sound/soc/codecs/wm8523.c

   1 /*
   2  * wm8523.c  --  WM8523 ALSA SoC Audio driver
   3  *
   4  * Copyright 2009 Wolfson Microelectronics plc
   5  *
   6  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   7  *
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/moduleparam.h>
  16 #include <linux/init.h>
  17 #include <linux/delay.h>
  18 #include <linux/pm.h>
  19 #include <linux/i2c.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/regulator/consumer.h>
  22 #include <sound/core.h>
  23 #include <sound/pcm.h>
  24 #include <sound/pcm_params.h>
  25 #include <sound/soc.h>
  26 #include <sound/soc-dapm.h>
  27 #include <sound/initval.h>
  28 #include <sound/tlv.h>
  29
  30 #include "wm8523.h"
  31
  32 static struct snd_soc_codec *wm8523_codec;
  33 struct snd_soc_codec_device soc_codec_dev_wm8523;
  34
  35 #define WM8523_NUM_SUPPLIES 2
  36 static const char *wm8523_supply_names[WM8523_NUM_SUPPLIES] = {
  37         "AVDD",
  38         "LINEVDD",
  39 };
  40
  41 #define WM8523_NUM_RATES 7
  42
  43 /* codec private data */
  44 struct wm8523_priv {
  45         struct snd_soc_codec codec;
  46         u16 reg_cache[WM8523_REGISTER_COUNT];
  47         struct regulator_bulk_data supplies[WM8523_NUM_SUPPLIES];
  48         unsigned int sysclk;
  49         unsigned int rate_constraint_list[WM8523_NUM_RATES];
  50         struct snd_pcm_hw_constraint_list rate_constraint;
  51 };
  52
  53 static const u16 wm8523_reg[WM8523_REGISTER_COUNT] = {
  54         0x8523,     /* R0 - DEVICE_ID */
  55         0x0001,     /* R1 - REVISION */
  56         0x0000,     /* R2 - PSCTRL1 */
  57         0x1812,     /* R3 - AIF_CTRL1 */
  58         0x0000,     /* R4 - AIF_CTRL2 */
  59         0x0001,     /* R5 - DAC_CTRL3 */
  60         0x0190,     /* R6 - DAC_GAINL */
  61         0x0190,     /* R7 - DAC_GAINR */
  62         0x0000,     /* R8 - ZERO_DETECT */
  63 };
  64
  65 static int wm8523_volatile_register(unsigned int reg)
  66 {
  67         switch (reg) {
  68         case WM8523_DEVICE_ID:
  69         case WM8523_REVISION:
  70                 return 1;
  71         default:
  72                 return 0;
  73         }
  74 }
  75
  76 static int wm8523_reset(struct snd_soc_codec *codec)
  77 {
  78         return snd_soc_write(codec, WM8523_DEVICE_ID, 0);
  79 }
  80
  81 static const DECLARE_TLV_DB_SCALE(dac_tlv, -10000, 25, 0);
  82
  83 static const char *wm8523_zd_count_text[] = {
  84         "1024",
  85         "2048",
  86 };
  87
  88 static const struct soc_enum wm8523_zc_count =
  89         SOC_ENUM_SINGLE(WM8523_ZERO_DETECT, 0, 2, wm8523_zd_count_text);
  90
  91 static const struct snd_kcontrol_new wm8523_snd_controls[] = {
  92 SOC_DOUBLE_R_TLV("Playback Volume", WM8523_DAC_GAINL, WM8523_DAC_GAINR,
  93                  0, 448, 0, dac_tlv),
  94 SOC_SINGLE("ZC Switch", WM8523_DAC_CTRL3, 4, 1, 0),
  95 SOC_SINGLE("Playback Deemphasis Switch", WM8523_AIF_CTRL1, 8, 1, 0),
  96 SOC_DOUBLE("Playback Switch", WM8523_DAC_CTRL3, 2, 3, 1, 1),
  97 SOC_SINGLE("Volume Ramp Up Switch", WM8523_DAC_CTRL3, 1, 1, 0),
  98 SOC_SINGLE("Volume Ramp Down Switch", WM8523_DAC_CTRL3, 0, 1, 0),
  99 SOC_ENUM("Zero Detect Count", wm8523_zc_count),
 100 };
 101
 102 static const struct snd_soc_dapm_widget wm8523_dapm_widgets[] = {
 103 SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0),
 104 SND_SOC_DAPM_OUTPUT("LINEVOUTL"),
 105 SND_SOC_DAPM_OUTPUT("LINEVOUTR"),
 106 };
 107
 108 static const struct snd_soc_dapm_route intercon[] = {
 109         { "LINEVOUTL", NULL, "DAC" },
 110         { "LINEVOUTR", NULL, "DAC" },
 111 };
 112
 113 static int wm8523_add_widgets(struct snd_soc_codec *codec)
 114 {
 115         snd_soc_dapm_new_controls(codec, wm8523_dapm_widgets,
 116                                   ARRAY_SIZE(wm8523_dapm_widgets));
 117
 118         snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));
 119
 120         return 0;
 121 }
 122
