sound/soc/codecs/ak4535.c

   1 /*
   2  * ak4535.c  --  AK4535 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/slab.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/initval.h>
  28
  29 #include "ak4535.h"
  30
  31 #define AK4535_VERSION "0.3"
  32
  33 /* codec private data */
  34 struct ak4535_priv {
  35         unsigned int sysclk;
  36         enum snd_soc_control_type control_type;
  37         void *control_data;
  38 };
  39
  40 /*
  41  * ak4535 register cache
  42  */
  43 static const u16 ak4535_reg[AK4535_CACHEREGNUM] = {
  44     0x0000, 0x0080, 0x0000, 0x0003,
  45     0x0002, 0x0000, 0x0011, 0x0001,
  46     0x0000, 0x0040, 0x0036, 0x0010,
  47     0x0000, 0x0000, 0x0057, 0x0000,
  48 };
  49
  50 /*
  51  * read ak4535 register cache
  52  */
  53 static inline unsigned int ak4535_read_reg_cache(struct snd_soc_codec *codec,
  54         unsigned int reg)
  55 {
  56         u16 *cache = codec->reg_cache;
  57         if (reg >= AK4535_CACHEREGNUM)
  58                 return -1;
  59         return cache[reg];
  60 }
  61
  62 /*
  63  * write ak4535 register cache
  64  */
  65 static inline void ak4535_write_reg_cache(struct snd_soc_codec *codec,
  66         u16 reg, unsigned int value)
  67 {
  68         u16 *cache = codec->reg_cache;
  69         if (reg >= AK4535_CACHEREGNUM)
  70                 return;
  71         cache[reg] = value;
  72 }
  73
  74 /*
  75  * write to the AK4535 register space
  76  */
  77 static int ak4535_write(struct snd_soc_codec *codec, unsigned int reg,
  78         unsigned int value)
  79 {
  80         u8 data[2];
  81
  82         /* data is
  83          *   D15..D8 AK4535 register offset
  84          *   D7...D0 register data
  85          */
  86         data[0] = reg & 0xff;
  87         data[1] = value & 0xff;
  88
  89         ak4535_write_reg_cache(codec, reg, value);
  90         if (codec->hw_write(codec->control_data, data, 2) == 2)
  91                 return 0;
  92         else
  93                 return -EIO;
  94 }
  95
  96 static int ak4535_sync(struct snd_soc_codec *codec)
  97 {
  98         u16 *cache = codec->reg_cache;
  99         int i, r = 0;
 100
 101         for (i = 0; i < AK4535_CACHEREGNUM; i++)
 102                 r |= ak4535_write(codec, i, cache[i]);
 103
 104         return r;
 105 };
 106
 107 static const char *ak4535_mono_gain[] = {"+6dB", "-17dB"};
 108 static const char *ak4535_mono_out[] = {"(L + R)/2", "Hi-Z"};
 109 static const char *ak4535_hp_out[] = {"Stereo", "Mono"};
 110 static const char *ak4535_deemp[] = {"44.1kHz", "Off", "48kHz", "32kHz"};
 111 static const char *ak4535_mic_select[] = {"Internal", "External"};
 112
 113 static const struct soc_enum ak4535_enum[] = {
 114         SOC_ENUM_SINGLE(AK4535_SIG1, 7, 2, ak4535_mono_gain),
 115         SOC_ENUM_SINGLE(AK4535_SIG1, 6, 2, ak4535_mono_out),
 116         SOC_ENUM_SINGLE(AK4535_MODE2, 2, 2, ak4535_hp_out),
 117         SOC_ENUM_SINGLE(AK4535_DAC, 0, 4, ak4535_deemp),
 118         SOC_ENUM_SINGLE(AK4535_MIC, 1, 2, ak4535_mic_select),
 119 };
 120
 121 static const struct snd_kcontrol_new ak4535_snd_controls[] = {
 122         SOC_SINGLE("ALC2 Switch", AK4535_SIG1, 1, 1, 0),
 123         SOC_ENUM("Mono 1 Output", ak4535_enum[1]),
 124         SOC_ENUM("Mono 1 Gain", ak4535_enum[0]),
 125         SOC_ENUM("Headphone Output", ak4535_enum[2]),
