sound/soc/codecs/ad193x.c

   1 /*
   2  * AD193X Audio Codec driver supporting AD1936/7/8/9
   3  *
   4  * Copyright 2010 Analog Devices Inc.
   5  *
   6  * Licensed under the GPL-2 or later.
   7  */
   8
   9 #include <linux/init.h>
  10 #include <linux/module.h>
  11 #include <linux/kernel.h>
  12 #include <linux/device.h>
  13 #include <linux/i2c.h>
  14 #include <linux/spi/spi.h>
  15 #include <linux/slab.h>
  16 #include <sound/core.h>
  17 #include <sound/pcm.h>
  18 #include <sound/pcm_params.h>
  19 #include <sound/initval.h>
  20 #include <sound/soc.h>
  21 #include <sound/tlv.h>
  22 #include "ad193x.h"
  23
  24 /* codec private data */
  25 struct ad193x_priv {
  26         enum snd_soc_control_type control_type;
  27         int sysclk;
  28 };
  29
  30 /* ad193x register cache & default register settings */
  31 static const u8 ad193x_reg[AD193X_NUM_REGS] = {
  32         0, 0, 0, 0, 0, 0, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0, 0, 0,
  33 };
  34
  35 /*
  36  * AD193X volume/mute/de-emphasis etc. controls
  37  */
  38 static const char *ad193x_deemp[] = {"None", "48kHz", "44.1kHz", "32kHz"};
  39
  40 static const struct soc_enum ad193x_deemp_enum =
  41         SOC_ENUM_SINGLE(AD193X_DAC_CTRL2, 1, 4, ad193x_deemp);
  42
  43 static const struct snd_kcontrol_new ad193x_snd_controls[] = {
  44         /* DAC volume control */
  45         SOC_DOUBLE_R("DAC1 Volume", AD193X_DAC_L1_VOL,
  46                         AD193X_DAC_R1_VOL, 0, 0xFF, 1),
  47         SOC_DOUBLE_R("DAC2 Volume", AD193X_DAC_L2_VOL,
  48                         AD193X_DAC_R2_VOL, 0, 0xFF, 1),
  49         SOC_DOUBLE_R("DAC3 Volume", AD193X_DAC_L3_VOL,
  50                         AD193X_DAC_R3_VOL, 0, 0xFF, 1),
  51         SOC_DOUBLE_R("DAC4 Volume", AD193X_DAC_L4_VOL,
  52                         AD193X_DAC_R4_VOL, 0, 0xFF, 1),
  53
  54         /* ADC switch control */
  55         SOC_DOUBLE("ADC1 Switch", AD193X_ADC_CTRL0, AD193X_ADCL1_MUTE,
  56                 AD193X_ADCR1_MUTE, 1, 1),
  57         SOC_DOUBLE("ADC2 Switch", AD193X_ADC_CTRL0, AD193X_ADCL2_MUTE,
  58                 AD193X_ADCR2_MUTE, 1, 1),
  59
  60         /* DAC switch control */
  61         SOC_DOUBLE("DAC1 Switch", AD193X_DAC_CHNL_MUTE, AD193X_DACL1_MUTE,
  62                 AD193X_DACR1_MUTE, 1, 1),
  63         SOC_DOUBLE("DAC2 Switch", AD193X_DAC_CHNL_MUTE, AD193X_DACL2_MUTE,
  64                 AD193X_DACR2_MUTE, 1, 1),
  65         SOC_DOUBLE("DAC3 Switch", AD193X_DAC_CHNL_MUTE, AD193X_DACL3_MUTE,
  66                 AD193X_DACR3_MUTE, 1, 1),
  67         SOC_DOUBLE("DAC4 Switch", AD193X_DAC_CHNL_MUTE, AD193X_DACL4_MUTE,
  68                 AD193X_DACR4_MUTE, 1, 1),
  69
  70         /* ADC high-pass filter */
  71         SOC_SINGLE("ADC High Pass Filter Switch", AD193X_ADC_CTRL0,
  72                         AD193X_ADC_HIGHPASS_FILTER, 1, 0),
  73
  74         /* DAC de-emphasis */
  75         SOC_ENUM("Playback Deemphasis", ad193x_deemp_enum),
  76 };
  77
  78 static const struct snd_soc_dapm_widget ad193x_dapm_widgets[] = {
  79         SND_SOC_DAPM_DAC("DAC", "Playback", AD193X_DAC_CTRL0, 0, 1),
  80         SND_SOC_DAPM_ADC("ADC", "Capture", SND_SOC_NOPM, 0, 0),
  81         SND_SOC_DAPM_SUPPLY("PLL_PWR", AD193X_PLL_CLK_CTRL0, 0, 1, NULL, 0),
  82         SND_SOC_DAPM_SUPPLY("ADC_PWR", AD193X_ADC_CTRL0, 0, 1, NULL, 0),
