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_pcm_runtime *rtd = substream->private_data;
  92         struct snd_soc_codec *codec = rtd->codec;
  93         int val = 0;
  94
  95         /* set the IEC958 bits: consumer mode, no copyright bit */
  96         val |= IEC958_AES0_CON_NOT_COPYRIGHT;
  97         snd_soc_write(codec, AK4104_REG_CHN_STATUS(0), val);
  98
  99         val = 0;
 100
 101         switch (params_rate(params)) {
 102         case 44100:
 103                 val |= IEC958_AES3_CON_FS_44100;
 104                 break;
 105         case 48000:
 106                 val |= IEC958_AES3_CON_FS_48000;
 107                 break;
 108         case 32000:
 109                 val |= IEC958_AES3_CON_FS_32000;
 110                 break;
 111         default:
 112                 dev_err(codec->dev, "unsupported sampling rate\n");
 113                 return -EINVAL;
 114         }
 115
 116         return snd_soc_write(codec, AK4104_REG_CHN_STATUS(3), val);
 117 }
 118
 119 static const struct snd_soc_dai_ops ak4101_dai_ops = {
 120         .hw_params = ak4104_hw_params,
 121         .set_fmt = ak4104_set_dai_fmt,
 122 };
 123
 124 static struct snd_soc_dai_driver ak4104_dai = {
 125         .name = "ak4104-hifi",
 126         .playback = {
 127                 .stream_name = "Playback",
 128                 .channels_min = 2,
 129                 .channels_max = 2,
 130                 .rates = SNDRV_PCM_RATE_8000_192000,
 131                 .formats = SNDRV_PCM_FMTBIT_S16_LE  |
 132                            SNDRV_PCM_FMTBIT_S24_3LE |
 133                            SNDRV_PCM_FMTBIT_S24_LE
 134         },
 135         .ops = &ak4101_dai_ops,
 136 };
 137
 138 static int ak4104_probe(struct snd_soc_codec *codec)
 139 {
 140         struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
 141         int ret;
 142
 143         codec->control_data = ak4104->regmap;
 144         ret = snd_soc_codec_set_cache_io(codec, 8, 8, SND_SOC_REGMAP);
 145         if (ret != 0)
 146                 return ret;
 147
 148         /* set power-up and non-reset bits */
 149         ret = snd_soc_update_bits(codec, AK4104_REG_CONTROL1,
 150                                   AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN,
 151                                   AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN);
 152         if (ret < 0)
 153                 return ret;
 154
 155         /* enable transmitter */
 156         ret = snd_soc_update_bits(codec, AK4104_REG_TX,
 157                                   AK4104_TX_TXE, AK4104_TX_TXE);
 158         if (ret < 0)
 159                 return ret;
 160
 161         return 0;
 162 }
 163
 164 static int ak4104_remove(struct snd_soc_codec *codec)
 165 {
 166         snd_soc_update_bits(codec, AK4104_REG_CONTROL1,
 167                             AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN, 0);
 168
 169         return 0;
 170 }
 171
 172 static struct snd_soc_codec_driver soc_codec_device_ak4104 = {
 173         .probe =        ak4104_probe,
 174         .remove =       ak4104_remove,
 175 };
 176
 177 static const struct regmap_config ak4104_regmap = {
 178         .reg_bits = 8,
 179         .val_bits = 8,
 180
 181         .max_register = AK4104_NUM_REGS - 1,
 182         .read_flag_mask = AK4104_READ,
 183         .write_flag_mask = AK4104_WRITE,
 184
 185         .cache_type = REGCACHE_RBTREE,
 186 };
 187
 188 static int ak4104_spi_probe(struct spi_device *spi)
 189 {
 190         struct ak4104_private *ak4104;
 191         unsigned int val;
 192         int ret;
 193
 194         spi->bits_per_word = 8;
 195         spi->mode = SPI_MODE_0;
 196         ret = spi_setup(spi);
 197         if (ret < 0)
 198                 return ret;
 199
 200         ak4104 = devm_kzalloc(&spi->dev, sizeof(struct ak4104_private),
 201                               GFP_KERNEL);
 202         if (ak4104 == NULL)
 203                 return -ENOMEM;
 204
 205         ak4104->regmap = regmap_init_spi(spi, &ak4104_regmap);
 206         if (IS_ERR(ak4104->regmap)) {
 207                 ret = PTR_ERR(ak4104->regmap);
 208                 return ret;
 209         }
 210
 211         /* read the 'reserved' register - according to the datasheet, it
 212          * should contain 0x5b. Not a good way to verify the presence of
 213          * the device, but there is no hardware ID register. */
 214         ret = regmap_read(ak4104->regmap, AK4104_REG_RESERVED, &val);
 215         if (ret != 0)
 216                 goto err;
 217         if (val != AK4104_RESERVED_VAL) {
 218                 ret = -ENODEV;
 219                 goto err;
 220         }
 221
 222         spi_set_drvdata(spi, ak4104);
 223
 224         ret = snd_soc_register_codec(&spi->dev,
 225                         &soc_codec_device_ak4104, &ak4104_dai, 1);
 226         if (ret != 0)
 227                 goto err;
 228
 229         return 0;
 230
 231 err:
 232         regmap_exit(ak4104->regmap);
 233         return ret;
 234 }
 235
 236 static int __devexit ak4104_spi_remove(struct spi_device *spi)
 237 {
 238         struct ak4104_private *ak4101 = spi_get_drvdata(spi);
 239         regmap_exit(ak4101->regmap);
 240         snd_soc_unregister_codec(&spi->dev);
 241         return 0;
 242 }
 243
 244 static struct spi_driver ak4104_spi_driver = {
 245         .driver  = {
 246                 .name   = DRV_NAME,
 247                 .owner  = THIS_MODULE,
 248         },
 249         .probe  = ak4104_spi_probe,
 250         .remove = __devexit_p(ak4104_spi_remove),
 251 };
 252
 253 module_spi_driver(ak4104_spi_driver);
 254
 255 MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
 256 MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver");
 257 MODULE_LICENSE("GPL");
 258