sound/soc/codecs/ad1938.c

   1 /*
   2  * File:         sound/soc/codecs/ad1938.c
   3  * Author:       Barry Song <Barry.Song@analog.com>
   4  *
   5  * Created:      June 04 2009
   6  * Description:  Driver for AD1938 sound chip
   7  *
   8  * Modified:
   9  *               Copyright 2009 Analog Devices Inc.
  10  *
  11  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, see the file COPYING, or write
  25  * to the Free Software Foundation, Inc.,
  26  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  27  */
  28
  29 #include <linux/init.h>
  30 #include <linux/module.h>
  31 #include <linux/kernel.h>
  32 #include <linux/device.h>
  33 #include <sound/core.h>
  34 #include <sound/pcm.h>
  35 #include <sound/pcm_params.h>
  36 #include <sound/initval.h>
  37 #include <sound/soc.h>
  38 #include <sound/tlv.h>
  39 #include <sound/soc-dapm.h>
  40 #include <linux/spi/spi.h>
  41 #include "ad1938.h"
  42
  43 /* codec private data */
  44 struct ad1938_priv {
  45         struct snd_soc_codec codec;
  46         u8 reg_cache[AD1938_NUM_REGS];
  47 };
  48
  49 static struct snd_soc_codec *ad1938_codec;
  50 struct snd_soc_codec_device soc_codec_dev_ad1938;
  51 static int ad1938_register(struct ad1938_priv *ad1938);
  52 static void ad1938_unregister(struct ad1938_priv *ad1938);
  53
  54 /*
  55  * AD1938 volume/mute/de-emphasis etc. controls
  56  */
  57 static const char *ad1938_deemp[] = {"None", "48kHz", "44.1kHz", "32kHz"};
  58
  59 static const struct soc_enum ad1938_deemp_enum =
  60         SOC_ENUM_SINGLE(AD1938_DAC_CTRL2, 1, 4, ad1938_deemp);
  61
  62 static const struct snd_kcontrol_new ad1938_snd_controls[] = {
  63         /* DAC volume control */
  64         SOC_DOUBLE_R("DAC1  Volume", AD1938_DAC_L1_VOL,
  65                         AD1938_DAC_R1_VOL, 0, 0xFF, 1),
  66         SOC_DOUBLE_R("DAC2  Volume", AD1938_DAC_L2_VOL,
  67                         AD1938_DAC_R2_VOL, 0, 0xFF, 1),
  68         SOC_DOUBLE_R("DAC3  Volume", AD1938_DAC_L3_VOL,
  69                         AD1938_DAC_R3_VOL, 0, 0xFF, 1),
  70         SOC_DOUBLE_R("DAC4  Volume", AD1938_DAC_L4_VOL,
  71                         AD1938_DAC_R4_VOL, 0, 0xFF, 1),
  72
  73         /* ADC switch control */
  74         SOC_DOUBLE("ADC1 Switch", AD1938_ADC_CTRL0, AD1938_ADCL1_MUTE,
  75                 AD1938_ADCR1_MUTE, 1, 1),
  76         SOC_DOUBLE("ADC2 Switch", AD1938_ADC_CTRL0, AD1938_ADCL2_MUTE,
  77                 AD1938_ADCR2_MUTE, 1, 1),
  78
  79         /* DAC switch control */
  80         SOC_DOUBLE("DAC1 Switch", AD1938_DAC_CHNL_MUTE, AD1938_DACL1_MUTE,
  81                 AD1938_DACR1_MUTE, 1, 1),
  82         SOC_DOUBLE("DAC2 Switch", AD1938_DAC_CHNL_MUTE, AD1938_DACL2_MUTE,
  83                 AD1938_DACR2_MUTE, 1, 1),
  84         SOC_DOUBLE("DAC3 Switch", AD1938_DAC_CHNL_MUTE, AD1938_DACL3_MUTE,
  85                 AD1938_DACR3_MUTE, 1, 1),
  86         SOC_DOUBLE("DAC4 Switch", AD1938_DAC_CHNL_MUTE, AD1938_DACL4_MUTE,
  87                 AD1938_DACR4_MUTE, 1, 1),
  88
  89         /* ADC high-pass filter */
  90         SOC_SINGLE("ADC High Pass Filter Switch", AD1938_ADC_CTRL0,
  91                         AD1938_ADC_HIGHPASS_FILTER, 1, 0),
  92
  93         /* DAC de-emphasis */
  94         SOC_ENUM("Playback Deemphasis", ad1938_deemp_enum),
  95 };
  96
  97 static const struct snd_soc_dapm_widget ad1938_dapm_widgets[] = {
  98         SND_SOC_DAPM_DAC("DAC", "Playback", AD1938_DAC_CTRL0, 0, 1),
