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 bus_type;
  27         void *control_data;
  28         int sysclk;
  29 };
  30
  31 /* ad193x register cache & default register settings */
  32 static const u8 ad193x_reg[AD193X_NUM_REGS] = {
  33         0, 0, 0, 0, 0, 0, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0, 0, 0,
  34 };
  35
  36 /*
  37  * AD193X volume/mute/de-emphasis etc. controls
  38  */
  39 static const char *ad193x_deemp[] = {"None", "48kHz", "44.1kHz", "32kHz"};
  40
  41 static const struct soc_enum ad193x_deemp_enum =
  42         SOC_ENUM_SINGLE(AD193X_DAC_CTRL2, 1, 4, ad193x_deemp);
  43
  44 static const struct snd_kcontrol_new ad193x_snd_controls[] = {
  45         /* DAC volume control */
  46         SOC_DOUBLE_R("DAC1 Volume", AD193X_DAC_L1_VOL,
  47                         AD193X_DAC_R1_VOL, 0, 0xFF, 1),
  48         SOC_DOUBLE_R("DAC2 Volume", AD193X_DAC_L2_VOL,
  49                         AD193X_DAC_R2_VOL, 0, 0xFF, 1),
  50         SOC_DOUBLE_R("DAC3 Volume", AD193X_DAC_L3_VOL,
  51                         AD193X_DAC_R3_VOL, 0, 0xFF, 1),
  52         SOC_DOUBLE_R("DAC4 Volume", AD193X_DAC_L4_VOL,
  53                         AD193X_DAC_R4_VOL, 0, 0xFF, 1),
  54
  55         /* ADC switch control */
  56         SOC_DOUBLE("ADC1 Switch", AD193X_ADC_CTRL0, AD193X_ADCL1_MUTE,
  57                 AD193X_ADCR1_MUTE, 1, 1),
  58         SOC_DOUBLE("ADC2 Switch", AD193X_ADC_CTRL0, AD193X_ADCL2_MUTE,
  59                 AD193X_ADCR2_MUTE, 1, 1),
  60
  61         /* DAC switch control */
  62         SOC_DOUBLE("DAC1 Switch", AD193X_DAC_CHNL_MUTE, AD193X_DACL1_MUTE,
  63                 AD193X_DACR1_MUTE, 1, 1),
  64         SOC_DOUBLE("DAC2 Switch", AD193X_DAC_CHNL_MUTE, AD193X_DACL2_MUTE,
  65                 AD193X_DACR2_MUTE, 1, 1),
  66         SOC_DOUBLE("DAC3 Switch", AD193X_DAC_CHNL_MUTE, AD193X_DACL3_MUTE,
  67                 AD193X_DACR3_MUTE, 1, 1),
  68         SOC_DOUBLE("DAC4 Switch", AD193X_DAC_CHNL_MUTE, AD193X_DACL4_MUTE,
  69                 AD193X_DACR4_MUTE, 1, 1),
  70
  71         /* ADC high-pass filter */
  72         SOC_SINGLE("ADC High Pass Filter Switch", AD193X_ADC_CTRL0,
  73                         AD193X_ADC_HIGHPASS_FILTER, 1, 0),
  74
  75         /* DAC de-emphasis */
  76         SOC_ENUM("Playback Deemphasis", ad193x_deemp_enum),
  77 };
  78
  79 static const struct snd_soc_dapm_widget ad193x_dapm_widgets[] = {
  80         SND_SOC_DAPM_DAC("DAC", "Playback", AD193X_DAC_CTRL0, 0, 1),
  81         SND_SOC_DAPM_ADC("ADC", "Capture", SND_SOC_NOPM, 0, 0),
  82         SND_SOC_DAPM_SUPPLY("PLL_PWR", AD193X_PLL_CLK_CTRL0, 0, 1, NULL, 0),
  83         SND_SOC_DAPM_SUPPLY("ADC_PWR", AD193X_ADC_CTRL0, 0, 1, NULL, 0),
  84         SND_SOC_DAPM_OUTPUT("DAC1OUT"),
  85         SND_SOC_DAPM_OUTPUT("DAC2OUT"),
  86         SND_SOC_DAPM_OUTPUT("DAC3OUT"),
  87         SND_SOC_DAPM_OUTPUT("DAC4OUT"),
  88         SND_SOC_DAPM_INPUT("ADC1IN"),
  89         SND_SOC_DAPM_INPUT("ADC2IN"),
  90 };
  91
  92 static const struct snd_soc_dapm_route audio_paths[] = {
  93         { "DAC", NULL, "PLL_PWR" },
  94         { "ADC", NULL, "PLL_PWR" },
  95         { "DAC", NULL, "ADC_PWR" },
  96         { "ADC", NULL, "ADC_PWR" },
  97         { "DAC1OUT", "DAC1 Switch", "DAC" },
