sound/soc/codecs/ad1836.c

   1 /*
   2  * File:         sound/soc/codecs/ad1836.c
   3  * Author:       Barry Song <Barry.Song@analog.com>
   4  *
   5  * Created:      Aug 04 2009
   6  * Description:  Driver for AD1836 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
  19 #include <linux/init.h>
  20 #include <linux/module.h>
  21 #include <linux/version.h>
  22 #include <linux/kernel.h>
  23 #include <linux/device.h>
  24 #include <sound/core.h>
  25 #include <sound/pcm.h>
  26 #include <sound/pcm_params.h>
  27 #include <sound/initval.h>
  28 #include <sound/soc.h>
  29 #include <sound/tlv.h>
  30 #include <sound/soc-dapm.h>
  31 #include <linux/spi/spi.h>
  32 #include "ad1836.h"
  33
  34 /* codec private data */
  35 struct ad1836_priv {
  36         struct snd_soc_codec codec;
  37         u16 reg_cache[AD1836_NUM_REGS];
  38 };
  39
  40 static struct snd_soc_codec *ad1836_codec;
  41 struct snd_soc_codec_device soc_codec_dev_ad1836;
  42 static int ad1836_register(struct ad1836_priv *ad1836);
  43 static void ad1836_unregister(struct ad1836_priv *ad1836);
  44
  45 /*
  46  * AD1836 volume/mute/de-emphasis etc. controls
  47  */
  48 static const char *ad1836_deemp[] = {"None", "44.1kHz", "32kHz", "48kHz"};
  49
  50 static const struct soc_enum ad1836_deemp_enum =
  51         SOC_ENUM_SINGLE(AD1836_DAC_CTRL1, 8, 4, ad1836_deemp);
  52
  53 static const struct snd_kcontrol_new ad1836_snd_controls[] = {
  54         /* DAC volume control */
  55         SOC_DOUBLE_R("DAC1 Volume", AD1836_DAC_L1_VOL,
  56                         AD1836_DAC_R1_VOL, 0, 0x3FF, 0),
  57         SOC_DOUBLE_R("DAC2 Volume", AD1836_DAC_L2_VOL,
  58                         AD1836_DAC_R2_VOL, 0, 0x3FF, 0),
  59         SOC_DOUBLE_R("DAC3 Volume", AD1836_DAC_L3_VOL,
  60                         AD1836_DAC_R3_VOL, 0, 0x3FF, 0),
  61
  62         /* ADC switch control */
  63         SOC_DOUBLE("ADC1 Switch", AD1836_ADC_CTRL2, AD1836_ADCL1_MUTE,
  64                 AD1836_ADCR1_MUTE, 1, 1),
  65         SOC_DOUBLE("ADC2 Switch", AD1836_ADC_CTRL2, AD1836_ADCL2_MUTE,
  66                 AD1836_ADCR2_MUTE, 1, 1),
  67
  68         /* DAC switch control */
  69         SOC_DOUBLE("DAC1 Switch", AD1836_DAC_CTRL2, AD1836_DACL1_MUTE,
  70                 AD1836_DACR1_MUTE, 1, 1),
  71         SOC_DOUBLE("DAC2 Switch", AD1836_DAC_CTRL2, AD1836_DACL2_MUTE,
  72                 AD1836_DACR2_MUTE, 1, 1),
  73         SOC_DOUBLE("DAC3 Switch", AD1836_DAC_CTRL2, AD1836_DACL3_MUTE,
  74                 AD1836_DACR3_MUTE, 1, 1),
  75
  76         /* ADC high-pass filter */
  77         SOC_SINGLE("ADC High Pass Filter Switch", AD1836_ADC_CTRL1,
  78                         AD1836_ADC_HIGHPASS_FILTER, 1, 0),
  79
  80         /* DAC de-emphasis */
  81         SOC_ENUM("Playback Deemphasis", ad1836_deemp_enum),
  82 };
  83
  84 static const struct snd_soc_dapm_widget ad1836_dapm_widgets[] = {
  85         SND_SOC_DAPM_DAC("DAC", "Playback", AD1836_DAC_CTRL1,
  86                                 AD1836_DAC_POWERDOWN, 1),
  87         SND_SOC_DAPM_ADC("ADC", "Capture", SND_SOC_NOPM, 0, 0),
  88         SND_SOC_DAPM_SUPPLY("ADC_PWR", AD1836_ADC_CTRL1,
  89                                 AD1836_ADC_POWERDOWN, 1, NULL, 0),
  90         SND_SOC_DAPM_OUTPUT("DAC1OUT"),
  91         SND_SOC_DAPM_OUTPUT("DAC2OUT"),
  92         SND_SOC_DAPM_OUTPUT("DAC3OUT"),
  93         SND_SOC_DAPM_INPUT("ADC1IN"),
  94         SND_SOC_DAPM_INPUT("ADC2IN"),
  95 };
  96
  97 static const struct snd_soc_dapm_route audio_paths[] = {
  98         { "DAC", NULL, "ADC_PWR" },
  99         { "ADC", NULL, "ADC_PWR" },
 100         { "DAC1OUT", "DAC1 Switch", "DAC" },
 101         { "DAC2OUT", "DAC2 Switch", "DAC" },
 102         { "DAC3OUT", "DAC3 Switch", "DAC" },
 103         { "ADC", "ADC1 Switch", "ADC1IN" },
