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 regmap *regmap;
  33         struct snd_soc_codec *codec;
  34         int master;
  35         int datfm;
  36         int mclk;
  37
  38         /* Keyclick parameters */
  39         int keyclick_amplitude;
  40         int keyclick_freq;
  41         int keyclick_len;
  42 };
  43
  44 static const struct snd_soc_dapm_widget tlv320aic26_dapm_widgets[] = {
  45 SND_SOC_DAPM_INPUT("MICIN"),
  46 SND_SOC_DAPM_INPUT("AUX"),
  47
  48 SND_SOC_DAPM_OUTPUT("HPL"),
  49 SND_SOC_DAPM_OUTPUT("HPR"),
  50 };
  51
  52 static const struct snd_soc_dapm_route tlv320aic26_dapm_routes[] = {
  53         { "Capture", NULL, "MICIN" },
  54         { "Capture", NULL, "AUX" },
  55
  56         { "HPL", NULL, "Playback" },
  57         { "HPR", NULL, "Playback" },
  58 };
  59
  60 /* ---------------------------------------------------------------------
  61  * Digital Audio Interface Operations
  62  */
  63 static int aic26_hw_params(struct snd_pcm_substream *substream,
  64                            struct snd_pcm_hw_params *params,
  65                            struct snd_soc_dai *dai)
  66 {
  67         struct snd_soc_codec *codec = dai->codec;
  68         struct aic26 *aic26 = snd_soc_codec_get_drvdata(codec);
  69         int fsref, divisor, wlen, pval, jval, dval, qval;
  70         u16 reg;
  71
  72         dev_dbg(&aic26->spi->dev, "aic26_hw_params(substream=%p, params=%p)\n",
  73                 substream, params);
  74         dev_dbg(&aic26->spi->dev, "rate=%i width=%d\n", params_rate(params),
  75                 params_width(params));
  76
  77         switch (params_rate(params)) {
  78         case 8000:  fsref = 48000; divisor = AIC26_DIV_6; break;
  79         case 11025: fsref = 44100; divisor = AIC26_DIV_4; break;
  80         case 12000: fsref = 48000; divisor = AIC26_DIV_4; break;
  81         case 16000: fsref = 48000; divisor = AIC26_DIV_3; break;
  82         case 22050: fsref = 44100; divisor = AIC26_DIV_2; break;
  83         case 24000: fsref = 48000; divisor = AIC26_DIV_2; break;
  84         case 32000: fsref = 48000; divisor = AIC26_DIV_1_5; break;
  85         case 44100: fsref = 44100; divisor = AIC26_DIV_1; break;
  86         case 48000: fsref = 48000; divisor = AIC26_DIV_1; break;
  87         default:
  88                 dev_dbg(&aic26->spi->dev, "bad rate\n"); return -EINVAL;
  89         }
  90
  91         /* select data word length */
  92         switch (params_width(params)) {
  93         case 8:  wlen = AIC26_WLEN_16; break;
  94         case 16: wlen = AIC26_WLEN_16; break;
  95         case 24: wlen = AIC26_WLEN_24; break;
  96         case 32: wlen = AIC26_WLEN_32; break;
  97         default:
  98                 dev_dbg(&aic26->spi->dev, "bad format\n"); return -EINVAL;
  99         }
 100
 101         /**
 102          * Configure PLL
 103          * fsref = (mclk * PLLM) / 2048
 104          * where PLLM = J.DDDD (DDDD register ranges from 0 to 9999, decimal)
 105          */
 106         pval = 1;
 107         /* compute J portion of multiplier */
 108         jval = fsref / (aic26->mclk / 2048);
 109         /* compute fractional DDDD component of multiplier */
 110         dval = fsref - (jval * (aic26->mclk / 2048));
 111         dval = (10000 * dval) / (aic26->mclk / 2048);
 112         dev_dbg(&aic26->spi->dev, "Setting PLLM to %d.%04d\n", jval, dval);
 113         qval = 0;
 114         reg = 0x8000 | qval << 11 | pval << 8 | jval << 2;