  98         { "DAC2OUT", "DAC2 Switch", "DAC" },
  99         { "DAC3OUT", "DAC3 Switch", "DAC" },
 100         { "DAC4OUT", "DAC4 Switch", "DAC" },
 101         { "ADC", "ADC1 Switch", "ADC1IN" },
 102         { "ADC", "ADC2 Switch", "ADC2IN" },
 103 };
 104
 105 /*
 106  * DAI ops entries
 107  */
 108
 109 static int ad193x_mute(struct snd_soc_dai *dai, int mute)
 110 {
 111         struct snd_soc_codec *codec = dai->codec;
 112         int reg;
 113
 114         reg = snd_soc_read(codec, AD193X_DAC_CTRL2);
 115         reg = (mute > 0) ? reg | AD193X_DAC_MASTER_MUTE : reg &
 116                 (~AD193X_DAC_MASTER_MUTE);
 117         snd_soc_write(codec, AD193X_DAC_CTRL2, reg);
 118
 119         return 0;
 120 }
 121
 122 static int ad193x_set_tdm_slot(struct snd_soc_dai *dai, unsigned int tx_mask,
 123                                unsigned int rx_mask, int slots, int width)
 124 {
 125         struct snd_soc_codec *codec = dai->codec;
 126         int dac_reg = snd_soc_read(codec, AD193X_DAC_CTRL1);
 127         int adc_reg = snd_soc_read(codec, AD193X_ADC_CTRL2);
 128
 129         dac_reg &= ~AD193X_DAC_CHAN_MASK;
 130         adc_reg &= ~AD193X_ADC_CHAN_MASK;
 131
 132         switch (slots) {
 133         case 2:
 134                 dac_reg |= AD193X_DAC_2_CHANNELS << AD193X_DAC_CHAN_SHFT;
 135                 adc_reg |= AD193X_ADC_2_CHANNELS << AD193X_ADC_CHAN_SHFT;
 136                 break;
 137         case 4:
 138                 dac_reg |= AD193X_DAC_4_CHANNELS << AD193X_DAC_CHAN_SHFT;
 139                 adc_reg |= AD193X_ADC_4_CHANNELS << AD193X_ADC_CHAN_SHFT;
 140                 break;
 141         case 8:
 142                 dac_reg |= AD193X_DAC_8_CHANNELS << AD193X_DAC_CHAN_SHFT;
 143                 adc_reg |= AD193X_ADC_8_CHANNELS << AD193X_ADC_CHAN_SHFT;
 144                 break;
 145         case 16:
 146                 dac_reg |= AD193X_DAC_16_CHANNELS << AD193X_DAC_CHAN_SHFT;
 147                 adc_reg |= AD193X_ADC_16_CHANNELS << AD193X_ADC_CHAN_SHFT;
 148                 break;
 149         default:
 150                 return -EINVAL;
 151         }
 152
 153         snd_soc_write(codec, AD193X_DAC_CTRL1, dac_reg);
 154         snd_soc_write(codec, AD193X_ADC_CTRL2, adc_reg);
 155
 156         return 0;
 157 }
 158
 159 static int ad193x_set_dai_fmt(struct snd_soc_dai *codec_dai,
 160                 unsigned int fmt)
 161 {
 162         struct snd_soc_codec *codec = codec_dai->codec;
 163         int adc_reg1, adc_reg2, dac_reg;
 164
 165         adc_reg1 = snd_soc_read(codec, AD193X_ADC_CTRL1);
 166         adc_reg2 = snd_soc_read(codec, AD193X_ADC_CTRL2);
 167         dac_reg = snd_soc_read(codec, AD193X_DAC_CTRL1);
 168
 169         /* At present, the driver only support AUX ADC mode(SND_SOC_DAIFMT_I2S
 170          * with TDM) and ADC&DAC TDM mode(SND_SOC_DAIFMT_DSP_A)
 171          */
 172         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 173         case SND_SOC_DAIFMT_I2S:
 174                 adc_reg1 &= ~AD193X_ADC_SERFMT_MASK;
 175                 adc_reg1 |= AD193X_ADC_SERFMT_TDM;
 176                 break;
 177         case SND_SOC_DAIFMT_DSP_A:
 178                 adc_reg1 &= ~AD193X_ADC_SERFMT_MASK;