 126         SOC_ENUM("Playback Deemphasis", ak4535_enum[3]),
 127         SOC_SINGLE("Bass Volume", AK4535_DAC, 2, 3, 0),
 128         SOC_SINGLE("Mic Boost (+20dB) Switch", AK4535_MIC, 0, 1, 0),
 129         SOC_ENUM("Mic Select", ak4535_enum[4]),
 130         SOC_SINGLE("ALC Operation Time", AK4535_TIMER, 0, 3, 0),
 131         SOC_SINGLE("ALC Recovery Time", AK4535_TIMER, 2, 3, 0),
 132         SOC_SINGLE("ALC ZC Time", AK4535_TIMER, 4, 3, 0),
 133         SOC_SINGLE("ALC 1 Switch", AK4535_ALC1, 5, 1, 0),
 134         SOC_SINGLE("ALC 2 Switch", AK4535_ALC1, 6, 1, 0),
 135         SOC_SINGLE("ALC Volume", AK4535_ALC2, 0, 127, 0),
 136         SOC_SINGLE("Capture Volume", AK4535_PGA, 0, 127, 0),
 137         SOC_SINGLE("Left Playback Volume", AK4535_LATT, 0, 127, 1),
 138         SOC_SINGLE("Right Playback Volume", AK4535_RATT, 0, 127, 1),
 139         SOC_SINGLE("AUX Bypass Volume", AK4535_VOL, 0, 15, 0),
 140         SOC_SINGLE("Mic Sidetone Volume", AK4535_VOL, 4, 7, 0),
 141 };
 142
 143 /* Mono 1 Mixer */
 144 static const struct snd_kcontrol_new ak4535_mono1_mixer_controls[] = {
 145         SOC_DAPM_SINGLE("Mic Sidetone Switch", AK4535_SIG1, 4, 1, 0),
 146         SOC_DAPM_SINGLE("Mono Playback Switch", AK4535_SIG1, 5, 1, 0),
 147 };
 148
 149 /* Stereo Mixer */
 150 static const struct snd_kcontrol_new ak4535_stereo_mixer_controls[] = {
 151         SOC_DAPM_SINGLE("Mic Sidetone Switch", AK4535_SIG2, 4, 1, 0),
 152         SOC_DAPM_SINGLE("Playback Switch", AK4535_SIG2, 7, 1, 0),
 153         SOC_DAPM_SINGLE("Aux Bypass Switch", AK4535_SIG2, 5, 1, 0),
 154 };
 155
 156 /* Input Mixer */
 157 static const struct snd_kcontrol_new ak4535_input_mixer_controls[] = {
 158         SOC_DAPM_SINGLE("Mic Capture Switch", AK4535_MIC, 2, 1, 0),
 159         SOC_DAPM_SINGLE("Aux Capture Switch", AK4535_MIC, 5, 1, 0),
 160 };
 161
 162 /* Input mux */
 163 static const struct snd_kcontrol_new ak4535_input_mux_control =
 164         SOC_DAPM_ENUM("Input Select", ak4535_enum[4]);
 165
 166 /* HP L switch */
 167 static const struct snd_kcontrol_new ak4535_hpl_control =
 168         SOC_DAPM_SINGLE("Switch", AK4535_SIG2, 1, 1, 1);
 169
 170 /* HP R switch */
 171 static const struct snd_kcontrol_new ak4535_hpr_control =
 172         SOC_DAPM_SINGLE("Switch", AK4535_SIG2, 0, 1, 1);
 173
 174 /* mono 2 switch */
 175 static const struct snd_kcontrol_new ak4535_mono2_control =
 176         SOC_DAPM_SINGLE("Switch", AK4535_SIG1, 0, 1, 0);
 177
 178 /* Line out switch */
 179 static const struct snd_kcontrol_new ak4535_line_control =
 180         SOC_DAPM_SINGLE("Switch", AK4535_SIG2, 6, 1, 0);
 181
 182 /* ak4535 dapm widgets */
 183 static const struct snd_soc_dapm_widget ak4535_dapm_widgets[] = {
 184         SND_SOC_DAPM_MIXER("Stereo Mixer", SND_SOC_NOPM, 0, 0,
 185                 &ak4535_stereo_mixer_controls[0],
 186                 ARRAY_SIZE(ak4535_stereo_mixer_controls)),
 187         SND_SOC_DAPM_MIXER("Mono1 Mixer", SND_SOC_NOPM, 0, 0,
 188                 &ak4535_mono1_mixer_controls[0],
 189                 ARRAY_SIZE(ak4535_mono1_mixer_controls)),
 190         SND_SOC_DAPM_MIXER("Input Mixer", SND_SOC_NOPM, 0, 0,
 191                 &ak4535_input_mixer_controls[0],
 192                 ARRAY_SIZE(ak4535_input_mixer_controls)),
 193         SND_SOC_DAPM_MUX("Input Mux", SND_SOC_NOPM, 0, 0,
