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 ak4535_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_set_dai_sysclk(struct snd_soc_dai *codec_dai,
 291         int clk_id, unsigned int freq, int dir)
 292 {
 293         struct snd_soc_codec *codec = codec_dai->codec;
 294         struct ak4535_priv *ak4535 = snd_soc_codec_get_drvdata(codec);
 295
 296         ak4535->sysclk = freq;
 297         return 0;
 298 }
 299
 300 static int ak4535_hw_params(struct snd_pcm_substream *substream,
 301                             struct snd_pcm_hw_params *params,
 302                             struct snd_soc_dai *dai)
 303 {
 304         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 305         struct snd_soc_codec *codec = rtd->codec;
 306         struct ak4535_priv *ak4535 = snd_soc_codec_get_drvdata(codec);
 307         u8 mode2 = ak4535_read_reg_cache(codec, AK4535_MODE2) & ~(0x3 << 5);
 308         int rate = params_rate(params), fs = 256;
 309
 310         if (rate)
 311                 fs = ak4535->sysclk / rate;
 312
 313         /* set fs */
 314         switch (fs) {
 315         case 1024:
 316                 mode2 |= (0x2 << 5);
 317                 break;
 318         case 512:
 319                 mode2 |= (0x1 << 5);
 320                 break;
 321         case 256:
 322                 break;
 323         }
 324
 325         /* set rate */
 326         ak4535_write(codec, AK4535_MODE2, mode2);
 327         return 0;
 328 }
 329
 330 static int ak4535_set_dai_fmt(struct snd_soc_dai *codec_dai,
 331                 unsigned int fmt)
 332 {
 333         struct snd_soc_codec *codec = codec_dai->codec;
 334         u8 mode1 = 0;
 335
 336         /* interface format */
 337         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 338         case SND_SOC_DAIFMT_I2S:
 339                 mode1 = 0x0002;
 340                 break;
 341         case SND_SOC_DAIFMT_LEFT_J:
 342                 mode1 = 0x0001;
 343                 break;
 344         default:
 345                 return -EINVAL;
 346         }
 347
 348         /* use 32 fs for BCLK to save power */
 349         mode1 |= 0x4;
 350
 351         ak4535_write(codec, AK4535_MODE1, mode1);
 352         return 0;
 353 }
 354
 355 static int ak4535_mute(struct snd_soc_dai *dai, int mute)
 356 {
 357         struct snd_soc_codec *codec = dai->codec;
 358         u16 mute_reg = ak4535_read_reg_cache(codec, AK4535_DAC);
 359         if (!mute)
 360                 ak4535_write(codec, AK4535_DAC, mute_reg & ~0x20);
 361         else
 362                 ak4535_write(codec, AK4535_DAC, mute_reg | 0x20);
 363         return 0;
 364 }
 365
 366 static int ak4535_set_bias_level(struct snd_soc_codec *codec,
 367         enum snd_soc_bias_level level)
 368 {
 369         u16 i, mute_reg;
 370
 371         switch (level) {
 372         case SND_SOC_BIAS_ON:
 373                 mute_reg = ak4535_read_reg_cache(codec, AK4535_DAC);
 374                 ak4535_write(codec, AK4535_DAC, mute_reg & ~0x20);
 375                 break;
 376         case SND_SOC_BIAS_PREPARE:
 377                 mute_reg = ak4535_read_reg_cache(codec, AK4535_DAC);
 378                 ak4535_write(codec, AK4535_DAC, mute_reg | 0x20);
 379                 break;
 380         case SND_SOC_BIAS_STANDBY:
 381                 i = ak4535_read_reg_cache(codec, AK4535_PM1);
 382                 ak4535_write(codec, AK4535_PM1, i | 0x80);
 383                 i = ak4535_read_reg_cache(codec, AK4535_PM2);
 384                 ak4535_write(codec, AK4535_PM2, i & (~0x80));
 385                 break;
 386         case SND_SOC_BIAS_OFF:
 387                 i = ak4535_read_reg_cache(codec, AK4535_PM1);
 388                 ak4535_write(codec, AK4535_PM1, i & (~0x80));
 389                 break;
 390         }
 391         codec->dapm.bias_level = level;
 392         return 0;
 393 }
 394
 395 #define AK4535_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
 396                 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 |\
 397                 SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000)
 398
 399 static struct snd_soc_dai_ops ak4535_dai_ops = {
 400         .hw_params      = ak4535_hw_params,
 401         .set_fmt        = ak4535_set_dai_fmt,
 402         .digital_mute   = ak4535_mute,
 403         .set_sysclk     = ak4535_set_dai_sysclk,
 404 };
 405
 406 static struct snd_soc_dai_driver ak4535_dai = {
 407         .name = "ak4535-hifi",
 408         .playback = {
 409                 .stream_name = "Playback",
 410                 .channels_min = 1,
 411                 .channels_max = 2,