 179                 adc_reg1 |= AD193X_ADC_SERFMT_AUX;
 180                 break;
 181         default:
 182                 return -EINVAL;
 183         }
 184
 185         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 186         case SND_SOC_DAIFMT_NB_NF: /* normal bit clock + frame */
 187                 adc_reg2 &= ~AD193X_ADC_LEFT_HIGH;
 188                 adc_reg2 &= ~AD193X_ADC_BCLK_INV;
 189                 dac_reg &= ~AD193X_DAC_LEFT_HIGH;
 190                 dac_reg &= ~AD193X_DAC_BCLK_INV;
 191                 break;
 192         case SND_SOC_DAIFMT_NB_IF: /* normal bclk + invert frm */
 193                 adc_reg2 |= AD193X_ADC_LEFT_HIGH;
 194                 adc_reg2 &= ~AD193X_ADC_BCLK_INV;
 195                 dac_reg |= AD193X_DAC_LEFT_HIGH;
 196                 dac_reg &= ~AD193X_DAC_BCLK_INV;
 197                 break;
 198         case SND_SOC_DAIFMT_IB_NF: /* invert bclk + normal frm */
 199                 adc_reg2 &= ~AD193X_ADC_LEFT_HIGH;
 200                 adc_reg2 |= AD193X_ADC_BCLK_INV;
 201                 dac_reg &= ~AD193X_DAC_LEFT_HIGH;
 202                 dac_reg |= AD193X_DAC_BCLK_INV;
 203                 break;
 204
 205         case SND_SOC_DAIFMT_IB_IF: /* invert bclk + frm */
 206                 adc_reg2 |= AD193X_ADC_LEFT_HIGH;
 207                 adc_reg2 |= AD193X_ADC_BCLK_INV;
 208                 dac_reg |= AD193X_DAC_LEFT_HIGH;
 209                 dac_reg |= AD193X_DAC_BCLK_INV;
 210                 break;
 211         default:
 212                 return -EINVAL;
 213         }
 214
 215         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 216         case SND_SOC_DAIFMT_CBM_CFM: /* codec clk & frm master */
 217                 adc_reg2 |= AD193X_ADC_LCR_MASTER;
 218                 adc_reg2 |= AD193X_ADC_BCLK_MASTER;
 219                 dac_reg |= AD193X_DAC_LCR_MASTER;
 220                 dac_reg |= AD193X_DAC_BCLK_MASTER;
 221                 break;
 222         case SND_SOC_DAIFMT_CBS_CFM: /* codec clk slave & frm master */
 223                 adc_reg2 |= AD193X_ADC_LCR_MASTER;
 224                 adc_reg2 &= ~AD193X_ADC_BCLK_MASTER;
 225                 dac_reg |= AD193X_DAC_LCR_MASTER;
 226                 dac_reg &= ~AD193X_DAC_BCLK_MASTER;
 227                 break;
 228         case SND_SOC_DAIFMT_CBM_CFS: /* codec clk master & frame slave */
 229                 adc_reg2 &= ~AD193X_ADC_LCR_MASTER;
 230                 adc_reg2 |= AD193X_ADC_BCLK_MASTER;
 231                 dac_reg &= ~AD193X_DAC_LCR_MASTER;
 232                 dac_reg |= AD193X_DAC_BCLK_MASTER;
 233                 break;
 234         case SND_SOC_DAIFMT_CBS_CFS: /* codec clk & frm slave */
 235                 adc_reg2 &= ~AD193X_ADC_LCR_MASTER;
 236                 adc_reg2 &= ~AD193X_ADC_BCLK_MASTER;
 237                 dac_reg &= ~AD193X_DAC_LCR_MASTER;
 238                 dac_reg &= ~AD193X_DAC_BCLK_MASTER;
 239                 break;
 240         default:
 241                 return -EINVAL;
 242         }
 243
 244         snd_soc_write(codec, AD193X_ADC_CTRL1, adc_reg1);
 245         snd_soc_write(codec, AD193X_ADC_CTRL2, adc_reg2);
 246         snd_soc_write(codec, AD193X_DAC_CTRL1, dac_reg);
 247
 248         return 0;
 249 }
 250
 251 static int ad193x_set_dai_sysclk(struct snd_soc_dai *codec_dai,
