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/initval.h>
  27 #include <sound/tlv.h>
  28
  29 #include "wm8728.h"
  30
  31 /*
  32  * We can't read the WM8728 register space so we cache them instead.
  33  * Note that the defaults here aren't the physical defaults, we latch
  34  * the volume update bits, mute the output and enable infinite zero
  35  * detect.
  36  */
  37 static const u16 wm8728_reg_defaults[] = {
  38         0x1ff,
  39         0x1ff,
  40         0x001,
  41         0x100,
  42 };
  43
  44 /* codec private data */
  45 struct wm8728_priv {
  46         enum snd_soc_control_type control_type;
  47 };
  48
  49 static const DECLARE_TLV_DB_SCALE(wm8728_tlv, -12750, 50, 1);
  50
  51 static const struct snd_kcontrol_new wm8728_snd_controls[] = {
  52
  53 SOC_DOUBLE_R_TLV("Digital Playback Volume", WM8728_DACLVOL, WM8728_DACRVOL,
  54                  0, 255, 0, wm8728_tlv),
  55
  56 SOC_SINGLE("Deemphasis", WM8728_DACCTL, 1, 1, 0),
  57 };
  58
  59 /*
  60  * DAPM controls.
  61  */
  62 static const struct snd_soc_dapm_widget wm8728_dapm_widgets[] = {
  63 SND_SOC_DAPM_DAC("DAC", "HiFi Playback", SND_SOC_NOPM, 0, 0),
  64 SND_SOC_DAPM_OUTPUT("VOUTL"),
  65 SND_SOC_DAPM_OUTPUT("VOUTR"),
  66 };
  67
  68 static const struct snd_soc_dapm_route wm8728_intercon[] = {
  69         {"VOUTL", NULL, "DAC"},
  70         {"VOUTR", NULL, "DAC"},
  71 };
  72
  73 static int wm8728_mute(struct snd_soc_dai *dai, int mute)
  74 {
  75         struct snd_soc_codec *codec = dai->codec;
  76         u16 mute_reg = snd_soc_read(codec, WM8728_DACCTL);
  77
  78         if (mute)
  79                 snd_soc_write(codec, WM8728_DACCTL, mute_reg | 1);
  80         else
  81                 snd_soc_write(codec, WM8728_DACCTL, mute_reg & ~1);
  82
  83         return 0;
  84 }
  85
  86 static int wm8728_hw_params(struct snd_pcm_substream *substream,
  87         struct snd_pcm_hw_params *params,
  88         struct snd_soc_dai *dai)
  89 {
  90         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  91         struct snd_soc_codec *codec = rtd->codec;
  92         u16 dac = snd_soc_read(codec, WM8728_DACCTL);
  93
  94         dac &= ~0x18;
  95
  96         switch (params_format(params)) {
  97         case SNDRV_PCM_FORMAT_S16_LE:
  98                 break;
  99         case SNDRV_PCM_FORMAT_S20_3LE:
 100                 dac |= 0x10;
 101                 break;
 102         case SNDRV_PCM_FORMAT_S24_LE:
 103                 dac |= 0x08;
 104                 break;
 105         default:
 106                 return -EINVAL;
 107         }
 108
 109         snd_soc_write(codec, WM8728_DACCTL, dac);
 110
 111         return 0;
 112 }
 113
 114 static int wm8728_set_dai_fmt(struct snd_soc_dai *codec_dai,
 115                 unsigned int fmt)
 116 {
 117         struct snd_soc_codec *codec = codec_dai->codec;
 118         u16 iface = snd_soc_read(codec, WM8728_IFCTL);
 119
 120         /* Currently only I2S is supported by the driver, though the
 121          * hardware is more flexible.