 104         { "ADC", "ADC2 Switch", "ADC2IN" },
 105 };
 106
 107 /*
 108  * DAI ops entries
 109  */
 110
 111 static int ad1836_set_dai_fmt(struct snd_soc_dai *codec_dai,
 112                 unsigned int fmt)
 113 {
 114         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 115         /* at present, we support adc aux mode to interface with
 116          * blackfin sport tdm mode
 117          */
 118         case SND_SOC_DAIFMT_DSP_A:
 119                 break;
 120         default:
 121                 return -EINVAL;
 122         }
 123
 124         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 125         case SND_SOC_DAIFMT_IB_IF:
 126                 break;
 127         default:
 128                 return -EINVAL;
 129         }
 130
 131         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 132         /* ALCLK,ABCLK are both output, AD1836 can only be master */
 133         case SND_SOC_DAIFMT_CBM_CFM:
 134                 break;
 135         default:
 136                 return -EINVAL;
 137         }
 138
 139         return 0;
 140 }
 141
 142 static int ad1836_hw_params(struct snd_pcm_substream *substream,
 143                 struct snd_pcm_hw_params *params,
 144                 struct snd_soc_dai *dai)
 145 {
 146         int word_len = 0;
 147
 148         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 149         struct snd_soc_device *socdev = rtd->socdev;
 150         struct snd_soc_codec *codec = socdev->card->codec;
 151
 152         /* bit size */
 153         switch (params_format(params)) {
 154         case SNDRV_PCM_FORMAT_S16_LE:
 155                 word_len = 3;
 156                 break;
 157         case SNDRV_PCM_FORMAT_S20_3LE:
 158                 word_len = 1;
 159                 break;
 160         case SNDRV_PCM_FORMAT_S24_LE:
 161         case SNDRV_PCM_FORMAT_S32_LE:
 162                 word_len = 0;
 163                 break;
 164         }
 165
 166         snd_soc_update_bits(codec, AD1836_DAC_CTRL1,
 167                 AD1836_DAC_WORD_LEN_MASK, word_len);
 168
 169         snd_soc_update_bits(codec, AD1836_ADC_CTRL2,
 170                 AD1836_ADC_WORD_LEN_MASK, word_len);
 171
 172         return 0;
 173 }
 174
 175
 176 /*
 177  * interface to read/write ad1836 register
 178  */
 179 #define AD1836_SPI_REG_SHFT 12
 180 #define AD1836_SPI_READ     (1 << 11)
 181 #define AD1836_SPI_VAL_MSK  0x3FF
 182
 183 /*
 184  * write to the ad1836 register space
 185  */
 186
 187 static int ad1836_write_reg(struct snd_soc_codec *codec, unsigned int reg,
 188                 unsigned int value)
 189 {
 190         u16 *reg_cache = codec->reg_cache;
 191         int ret = 0;
 192
 193         if (value != reg_cache[reg]) {
 194                 unsigned short buf;
 195                 struct spi_transfer t = {
 196                         .tx_buf = &buf,
 197                         .len = 2,
 198                 };
 199                 struct spi_message m;
 200
 201                 buf = (reg << AD1836_SPI_REG_SHFT) |
 202                         (value & AD1836_SPI_VAL_MSK);
 203                 spi_message_init(&m);
 204                 spi_message_add_tail(&t, &m);
 205                 ret = spi_sync(codec->control_data, &m);
 206                 if (ret == 0)
 207                         reg_cache[reg] = value;
 208         }
 209
 210         return ret;
 211 }
 212
 213 /*
 214  * read from the ad1836 register space cache
 215  */
 216 static unsigned int ad1836_read_reg_cache(struct snd_soc_codec *codec,
 217                                           unsigned int reg)
 218 {
 219         u16 *reg_cache = codec->reg_cache;
 220
 221         if (reg >= codec->reg_cache_size)
 222                 return -EINVAL;
 223
 224         return reg_cache[reg];
 225 }
 226
 227 static int __devinit ad1836_spi_probe(struct spi_device *spi)