 194                 &ak4535_input_mux_control),
 195         SND_SOC_DAPM_DAC("DAC", "Playback", AK4535_PM2, 0, 0),
 196         SND_SOC_DAPM_SWITCH("Mono 2 Enable", SND_SOC_NOPM, 0, 0,
 197                 &ak4535_mono2_control),
 198         /* speaker powersave bit */
 199         SND_SOC_DAPM_PGA("Speaker Enable", AK4535_MODE2, 0, 0, NULL, 0),
 200         SND_SOC_DAPM_SWITCH("Line Out Enable", SND_SOC_NOPM, 0, 0,
 201                 &ak4535_line_control),
 202         SND_SOC_DAPM_SWITCH("Left HP Enable", SND_SOC_NOPM, 0, 0,
 203                 &ak4535_hpl_control),
 204         SND_SOC_DAPM_SWITCH("Right HP Enable", SND_SOC_NOPM, 0, 0,
 205                 &ak4535_hpr_control),
 206         SND_SOC_DAPM_OUTPUT("LOUT"),
 207         SND_SOC_DAPM_OUTPUT("HPL"),
 208         SND_SOC_DAPM_OUTPUT("ROUT"),
 209         SND_SOC_DAPM_OUTPUT("HPR"),
 210         SND_SOC_DAPM_OUTPUT("SPP"),
 211         SND_SOC_DAPM_OUTPUT("SPN"),
 212         SND_SOC_DAPM_OUTPUT("MOUT1"),
 213         SND_SOC_DAPM_OUTPUT("MOUT2"),
 214         SND_SOC_DAPM_OUTPUT("MICOUT"),
 215         SND_SOC_DAPM_ADC("ADC", "Capture", AK4535_PM1, 0, 0),
 216         SND_SOC_DAPM_PGA("Spk Amp", AK4535_PM2, 3, 0, NULL, 0),
 217         SND_SOC_DAPM_PGA("HP R Amp", AK4535_PM2, 1, 0, NULL, 0),
 218         SND_SOC_DAPM_PGA("HP L Amp", AK4535_PM2, 2, 0, NULL, 0),
 219         SND_SOC_DAPM_PGA("Mic", AK4535_PM1, 1, 0, NULL, 0),
 220         SND_SOC_DAPM_PGA("Line Out", AK4535_PM1, 4, 0, NULL, 0),
 221         SND_SOC_DAPM_PGA("Mono Out", AK4535_PM1, 3, 0, NULL, 0),
 222         SND_SOC_DAPM_PGA("AUX In", AK4535_PM1, 2, 0, NULL, 0),
 223
 224         SND_SOC_DAPM_MICBIAS("Mic Int Bias", AK4535_MIC, 3, 0),
 225         SND_SOC_DAPM_MICBIAS("Mic Ext Bias", AK4535_MIC, 4, 0),
 226         SND_SOC_DAPM_INPUT("MICIN"),
 227         SND_SOC_DAPM_INPUT("MICEXT"),
 228         SND_SOC_DAPM_INPUT("AUX"),
 229         SND_SOC_DAPM_INPUT("MIN"),
 230         SND_SOC_DAPM_INPUT("AIN"),
 231 };
 232
 233 static const struct snd_soc_dapm_route audio_map[] = {
 234         /*stereo mixer */
 235         {"Stereo Mixer", "Playback Switch", "DAC"},
 236         {"Stereo Mixer", "Mic Sidetone Switch", "Mic"},
 237         {"Stereo Mixer", "Aux Bypass Switch", "AUX In"},
 238
 239         /* mono1 mixer */
 240         {"Mono1 Mixer", "Mic Sidetone Switch", "Mic"},
 241         {"Mono1 Mixer", "Mono Playback Switch", "DAC"},
 242
 243         /* Mic */
 244         {"Mic", NULL, "AIN"},
 245         {"Input Mux", "Internal", "Mic Int Bias"},
 246         {"Input Mux", "External", "Mic Ext Bias"},
 247         {"Mic Int Bias", NULL, "MICIN"},
 248         {"Mic Ext Bias", NULL, "MICEXT"},
 249         {"MICOUT", NULL, "Input Mux"},
 250
 251         /* line out */
 252         {"LOUT", NULL, "Line Out Enable"},
 253         {"ROUT", NULL, "Line Out Enable"},
 254         {"Line Out Enable", "Switch", "Line Out"},
 255         {"Line Out", NULL, "Stereo Mixer"},
 256
 257         /* mono1 out */
 258         {"MOUT1", NULL, "Mono Out"},
 259         {"Mono Out", NULL, "Mono1 Mixer"},
 260
 261         /* left HP */
 262         {"HPL", NULL, "Left HP Enable"},
 263         {"Left HP Enable", "Switch", "HP L Amp"},
 264         {"HP L Amp", NULL, "Stereo Mixer"},
 265
 266         /* right HP */
 267         {"HPR", NULL, "Right HP Enable"},
