sound/soc/codecs/ak4104.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * AK4104 ALSA SoC (ASoC) driver
   4  *
   5  * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/slab.h>
  10 #include <linux/spi/spi.h>
  11 #include <linux/of_device.h>
  12 #include <linux/gpio/consumer.h>
  13 #include <linux/regulator/consumer.h>
  14 #include <sound/asoundef.h>
  15 #include <sound/core.h>
  16 #include <sound/soc.h>
  17 #include <sound/initval.h>
  18
  19 /* AK4104 registers addresses */
  20 #define AK4104_REG_CONTROL1             0x00
  21 #define AK4104_REG_RESERVED             0x01
  22 #define AK4104_REG_CONTROL2             0x02
  23 #define AK4104_REG_TX                   0x03
  24 #define AK4104_REG_CHN_STATUS(x)        ((x) + 0x04)
  25 #define AK4104_NUM_REGS                 10
  26
  27 #define AK4104_REG_MASK                 0x1f
  28 #define AK4104_READ                     0xc0
  29 #define AK4104_WRITE                    0xe0
  30 #define AK4104_RESERVED_VAL             0x5b
  31
  32 /* Bit masks for AK4104 registers */
  33 #define AK4104_CONTROL1_RSTN            (1 << 0)
  34 #define AK4104_CONTROL1_PW              (1 << 1)
  35 #define AK4104_CONTROL1_DIF0            (1 << 2)
  36 #define AK4104_CONTROL1_DIF1            (1 << 3)
  37
  38 #define AK4104_CONTROL2_SEL0            (1 << 0)
  39 #define AK4104_CONTROL2_SEL1            (1 << 1)
  40 #define AK4104_CONTROL2_MODE            (1 << 2)
  41
  42 #define AK4104_TX_TXE                   (1 << 0)
  43 #define AK4104_TX_V                     (1 << 1)
  44
  45 struct ak4104_private {
  46         struct regmap *regmap;
  47         struct regulator *regulator;
  48 };
  49
  50 static const struct snd_soc_dapm_widget ak4104_dapm_widgets[] = {
  51 SND_SOC_DAPM_PGA("TXE", AK4104_REG_TX, AK4104_TX_TXE, 0, NULL, 0),
  52
  53 SND_SOC_DAPM_OUTPUT("TX"),
  54 };
  55
  56 static const struct snd_soc_dapm_route ak4104_dapm_routes[] = {
  57         { "TXE", NULL, "Playback" },
  58         { "TX", NULL, "TXE" },
  59 };
  60
  61 static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai,
  62                               unsigned int format)
  63 {
  64         struct snd_soc_component *component = codec_dai->component;
  65         struct ak4104_private *ak4104 = snd_soc_component_get_drvdata(component);
  66         int val = 0;
  67         int ret;
  68
  69         /* set DAI format */
  70         switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
  71         case SND_SOC_DAIFMT_RIGHT_J:
  72                 break;
  73         case SND_SOC_DAIFMT_LEFT_J:
  74                 val |= AK4104_CONTROL1_DIF0;
  75                 break;
  76         case SND_SOC_DAIFMT_I2S:
  77                 val |= AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1;
  78                 break;
  79         default:
  80                 dev_err(component->dev, "invalid dai format\n");
  81                 return -EINVAL;
  82         }
  83
  84         /* This device can only be slave */
  85         if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS)
  86                 return -EINVAL;
  87
  88         ret = regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
  89                                  AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1,
  90                                  val);
  91         if (ret < 0)
  92                 return ret;
  93
  94         return 0;
  95 }
  96
  97 static int ak4104_hw_params(struct snd_pcm_substream *substream,
  98                             struct snd_pcm_hw_params *params,
  99                             struct snd_soc_dai *dai)
 100 {
 101         struct snd_soc_component *component = dai->component;
 102         struct ak4104_private *ak4104 = snd_soc_component_get_drvdata(component);
 103         int ret, val = 0;
 104
 105         /* set the IEC958 bits: consumer mode, no copyright bit */
 106         val |= IEC958_AES0_CON_NOT_COPYRIGHT;
 107         regmap_write(ak4104->regmap, AK4104_REG_CHN_STATUS(0), val);
 108
 109         val = 0;
 110
 111         switch (params_rate(params)) {
 112         case 22050:
 113                 val |= IEC958_AES3_CON_FS_22050;
 114                 break;
 115         case 24000:
