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