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 struct ak4104_private {
  49         struct regmap *regmap;
  50 };
  51
  52 static const struct snd_soc_dapm_widget ak4104_dapm_widgets[] = {
  53 SND_SOC_DAPM_PGA("TXE", AK4104_REG_TX, AK4104_TX_TXE, 0, NULL, 0),
  54
  55 SND_SOC_DAPM_OUTPUT("TX"),
  56 };
  57
  58 static const struct snd_soc_dapm_route ak4104_dapm_routes[] = {
  59         { "TXE", NULL, "Playback" },
  60         { "TX", NULL, "TXE" },
  61 };
  62
  63 static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai,
  64                               unsigned int format)
  65 {
  66         struct snd_soc_codec *codec = codec_dai->codec;
  67         struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
  68         int val = 0;
  69         int ret;
  70
  71         /* set DAI format */
  72         switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
  73         case SND_SOC_DAIFMT_RIGHT_J:
  74                 break;
  75         case SND_SOC_DAIFMT_LEFT_J:
  76                 val |= AK4104_CONTROL1_DIF0;
  77                 break;
  78         case SND_SOC_DAIFMT_I2S:
  79                 val |= AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1;
  80                 break;
  81         default:
  82                 dev_err(codec->dev, "invalid dai format\n");
  83                 return -EINVAL;
  84         }
  85
  86         /* This device can only be slave */
  87         if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS)
  88                 return -EINVAL;
  89
  90         ret = regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
  91                                  AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1,
  92                                  val);
  93         if (ret < 0)
  94                 return ret;
  95
  96         return 0;
  97 }
  98
  99 static int ak4104_hw_params(struct snd_pcm_substream *substream,
 100                             struct snd_pcm_hw_params *params,
 101                             struct snd_soc_dai *dai)
 102 {
 103         struct snd_soc_codec *codec = dai->codec;
 104         struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
 105         int ret, val = 0;
 106
 107         /* set the IEC958 bits: consumer mode, no copyright bit */
 108         val |= IEC958_AES0_CON_NOT_COPYRIGHT;
 109         regmap_write(ak4104->regmap, AK4104_REG_CHN_STATUS(0), val);
 110
 111         val = 0;
 112
 113         switch (params_rate(params)) {
 114         case 22050:
 115                 val |= IEC958_AES3_CON_FS_22050;
 116                 break;
 117         case 24000:
 118                 val |= IEC958_AES3_CON_FS_24000;
 119                 break;
 120         case 32000:
 121                 val |= IEC958_AES3_CON_FS_32000;
 122                 break;
 123         case 44100:
 124                 val |= IEC958_AES3_CON_FS_44100;
 125                 break;
 126         case 48000:
 127                 val |= IEC958_AES3_CON_FS_48000;
 128                 break;
 129         case 88200:
 130                 val |= IEC958_AES3_CON_FS_88200;
 131                 break;
 132         case 96000:
 133                 val |= IEC958_AES3_CON_FS_96000;
 134                 break;
 135         case 176400:
 136                 val |= IEC958_AES3_CON_FS_176400;
 137                 break;
 138         case 192000:
 139                 val |= IEC958_AES3_CON_FS_192000;
 140                 break;
 141         default:
 142                 dev_err(codec->dev, "unsupported sampling rate\n");
 143                 return -EINVAL;
 144         }
 145
 146         ret = regmap_write(ak4104->regmap, AK4104_REG_CHN_STATUS(3), val);
 147         if (ret < 0)
 148                 return ret;
 149
 150         return 0;
 151 }
 152
 153 static const struct snd_soc_dai_ops ak4101_dai_ops = {
 154         .hw_params = ak4104_hw_params,
 155         .set_fmt = ak4104_set_dai_fmt,
 156 };
 157
 158 static struct snd_soc_dai_driver ak4104_dai = {
 159         .name = "ak4104-hifi",
 160         .playback = {
 161                 .stream_name = "Playback",
 162                 .channels_min = 2,
 163                 .channels_max = 2,
 164                 .rates = SNDRV_PCM_RATE_8000_192000,
 165                 .formats = SNDRV_PCM_FMTBIT_S16_LE  |
 166                            SNDRV_PCM_FMTBIT_S24_3LE |
 167                            SNDRV_PCM_FMTBIT_S24_LE
 168         },
 169         .ops = &ak4101_dai_ops,
 170 };
 171
 172 static int ak4104_probe(struct snd_soc_codec *codec)
 173 {
 174         struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
 175         int ret;
 176
 177         /* set power-up and non-reset bits */
 178         ret = regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
