kernel/sound/soc/codecs/wm8728.c

   1 /*
   2  * wm8728.c  --  WM8728 ALSA SoC Audio driver
   3  *
   4  * Copyright 2008 Wolfson Microelectronics plc
   5  *
   6  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/moduleparam.h>
  15 #include <linux/init.h>
  16 #include <linux/delay.h>
  17 #include <linux/pm.h>
  18 #include <linux/i2c.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/regmap.h>
  21 #include <linux/spi/spi.h>
  22 #include <linux/slab.h>
  23 #include <linux/of_device.h>
  24 #include <sound/core.h>
  25 #include <sound/pcm.h>
  26 #include <sound/pcm_params.h>
  27 #include <sound/soc.h>
  28 #include <sound/initval.h>
  29 #include <sound/tlv.h>
  30
  31 #include "wm8728.h"
  32
  33 /*
  34  * We can't read the WM8728 register space so we cache them instead.
  35  * Note that the defaults here aren't the physical defaults, we latch
  36  * the volume update bits, mute the output and enable infinite zero
  37  * detect.
  38  */
  39 static const struct reg_default wm8728_reg_defaults[] = {
  40         { 0, 0x1ff },
  41         { 1, 0x1ff },
  42         { 2, 0x001 },
  43         { 3, 0x100 },
  44 };
  45
  46 /* codec private data */
  47 struct wm8728_priv {
  48         struct regmap *regmap;
  49 };
  50
  51 static const DECLARE_TLV_DB_SCALE(wm8728_tlv, -12750, 50, 1);
  52
  53 static const struct snd_kcontrol_new wm8728_snd_controls[] = {
  54
  55 SOC_DOUBLE_R_TLV("Digital Playback Volume", WM8728_DACLVOL, WM8728_DACRVOL,
  56                  0, 255, 0, wm8728_tlv),
  57
  58 SOC_SINGLE("Deemphasis", WM8728_DACCTL, 1, 1, 0),
  59 };
  60
  61 /*
  62  * DAPM controls.
  63  */
  64 static const struct snd_soc_dapm_widget wm8728_dapm_widgets[] = {
  65 SND_SOC_DAPM_DAC("DAC", "HiFi Playback", SND_SOC_NOPM, 0, 0),
  66 SND_SOC_DAPM_OUTPUT("VOUTL"),
  67 SND_SOC_DAPM_OUTPUT("VOUTR"),
  68 };
  69
  70 static const struct snd_soc_dapm_route wm8728_intercon[] = {
  71         {"VOUTL", NULL, "DAC"},
  72         {"VOUTR", NULL, "DAC"},
  73 };
  74
  75 static int wm8728_mute(struct snd_soc_dai *dai, int mute)
  76 {
  77         struct snd_soc_codec *codec = dai->codec;
  78         u16 mute_reg = snd_soc_read(codec, WM8728_DACCTL);
  79
  80         if (mute)
  81                 snd_soc_write(codec, WM8728_DACCTL, mute_reg | 1);
  82         else
  83                 snd_soc_write(codec, WM8728_DACCTL, mute_reg & ~1);
  84
  85         return 0;
  86 }
  87
  88 static int wm8728_hw_params(struct snd_pcm_substream *substream,
  89         struct snd_pcm_hw_params *params,
  90         struct snd_soc_dai *dai)
  91 {
  92         struct snd_soc_codec *codec = dai->codec;
  93         u16 dac = snd_soc_read(codec, WM8728_DACCTL);
  94
  95         dac &= ~0x18;
  96
  97         switch (params_width(params)) {
  98         case 16:
  99                 break;
 100         case 20:
 101                 dac |= 0x10;
 102                 break;
 103         case 24:
 104                 dac |= 0x08;
 105                 break;
 106         default:
 107                 return -EINVAL;
 108         }
 109
 110         snd_soc_write(codec, WM8728_DACCTL, dac);
 111
 112         return 0;
 113 }
 114
 115 static int wm8728_set_dai_fmt(struct snd_soc_dai *codec_dai,
 116                 unsigned int fmt)
 117 {
 118         struct snd_soc_codec *codec = codec_dai->codec;
 119         u16 iface = snd_soc_read(codec, WM8728_IFCTL);
 120
 121         /* Currently only I2S is supported by the driver, though the
 122          * hardware is more flexible.
