclk == mclk)
 245                         return i;
 246         }
 247         return 0;
 248 }
 249
 250 static int wm8731_hw_params(struct snd_pcm_substream *substream,
 251                             struct snd_pcm_hw_params *params,
 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->codec;
 257         struct wm8731_priv *wm8731 = codec->private_data;
 258         u16 iface = wm8731_read_reg_cache(codec, WM8731_IFACE) & 0xfff3;
 259         int i = get_coeff(wm8731->sysclk, params_rate(params));
 260         u16 srate = (coeff_div[i].sr << 2) |
 261                 (coeff_div[i].bosr << 1) | coeff_div[i].usb;
 262
 263         wm8731_write(codec, WM8731_SRATE, srate);
 264
 265         /* bit size */
 266         switch (params_format(params)) {
 267         case SNDRV_PCM_FORMAT_S16_LE:
 268                 break;
 269         case SNDRV_PCM_FORMAT_S20_3LE:
 270                 iface |= 0x0004;
 271                 break;
 272         case SNDRV_PCM_FORMAT_S24_LE:
 273                 iface |= 0x0008;
 274                 break;
 275         }
 276
 277         wm8731_write(codec, WM8731_IFACE, iface);
 278         return 0;
 279 }
 280
 281 static int wm8731_pcm_prepare(struct snd_pcm_substream *substream,
 282                               struct snd_soc_dai *dai)
 283 {
 284         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 285         struct snd_soc_device *socdev = rtd->socdev;
 286         struct snd_soc_codec *codec = socdev->codec;
 287
 288         /* set active */
 289         wm8731_write(codec, WM8731_ACTIVE, 0x0001);
 290
 291         return 0;
 292 }
 293
 294 static void wm8731_shutdown(struct snd_pcm_substream *substream,
 295                             struct snd_soc_dai *dai)
 296 {
 297         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 298         struct snd_soc_device *socdev = rtd->socdev;
 299         struct snd_soc_codec *codec = socdev->codec;
 300
 301         /* deactivate */
 302         if (!codec->active) {
 303                 udelay(50);
 304                 wm8731_write(codec, WM8731_ACTIVE, 0x0);
 305         }
 306 }
 307
 308 static int wm8731_mute(struct snd_soc_dai *dai, int mute)
 309 {
 310         struct snd_soc_codec *codec = dai->codec;
 311         u16 mute_reg = wm8731_read_reg_cache(codec, WM8731_APDIGI) & 0xfff7;
 312
 313         if (mute)
 314                 wm8731_write(codec, WM8731_APDIGI, mute_reg | 0x8);
 315         else
 316                 wm8731_write(codec, WM8731_APDIGI, mute_reg);
 317         return 0;
 318 }
 319
 320 static int wm8731_set_dai_sysclk(struct snd_soc_dai *codec_dai,
 321                 int clk_id, unsigned int freq, int dir)
 322 {
 323         struct snd_soc_codec *codec = codec_dai->codec;
 324         struct wm8731_priv *wm8731 = codec->private_data;
 325
 326         switch (freq) {
 327         case 11289600:
 328         case 12000000:
 329         case 12288000:
 330         case 16934400:
 331         case 18432000:
 332                 wm8731->sysclk = freq;
 333                 return 0;
 334         }
 335         return -EINVAL;
 336 }
 337
 338
 339 static int wm8731_set_dai_fmt(struct snd_soc_dai *codec_dai,
 340                 unsigned int fmt)
 341 {
 342         struct snd_soc_codec *codec = codec_dai->codec;
 343         u16 iface = 0;
 344
 345         /* set master/slave audio interface */
 346         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 347         case SND_SOC_DAIFMT_CBM_CFM:
 348                 iface |= 0x0040;
 349                 break;
 350         case SND_SOC_DAIFMT_CBS_CFS:
 351                 break;
 352         default:
 353                 return -EINVAL;
 354         }
 355
 356         /* interface format */
