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 const struct snd_soc_dapm_widget ak4104_dapm_widgets[] = {
  55 SND_SOC_DAPM_OUTPUT("TX"),
  56 };
  57
  58 static const struct snd_soc_dapm_route ak4104_dapm_routes[] = {
  59         { "TX", NULL, "Playback" },
  60 };
  61
  62 static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai,
  63                               unsigned int format)
  64 {
  65         struct snd_soc_codec *codec = codec_dai->codec;
  66         struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
  67         int val = 0;
  68         int ret;
  69
  70         /* set DAI format */
  71         switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
  72         case SND_SOC_DAIFMT_RIGHT_J:
  73                 break;
  74         case SND_SOC_DAIFMT_LEFT_J:
  75                 val |= AK4104_CONTROL1_DIF0;
  76                 break;
  77         case SND_SOC_DAIFMT_I2S:
  78                 val |= AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1;
  79                 break;
  80         default:
  81                 dev_err(codec->dev, "invalid dai format\n");
  82                 return -EINVAL;
  83         }
  84
  85         /* This device can only be slave */
  86         if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS)
  87                 return -EINVAL;
  88
  89         ret = regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
  90                                  AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1,
  91                                  val);
  92         if (ret < 0)
  93                 return ret;
  94
  95         return 0;
  96 }
  97
  98 static int ak4104_hw_params(struct snd_pcm_substream *substream,
  99                             struct snd_pcm_hw_params *params,
 100                             struct snd_soc_dai *dai)
 101 {
 102         struct snd_soc_codec *codec = dai->codec;
 103         struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
 104         int ret, val = 0;
 105
 106         /* set the IEC958 bits: consumer mode, no copyright bit */
 107         val |= IEC958_AES0_CON_NOT_COPYRIGHT;
 108         regmap_write(ak4104->regmap, AK4104_REG_CHN_STATUS(0), val);
 109
 110         val = 0;
 111
 112         switch (params_rate(params)) {
 113         case 22050:
 114                 val |= IEC958_AES3_CON_FS_22050;
 115                 break;
 116         case 24000:
 117                 val |= IEC958_AES3_CON_FS_24000;
 118                 break;
 119         case 32000:
 120                 val |= IEC958_AES3_CON_FS_32000;
 121                 break;
 122         case 44100:
 123                 val |= IEC958_AES3_CON_FS_44100;
 124                 break;
 125         case 48000:
 126                 val |= IEC958_AES3_CON_FS_48000;
 127                 break;
 128         case 88200:
 129                 val |= IEC958_AES3_CON_FS_88200;
 130                 break;
 131         case 96000:
 132                 val |= IEC958_AES3_CON_FS_96000;
 133                 break;
 134         case 176400:
 135                 val |= IEC958_AES3_CON_FS_176400;
 136                 break;
 137         case 192000:
 138                 val |= IEC958_AES3_CON_FS_192000;
 139                 break;
 140         default:
 141                 dev_err(codec->dev, "unsupported sampling rate\n");
 142                 return -EINVAL;
 143         }
 144
 145         ret = regmap_write(ak4104->regmap, AK4104_REG_CHN_STATUS(3), val);
 146         if (ret < 0)
 147                 return ret;
 148
 149         /* enable transmitter */
 150         ret = regmap_update_bits(ak4104->regmap, AK4104_REG_TX,
 151                                  AK4104_TX_TXE, AK4104_TX_TXE);
 152         if (ret < 0)
 153                 return ret;
 154
 155         return 0;
 156 }
 157
 158 static int ak4104_hw_free(struct snd_pcm_substream *substream,
 159                           struct snd_soc_dai *dai)
 160 {
 161         struct snd_soc_codec *codec = dai->codec;
 162         struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
 163
 164         /* disable transmitter */
 165         return regmap_update_bits(ak4104->regmap, AK4104_REG_TX,
 166                                   AK4104_TX_TXE, 0);
 167 }
 168
 169 static const struct snd_soc_dai_ops ak4101_dai_ops = {
 170         .hw_params = ak4104_hw_params,
 171         .hw_free = ak4104_hw_free,
 172         .set_fmt = ak4104_set_dai_fmt,
 173 };
 174
 175 static struct snd_soc_dai_driver ak4104_dai = {
 176         .name = "ak4104-hifi",
 177         .playback = {
 178                 .stream_name = "Playback",
 179                 .channels_min = 2,
 180                 .channels_max = 2,
 181                 .rates = SNDRV_PCM_RATE_8000_192000,
 182                 .formats = SNDRV_PCM_FMTBIT_S16_LE  |
 183                            SNDRV_PCM_FMTBIT_S24_3LE |
 184                            SNDRV_PCM_FMTBIT_S24_LE
 185         },
