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         struct regmap *regmap;
  50 };
  51
  52 static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai,
  53                               unsigned int format)
  54 {
  55         struct snd_soc_codec *codec = codec_dai->codec;
  56         int val = 0;
  57         int ret;
  58
  59         /* set DAI format */
  60         switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
  61         case SND_SOC_DAIFMT_RIGHT_J:
  62                 break;
  63         case SND_SOC_DAIFMT_LEFT_J:
  64                 val |= AK4104_CONTROL1_DIF0;
  65                 break;
  66         case SND_SOC_DAIFMT_I2S:
  67                 val |= AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1;
  68                 break;
  69         default:
  70                 dev_err(codec->dev, "invalid dai format\n");
  71                 return -EINVAL;
  72         }
  73
  74         /* This device can only be slave */
  75         if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS)
  76                 return -EINVAL;
  77
  78         ret = snd_soc_update_bits(codec, AK4104_REG_CONTROL1,
  79                                   AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1,
  80                                   val);
  81         if (ret < 0)
  82                 return ret;
  83
  84         return 0;
  85 }
  86
  87 static int ak4104_hw_params(struct snd_pcm_substream *substream,
  88                             struct snd_pcm_hw_params *params,
  89                             struct snd_soc_dai *dai)
  90 {
  91         struct snd_soc_codec *codec = dai->codec;
  92         int val = 0;
  93
  94         /* set the IEC958 bits: consumer mode, no copyright bit */
  95         val |= IEC958_AES0_CON_NOT_COPYRIGHT;
  96         snd_soc_write(codec, AK4104_REG_CHN_STATUS(0), val);
  97
  98         val = 0;
  99
 100         switch (params_rate(params)) {
 101         case 44100:
 102                 val |= IEC958_AES3_CON_FS_44100;
 103                 break;
 104         case 48000:
 105                 val |= IEC958_AES3_CON_FS_48000;
 106                 break;
 107         case 32000:
 108                 val |= IEC958_AES3_CON_FS_32000;
 109                 break;
 110         default:
 111                 dev_err(codec->dev, "unsupported sampling rate\n");
 112                 return -EINVAL;
 113         }
 114
 115         return snd_soc_write(codec, AK4104_REG_CHN_STATUS(3), val);
 116 }
 117
 118 static const struct snd_soc_dai_ops ak4101_dai_ops = {
 119         .hw_params = ak4104_hw_params,
 120         .set_fmt = ak4104_set_dai_fmt,
 121 };
 122
 123 static struct snd_soc_dai_driver ak4104_dai = {
 124         .name = "ak4104-hifi",
 125         .playback = {
 126                 .stream_name = "Playback",
 127                 .channels_min = 2,
 128                 .channels_max = 2,
 129                 .rates = SNDRV_PCM_RATE_8000_192000,
 130                 .formats = SNDRV_PCM_FMTBIT_S16_LE  |
 131                            SNDRV_PCM_FMTBIT_S24_3LE |
 132                            SNDRV_PCM_FMTBIT_S24_LE
 133         },
 134         .ops = &ak4101_dai_ops,
 135 };
 136
 137 static int ak4104_probe(struct snd_soc_codec *codec)
 138 {
 139         struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
 140         int ret;
 141
 142         codec->control_data = ak4104->regmap;
 143         ret = snd_soc_codec_set_cache_io(codec, 8, 8, SND_SOC_REGMAP);
 144         if (ret != 0)
 145                 return ret;
 146
 147         /* set power-up and non-reset bits */
 148         ret = snd_soc_update_bits(codec, AK4104_REG_CONTROL1,
 149                                   AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN,
 150                                   AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN);
 151         if (ret < 0)
 152                 return ret;
 153
 154         /* enable transmitter */
 155         ret = snd_soc_update_bits(codec, AK4104_REG_TX,
 156                                   AK4104_TX_TXE, AK4104_TX_TXE);
 157         if (ret < 0)
 158                 return ret;
 159
 160         return 0;
 161 }
 162
 163 static int ak4104_remove(struct snd_soc_codec *codec)
 164 {
 165         snd_soc_update_bits(codec, AK4104_REG_CONTROL1,
 166                             AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN, 0);
 167
 168         return 0;
 169 }
 170
 171 static struct snd_soc_codec_driver soc_codec_device_ak4104 = {
 172         .probe =        ak4104_probe,
 173         .remove =       ak4104_remove,
 174 };
 175
 176 static const struct regmap_config ak4104_regmap = {
 177         .reg_bits = 8,
 178         .val_bits = 8,
 179
 180         .max_register = AK4104_NUM_REGS - 1,
 181         .read_flag_mask = AK4104_READ,
 182         .write_flag_mask = AK4104_WRITE,
 183
 184         .cache_type = REGCACHE_RBTREE,
 185 };
 186
 187 static int ak4104_spi_probe(struct spi_device *spi)
 188 {
 189         struct ak4104_private *ak4104;
 190         unsigned int val;
 191         int ret;
 192
 193         spi->bits_per_word = 8;
 194         spi->mode = SPI_MODE_0;
 195         ret = spi_setup(spi);
 196         if (ret < 0)
 197                 return ret;
 198
 199         ak4104 = devm_kzalloc(&spi->dev, sizeof(struct ak4104_private),
 200                               GFP_KERNEL);
 201         if (ak4104 == NULL)
 202                 return -ENOMEM;
 203
 204         ak4104->regmap = regmap_init_spi(spi, &ak4104_regmap);
 205         if (IS_ERR(ak4104->regmap)) {
 206                 ret = PTR_ERR(ak4104->regmap);
 207                 return ret;
 208         }
 209
 210         /* read the 'reserved' register - according to the datasheet, it
 211          * should contain 0x5b. Not a good way to verify the presence of
 212          * the device, but there is no hardware ID register. */
 213         ret = regmap_read(ak4104->regmap, AK4104_REG_RESERVED, &val);
 214         if (ret != 0)
 215                 goto err;
 216         if (val != AK4104_RESERVED_VAL) {
 217                 ret = -ENODEV;
 218                 goto err;
 219         }
 220
 221         spi_set_drvdata(spi, ak4104);
 222
 223         ret = snd_soc_register_codec(&spi->dev,
 224                         &soc_codec_device_ak4104, &ak4104_dai, 1);
 225         if (ret != 0)
 226                 goto err;
 227
 228         return 0;
 229
 230 err:
 231         regmap_exit(ak4104->regmap);
 232         return ret;
 233 }
 234
 235 static int __devexit ak4104_spi_remove(struct spi_device *spi)
 236 {
 237         struct ak4104_private *ak4101 = spi_get_drvdata(spi);
 238         regmap_exit(ak4101->regmap);
 239         snd_soc_unregister_codec(&spi->dev);
 240         return 0;
 241 }
 242
 243 static struct spi_driver ak4104_spi_driver = {
 244         .driver  = {
 245                 .name   = DRV_NAME,
 246                 .owner  = THIS_MODULE,
 247         },
 248         .probe  = ak4104_spi_probe,
 249         .remove = __devexit_p(ak4104_spi_remove),
 250 };
 251
 252 module_spi_driver(ak4104_spi_driver);
 253
 254 MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
 255 MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver");
 256 MODULE_LICENSE("GPL");
 257