  83         SND_SOC_DAPM_OUTPUT("DAC1OUT"),
  84         SND_SOC_DAPM_OUTPUT("DAC2OUT"),
  85         SND_SOC_DAPM_OUTPUT("DAC3OUT"),
  86         SND_SOC_DAPM_OUTPUT("DAC4OUT"),
  87         SND_SOC_DAPM_INPUT("ADC1IN"),
  88         SND_SOC_DAPM_INPUT("ADC2IN"),
  89 };
  90
  91 static const struct snd_soc_dapm_route audio_paths[] = {
  92         { "DAC", NULL, "PLL_PWR" },
  93         { "ADC", NULL, "PLL_PWR" },
  94         { "DAC", NULL, "ADC_PWR" },
  95         { "ADC", NULL, "ADC_PWR" },
  96         { "DAC1OUT", "DAC1 Switch", "DAC" },
  97         { "DAC2OUT", "DAC2 Switch", "DAC" },
  98         { "DAC3OUT", "DAC3 Switch", "DAC" },
  99         { "DAC4OUT", "DAC4 Switch", "DAC" },
 100         { "ADC", "ADC1 Switch", "ADC1IN" },
 101         { "ADC", "ADC2 Switch", "ADC2IN" },
 102 };
 103
 104 /*
 105  * DAI ops entries
 106  */
 107
 108 static int ad193x_mute(struct snd_soc_dai *dai, int mute)
 109 {
 110         struct snd_soc_codec *codec = dai->codec;
 111         int reg;
 112
 113         reg = snd_soc_read(codec, AD193X_DAC_CTRL2);
 114         reg = (mute > 0) ? reg | AD193X_DAC_MASTER_MUTE : reg &
 115                 (~AD193X_DAC_MASTER_MUTE);
 116         snd_soc_write(codec, AD193X_DAC_CTRL2, reg);
 117
 118         return 0;
 119 }
 120
 121 static int ad193x_set_tdm_slot(struct snd_soc_dai *dai, unsigned int tx_mask,
 122                                unsigned int rx_mask, int slots, int width)
 123 {
 124         struct snd_soc_codec *codec = dai->codec;
 125         int dac_reg = snd_soc_read(codec, AD193X_DAC_CTRL1);
 126         int adc_reg = snd_soc_read(codec, AD193X_ADC_CTRL2);
 127
 128         dac_reg &= ~AD193X_DAC_CHAN_MASK;
 129         adc_reg &= ~AD193X_ADC_CHAN_MASK;
 130
 131         switch (slots) {
 132         case 2:
 133                 dac_reg |= AD193X_DAC_2_CHANNELS << AD193X_DAC_CHAN_SHFT;
 134                 adc_reg |= AD193X_ADC_2_CHANNELS << AD193X_ADC_CHAN_SHFT;
 135                 break;
 136         case 4:
 137                 dac_reg |= AD193X_DAC_4_CHANNELS << AD193X_DAC_CHAN_SHFT;
 138                 adc_reg |= AD193X_ADC_4_CHANNELS << AD193X_ADC_CHAN_SHFT;
 139                 break;
 140         case 8:
 141                 dac_reg |= AD193X_DAC_8_CHANNELS << AD193X_DAC_CHAN_SHFT;
 142                 adc_reg |= AD193X_ADC_8_CHANNELS << AD193X_ADC_CHAN_SHFT;
 143                 break;
 144         case 16:
 145                 dac_reg |= AD193X_DAC_16_CHANNELS << AD193X_DAC_CHAN_SHFT;
 146                 adc_reg |= AD193X_ADC_16_CHANNELS << AD193X_ADC_CHAN_SHFT;
 147                 break;
 148         default:
 149                 return -EINVAL;
 150         }
 151
 152         snd_soc_write(codec, AD193X_DAC_CTRL1, dac_reg);
 153         snd_soc_write(codec, AD193X_ADC_CTRL2, adc_reg);
 154
 155         return 0;
 156 }
 157
 158 static int ad193x_set_dai_fmt(struct snd_soc_dai *codec_dai,
 159                 unsigned int fmt)
 160 {
 161         struct snd_soc_codec *codec = codec_dai->codec;
 162         int adc_reg1, adc_reg2, dac_reg;
 163
 164         adc_reg1 = snd_soc_read(codec, AD193X_ADC_CTRL1);
 165         adc_reg2 = snd_soc_read(codec, AD193X_ADC_CTRL2);
 166         dac_reg = snd_soc_read(codec, AD193X_DAC_CTRL1);
 167
 168         /* At present, the driver only support AUX ADC mode(SND_SOC_DAIFMT_I2S
