sound/soc/codecs/tlv320aic26.c

   1 /*
   2  * Texas Instruments TLV320AIC26 low power audio CODEC
   3  * ALSA SoC CODEC driver
   4  *
   5  * Copyright (C) 2008 Secret Lab Technologies Ltd.
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/moduleparam.h>
  10 #include <linux/init.h>
  11 #include <linux/delay.h>
  12 #include <linux/pm.h>
  13 #include <linux/device.h>
  14 #include <linux/sysfs.h>
  15 #include <linux/spi/spi.h>
  16 #include <sound/core.h>
  17 #include <sound/pcm.h>
  18 #include <sound/pcm_params.h>
  19 #include <sound/soc.h>
  20 #include <sound/soc-dapm.h>
  21 #include <sound/soc-of-simple.h>
  22 #include <sound/initval.h>
  23
  24 #include "tlv320aic26.h"
  25
  26 MODULE_DESCRIPTION("ASoC TLV320AIC26 codec driver");
  27 MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
  28 MODULE_LICENSE("GPL");
  29
  30 /* AIC26 driver private data */
  31 struct aic26 {
  32         struct spi_device *spi;
  33         struct snd_soc_codec codec;
  34         u16 reg_cache[AIC26_NUM_REGS];  /* shadow registers */
  35         int master;
  36         int datfm;
  37         int mclk;
  38
  39         /* Keyclick parameters */
  40         int keyclick_amplitude;
  41         int keyclick_freq;
  42         int keyclick_len;
  43 };
  44
  45 /* ---------------------------------------------------------------------
  46  * Register access routines
  47  */
  48 static unsigned int aic26_reg_read(struct snd_soc_codec *codec,
  49                                    unsigned int reg)
  50 {
  51         struct aic26 *aic26 = codec->private_data;
  52         u16 *cache = codec->reg_cache;
  53         u16 cmd, value;
  54         u8 buffer[2];
  55         int rc;
  56
  57         if (reg >= AIC26_NUM_REGS) {
  58                 WARN_ON_ONCE(1);
  59                 return 0;
  60         }
  61
  62         /* Do SPI transfer; first 16bits are command; remaining is
  63          * register contents */
  64         cmd = AIC26_READ_COMMAND_WORD(reg);
  65         buffer[0] = (cmd >> 8) & 0xff;
  66         buffer[1] = cmd & 0xff;
  67         rc = spi_write_then_read(aic26->spi, buffer, 2, buffer, 2);
  68         if (rc) {
  69                 dev_err(&aic26->spi->dev, "AIC26 reg read error\n");
  70                 return -EIO;
  71         }
  72         value = (buffer[0] << 8) | buffer[1];
  73
  74         /* Update the cache before returning with the value */
  75         cache[reg] = value;
  76         return value;
  77 }
  78
  79 static unsigned int aic26_reg_read_cache(struct snd_soc_codec *codec,
  80                                          unsigned int reg)
  81 {
  82         u16 *cache = codec->reg_cache;
  83
  84         if (reg >= AIC26_NUM_REGS) {
  85                 WARN_ON_ONCE(1);
  86                 return 0;
  87         }
  88
  89         return cache[reg];
  90 }
  91
  92 static int aic26_reg_write(struct snd_soc_codec *codec, unsigned int reg,
  93                            unsigned int value)
  94 {
  95         struct aic26 *aic26 = codec->private_data;
  96         u16 *cache = codec->reg_cache;
  97         u16 cmd;
  98         u8 buffer[4];
  99         int rc;
 100
 101         if (reg >= AIC26_NUM_REGS) {
 102                 WARN_ON_ONCE(1);
 103                 return -EINVAL;
 104         }
 105
 106         /* Do SPI transfer; first 16bits are command; remaining is data
 107          * to write into register */
 108         cmd = AIC26_WRITE_COMMAND_WORD(reg);
 109         buffer[0] = (cmd >> 8) & 0xff;
 110         buffer[1] = cmd & 0xff;
 111         buffer[2] = value >> 8;
 112         buffer[3] = value;
 113         rc = spi_write(aic26->spi, buffer, 4);
 114         if (rc) {
 115                 dev_err(&aic26->spi->dev, "AIC26 reg read error\n");
 116                 return -EIO;
 117         }
 118
 119         /* update cache before returning */
 120         cache[reg] = value;
 121         return 0;
 122 }
 123
 124 /* ---------------------------------------------------------------------
 125  * Digital Audio Interface Operations
 126  */
 127 static int aic26_hw_params(struct snd_pcm_substream *substream,