 357         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 358         case SND_SOC_DAIFMT_I2S:
 359                 iface |= 0x0002;
 360                 break;
 361         case SND_SOC_DAIFMT_RIGHT_J:
 362                 break;
 363         case SND_SOC_DAIFMT_LEFT_J:
 364                 iface |= 0x0001;
 365                 break;
 366         case SND_SOC_DAIFMT_DSP_A:
 367                 iface |= 0x0003;
 368                 break;
 369         case SND_SOC_DAIFMT_DSP_B:
 370                 iface |= 0x0013;
 371                 break;
 372         default:
 373                 return -EINVAL;
 374         }
 375
 376         /* clock inversion */
 377         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 378         case SND_SOC_DAIFMT_NB_NF:
 379                 break;
 380         case SND_SOC_DAIFMT_IB_IF:
 381                 iface |= 0x0090;
 382                 break;
 383         case SND_SOC_DAIFMT_IB_NF:
 384                 iface |= 0x0080;
 385                 break;
 386         case SND_SOC_DAIFMT_NB_IF:
 387                 iface |= 0x0010;
 388                 break;
 389         default:
 390                 return -EINVAL;
 391         }
 392
 393         /* set iface */
 394         wm8731_write(codec, WM8731_IFACE, iface);
 395         return 0;
 396 }
 397
 398 static int wm8731_set_bias_level(struct snd_soc_codec *codec,
 399                                  enum snd_soc_bias_level level)
 400 {
 401         u16 reg = wm8731_read_reg_cache(codec, WM8731_PWR) & 0xff7f;
 402
 403         switch (level) {
 404         case SND_SOC_BIAS_ON:
 405                 /* vref/mid, osc on, dac unmute */
 406                 wm8731_write(codec, WM8731_PWR, reg);
 407                 break;
 408         case SND_SOC_BIAS_PREPARE:
 409                 break;
 410         case SND_SOC_BIAS_STANDBY:
 411                 /* everything off except vref/vmid, */
 412                 wm8731_write(codec, WM8731_PWR, reg | 0x0040);
 413                 break;
 414         case SND_SOC_BIAS_OFF:
 415                 /* everything off, dac mute, inactive */
 416                 wm8731_write(codec, WM8731_ACTIVE, 0x0);
 417                 wm8731_write(codec, WM8731_PWR, 0xffff);
 418                 break;
 419         }
 420         codec->bias_level = level;
 421         return 0;
 422 }
 423
 424 #define WM8731_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
 425                 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 |\
 426                 SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\
 427                 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |\
 428                 SNDRV_PCM_RATE_96000)
 429
 430 #define WM8731_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
 431         SNDRV_PCM_FMTBIT_S24_LE)
 432
 433 struct snd_soc_dai wm8731_dai = {
 434         .name = "WM8731",
 435         .playback = {
 436                 .stream_name = "Playback",
 437                 .channels_min = 1,
 438                 .channels_max = 2,
 439                 .rates = WM8731_RATES,
 440                 .formats = WM8731_FORMATS,},
 441         .capture = {
 442                 .stream_name = "Capture",
 443                 .channels_min = 1,
 444                 .channels_max = 2,
 445                 .rates = WM8731_RATES,
 446                 .formats = WM8731_FORMATS,},
 447         .ops = {
 448                 .prepare = wm8731_pcm_prepare,
 449                 .hw_params = wm8731_hw_params,
 450                 .shutdown = wm8731_shutdown,
 451                 .digital_mute = wm8731_mute,
 452                 .set_sysclk = wm8731_set_dai_sysclk,
 453                 .set_fmt = wm8731_set_dai_fmt,
 454         }
 455 };