 228 {
 229         struct snd_soc_codec *codec;
 230         struct ad1836_priv *ad1836;
 231
 232         ad1836 = kzalloc(sizeof(struct ad1836_priv), GFP_KERNEL);
 233         if (ad1836 == NULL)
 234                 return -ENOMEM;
 235
 236         codec = &ad1836->codec;
 237         codec->control_data = spi;
 238         codec->dev = &spi->dev;
 239
 240         dev_set_drvdata(&spi->dev, ad1836);
 241
 242         return ad1836_register(ad1836);
 243 }
 244
 245 static int __devexit ad1836_spi_remove(struct spi_device *spi)
 246 {
 247         struct ad1836_priv *ad1836 = dev_get_drvdata(&spi->dev);
 248
 249         ad1836_unregister(ad1836);
 250         return 0;
 251 }
 252
 253 static struct spi_driver ad1836_spi_driver = {
 254         .driver = {
 255                 .name   = "ad1836-spi",
 256                 .bus    = &spi_bus_type,
 257                 .owner  = THIS_MODULE,
 258         },
 259         .probe          = ad1836_spi_probe,
 260         .remove         = __devexit_p(ad1836_spi_remove),
 261 };
 262
 263 static struct snd_soc_dai_ops ad1836_dai_ops = {
 264         .hw_params = ad1836_hw_params,
 265         .set_fmt = ad1836_set_dai_fmt,
 266 };
 267
 268 /* codec DAI instance */
 269 struct snd_soc_dai ad1836_dai = {
 270         .name = "AD1836",
 271         .playback = {
 272                 .stream_name = "Playback",
 273                 .channels_min = 2,
 274                 .channels_max = 6,
 275                 .rates = SNDRV_PCM_RATE_48000,
 276                 .formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE |
 277                         SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S24_LE,
 278         },
 279         .capture = {
 280                 .stream_name = "Capture",
 281                 .channels_min = 2,
 282                 .channels_max = 4,
 283                 .rates = SNDRV_PCM_RATE_48000,
 284                 .formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE |
 285                         SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S24_LE,
 286         },
 287         .ops = &ad1836_dai_ops,
 288 };
 289 EXPORT_SYMBOL_GPL(ad1836_dai);
 290
 291 static int ad1836_register(struct ad1836_priv *ad1836)
 292 {
 293         int ret;
 294         struct snd_soc_codec *codec = &ad1836->codec;
 295
 296         if (ad1836_codec) {
 297                 dev_err(codec->dev, "Another ad1836 is registered\n");
 298                 return -EINVAL;
 299         }
 300
 301         mutex_init(&codec->mutex);
 302         INIT_LIST_HEAD(&codec->dapm_widgets);
 303         INIT_LIST_HEAD(&codec->dapm_paths);
 304         codec->private_data = ad1836;
 305         codec->reg_cache = ad1836->reg_cache;
 306         codec->reg_cache_size = AD1836_NUM_REGS;
 307         codec->name = "AD1836";
 308         codec->owner = THIS_MODULE;
 309         codec->dai = &ad1836_dai;
 310         codec->num_dai = 1;
 311         codec->write = ad1836_write_reg;
 312         codec->read = ad1836_read_reg_cache;
 313         INIT_LIST_HEAD(&codec->dapm_widgets);
 314         INIT_LIST_HEAD(&codec->dapm_paths);
 315
 316         ad1836_dai.dev = codec->dev;
 317         ad1836_codec = codec;
 318
 319         /* default setting for ad1836 */
 320         /* de-emphasis: 48kHz, power-on dac */
 321         codec->write(codec, AD1836_DAC_CTRL1, 0x300);
 322         /* unmute dac channels */
 323         codec->write(codec, AD1836_DAC_CTRL2, 0x0);
 324         /* high-pass filter enable, power-on adc */
 325         codec->write(codec, AD1836_ADC_CTRL1, 0x100);
 326         /* unmute adc channles, adc aux mode */
 327         codec->write(codec, AD1836_ADC_CTRL2, 0x180);
 328         /* left/right diff:PGA/MUX */
 329         codec->write(codec, AD1836_ADC_CTRL3, 0x3A);
 330         /* volume */