 128                            struct snd_pcm_hw_params *params,
 129                            struct snd_soc_dai *dai)
 130 {
 131         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 132         struct snd_soc_device *socdev = rtd->socdev;
 133         struct snd_soc_codec *codec = socdev->card->codec;
 134         struct aic26 *aic26 = codec->private_data;
 135         int fsref, divisor, wlen, pval, jval, dval, qval;
 136         u16 reg;
 137
 138         dev_dbg(&aic26->spi->dev, "aic26_hw_params(substream=%p, params=%p)\n",
 139                 substream, params);
 140         dev_dbg(&aic26->spi->dev, "rate=%i format=%i\n", params_rate(params),
 141                 params_format(params));
 142
 143         switch (params_rate(params)) {
 144         case 8000:  fsref = 48000; divisor = AIC26_DIV_6; break;
 145         case 11025: fsref = 44100; divisor = AIC26_DIV_4; break;
 146         case 12000: fsref = 48000; divisor = AIC26_DIV_4; break;
 147         case 16000: fsref = 48000; divisor = AIC26_DIV_3; break;
 148         case 22050: fsref = 44100; divisor = AIC26_DIV_2; break;
 149         case 24000: fsref = 48000; divisor = AIC26_DIV_2; break;
 150         case 32000: fsref = 48000; divisor = AIC26_DIV_1_5; break;
 151         case 44100: fsref = 44100; divisor = AIC26_DIV_1; break;
 152         case 48000: fsref = 48000; divisor = AIC26_DIV_1; break;
 153         default:
 154                 dev_dbg(&aic26->spi->dev, "bad rate\n"); return -EINVAL;
 155         }
 156
 157         /* select data word length */
 158         switch (params_format(params)) {
 159         case SNDRV_PCM_FORMAT_S8:     wlen = AIC26_WLEN_16; break;
 160         case SNDRV_PCM_FORMAT_S16_BE: wlen = AIC26_WLEN_16; break;
 161         case SNDRV_PCM_FORMAT_S24_BE: wlen = AIC26_WLEN_24; break;
 162         case SNDRV_PCM_FORMAT_S32_BE: wlen = AIC26_WLEN_32; break;
 163         default:
 164                 dev_dbg(&aic26->spi->dev, "bad format\n"); return -EINVAL;
 165         }
 166
 167         /* Configure PLL */
 168         pval = 1;
 169         jval = (fsref == 44100) ? 7 : 8;
 170         dval = (fsref == 44100) ? 5264 : 1920;
 171         qval = 0;
 172         reg = 0x8000 | qval << 11 | pval << 8 | jval << 2;
 173         aic26_reg_write(codec, AIC26_REG_PLL_PROG1, reg);
 174         reg = dval << 2;
 175         aic26_reg_write(codec, AIC26_REG_PLL_PROG2, reg);
 176
 177         /* Audio Control 3 (master mode, fsref rate) */
 178         reg = aic26_reg_read_cache(codec, AIC26_REG_AUDIO_CTRL3);
 179         reg &= ~0xf800;
 180         if (aic26->master)
 181                 reg |= 0x0800;
 182         if (fsref == 48000)
 183                 reg |= 0x2000;
 184         aic26_reg_write(codec, AIC26_REG_AUDIO_CTRL3, reg);
 185
 186         /* Audio Control 1 (FSref divisor) */
 187         reg = aic26_reg_read_cache(codec, AIC26_REG_AUDIO_CTRL1);
 188         reg &= ~0x0fff;
 189         reg |= wlen | aic26->datfm | (divisor << 3) | divisor;
 190         aic26_reg_write(codec, AIC26_REG_AUDIO_CTRL1, reg);
 191
 192         return 0;
 193 }
 194
 195 /**
 196  * aic26_mute - Mute control to reduce noise when changing audio format
 197  */
 198 static int aic26_mute(struct snd_soc_dai *dai, int mute)
 199 {
 200         struct snd_soc_codec *codec = dai->codec;
 201         struct aic26 *aic26 = codec->private_data;
 202         u16 reg = aic26_reg_read_cache(codec, AIC26_REG_DAC_GAIN);
 203
 204         dev_dbg(&aic26->spi->dev, "aic26_mute(dai=%p, mute=%i)\n",
 205                 dai, mute);
 206
 207         if (mute)
 208                 reg |= 0x8080;
 209         else
 210                 reg &= ~0x8080;
 211         aic26_reg_write(codec, AIC26_REG_DAC_GAIN, reg);
 212
 213         return 0;
 214 }
 215
 216 static int aic26_set_sysclk(struct snd_soc_dai *codec_dai,
 217                             int clk_id, unsigned int freq, int dir)
 218 {
 219         struct snd_soc_codec *codec = codec_dai->codec;
 220         struct aic26 *aic26 = codec->private_data;
 221
 222         dev_dbg(&aic26->spi->dev, "aic26_set_sysclk(dai=%p, clk_id==%i,"
 223                 " freq=%i, dir=%i)\n",