  99         SND_SOC_DAPM_ADC("ADC", "Capture", SND_SOC_NOPM, 0, 0),
 100         SND_SOC_DAPM_SUPPLY("ADC_PWR", AD1938_ADC_CTRL0, 0, 1, NULL, 0),
 101         SND_SOC_DAPM_OUTPUT("DAC1OUT"),
 102         SND_SOC_DAPM_OUTPUT("DAC2OUT"),
 103         SND_SOC_DAPM_OUTPUT("DAC3OUT"),
 104         SND_SOC_DAPM_OUTPUT("DAC4OUT"),
 105         SND_SOC_DAPM_INPUT("ADC1IN"),
 106         SND_SOC_DAPM_INPUT("ADC2IN"),
 107 };
 108
 109 static const struct snd_soc_dapm_route audio_paths[] = {
 110         { "DAC", NULL, "ADC_PWR" },
 111         { "ADC", NULL, "ADC_PWR" },
 112         { "DAC1OUT", "DAC1 Switch", "DAC" },
 113         { "DAC2OUT", "DAC2 Switch", "DAC" },
 114         { "DAC3OUT", "DAC3 Switch", "DAC" },
 115         { "DAC4OUT", "DAC4 Switch", "DAC" },
 116         { "ADC", "ADC1 Switch", "ADC1IN" },
 117         { "ADC", "ADC2 Switch", "ADC2IN" },
 118 };
 119
 120 /*
 121  * DAI ops entries
 122  */
 123
 124 static int ad1938_mute(struct snd_soc_dai *dai, int mute)
 125 {
 126         struct snd_soc_codec *codec = dai->codec;
 127         int reg;
 128
 129         reg = codec->read(codec, AD1938_DAC_CTRL2);
 130         reg = (mute > 0) ? reg | AD1938_DAC_MASTER_MUTE : reg &
 131                 (~AD1938_DAC_MASTER_MUTE);
 132         codec->write(codec, AD1938_DAC_CTRL2, reg);
 133
 134         return 0;
 135 }
 136
 137 static inline int ad1938_pll_powerctrl(struct snd_soc_codec *codec, int cmd)
 138 {
 139         int reg = codec->read(codec, AD1938_PLL_CLK_CTRL0);
 140         reg = (cmd > 0) ? reg & (~AD1938_PLL_POWERDOWN) : reg |
 141                 AD1938_PLL_POWERDOWN;
 142         codec->write(codec, AD1938_PLL_CLK_CTRL0, reg);
 143
 144         return 0;
 145 }
 146
 147 static int ad1938_set_tdm_slot(struct snd_soc_dai *dai, unsigned int tx_mask,
 148                                unsigned int mask, int slots, int width)
 149 {
 150         struct snd_soc_codec *codec = dai->codec;
 151         int dac_reg = codec->read(codec, AD1938_DAC_CTRL1);
 152         int adc_reg = codec->read(codec, AD1938_ADC_CTRL2);
 153
 154         dac_reg &= ~AD1938_DAC_CHAN_MASK;
 155         adc_reg &= ~AD1938_ADC_CHAN_MASK;
 156
 157         switch (slots) {
 158         case 2:
 159                 dac_reg |= AD1938_DAC_2_CHANNELS << AD1938_DAC_CHAN_SHFT;
 160                 adc_reg |= AD1938_ADC_2_CHANNELS << AD1938_ADC_CHAN_SHFT;
 161                 break;
 162         case 4:
 163                 dac_reg |= AD1938_DAC_4_CHANNELS << AD1938_DAC_CHAN_SHFT;
 164                 adc_reg |= AD1938_ADC_4_CHANNELS << AD1938_ADC_CHAN_SHFT;
 165                 break;
 166         case 8:
 167                 dac_reg |= AD1938_DAC_8_CHANNELS << AD1938_DAC_CHAN_SHFT;
 168                 adc_reg |= AD1938_ADC_8_CHANNELS << AD1938_ADC_CHAN_SHFT;
 169                 break;
 170         case 16:
 171                 dac_reg |= AD1938_DAC_16_CHANNELS << AD1938_DAC_CHAN_SHFT;
 172                 adc_reg |= AD1938_ADC_16_CHANNELS << AD1938_ADC_CHAN_SHFT;
 173                 break;
 174         default:
 175                 return -EINVAL;
 176         }
 177
 178         codec->write(codec, AD1938_DAC_CTRL1, dac_reg);
 179         codec->write(codec, AD1938_ADC_CTRL2, adc_reg);
 180
 181         return 0;
 182 }
 183
 184 static int ad1938_set_dai_fmt(struct snd_soc_dai *codec_dai,
 185                 unsigned int fmt)
 186 {
 187         struct snd_soc_codec *codec = codec_dai->codec;
 188         int adc_reg, dac_reg;
 189