 179                                  AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN,
 180                                  AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN);
 181         if (ret < 0)
 182                 return ret;
 183
 184         /* enable transmitter */
 185         ret = regmap_update_bits(ak4104->regmap, AK4104_REG_TX,
 186                                  AK4104_TX_TXE, AK4104_TX_TXE);
 187         if (ret < 0)
 188                 return ret;
 189
 190         return 0;
 191 }
 192
 193 static int ak4104_remove(struct snd_soc_codec *codec)
 194 {
 195         struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
 196
 197         regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
 198                            AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN, 0);
 199
 200         return 0;
 201 }
 202
 203 static struct snd_soc_codec_driver soc_codec_device_ak4104 = {
 204         .probe =        ak4104_probe,
 205         .remove =       ak4104_remove,
 206
 207         .dapm_widgets = ak4104_dapm_widgets,
 208         .num_dapm_widgets = ARRAY_SIZE(ak4104_dapm_widgets),
 209         .dapm_routes = ak4104_dapm_routes,
 210         .num_dapm_routes = ARRAY_SIZE(ak4104_dapm_routes),
 211 };
 212
 213 static const struct regmap_config ak4104_regmap = {
 214         .reg_bits = 8,
 215         .val_bits = 8,
 216
 217         .max_register = AK4104_NUM_REGS - 1,
 218         .read_flag_mask = AK4104_READ,
 219         .write_flag_mask = AK4104_WRITE,
 220
 221         .cache_type = REGCACHE_RBTREE,
 222 };
 223
 224 static int ak4104_spi_probe(struct spi_device *spi)
 225 {
 226         struct device_node *np = spi->dev.of_node;
 227         struct ak4104_private *ak4104;
 228         unsigned int val;
 229         int ret;
 230
 231         spi->bits_per_word = 8;
 232         spi->mode = SPI_MODE_0;
 233         ret = spi_setup(spi);
 234         if (ret < 0)
 235                 return ret;
 236
 237         ak4104 = devm_kzalloc(&spi->dev, sizeof(struct ak4104_private),
 238                               GFP_KERNEL);
 239         if (ak4104 == NULL)
 240                 return -ENOMEM;
 241
 242         ak4104->regmap = devm_regmap_init_spi(spi, &ak4104_regmap);
 243         if (IS_ERR(ak4104->regmap)) {
 244                 ret = PTR_ERR(ak4104->regmap);
 245                 return ret;
 246         }
 247
 248         if (np) {
 249                 enum of_gpio_flags flags;
 250                 int gpio = of_get_named_gpio_flags(np, "reset-gpio", 0, &flags);
 251
 252                 if (gpio_is_valid(gpio)) {
 253                         ret = devm_gpio_request_one(&spi->dev, gpio,
 254                                      flags & OF_GPIO_ACTIVE_LOW ?
 255                                         GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH,
 256                                      "ak4104 reset");
 257                         if (ret < 0)
 258                                 return ret;
 259                 }
 260         }
 261
 262         /* read the 'reserved' register - according to the datasheet, it
 263          * should contain 0x5b. Not a good way to verify the presence of
 264          * the device, but there is no hardware ID register. */
 265         ret = regmap_read(ak4104->regmap, AK4104_REG_RESERVED, &val);
 266         if (ret != 0)
 267                 return ret;
 268         if (val != AK4104_RESERVED_VAL)
 269                 return -ENODEV;
 270
 271         spi_set_drvdata(spi, ak4104);
 272
 273         ret = snd_soc_register_codec(&spi->dev,
 274                         &soc_codec_device_ak4104, &ak4104_dai, 1);
 275         return ret;
 276 }
 277
 278 static int ak4104_spi_remove(struct spi_device *spi)
 279 {
 280         snd_soc_unregister_codec(&spi->dev);
 281         return 0;
 282 }
 283
 284 static const struct of_device_id ak4104_of_match[] = {
 285         { .compatible = "asahi-kasei,ak4104", },
 286         { }
 287 };
 288 MODULE_DEVICE_TABLE(of, ak4104_of_match);
 289
 290 static const struct spi_device_id ak4104_id_table[] = {
 291         { "ak4104", 0 },
 292         { }
 293 };
 294 MODULE_DEVICE_TABLE(spi, ak4104_id_table);
 295
 296 static struct spi_driver ak4104_spi_driver = {
 297         .driver  = {
 298                 .name   = "ak4104",
 299                 .owner  = THIS_MODULE,
 300                 .of_match_table = ak4104_of_match,
 301         },
 302         .id_table = ak4104_id_table,
 303         .probe  = ak4104_spi_probe,
 304         .remove = ak4104_spi_remove,
 305 };
 306
 307 module_spi_driver(ak4104_spi_driver);
 308
 309 MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
 310 MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver");
 311 MODULE_LICENSE("GPL");
 312