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 <linux/slab.h>
  17 #include <sound/core.h>
  18 #include <sound/pcm.h>
  19 #include <sound/pcm_params.h>
  20 #include <sound/soc.h>
  21 #include <sound/initval.h>
  22
  23 #include "tlv320aic26.h"
  24
  25 MODULE_DESCRIPTION("ASoC TLV320AIC26 codec driver");
  26 MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
  27 MODULE_LICENSE("GPL");
  28
  29 /* AIC26 driver private data */
  30 struct aic26 {
  31         struct spi_device *spi;
  32         struct snd_soc_codec codec;
  33         int master;
  34         int datfm;
  35         int mclk;
  36
  37         /* Keyclick parameters */
  38         int keyclick_amplitude;
  39         int keyclick_freq;
  40         int keyclick_len;
  41 };
  42
  43 /* ---------------------------------------------------------------------
  44  * Register access routines
  45  */
  46 static unsigned int aic26_reg_read(struct snd_soc_codec *codec,
  47                                    unsigned int reg)
  48 {
  49         struct aic26 *aic26 = snd_soc_codec_get_drvdata(codec);
  50         u16 *cache = codec->reg_cache;
  51         u16 cmd, value;
  52         u8 buffer[2];
  53         int rc;
  54
  55         if (reg >= AIC26_NUM_REGS) {
  56                 WARN_ON_ONCE(1);
  57                 return 0;
  58         }
  59
  60         /* Do SPI transfer; first 16bits are command; remaining is
  61          * register contents */
  62         cmd = AIC26_READ_COMMAND_WORD(reg);
  63         buffer[0] = (cmd >> 8) & 0xff;
  64         buffer[1] = cmd & 0xff;
  65         rc = spi_write_then_read(aic26->spi, buffer, 2, buffer, 2);
  66         if (rc) {
  67                 dev_err(&aic26->spi->dev, "AIC26 reg read error\n");
  68                 return -EIO;
  69         }
  70         value = (buffer[0] << 8) | buffer[1];
  71
  72         /* Update the cache before returning with the value */
  73         cache[reg] = value;
  74         return value;
  75 }
  76
  77 static unsigned int aic26_reg_read_cache(struct snd_soc_codec *codec,
  78                                          unsigned int reg)
  79 {
  80         u16 *cache = codec->reg_cache;
  81
  82         if (reg >= AIC26_NUM_REGS) {
  83                 WARN_ON_ONCE(1);
  84                 return 0;
  85         }
  86
  87         return cache[reg];
  88 }
  89
  90 static int aic26_reg_write(struct snd_soc_codec *codec, unsigned int reg,
  91                            unsigned int value)
  92 {
  93         struct aic26 *aic26 = snd_soc_codec_get_drvdata(codec);
  94         u16 *cache = codec->reg_cache;
  95         u16 cmd;
  96         u8 buffer[4];
  97         int rc;
  98
  99         if (reg >= AIC26_NUM_REGS) {
 100                 WARN_ON_ONCE(1);
 101                 return -EINVAL;
 102         }
 103
 104         /* Do SPI transfer; first 16bits are command; remaining is data
 105          * to write into register */
 106         cmd = AIC26_WRITE_COMMAND_WORD(reg);
 107         buffer[0] = (cmd >> 8) & 0xff;
 108         buffer[1] = cmd & 0xff;
 109         buffer[2] = value >> 8;
 110         buffer[3] = value;
 111         rc = spi_write(aic26->spi, buffer, 4);
 112         if (rc) {
 113                 dev_err(&aic26->spi->dev, "AIC26 reg read error\n");
 114                 return -EIO;
 115         }
 116
 117         /* update cache before returning */
 118         cache[reg] = value;
 119         return 0;
