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