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 <linux/slab.h>
  14 #include <sound/core.h>
  15 #include <sound/soc.h>
  16 #include <sound/initval.h>
  17 #include <linux/spi/spi.h>
  18 #include <sound/asoundef.h>
  19
  20 /* AK4104 registers addresses */
  21 #define AK4104_REG_CONTROL1             0x00
  22 #define AK4104_REG_RESERVED             0x01
  23 #define AK4104_REG_CONTROL2             0x02
  24 #define AK4104_REG_TX                   0x03
  25 #define AK4104_REG_CHN_STATUS(x)        ((x) + 0x04)
  26 #define AK4104_NUM_REGS                 10
  27
  28 #define AK4104_REG_MASK                 0x1f
  29 #define AK4104_READ                     0xc0
  30 #define AK4104_WRITE                    0xe0
  31 #define AK4104_RESERVED_VAL             0x5b
  32
  33 /* Bit masks for AK4104 registers */
  34 #define AK4104_CONTROL1_RSTN            (1 << 0)
  35 #define AK4104_CONTROL1_PW              (1 << 1)
  36 #define AK4104_CONTROL1_DIF0            (1 << 2)
  37 #define AK4104_CONTROL1_DIF1            (1 << 3)
  38
  39 #define AK4104_CONTROL2_SEL0            (1 << 0)
  40 #define AK4104_CONTROL2_SEL1            (1 << 1)
  41 #define AK4104_CONTROL2_MODE            (1 << 2)
  42
  43 #define AK4104_TX_TXE                   (1 << 0)
  44 #define AK4104_TX_V                     (1 << 1)
  45
  46 #define DRV_NAME "ak4104-codec"
  47
  48 struct ak4104_private {
  49         enum snd_soc_control_type control_type;
  50         void *control_data;
  51 };
  52
  53 static int ak4104_fill_cache(struct snd_soc_codec *codec)
  54 {
  55         int i;
  56         u8 *reg_cache = codec->reg_cache;
  57         struct spi_device *spi = codec->control_data;
  58
  59         for (i = 0; i < codec->driver->reg_cache_size; i++) {
  60                 int ret = spi_w8r8(spi, i | AK4104_READ);
  61                 if (ret < 0) {
  62                         dev_err(&spi->dev, "SPI write failure\n");
  63                         return ret;
  64                 }
  65
  66                 reg_cache[i] = ret;
  67         }
  68
  69         return 0;
  70 }
  71
  72 static unsigned int ak4104_read_reg_cache(struct snd_soc_codec *codec,
  73                                           unsigned int reg)
  74 {
  75         u8 *reg_cache = codec->reg_cache;
  76
  77         if (reg >= codec->driver->reg_cache_size)
  78                 return -EINVAL;
  79
  80         return reg_cache[reg];
  81 }
  82
  83 static int ak4104_spi_write(struct snd_soc_codec *codec, unsigned int reg,
  84                             unsigned int value)
  85 {
  86         u8 *cache = codec->reg_cache;
  87         struct spi_device *spi = codec->control_data;
  88
  89         if (reg >= codec->driver->reg_cache_size)
  90                 return -EINVAL;
  91
  92         /* only write to the hardware if value has changed */
  93         if (cache[reg] != value) {
  94                 u8 tmp[2] = { (reg & AK4104_REG_MASK) | AK4104_WRITE, value };
  95
  96                 if (spi_write(spi, tmp, sizeof(tmp))) {
  97                         dev_err(&spi->dev, "SPI write failed\n");
  98                         return -EIO;
  99                 }
 100
 101                 cache[reg] = value;
 102         }
 103
 104         return 0;
 105 }
 106
 107 static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai,
 108                               unsigned int format)
 109 {
 110         struct snd_soc_codec *codec = codec_dai->codec;
 111         int val = 0;
 112
 113         val = ak4104_read_reg_cache(codec, AK4104_REG_CONTROL1);
 114         if (val < 0)
 115                 return val;
 116
 117         val &= ~(AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1);
 118
 119         /* set DAI format */
 120         switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
 121         case SND_SOC_DAIFMT_RIGHT_J:
 122                 break;
 123         case SND_SOC_DAIFMT_LEFT_J:
 124                 val |= AK4104_CONTROL1_DIF0;
 125                 break;
 126         case SND_SOC_DAIFMT_I2S:
 127                 val |= AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1;
 128                 break;
 129         default:
 130                 dev_err(codec->dev, "invalid dai format\n");
 131                 return -EINVAL;
 132         }
 133
 134         /* This device can only be slave */
 135         if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS)
 136                 return -EINVAL;
 137
 138         return ak4104_spi_write(codec, AK4104_REG_CONTROL1, val);
 139 }
 140
 141 static int ak4104_hw_params(struct snd_pcm_substream *substream,
 142                             struct snd_pcm_hw_params *params,
 143                             struct snd_soc_dai *dai)
 144 {
 145         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 146         struct snd_soc_codec *codec = rtd->codec;
 147         int val = 0;
 148
 149         /* set the IEC958 bits: consumer mode, no copyright bit */
 150         val |= IEC958_AES0_CON_NOT_COPYRIGHT;
 151         ak4104_spi_write(codec, AK4104_REG_CHN_STATUS(0), val);
 152
 153         val = 0;
 154
 155         switch (params_rate(params)) {
 156         case 44100:
 157                 val |= IEC958_AES3_CON_FS_44100;
 158                 break;