 224                 codec_dai, clk_id, freq, dir);
 225
 226         /* MCLK needs to fall between 2MHz and 50 MHz */
 227         if ((freq < 2000000) || (freq > 50000000))
 228                 return -EINVAL;
 229
 230         aic26->mclk = freq;
 231         return 0;
 232 }
 233
 234 static int aic26_set_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
 235 {
 236         struct snd_soc_codec *codec = codec_dai->codec;
 237         struct aic26 *aic26 = codec->private_data;
 238
 239         dev_dbg(&aic26->spi->dev, "aic26_set_fmt(dai=%p, fmt==%i)\n",
 240                 codec_dai, fmt);
 241
 242         /* set master/slave audio interface */
 243         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 244         case SND_SOC_DAIFMT_CBM_CFM: aic26->master = 1; break;
 245         case SND_SOC_DAIFMT_CBS_CFS: aic26->master = 0; break;
 246         default:
 247                 dev_dbg(&aic26->spi->dev, "bad master\n"); return -EINVAL;
 248         }
 249
 250         /* interface format */
 251         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 252         case SND_SOC_DAIFMT_I2S:     aic26->datfm = AIC26_DATFM_I2S; break;
 253         case SND_SOC_DAIFMT_DSP_A:   aic26->datfm = AIC26_DATFM_DSP; break;
 254         case SND_SOC_DAIFMT_RIGHT_J: aic26->datfm = AIC26_DATFM_RIGHTJ; break;
 255         case SND_SOC_DAIFMT_LEFT_J:  aic26->datfm = AIC26_DATFM_LEFTJ; break;
 256         default:
 257                 dev_dbg(&aic26->spi->dev, "bad format\n"); return -EINVAL;
 258         }
 259
 260         return 0;
 261 }
 262
 263 /* ---------------------------------------------------------------------
 264  * Digital Audio Interface Definition
 265  */
 266 #define AIC26_RATES     (SNDRV_PCM_RATE_8000  | SNDRV_PCM_RATE_11025 |\
 267                          SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 |\
 268                          SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\
 269                          SNDRV_PCM_RATE_48000)
 270 #define AIC26_FORMATS   (SNDRV_PCM_FMTBIT_S8     | SNDRV_PCM_FMTBIT_S16_BE |\
 271                          SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE)
 272
 273 static struct snd_soc_dai_ops aic26_dai_ops = {
 274         .hw_params      = aic26_hw_params,
 275         .digital_mute   = aic26_mute,
 276         .set_sysclk     = aic26_set_sysclk,
 277         .set_fmt        = aic26_set_fmt,
 278 };
 279
 280 struct snd_soc_dai aic26_dai = {
 281         .name = "tlv320aic26",
 282         .playback = {
 283                 .stream_name = "Playback",
 284                 .channels_min = 2,
 285                 .channels_max = 2,
 286                 .rates = AIC26_RATES,
 287                 .formats = AIC26_FORMATS,
 288         },
 289         .capture = {
 290                 .stream_name = "Capture",
 291                 .channels_min = 2,
 292                 .channels_max = 2,
 293                 .rates = AIC26_RATES,
 294                 .formats = AIC26_FORMATS,
 295         },
 296         .ops = &aic26_dai_ops,
 297 };
 298 EXPORT_SYMBOL_GPL(aic26_dai);
 299
 300 /* ---------------------------------------------------------------------
 301  * ALSA controls
 302  */
 303 static const char *aic26_capture_src_text[] = {"Mic", "Aux"};
 304 static const struct soc_enum aic26_capture_src_enum =
 305         SOC_ENUM_SINGLE(AIC26_REG_AUDIO_CTRL1, 12, 2, aic26_capture_src_text);
 306
 307 static const struct snd_kcontrol_new aic26_snd_controls[] = {
 308         /* Output */
 309         SOC_DOUBLE("PCM Playback Volume", AIC26_REG_DAC_GAIN, 8, 0, 0x7f, 1),
 310         SOC_DOUBLE("PCM Playback Switch", AIC26_REG_DAC_GAIN, 15, 7, 1, 1),
 311         SOC_SINGLE("PCM Capture Volume", AIC26_REG_ADC_GAIN, 8, 0x7f, 0),
 312         SOC_SINGLE("PCM Capture Mute", AIC26_REG_ADC_GAIN, 15, 1, 1),
 313         SOC_SINGLE("Keyclick activate", AIC26_REG_AUDIO_CTRL2, 15, 0x1, 0),
 314         SOC_SINGLE("Keyclick amplitude", AIC26_REG_AUDIO_CTRL2, 12, 0x7, 0),
 315         SOC_SINGLE("Keyclick frequency", AIC26_REG_AUDIO_CTRL2, 8, 0x7, 0),
 316         SOC_SINGLE("Keyclick period", AIC26_REG_AUDIO_CTRL2, 4, 0xf, 0),