 123          */
 124         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 125         case SND_SOC_DAIFMT_I2S:
 126                 iface |= 1;
 127                 break;
 128         default:
 129                 return -EINVAL;
 130         }
 131
 132         /* The hardware only support full slave mode */
 133         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 134         case SND_SOC_DAIFMT_CBS_CFS:
 135                 break;
 136         default:
 137                 return -EINVAL;
 138         }
 139
 140         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 141         case SND_SOC_DAIFMT_NB_NF:
 142                 iface &= ~0x22;
 143                 break;
 144         case SND_SOC_DAIFMT_IB_NF:
 145                 iface |=  0x20;
 146                 iface &= ~0x02;
 147                 break;
 148         case SND_SOC_DAIFMT_NB_IF:
 149                 iface |= 0x02;
 150                 iface &= ~0x20;
 151                 break;
 152         case SND_SOC_DAIFMT_IB_IF:
 153                 iface |= 0x22;
 154                 break;
 155         default:
 156                 return -EINVAL;
 157         }
 158
 159         snd_soc_write(codec, WM8728_IFCTL, iface);
 160         return 0;
 161 }
 162
 163 static int wm8728_set_bias_level(struct snd_soc_codec *codec,
 164                                  enum snd_soc_bias_level level)
 165 {
 166         struct wm8728_priv *wm8728 = snd_soc_codec_get_drvdata(codec);
 167         u16 reg;
 168
 169         switch (level) {
 170         case SND_SOC_BIAS_ON:
 171         case SND_SOC_BIAS_PREPARE:
 172         case SND_SOC_BIAS_STANDBY:
 173                 if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
 174                         /* Power everything up... */
 175                         reg = snd_soc_read(codec, WM8728_DACCTL);
 176                         snd_soc_write(codec, WM8728_DACCTL, reg & ~0x4);
 177
 178                         /* ..then sync in the register cache. */
 179                         regcache_sync(wm8728->regmap);
 180                 }
 181                 break;
 182
 183         case SND_SOC_BIAS_OFF:
 184                 reg = snd_soc_read(codec, WM8728_DACCTL);
 185                 snd_soc_write(codec, WM8728_DACCTL, reg | 0x4);
 186                 break;
 187         }
 188         codec->dapm.bias_level = level;
 189         return 0;
 190 }
 191
 192 #define WM8728_RATES (SNDRV_PCM_RATE_8000_192000)
 193
 194 #define WM8728_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
 195         SNDRV_PCM_FMTBIT_S24_LE)
 196
 197 static const struct snd_soc_dai_ops wm8728_dai_ops = {
 198         .hw_params      = wm8728_hw_params,
 199         .digital_mute   = wm8728_mute,
 200         .set_fmt        = wm8728_set_dai_fmt,
 201 };
 202
 203 static struct snd_soc_dai_driver wm8728_dai = {
 204         .name = "wm8728-hifi",
 205         .playback = {
 206                 .stream_name = "Playback",
 207                 .channels_min = 2,
 208                 .channels_max = 2,
 209                 .rates = WM8728_RATES,
 210                 .formats = WM8728_FORMATS,
 211         },
 212         .ops = &wm8728_dai_ops,
 213 };
 214
 215 static struct snd_soc_codec_driver soc_codec_dev_wm8728 = {
 216         .set_bias_level = wm8728_set_bias_level,
 217         .suspend_bias_off = true,
 218
 219         .controls = wm8728_snd_controls,
 220         .num_controls = ARRAY_SIZE(wm8728_snd_controls),
 221         .dapm_widgets = wm8728_dapm_widgets,
 222         .num_dapm_widgets = ARRAY_SIZE(wm8728_dapm_widgets),
 223         .dapm_routes = wm8728_intercon,
 224         .num_dapm_routes = ARRAY_SIZE(wm8728_intercon),
 225 };
 226
 227 static const struct of_device_id wm8728_of_match[] = {
 228         { .compatible = "wlf,wm8728", },
 229         { }
 230 };
 231 MODULE_DEVICE_TABLE(of, wm8728_of_match);
 232
 233 static const struct regmap_config wm8728_regmap = {
 234         .reg_bits = 7,
 235         .val_bits = 9,
 236         .max_register = WM8728_IFCTL,
 237