 456 EXPORT_SYMBOL_GPL(wm8731_dai);
 457
 458 static int wm8731_suspend(struct platform_device *pdev, pm_message_t state)
 459 {
 460         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 461         struct snd_soc_codec *codec = socdev->codec;
 462
 463         wm8731_write(codec, WM8731_ACTIVE, 0x0);
 464         wm8731_set_bias_level(codec, SND_SOC_BIAS_OFF);
 465         return 0;
 466 }
 467
 468 static int wm8731_resume(struct platform_device *pdev)
 469 {
 470         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 471         struct snd_soc_codec *codec = socdev->codec;
 472         int i;
 473         u8 data[2];
 474         u16 *cache = codec->reg_cache;
 475
 476         /* Sync reg_cache with the hardware */
 477         for (i = 0; i < ARRAY_SIZE(wm8731_reg); i++) {
 478                 data[0] = (i << 1) | ((cache[i] >> 8) & 0x0001);
 479                 data[1] = cache[i] & 0x00ff;
 480                 codec->hw_write(codec->control_data, data, 2);
 481         }
 482         wm8731_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 483         wm8731_set_bias_level(codec, codec->suspend_bias_level);
 484         return 0;
 485 }
 486
 487 /*
 488  * initialise the WM8731 driver
 489  * register the mixer and dsp interfaces with the kernel
 490  */
 491 static int wm8731_init(struct snd_soc_device *socdev)
 492 {
 493         struct snd_soc_codec *codec = socdev->codec;
 494         int reg, ret = 0;
 495
 496         codec->name = "WM8731";
 497         codec->owner = THIS_MODULE;
 498         codec->read = wm8731_read_reg_cache;
 499         codec->write = wm8731_write;
 500         codec->set_bias_level = wm8731_set_bias_level;
 501         codec->dai = &wm8731_dai;
 502         codec->num_dai = 1;
 503         codec->reg_cache_size = ARRAY_SIZE(wm8731_reg);
 504         codec->reg_cache = kmemdup(wm8731_reg, sizeof(wm8731_reg), GFP_KERNEL);
 505         if (codec->reg_cache == NULL)
 506                 return -ENOMEM;
 507
 508         wm8731_reset(codec);
 509
 510         /* register pcms */
 511         ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
 512         if (ret < 0) {
 513                 printk(KERN_ERR "wm8731: failed to create pcms\n");
 514                 goto pcm_err;
 515         }
 516
 517         /* power on device */
 518         wm8731_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 519
 520         /* set the update bits */
 521         reg = wm8731_read_reg_cache(codec, WM8731_LOUT1V);
 522         wm8731_write(codec, WM8731_LOUT1V, reg & ~0x0100);
 523         reg = wm8731_read_reg_cache(codec, WM8731_ROUT1V);
 524         wm8731_write(codec, WM8731_ROUT1V, reg & ~0x0100);
 525         reg = wm8731_read_reg_cache(codec, WM8731_LINVOL);
 526         wm8731_write(codec, WM8731_LINVOL, reg & ~0x0100);
 527         reg = wm8731_read_reg_cache(codec, WM8731_RINVOL);
 528         wm8731_write(codec, WM8731_RINVOL, reg & ~0x0100);
 529
 530         snd_soc_add_controls(codec, wm8731_snd_controls,
 531                                 ARRAY_SIZE(wm8731_snd_controls));
 532         wm8731_add_widgets(codec);
 533         ret = snd_soc_init_card(socdev);
 534         if (ret < 0) {
 535                 printk(KERN_ERR "wm8731: failed to register card\n");
 536                 goto card_err;
 537         }
 538
 539         return ret;
 540
 541 card_err:
 542         snd_soc_free_pcms(socdev);
 543         snd_soc_dapm_free(socdev);
 544 pcm_err:
 545         kfree(codec->reg_cache);
 546         return ret;
 547 }
 548
 549 static struct snd_soc_device *wm8731_socdev;
 550
 551 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 552
 553 /*
 554  * WM8731 2 wire address is determined by GPIO5
 555  * state during powerup.
