sound/soc/codecs/ak4104.c

   1 /*
   2  * AK4104 ALSA SoC (ASoC) driver
   3  *
   4  * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
   5  *
   6  *  This program is free software; you can redistribute  it and/or modify it
   7  *  under the terms of  the GNU General  Public License as published by the
   8  *  Free Software Foundation;  either version 2 of the  License, or (at your
   9  *  option) any later version.
  10  */
  11
  12 #include <linux/module.h>
  13 #include <sound/core.h>
  14 #include <sound/soc.h>
  15 #include <sound/initval.h>
  16 #include <linux/spi/spi.h>
  17 #include <sound/asoundef.h>
  18
  19 #include "ak4104.h"
  20
  21 /* AK4104 registers addresses */
  22 #define AK4104_REG_CONTROL1             0x00
  23 #define AK4104_REG_RESERVED             0x01
  24 #define AK4104_REG_CONTROL2             0x02
  25 #define AK4104_REG_TX                   0x03
  26 #define AK4104_REG_CHN_STATUS(x)        ((x) + 0x04)
  27 #define AK4104_NUM_REGS                 10
  28
  29 #define AK4104_REG_MASK                 0x1f
  30 #define AK4104_READ                     0xc0
  31 #define AK4104_WRITE                    0xe0
  32 #define AK4104_RESERVED_VAL             0x5b
  33
  34 /* Bit masks for AK4104 registers */
  35 #define AK4104_CONTROL1_RSTN            (1 << 0)
  36 #define AK4104_CONTROL1_PW              (1 << 1)
  37 #define AK4104_CONTROL1_DIF0            (1 << 2)
  38 #define AK4104_CONTROL1_DIF1            (1 << 3)
  39
  40 #define AK4104_CONTROL2_SEL0            (1 << 0)
  41 #define AK4104_CONTROL2_SEL1            (1 << 1)
  42 #define AK4104_CONTROL2_MODE            (1 << 2)
  43
  44 #define AK4104_TX_TXE                   (1 << 0)
  45 #define AK4104_TX_V                     (1 << 1)
  46
  47 #define DRV_NAME "ak4104"
  48
  49 struct ak4104_private {
  50         struct snd_soc_codec codec;
  51         u8 reg_cache[AK4104_NUM_REGS];
  52 };
  53
  54 static int ak4104_fill_cache(struct snd_soc_codec *codec)
  55 {
  56         int i;
  57         u8 *reg_cache = codec->reg_cache;
  58         struct spi_device *spi = codec->control_data;
  59
  60         for (i = 0; i < codec->reg_cache_size; i++) {
  61                 int ret = spi_w8r8(spi, i | AK4104_READ);
  62                 if (ret < 0) {
  63                         dev_err(&spi->dev, "SPI write failure\n");
  64                         return ret;
  65                 }
  66
  67                 reg_cache[i] = ret;
  68         }
  69
  70         return 0;
  71 }
  72
  73 static unsigned int ak4104_read_reg_cache(struct snd_soc_codec *codec,
  74                                           unsigned int reg)
  75 {
  76         u8 *reg_cache = codec->reg_cache;
  77
  78         if (reg >= codec->reg_cache_size)
  79                 return -EINVAL;
  80
  81         return reg_cache[reg];
  82 }
  83
  84 static int ak4104_spi_write(struct snd_soc_codec *codec, unsigned int reg,
  85                             unsigned int value)
  86 {
  87         u8 *cache = codec->reg_cache;
  88         struct spi_device *spi = codec->control_data;
  89
  90         if (reg >= codec->reg_cache_size)
  91                 return -EINVAL;
  92
  93         reg &= AK4104_REG_MASK;
  94         reg |= AK4104_WRITE;
  95
  96         /* only write to the hardware if value has changed */
  97         if (cache[reg] != value) {
  98                 u8 tmp[2] = { reg, value };
  99                 if (spi_write(spi, tmp, sizeof(tmp))) {
 100                         dev_err(&spi->dev, "SPI write failed\n");
 101                         return -EIO;
 102                 }
 103
 104                 cache[reg] = value;
 105         }
 106
 107         return 0;
 108 }
 109
 110 static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai,
 111                               unsigned int format)
 112 {
 113         struct snd_soc_codec *codec = codec_dai->codec;
 114         int val = 0;
 115
 116         val = ak4104_read_reg_cache(codec, AK4104_REG_CONTROL1);
 117         if (val < 0)
 118                 return val;
 119
 120         val &= ~(AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1);
 121
 122         /* set DAI format */
 123         switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