 169          * with TDM) and ADC&DAC TDM mode(SND_SOC_DAIFMT_DSP_A)
 170          */
 171         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 172         case SND_SOC_DAIFMT_I2S:
 173                 adc_reg1 &= ~AD193X_ADC_SERFMT_MASK;
 174                 adc_reg1 |= AD193X_ADC_SERFMT_TDM;
 175                 break;
 176         case SND_SOC_DAIFMT_DSP_A:
 177                 adc_reg1 &= ~AD193X_ADC_SERFMT_MASK;
 178                 adc_reg1 |= AD193X_ADC_SERFMT_AUX;
 179                 break;
 180         default:
 181                 return -EINVAL;
 182         }
 183
 184         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 185         case SND_SOC_DAIFMT_NB_NF: /* normal bit clock + frame */
 186                 adc_reg2 &= ~AD193X_ADC_LEFT_HIGH;
 187                 adc_reg2 &= ~AD193X_ADC_BCLK_INV;
 188                 dac_reg &= ~AD193X_DAC_LEFT_HIGH;
 189                 dac_reg &= ~AD193X_DAC_BCLK_INV;
 190                 break;
 191         case SND_SOC_DAIFMT_NB_IF: /* normal bclk + invert frm */
 192                 adc_reg2 |= AD193X_ADC_LEFT_HIGH;
 193                 adc_reg2 &= ~AD193X_ADC_BCLK_INV;
 194                 dac_reg |= AD193X_DAC_LEFT_HIGH;
 195                 dac_reg &= ~AD193X_DAC_BCLK_INV;
 196                 break;
 197         case SND_SOC_DAIFMT_IB_NF: /* invert bclk + normal frm */
 198                 adc_reg2 &= ~AD193X_ADC_LEFT_HIGH;
 199                 adc_reg2 |= AD193X_ADC_BCLK_INV;
 200                 dac_reg &= ~AD193X_DAC_LEFT_HIGH;
 201                 dac_reg |= AD193X_DAC_BCLK_INV;
 202                 break;
 203
 204         case SND_SOC_DAIFMT_IB_IF: /* invert bclk + frm */
 205                 adc_reg2 |= AD193X_ADC_LEFT_HIGH;
 206                 adc_reg2 |= AD193X_ADC_BCLK_INV;
 207                 dac_reg |= AD193X_DAC_LEFT_HIGH;
 208                 dac_reg |= AD193X_DAC_BCLK_INV;
 209                 break;
 210         default:
 211                 return -EINVAL;
 212         }
 213
 214         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 215         case SND_SOC_DAIFMT_CBM_CFM: /* codec clk & frm master */
 216                 adc_reg2 |= AD193X_ADC_LCR_MASTER;
 217                 adc_reg2 |= AD193X_ADC_BCLK_MASTER;
 218                 dac_reg |= AD193X_DAC_LCR_MASTER;
 219                 dac_reg |= AD193X_DAC_BCLK_MASTER;
 220                 break;
 221         case SND_SOC_DAIFMT_CBS_CFM: /* codec clk slave & frm master */
 222                 adc_reg2 |= AD193X_ADC_LCR_MASTER;
 223                 adc_reg2 &= ~AD193X_ADC_BCLK_MASTER;
 224                 dac_reg |= AD193X_DAC_LCR_MASTER;
 225                 dac_reg &= ~AD193X_DAC_BCLK_MASTER;
 226                 break;
 227         case SND_SOC_DAIFMT_CBM_CFS: /* codec clk master & frame slave */
 228                 adc_reg2 &= ~AD193X_ADC_LCR_MASTER;
 229                 adc_reg2 |= AD193X_ADC_BCLK_MASTER;
 230                 dac_reg &= ~AD193X_DAC_LCR_MASTER;
 231                 dac_reg |= AD193X_DAC_BCLK_MASTER;
 232                 break;
 233         case SND_SOC_DAIFMT_CBS_CFS: /* codec clk & frm slave */
 234                 adc_reg2 &= ~AD193X_ADC_LCR_MASTER;
 235                 adc_reg2 &= ~AD193X_ADC_BCLK_MASTER;
 236                 dac_reg &= ~AD193X_DAC_LCR_MASTER;