 268         {"Right HP Enable", "Switch", "HP R Amp"},
 269         {"HP R Amp", NULL, "Stereo Mixer"},
 270
 271         /* speaker */
 272         {"SPP", NULL, "Speaker Enable"},
 273         {"SPN", NULL, "Speaker Enable"},
 274         {"Speaker Enable", "Switch", "Spk Amp"},
 275         {"Spk Amp", NULL, "MIN"},
 276
 277         /* mono 2 */
 278         {"MOUT2", NULL, "Mono 2 Enable"},
 279         {"Mono 2 Enable", "Switch", "Stereo Mixer"},
 280
 281         /* Aux In */
 282         {"Aux In", NULL, "AUX"},
 283
 284         /* ADC */
 285         {"ADC", NULL, "Input Mixer"},
 286         {"Input Mixer", "Mic Capture Switch", "Mic"},
 287         {"Input Mixer", "Aux Capture Switch", "Aux In"},
 288 };
 289
 290 static int ak4535_add_widgets(struct snd_soc_codec *codec)
 291 {
 292         struct snd_soc_dapm_context *dapm = &codec->dapm;
 293
 294         snd_soc_dapm_new_controls(dapm, ak4535_dapm_widgets,
 295                                   ARRAY_SIZE(ak4535_dapm_widgets));
 296         snd_soc_dapm_add_routes(dapm, audio_map, ARRAY_SIZE(audio_map));
 297
 298         return 0;
 299 }
 300
 301 static int ak4535_set_dai_sysclk(struct snd_soc_dai *codec_dai,
 302         int clk_id, unsigned int freq, int dir)
 303 {
 304         struct snd_soc_codec *codec = codec_dai->codec;
 305         struct ak4535_priv *ak4535 = snd_soc_codec_get_drvdata(codec);
 306
 307         ak4535->sysclk = freq;
 308         return 0;
 309 }
 310
 311 static int ak4535_hw_params(struct snd_pcm_substream *substream,
 312                             struct snd_pcm_hw_params *params,
 313                             struct snd_soc_dai *dai)
 314 {
 315         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 316         struct snd_soc_codec *codec = rtd->codec;
 317         struct ak4535_priv *ak4535 = snd_soc_codec_get_drvdata(codec);
 318         u8 mode2 = ak4535_read_reg_cache(codec, AK4535_MODE2) & ~(0x3 << 5);
 319         int rate = params_rate(params), fs = 256;
 320
 321         if (rate)
 322                 fs = ak4535->sysclk / rate;
 323
 324         /* set fs */
 325         switch (fs) {
 326         case 1024:
 327                 mode2 |= (0x2 << 5);
 328                 break;
 329         case 512:
 330                 mode2 |= (0x1 << 5);
 331                 break;
 332         case 256:
 333                 break;
 334         }
 335
 336         /* set rate */
 337         ak4535_write(codec, AK4535_MODE2, mode2);
 338         return 0;
 339 }
 340
 341 static int ak4535_set_dai_fmt(struct snd_soc_dai *codec_dai,
 342                 unsigned int fmt)
 343 {
 344         struct snd_soc_codec *codec = codec_dai->codec;
 345         u8 mode1 = 0;
 346
 347         /* interface format */
 348         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 349         case SND_SOC_DAIFMT_I2S:
 350                 mode1 = 0x0002;
 351                 break;
 352         case SND_SOC_DAIFMT_LEFT_J:
 353                 mode1 = 0x0001;
 354                 break;
 355         default:
 356                 return -EINVAL;
 357         }
 358
 359         /* use 32 fs for BCLK to save power */
 360         mode1 |= 0x4;
 361
 362         ak4535_write(codec, AK4535_MODE1, mode1);
 363         return 0;
 364 }
 365
 366 static int ak4535_mute(struct snd_soc_dai *dai, int mute)
 367 {