 124         case SND_SOC_DAIFMT_RIGHT_J:
 125                 break;
 126         case SND_SOC_DAIFMT_LEFT_J:
 127                 val |= AK4104_CONTROL1_DIF0;
 128                 break;
 129         case SND_SOC_DAIFMT_I2S:
 130                 val |= AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1;
 131                 break;
 132         default:
 133                 dev_err(codec->dev, "invalid dai format\n");
 134                 return -EINVAL;
 135         }
 136
 137         /* This device can only be slave */
 138         if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS)
 139                 return -EINVAL;
 140
 141         return ak4104_spi_write(codec, AK4104_REG_CONTROL1, val);
 142 }
 143
 144 static int ak4104_hw_params(struct snd_pcm_substream *substream,
 145                             struct snd_pcm_hw_params *params,
 146                             struct snd_soc_dai *dai)
 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         int val = 0;
 152
 153         /* set the IEC958 bits: consumer mode, no copyright bit */
 154         val |= IEC958_AES0_CON_NOT_COPYRIGHT;
 155         ak4104_spi_write(codec, AK4104_REG_CHN_STATUS(0), val);
 156
 157         val = 0;
 158
 159         switch (params_rate(params)) {
 160         case 44100:
 161                 val |= IEC958_AES3_CON_FS_44100;
 162                 break;
 163         case 48000:
 164                 val |= IEC958_AES3_CON_FS_48000;
 165                 break;
 166         case 32000:
 167                 val |= IEC958_AES3_CON_FS_32000;
 168                 break;
 169         default:
 170                 dev_err(codec->dev, "unsupported sampling rate\n");
 171                 return -EINVAL;
 172         }
 173
 174         return ak4104_spi_write(codec, AK4104_REG_CHN_STATUS(3), val);
 175 }
 176
 177 static struct snd_soc_dai_ops ak4101_dai_ops = {
 178         .hw_params = ak4104_hw_params,
 179         .set_fmt = ak4104_set_dai_fmt,
 180 };
 181
 182 struct snd_soc_dai ak4104_dai = {
 183         .name = DRV_NAME,
 184         .playback = {
 185                 .stream_name = "Playback",
 186                 .channels_min = 2,
 187                 .channels_max = 2,
 188                 .rates = SNDRV_PCM_RATE_44100 |
 189                          SNDRV_PCM_RATE_48000 |
 190                          SNDRV_PCM_RATE_32000,
 191                 .formats = SNDRV_PCM_FMTBIT_S16_LE  |
 192                            SNDRV_PCM_FMTBIT_S24_3LE |
 193                            SNDRV_PCM_FMTBIT_S24_LE
 194         },
 195         .ops = &ak4101_dai_ops,
 196 };
 197
 198 static struct snd_soc_codec *ak4104_codec;
 199
 200 static int ak4104_spi_probe(struct spi_device *spi)
 201 {
 202         struct snd_soc_codec *codec;
 203         struct ak4104_private *ak4104;
 204         int ret, val;
 205
 206         spi->bits_per_word = 8;
 207         spi->mode = SPI_MODE_0;
 208         ret = spi_setup(spi);
 209         if (ret < 0)
 210                 return ret;
 211
 212         ak4104 = kzalloc(sizeof(struct ak4104_private), GFP_KERNEL);
 213         if (!ak4104) {
 214                 dev_err(&spi->dev, "could not allocate codec\n");
 215                 return -ENOMEM;
 216         }
 217
 218         codec = &ak4104->codec;
 219         mutex_init(&codec->mutex);
 220         INIT_LIST_HEAD(&codec->dapm_widgets);
 221         INIT_LIST_HEAD(&codec->dapm_paths);
 222
 223         codec->dev = &spi->dev;
 224         codec->name = DRV_NAME;
 225         codec->owner = THIS_MODULE;
 226         codec->dai = &ak4104_dai;
 227         codec->num_dai = 1;
 228         codec->private_data = ak4104;
 229         codec->control_data = spi;
 230         codec->reg_cache = ak4104->reg_cache;
 231         codec->reg_cache_size = AK4104_NUM_REGS;
 232
 233         /* read all regs and fill the cache */
 234         ret = ak4104_fill_cache(codec);
 235         if (ret < 0) {
 236                 dev_err(&spi->dev, "failed to fill register cache\n");
 237                 return ret;
 238         }
 239
 240         /* read the 'reserved' register - according to the datasheet, it
 241          * should contain 0x5b. Not a good way to verify the presence of