 123 static struct {
 124         int value;
 125         int ratio;
 126 } lrclk_ratios[WM8523_NUM_RATES] = {
 127         { 1, 128 },
 128         { 2, 192 },
 129         { 3, 256 },
 130         { 4, 384 },
 131         { 5, 512 },
 132         { 6, 768 },
 133         { 7, 1152 },
 134 };
 135
 136 static int wm8523_startup(struct snd_pcm_substream *substream,
 137                           struct snd_soc_dai *dai)
 138 {
 139         struct snd_soc_codec *codec = dai->codec;
 140         struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec);
 141
 142         /* The set of sample rates that can be supported depends on the
 143          * MCLK supplied to the CODEC - enforce this.
 144          */
 145         if (!wm8523->sysclk) {
 146                 dev_err(codec->dev,
 147                         "No MCLK configured, call set_sysclk() on init\n");
 148                 return -EINVAL;
 149         }
 150
 151         return 0;
 152         snd_pcm_hw_constraint_list(substream->runtime, 0,
 153                                    SNDRV_PCM_HW_PARAM_RATE,
 154                                    &wm8523->rate_constraint);
 155
 156         return 0;
 157 }
 158
 159 static int wm8523_hw_params(struct snd_pcm_substream *substream,
 160                             struct snd_pcm_hw_params *params,
 161                             struct snd_soc_dai *dai)
 162 {
 163         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 164         struct snd_soc_device *socdev = rtd->socdev;
 165         struct snd_soc_codec *codec = socdev->card->codec;
 166         struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec);
 167         int i;
 168         u16 aifctrl1 = snd_soc_read(codec, WM8523_AIF_CTRL1);
 169         u16 aifctrl2 = snd_soc_read(codec, WM8523_AIF_CTRL2);
 170
 171         /* Find a supported LRCLK ratio */
 172         for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) {
 173                 if (wm8523->sysclk / params_rate(params) ==
 174                     lrclk_ratios[i].ratio)
 175                         break;
 176         }
 177
 178         /* Should never happen, should be handled by constraints */
 179         if (i == ARRAY_SIZE(lrclk_ratios)) {
 180                 dev_err(codec->dev, "MCLK/fs ratio %d unsupported\n",
 181                         wm8523->sysclk / params_rate(params));
 182                 return -EINVAL;
 183         }
 184
 185         aifctrl2 &= ~WM8523_SR_MASK;
 186         aifctrl2 |= lrclk_ratios[i].value;
 187
 188         aifctrl1 &= ~WM8523_WL_MASK;
 189         switch (params_format(params)) {
 190         case SNDRV_PCM_FORMAT_S16_LE:
 191                 break;
 192         case SNDRV_PCM_FORMAT_S20_3LE:
 193                 aifctrl1 |= 0x8;
 194                 break;
 195         case SNDRV_PCM_FORMAT_S24_LE:
 196                 aifctrl1 |= 0x10;
 197                 break;
 198         case SNDRV_PCM_FORMAT_S32_LE:
 199                 aifctrl1 |= 0x18;
 200                 break;
 201         }
 202
 203         snd_soc_write(codec, WM8523_AIF_CTRL1, aifctrl1);
 204         snd_soc_write(codec, WM8523_AIF_CTRL2, aifctrl2);
 205
 206         return 0;
 207 }
 208
 209 static int wm8523_set_dai_sysclk(struct snd_soc_dai *codec_dai,
 210                 int clk_id, unsigned int freq, int dir)
 211 {
 212         struct snd_soc_codec *codec = codec_dai->codec;
 213         struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec);
 214         unsigned int val;
 215         int i;
 216
 217         wm8523->sysclk = freq;
 218
 219         wm8523->rate_constraint.count = 0;
 220         for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) {
 221                 val = freq / lrclk_ratios[i].ratio;
 222                 /* Check that it's a standard rate since core can't
 223                  * cope with others and having the odd rates confuses
 224                  * constraint matching.