 237                 dac_reg &= ~AD193X_DAC_BCLK_MASTER;
 238                 break;
 239         default:
 240                 return -EINVAL;
 241         }
 242
 243         snd_soc_write(codec, AD193X_ADC_CTRL1, adc_reg1);
 244         snd_soc_write(codec, AD193X_ADC_CTRL2, adc_reg2);
 245         snd_soc_write(codec, AD193X_DAC_CTRL1, dac_reg);
 246
 247         return 0;
 248 }
 249
 250 static int ad193x_set_dai_sysclk(struct snd_soc_dai *codec_dai,
 251                 int clk_id, unsigned int freq, int dir)
 252 {
 253         struct snd_soc_codec *codec = codec_dai->codec;
 254         struct ad193x_priv *ad193x = snd_soc_codec_get_drvdata(codec);
 255         switch (freq) {
 256         case 12288000:
 257         case 18432000:
 258         case 24576000:
 259         case 36864000:
 260                 ad193x->sysclk = freq;
 261                 return 0;
 262         }
 263         return -EINVAL;
 264 }
 265
 266 static int ad193x_hw_params(struct snd_pcm_substream *substream,
 267                 struct snd_pcm_hw_params *params,
 268                 struct snd_soc_dai *dai)
 269 {
 270         int word_len = 0, reg = 0, master_rate = 0;
 271
 272         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 273         struct snd_soc_codec *codec = rtd->codec;
 274         struct ad193x_priv *ad193x = snd_soc_codec_get_drvdata(codec);
 275
 276         /* bit size */
 277         switch (params_format(params)) {
 278         case SNDRV_PCM_FORMAT_S16_LE:
 279                 word_len = 3;
 280                 break;
 281         case SNDRV_PCM_FORMAT_S20_3LE:
 282                 word_len = 1;
 283                 break;
 284         case SNDRV_PCM_FORMAT_S24_LE:
 285         case SNDRV_PCM_FORMAT_S32_LE:
 286                 word_len = 0;
 287                 break;
 288         }
 289
 290         switch (ad193x->sysclk) {
 291         case 12288000:
 292                 master_rate = AD193X_PLL_INPUT_256;
 293                 break;
 294         case 18432000:
 295                 master_rate = AD193X_PLL_INPUT_384;
 296                 break;
 297         case 24576000:
 298                 master_rate = AD193X_PLL_INPUT_512;
 299                 break;
 300         case 36864000:
 301                 master_rate = AD193X_PLL_INPUT_768;
 302                 break;
 303         }
 304
 305         reg = snd_soc_read(codec, AD193X_PLL_CLK_CTRL0);
 306         reg = (reg & AD193X_PLL_INPUT_MASK) | master_rate;
 307         snd_soc_write(codec, AD193X_PLL_CLK_CTRL0, reg);
 308
 309         reg = snd_soc_read(codec, AD193X_DAC_CTRL2);
 310         reg = (reg & (~AD193X_DAC_WORD_LEN_MASK)) | word_len;
 311         snd_soc_write(codec, AD193X_DAC_CTRL2, reg);
 312
 313         reg = snd_soc_read(codec, AD193X_ADC_CTRL1);
 314         reg = (reg & (~AD193X_ADC_WORD_LEN_MASK)) | word_len;
 315         snd_soc_write(codec, AD193X_ADC_CTRL1, reg);
 316
 317         return 0;
 318 }
 319
 320 static struct snd_soc_dai_ops ad193x_dai_ops = {
 321         .hw_params = ad193x_hw_params,
 322         .digital_mute = ad193x_mute,
 323         .set_tdm_slot = ad193x_set_tdm_slot,
 324         .set_sysclk     = ad193x_set_dai_sysclk,
 325         .set_fmt = ad193x_set_dai_fmt,
 326 };
 327
 328 /* codec DAI instance */
 329 static struct snd_soc_dai_driver ad193x_dai = {
 330         .name = "ad193x-hifi",