 116                 val |= IEC958_AES3_CON_FS_24000;
 117                 break;
 118         case 32000:
 119                 val |= IEC958_AES3_CON_FS_32000;
 120                 break;
 121         case 44100:
 122                 val |= IEC958_AES3_CON_FS_44100;
 123                 break;
 124         case 48000:
 125                 val |= IEC958_AES3_CON_FS_48000;
 126                 break;
 127         case 88200:
 128                 val |= IEC958_AES3_CON_FS_88200;
 129                 break;
 130         case 96000:
 131                 val |= IEC958_AES3_CON_FS_96000;
 132                 break;
 133         case 176400:
 134                 val |= IEC958_AES3_CON_FS_176400;
 135                 break;
 136         case 192000:
 137                 val |= IEC958_AES3_CON_FS_192000;
 138                 break;
 139         default:
 140                 dev_err(component->dev, "unsupported sampling rate\n");
 141                 return -EINVAL;
 142         }
 143
 144         ret = regmap_write(ak4104->regmap, AK4104_REG_CHN_STATUS(3), val);
 145         if (ret < 0)
 146                 return ret;
 147
 148         return 0;
 149 }
 150
 151 static const struct snd_soc_dai_ops ak4101_dai_ops = {
 152         .hw_params = ak4104_hw_params,
 153         .set_fmt = ak4104_set_dai_fmt,
 154 };
 155
 156 static struct snd_soc_dai_driver ak4104_dai = {
 157         .name = "ak4104-hifi",
 158         .playback = {
 159                 .stream_name = "Playback",
 160                 .channels_min = 2,
 161                 .channels_max = 2,
 162                 .rates = SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 |
 163                          SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
 164                          SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 |
 165                          SNDRV_PCM_RATE_176400 | SNDRV_PCM_RATE_192000,
 166                 .formats = SNDRV_PCM_FMTBIT_S16_LE  |
 167                            SNDRV_PCM_FMTBIT_S24_3LE |
 168                            SNDRV_PCM_FMTBIT_S24_LE
 169         },
 170         .ops = &ak4101_dai_ops,
 171 };
 172
 173 static int ak4104_probe(struct snd_soc_component *component)
 174 {
 175         struct ak4104_private *ak4104 = snd_soc_component_get_drvdata(component);
 176         int ret;
 177
 178         ret = regulator_enable(ak4104->regulator);
 179         if (ret < 0) {
 180                 dev_err(component->dev, "Unable to enable regulator: %d\n", ret);
 181                 return ret;
 182         }
 183
 184         /* set power-up and non-reset bits */
 185         ret = regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
 186                                  AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN,
 187                                  AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN);
 188         if (ret < 0)
 189                 goto exit_disable_regulator;
 190
 191         /* enable transmitter */
 192         ret = regmap_update_bits(ak4104->regmap, AK4104_REG_TX,
 193                                  AK4104_TX_TXE, AK4104_TX_TXE);
 194         if (ret < 0)
 195                 goto exit_disable_regulator;
 196
 197         return 0;
 198
 199 exit_disable_regulator:
 200         regulator_disable(ak4104->regulator);
 201         return ret;
 202 }
 203
 204 static void ak4104_remove(struct snd_soc_component *component)
 205 {
 206         struct ak4104_private *ak4104 = snd_soc_component_get_drvdata(component);
 207
 208         regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
 209                            AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN, 0);
 210         regulator_disable(ak4104->regulator);
 211 }
 212
 213 #ifdef CONFIG_PM
 214 static int ak4104_soc_suspend(struct snd_soc_component *component)
 215 {
 216         struct ak4104_private *priv = snd_soc_component_get_drvdata(component);
 217
 218         regulator_disable(priv->regulator);
 219
 220         return 0;
 221 }
 222
 223 static int ak4104_soc_resume(struct snd_soc_component *component)
 224 {
 225         struct ak4104_private *priv = snd_soc_component_get_drvdata(component);
 226         int ret;
 227