 186         .ops = &ak4101_dai_ops,
 187 };
 188
 189 static int ak4104_probe(struct snd_soc_codec *codec)
 190 {
 191         struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
 192         int ret;
 193
 194         codec->control_data = ak4104->regmap;
 195
 196         /* set power-up and non-reset bits */
 197         ret = regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
 198                                  AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN,
 199                                  AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN);
 200         if (ret < 0)
 201                 return ret;
 202
 203         /* enable transmitter */
 204         ret = regmap_update_bits(ak4104->regmap, AK4104_REG_TX,
 205                                  AK4104_TX_TXE, AK4104_TX_TXE);
 206         if (ret < 0)
 207                 return ret;
 208
 209         return 0;
 210 }
 211
 212 static int ak4104_remove(struct snd_soc_codec *codec)
 213 {
 214         struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
 215
 216         regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
 217                            AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN, 0);
 218
 219         return 0;
 220 }
 221
 222 static struct snd_soc_codec_driver soc_codec_device_ak4104 = {
 223         .probe =        ak4104_probe,
 224         .remove =       ak4104_remove,
 225
 226         .dapm_widgets = ak4104_dapm_widgets,
 227         .num_dapm_widgets = ARRAY_SIZE(ak4104_dapm_widgets),
 228         .dapm_routes = ak4104_dapm_routes,
 229         .num_dapm_routes = ARRAY_SIZE(ak4104_dapm_routes),
 230 };
 231
 232 static const struct regmap_config ak4104_regmap = {
 233         .reg_bits = 8,
 234         .val_bits = 8,
 235
 236         .max_register = AK4104_NUM_REGS - 1,
 237         .read_flag_mask = AK4104_READ,
 238         .write_flag_mask = AK4104_WRITE,
 239
 240         .cache_type = REGCACHE_RBTREE,
 241 };
 242
 243 static int ak4104_spi_probe(struct spi_device *spi)
 244 {
 245         struct device_node *np = spi->dev.of_node;
 246         struct ak4104_private *ak4104;
 247         unsigned int val;
 248         int ret;
 249
 250         spi->bits_per_word = 8;
 251         spi->mode = SPI_MODE_0;
 252         ret = spi_setup(spi);
 253         if (ret < 0)
 254                 return ret;
 255
 256         ak4104 = devm_kzalloc(&spi->dev, sizeof(struct ak4104_private),
 257                               GFP_KERNEL);
 258         if (ak4104 == NULL)
 259                 return -ENOMEM;
 260
 261         ak4104->regmap = devm_regmap_init_spi(spi, &ak4104_regmap);
 262         if (IS_ERR(ak4104->regmap)) {
 263                 ret = PTR_ERR(ak4104->regmap);
 264                 return ret;
 265         }
 266
 267         if (np) {
 268                 enum of_gpio_flags flags;
 269                 int gpio = of_get_named_gpio_flags(np, "reset-gpio", 0, &flags);
 270
 271                 if (gpio_is_valid(gpio)) {
 272                         ret = devm_gpio_request_one(&spi->dev, gpio,
 273                                      flags & OF_GPIO_ACTIVE_LOW ?
 274                                         GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH,
 275                                      "ak4104 reset");
 276                         if (ret < 0)
 277                                 return ret;
 278                 }
 279         }
 280
 281         /* read the 'reserved' register - according to the datasheet, it
 282          * should contain 0x5b. Not a good way to verify the presence of
 283          * the device, but there is no hardware ID register. */
 284         ret = regmap_read(ak4104->regmap, AK4104_REG_RESERVED, &val);
 285         if (ret != 0)
 286                 return ret;
 287         if (val != AK4104_RESERVED_VAL)
 288                 return -ENODEV;
 289
 290         spi_set_drvdata(spi, ak4104);
 291
 292         ret = snd_soc_register_codec(&spi->dev,
 293                         &soc_codec_device_ak4104, &ak4104_dai, 1);
 294         return ret;
 295 }
 296
 297 static int ak4104_spi_remove(struct spi_device *spi)
 298 {
 299         snd_soc_unregister_codec(&spi->dev);
 300         return 0;
 301 }
 302
 303 static const struct of_device_id ak4104_of_match[] = {
 304         { .compatible = "asahi-kasei,ak4104", },
 305         { }
 306 };
 307 MODULE_DEVICE_TABLE(of, ak4104_of_match);
 308
 309 static struct spi_driver ak4104_spi_driver = {
 310         .driver  = {
 311                 .name   = DRV_NAME,
 312                 .owner  = THIS_MODULE,
 313                 .of_match_table = ak4104_of_match,
 314         },
 315         .probe  = ak4104_spi_probe,
 316         .remove = ak4104_spi_remove,
 317 };
 318
 319 module_spi_driver(ak4104_spi_driver);
 320
 321 MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
 322 MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver");
 323 MODULE_LICENSE("GPL");
 324