 120 }
 121
 122 /* ---------------------------------------------------------------------
 123  * Digital Audio Interface Operations
 124  */
 125 static int aic26_hw_params(struct snd_pcm_substream *substream,
 126                            struct snd_pcm_hw_params *params,
 127                            struct snd_soc_dai *dai)
 128 {
 129         struct snd_soc_codec *codec = dai->codec;
 130         struct aic26 *aic26 = snd_soc_codec_get_drvdata(codec);
 131         int fsref, divisor, wlen, pval, jval, dval, qval;
 132         u16 reg;
 133
 134         dev_dbg(&aic26->spi->dev, "aic26_hw_params(substream=%p, params=%p)\n",
 135                 substream, params);
 136         dev_dbg(&aic26->spi->dev, "rate=%i format=%i\n", params_rate(params),
 137                 params_format(params));
 138
 139         switch (params_rate(params)) {
 140         case 8000:  fsref = 48000; divisor = AIC26_DIV_6; break;
 141         case 11025: fsref = 44100; divisor = AIC26_DIV_4; break;
 142         case 12000: fsref = 48000; divisor = AIC26_DIV_4; break;
 143         case 16000: fsref = 48000; divisor = AIC26_DIV_3; break;
 144         case 22050: fsref = 44100; divisor = AIC26_DIV_2; break;
 145         case 24000: fsref = 48000; divisor = AIC26_DIV_2; break;
 146         case 32000: fsref = 48000; divisor = AIC26_DIV_1_5; break;
 147         case 44100: fsref = 44100; divisor = AIC26_DIV_1; break;
 148         case 48000: fsref = 48000; divisor = AIC26_DIV_1; break;
 149         default:
 150                 dev_dbg(&aic26->spi->dev, "bad rate\n"); return -EINVAL;
 151         }
 152
 153         /* select data word length */
 154         switch (params_format(params)) {
 155         case SNDRV_PCM_FORMAT_S8:     wlen = AIC26_WLEN_16; break;
 156         case SNDRV_PCM_FORMAT_S16_BE: wlen = AIC26_WLEN_16; break;
 157         case SNDRV_PCM_FORMAT_S24_BE: wlen = AIC26_WLEN_24; break;
 158         case SNDRV_PCM_FORMAT_S32_BE: wlen = AIC26_WLEN_32; break;
 159         default:
 160                 dev_dbg(&aic26->spi->dev, "bad format\n"); return -EINVAL;
 161         }
 162
 163         /**
 164          * Configure PLL
 165          * fsref = (mclk * PLLM) / 2048
 166          * where PLLM = J.DDDD (DDDD register ranges from 0 to 9999, decimal)
 167          */
 168         pval = 1;
 169         /* compute J portion of multiplier */
 170         jval = fsref / (aic26->mclk / 2048);
 171         /* compute fractional DDDD component of multiplier */
 172         dval = fsref - (jval * (aic26->mclk / 2048));
 173         dval = (10000 * dval) / (aic26->mclk / 2048);
 174         dev_dbg(&aic26->spi->dev, "Setting PLLM to %d.%04d\n", jval, dval);
 175         qval = 0;
 176         reg = 0x8000 | qval << 11 | pval << 8 | jval << 2;
 177         aic26_reg_write(codec, AIC26_REG_PLL_PROG1, reg);
 178         reg = dval << 2;
 179         aic26_reg_write(codec, AIC26_REG_PLL_PROG2, reg);
 180
 181         /* Audio Control 3 (master mode, fsref rate) */
 182         reg = aic26_reg_read_cache(codec, AIC26_REG_AUDIO_CTRL3);
 183         reg &= ~0xf800;
 184         if (aic26->master)
 185                 reg |= 0x0800;
 186         if (fsref == 48000)
 187                 reg |= 0x2000;
 188         aic26_reg_write(codec, AIC26_REG_AUDIO_CTRL3, reg);
 189
 190         /* Audio Control 1 (FSref divisor) */
 191         reg = aic26_reg_read_cache(codec, AIC26_REG_AUDIO_CTRL1);
 192         reg &= ~0x0fff;