 122          */
 123         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 124         case SND_SOC_DAIFMT_I2S:
 125                 iface |= 1;
 126                 break;
 127         default:
 128                 return -EINVAL;
 129         }
 130
 131         /* The hardware only support full slave mode */
 132         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 133         case SND_SOC_DAIFMT_CBS_CFS:
 134                 break;
 135         default:
 136                 return -EINVAL;
 137         }
 138
 139         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 140         case SND_SOC_DAIFMT_NB_NF:
 141                 iface &= ~0x22;
 142                 break;
 143         case SND_SOC_DAIFMT_IB_NF:
 144                 iface |=  0x20;
 145                 iface &= ~0x02;
 146                 break;
 147         case SND_SOC_DAIFMT_NB_IF:
 148                 iface |= 0x02;
 149                 iface &= ~0x20;
 150                 break;
 151         case SND_SOC_DAIFMT_IB_IF:
 152                 iface |= 0x22;
 153                 break;
 154         default:
 155                 return -EINVAL;
 156         }
 157
 158         snd_soc_write(codec, WM8728_IFCTL, iface);
 159         return 0;
 160 }
 161
 162 static int wm8728_set_bias_level(struct snd_soc_codec *codec,
 163                                  enum snd_soc_bias_level level)
 164 {
 165         u16 reg;
 166         int i;
 167
 168         switch (level) {
 169         case SND_SOC_BIAS_ON:
 170         case SND_SOC_BIAS_PREPARE:
 171         case SND_SOC_BIAS_STANDBY:
 172                 if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
 173                         /* Power everything up... */
 174                         reg = snd_soc_read(codec, WM8728_DACCTL);
 175                         snd_soc_write(codec, WM8728_DACCTL, reg & ~0x4);
 176
 177                         /* ..then sync in the register cache. */
 178                         for (i = 0; i < ARRAY_SIZE(wm8728_reg_defaults); i++)
 179                                 snd_soc_write(codec, i,
 180                                              snd_soc_read(codec, i));
 181                 }
 182                 break;
 183
 184         case SND_SOC_BIAS_OFF:
 185                 reg = snd_soc_read(codec, WM8728_DACCTL);
 186                 snd_soc_write(codec, WM8728_DACCTL, reg | 0x4);
 187                 break;
 188         }
 189         codec->dapm.bias_level = level;
 190         return 0;
 191 }
 192
 193 #define WM8728_RATES (SNDRV_PCM_RATE_8000_192000)
 194
 195 #define WM8728_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
 196         SNDRV_PCM_FMTBIT_S24_LE)
 197
 198 static struct snd_soc_dai_ops wm8728_dai_ops = {
 199         .hw_params      = wm8728_hw_params,
 200         .digital_mute   = wm8728_mute,
 201         .set_fmt        = wm8728_set_dai_fmt,
 202 };
 203
 204 static struct snd_soc_dai_driver wm8728_dai = {
 205         .name = "wm8728-hifi",
 206         .playback = {
 207                 .stream_name = "Playback",
 208                 .channels_min = 2,
 209                 .channels_max = 2,
 210                 .rates = WM8728_RATES,
 211                 .formats = WM8728_FORMATS,
 212         },
 213         .ops = &wm8728_dai_ops,
 214 };
 215
 216 static int wm8728_suspend(struct snd_soc_codec *codec, pm_message_t state)
 217 {
 218         wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);
 219
 220         return 0;
 221 }
 222
 223 static int wm8728_resume(struct snd_soc_codec *codec)
 224 {
 225         wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 226
 227         return 0;
 228 }
 229
 230 static int wm8728_probe(struct snd_soc_codec *codec)
 231 {
 232         struct wm8728_priv *wm8728 = snd_soc_codec_get_drvdata(codec);
 233         int ret;
 234
 235         ret = snd_soc_codec_set_cache_io(codec, 7, 9, wm8728->control_type);
 236         if (ret < 0) {
 237                 printk(KERN_ERR "wm8728: failed to configure cache I/O: %d\n",
 238                        ret);
 239                 return ret;
 240         }
 241
 242         /* power on device */
 243         wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 244
 245         snd_soc_add_controls(codec, wm8728_snd_controls,
 246                                 ARRAY_SIZE(wm8728_snd_controls));
 247
 248         return ret;
 249 }
 250
 251 static int wm8728_remove(struct snd_soc_codec *codec)
 252 {
 253         wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);
