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 <sound/core.h>
  23 #include <sound/pcm.h>
  24 #include <sound/pcm_params.h>
  25 #include <sound/soc.h>
  26 #include <sound/soc-dapm.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 intercon[] = {
  70         {"VOUTL", NULL, "DAC"},
  71         {"VOUTR", NULL, "DAC"},
  72 };
  73
  74 static int wm8728_add_widgets(struct snd_soc_codec *codec)
  75 {
  76         struct snd_soc_dapm_context *dapm = &codec->dapm;
  77
  78         snd_soc_dapm_new_controls(dapm, wm8728_dapm_widgets,
  79                                   ARRAY_SIZE(wm8728_dapm_widgets));
  80         snd_soc_dapm_add_routes(dapm, intercon, ARRAY_SIZE(intercon));
  81
  82         return 0;
  83 }
  84
  85 static int wm8728_mute(struct snd_soc_dai *dai, int mute)
  86 {
  87         struct snd_soc_codec *codec = dai->codec;
  88         u16 mute_reg = snd_soc_read(codec, WM8728_DACCTL);
  89
  90         if (mute)
  91                 snd_soc_write(codec, WM8728_DACCTL, mute_reg | 1);
  92         else
  93                 snd_soc_write(codec, WM8728_DACCTL, mute_reg & ~1);
  94
  95         return 0;
  96 }
  97
  98 static int wm8728_hw_params(struct snd_pcm_substream *substream,
  99         struct snd_pcm_hw_params *params,
 100         struct snd_soc_dai *dai)
 101 {
 102         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 103         struct snd_soc_codec *codec = rtd->codec;
 104         u16 dac = snd_soc_read(codec, WM8728_DACCTL);
 105
 106         dac &= ~0x18;
 107
 108         switch (params_format(params)) {
 109         case SNDRV_PCM_FORMAT_S16_LE:
 110                 break;
 111         case SNDRV_PCM_FORMAT_S20_3LE:
 112                 dac |= 0x10;
 113                 break;
 114         case SNDRV_PCM_FORMAT_S24_LE:
 115                 dac |= 0x08;
 116                 break;
 117         default:
 118                 return -EINVAL;
 119         }
 120
 121         snd_soc_write(codec, WM8728_DACCTL, dac);
 122
 123         return 0;
 124 }
 125
 126 static int wm8728_set_dai_fmt(struct snd_soc_dai *codec_dai,
 127                 unsigned int fmt)
 128 {
 129         struct snd_soc_codec *codec = codec_dai->codec;
 130         u16 iface = snd_soc_read(codec, WM8728_IFCTL);
 131
 132         /* Currently only I2S is supported by the driver, though the
 133          * hardware is more flexible.
 134          */
 135         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 136         case SND_SOC_DAIFMT_I2S:
 137                 iface |= 1;
 138                 break;
 139         default:
 140                 return -EINVAL;
 141         }
 142
 143         /* The hardware only support full slave mode */
 144         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 145         case SND_SOC_DAIFMT_CBS_CFS:
 146                 break;
 147         default:
 148                 return -EINVAL;
 149         }
 150
 151         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 152         case SND_SOC_DAIFMT_NB_NF:
 153                 iface &= ~0x22;
 154                 break;
 155         case SND_SOC_DAIFMT_IB_NF:
 156                 iface |=  0x20;
 157                 iface &= ~0x02;
 158                 break;
 159         case SND_SOC_DAIFMT_NB_IF:
 160                 iface |= 0x02;
 161                 iface &= ~0x20;
 162                 break;
 163         case SND_SOC_DAIFMT_IB_IF:
 164                 iface |= 0x22;
 165                 break;
 166         default:
 167                 return -EINVAL;
 168         }
 169
 170         snd_soc_write(codec, WM8728_IFCTL, iface);
 171         return 0;
 172 }
 173
 174 static int wm8728_set_bias_level(struct snd_soc_codec *codec,
 175                                  enum snd_soc_bias_level level)
 176 {
 177         u16 reg;
 178         int i;
 179
 180         switch (level) {
 181         case SND_SOC_BIAS_ON:
 182         case SND_SOC_BIAS_PREPARE:
 183         case SND_SOC_BIAS_STANDBY:
 184                 if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
 185                         /* Power everything up... */
 186                         reg = snd_soc_read(codec, WM8728_DACCTL);
 187                         snd_soc_write(codec, WM8728_DACCTL, reg & ~0x4);
 188
 189                         /* ..then sync in the register cache. */
 190                         for (i = 0; i < ARRAY_SIZE(wm8728_reg_defaults); i++)
 191                                 snd_soc_write(codec, i,
 192                                              snd_soc_read(codec, i));
 193                 }
 194                 break;
 195
 196         case SND_SOC_BIAS_OFF:
 197                 reg = snd_soc_read(codec, WM8728_DACCTL);
 198                 snd_soc_write(codec, WM8728_DACCTL, reg | 0x4);
 199                 break;
 200         }
 201         codec->dapm.bias_level = level;
 202         return 0;
 203 }
 204
 205 #define WM8728_RATES (SNDRV_PCM_RATE_8000_192000)
 206