 317         SOC_ENUM("Capture Source", aic26_capture_src_enum),
 318 };
 319
 320 /* ---------------------------------------------------------------------
 321  * SoC CODEC portion of driver: probe and release routines
 322  */
 323 static int aic26_probe(struct platform_device *pdev)
 324 {
 325         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 326         struct snd_soc_codec *codec;
 327         struct aic26 *aic26;
 328         int ret, err;
 329
 330         dev_info(&pdev->dev, "Probing AIC26 SoC CODEC driver\n");
 331         dev_dbg(&pdev->dev, "socdev=%p\n", socdev);
 332         dev_dbg(&pdev->dev, "codec_data=%p\n", socdev->codec_data);
 333
 334         /* Fetch the relevant aic26 private data here (it's already been
 335          * stored in the .codec pointer) */
 336         aic26 = socdev->codec_data;
 337         if (aic26 == NULL) {
 338                 dev_err(&pdev->dev, "aic26: missing codec pointer\n");
 339                 return -ENODEV;
 340         }
 341         codec = &aic26->codec;
 342         socdev->card->codec = codec;
 343
 344         dev_dbg(&pdev->dev, "Registering PCMs, dev=%p, socdev->dev=%p\n",
 345                 &pdev->dev, socdev->dev);
 346         /* register pcms */
 347         ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
 348         if (ret < 0) {
 349                 dev_err(&pdev->dev, "aic26: failed to create pcms\n");
 350                 return -ENODEV;
 351         }
 352
 353         /* register controls */
 354         dev_dbg(&pdev->dev, "Registering controls\n");
 355         err = snd_soc_add_controls(codec, aic26_snd_controls,
 356                         ARRAY_SIZE(aic26_snd_controls));
 357         WARN_ON(err < 0);
 358
 359         /* CODEC is setup, we can register the card now */
 360         dev_dbg(&pdev->dev, "Registering card\n");
 361         ret = snd_soc_init_card(socdev);
 362         if (ret < 0) {
 363                 dev_err(&pdev->dev, "aic26: failed to register card\n");
 364                 goto card_err;
 365         }
 366         return 0;
 367
 368  card_err:
 369         snd_soc_free_pcms(socdev);
 370         return ret;
 371 }
 372
 373 static int aic26_remove(struct platform_device *pdev)
 374 {
 375         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 376         snd_soc_free_pcms(socdev);
 377         return 0;
 378 }
 379
 380 struct snd_soc_codec_device aic26_soc_codec_dev = {
 381         .probe = aic26_probe,
 382         .remove = aic26_remove,
 383 };
 384 EXPORT_SYMBOL_GPL(aic26_soc_codec_dev);
 385
 386 /* ---------------------------------------------------------------------
 387  * SPI device portion of driver: sysfs files for debugging
 388  */
 389
 390 static ssize_t aic26_keyclick_show(struct device *dev,
 391                                    struct device_attribute *attr, char *buf)
 392 {
 393         struct aic26 *aic26 = dev_get_drvdata(dev);
 394         int val, amp, freq, len;
 395
 396         val = aic26_reg_read_cache(&aic26->codec, AIC26_REG_AUDIO_CTRL2);
 397         amp = (val >> 12) & 0x7;
 398         freq = (125 << ((val >> 8) & 0x7)) >> 1;
 399         len = 2 * (1 + ((val >> 4) & 0xf));
 400
 401         return sprintf(buf, "amp=%x freq=%iHz len=%iclks\n", amp, freq, len);
 402 }
 403
 404 /* Any write to the keyclick attribute will trigger the keyclick event */
 405 static ssize_t aic26_keyclick_set(struct device *dev,
 406                                   struct device_attribute *attr,
 407                                   const char *buf, size_t count)
 408 {
 409         struct aic26 *aic26 = dev_get_drvdata(dev);
 410         int val;
 411
 412         val = aic26_reg_read_cache(&aic26->codec, AIC26_REG_AUDIO_CTRL2);
 413         val |= 0x8000;
 414         aic26_reg_write(&aic26->codec, AIC26_REG_AUDIO_CTRL2, val);
 415
 416         return count;
 417 }
 418
 419 static DEVICE_ATTR(keyclick, 0644, aic26_keyclick_show, aic26_keyclick_set);
 420
 421 /* ---------------------------------------------------------------------
 422  * SPI device portion of driver: probe and release routines and SPI
 423  *                               driver registration.