 252                 int clk_id, unsigned int freq, int dir)
 253 {
 254         struct snd_soc_codec *codec = codec_dai->codec;
 255         struct ad193x_priv *ad193x = snd_soc_codec_get_drvdata(codec);
 256         switch (freq) {
 257         case 12288000:
 258         case 18432000:
 259         case 24576000:
 260         case 36864000:
 261                 ad193x->sysclk = freq;
 262                 return 0;
 263         }
 264         return -EINVAL;
 265 }
 266
 267 static int ad193x_hw_params(struct snd_pcm_substream *substream,
 268                 struct snd_pcm_hw_params *params,
 269                 struct snd_soc_dai *dai)
 270 {
 271         int word_len = 0, reg = 0, master_rate = 0;
 272
 273         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 274         struct snd_soc_codec *codec = rtd->codec;
 275         struct ad193x_priv *ad193x = snd_soc_codec_get_drvdata(codec);
 276
 277         /* bit size */
 278         switch (params_format(params)) {
 279         case SNDRV_PCM_FORMAT_S16_LE:
 280                 word_len = 3;
 281                 break;
 282         case SNDRV_PCM_FORMAT_S20_3LE:
 283                 word_len = 1;
 284                 break;
 285         case SNDRV_PCM_FORMAT_S24_LE:
 286         case SNDRV_PCM_FORMAT_S32_LE:
 287                 word_len = 0;
 288                 break;
 289         }
 290
 291         switch (ad193x->sysclk) {
 292         case 12288000:
 293                 master_rate = AD193X_PLL_INPUT_256;
 294                 break;
 295         case 18432000:
 296                 master_rate = AD193X_PLL_INPUT_384;
 297                 break;
 298         case 24576000:
 299                 master_rate = AD193X_PLL_INPUT_512;
 300                 break;
 301         case 36864000:
 302                 master_rate = AD193X_PLL_INPUT_768;
 303                 break;
 304         }
 305
 306         reg = snd_soc_read(codec, AD193X_PLL_CLK_CTRL0);
 307         reg = (reg & AD193X_PLL_INPUT_MASK) | master_rate;
 308         snd_soc_write(codec, AD193X_PLL_CLK_CTRL0, reg);
 309
 310         reg = snd_soc_read(codec, AD193X_DAC_CTRL2);
 311         reg = (reg & (~AD193X_DAC_WORD_LEN_MASK)) | word_len;
 312         snd_soc_write(codec, AD193X_DAC_CTRL2, reg);
 313
 314         reg = snd_soc_read(codec, AD193X_ADC_CTRL1);
 315         reg = (reg & (~AD193X_ADC_WORD_LEN_MASK)) | word_len;
 316         snd_soc_write(codec, AD193X_ADC_CTRL1, reg);
 317
 318         return 0;
 319 }
 320
 321 static struct snd_soc_dai_ops ad193x_dai_ops = {
 322         .hw_params = ad193x_hw_params,
 323         .digital_mute = ad193x_mute,
 324         .set_tdm_slot = ad193x_set_tdm_slot,
 325         .set_sysclk     = ad193x_set_dai_sysclk,
 326         .set_fmt = ad193x_set_dai_fmt,
 327 };
 328
 329 /* codec DAI instance */
 330 static struct snd_soc_dai_driver ad193x_dai = {
 331         .name = "ad193x-hifi",
 332         .playback = {
 333                 .stream_name = "Playback",
 334                 .channels_min = 2,
 335                 .channels_max = 8,
 336                 .rates = SNDRV_PCM_RATE_48000,
 337                 .formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE |
 338                         SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S24_LE,
 339         },
 340         .capture = {
 341                 .stream_name = "Capture",
 342                 .channels_min = 2,
 343                 .channels_max = 4,
 344                 .rates = SNDRV_PCM_RATE_48000,
 345                 .formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE |
 346                         SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S24_LE,
 347         },
 348         .ops = &ad193x_dai_ops,
 349 };
 350
 351 static int ad193x_probe(struct snd_soc_codec *codec)
 352 {
 353         struct ad193x_priv *ad193x = snd_soc_codec_get_drvdata(codec);
 354         struct snd_soc_dapm_context *dapm = &codec->dapm;
 355         int ret;
 356
 357         codec->control_data = ad193x->control_data;
 358         if (ad193x->bus_type == SND_SOC_I2C)
 359                 ret = snd_soc_codec_set_cache_io(codec, 8, 8, ad193x->bus_type);
 360         else
 361                 ret = snd_soc_codec_set_cache_io(codec, 16, 8, ad193x->bus_type);
 362         if (ret < 0) {
 363                 dev_err(codec->dev, "failed to set cache I/O: %d\n",
 364                                 ret);
 365                 return ret;
 366         }
 367
 368         /* default setting for ad193x */
 369
 370         /* unmute dac channels */
 371         snd_soc_write(codec, AD193X_DAC_CHNL_MUTE, 0x0);
 372         /* de-emphasis: 48kHz, powedown dac */
 373         snd_soc_write(codec, AD193X_DAC_CTRL2, 0x1A);
 374         /* powerdown dac, dac in tdm mode */
 375         snd_soc_write(codec, AD193X_DAC_CTRL0, 0x41);
 376         /* high-pass filter enable */
 377         snd_soc_write(codec, AD193X_ADC_CTRL0, 0x3);
 378         /* sata delay=1, adc aux mode */
 379         snd_soc_write(codec, AD193X_ADC_CTRL1, 0x43);
 380         /* pll input: mclki/xi */
 381         snd_soc_write(codec, AD193X_PLL_CLK_CTRL0, 0x99); /* mclk=24.576Mhz: 0x9D; mclk=12.288Mhz: 0x99 */
 382         snd_soc_write(codec, AD193X_PLL_CLK_CTRL1, 0x04);
 383
 384         snd_soc_add_controls(codec, ad193x_snd_controls,
 385                              ARRAY_SIZE(ad193x_snd_controls));
 386         snd_soc_dapm_new_controls(dapm, ad193x_dapm_widgets,
 387                                   ARRAY_SIZE(ad193x_dapm_widgets));
 388         snd_soc_dapm_add_routes(dapm, audio_paths, ARRAY_SIZE(audio_paths));
 389
 390         return ret;
 391 }
 392
 393 static struct snd_soc_codec_driver soc_codec_dev_ad193x = {
 394         .probe =        ad193x_probe,
 395         .reg_cache_default = ad193x_reg,
 396         .reg_cache_size = AD193X_NUM_REGS,
 397         .reg_word_size = sizeof(u16),
 398 };
 399
 400 #if defined(CONFIG_SPI_MASTER)
 401 static int __devinit ad193x_spi_probe(struct spi_device *spi)
 402 {
 403         struct ad193x_priv *ad193x;
 404         int ret;
 405
 406         ad193x = kzalloc(sizeof(struct ad193x_priv), GFP_KERNEL);
 407         if (ad193x == NULL)
 408                 return -ENOMEM;
 409
 410         spi_set_drvdata(spi, ad193x);
 411         ad193x->control_data = spi;
 412         ad193x->bus_type = SND_SOC_SPI;
 413
 414         ret = snd_soc_register_codec(&spi->dev,
 415                         &soc_codec_dev_ad193x, &ad193x_dai, 1);