 190         adc_reg = codec->read(codec, AD1938_ADC_CTRL2);
 191         dac_reg = codec->read(codec, AD1938_DAC_CTRL1);
 192
 193         /* At present, the driver only support AUX ADC mode(SND_SOC_DAIFMT_I2S
 194          * with TDM) and ADC&DAC TDM mode(SND_SOC_DAIFMT_DSP_A)
 195          */
 196         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 197         case SND_SOC_DAIFMT_I2S:
 198                 adc_reg &= ~AD1938_ADC_SERFMT_MASK;
 199                 adc_reg |= AD1938_ADC_SERFMT_TDM;
 200                 break;
 201         case SND_SOC_DAIFMT_DSP_A:
 202                 adc_reg &= ~AD1938_ADC_SERFMT_MASK;
 203                 adc_reg |= AD1938_ADC_SERFMT_AUX;
 204                 break;
 205         default:
 206                 return -EINVAL;
 207         }
 208
 209         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 210         case SND_SOC_DAIFMT_NB_NF: /* normal bit clock + frame */
 211                 adc_reg &= ~AD1938_ADC_LEFT_HIGH;
 212                 adc_reg &= ~AD1938_ADC_BCLK_INV;
 213                 dac_reg &= ~AD1938_DAC_LEFT_HIGH;
 214                 dac_reg &= ~AD1938_DAC_BCLK_INV;
 215                 break;
 216         case SND_SOC_DAIFMT_NB_IF: /* normal bclk + invert frm */
 217                 adc_reg |= AD1938_ADC_LEFT_HIGH;
 218                 adc_reg &= ~AD1938_ADC_BCLK_INV;
 219                 dac_reg |= AD1938_DAC_LEFT_HIGH;
 220                 dac_reg &= ~AD1938_DAC_BCLK_INV;
 221                 break;
 222         case SND_SOC_DAIFMT_IB_NF: /* invert bclk + normal frm */
 223                 adc_reg &= ~AD1938_ADC_LEFT_HIGH;
 224                 adc_reg |= AD1938_ADC_BCLK_INV;
 225                 dac_reg &= ~AD1938_DAC_LEFT_HIGH;
 226                 dac_reg |= AD1938_DAC_BCLK_INV;
 227                 break;
 228
 229         case SND_SOC_DAIFMT_IB_IF: /* invert bclk + frm */
 230                 adc_reg |= AD1938_ADC_LEFT_HIGH;
 231                 adc_reg |= AD1938_ADC_BCLK_INV;
 232                 dac_reg |= AD1938_DAC_LEFT_HIGH;
 233                 dac_reg |= AD1938_DAC_BCLK_INV;
 234                 break;
 235         default:
 236                 return -EINVAL;
 237         }
 238
 239         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 240         case SND_SOC_DAIFMT_CBM_CFM: /* codec clk & frm master */
 241                 adc_reg |= AD1938_ADC_LCR_MASTER;
 242                 adc_reg |= AD1938_ADC_BCLK_MASTER;
 243                 dac_reg |= AD1938_DAC_LCR_MASTER;
 244                 dac_reg |= AD1938_DAC_BCLK_MASTER;
 245                 break;
 246         case SND_SOC_DAIFMT_CBS_CFM: /* codec clk slave & frm master */
 247                 adc_reg |= AD1938_ADC_LCR_MASTER;
 248                 adc_reg &= ~AD1938_ADC_BCLK_MASTER;
 249                 dac_reg |= AD1938_DAC_LCR_MASTER;
 250                 dac_reg &= ~AD1938_DAC_BCLK_MASTER;
 251                 break;
 252         case SND_SOC_DAIFMT_CBM_CFS: /* codec clk master & frame slave */
 253                 adc_reg &= ~AD1938_ADC_LCR_MASTER;
 254                 adc_reg |= AD1938_ADC_BCLK_MASTER;
 255                 dac_reg &= ~AD1938_DAC_LCR_MASTER;
 256                 dac_reg |= AD1938_DAC_BCLK_MASTER;
 257                 break;
 258         case SND_SOC_DAIFMT_CBS_CFS: /* codec clk & frm slave */
 259                 adc_reg &= ~AD1938_ADC_LCR_MASTER;
 260                 adc_reg &= ~AD1938_ADC_BCLK_MASTER;
 261                 dac_reg &= ~AD1938_DAC_LCR_MASTER;
 262                 dac_reg &= ~AD1938_DAC_BCLK_MASTER;