 556  *    low  = 0x1a
 557  *    high = 0x1b
 558  */
 559
 560 static int wm8731_i2c_probe(struct i2c_client *i2c,
 561                             const struct i2c_device_id *id)
 562 {
 563         struct snd_soc_device *socdev = wm8731_socdev;
 564         struct snd_soc_codec *codec = socdev->codec;
 565         int ret;
 566
 567         i2c_set_clientdata(i2c, codec);
 568         codec->control_data = i2c;
 569
 570         ret = wm8731_init(socdev);
 571         if (ret < 0)
 572                 pr_err("failed to initialise WM8731\n");
 573
 574         return ret;
 575 }
 576
 577 static int wm8731_i2c_remove(struct i2c_client *client)
 578 {
 579         struct snd_soc_codec *codec = i2c_get_clientdata(client);
 580         kfree(codec->reg_cache);
 581         return 0;
 582 }
 583
 584 static const struct i2c_device_id wm8731_i2c_id[] = {
 585         { "wm8731", 0 },
 586         { }
 587 };
 588 MODULE_DEVICE_TABLE(i2c, wm8731_i2c_id);
 589
 590 static struct i2c_driver wm8731_i2c_driver = {
 591         .driver = {
 592                 .name = "WM8731 I2C Codec",
 593                 .owner = THIS_MODULE,
 594         },
 595         .probe =    wm8731_i2c_probe,
 596         .remove =   wm8731_i2c_remove,
 597         .id_table = wm8731_i2c_id,
 598 };
 599
 600 static int wm8731_add_i2c_device(struct platform_device *pdev,
 601                                  const struct wm8731_setup_data *setup)
 602 {
 603         struct i2c_board_info info;
 604         struct i2c_adapter *adapter;
 605         struct i2c_client *client;
 606         int ret;
 607
 608         ret = i2c_add_driver(&wm8731_i2c_driver);
 609         if (ret != 0) {
 610                 dev_err(&pdev->dev, "can't add i2c driver\n");
 611                 return ret;
 612         }
 613
 614         memset(&info, 0, sizeof(struct i2c_board_info));
 615         info.addr = setup->i2c_address;
 616         strlcpy(info.type, "wm8731", I2C_NAME_SIZE);
 617
 618         adapter = i2c_get_adapter(setup->i2c_bus);
 619         if (!adapter) {
 620                 dev_err(&pdev->dev, "can't get i2c adapter %d\n",
 621                         setup->i2c_bus);
 622                 goto err_driver;
 623         }
 624
 625         client = i2c_new_device(adapter, &info);
 626         i2c_put_adapter(adapter);
 627         if (!client) {
 628                 dev_err(&pdev->dev, "can't add i2c device at 0x%x\n",
 629                         (unsigned int)info.addr);
 630                 goto err_driver;
 631         }
 632
 633         return 0;
 634
 635 err_driver:
 636         i2c_del_driver(&wm8731_i2c_driver);
 637         return -ENODEV;
 638 }
 639 #endif
 640
 641 #if defined(CONFIG_SPI_MASTER)
 642 static int __devinit wm8731_spi_probe(struct spi_device *spi)
 643 {
 644         struct snd_soc_device *socdev = wm8731_socdev;
 645         struct snd_soc_codec *codec = socdev->codec;
 646         int ret;
 647
 648         codec->control_data = spi;
 649
 650         ret = wm8731_init(socdev);
 651         if (ret < 0)
 652                 dev_err(&spi->dev, "failed to initialise WM8731\n");
 653
 654         return ret;
 655 }
 656
 657 static int __devexit wm8731_spi_remove(struct spi_device *spi)
 658 {
 659         return 0;
 660 }
 661
 662 static struct spi_driver wm8731_spi_driver = {
 663         .driver = {
 664                 .name   = "wm8731",
 665                 .bus    = &spi_bus_type,
 666                 .owner  = THIS_MODULE,
 667         },
 668         .probe          = wm8731_spi_probe,
 669         .remove         = __devexit_p(wm8731_spi_remove),
 670 };
 671
 672 static int wm8731_spi_write(struct spi_device *spi, const char *data, int len)