 225                  */
 226                 switch (val) {
 227                 case 8000:
 228                 case 11025:
 229                 case 16000:
 230                 case 22050:
 231                 case 32000:
 232                 case 44100:
 233                 case 48000:
 234                 case 64000:
 235                 case 88200:
 236                 case 96000:
 237                 case 176400:
 238                 case 192000:
 239                         dev_dbg(codec->dev, "Supported sample rate: %dHz\n",
 240                                 val);
 241                         wm8523->rate_constraint_list[i] = val;
 242                         wm8523->rate_constraint.count++;
 243                         break;
 244                 default:
 245                         dev_dbg(codec->dev, "Skipping sample rate: %dHz\n",
 246                                 val);
 247                 }
 248         }
 249
 250         /* Need at least one supported rate... */
 251         if (wm8523->rate_constraint.count == 0)
 252                 return -EINVAL;
 253
 254         return 0;
 255 }
 256
 257
 258 static int wm8523_set_dai_fmt(struct snd_soc_dai *codec_dai,
 259                 unsigned int fmt)
 260 {
 261         struct snd_soc_codec *codec = codec_dai->codec;
 262         u16 aifctrl1 = snd_soc_read(codec, WM8523_AIF_CTRL1);
 263
 264         aifctrl1 &= ~(WM8523_BCLK_INV_MASK | WM8523_LRCLK_INV_MASK |
 265                       WM8523_FMT_MASK | WM8523_AIF_MSTR_MASK);
 266
 267         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 268         case SND_SOC_DAIFMT_CBM_CFM:
 269                 aifctrl1 |= WM8523_AIF_MSTR;
 270                 break;
 271         case SND_SOC_DAIFMT_CBS_CFS:
 272                 break;
 273         default:
 274                 return -EINVAL;
 275         }
 276
 277         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 278         case SND_SOC_DAIFMT_I2S:
 279                 aifctrl1 |= 0x0002;
 280                 break;
 281         case SND_SOC_DAIFMT_RIGHT_J:
 282                 break;
 283         case SND_SOC_DAIFMT_LEFT_J:
 284                 aifctrl1 |= 0x0001;
 285                 break;
 286         case SND_SOC_DAIFMT_DSP_A:
 287                 aifctrl1 |= 0x0003;
 288                 break;
 289         case SND_SOC_DAIFMT_DSP_B:
 290                 aifctrl1 |= 0x0023;
 291                 break;
 292         default:
 293                 return -EINVAL;
 294         }
 295
 296         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 297         case SND_SOC_DAIFMT_NB_NF:
 298                 break;
 299         case SND_SOC_DAIFMT_IB_IF:
 300                 aifctrl1 |= WM8523_BCLK_INV | WM8523_LRCLK_INV;
 301                 break;
 302         case SND_SOC_DAIFMT_IB_NF:
 303                 aifctrl1 |= WM8523_BCLK_INV;
 304                 break;
 305         case SND_SOC_DAIFMT_NB_IF:
 306                 aifctrl1 |= WM8523_LRCLK_INV;
 307                 break;
 308         default:
 309                 return -EINVAL;
 310         }
 311
 312         snd_soc_write(codec, WM8523_AIF_CTRL1, aifctrl1);
 313
 314         return 0;
 315 }
 316
 317 static int wm8523_set_bias_level(struct snd_soc_codec *codec,
 318                                  enum snd_soc_bias_level level)
 319 {
 320         struct wm8523_priv *wm8523 = snd_soc_codec_get_drvdata(codec);
 321         int ret, i;
 322
 323         switch (level) {
 324         case SND_SOC_BIAS_ON:
 325                 break;
 326
 327         case SND_SOC_BIAS_PREPARE:
 328                 /* Full power on */
 329                 snd_soc_update_bits(codec, WM8523_PSCTRL1,
 330                                     WM8523_SYS_ENA_MASK, 3);
 331                 break;
 332
 333         case SND_SOC_BIAS_STANDBY:
 334                 if (codec->bias_level == SND_SOC_BIAS_OFF) {
 335                         ret = regulator_bulk_enable(ARRAY_SIZE(wm8523->supplies),
 336                                                     wm8523->supplies);