 263                 break;
 264         default:
 265                 return -EINVAL;
 266         }
 267
 268         codec->write(codec, AD1938_ADC_CTRL2, adc_reg);
 269         codec->write(codec, AD1938_DAC_CTRL1, dac_reg);
 270
 271         return 0;
 272 }
 273
 274 static int ad1938_hw_params(struct snd_pcm_substream *substream,
 275                 struct snd_pcm_hw_params *params,
 276                 struct snd_soc_dai *dai)
 277 {
 278         int word_len = 0, reg = 0;
 279
 280         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 281         struct snd_soc_device *socdev = rtd->socdev;
 282         struct snd_soc_codec *codec = socdev->card->codec;
 283
 284         /* bit size */
 285         switch (params_format(params)) {
 286         case SNDRV_PCM_FORMAT_S16_LE:
 287                 word_len = 3;
 288                 break;
 289         case SNDRV_PCM_FORMAT_S20_3LE:
 290                 word_len = 1;
 291                 break;
 292         case SNDRV_PCM_FORMAT_S24_LE:
 293         case SNDRV_PCM_FORMAT_S32_LE:
 294                 word_len = 0;
 295                 break;
 296         }
 297
 298         reg = codec->read(codec, AD1938_DAC_CTRL2);
 299         reg = (reg & (~AD1938_DAC_WORD_LEN_MASK)) | word_len;
 300         codec->write(codec, AD1938_DAC_CTRL2, reg);
 301
 302         reg = codec->read(codec, AD1938_ADC_CTRL1);
 303         reg = (reg & (~AD1938_ADC_WORD_LEN_MASK)) | word_len;
 304         codec->write(codec, AD1938_ADC_CTRL1, reg);
 305
 306         return 0;
 307 }
 308
 309 static int ad1938_set_bias_level(struct snd_soc_codec *codec,
 310                 enum snd_soc_bias_level level)
 311 {
 312         switch (level) {
 313         case SND_SOC_BIAS_ON:
 314                 ad1938_pll_powerctrl(codec, 1);
 315                 break;
 316         case SND_SOC_BIAS_PREPARE:
 317                 break;
 318         case SND_SOC_BIAS_STANDBY:
 319         case SND_SOC_BIAS_OFF:
 320                 ad1938_pll_powerctrl(codec, 0);
 321                 break;
 322         }
 323         codec->bias_level = level;
 324         return 0;
 325 }
 326
 327 /*
 328  * interface to read/write ad1938 register
 329  */
 330
 331 #define AD1938_SPI_ADDR    0x4
 332 #define AD1938_SPI_READ    0x1
 333 #define AD1938_SPI_BUFLEN  3
 334
 335 /*
 336  * write to the ad1938 register space
 337  */
 338
 339 static int ad1938_write_reg(struct snd_soc_codec *codec, unsigned int reg,
 340                 unsigned int value)
 341 {
 342         u8 *reg_cache = codec->reg_cache;
 343         int ret = 0;
 344
 345         if (value != reg_cache[reg]) {
 346                 uint8_t buf[AD1938_SPI_BUFLEN];
 347                 struct spi_transfer t = {
 348                         .tx_buf = buf,
 349                         .len = AD1938_SPI_BUFLEN,
 350                 };
 351                 struct spi_message m;
 352
 353                 buf[0] = AD1938_SPI_ADDR << 1;
 354                 buf[1] = reg;
 355                 buf[2] = value;
 356                 spi_message_init(&m);
 357                 spi_message_add_tail(&t, &m);
 358                 ret = spi_sync(codec->control_data, &m);
 359                 if (ret == 0)
 360                         reg_cache[reg] = value;
 361         }
 362
 363         return ret;
 364 }
 365
 366 /*
 367  * read from the ad1938 register space cache
 368  */
 369
 370 static unsigned int ad1938_read_reg_cache(struct snd_soc_codec *codec,
