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 <linux/of_device.h>
  19 #include <linux/of_gpio.h>
  20 #include <sound/asoundef.h>
  21
  22 /* AK4104 registers addresses */
  23 #define AK4104_REG_CONTROL1             0x00
  24 #define AK4104_REG_RESERVED             0x01
  25 #define AK4104_REG_CONTROL2             0x02
  26 #define AK4104_REG_TX                   0x03
  27 #define AK4104_REG_CHN_STATUS(x)        ((x) + 0x04)
  28 #define AK4104_NUM_REGS                 10
  29
  30 #define AK4104_REG_MASK                 0x1f
  31 #define AK4104_READ                     0xc0
  32 #define AK4104_WRITE                    0xe0
  33 #define AK4104_RESERVED_VAL             0x5b
  34
  35 /* Bit masks for AK4104 registers */
  36 #define AK4104_CONTROL1_RSTN            (1 << 0)
  37 #define AK4104_CONTROL1_PW              (1 << 1)
  38 #define AK4104_CONTROL1_DIF0            (1 << 2)
  39 #define AK4104_CONTROL1_DIF1            (1 << 3)
  40
  41 #define AK4104_CONTROL2_SEL0            (1 << 0)
  42 #define AK4104_CONTROL2_SEL1            (1 << 1)
  43 #define AK4104_CONTROL2_MODE            (1 << 2)
  44
  45 #define AK4104_TX_TXE                   (1 << 0)
  46 #define AK4104_TX_V                     (1 << 1)
  47
  48 #define DRV_NAME "ak4104-codec"
  49
  50 struct ak4104_private {
  51         struct regmap *regmap;
  52 };
  53
  54 static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai,
  55                               unsigned int format)
  56 {
  57         struct snd_soc_codec *codec = codec_dai->codec;
  58         int val = 0;
  59         int ret;
  60
  61         /* set DAI format */
  62         switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
  63         case SND_SOC_DAIFMT_RIGHT_J:
  64                 break;
  65         case SND_SOC_DAIFMT_LEFT_J:
  66                 val |= AK4104_CONTROL1_DIF0;
  67                 break;
  68         case SND_SOC_DAIFMT_I2S:
  69                 val |= AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1;
  70                 break;
  71         default:
  72                 dev_err(codec->dev, "invalid dai format\n");
  73                 return -EINVAL;
  74         }
  75
  76         /* This device can only be slave */
  77         if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS)
  78                 return -EINVAL;
  79
  80         ret = snd_soc_update_bits(codec, AK4104_REG_CONTROL1,
  81                                   AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1,
  82                                   val);
  83         if (ret < 0)
  84                 return ret;
  85
  86         return 0;
  87 }
  88
  89 static int ak4104_hw_params(struct snd_pcm_substream *substream,
  90                             struct snd_pcm_hw_params *params,
  91                             struct snd_soc_dai *dai)
  92 {
  93         struct snd_soc_codec *codec = dai->codec;
  94         int val = 0;
  95
  96         /* set the IEC958 bits: consumer mode, no copyright bit */
  97         val |= IEC958_AES0_CON_NOT_COPYRIGHT;
  98         snd_soc_write(codec, AK4104_REG_CHN_STATUS(0), val);
  99
 100         val = 0;
 101
 102         switch (params_rate(params)) {
 103         case 22050:
 104                 val |= IEC958_AES3_CON_FS_22050;
 105                 break;
 106         case 24000:
 107                 val |= IEC958_AES3_CON_FS_24000;
 108                 break;
 109         case 32000:
 110                 val |= IEC958_AES3_CON_FS_32000;
 111                 break;
 112         case 44100:
 113                 val |= IEC958_AES3_CON_FS_44100;
 114                 break;
 115         case 48000:
 116                 val |= IEC958_AES3_CON_FS_48000;
 117                 break;
 118         case 88200:
 119                 val |= IEC958_AES3_CON_FS_88200;
 120                 break;
 121         case 96000:
 122                 val |= IEC958_AES3_CON_FS_96000;
 123                 break;
 124         case 176400:
 125                 val |= IEC958_AES3_CON_FS_176400;
 126                 break;
 127         case 192000:
 128                 val |= IEC958_AES3_CON_FS_192000;
 129                 break;
 130         default:
 131                 dev_err(codec->dev, "unsupported sampling rate\n");
 132                 return -EINVAL;
 133         }
 134
 135         return snd_soc_write(codec, AK4104_REG_CHN_STATUS(3), val);
 136 }
 137
 138 static const struct snd_soc_dai_ops ak4101_dai_ops = {
 139         .hw_params = ak4104_hw_params,
 140         .set_fmt = ak4104_set_dai_fmt,
 141 };
 142
 143 static struct snd_soc_dai_driver ak4104_dai = {
 144         .name = "ak4104-hifi",
 145         .playback = {
 146                 .stream_name = "Playback",
 147                 .channels_min = 2,
 148                 .channels_max = 2,
 149                 .rates = SNDRV_PCM_RATE_8000_192000,
 150                 .formats = SNDRV_PCM_FMTBIT_S16_LE  |
