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/spi/spi.h>
  21 #include <linux/slab.h>
  22 #include <linux/of_device.h>
  23 #include <sound/core.h>
  24 #include <sound/pcm.h>
  25 #include <sound/pcm_params.h>
  26 #include <sound/soc.h>
  27 #include <sound/initval.h>
  28 #include <sound/tlv.h>
  29
  30 #include "wm8728.h"
  31
  32 /*
  33  * We can't read the WM8728 register space so we cache them instead.
  34  * Note that the defaults here aren't the physical defaults, we latch
  35  * the volume update bits, mute the output and enable infinite zero
  36  * detect.
  37  */
  38 static const u16 wm8728_reg_defaults[] = {
  39         0x1ff,
  40         0x1ff,
  41         0x001,
  42         0x100,
  43 };
  44
  45 /* codec private data */
  46 struct wm8728_priv {
  47         enum snd_soc_control_type control_type;
  48 };
  49
  50 static const DECLARE_TLV_DB_SCALE(wm8728_tlv, -12750, 50, 1);
  51
  52 static const struct snd_kcontrol_new wm8728_snd_controls[] = {
  53
  54 SOC_DOUBLE_R_TLV("Digital Playback Volume", WM8728_DACLVOL, WM8728_DACRVOL,
  55                  0, 255, 0, wm8728_tlv),
  56
  57 SOC_SINGLE("Deemphasis", WM8728_DACCTL, 1, 1, 0),
  58 };
  59
  60 /*
  61  * DAPM controls.
  62  */
  63 static const struct snd_soc_dapm_widget wm8728_dapm_widgets[] = {
  64 SND_SOC_DAPM_DAC("DAC", "HiFi Playback", SND_SOC_NOPM, 0, 0),
  65 SND_SOC_DAPM_OUTPUT("VOUTL"),
  66 SND_SOC_DAPM_OUTPUT("VOUTR"),
  67 };
  68
  69 static const struct snd_soc_dapm_route wm8728_intercon[] = {
  70         {"VOUTL", NULL, "DAC"},
  71         {"VOUTR", NULL, "DAC"},
  72 };
  73
  74 static int wm8728_mute(struct snd_soc_dai *dai, int mute)
  75 {
  76         struct snd_soc_codec *codec = dai->codec;
  77         u16 mute_reg = snd_soc_read(codec, WM8728_DACCTL);
  78
  79         if (mute)
  80                 snd_soc_write(codec, WM8728_DACCTL, mute_reg | 1);
  81         else
  82                 snd_soc_write(codec, WM8728_DACCTL, mute_reg & ~1);
  83
  84         return 0;
  85 }
  86
  87 static int wm8728_hw_params(struct snd_pcm_substream *substream,
  88         struct snd_pcm_hw_params *params,
  89         struct snd_soc_dai *dai)
  90 {
  91         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  92         struct snd_soc_codec *codec = rtd->codec;
  93         u16 dac = snd_soc_read(codec, WM8728_DACCTL);
  94
  95         dac &= ~0x18;
  96
  97         switch (params_format(params)) {
  98         case SNDRV_PCM_FORMAT_S16_LE:
  99                 break;
 100         case SNDRV_PCM_FORMAT_S20_3LE:
 101                 dac |= 0x10;
 102                 break;
 103         case SNDRV_PCM_FORMAT_S24_LE:
 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         u16 reg;
 167         int i;
 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                         for (i = 0; i < ARRAY_SIZE(wm8728_reg_defaults); i++)
 180                                 snd_soc_write(codec, i,
 181                                              snd_soc_read(codec, i));
 182                 }
 183                 break;
 184
 185         case SND_SOC_BIAS_OFF:
 186                 reg = snd_soc_read(codec, WM8728_DACCTL);
 187                 snd_soc_write(codec, WM8728_DACCTL, reg | 0x4);
 188                 break;
 189         }
 190         codec->dapm.bias_level = level;
 191         return 0;
 192 }
 193
 194 #define WM8728_RATES (SNDRV_PCM_RATE_8000_192000)
 195
 196 #define WM8728_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
 197         SNDRV_PCM_FMTBIT_S24_LE)
 198
 199 static struct snd_soc_dai_ops wm8728_dai_ops = {
 200         .hw_params      = wm8728_hw_params,
 201         .digital_mute   = wm8728_mute,
 202         .set_fmt        = wm8728_set_dai_fmt,
 203 };
 204
 205 static struct snd_soc_dai_driver wm8728_dai = {
 206         .name = "wm8728-hifi",
 207         .playback = {
 208                 .stream_name = "Playback",
 209                 .channels_min = 2,
 210                 .channels_max = 2,
 211                 .rates = WM8728_RATES,
 212                 .formats = WM8728_FORMATS,
 213         },
 214         .ops = &wm8728_dai_ops,
 215 };
 216
 217 static int wm8728_suspend(struct snd_soc_codec *codec, pm_message_t state)
 218 {
 219         wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);
 220
 221         return 0;
 222 }
 223
 224 static int wm8728_resume(struct snd_soc_codec *codec)
 225 {
 226         wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 227
 228         return 0;
 229 }
 230
 231 static int wm8728_probe(struct snd_soc_codec *codec)
 232 {
 233         struct wm8728_priv *wm8728 = snd_soc_codec_get_drvdata(codec);
 234         int ret;
 235
 236         ret = snd_soc_codec_set_cache_io(codec, 7, 9, wm8728->control_type);
 237         if (ret < 0) {
 238                 printk(KERN_ERR "wm8728: failed to configure cache I/O: %d\n",
 239                        ret);
 240                 return ret;
 241         }
 242
 243         /* power on device */
 244         wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 245