 371                                           unsigned int reg)
 372 {
 373         u8 *reg_cache = codec->reg_cache;
 374
 375         if (reg >= codec->reg_cache_size)
 376                 return -EINVAL;
 377
 378         return reg_cache[reg];
 379 }
 380
 381 /*
 382  * read from the ad1938 register space
 383  */
 384
 385 static unsigned int ad1938_read_reg(struct snd_soc_codec *codec,
 386                                                 unsigned int reg)
 387 {
 388         char w_buf[AD1938_SPI_BUFLEN];
 389         char r_buf[AD1938_SPI_BUFLEN];
 390         int ret;
 391
 392         struct spi_transfer t = {
 393                 .tx_buf = w_buf,
 394                 .rx_buf = r_buf,
 395                 .len = AD1938_SPI_BUFLEN,
 396         };
 397         struct spi_message m;
 398
 399         w_buf[0] = (AD1938_SPI_ADDR << 1) | AD1938_SPI_READ;
 400         w_buf[1] = reg;
 401         w_buf[2] = 0;
 402
 403         spi_message_init(&m);
 404         spi_message_add_tail(&t, &m);
 405         ret = spi_sync(codec->control_data, &m);
 406         if (ret == 0)
 407                 return  r_buf[2];
 408         else
 409                 return -EIO;
 410 }
 411
 412 static int ad1938_fill_cache(struct snd_soc_codec *codec)
 413 {
 414         int i;
 415         u8 *reg_cache = codec->reg_cache;
 416         struct spi_device *spi = codec->control_data;
 417
 418         for (i = 0; i < codec->reg_cache_size; i++) {
 419                 int ret = ad1938_read_reg(codec, i);
 420                 if (ret == -EIO) {
 421                         dev_err(&spi->dev, "AD1938 SPI read failure\n");
 422                         return ret;
 423                 }
 424                 reg_cache[i] = ret;
 425         }
 426
 427         return 0;
 428 }
 429
 430 static int __devinit ad1938_spi_probe(struct spi_device *spi)
 431 {
 432         struct snd_soc_codec *codec;
 433         struct ad1938_priv *ad1938;
 434
 435         ad1938 = kzalloc(sizeof(struct ad1938_priv), GFP_KERNEL);
 436         if (ad1938 == NULL)
 437                 return -ENOMEM;
 438
 439         codec = &ad1938->codec;
 440         codec->control_data = spi;
 441         codec->dev = &spi->dev;
 442
 443         dev_set_drvdata(&spi->dev, ad1938);
 444
 445         return ad1938_register(ad1938);
 446 }
 447
 448 static int __devexit ad1938_spi_remove(struct spi_device *spi)
 449 {
 450         struct ad1938_priv *ad1938 = dev_get_drvdata(&spi->dev);
 451
 452         ad1938_unregister(ad1938);
 453         return 0;
 454 }
 455
 456 static struct spi_driver ad1938_spi_driver = {
 457         .driver = {
 458                 .name   = "ad1938",
 459                 .owner  = THIS_MODULE,
 460         },
 461         .probe          = ad1938_spi_probe,
 462         .remove         = __devexit_p(ad1938_spi_remove),
 463 };
 464
 465 static struct snd_soc_dai_ops ad1938_dai_ops = {
 466         .hw_params = ad1938_hw_params,
 467         .digital_mute = ad1938_mute,
 468         .set_tdm_slot = ad1938_set_tdm_slot,
 469         .set_fmt = ad1938_set_dai_fmt,
 470 };
 471
 472 /* codec DAI instance */
 473 struct snd_soc_dai ad1938_dai = {
 474         .name = "AD1938",
 475         .playback = {
 476                 .stream_name = "Playback",
 477                 .channels_min = 2,
 478                 .channels_max = 8,
 479                 .rates = SNDRV_PCM_RATE_48000,
 480                 .formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE |
 481                         SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S24_LE,
 482         },
 483         .capture = {
 484                 .stream_name = "Capture",
 485                 .channels_min = 2,
 486                 .channels_max = 4,
 487                 .rates = SNDRV_PCM_RATE_48000,
 488                 .formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE |
 489                         SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S24_LE,
 490         },
 491         .ops = &ad1938_dai_ops,
 492 };
 493 EXPORT_SYMBOL_GPL(ad1938_dai);
 494
 495 static int ad1938_register(struct ad1938_priv *ad1938)
 496 {
 497         int ret;
 498         struct snd_soc_codec *codec = &ad1938->codec;
 499
 500         if (ad1938_codec) {
 501                 dev_err(codec->dev, "Another ad1938 is registered\n");
 502                 return -EINVAL;
 503         }
 504
 505         mutex_init(&codec->mutex);
 506         INIT_LIST_HEAD(&codec->dapm_widgets);
 507         INIT_LIST_HEAD(&codec->dapm_paths);
 508         codec->private_data = ad1938;
 509         codec->reg_cache = ad1938->reg_cache;
 510         codec->reg_cache_size = AD1938_NUM_REGS;
 511         codec->name = "AD1938";
 512         codec->owner = THIS_MODULE;
 513         codec->dai = &ad1938_dai;
 514         codec->num_dai = 1;
 515         codec->write = ad1938_write_reg;
 516         codec->read = ad1938_read_reg_cache;
 517         codec->set_bias_level = ad1938_set_bias_level;
 518         INIT_LIST_HEAD(&codec->dapm_widgets);
 519         INIT_LIST_HEAD(&codec->dapm_paths);
 520
 521         ad1938_dai.dev = codec->dev;
 522         ad1938_codec = codec;
 523
 524         /* default setting for ad1938 */
 525
 526         /* unmute dac channels */
 527         codec->write(codec, AD1938_DAC_CHNL_MUTE, 0x0);
 528         /* de-emphasis: 48kHz, powedown dac */
 529         codec->write(codec, AD1938_DAC_CTRL2, 0x1A);
 530         /* powerdown dac, dac in tdm mode */
 531         codec->write(codec, AD1938_DAC_CTRL0, 0x41);
 532         /* high-pass filter enable */
 533         codec->write(codec, AD1938_ADC_CTRL0, 0x3);
 534         /* sata delay=1, adc aux mode */
 535         codec->write(codec, AD1938_ADC_CTRL1, 0x43);
 536         /* pll input: mclki/xi */
 537         codec->write(codec, AD1938_PLL_CLK_CTRL0, 0x9D);
 538         codec->write(codec, AD1938_PLL_CLK_CTRL1, 0x04);
 539
 540         ad1938_fill_cache(codec);
 541
 542         ret = snd_soc_register_codec(codec);
 543         if (ret != 0) {
 544                 dev_err(codec->dev, "Failed to register codec: %d\n", ret);
 545                 kfree(ad1938);
 546                 return ret;
 547         }
 548
 549         ret = snd_soc_register_dai(&ad1938_dai);
 550         if (ret != 0) {
 551                 dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
 552                 snd_soc_unregister_codec(codec);
 553                 kfree(ad1938);
 554                 return ret;
 555         }
 556
 557         return 0;
 558 }
 559
 560 static void ad1938_unregister(struct ad1938_priv *ad1938)
 561 {
 562         ad1938_set_bias_level(&ad1938->codec, SND_SOC_BIAS_OFF);
 563         snd_soc_unregister_dai(&ad1938_dai);
 564         snd_soc_unregister_codec(&ad1938->codec);
 565         kfree(ad1938);
 566         ad1938_codec = NULL;
 567 }
 568
 569 static int ad1938_probe(struct platform_device *pdev)
 570 {
 571         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 572         struct snd_soc_codec *codec;