 673 {
 674         struct spi_transfer t;
 675         struct spi_message m;
 676         u8 msg[2];
 677
 678         if (len <= 0)
 679                 return 0;
 680
 681         msg[0] = data[0];
 682         msg[1] = data[1];
 683
 684         spi_message_init(&m);
 685         memset(&t, 0, (sizeof t));
 686
 687         t.tx_buf = &msg[0];
 688         t.len = len;
 689
 690         spi_message_add_tail(&t, &m);
 691         spi_sync(spi, &m);
 692
 693         return len;
 694 }
 695 #endif /* CONFIG_SPI_MASTER */
 696
 697 static int wm8731_probe(struct platform_device *pdev)
 698 {
 699         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 700         struct wm8731_setup_data *setup;
 701         struct snd_soc_codec *codec;
 702         struct wm8731_priv *wm8731;
 703         int ret = 0;
 704
 705         pr_info("WM8731 Audio Codec %s", WM8731_VERSION);
 706
 707         setup = socdev->codec_data;
 708         codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
 709         if (codec == NULL)
 710                 return -ENOMEM;
 711
 712         wm8731 = kzalloc(sizeof(struct wm8731_priv), GFP_KERNEL);
 713         if (wm8731 == NULL) {
 714                 kfree(codec);
 715                 return -ENOMEM;
 716         }
 717
 718         codec->private_data = wm8731;
 719         socdev->codec = codec;
 720         mutex_init(&codec->mutex);
 721         INIT_LIST_HEAD(&codec->dapm_widgets);
 722         INIT_LIST_HEAD(&codec->dapm_paths);
 723
 724         wm8731_socdev = socdev;
 725         ret = -ENODEV;
 726
 727 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 728         if (setup->i2c_address) {
 729                 codec->hw_write = (hw_write_t)i2c_master_send;
 730                 ret = wm8731_add_i2c_device(pdev, setup);
 731         }
 732 #endif
 733 #if defined(CONFIG_SPI_MASTER)
 734         if (setup->spi) {
 735                 codec->hw_write = (hw_write_t)wm8731_spi_write;
 736                 ret = spi_register_driver(&wm8731_spi_driver);
 737                 if (ret != 0)
 738                         printk(KERN_ERR "can't add spi driver");
 739         }
 740 #endif
 741
 742         if (ret != 0) {
 743                 kfree(codec->private_data);
 744                 kfree(codec);
 745         }
 746         return ret;
 747 }
 748
 749 /* power down chip */
 750 static int wm8731_remove(struct platform_device *pdev)
 751 {
 752         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 753         struct snd_soc_codec *codec = socdev->codec;
 754
 755         if (codec->control_data)
 756                 wm8731_set_bias_level(codec, SND_SOC_BIAS_OFF);
 757
 758         snd_soc_free_pcms(socdev);
 759         snd_soc_dapm_free(socdev);
 760 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 761         i2c_unregister_device(codec->control_data);
 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         kfree(codec->private_data);
 768         kfree(codec);
 769
 770         return 0;
 771 }
 772
 773 struct snd_soc_codec_device soc_codec_dev_wm8731 = {
 774         .probe =        wm8731_probe,
 775         .remove =       wm8731_remove,
 776         .suspend =      wm8731_suspend,
 777         .resume =       wm8731_resume,
 778 };
 779 EXPORT_SYMBOL_GPL(soc_codec_dev_wm8731);
 780
 781 static int __init wm8731_modinit(void)
 782 {
 783         return snd_soc_register_dai(&wm8731_dai);
 784 }
 785 module_init(wm8731_modinit);
 786
 787 static void __exit wm8731_exit(void)
 788 {
 789         snd_soc_unregister_dai(&wm8731_dai);
 790 }
 791 module_exit(wm8731_exit);
 792
 793 MODULE_DESCRIPTION("ASoC WM8731 driver");
 794 MODULE_AUTHOR("Richard Purdie");
 795 MODULE_LICENSE("GPL");