 115         snd_soc_write(codec, AIC26_REG_PLL_PROG1, reg);
 116         reg = dval << 2;
 117         snd_soc_write(codec, AIC26_REG_PLL_PROG2, reg);
 118
 119         /* Audio Control 3 (master mode, fsref rate) */
 120         if (aic26->master)
 121                 reg = 0x0800;
 122         if (fsref == 48000)
 123                 reg = 0x2000;
 124         snd_soc_update_bits(codec, AIC26_REG_AUDIO_CTRL3, 0xf800, reg);
 125
 126         /* Audio Control 1 (FSref divisor) */
 127         reg = wlen | aic26->datfm | (divisor << 3) | divisor;
 128         snd_soc_update_bits(codec, AIC26_REG_AUDIO_CTRL1, 0xfff, reg);
 129
 130         return 0;
 131 }
 132
 133 /**
 134  * aic26_mute - Mute control to reduce noise when changing audio format
 135  */
 136 static int aic26_mute(struct snd_soc_dai *dai, int mute)
 137 {
 138         struct snd_soc_codec *codec = dai->codec;
 139         struct aic26 *aic26 = snd_soc_codec_get_drvdata(codec);
 140         u16 reg;
 141
 142         dev_dbg(&aic26->spi->dev, "aic26_mute(dai=%p, mute=%i)\n",
 143                 dai, mute);
 144
 145         if (mute)
 146                 reg = 0x8080;
 147         else
 148                 reg = 0;
 149         snd_soc_update_bits(codec, AIC26_REG_DAC_GAIN, 0x8000, reg);
 150
 151         return 0;
 152 }
 153
 154 static int aic26_set_sysclk(struct snd_soc_dai *codec_dai,
 155                             int clk_id, unsigned int freq, int dir)
 156 {
 157         struct snd_soc_codec *codec = codec_dai->codec;
 158         struct aic26 *aic26 = snd_soc_codec_get_drvdata(codec);
 159
 160         dev_dbg(&aic26->spi->dev, "aic26_set_sysclk(dai=%p, clk_id==%i,"
 161                 " freq=%i, dir=%i)\n",
 162                 codec_dai, clk_id, freq, dir);
 163
 164         /* MCLK needs to fall between 2MHz and 50 MHz */
 165         if ((freq < 2000000) || (freq > 50000000))
 166                 return -EINVAL;
 167
 168         aic26->mclk = freq;
 169         return 0;
 170 }
 171
 172 static int aic26_set_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
 173 {
 174         struct snd_soc_codec *codec = codec_dai->codec;
 175         struct aic26 *aic26 = snd_soc_codec_get_drvdata(codec);
 176
 177         dev_dbg(&aic26->spi->dev, "aic26_set_fmt(dai=%p, fmt==%i)\n",
 178                 codec_dai, fmt);
 179
 180         /* set master/slave audio interface */
 181         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 182         case SND_SOC_DAIFMT_CBM_CFM: aic26->master = 1; break;
 183         case SND_SOC_DAIFMT_CBS_CFS: aic26->master = 0; break;
 184         default:
 185                 dev_dbg(&aic26->spi->dev, "bad master\n"); return -EINVAL;
 186         }
 187
 188         /* interface format */
 189         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 190         case SND_SOC_DAIFMT_I2S:     aic26->datfm = AIC26_DATFM_I2S; break;
 191         case SND_SOC_DAIFMT_DSP_A:   aic26->datfm = AIC26_DATFM_DSP; break;
 192         case SND_SOC_DAIFMT_RIGHT_J: aic26->datfm = AIC26_DATFM_RIGHTJ; break;
 193         case SND_SOC_DAIFMT_LEFT_J:  aic26->datfm = AIC26_DATFM_LEFTJ; break;
 194         default:
 195                 dev_dbg(&aic26->spi->dev, "bad format\n"); return -EINVAL;
 196         }
 197
 198         return 0;
 199 }
 200
 201 /* ---------------------------------------------------------------------
 202  * Digital Audio Interface Definition
 203  */
 204 #define AIC26_RATES     (SNDRV_PCM_RATE_8000  | SNDRV_PCM_RATE_11025 |\