 416         if (ret < 0)
 417                 kfree(ad193x);
 418         return ret;
 419 }
 420
 421 static int __devexit ad193x_spi_remove(struct spi_device *spi)
 422 {
 423         snd_soc_unregister_codec(&spi->dev);
 424         kfree(spi_get_drvdata(spi));
 425         return 0;
 426 }
 427
 428 static struct spi_driver ad193x_spi_driver = {
 429         .driver = {
 430                 .name   = "ad193x-codec",
 431                 .owner  = THIS_MODULE,
 432         },
 433         .probe          = ad193x_spi_probe,
 434         .remove         = __devexit_p(ad193x_spi_remove),
 435 };
 436 #endif
 437
 438 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 439 static const struct i2c_device_id ad193x_id[] = {
 440         { "ad1936", 0 },
 441         { "ad1937", 0 },
 442         { }
 443 };
 444 MODULE_DEVICE_TABLE(i2c, ad193x_id);
 445
 446 static int __devinit ad193x_i2c_probe(struct i2c_client *client,
 447                 const struct i2c_device_id *id)
 448 {
 449         struct ad193x_priv *ad193x;
 450         int ret;
 451
 452         ad193x = kzalloc(sizeof(struct ad193x_priv), GFP_KERNEL);
 453         if (ad193x == NULL)
 454                 return -ENOMEM;
 455
 456         i2c_set_clientdata(client, ad193x);
 457         ad193x->control_data = client;
 458         ad193x->bus_type = SND_SOC_I2C;
 459
 460         ret =  snd_soc_register_codec(&client->dev,
 461                         &soc_codec_dev_ad193x, &ad193x_dai, 1);
 462         if (ret < 0)
 463                 kfree(ad193x);
 464         return ret;
 465 }
 466
 467 static int __devexit ad193x_i2c_remove(struct i2c_client *client)
 468 {
 469         snd_soc_unregister_codec(&client->dev);
 470         kfree(i2c_get_clientdata(client));
 471         return 0;
 472 }
 473
 474 static struct i2c_driver ad193x_i2c_driver = {
 475         .driver = {
 476                 .name = "ad193x-codec",
 477         },
 478         .probe    = ad193x_i2c_probe,
 479         .remove   = __devexit_p(ad193x_i2c_remove),
 480         .id_table = ad193x_id,
 481 };
 482 #endif
 483
 484 static int __init ad193x_modinit(void)
 485 {
 486         int ret;
 487
 488 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 489         ret =  i2c_add_driver(&ad193x_i2c_driver);
 490         if (ret != 0) {
 491                 printk(KERN_ERR "Failed to register AD193X I2C driver: %d\n",
 492                                 ret);
 493         }
 494 #endif
 495
 496 #if defined(CONFIG_SPI_MASTER)
 497         ret = spi_register_driver(&ad193x_spi_driver);
 498         if (ret != 0) {
 499                 printk(KERN_ERR "Failed to register AD193X SPI driver: %d\n",
 500                                 ret);
 501         }
 502 #endif
 503         return ret;
 504 }
 505 module_init(ad193x_modinit);
 506
 507 static void __exit ad193x_modexit(void)
 508 {
 509 #if defined(CONFIG_SPI_MASTER)
 510         spi_unregister_driver(&ad193x_spi_driver);
 511 #endif
 512
 513 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 514         i2c_del_driver(&ad193x_i2c_driver);
 515 #endif
 516 }
 517 module_exit(ad193x_modexit);
 518
 519 MODULE_DESCRIPTION("ASoC ad193x driver");
 520 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
 521 MODULE_LICENSE("GPL");