 337                         if (ret != 0) {
 338                                 dev_err(codec->dev,
 339                                         "Failed to enable supplies: %d\n",
 340                                         ret);
 341                                 return ret;
 342                         }
 343
 344                         /* Initial power up */
 345                         snd_soc_update_bits(codec, WM8523_PSCTRL1,
 346                                             WM8523_SYS_ENA_MASK, 1);
 347
 348                         /* Sync back default/cached values */
 349                         for (i = WM8523_AIF_CTRL1;
 350                              i < WM8523_MAX_REGISTER; i++)
 351                                 snd_soc_write(codec, i, wm8523->reg_cache[i]);
 352
 353
 354                         msleep(100);
 355                 }
 356
 357                 /* Power up to mute */
 358                 snd_soc_update_bits(codec, WM8523_PSCTRL1,
 359                                     WM8523_SYS_ENA_MASK, 2);
 360
 361                 break;
 362
 363         case SND_SOC_BIAS_OFF:
 364                 /* The chip runs through the power down sequence for us. */
 365                 snd_soc_update_bits(codec, WM8523_PSCTRL1,
 366                                     WM8523_SYS_ENA_MASK, 0);
 367                 msleep(100);
 368
 369                 regulator_bulk_disable(ARRAY_SIZE(wm8523->supplies),
 370                                        wm8523->supplies);
 371                 break;
 372         }
 373         codec->bias_level = level;
 374         return 0;
 375 }
 376
 377 #define WM8523_RATES SNDRV_PCM_RATE_8000_192000
 378
 379 #define WM8523_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
 380                         SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)
 381
 382 static struct snd_soc_dai_ops wm8523_dai_ops = {
 383         .startup        = wm8523_startup,
 384         .hw_params      = wm8523_hw_params,
 385         .set_sysclk     = wm8523_set_dai_sysclk,
 386         .set_fmt        = wm8523_set_dai_fmt,
 387 };
 388
 389 struct snd_soc_dai wm8523_dai = {
 390         .name = "WM8523",
 391         .playback = {
 392                 .stream_name = "Playback",
 393                 .channels_min = 2,  /* Mono modes not yet supported */
 394                 .channels_max = 2,
 395                 .rates = WM8523_RATES,
 396                 .formats = WM8523_FORMATS,
 397         },
 398         .ops = &wm8523_dai_ops,
 399 };
 400 EXPORT_SYMBOL_GPL(wm8523_dai);
 401
 402 #ifdef CONFIG_PM
 403 static int wm8523_suspend(struct platform_device *pdev, pm_message_t state)
 404 {
 405         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 406         struct snd_soc_codec *codec = socdev->card->codec;
 407
 408         wm8523_set_bias_level(codec, SND_SOC_BIAS_OFF);
 409         return 0;
 410 }
 411
 412 static int wm8523_resume(struct platform_device *pdev)
 413 {
 414         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 415         struct snd_soc_codec *codec = socdev->card->codec;
 416
 417         wm8523_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 418
 419         return 0;
 420 }
 421 #else
 422 #define wm8523_suspend NULL
 423 #define wm8523_resume NULL
 424 #endif
 425
 426 static int wm8523_probe(struct platform_device *pdev)
 427 {
 428         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 429         struct snd_soc_codec *codec;
 430         int ret = 0;
 431
 432         if (wm8523_codec == NULL) {
 433                 dev_err(&pdev->dev, "Codec device not registered\n");
 434                 return -ENODEV;
 435         }
 436
 437         socdev->card->codec = wm8523_codec;
 438         codec = wm8523_codec;
 439
 440         /* register pcms */
 441         ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
 442         if (ret < 0) {
 443                 dev_err(codec->dev, "failed to create pcms: %d\n", ret);
 444                 goto pcm_err;