 368         struct snd_soc_codec *codec = dai->codec;
 369         u16 mute_reg = ak4535_read_reg_cache(codec, AK4535_DAC);
 370         if (!mute)
 371                 ak4535_write(codec, AK4535_DAC, mute_reg & ~0x20);
 372         else
 373                 ak4535_write(codec, AK4535_DAC, mute_reg | 0x20);
 374         return 0;
 375 }
 376
 377 static int ak4535_set_bias_level(struct snd_soc_codec *codec,
 378         enum snd_soc_bias_level level)
 379 {
 380         u16 i, mute_reg;
 381
 382         switch (level) {
 383         case SND_SOC_BIAS_ON:
 384                 mute_reg = ak4535_read_reg_cache(codec, AK4535_DAC);
 385                 ak4535_write(codec, AK4535_DAC, mute_reg & ~0x20);
 386                 break;
 387         case SND_SOC_BIAS_PREPARE:
 388                 mute_reg = ak4535_read_reg_cache(codec, AK4535_DAC);
 389                 ak4535_write(codec, AK4535_DAC, mute_reg | 0x20);
 390                 break;
 391         case SND_SOC_BIAS_STANDBY:
 392                 i = ak4535_read_reg_cache(codec, AK4535_PM1);
 393                 ak4535_write(codec, AK4535_PM1, i | 0x80);
 394                 i = ak4535_read_reg_cache(codec, AK4535_PM2);
 395                 ak4535_write(codec, AK4535_PM2, i & (~0x80));
 396                 break;
 397         case SND_SOC_BIAS_OFF:
 398                 i = ak4535_read_reg_cache(codec, AK4535_PM1);
 399                 ak4535_write(codec, AK4535_PM1, i & (~0x80));
 400                 break;
 401         }
 402         codec->dapm.bias_level = level;
 403         return 0;
 404 }
 405
 406 #define AK4535_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
 407                 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 |\
 408                 SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000)
 409
 410 static struct snd_soc_dai_ops ak4535_dai_ops = {
 411         .hw_params      = ak4535_hw_params,
 412         .set_fmt        = ak4535_set_dai_fmt,
 413         .digital_mute   = ak4535_mute,
 414         .set_sysclk     = ak4535_set_dai_sysclk,
 415 };
 416
 417 static struct snd_soc_dai_driver ak4535_dai = {
 418         .name = "ak4535-hifi",
 419         .playback = {
 420                 .stream_name = "Playback",
 421                 .channels_min = 1,
 422                 .channels_max = 2,
 423                 .rates = AK4535_RATES,
 424                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
 425         .capture = {
 426                 .stream_name = "Capture",
 427                 .channels_min = 1,
 428                 .channels_max = 2,
 429                 .rates = AK4535_RATES,
 430                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
 431         .ops = &ak4535_dai_ops,
 432 };
 433
 434 static int ak4535_suspend(struct snd_soc_codec *codec, pm_message_t state)
 435 {
 436         ak4535_set_bias_level(codec, SND_SOC_BIAS_OFF);
 437         return 0;
 438 }
 439
 440 static int ak4535_resume(struct snd_soc_codec *codec)
 441 {
 442         ak4535_sync(codec);
 443         ak4535_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 444         return 0;
 445 }
 446
 447 static int ak4535_probe(struct snd_soc_codec *codec)
 448 {
 449         struct ak4535_priv *ak4535 = snd_soc_codec_get_drvdata(codec);
 450
 451         printk(KERN_INFO "AK4535 Audio Codec %s", AK4535_VERSION);
 452