 151                            SNDRV_PCM_FMTBIT_S24_3LE |
 152                            SNDRV_PCM_FMTBIT_S24_LE
 153         },
 154         .ops = &ak4101_dai_ops,
 155 };
 156
 157 static int ak4104_probe(struct snd_soc_codec *codec)
 158 {
 159         struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
 160         int ret;
 161
 162         codec->control_data = ak4104->regmap;
 163         ret = snd_soc_codec_set_cache_io(codec, 8, 8, SND_SOC_REGMAP);
 164         if (ret != 0)
 165                 return ret;
 166
 167         /* set power-up and non-reset bits */
 168         ret = snd_soc_update_bits(codec, AK4104_REG_CONTROL1,
 169                                   AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN,
 170                                   AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN);
 171         if (ret < 0)
 172                 return ret;
 173
 174         /* enable transmitter */
 175         ret = snd_soc_update_bits(codec, AK4104_REG_TX,
 176                                   AK4104_TX_TXE, AK4104_TX_TXE);
 177         if (ret < 0)
 178                 return ret;
 179
 180         return 0;
 181 }
 182
 183 static int ak4104_remove(struct snd_soc_codec *codec)
 184 {
 185         snd_soc_update_bits(codec, AK4104_REG_CONTROL1,
 186                             AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN, 0);
 187
 188         return 0;
 189 }
 190
 191 static struct snd_soc_codec_driver soc_codec_device_ak4104 = {
 192         .probe =        ak4104_probe,
 193         .remove =       ak4104_remove,
 194 };
 195
 196 static const struct regmap_config ak4104_regmap = {
 197         .reg_bits = 8,
 198         .val_bits = 8,
 199
 200         .max_register = AK4104_NUM_REGS - 1,
 201         .read_flag_mask = AK4104_READ,
 202         .write_flag_mask = AK4104_WRITE,
 203
 204         .cache_type = REGCACHE_RBTREE,
 205 };
 206
 207 static int ak4104_spi_probe(struct spi_device *spi)
 208 {
 209         struct device_node *np = spi->dev.of_node;
 210         struct ak4104_private *ak4104;
 211         unsigned int val;
 212         int ret;
 213
 214         spi->bits_per_word = 8;
 215         spi->mode = SPI_MODE_0;
 216         ret = spi_setup(spi);
 217         if (ret < 0)
 218                 return ret;
 219
 220         ak4104 = devm_kzalloc(&spi->dev, sizeof(struct ak4104_private),
 221                               GFP_KERNEL);
 222         if (ak4104 == NULL)
 223                 return -ENOMEM;
 224
 225         ak4104->regmap = devm_regmap_init_spi(spi, &ak4104_regmap);
 226         if (IS_ERR(ak4104->regmap)) {
 227                 ret = PTR_ERR(ak4104->regmap);
 228                 return ret;
 229         }
 230
 231         if (np) {
 232                 enum of_gpio_flags flags;
 233                 int gpio = of_get_named_gpio_flags(np, "reset-gpio", 0, &flags);
 234
 235                 if (gpio_is_valid(gpio)) {
 236                         ret = devm_gpio_request_one(&spi->dev, gpio,
 237                                      flags & OF_GPIO_ACTIVE_LOW ?
 238                                         GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH,
 239                                      "ak4104 reset");
 240                         if (ret < 0)
 241                                 return ret;
 242                 }
 243         }
 244
 245         /* read the 'reserved' register - according to the datasheet, it
 246          * should contain 0x5b. Not a good way to verify the presence of
 247          * the device, but there is no hardware ID register. */
 248         ret = regmap_read(ak4104->regmap, AK4104_REG_RESERVED, &val);
 249         if (ret != 0)
 250                 return ret;
 251         if (val != AK4104_RESERVED_VAL)
 252                 return -ENODEV;
 253
 254         spi_set_drvdata(spi, ak4104);
 255
 256         ret = snd_soc_register_codec(&spi->dev,
 257                         &soc_codec_device_ak4104, &ak4104_dai, 1);
 258         return ret;
 259 }
 260
 261 static int ak4104_spi_remove(struct spi_device *spi)
 262 {
 263         snd_soc_unregister_codec(&spi->dev);
 264         return 0;
 265 }
 266
 267 static const struct of_device_id ak4104_of_match[] = {
 268         { .compatible = "asahi-kasei,ak4104", },
 269         { }
 270 };
 271 MODULE_DEVICE_TABLE(of, ak4104_of_match);
 272
 273 static struct spi_driver ak4104_spi_driver = {
 274         .driver  = {
 275                 .name   = DRV_NAME,
 276                 .owner  = THIS_MODULE,
 277                 .of_match_table = ak4104_of_match,
 278         },
 279         .probe  = ak4104_spi_probe,
 280         .remove = ak4104_spi_remove,
 281 };
 282
 283 module_spi_driver(ak4104_spi_driver);
 284
 285 MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
 286 MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver");
 287 MODULE_LICENSE("GPL");
 288