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