 424  */
 425 static int aic26_spi_probe(struct spi_device *spi)
 426 {
 427         struct aic26 *aic26;
 428         int ret, i, reg;
 429
 430         dev_dbg(&spi->dev, "probing tlv320aic26 spi device\n");
 431
 432         /* Allocate driver data */
 433         aic26 = kzalloc(sizeof *aic26, GFP_KERNEL);
 434         if (!aic26)
 435                 return -ENOMEM;
 436
 437         /* Initialize the driver data */
 438         aic26->spi = spi;
 439         dev_set_drvdata(&spi->dev, aic26);
 440
 441         /* Setup what we can in the codec structure so that the register
 442          * access functions will work as expected.  More will be filled
 443          * out when it is probed by the SoC CODEC part of this driver */
 444         aic26->codec.private_data = aic26;
 445         aic26->codec.name = "aic26";
 446         aic26->codec.owner = THIS_MODULE;
 447         aic26->codec.dai = &aic26_dai;
 448         aic26->codec.num_dai = 1;
 449         aic26->codec.read = aic26_reg_read;
 450         aic26->codec.write = aic26_reg_write;
 451         aic26->master = 1;
 452         mutex_init(&aic26->codec.mutex);
 453         INIT_LIST_HEAD(&aic26->codec.dapm_widgets);
 454         INIT_LIST_HEAD(&aic26->codec.dapm_paths);
 455         aic26->codec.reg_cache_size = AIC26_NUM_REGS;
 456         aic26->codec.reg_cache = aic26->reg_cache;
 457
 458         aic26_dai.dev = &spi->dev;
 459         ret = snd_soc_register_dai(&aic26_dai);
 460         if (ret != 0) {
 461                 dev_err(&spi->dev, "Failed to register DAI: %d\n", ret);
 462                 kfree(aic26);
 463                 return ret;
 464         }
 465
 466         /* Reset the codec to power on defaults */
 467         aic26_reg_write(&aic26->codec, AIC26_REG_RESET, 0xBB00);
 468
 469         /* Power up CODEC */
 470         aic26_reg_write(&aic26->codec, AIC26_REG_POWER_CTRL, 0);
 471
 472         /* Audio Control 3 (master mode, fsref rate) */
 473         reg = aic26_reg_read(&aic26->codec, AIC26_REG_AUDIO_CTRL3);
 474         reg &= ~0xf800;
 475         reg |= 0x0800; /* set master mode */
 476         aic26_reg_write(&aic26->codec, AIC26_REG_AUDIO_CTRL3, reg);
 477
 478         /* Fill register cache */
 479         for (i = 0; i < ARRAY_SIZE(aic26->reg_cache); i++)
 480                 aic26_reg_read(&aic26->codec, i);
 481
 482         /* Register the sysfs files for debugging */
 483         /* Create SysFS files */
 484         ret = device_create_file(&spi->dev, &dev_attr_keyclick);
 485         if (ret)
 486                 dev_info(&spi->dev, "error creating sysfs files\n");
 487
 488 #if defined(CONFIG_SND_SOC_OF_SIMPLE)
 489         /* Tell the of_soc helper about this codec */
 490         of_snd_soc_register_codec(&aic26_soc_codec_dev, aic26, &aic26_dai,
 491                                   spi->dev.archdata.of_node);
 492 #endif
 493
 494         dev_dbg(&spi->dev, "SPI device initialized\n");
 495         return 0;
 496 }
 497
 498 static int aic26_spi_remove(struct spi_device *spi)
 499 {
 500         struct aic26 *aic26 = dev_get_drvdata(&spi->dev);
 501
 502         snd_soc_unregister_dai(&aic26_dai);
 503         kfree(aic26);
 504
 505         return 0;
 506 }
 507
 508 static struct spi_driver aic26_spi = {
 509         .driver = {
 510                 .name = "tlv320aic26",
 511                 .owner = THIS_MODULE,
 512         },
 513         .probe = aic26_spi_probe,
 514         .remove = aic26_spi_remove,
 515 };
 516
 517 static int __init aic26_init(void)
 518 {
 519         return spi_register_driver(&aic26_spi);
 520 }
 521 module_init(aic26_init);
 522
 523 static void __exit aic26_exit(void)
 524 {
 525         spi_unregister_driver(&aic26_spi);
 526 }
 527 module_exit(aic26_exit);