 193         reg |= wlen | aic26->datfm | (divisor << 3) | divisor;
 194         aic26_reg_write(codec, AIC26_REG_AUDIO_CTRL1, reg);
 195
 196         return 0;
 197 }
 198
 199 /**
 200  * aic26_mute - Mute control to reduce noise when changing audio format
 201  */
 202 static int aic26_mute(struct snd_soc_dai *dai, int mute)
 203 {
 204         struct snd_soc_codec *codec = dai->codec;
 205         struct aic26 *aic26 = snd_soc_codec_get_drvdata(codec);
 206         u16 reg = aic26_reg_read_cache(codec, AIC26_REG_DAC_GAIN);
 207
 208         dev_dbg(&aic26->spi->dev, "aic26_mute(dai=%p, mute=%i)\n",
 209                 dai, mute);
 210
 211         if (mute)
 212                 reg |= 0x8080;
 213         else
 214                 reg &= ~0x8080;
 215         aic26_reg_write(codec, AIC26_REG_DAC_GAIN, reg);
 216
 217         return 0;
 218 }
 219
 220 static int aic26_set_sysclk(struct snd_soc_dai *codec_dai,
 221                             int clk_id, unsigned int freq, int dir)
 222 {
 223         struct snd_soc_codec *codec = codec_dai->codec;
 224         struct aic26 *aic26 = snd_soc_codec_get_drvdata(codec);
 225
 226         dev_dbg(&aic26->spi->dev, "aic26_set_sysclk(dai=%p, clk_id==%i,"
 227                 " freq=%i, dir=%i)\n",
 228                 codec_dai, clk_id, freq, dir);
 229
 230         /* MCLK needs to fall between 2MHz and 50 MHz */
 231         if ((freq < 2000000) || (freq > 50000000))
 232                 return -EINVAL;
 233
 234         aic26->mclk = freq;
 235         return 0;
 236 }
 237
 238 static int aic26_set_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
 239 {
 240         struct snd_soc_codec *codec = codec_dai->codec;
 241         struct aic26 *aic26 = snd_soc_codec_get_drvdata(codec);
 242
 243         dev_dbg(&aic26->spi->dev, "aic26_set_fmt(dai=%p, fmt==%i)\n",
 244                 codec_dai, fmt);
 245
 246         /* set master/slave audio interface */
 247         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 248         case SND_SOC_DAIFMT_CBM_CFM: aic26->master = 1; break;
 249         case SND_SOC_DAIFMT_CBS_CFS: aic26->master = 0; break;
 250         default:
 251                 dev_dbg(&aic26->spi->dev, "bad master\n"); return -EINVAL;
 252         }
 253
 254         /* interface format */
 255         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 256         case SND_SOC_DAIFMT_I2S:     aic26->datfm = AIC26_DATFM_I2S; break;
 257         case SND_SOC_DAIFMT_DSP_A:   aic26->datfm = AIC26_DATFM_DSP; break;
 258         case SND_SOC_DAIFMT_RIGHT_J: aic26->datfm = AIC26_DATFM_RIGHTJ; break;
 259         case SND_SOC_DAIFMT_LEFT_J:  aic26->datfm = AIC26_DATFM_LEFTJ; break;
 260         default:
 261                 dev_dbg(&aic26->spi->dev, "bad format\n"); return -EINVAL;
 262         }
 263
 264         return 0;
 265 }
 266
 267 /* ---------------------------------------------------------------------
 268  * Digital Audio Interface Definition
 269  */
 270 #define AIC26_RATES     (SNDRV_PCM_RATE_8000  | SNDRV_PCM_RATE_11025 |\
 271                          SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 |\
 272                          SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\
 273                          SNDRV_PCM_RATE_48000)
 274 #define AIC26_FORMATS   (SNDRV_PCM_FMTBIT_S8     | SNDRV_PCM_FMTBIT_S16_BE |\
 275                          SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE)
