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