 246         snd_soc_add_controls(codec, wm8728_snd_controls,
 247                                 ARRAY_SIZE(wm8728_snd_controls));
 248
 249         return ret;
 250 }
 251
 252 static int wm8728_remove(struct snd_soc_codec *codec)
 253 {
 254         wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);
 255         return 0;
 256 }
 257
 258 static struct snd_soc_codec_driver soc_codec_dev_wm8728 = {
 259         .probe =        wm8728_probe,
 260         .remove =       wm8728_remove,
 261         .suspend =      wm8728_suspend,
 262         .resume =       wm8728_resume,
 263         .set_bias_level = wm8728_set_bias_level,
 264         .reg_cache_size = ARRAY_SIZE(wm8728_reg_defaults),
 265         .reg_word_size = sizeof(u16),
 266         .reg_cache_default = wm8728_reg_defaults,
 267         .dapm_widgets = wm8728_dapm_widgets,
 268         .num_dapm_widgets = ARRAY_SIZE(wm8728_dapm_widgets),
 269         .dapm_routes = wm8728_intercon,
 270         .num_dapm_routes = ARRAY_SIZE(wm8728_intercon),
 271 };
 272
 273 static const struct of_device_id wm8728_of_match[] = {
 274         { .compatible = "wlf,wm8728", },
 275         { }
 276 };
 277 MODULE_DEVICE_TABLE(of, wm8728_of_match);
 278
 279 #if defined(CONFIG_SPI_MASTER)
 280 static int __devinit wm8728_spi_probe(struct spi_device *spi)
 281 {
 282         struct wm8728_priv *wm8728;
 283         int ret;
 284
 285         wm8728 = kzalloc(sizeof(struct wm8728_priv), GFP_KERNEL);
 286         if (wm8728 == NULL)
 287                 return -ENOMEM;
 288
 289         wm8728->control_type = SND_SOC_SPI;
 290         spi_set_drvdata(spi, wm8728);
 291
 292         ret = snd_soc_register_codec(&spi->dev,
 293                         &soc_codec_dev_wm8728, &wm8728_dai, 1);
 294         if (ret < 0)
 295                 kfree(wm8728);
 296         return ret;
 297 }
 298
 299 static int __devexit wm8728_spi_remove(struct spi_device *spi)
 300 {
 301         snd_soc_unregister_codec(&spi->dev);
 302         kfree(spi_get_drvdata(spi));
 303         return 0;
 304 }
 305
 306 static struct spi_driver wm8728_spi_driver = {
 307         .driver = {
 308                 .name   = "wm8728",
 309                 .owner  = THIS_MODULE,
 310                 .of_match_table = wm8728_of_match,
 311         },
 312         .probe          = wm8728_spi_probe,
 313         .remove         = __devexit_p(wm8728_spi_remove),
 314 };
 315 #endif /* CONFIG_SPI_MASTER */
 316
 317 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 318 static __devinit int wm8728_i2c_probe(struct i2c_client *i2c,
 319                                       const struct i2c_device_id *id)
 320 {
 321         struct wm8728_priv *wm8728;
 322         int ret;
 323
 324         wm8728 = kzalloc(sizeof(struct wm8728_priv), GFP_KERNEL);
 325         if (wm8728 == NULL)
 326                 return -ENOMEM;
 327
 328         i2c_set_clientdata(i2c, wm8728);
 329         wm8728->control_type = SND_SOC_I2C;
 330
 331         ret =  snd_soc_register_codec(&i2c->dev,
 332                         &soc_codec_dev_wm8728, &wm8728_dai, 1);
 333         if (ret < 0)
 334                 kfree(wm8728);
 335         return ret;
 336 }
 337
 338 static __devexit int wm8728_i2c_remove(struct i2c_client *client)
 339 {
 340         snd_soc_unregister_codec(&client->dev);
 341         kfree(i2c_get_clientdata(client));
 342         return 0;
 343 }
 344
 345 static const struct i2c_device_id wm8728_i2c_id[] = {
 346         { "wm8728", 0 },
 347         { }
 348 };
 349 MODULE_DEVICE_TABLE(i2c, wm8728_i2c_id);
 350
 351 static struct i2c_driver wm8728_i2c_driver = {
 352         .driver = {
 353                 .name = "wm8728",
 354                 .owner = THIS_MODULE,
 355                 .of_match_table = wm8728_of_match,
 356         },
 357         .probe =    wm8728_i2c_probe,
 358         .remove =   __devexit_p(wm8728_i2c_remove),
 359         .id_table = wm8728_i2c_id,
 360 };
 361 #endif
 362
 363 static int __init wm8728_modinit(void)
 364 {
 365         int ret = 0;
 366 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 367         ret = i2c_add_driver(&wm8728_i2c_driver);
 368         if (ret != 0) {
 369                 printk(KERN_ERR "Failed to register wm8728 I2C driver: %d\n",
 370                        ret);
 371         }
 372 #endif
 373 #if defined(CONFIG_SPI_MASTER)
 374         ret = spi_register_driver(&wm8728_spi_driver);
 375         if (ret != 0) {
 376                 printk(KERN_ERR "Failed to register wm8728 SPI driver: %d\n",
 377                        ret);
 378         }
 379 #endif
 380         return ret;
 381 }
 382 module_init(wm8728_modinit);
 383
 384 static void __exit wm8728_exit(void)
 385 {
 386 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 387         i2c_del_driver(&wm8728_i2c_driver);
 388 #endif
 389 #if defined(CONFIG_SPI_MASTER)
 390         spi_unregister_driver(&wm8728_spi_driver);
 391 #endif
 392 }
 393 module_exit(wm8728_exit);
 394
 395 MODULE_DESCRIPTION("ASoC WM8728 driver");
 396 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 397 MODULE_LICENSE("GPL");