 445         }
 446
 447         snd_soc_add_controls(codec, wm8523_snd_controls,
 448                              ARRAY_SIZE(wm8523_snd_controls));
 449         wm8523_add_widgets(codec);
 450
 451         return ret;
 452
 453 pcm_err:
 454         return ret;
 455 }
 456
 457 static int wm8523_remove(struct platform_device *pdev)
 458 {
 459         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 460
 461         snd_soc_free_pcms(socdev);
 462         snd_soc_dapm_free(socdev);
 463
 464         return 0;
 465 }
 466
 467 struct snd_soc_codec_device soc_codec_dev_wm8523 = {
 468         .probe =        wm8523_probe,
 469         .remove =       wm8523_remove,
 470         .suspend =      wm8523_suspend,
 471         .resume =       wm8523_resume,
 472 };
 473 EXPORT_SYMBOL_GPL(soc_codec_dev_wm8523);
 474
 475 static int wm8523_register(struct wm8523_priv *wm8523,
 476                            enum snd_soc_control_type control)
 477 {
 478         int ret;
 479         struct snd_soc_codec *codec = &wm8523->codec;
 480         int i;
 481
 482         if (wm8523_codec) {
 483                 dev_err(codec->dev, "Another WM8523 is registered\n");
 484                 return -EINVAL;
 485         }
 486
 487         mutex_init(&codec->mutex);
 488         INIT_LIST_HEAD(&codec->dapm_widgets);
 489         INIT_LIST_HEAD(&codec->dapm_paths);
 490
 491         snd_soc_codec_set_drvdata(codec, wm8523);
 492         codec->name = "WM8523";
 493         codec->owner = THIS_MODULE;
 494         codec->bias_level = SND_SOC_BIAS_OFF;
 495         codec->set_bias_level = wm8523_set_bias_level;
 496         codec->dai = &wm8523_dai;
 497         codec->num_dai = 1;
 498         codec->reg_cache_size = WM8523_REGISTER_COUNT;
 499         codec->reg_cache = &wm8523->reg_cache;
 500         codec->volatile_register = wm8523_volatile_register;
 501
 502         wm8523->rate_constraint.list = &wm8523->rate_constraint_list[0];
 503         wm8523->rate_constraint.count =
 504                 ARRAY_SIZE(wm8523->rate_constraint_list);
 505
 506         memcpy(codec->reg_cache, wm8523_reg, sizeof(wm8523_reg));
 507
 508         ret = snd_soc_codec_set_cache_io(codec, 8, 16, control);
 509         if (ret != 0) {
 510                 dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
 511                 goto err;
 512         }
 513
 514         for (i = 0; i < ARRAY_SIZE(wm8523->supplies); i++)
 515                 wm8523->supplies[i].supply = wm8523_supply_names[i];
 516
 517         ret = regulator_bulk_get(codec->dev, ARRAY_SIZE(wm8523->supplies),
 518                                  wm8523->supplies);
 519         if (ret != 0) {
 520                 dev_err(codec->dev, "Failed to request supplies: %d\n", ret);
 521                 goto err;
 522         }
 523
 524         ret = regulator_bulk_enable(ARRAY_SIZE(wm8523->supplies),
 525                                     wm8523->supplies);
 526         if (ret != 0) {
 527                 dev_err(codec->dev, "Failed to enable supplies: %d\n", ret);
 528                 goto err_get;
 529         }
 530
 531         ret = snd_soc_read(codec, WM8523_DEVICE_ID);
 532         if (ret < 0) {
 533                 dev_err(codec->dev, "Failed to read ID register\n");
 534                 goto err_enable;
 535         }
 536         if (ret != wm8523_reg[WM8523_DEVICE_ID]) {
 537                 dev_err(codec->dev, "Device is not a WM8523, ID is %x\n", ret);
 538                 ret = -EINVAL;
 539                 goto err_enable;
 540         }
 541
 542         ret = snd_soc_read(codec, WM8523_REVISION);
 543         if (ret < 0) {
 544                 dev_err(codec->dev, "Failed to read revision register\n");
 545                 goto err_enable;
 546         }
 547         dev_info(codec->dev, "revision %c\n",
 548                  (ret & WM8523_CHIP_REV_MASK) + 'A');
 549
 550         ret = wm8523_reset(codec);
 551         if (ret < 0) {
 552                 dev_err(codec->dev, "Failed to issue reset\n");