 159         case 48000:
 160                 val |= IEC958_AES3_CON_FS_48000;
 161                 break;
 162         case 32000:
 163                 val |= IEC958_AES3_CON_FS_32000;
 164                 break;
 165         default:
 166                 dev_err(codec->dev, "unsupported sampling rate\n");
 167                 return -EINVAL;
 168         }
 169
 170         return ak4104_spi_write(codec, AK4104_REG_CHN_STATUS(3), val);
 171 }
 172
 173 static struct snd_soc_dai_ops ak4101_dai_ops = {
 174         .hw_params = ak4104_hw_params,
 175         .set_fmt = ak4104_set_dai_fmt,
 176 };
 177
 178 static struct snd_soc_dai_driver ak4104_dai = {
 179         .name = "ak4104-hifi",
 180         .playback = {
 181                 .stream_name = "Playback",
 182                 .channels_min = 2,
 183                 .channels_max = 2,
 184                 .rates = SNDRV_PCM_RATE_8000_192000,
 185                 .formats = SNDRV_PCM_FMTBIT_S16_LE  |
 186                            SNDRV_PCM_FMTBIT_S24_3LE |
 187                            SNDRV_PCM_FMTBIT_S24_LE
 188         },
 189         .ops = &ak4101_dai_ops,
 190 };
 191
 192 static int ak4104_probe(struct snd_soc_codec *codec)
 193 {
 194         struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
 195         int ret, val;
 196
 197         codec->control_data = ak4104->control_data;
 198
 199         /* read all regs and fill the cache */
 200         ret = ak4104_fill_cache(codec);
 201         if (ret < 0) {
 202                 dev_err(codec->dev, "failed to fill register cache\n");
 203                 return ret;
 204         }
 205
 206         /* read the 'reserved' register - according to the datasheet, it
 207          * should contain 0x5b. Not a good way to verify the presence of
 208          * the device, but there is no hardware ID register. */
 209         if (ak4104_read_reg_cache(codec, AK4104_REG_RESERVED) !=
 210                                          AK4104_RESERVED_VAL)
 211                 return -ENODEV;
 212
 213         /* set power-up and non-reset bits */
 214         val = ak4104_read_reg_cache(codec, AK4104_REG_CONTROL1);
 215         val |= AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN;
 216         ret = ak4104_spi_write(codec, AK4104_REG_CONTROL1, val);
 217         if (ret < 0)
 218                 return ret;
 219
 220         /* enable transmitter */
 221         val = ak4104_read_reg_cache(codec, AK4104_REG_TX);
 222         val |= AK4104_TX_TXE;
 223         ret = ak4104_spi_write(codec, AK4104_REG_TX, val);
 224         if (ret < 0)
 225                 return ret;
 226
 227         dev_info(codec->dev, "SPI device initialized\n");
 228         return 0;
 229 }
 230
 231 static int ak4104_remove(struct snd_soc_codec *codec)
 232 {
 233         int val, ret;
 234
 235         val = ak4104_read_reg_cache(codec, AK4104_REG_CONTROL1);
 236         if (val < 0)
 237                 return val;
 238
 239         /* clear power-up and non-reset bits */
 240         val &= ~(AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN);
 241         ret = ak4104_spi_write(codec, AK4104_REG_CONTROL1, val);
 242
 243         return ret;
 244 }
 245
 246 static struct snd_soc_codec_driver soc_codec_device_ak4104 = {
 247         .probe =        ak4104_probe,
 248         .remove =       ak4104_remove,
 249         .reg_cache_size = AK4104_NUM_REGS,
 250         .reg_word_size = sizeof(u16),
 251 };
 252
 253 static int ak4104_spi_probe(struct spi_device *spi)
 254 {
 255         struct ak4104_private *ak4104;
 256         int ret;
 257
 258         spi->bits_per_word = 8;
 259         spi->mode = SPI_MODE_0;
 260         ret = spi_setup(spi);
 261         if (ret < 0)
 262                 return ret;
 263
 264         ak4104 = kzalloc(sizeof(struct ak4104_private), GFP_KERNEL);
 265         if (ak4104 == NULL)
 266                 return -ENOMEM;
 267
 268         ak4104->control_data = spi;
 269         ak4104->control_type = SND_SOC_SPI;
 270         spi_set_drvdata(spi, ak4104);
 271
 272         ret = snd_soc_register_codec(&spi->dev,
 273                         &soc_codec_device_ak4104, &ak4104_dai, 1);
 274         if (ret < 0)
 275                 kfree(ak4104);
 276         return ret;
 277 }
 278
 279 static int __devexit ak4104_spi_remove(struct spi_device *spi)
 280 {
 281         snd_soc_unregister_codec(&spi->dev);
 282         kfree(spi_get_drvdata(spi));
 283         return 0;
 284 }
 285
 286 static struct spi_driver ak4104_spi_driver = {
 287         .driver  = {
 288                 .name   = DRV_NAME,
 289                 .owner  = THIS_MODULE,
 290         },
 291         .probe  = ak4104_spi_probe,
 292         .remove = __devexit_p(ak4104_spi_remove),
 293 };
 294
 295 static int __init ak4104_init(void)
 296 {
 297         pr_info("Asahi Kasei AK4104 ALSA SoC Codec Driver\n");
 298         return spi_register_driver(&ak4104_spi_driver);
 299 }
 300 module_init(ak4104_init);
 301
 302 static void __exit ak4104_exit(void)
 303 {
 304         spi_unregister_driver(&ak4104_spi_driver);
 305 }
 306 module_exit(ak4104_exit);
 307
 308 MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
 309 MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver");
 310 MODULE_LICENSE("GPL");
 311