 242          * the device, but there is no hardware ID register. */
 243         if (ak4104_read_reg_cache(codec, AK4104_REG_RESERVED) !=
 244                                          AK4104_RESERVED_VAL) {
 245                 ret = -ENODEV;
 246                 goto error_free_codec;
 247         }
 248
 249         /* set power-up and non-reset bits */
 250         val = ak4104_read_reg_cache(codec, AK4104_REG_CONTROL1);
 251         val |= AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN;
 252         ret = ak4104_spi_write(codec, AK4104_REG_CONTROL1, val);
 253         if (ret < 0)
 254                 goto error_free_codec;
 255
 256         /* enable transmitter */
 257         val = ak4104_read_reg_cache(codec, AK4104_REG_TX);
 258         val |= AK4104_TX_TXE;
 259         ret = ak4104_spi_write(codec, AK4104_REG_TX, val);
 260         if (ret < 0)
 261                 goto error_free_codec;
 262
 263         ak4104_codec = codec;
 264         ret = snd_soc_register_dai(&ak4104_dai);
 265         if (ret < 0) {
 266                 dev_err(&spi->dev, "failed to register DAI\n");
 267                 goto error_free_codec;
 268         }
 269
 270         spi_set_drvdata(spi, ak4104);
 271         dev_info(&spi->dev, "SPI device initialized\n");
 272         return 0;
 273
 274 error_free_codec:
 275         kfree(ak4104);
 276         ak4104_dai.dev = NULL;
 277         return ret;
 278 }
 279
 280 static int __devexit ak4104_spi_remove(struct spi_device *spi)
 281 {
 282         int ret, val;
 283         struct ak4104_private *ak4104 = spi_get_drvdata(spi);
 284
 285         val = ak4104_read_reg_cache(&ak4104->codec, AK4104_REG_CONTROL1);
 286         if (val < 0)
 287                 return val;
 288
 289         /* clear power-up and non-reset bits */
 290         val &= ~(AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN);
 291         ret = ak4104_spi_write(&ak4104->codec, AK4104_REG_CONTROL1, val);
 292         if (ret < 0)
 293                 return ret;
 294
 295         ak4104_codec = NULL;
 296         kfree(ak4104);
 297         return 0;
 298 }
 299
 300 static int ak4104_probe(struct platform_device *pdev)
 301 {
 302         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 303         struct snd_soc_codec *codec = ak4104_codec;
 304         int ret;
 305
 306         /* Connect the codec to the socdev.  snd_soc_new_pcms() needs this. */
 307         socdev->card->codec = codec;
 308
 309         /* Register PCMs */
 310         ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
 311         if (ret < 0) {
 312                 dev_err(codec->dev, "failed to create pcms\n");
 313                 return ret;
 314         }
 315
 316         /* Register the socdev */
 317         ret = snd_soc_init_card(socdev);
 318         if (ret < 0) {
 319                 dev_err(codec->dev, "failed to register card\n");
 320                 snd_soc_free_pcms(socdev);
 321                 return ret;
 322         }
 323
 324         return 0;
 325 }
 326
 327 static int ak4104_remove(struct platform_device *pdev)
 328 {
 329         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 330         snd_soc_free_pcms(socdev);
 331         return 0;
 332 };
 333
 334 struct snd_soc_codec_device soc_codec_device_ak4104 = {
 335         .probe =        ak4104_probe,
 336         .remove =       ak4104_remove
 337 };
 338 EXPORT_SYMBOL_GPL(soc_codec_device_ak4104);
 339
 340 static struct spi_driver ak4104_spi_driver = {
 341         .driver  = {
 342                 .name   = DRV_NAME,
 343                 .owner  = THIS_MODULE,
 344         },
 345         .probe  = ak4104_spi_probe,
 346         .remove = __devexit_p(ak4104_spi_remove),
 347 };
 348
 349 static int __init ak4104_init(void)
 350 {
 351         pr_info("Asahi Kasei AK4104 ALSA SoC Codec Driver\n");
 352         return spi_register_driver(&ak4104_spi_driver);
 353 }
 354 module_init(ak4104_init);
 355
 356 static void __exit ak4104_exit(void)
 357 {
 358         spi_unregister_driver(&ak4104_spi_driver);
 359 }
 360 module_exit(ak4104_exit);
 361
 362 MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
 363 MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver");
 364 MODULE_LICENSE("GPL");
 365