 553                 goto err_enable;
 554         }
 555
 556         wm8523_dai.dev = codec->dev;
 557
 558         /* Change some default settings - latch VU and enable ZC */
 559         wm8523->reg_cache[WM8523_DAC_GAINR] |= WM8523_DACR_VU;
 560         wm8523->reg_cache[WM8523_DAC_CTRL3] |= WM8523_ZC;
 561
 562         wm8523_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 563
 564         /* Bias level configuration will have done an extra enable */
 565         regulator_bulk_disable(ARRAY_SIZE(wm8523->supplies), wm8523->supplies);
 566
 567         wm8523_codec = codec;
 568
 569         ret = snd_soc_register_codec(codec);
 570         if (ret != 0) {
 571                 dev_err(codec->dev, "Failed to register codec: %d\n", ret);
 572                 return ret;
 573         }
 574
 575         ret = snd_soc_register_dai(&wm8523_dai);
 576         if (ret != 0) {
 577                 dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
 578                 snd_soc_unregister_codec(codec);
 579                 return ret;
 580         }
 581
 582         return 0;
 583
 584 err_enable:
 585         regulator_bulk_disable(ARRAY_SIZE(wm8523->supplies), wm8523->supplies);
 586 err_get:
 587         regulator_bulk_free(ARRAY_SIZE(wm8523->supplies), wm8523->supplies);
 588 err:
 589         kfree(wm8523);
 590         return ret;
 591 }
 592
 593 static void wm8523_unregister(struct wm8523_priv *wm8523)
 594 {
 595         wm8523_set_bias_level(&wm8523->codec, SND_SOC_BIAS_OFF);
 596         regulator_bulk_free(ARRAY_SIZE(wm8523->supplies), wm8523->supplies);
 597         snd_soc_unregister_dai(&wm8523_dai);
 598         snd_soc_unregister_codec(&wm8523->codec);
 599         kfree(wm8523);
 600         wm8523_codec = NULL;
 601 }
 602
 603 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 604 static __devinit int wm8523_i2c_probe(struct i2c_client *i2c,
 605                                       const struct i2c_device_id *id)
 606 {
 607         struct wm8523_priv *wm8523;
 608         struct snd_soc_codec *codec;
 609
 610         wm8523 = kzalloc(sizeof(struct wm8523_priv), GFP_KERNEL);
 611         if (wm8523 == NULL)
 612                 return -ENOMEM;
 613
 614         codec = &wm8523->codec;
 615         codec->hw_write = (hw_write_t)i2c_master_send;
 616
 617         i2c_set_clientdata(i2c, wm8523);
 618         codec->control_data = i2c;
 619
 620         codec->dev = &i2c->dev;
 621
 622         return wm8523_register(wm8523, SND_SOC_I2C);
 623 }
 624
 625 static __devexit int wm8523_i2c_remove(struct i2c_client *client)
 626 {
 627         struct wm8523_priv *wm8523 = i2c_get_clientdata(client);
 628         wm8523_unregister(wm8523);
 629         return 0;
 630 }
 631
 632 static const struct i2c_device_id wm8523_i2c_id[] = {
 633         { "wm8523", 0 },
 634         { }
 635 };
 636 MODULE_DEVICE_TABLE(i2c, wm8523_i2c_id);
 637
 638 static struct i2c_driver wm8523_i2c_driver = {
 639         .driver = {
 640                 .name = "WM8523",
 641                 .owner = THIS_MODULE,
 642         },
 643         .probe =    wm8523_i2c_probe,
 644         .remove =   __devexit_p(wm8523_i2c_remove),
 645         .id_table = wm8523_i2c_id,
 646 };
 647 #endif
 648
 649 static int __init wm8523_modinit(void)
 650 {
 651         int ret;
 652 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 653         ret = i2c_add_driver(&wm8523_i2c_driver);
 654         if (ret != 0) {
 655                 printk(KERN_ERR "Failed to register WM8523 I2C driver: %d\n",
 656                        ret);
 657         }
 658 #endif
 659         return 0;
 660 }
 661 module_init(wm8523_modinit);
 662
 663 static void __exit wm8523_exit(void)
 664 {
 665 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 666         i2c_del_driver(&wm8523_i2c_driver);
 667 #endif
 668 }
 669 module_exit(wm8523_exit);
 670
 671 MODULE_DESCRIPTION("ASoC WM8523 driver");
 672 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 673 MODULE_LICENSE("GPL");