 207 #define WM8728_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
 208         SNDRV_PCM_FMTBIT_S24_LE)
 209
 210 static struct snd_soc_dai_ops wm8728_dai_ops = {
 211         .hw_params      = wm8728_hw_params,
 212         .digital_mute   = wm8728_mute,
 213         .set_fmt        = wm8728_set_dai_fmt,
 214 };
 215
 216 static struct snd_soc_dai_driver wm8728_dai = {
 217         .name = "wm8728-hifi",
 218         .playback = {
 219                 .stream_name = "Playback",
 220                 .channels_min = 2,
 221                 .channels_max = 2,
 222                 .rates = WM8728_RATES,
 223                 .formats = WM8728_FORMATS,
 224         },
 225         .ops = &wm8728_dai_ops,
 226 };
 227
 228 static int wm8728_suspend(struct snd_soc_codec *codec, pm_message_t state)
 229 {
 230         wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);
 231
 232         return 0;
 233 }
 234
 235 static int wm8728_resume(struct snd_soc_codec *codec)
 236 {
 237         wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 238
 239         return 0;
 240 }
 241
 242 static int wm8728_probe(struct snd_soc_codec *codec)
 243 {
 244         struct wm8728_priv *wm8728 = snd_soc_codec_get_drvdata(codec);
 245         int ret;
 246
 247         ret = snd_soc_codec_set_cache_io(codec, 7, 9, wm8728->control_type);
 248         if (ret < 0) {
 249                 printk(KERN_ERR "wm8728: failed to configure cache I/O: %d\n",
 250                        ret);
 251                 return ret;
 252         }
 253
 254         /* power on device */
 255         wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 256
 257         snd_soc_add_controls(codec, wm8728_snd_controls,
 258                                 ARRAY_SIZE(wm8728_snd_controls));
 259         wm8728_add_widgets(codec);
 260
 261         return ret;
 262 }
 263
 264 static int wm8728_remove(struct snd_soc_codec *codec)
 265 {
 266         wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);
 267         return 0;
 268 }
 269
 270 static struct snd_soc_codec_driver soc_codec_dev_wm8728 = {
 271         .probe =        wm8728_probe,
 272         .remove =       wm8728_remove,
 273         .suspend =      wm8728_suspend,
 274         .resume =       wm8728_resume,
 275         .set_bias_level = wm8728_set_bias_level,
 276         .reg_cache_size = ARRAY_SIZE(wm8728_reg_defaults),
 277         .reg_word_size = sizeof(u16),
 278         .reg_cache_default = wm8728_reg_defaults,
 279 };
 280
 281 #if defined(CONFIG_SPI_MASTER)
 282 static int __devinit wm8728_spi_probe(struct spi_device *spi)
 283 {
 284         struct wm8728_priv *wm8728;
 285         int ret;
 286
 287         wm8728 = kzalloc(sizeof(struct wm8728_priv), GFP_KERNEL);
 288         if (wm8728 == NULL)
 289                 return -ENOMEM;
 290
 291         wm8728->control_type = SND_SOC_SPI;
 292         spi_set_drvdata(spi, wm8728);
 293
 294         ret = snd_soc_register_codec(&spi->dev,
 295                         &soc_codec_dev_wm8728, &wm8728_dai, 1);
 296         if (ret < 0)
 297                 kfree(wm8728);
 298         return ret;
 299 }
 300
 301 static int __devexit wm8728_spi_remove(struct spi_device *spi)
 302 {
 303         snd_soc_unregister_codec(&spi->dev);
 304         kfree(spi_get_drvdata(spi));
 305         return 0;
 306 }
 307
 308 static struct spi_driver wm8728_spi_driver = {
 309         .driver = {
 310                 .name   = "wm8728-codec",
 311                 .owner  = THIS_MODULE,
 312         },
 313         .probe          = wm8728_spi_probe,
 314         .remove         = __devexit_p(wm8728_spi_remove),
 315 };
 316 #endif /* CONFIG_SPI_MASTER */
 317
 318 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 319 static __devinit int wm8728_i2c_probe(struct i2c_client *i2c,
 320                                       const struct i2c_device_id *id)
 321 {
 322         struct wm8728_priv *wm8728;
 323         int ret;
 324
 325         wm8728 = kzalloc(sizeof(struct wm8728_priv), GFP_KERNEL);
 326         if (wm8728 == NULL)
 327                 return -ENOMEM;
 328
 329         i2c_set_clientdata(i2c, wm8728);
 330         wm8728->control_type = SND_SOC_I2C;
 331
 332         ret =  snd_soc_register_codec(&i2c->dev,
 333                         &soc_codec_dev_wm8728, &wm8728_dai, 1);
 334         if (ret < 0)
 335                 kfree(wm8728);
 336         return ret;
 337 }
 338
 339 static __devexit int wm8728_i2c_remove(struct i2c_client *client)
 340 {
 341         snd_soc_unregister_codec(&client->dev);
 342         kfree(i2c_get_clientdata(client));
 343         return 0;
 344 }
 345
 346 static const struct i2c_device_id wm8728_i2c_id[] = {
 347         { "wm8728", 0 },
 348         { }
 349 };
 350 MODULE_DEVICE_TABLE(i2c, wm8728_i2c_id);
 351
 352 static struct i2c_driver wm8728_i2c_driver = {
 353         .driver = {
 354                 .name = "wm8728-codec",
 355                 .owner = THIS_MODULE,
 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");