 331         .playback = {
 332                 .stream_name = "Playback",
 333                 .channels_min = 2,
 334                 .channels_max = 8,
 335                 .rates = SNDRV_PCM_RATE_48000,
 336                 .formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE |
 337                         SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S24_LE,
 338         },
 339         .capture = {
 340                 .stream_name = "Capture",
 341                 .channels_min = 2,
 342                 .channels_max = 4,
 343                 .rates = SNDRV_PCM_RATE_48000,
 344                 .formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE |
 345                         SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S24_LE,
 346         },
 347         .ops = &ad193x_dai_ops,
 348 };
 349
 350 static int ad193x_probe(struct snd_soc_codec *codec)
 351 {
 352         struct ad193x_priv *ad193x = snd_soc_codec_get_drvdata(codec);
 353         struct snd_soc_dapm_context *dapm = &codec->dapm;
 354         int ret;
 355
 356         if (ad193x->control_type == SND_SOC_I2C)
 357                 ret = snd_soc_codec_set_cache_io(codec, 8, 8, ad193x->control_type);
 358         else
 359                 ret = snd_soc_codec_set_cache_io(codec, 16, 8, ad193x->control_type);
 360         if (ret < 0) {
 361                 dev_err(codec->dev, "failed to set cache I/O: %d\n", ret);
 362                 return ret;
 363         }
 364
 365         /* default setting for ad193x */
 366
 367         /* unmute dac channels */
 368         snd_soc_write(codec, AD193X_DAC_CHNL_MUTE, 0x0);
 369         /* de-emphasis: 48kHz, powedown dac */
 370         snd_soc_write(codec, AD193X_DAC_CTRL2, 0x1A);
 371         /* powerdown dac, dac in tdm mode */
 372         snd_soc_write(codec, AD193X_DAC_CTRL0, 0x41);
 373         /* high-pass filter enable */
 374         snd_soc_write(codec, AD193X_ADC_CTRL0, 0x3);
 375         /* sata delay=1, adc aux mode */
 376         snd_soc_write(codec, AD193X_ADC_CTRL1, 0x43);
 377         /* pll input: mclki/xi */
 378         snd_soc_write(codec, AD193X_PLL_CLK_CTRL0, 0x99); /* mclk=24.576Mhz: 0x9D; mclk=12.288Mhz: 0x99 */
 379         snd_soc_write(codec, AD193X_PLL_CLK_CTRL1, 0x04);
 380
 381         snd_soc_add_controls(codec, ad193x_snd_controls,
 382                              ARRAY_SIZE(ad193x_snd_controls));
 383         snd_soc_dapm_new_controls(dapm, ad193x_dapm_widgets,
 384                                   ARRAY_SIZE(ad193x_dapm_widgets));
 385         snd_soc_dapm_add_routes(dapm, audio_paths, ARRAY_SIZE(audio_paths));
 386
 387         return ret;
 388 }
 389
 390 static struct snd_soc_codec_driver soc_codec_dev_ad193x = {
 391         .probe =        ad193x_probe,
 392         .reg_cache_default = ad193x_reg,
 393         .reg_cache_size = AD193X_NUM_REGS,
 394         .reg_word_size = sizeof(u16),
 395 };
 396
 397 #if defined(CONFIG_SPI_MASTER)
 398 static int __devinit ad193x_spi_probe(struct spi_device *spi)
 399 {
 400         struct ad193x_priv *ad193x;
 401         int ret;
 402
 403         ad193x = kzalloc(sizeof(struct ad193x_priv), GFP_KERNEL);
 404         if (ad193x == NULL)
 405                 return -ENOMEM;
 406
 407         spi_set_drvdata(spi, ad193x);
 408         ad193x->control_type = SND_SOC_SPI;