 205                          SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 |\
 206                          SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\
 207                          SNDRV_PCM_RATE_48000)
 208 #define AIC26_FORMATS   (SNDRV_PCM_FMTBIT_S8     | SNDRV_PCM_FMTBIT_S16_BE |\
 209                          SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE)
 210
 211 static const struct snd_soc_dai_ops aic26_dai_ops = {
 212         .hw_params      = aic26_hw_params,
 213         .digital_mute   = aic26_mute,
 214         .set_sysclk     = aic26_set_sysclk,
 215         .set_fmt        = aic26_set_fmt,
 216 };
 217
 218 static struct snd_soc_dai_driver aic26_dai = {
 219         .name = "tlv320aic26-hifi",
 220         .playback = {
 221                 .stream_name = "Playback",
 222                 .channels_min = 2,
 223                 .channels_max = 2,
 224                 .rates = AIC26_RATES,
 225                 .formats = AIC26_FORMATS,
 226         },
 227         .capture = {
 228                 .stream_name = "Capture",
 229                 .channels_min = 2,
 230                 .channels_max = 2,
 231                 .rates = AIC26_RATES,
 232                 .formats = AIC26_FORMATS,
 233         },
 234         .ops = &aic26_dai_ops,
 235 };
 236
 237 /* ---------------------------------------------------------------------
 238  * ALSA controls
 239  */
 240 static const char *aic26_capture_src_text[] = {"Mic", "Aux"};
 241 static SOC_ENUM_SINGLE_DECL(aic26_capture_src_enum,
 242                             AIC26_REG_AUDIO_CTRL1, 12,
 243                             aic26_capture_src_text);
 244
 245 static const struct snd_kcontrol_new aic26_snd_controls[] = {
 246         /* Output */
 247         SOC_DOUBLE("PCM Playback Volume", AIC26_REG_DAC_GAIN, 8, 0, 0x7f, 1),
 248         SOC_DOUBLE("PCM Playback Switch", AIC26_REG_DAC_GAIN, 15, 7, 1, 1),
 249         SOC_SINGLE("PCM Capture Volume", AIC26_REG_ADC_GAIN, 8, 0x7f, 0),
 250         SOC_SINGLE("PCM Capture Mute", AIC26_REG_ADC_GAIN, 15, 1, 1),
 251         SOC_SINGLE("Keyclick activate", AIC26_REG_AUDIO_CTRL2, 15, 0x1, 0),
 252         SOC_SINGLE("Keyclick amplitude", AIC26_REG_AUDIO_CTRL2, 12, 0x7, 0),
 253         SOC_SINGLE("Keyclick frequency", AIC26_REG_AUDIO_CTRL2, 8, 0x7, 0),
 254         SOC_SINGLE("Keyclick period", AIC26_REG_AUDIO_CTRL2, 4, 0xf, 0),
 255         SOC_ENUM("Capture Source", aic26_capture_src_enum),
 256 };
 257
 258 /* ---------------------------------------------------------------------
 259  * SPI device portion of driver: sysfs files for debugging
 260  */
 261
 262 static ssize_t aic26_keyclick_show(struct device *dev,
 263                                    struct device_attribute *attr, char *buf)
 264 {
 265         struct aic26 *aic26 = dev_get_drvdata(dev);
 266         int val, amp, freq, len;
 267
 268         val = snd_soc_read(aic26->codec, AIC26_REG_AUDIO_CTRL2);
 269         amp = (val >> 12) & 0x7;
 270         freq = (125 << ((val >> 8) & 0x7)) >> 1;
 271         len = 2 * (1 + ((val >> 4) & 0xf));
 272
 273         return sprintf(buf, "amp=%x freq=%iHz len=%iclks\n", amp, freq, len);
 274 }
 275
 276 /* Any write to the keyclick attribute will trigger the keyclick event */
 277 static ssize_t aic26_keyclick_set(struct device *dev,
 278                                   struct device_attribute *attr,
 279                                   const char *buf, size_t count)
 280 {
 281         struct aic26 *aic26 = dev_get_drvdata(dev);