 573         int ret = 0;
 574
 575         if (ad1938_codec == NULL) {
 576                 dev_err(&pdev->dev, "Codec device not registered\n");
 577                 return -ENODEV;
 578         }
 579
 580         socdev->card->codec = ad1938_codec;
 581         codec = ad1938_codec;
 582
 583         /* register pcms */
 584         ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
 585         if (ret < 0) {
 586                 dev_err(codec->dev, "failed to create pcms: %d\n", ret);
 587                 goto pcm_err;
 588         }
 589
 590         snd_soc_add_controls(codec, ad1938_snd_controls,
 591                              ARRAY_SIZE(ad1938_snd_controls));
 592         snd_soc_dapm_new_controls(codec, ad1938_dapm_widgets,
 593                                   ARRAY_SIZE(ad1938_dapm_widgets));
 594         snd_soc_dapm_add_routes(codec, audio_paths, ARRAY_SIZE(audio_paths));
 595         snd_soc_dapm_new_widgets(codec);
 596
 597         ad1938_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 598
 599         ret = snd_soc_init_card(socdev);
 600         if (ret < 0) {
 601                 dev_err(codec->dev, "failed to register card: %d\n", ret);
 602                 goto card_err;
 603         }
 604
 605         return ret;
 606
 607 card_err:
 608         snd_soc_free_pcms(socdev);
 609         snd_soc_dapm_free(socdev);
 610 pcm_err:
 611         return ret;
 612 }
 613
 614 /* power down chip */
 615 static int ad1938_remove(struct platform_device *pdev)
 616 {
 617         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 618
 619         snd_soc_free_pcms(socdev);
 620         snd_soc_dapm_free(socdev);
 621
 622         return 0;
 623 }
 624
 625 #ifdef CONFIG_PM
 626 static int ad1938_suspend(struct platform_device *pdev,
 627                 pm_message_t state)
 628 {
 629         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 630         struct snd_soc_codec *codec = socdev->card->codec;
 631
 632         ad1938_set_bias_level(codec, SND_SOC_BIAS_OFF);
 633         return 0;
 634 }
 635
 636 static int ad1938_resume(struct platform_device *pdev)
 637 {
 638         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 639         struct snd_soc_codec *codec = socdev->card->codec;
 640
 641         if (codec->suspend_bias_level == SND_SOC_BIAS_ON)
 642                 ad1938_set_bias_level(codec, SND_SOC_BIAS_ON);
 643
 644         return 0;
 645 }
 646 #else
 647 #define ad1938_suspend NULL
 648 #define ad1938_resume NULL
 649 #endif
 650
 651 struct snd_soc_codec_device soc_codec_dev_ad1938 = {
 652         .probe =        ad1938_probe,
 653         .remove =       ad1938_remove,
 654         .suspend =      ad1938_suspend,
 655         .resume =       ad1938_resume,
 656 };
 657 EXPORT_SYMBOL_GPL(soc_codec_dev_ad1938);
 658
 659 static int __init ad1938_init(void)
 660 {
 661         int ret;
 662
 663         ret = spi_register_driver(&ad1938_spi_driver);
 664         if (ret != 0) {
 665                 printk(KERN_ERR "Failed to register ad1938 SPI driver: %d\n",
 666                                 ret);
 667         }
 668
 669         return ret;
 670 }
 671 module_init(ad1938_init);
 672
 673 static void __exit ad1938_exit(void)
 674 {
 675         spi_unregister_driver(&ad1938_spi_driver);
 676 }
 677 module_exit(ad1938_exit);
 678
 679 MODULE_DESCRIPTION("ASoC ad1938 driver");
 680 MODULE_AUTHOR("Barry Song ");
 681 MODULE_LICENSE("GPL");