 276
 277 static const struct snd_soc_dai_ops aic26_dai_ops = {
 278         .hw_params      = aic26_hw_params,
 279         .digital_mute   = aic26_mute,
 280         .set_sysclk     = aic26_set_sysclk,
 281         .set_fmt        = aic26_set_fmt,
 282 };
 283
 284 static struct snd_soc_dai_driver aic26_dai = {
 285         .name = "tlv320aic26-hifi",
 286         .playback = {
 287                 .stream_name = "Playback",
 288                 .channels_min = 2,
 289                 .channels_max = 2,
 290                 .rates = AIC26_RATES,
 291                 .formats = AIC26_FORMATS,
 292         },
 293         .capture = {
 294                 .stream_name = "Capture",
 295                 .channels_min = 2,
 296                 .channels_max = 2,
 297                 .rates = AIC26_RATES,
 298                 .formats = AIC26_FORMATS,
 299         },
 300         .ops = &aic26_dai_ops,
 301 };
 302
 303 /* ---------------------------------------------------------------------
 304  * ALSA controls
 305  */
 306 static const char *aic26_capture_src_text[] = {"Mic", "Aux"};
 307 static const struct soc_enum aic26_capture_src_enum =
 308         SOC_ENUM_SINGLE(AIC26_REG_AUDIO_CTRL1, 12, 2, aic26_capture_src_text);
 309
 310 static const struct snd_kcontrol_new aic26_snd_controls[] = {
 311         /* Output */
 312         SOC_DOUBLE("PCM Playback Volume", AIC26_REG_DAC_GAIN, 8, 0, 0x7f, 1),
 313         SOC_DOUBLE("PCM Playback Switch", AIC26_REG_DAC_GAIN, 15, 7, 1, 1),
 314         SOC_SINGLE("PCM Capture Volume", AIC26_REG_ADC_GAIN, 8, 0x7f, 0),
 315         SOC_SINGLE("PCM Capture Mute", AIC26_REG_ADC_GAIN, 15, 1, 1),
 316         SOC_SINGLE("Keyclick activate", AIC26_REG_AUDIO_CTRL2, 15, 0x1, 0),
 317         SOC_SINGLE("Keyclick amplitude", AIC26_REG_AUDIO_CTRL2, 12, 0x7, 0),
 318         SOC_SINGLE("Keyclick frequency", AIC26_REG_AUDIO_CTRL2, 8, 0x7, 0),
 319         SOC_SINGLE("Keyclick period", AIC26_REG_AUDIO_CTRL2, 4, 0xf, 0),
 320         SOC_ENUM("Capture Source", aic26_capture_src_enum),
 321 };
 322
 323 /* ---------------------------------------------------------------------
 324  * SPI device portion of driver: sysfs files for debugging
 325  */
 326
 327 static ssize_t aic26_keyclick_show(struct device *dev,
 328                                    struct device_attribute *attr, char *buf)
 329 {
 330         struct aic26 *aic26 = dev_get_drvdata(dev);
 331         int val, amp, freq, len;
 332
 333         val = aic26_reg_read_cache(&aic26->codec, AIC26_REG_AUDIO_CTRL2);
 334         amp = (val >> 12) & 0x7;
 335         freq = (125 << ((val >> 8) & 0x7)) >> 1;
 336         len = 2 * (1 + ((val >> 4) & 0xf));
 337
 338         return sprintf(buf, "amp=%x freq=%iHz len=%iclks\n", amp, freq, len);
 339 }
 340
 341 /* Any write to the keyclick attribute will trigger the keyclick event */
 342 static ssize_t aic26_keyclick_set(struct device *dev,
 343                                   struct device_attribute *attr,
 344                                   const char *buf, size_t count)
 345 {
 346         struct aic26 *aic26 = dev_get_drvdata(dev);
 347         int val;
 348
 349         val = aic26_reg_read_cache(&aic26->codec, AIC26_REG_AUDIO_CTRL2);
 350         val |= 0x8000;
 351         aic26_reg_write(&aic26->codec, AIC26_REG_AUDIO_CTRL2, val);
 352
 353         return count;
 354 }
 355
 356 static DEVICE_ATTR(keyclick, 0644, aic26_keyclick_show, aic26_keyclick_set);