 282
 283         snd_soc_update_bits(aic26->codec, AIC26_REG_AUDIO_CTRL2,
 284                             0x8000, 0x800);
 285
 286         return count;
 287 }
 288
 289 static DEVICE_ATTR(keyclick, 0644, aic26_keyclick_show, aic26_keyclick_set);
 290
 291 /* ---------------------------------------------------------------------
 292  * SoC CODEC portion of driver: probe and release routines
 293  */
 294 static int aic26_probe(struct snd_soc_codec *codec)
 295 {
 296         struct aic26 *aic26 = dev_get_drvdata(codec->dev);
 297         int ret, reg;
 298
 299         aic26->codec = codec;
 300
 301         /* Reset the codec to power on defaults */
 302         snd_soc_write(codec, AIC26_REG_RESET, 0xBB00);
 303
 304         /* Power up CODEC */
 305         snd_soc_write(codec, AIC26_REG_POWER_CTRL, 0);
 306
 307         /* Audio Control 3 (master mode, fsref rate) */
 308         reg = snd_soc_read(codec, AIC26_REG_AUDIO_CTRL3);
 309         reg &= ~0xf800;
 310         reg |= 0x0800; /* set master mode */
 311         snd_soc_write(codec, AIC26_REG_AUDIO_CTRL3, reg);
 312
 313         /* Register the sysfs files for debugging */
 314         /* Create SysFS files */
 315         ret = device_create_file(codec->dev, &dev_attr_keyclick);
 316         if (ret)
 317                 dev_info(codec->dev, "error creating sysfs files\n");
 318
 319         return 0;
 320 }
 321
 322 static struct snd_soc_codec_driver aic26_soc_codec_dev = {
 323         .probe = aic26_probe,
 324         .controls = aic26_snd_controls,
 325         .num_controls = ARRAY_SIZE(aic26_snd_controls),
 326         .dapm_widgets = tlv320aic26_dapm_widgets,
 327         .num_dapm_widgets = ARRAY_SIZE(tlv320aic26_dapm_widgets),
 328         .dapm_routes = tlv320aic26_dapm_routes,
 329         .num_dapm_routes = ARRAY_SIZE(tlv320aic26_dapm_routes),
 330 };
 331
 332 static const struct regmap_config aic26_regmap = {
 333         .reg_bits = 16,
 334         .val_bits = 16,
 335 };
 336
 337 /* ---------------------------------------------------------------------
 338  * SPI device portion of driver: probe and release routines and SPI
 339  *                               driver registration.
 340  */
 341 static int aic26_spi_probe(struct spi_device *spi)
 342 {
 343         struct aic26 *aic26;
 344         int ret;
 345
 346         dev_dbg(&spi->dev, "probing tlv320aic26 spi device\n");
 347
 348         /* Allocate driver data */
 349         aic26 = devm_kzalloc(&spi->dev, sizeof *aic26, GFP_KERNEL);
 350         if (!aic26)
 351                 return -ENOMEM;
 352
 353         aic26->regmap = devm_regmap_init_spi(spi, &aic26_regmap);
 354         if (IS_ERR(aic26->regmap))
 355                 return PTR_ERR(aic26->regmap);
 356
 357         /* Initialize the driver data */
 358         aic26->spi = spi;
 359         dev_set_drvdata(&spi->dev, aic26);
 360         aic26->master = 1;
 361
 362         ret = snd_soc_register_codec(&spi->dev,
 363                         &aic26_soc_codec_dev, &aic26_dai, 1);
 364         return ret;
 365 }
 366
 367 static int aic26_spi_remove(struct spi_device *spi)
 368 {
 369         snd_soc_unregister_codec(&spi->dev);
 370         return 0;
 371 }
 372
 373 static struct spi_driver aic26_spi = {
 374         .driver = {
 375                 .name = "tlv320aic26-codec",
 376         },
 377         .probe = aic26_spi_probe,
 378         .remove = aic26_spi_remove,
 379 };
 380
 381 module_spi_driver(aic26_spi);