 331         codec->write(codec, AD1836_DAC_L1_VOL, 0x3FF);
 332         codec->write(codec, AD1836_DAC_R1_VOL, 0x3FF);
 333         codec->write(codec, AD1836_DAC_L2_VOL, 0x3FF);
 334         codec->write(codec, AD1836_DAC_R2_VOL, 0x3FF);
 335         codec->write(codec, AD1836_DAC_L3_VOL, 0x3FF);
 336         codec->write(codec, AD1836_DAC_R3_VOL, 0x3FF);
 337
 338         ret = snd_soc_register_codec(codec);
 339         if (ret != 0) {
 340                 dev_err(codec->dev, "Failed to register codec: %d\n", ret);
 341                 kfree(ad1836);
 342                 return ret;
 343         }
 344
 345         ret = snd_soc_register_dai(&ad1836_dai);
 346         if (ret != 0) {
 347                 dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
 348                 snd_soc_unregister_codec(codec);
 349                 kfree(ad1836);
 350                 return ret;
 351         }
 352
 353         return 0;
 354 }
 355
 356 static void ad1836_unregister(struct ad1836_priv *ad1836)
 357 {
 358         snd_soc_unregister_dai(&ad1836_dai);
 359         snd_soc_unregister_codec(&ad1836->codec);
 360         kfree(ad1836);
 361         ad1836_codec = NULL;
 362 }
 363
 364 static int ad1836_probe(struct platform_device *pdev)
 365 {
 366         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 367         struct snd_soc_codec *codec;
 368         int ret = 0;
 369
 370         if (ad1836_codec == NULL) {
 371                 dev_err(&pdev->dev, "Codec device not registered\n");
 372                 return -ENODEV;
 373         }
 374
 375         socdev->card->codec = ad1836_codec;
 376         codec = ad1836_codec;
 377
 378         /* register pcms */
 379         ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
 380         if (ret < 0) {
 381                 dev_err(codec->dev, "failed to create pcms: %d\n", ret);
 382                 goto pcm_err;
 383         }
 384
 385         snd_soc_add_controls(codec, ad1836_snd_controls,
 386                              ARRAY_SIZE(ad1836_snd_controls));
 387         snd_soc_dapm_new_controls(codec, ad1836_dapm_widgets,
 388                                   ARRAY_SIZE(ad1836_dapm_widgets));
 389         snd_soc_dapm_add_routes(codec, audio_paths, ARRAY_SIZE(audio_paths));
 390         snd_soc_dapm_new_widgets(codec);
 391
 392         ret = snd_soc_init_card(socdev);
 393         if (ret < 0) {
 394                 dev_err(codec->dev, "failed to register card: %d\n", ret);
 395                 goto card_err;
 396         }
 397
 398         return ret;
 399
 400 card_err:
 401         snd_soc_free_pcms(socdev);
 402         snd_soc_dapm_free(socdev);
 403 pcm_err:
 404         return ret;
 405 }
 406
 407 /* power down chip */
 408 static int ad1836_remove(struct platform_device *pdev)
 409 {
 410         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 411
 412         snd_soc_free_pcms(socdev);
 413         snd_soc_dapm_free(socdev);
 414
 415         return 0;
 416 }
 417
 418 struct snd_soc_codec_device soc_codec_dev_ad1836 = {
 419         .probe =        ad1836_probe,
 420         .remove =       ad1836_remove,
 421 };
 422 EXPORT_SYMBOL_GPL(soc_codec_dev_ad1836);
 423
 424 static int __init ad1836_init(void)
 425 {
 426         int ret;
 427
 428         ret = spi_register_driver(&ad1836_spi_driver);
 429         if (ret != 0) {
 430                 printk(KERN_ERR "Failed to register ad1836 SPI driver: %d\n",
 431                                 ret);
 432         }
 433
 434         return ret;
 435 }
 436 module_init(ad1836_init);
 437
 438 static void __exit ad1836_exit(void)
 439 {
 440         spi_unregister_driver(&ad1836_spi_driver);
 441 }
 442 module_exit(ad1836_exit);
 443
 444 MODULE_DESCRIPTION("ASoC ad1836 driver");
 445 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
 446 MODULE_LICENSE("GPL");