 453         codec->control_data = ak4535->control_data;
 454
 455         /* power on device */
 456         ak4535_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 457
 458         snd_soc_add_controls(codec, ak4535_snd_controls,
 459                                 ARRAY_SIZE(ak4535_snd_controls));
 460         ak4535_add_widgets(codec);
 461
 462         return 0;
 463 }
 464
 465 /* power down chip */
 466 static int ak4535_remove(struct snd_soc_codec *codec)
 467 {
 468         ak4535_set_bias_level(codec, SND_SOC_BIAS_OFF);
 469         return 0;
 470 }
 471
 472 static struct snd_soc_codec_driver soc_codec_dev_ak4535 = {
 473         .probe =        ak4535_probe,
 474         .remove =       ak4535_remove,
 475         .suspend =      ak4535_suspend,
 476         .resume =       ak4535_resume,
 477         .read = ak4535_read_reg_cache,
 478         .write = ak4535_write,
 479         .set_bias_level = ak4535_set_bias_level,
 480         .reg_cache_size = ARRAY_SIZE(ak4535_reg),
 481         .reg_word_size = sizeof(u8),
 482         .reg_cache_default = ak4535_reg,
 483 };
 484
 485 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 486 static __devinit int ak4535_i2c_probe(struct i2c_client *i2c,
 487                                       const struct i2c_device_id *id)
 488 {
 489         struct ak4535_priv *ak4535;
 490         int ret;
 491
 492         ak4535 = kzalloc(sizeof(struct ak4535_priv), GFP_KERNEL);
 493         if (ak4535 == NULL)
 494                 return -ENOMEM;
 495
 496         i2c_set_clientdata(i2c, ak4535);
 497         ak4535->control_data = i2c;
 498         ak4535->control_type = SND_SOC_I2C;
 499
 500         ret = snd_soc_register_codec(&i2c->dev,
 501                         &soc_codec_dev_ak4535, &ak4535_dai, 1);
 502         if (ret < 0)
 503                 kfree(ak4535);
 504         return ret;
 505 }
 506
 507 static __devexit int ak4535_i2c_remove(struct i2c_client *client)
 508 {
 509         snd_soc_unregister_codec(&client->dev);
 510         kfree(i2c_get_clientdata(client));
 511         return 0;
 512 }
 513
 514 static const struct i2c_device_id ak4535_i2c_id[] = {
 515         { "ak4535", 0 },
 516         { }
 517 };
 518 MODULE_DEVICE_TABLE(i2c, ak4535_i2c_id);
 519
 520 static struct i2c_driver ak4535_i2c_driver = {
 521         .driver = {
 522                 .name = "ak4535-codec",
 523                 .owner = THIS_MODULE,
 524         },
 525         .probe =    ak4535_i2c_probe,
 526         .remove =   __devexit_p(ak4535_i2c_remove),
 527         .id_table = ak4535_i2c_id,
 528 };
 529 #endif
 530
 531 static int __init ak4535_modinit(void)
 532 {
 533         int ret = 0;
 534 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 535         ret = i2c_add_driver(&ak4535_i2c_driver);
 536         if (ret != 0) {
 537                 printk(KERN_ERR "Failed to register AK4535 I2C driver: %d\n",
 538                        ret);
 539         }
 540 #endif
 541         return ret;
 542 }
 543 module_init(ak4535_modinit);
 544
 545 static void __exit ak4535_exit(void)
 546 {
 547 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 548         i2c_del_driver(&ak4535_i2c_driver);
 549 #endif
 550 }
 551 module_exit(ak4535_exit);
 552
 553 MODULE_DESCRIPTION("Soc AK4535 driver");
 554 MODULE_AUTHOR("Richard Purdie");
 555 MODULE_LICENSE("GPL");