 412                 .rates = AK4535_RATES,
 413                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
 414         .capture = {
 415                 .stream_name = "Capture",
 416                 .channels_min = 1,
 417                 .channels_max = 2,
 418                 .rates = AK4535_RATES,
 419                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
 420         .ops = &ak4535_dai_ops,
 421 };
 422
 423 static int ak4535_suspend(struct snd_soc_codec *codec, pm_message_t state)
 424 {
 425         ak4535_set_bias_level(codec, SND_SOC_BIAS_OFF);
 426         return 0;
 427 }
 428
 429 static int ak4535_resume(struct snd_soc_codec *codec)
 430 {
 431         ak4535_sync(codec);
 432         ak4535_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 433         return 0;
 434 }
 435
 436 static int ak4535_probe(struct snd_soc_codec *codec)
 437 {
 438         struct ak4535_priv *ak4535 = snd_soc_codec_get_drvdata(codec);
 439
 440         printk(KERN_INFO "AK4535 Audio Codec %s", AK4535_VERSION);
 441
 442         codec->control_data = ak4535->control_data;
 443
 444         /* power on device */
 445         ak4535_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 446
 447         snd_soc_add_controls(codec, ak4535_snd_controls,
 448                                 ARRAY_SIZE(ak4535_snd_controls));
 449         return 0;
 450 }
 451
 452 /* power down chip */
 453 static int ak4535_remove(struct snd_soc_codec *codec)
 454 {
 455         ak4535_set_bias_level(codec, SND_SOC_BIAS_OFF);
 456         return 0;
 457 }
 458
 459 static struct snd_soc_codec_driver soc_codec_dev_ak4535 = {
 460         .probe =        ak4535_probe,
 461         .remove =       ak4535_remove,
 462         .suspend =      ak4535_suspend,
 463         .resume =       ak4535_resume,
 464         .read = ak4535_read_reg_cache,
 465         .write = ak4535_write,
 466         .set_bias_level = ak4535_set_bias_level,
 467         .reg_cache_size = ARRAY_SIZE(ak4535_reg),
 468         .reg_word_size = sizeof(u8),
 469         .reg_cache_default = ak4535_reg,
 470         .dapm_widgets = ak4535_dapm_widgets,
 471         .num_dapm_widgets = ARRAY_SIZE(ak4535_dapm_widgets),
 472         .dapm_routes = ak4535_audio_map,
 473         .num_dapm_routes = ARRAY_SIZE(ak4535_audio_map),
 474 };
 475
 476 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 477 static __devinit int ak4535_i2c_probe(struct i2c_client *i2c,
 478                                       const struct i2c_device_id *id)
 479 {
 480         struct ak4535_priv *ak4535;
 481         int ret;
 482
 483         ak4535 = kzalloc(sizeof(struct ak4535_priv), GFP_KERNEL);
 484         if (ak4535 == NULL)
 485                 return -ENOMEM;
 486
 487         i2c_set_clientdata(i2c, ak4535);
 488         ak4535->control_data = i2c;
 489         ak4535->control_type = SND_SOC_I2C;
 490
 491         ret = snd_soc_register_codec(&i2c->dev,
 492                         &soc_codec_dev_ak4535, &ak4535_dai, 1);
 493         if (ret < 0)
 494                 kfree(ak4535);
 495         return ret;
 496 }
 497
 498 static __devexit int ak4535_i2c_remove(struct i2c_client *client)
 499 {
 500         snd_soc_unregister_codec(&client->dev);
 501         kfree(i2c_get_clientdata(client));
 502         return 0;
 503 }
 504
 505 static const struct i2c_device_id ak4535_i2c_id[] = {
 506         { "ak4535", 0 },
 507         { }
 508 };
 509 MODULE_DEVICE_TABLE(i2c, ak4535_i2c_id);
 510
 511 static struct i2c_driver ak4535_i2c_driver = {
 512         .driver = {
 513                 .name = "ak4535-codec",
 514                 .owner = THIS_MODULE,
 515         },
 516         .probe =    ak4535_i2c_probe,
 517         .remove =   __devexit_p(ak4535_i2c_remove),
 518         .id_table = ak4535_i2c_id,
 519 };
 520 #endif
 521
 522 static int __init ak4535_modinit(void)
 523 {
 524         int ret = 0;
 525 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 526         ret = i2c_add_driver(&ak4535_i2c_driver);
 527         if (ret != 0) {
 528                 printk(KERN_ERR "Failed to register AK4535 I2C driver: %d\n",
 529                        ret);
 530         }
 531 #endif
 532         return ret;
 533 }
 534 module_init(ak4535_modinit);
 535
 536 static void __exit ak4535_exit(void)
 537 {
 538 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 539         i2c_del_driver(&ak4535_i2c_driver);
 540 #endif
 541 }
 542 module_exit(ak4535_exit);
 543
 544 MODULE_DESCRIPTION("Soc AK4535 driver");
 545 MODULE_AUTHOR("Richard Purdie");
 546 MODULE_LICENSE("GPL");