 357
 358 /* ---------------------------------------------------------------------
 359  * SoC CODEC portion of driver: probe and release routines
 360  */
 361 static int aic26_probe(struct snd_soc_codec *codec)
 362 {
 363         int ret, err, i, reg;
 364
 365         dev_info(codec->dev, "Probing AIC26 SoC CODEC driver\n");
 366
 367         /* Reset the codec to power on defaults */
 368         aic26_reg_write(codec, AIC26_REG_RESET, 0xBB00);
 369
 370         /* Power up CODEC */
 371         aic26_reg_write(codec, AIC26_REG_POWER_CTRL, 0);
 372
 373         /* Audio Control 3 (master mode, fsref rate) */
 374         reg = aic26_reg_read(codec, AIC26_REG_AUDIO_CTRL3);
 375         reg &= ~0xf800;
 376         reg |= 0x0800; /* set master mode */
 377         aic26_reg_write(codec, AIC26_REG_AUDIO_CTRL3, reg);
 378
 379         /* Fill register cache */
 380         for (i = 0; i < codec->driver->reg_cache_size; i++)
 381                 aic26_reg_read(codec, i);
 382
 383         /* Register the sysfs files for debugging */
 384         /* Create SysFS files */
 385         ret = device_create_file(codec->dev, &dev_attr_keyclick);
 386         if (ret)
 387                 dev_info(codec->dev, "error creating sysfs files\n");
 388
 389         /* register controls */
 390         dev_dbg(codec->dev, "Registering controls\n");
 391         err = snd_soc_add_codec_controls(codec, aic26_snd_controls,
 392                         ARRAY_SIZE(aic26_snd_controls));
 393         WARN_ON(err < 0);
 394
 395         return 0;
 396 }
 397
 398 static struct snd_soc_codec_driver aic26_soc_codec_dev = {
 399         .probe = aic26_probe,
 400         .read = aic26_reg_read,
 401         .write = aic26_reg_write,
 402         .reg_cache_size = AIC26_NUM_REGS,
 403         .reg_word_size = sizeof(u16),
 404 };
 405
 406 /* ---------------------------------------------------------------------
 407  * SPI device portion of driver: probe and release routines and SPI
 408  *                               driver registration.
 409  */
 410 static int aic26_spi_probe(struct spi_device *spi)
 411 {
 412         struct aic26 *aic26;
 413         int ret;
 414
 415         dev_dbg(&spi->dev, "probing tlv320aic26 spi device\n");
 416
 417         /* Allocate driver data */
 418         aic26 = devm_kzalloc(&spi->dev, sizeof *aic26, GFP_KERNEL);
 419         if (!aic26)
 420                 return -ENOMEM;
 421
 422         /* Initialize the driver data */
 423         aic26->spi = spi;
 424         dev_set_drvdata(&spi->dev, aic26);
 425         aic26->master = 1;
 426
 427         ret = snd_soc_register_codec(&spi->dev,
 428                         &aic26_soc_codec_dev, &aic26_dai, 1);
 429         return ret;
 430 }
 431
 432 static int aic26_spi_remove(struct spi_device *spi)
 433 {
 434         snd_soc_unregister_codec(&spi->dev);
 435         return 0;
 436 }
 437
 438 static struct spi_driver aic26_spi = {
 439         .driver = {
 440                 .name = "tlv320aic26-codec",
 441                 .owner = THIS_MODULE,
 442         },
 443         .probe = aic26_spi_probe,
 444         .remove = aic26_spi_remove,
 445 };
 446
 447 static int __init aic26_init(void)
 448 {
 449         return spi_register_driver(&aic26_spi);
 450 }
 451 module_init(aic26_init);
 452
 453 static void __exit aic26_exit(void)
 454 {
 455         spi_unregister_driver(&aic26_spi);
 456 }
 457 module_exit(aic26_exit);