 238         .reg_defaults = wm8728_reg_defaults,
 239         .num_reg_defaults = ARRAY_SIZE(wm8728_reg_defaults),
 240         .cache_type = REGCACHE_RBTREE,
 241 };
 242
 243 #if defined(CONFIG_SPI_MASTER)
 244 static int wm8728_spi_probe(struct spi_device *spi)
 245 {
 246         struct wm8728_priv *wm8728;
 247         int ret;
 248
 249         wm8728 = devm_kzalloc(&spi->dev, sizeof(struct wm8728_priv),
 250                               GFP_KERNEL);
 251         if (wm8728 == NULL)
 252                 return -ENOMEM;
 253
 254         wm8728->regmap = devm_regmap_init_spi(spi, &wm8728_regmap);
 255         if (IS_ERR(wm8728->regmap))
 256                 return PTR_ERR(wm8728->regmap);
 257
 258         spi_set_drvdata(spi, wm8728);
 259
 260         ret = snd_soc_register_codec(&spi->dev,
 261                         &soc_codec_dev_wm8728, &wm8728_dai, 1);
 262
 263         return ret;
 264 }
 265
 266 static int wm8728_spi_remove(struct spi_device *spi)
 267 {
 268         snd_soc_unregister_codec(&spi->dev);
 269
 270         return 0;
 271 }
 272
 273 static struct spi_driver wm8728_spi_driver = {
 274         .driver = {
 275                 .name   = "wm8728",
 276                 .owner  = THIS_MODULE,
 277                 .of_match_table = wm8728_of_match,
 278         },
 279         .probe          = wm8728_spi_probe,
 280         .remove         = wm8728_spi_remove,
 281 };
 282 #endif /* CONFIG_SPI_MASTER */
 283
 284 #if IS_ENABLED(CONFIG_I2C)
 285 static int wm8728_i2c_probe(struct i2c_client *i2c,
 286                             const struct i2c_device_id *id)
 287 {
 288         struct wm8728_priv *wm8728;
 289         int ret;
 290
 291         wm8728 = devm_kzalloc(&i2c->dev, sizeof(struct wm8728_priv),
 292                               GFP_KERNEL);
 293         if (wm8728 == NULL)
 294                 return -ENOMEM;
 295
 296         wm8728->regmap = devm_regmap_init_i2c(i2c, &wm8728_regmap);
 297         if (IS_ERR(wm8728->regmap))
 298                 return PTR_ERR(wm8728->regmap);
 299
 300         i2c_set_clientdata(i2c, wm8728);
 301
 302         ret =  snd_soc_register_codec(&i2c->dev,
 303                         &soc_codec_dev_wm8728, &wm8728_dai, 1);
 304
 305         return ret;
 306 }
 307
 308 static int wm8728_i2c_remove(struct i2c_client *client)
 309 {
 310         snd_soc_unregister_codec(&client->dev);
 311         return 0;
 312 }
 313
 314 static const struct i2c_device_id wm8728_i2c_id[] = {
 315         { "wm8728", 0 },
 316         { }
 317 };
 318 MODULE_DEVICE_TABLE(i2c, wm8728_i2c_id);
 319
 320 static struct i2c_driver wm8728_i2c_driver = {
 321         .driver = {
 322                 .name = "wm8728",
 323                 .owner = THIS_MODULE,
 324                 .of_match_table = wm8728_of_match,
 325         },
 326         .probe =    wm8728_i2c_probe,
 327         .remove =   wm8728_i2c_remove,
 328         .id_table = wm8728_i2c_id,
 329 };
 330 #endif
 331
 332 static int __init wm8728_modinit(void)
 333 {
 334         int ret = 0;
 335 #if IS_ENABLED(CONFIG_I2C)
 336         ret = i2c_add_driver(&wm8728_i2c_driver);
 337         if (ret != 0) {
 338                 printk(KERN_ERR "Failed to register wm8728 I2C driver: %d\n",
 339                        ret);
 340         }
 341 #endif
 342 #if defined(CONFIG_SPI_MASTER)
 343         ret = spi_register_driver(&wm8728_spi_driver);
 344         if (ret != 0) {
 345                 printk(KERN_ERR "Failed to register wm8728 SPI driver: %d\n",
 346                        ret);
 347         }
 348 #endif
 349         return ret;
 350 }
 351 module_init(wm8728_modinit);
 352
 353 static void __exit wm8728_exit(void)
 354 {
 355 #if IS_ENABLED(CONFIG_I2C)
 356         i2c_del_driver(&wm8728_i2c_driver);
 357 #endif
 358 #if defined(CONFIG_SPI_MASTER)
 359         spi_unregister_driver(&wm8728_spi_driver);
 360 #endif
 361 }
 362 module_exit(wm8728_exit);
 363
 364 MODULE_DESCRIPTION("ASoC WM8728 driver");
 365 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 366 MODULE_LICENSE("GPL");