 409
 410         ret = snd_soc_register_codec(&spi->dev,
 411                         &soc_codec_dev_ad193x, &ad193x_dai, 1);
 412         if (ret < 0)
 413                 kfree(ad193x);
 414         return ret;
 415 }
 416
 417 static int __devexit ad193x_spi_remove(struct spi_device *spi)
 418 {
 419         snd_soc_unregister_codec(&spi->dev);
 420         kfree(spi_get_drvdata(spi));
 421         return 0;
 422 }
 423
 424 static struct spi_driver ad193x_spi_driver = {
 425         .driver = {
 426                 .name   = "ad193x",
 427                 .owner  = THIS_MODULE,
 428         },
 429         .probe          = ad193x_spi_probe,
 430         .remove         = __devexit_p(ad193x_spi_remove),
 431 };
 432 #endif
 433
 434 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 435 static const struct i2c_device_id ad193x_id[] = {
 436         { "ad1936", 0 },
 437         { "ad1937", 0 },
 438         { }
 439 };
 440 MODULE_DEVICE_TABLE(i2c, ad193x_id);
 441
 442 static int __devinit ad193x_i2c_probe(struct i2c_client *client,
 443                 const struct i2c_device_id *id)
 444 {
 445         struct ad193x_priv *ad193x;
 446         int ret;
 447
 448         ad193x = kzalloc(sizeof(struct ad193x_priv), GFP_KERNEL);
 449         if (ad193x == NULL)
 450                 return -ENOMEM;
 451
 452         i2c_set_clientdata(client, ad193x);
 453         ad193x->control_type = SND_SOC_I2C;
 454
 455         ret =  snd_soc_register_codec(&client->dev,
 456                         &soc_codec_dev_ad193x, &ad193x_dai, 1);
 457         if (ret < 0)
 458                 kfree(ad193x);
 459         return ret;
 460 }
 461
 462 static int __devexit ad193x_i2c_remove(struct i2c_client *client)
 463 {
 464         snd_soc_unregister_codec(&client->dev);
 465         kfree(i2c_get_clientdata(client));
 466         return 0;
 467 }
 468
 469 static struct i2c_driver ad193x_i2c_driver = {
 470         .driver = {
 471                 .name = "ad193x",
 472         },
 473         .probe    = ad193x_i2c_probe,
 474         .remove   = __devexit_p(ad193x_i2c_remove),
 475         .id_table = ad193x_id,
 476 };
 477 #endif
 478
 479 static int __init ad193x_modinit(void)
 480 {
 481         int ret;
 482
 483 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 484         ret =  i2c_add_driver(&ad193x_i2c_driver);
 485         if (ret != 0) {
 486                 printk(KERN_ERR "Failed to register AD193X I2C driver: %d\n",
 487                                 ret);
 488         }
 489 #endif
 490
 491 #if defined(CONFIG_SPI_MASTER)
 492         ret = spi_register_driver(&ad193x_spi_driver);
 493         if (ret != 0) {
 494                 printk(KERN_ERR "Failed to register AD193X SPI driver: %d\n",
 495                                 ret);
 496         }
 497 #endif
 498         return ret;
 499 }
 500 module_init(ad193x_modinit);
 501
 502 static void __exit ad193x_modexit(void)
 503 {
 504 #if defined(CONFIG_SPI_MASTER)
 505         spi_unregister_driver(&ad193x_spi_driver);
 506 #endif
 507
 508 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 509         i2c_del_driver(&ad193x_i2c_driver);
 510 #endif
 511 }
 512 module_exit(ad193x_modexit);
 513
 514 MODULE_DESCRIPTION("ASoC ad193x driver");
 515 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
 516 MODULE_LICENSE("GPL");