 228         ret = regulator_enable(priv->regulator);
 229         if (ret < 0)
 230                 return ret;
 231
 232         return 0;
 233 }
 234 #else
 235 #define ak4104_soc_suspend      NULL
 236 #define ak4104_soc_resume       NULL
 237 #endif /* CONFIG_PM */
 238
 239 static const struct snd_soc_component_driver soc_component_device_ak4104 = {
 240         .probe                  = ak4104_probe,
 241         .remove                 = ak4104_remove,
 242         .suspend                = ak4104_soc_suspend,
 243         .resume                 = ak4104_soc_resume,
 244         .dapm_widgets           = ak4104_dapm_widgets,
 245         .num_dapm_widgets       = ARRAY_SIZE(ak4104_dapm_widgets),
 246         .dapm_routes            = ak4104_dapm_routes,
 247         .num_dapm_routes        = ARRAY_SIZE(ak4104_dapm_routes),
 248         .idle_bias_on           = 1,
 249         .use_pmdown_time        = 1,
 250         .endianness             = 1,
 251         .non_legacy_dai_naming  = 1,
 252 };
 253
 254 static const struct regmap_config ak4104_regmap = {
 255         .reg_bits = 8,
 256         .val_bits = 8,
 257
 258         .max_register = AK4104_NUM_REGS - 1,
 259         .read_flag_mask = AK4104_READ,
 260         .write_flag_mask = AK4104_WRITE,
 261
 262         .cache_type = REGCACHE_RBTREE,
 263 };
 264
 265 static int ak4104_spi_probe(struct spi_device *spi)
 266 {
 267         struct ak4104_private *ak4104;
 268         struct gpio_desc *reset_gpiod;
 269         unsigned int val;
 270         int ret;
 271
 272         spi->bits_per_word = 8;
 273         spi->mode = SPI_MODE_0;
 274         ret = spi_setup(spi);
 275         if (ret < 0)
 276                 return ret;
 277
 278         ak4104 = devm_kzalloc(&spi->dev, sizeof(struct ak4104_private),
 279                               GFP_KERNEL);
 280         if (ak4104 == NULL)
 281                 return -ENOMEM;
 282
 283         ak4104->regulator = devm_regulator_get(&spi->dev, "vdd");
 284         if (IS_ERR(ak4104->regulator)) {
 285                 ret = PTR_ERR(ak4104->regulator);
 286                 dev_err(&spi->dev, "Unable to get Vdd regulator: %d\n", ret);
 287                 return ret;
 288         }
 289
 290         ak4104->regmap = devm_regmap_init_spi(spi, &ak4104_regmap);
 291         if (IS_ERR(ak4104->regmap)) {
 292                 ret = PTR_ERR(ak4104->regmap);
 293                 return ret;
 294         }
 295
 296         reset_gpiod = devm_gpiod_get_optional(&spi->dev, "reset",
 297                                               GPIOD_OUT_HIGH);
 298         if (IS_ERR(reset_gpiod) &&
 299             PTR_ERR(reset_gpiod) == -EPROBE_DEFER)
 300                 return -EPROBE_DEFER;
 301
 302         /* read the 'reserved' register - according to the datasheet, it
 303          * should contain 0x5b. Not a good way to verify the presence of
 304          * the device, but there is no hardware ID register. */
 305         ret = regmap_read(ak4104->regmap, AK4104_REG_RESERVED, &val);
 306         if (ret != 0)
 307                 return ret;
 308         if (val != AK4104_RESERVED_VAL)
 309                 return -ENODEV;
 310
 311         spi_set_drvdata(spi, ak4104);
 312
 313         ret = devm_snd_soc_register_component(&spi->dev,
 314                         &soc_component_device_ak4104, &ak4104_dai, 1);
 315         return ret;
 316 }
 317
 318 static const struct of_device_id ak4104_of_match[] = {
 319         { .compatible = "asahi-kasei,ak4104", },
 320         { }
 321 };
 322 MODULE_DEVICE_TABLE(of, ak4104_of_match);
 323
 324 static const struct spi_device_id ak4104_id_table[] = {
 325         { "ak4104", 0 },
 326         { }
 327 };
 328 MODULE_DEVICE_TABLE(spi, ak4104_id_table);
 329
 330 static struct spi_driver ak4104_spi_driver = {
 331         .driver  = {
 332                 .name   = "ak4104",
 333                 .of_match_table = ak4104_of_match,
 334         },
 335         .id_table = ak4104_id_table,
 336         .probe  = ak4104_spi_probe,
 337 };
 338
 339 module_spi_driver(ak4104_spi_driver);
 340
 341 MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
 342 MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver");
 343 MODULE_LICENSE("GPL");
 344