 254         return 0;
 255 }
 256
 257 static struct snd_soc_codec_driver soc_codec_dev_wm8728 = {
 258         .probe =        wm8728_probe,
 259         .remove =       wm8728_remove,
 260         .suspend =      wm8728_suspend,
 261         .resume =       wm8728_resume,
 262         .set_bias_level = wm8728_set_bias_level,
 263         .reg_cache_size = ARRAY_SIZE(wm8728_reg_defaults),
 264         .reg_word_size = sizeof(u16),
 265         .reg_cache_default = wm8728_reg_defaults,
 266         .dapm_widgets = wm8728_dapm_widgets,
 267         .num_dapm_widgets = ARRAY_SIZE(wm8728_dapm_widgets),
 268         .dapm_routes = wm8728_intercon,
 269         .num_dapm_routes = ARRAY_SIZE(wm8728_intercon),
 270 };
 271
 272 #if defined(CONFIG_SPI_MASTER)
 273 static int __devinit wm8728_spi_probe(struct spi_device *spi)
 274 {
 275         struct wm8728_priv *wm8728;
 276         int ret;
 277
 278         wm8728 = kzalloc(sizeof(struct wm8728_priv), GFP_KERNEL);
 279         if (wm8728 == NULL)
 280                 return -ENOMEM;
 281
 282         wm8728->control_type = SND_SOC_SPI;
 283         spi_set_drvdata(spi, wm8728);
 284
 285         ret = snd_soc_register_codec(&spi->dev,
 286                         &soc_codec_dev_wm8728, &wm8728_dai, 1);
 287         if (ret < 0)
 288                 kfree(wm8728);
 289         return ret;
 290 }
 291
 292 static int __devexit wm8728_spi_remove(struct spi_device *spi)
 293 {
 294         snd_soc_unregister_codec(&spi->dev);
 295         kfree(spi_get_drvdata(spi));
 296         return 0;
 297 }
 298
 299 static struct spi_driver wm8728_spi_driver = {
 300         .driver = {
 301                 .name   = "wm8728-codec",
 302                 .owner  = THIS_MODULE,
 303         },
 304         .probe          = wm8728_spi_probe,
 305         .remove         = __devexit_p(wm8728_spi_remove),
 306 };
 307 #endif /* CONFIG_SPI_MASTER */
 308
 309 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 310 static __devinit int wm8728_i2c_probe(struct i2c_client *i2c,
 311                                       const struct i2c_device_id *id)
 312 {
 313         struct wm8728_priv *wm8728;
 314         int ret;
 315
 316         wm8728 = kzalloc(sizeof(struct wm8728_priv), GFP_KERNEL);
 317         if (wm8728 == NULL)
 318                 return -ENOMEM;
 319
 320         i2c_set_clientdata(i2c, wm8728);
 321         wm8728->control_type = SND_SOC_I2C;
 322
 323         ret =  snd_soc_register_codec(&i2c->dev,
 324                         &soc_codec_dev_wm8728, &wm8728_dai, 1);
 325         if (ret < 0)
 326                 kfree(wm8728);
 327         return ret;
 328 }
 329
 330 static __devexit int wm8728_i2c_remove(struct i2c_client *client)
 331 {
 332         snd_soc_unregister_codec(&client->dev);
 333         kfree(i2c_get_clientdata(client));
 334         return 0;
 335 }
 336
 337 static const struct i2c_device_id wm8728_i2c_id[] = {
 338         { "wm8728", 0 },
 339         { }
 340 };
 341 MODULE_DEVICE_TABLE(i2c, wm8728_i2c_id);
 342
 343 static struct i2c_driver wm8728_i2c_driver = {
 344         .driver = {
 345                 .name = "wm8728-codec",
 346                 .owner = THIS_MODULE,
 347         },
 348         .probe =    wm8728_i2c_probe,
 349         .remove =   __devexit_p(wm8728_i2c_remove),
 350         .id_table = wm8728_i2c_id,
 351 };
 352 #endif
 353
 354 static int __init wm8728_modinit(void)
 355 {
 356         int ret = 0;
 357 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 358         ret = i2c_add_driver(&wm8728_i2c_driver);
 359         if (ret != 0) {
 360                 printk(KERN_ERR "Failed to register wm8728 I2C driver: %d\n",
 361                        ret);
 362         }
 363 #endif
 364 #if defined(CONFIG_SPI_MASTER)
 365         ret = spi_register_driver(&wm8728_spi_driver);
 366         if (ret != 0) {
 367                 printk(KERN_ERR "Failed to register wm8728 SPI driver: %d\n",
 368                        ret);
 369         }
 370 #endif
 371         return ret;
 372 }
 373 module_init(wm8728_modinit);
 374
 375 static void __exit wm8728_exit(void)
 376 {
 377 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 378         i2c_del_driver(&wm8728_i2c_driver);
 379 #endif
 380 #if defined(CONFIG_SPI_MASTER)
 381         spi_unregister_driver(&wm8728_spi_driver);
 382 #endif
 383 }
 384 module_exit(wm8728_exit);
 385
 386 MODULE_DESCRIPTION("ASoC WM8728 driver");
 387 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 388 MODULE_LICENSE("GPL");