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_codec *codec = dai->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 const 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)
 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         return ret;
 246 }
 247
 248 static int wm8728_remove(struct snd_soc_codec *codec)
 249 {
 250         wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);
 251         return 0;
 252 }
 253
 254 static struct snd_soc_codec_driver soc_codec_dev_wm8728 = {
 255         .probe =        wm8728_probe,
 256         .remove =       wm8728_remove,
 257         .suspend =      wm8728_suspend,
 258         .resume =       wm8728_resume,
 259         .set_bias_level = wm8728_set_bias_level,
 260         .reg_cache_size = ARRAY_SIZE(wm8728_reg_defaults),
 261         .reg_word_size = sizeof(u16),
 262         .reg_cache_default = wm8728_reg_defaults,
 263         .controls = wm8728_snd_controls,
 264         .num_controls = ARRAY_SIZE(wm8728_snd_controls),
 265         .dapm_widgets = wm8728_dapm_widgets,
 266         .num_dapm_widgets = ARRAY_SIZE(wm8728_dapm_widgets),
 267         .dapm_routes = wm8728_intercon,
 268         .num_dapm_routes = ARRAY_SIZE(wm8728_intercon),
 269 };
 270
 271 static const struct of_device_id wm8728_of_match[] = {
 272         { .compatible = "wlf,wm8728", },
 273         { }
 274 };
 275 MODULE_DEVICE_TABLE(of, wm8728_of_match);
 276
 277 #if defined(CONFIG_SPI_MASTER)
 278 static int __devinit wm8728_spi_probe(struct spi_device *spi)
 279 {
 280         struct wm8728_priv *wm8728;
 281         int ret;
 282
 283         wm8728 = kzalloc(sizeof(struct wm8728_priv), GFP_KERNEL);
 284         if (wm8728 == NULL)
 285                 return -ENOMEM;
 286
 287         wm8728->control_type = SND_SOC_SPI;
 288         spi_set_drvdata(spi, wm8728);
 289
 290         ret = snd_soc_register_codec(&spi->dev,
 291                         &soc_codec_dev_wm8728, &wm8728_dai, 1);
 292         if (ret < 0)
 293                 kfree(wm8728);
 294         return ret;
 295 }
 296
 297 static int __devexit wm8728_spi_remove(struct spi_device *spi)
 298 {
 299         snd_soc_unregister_codec(&spi->dev);
 300         kfree(spi_get_drvdata(spi));
 301         return 0;
 302 }
 303
 304 static struct spi_driver wm8728_spi_driver = {
 305         .driver = {
 306                 .name   = "wm8728",
 307                 .owner  = THIS_MODULE,
 308                 .of_match_table = wm8728_of_match,
 309         },
 310         .probe          = wm8728_spi_probe,
 311         .remove         = __devexit_p(wm8728_spi_remove),
 312 };
 313 #endif /* CONFIG_SPI_MASTER */
 314
 315 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 316 static __devinit int wm8728_i2c_probe(struct i2c_client *i2c,
 317                                       const struct i2c_device_id *id)
 318 {
 319         struct wm8728_priv *wm8728;
 320         int ret;
 321
 322         wm8728 = kzalloc(sizeof(struct wm8728_priv), GFP_KERNEL);
 323         if (wm8728 == NULL)
 324                 return -ENOMEM;
 325
 326         i2c_set_clientdata(i2c, wm8728);
 327         wm8728->control_type = SND_SOC_I2C;
 328
 329         ret =  snd_soc_register_codec(&i2c->dev,
 330                         &soc_codec_dev_wm8728, &wm8728_dai, 1);
 331         if (ret < 0)
 332                 kfree(wm8728);
 333         return ret;
 334 }
 335
 336 static __devexit int wm8728_i2c_remove(struct i2c_client *client)
 337 {
 338         snd_soc_unregister_codec(&client->dev);
 339         kfree(i2c_get_clientdata(client));
 340         return 0;
 341 }
 342
 343 static const struct i2c_device_id wm8728_i2c_id[] = {
 344         { "wm8728", 0 },
 345         { }
 346 };
 347 MODULE_DEVICE_TABLE(i2c, wm8728_i2c_id);
 348
 349 static struct i2c_driver wm8728_i2c_driver = {
 350         .driver = {
 351                 .name = "wm8728",
 352                 .owner = THIS_MODULE,
 353                 .of_match_table = wm8728_of_match,
 354         },
 355         .probe =    wm8728_i2c_probe,
 356         .remove =   __devexit_p(wm8728_i2c_remove),
 357         .id_table = wm8728_i2c_id,
 358 };
 359 #endif
 360
 361 static int __init wm8728_modinit(void)
 362 {
 363         int ret = 0;
 364 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 365         ret = i2c_add_driver(&wm8728_i2c_driver);
 366         if (ret != 0) {
 367                 printk(KERN_ERR "Failed to register wm8728 I2C driver: %d\n",
 368                        ret);
 369         }
 370 #endif
 371 #if defined(CONFIG_SPI_MASTER)
 372         ret = spi_register_driver(&wm8728_spi_driver);
 373         if (ret != 0) {
 374                 printk(KERN_ERR "Failed to register wm8728 SPI driver: %d\n",
 375                        ret);
 376         }
 377 #endif
 378         return ret;
 379 }
 380 module_init(wm8728_modinit);
 381
 382 static void __exit wm8728_exit(void)
 383 {
 384 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 385         i2c_del_driver(&wm8728_i2c_driver);
 386 #endif
 387 #if defined(CONFIG_SPI_MASTER)
 388         spi_unregister_driver(&wm8728_spi_driver);
 389 #endif
 390 }
 391 module_exit(wm8728_exit);
 392
 393 MODULE_DESCRIPTION("ASoC WM8728 driver");
 394 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 395 MODULE_LICENSE("GPL");