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 intercon[] = {
  69         {"VOUTL", NULL, "DAC"},
  70         {"VOUTR", NULL, "DAC"},
  71 };
  72
  73 static int wm8728_add_widgets(struct snd_soc_codec *codec)
  74 {
  75         struct snd_soc_dapm_context *dapm = &codec->dapm;
  76
  77         snd_soc_dapm_new_controls(dapm, wm8728_dapm_widgets,
  78                                   ARRAY_SIZE(wm8728_dapm_widgets));
  79         snd_soc_dapm_add_routes(dapm, intercon, ARRAY_SIZE(intercon));
  80
  81         return 0;
  82 }
  83
  84 static int wm8728_mute(struct snd_soc_dai *dai, int mute)
  85 {
  86         struct snd_soc_codec *codec = dai->codec;
  87         u16 mute_reg = snd_soc_read(codec, WM8728_DACCTL);
  88
  89         if (mute)
  90                 snd_soc_write(codec, WM8728_DACCTL, mute_reg | 1);
  91         else
  92                 snd_soc_write(codec, WM8728_DACCTL, mute_reg & ~1);
  93
  94         return 0;
  95 }
  96
  97 static int wm8728_hw_params(struct snd_pcm_substream *substream,
  98         struct snd_pcm_hw_params *params,
  99         struct snd_soc_dai *dai)
 100 {
 101         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 102         struct snd_soc_codec *codec = rtd->codec;
 103         u16 dac = snd_soc_read(codec, WM8728_DACCTL);
 104
 105         dac &= ~0x18;
 106
 107         switch (params_format(params)) {
 108         case SNDRV_PCM_FORMAT_S16_LE:
 109                 break;
 110         case SNDRV_PCM_FORMAT_S20_3LE:
 111                 dac |= 0x10;
 112                 break;
 113         case SNDRV_PCM_FORMAT_S24_LE:
 114                 dac |= 0x08;
 115                 break;
 116         default:
 117                 return -EINVAL;
 118         }
 119
 120         snd_soc_write(codec, WM8728_DACCTL, dac);
 121
 122         return 0;
 123 }
 124
 125 static int wm8728_set_dai_fmt(struct snd_soc_dai *codec_dai,
 126                 unsigned int fmt)
 127 {
 128         struct snd_soc_codec *codec = codec_dai->codec;
 129         u16 iface = snd_soc_read(codec, WM8728_IFCTL);
 130
 131         /* Currently only I2S is supported by the driver, though the
 132          * hardware is more flexible.
 133          */
 134         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 135         case SND_SOC_DAIFMT_I2S:
 136                 iface |= 1;
 137                 break;
 138         default:
 139                 return -EINVAL;
 140         }
 141
 142         /* The hardware only support full slave mode */
 143         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 144         case SND_SOC_DAIFMT_CBS_CFS:
 145                 break;
 146         default:
 147                 return -EINVAL;
 148         }
 149
 150         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 151         case SND_SOC_DAIFMT_NB_NF:
 152                 iface &= ~0x22;
 153                 break;
 154         case SND_SOC_DAIFMT_IB_NF:
 155                 iface |=  0x20;
 156                 iface &= ~0x02;
 157                 break;
 158         case SND_SOC_DAIFMT_NB_IF:
 159                 iface |= 0x02;
 160                 iface &= ~0x20;
 161                 break;
 162         case SND_SOC_DAIFMT_IB_IF:
 163                 iface |= 0x22;
 164                 break;
 165         default:
 166                 return -EINVAL;
 167         }
 168
 169         snd_soc_write(codec, WM8728_IFCTL, iface);
 170         return 0;
 171 }
 172
 173 static int wm8728_set_bias_level(struct snd_soc_codec *codec,
 174                                  enum snd_soc_bias_level level)
 175 {
 176         u16 reg;
 177         int i;
 178
 179         switch (level) {
 180         case SND_SOC_BIAS_ON:
 181         case SND_SOC_BIAS_PREPARE:
 182         case SND_SOC_BIAS_STANDBY:
 183                 if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
 184                         /* Power everything up... */
 185                         reg = snd_soc_read(codec, WM8728_DACCTL);
 186                         snd_soc_write(codec, WM8728_DACCTL, reg & ~0x4);
 187
 188                         /* ..then sync in the register cache. */
 189                         for (i = 0; i < ARRAY_SIZE(wm8728_reg_defaults); i++)
 190                                 snd_soc_write(codec, i,
 191                                              snd_soc_read(codec, i));
 192                 }
 193                 break;
 194
 195         case SND_SOC_BIAS_OFF:
 196                 reg = snd_soc_read(codec, WM8728_DACCTL);
 197                 snd_soc_write(codec, WM8728_DACCTL, reg | 0x4);
 198                 break;
 199         }
 200         codec->dapm.bias_level = level;
 201         return 0;
 202 }
 203
 204 #define WM8728_RATES (SNDRV_PCM_RATE_8000_192000)
 205
 206 #define WM8728_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
 207         SNDRV_PCM_FMTBIT_S24_LE)
 208
 209 static struct snd_soc_dai_ops wm8728_dai_ops = {
 210         .hw_params      = wm8728_hw_params,
 211         .digital_mute   = wm8728_mute,
 212         .set_fmt        = wm8728_set_dai_fmt,
 213 };
 214
 215 static struct snd_soc_dai_driver wm8728_dai = {
 216         .name = "wm8728-hifi",
 217         .playback = {
 218                 .stream_name = "Playback",
 219                 .channels_min = 2,
 220                 .channels_max = 2,
 221                 .rates = WM8728_RATES,
 222                 .formats = WM8728_FORMATS,
 223         },
 224         .ops = &wm8728_dai_ops,
 225 };
 226
 227 static int wm8728_suspend(struct snd_soc_codec *codec, pm_message_t state)
 228 {
 229         wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);
 230
 231         return 0;
 232 }
 233
 234 static int wm8728_resume(struct snd_soc_codec *codec)
 235 {
 236         wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 237
 238         return 0;
 239 }
 240
 241 static int wm8728_probe(struct snd_soc_codec *codec)
 242 {
 243         struct wm8728_priv *wm8728 = snd_soc_codec_get_drvdata(codec);
 244         int ret;
 245
 246         ret = snd_soc_codec_set_cache_io(codec, 7, 9, wm8728->control_type);
 247         if (ret < 0) {
 248                 printk(KERN_ERR "wm8728: failed to configure cache I/O: %d\n",
 249                        ret);
 250                 return ret;
 251         }
 252
 253         /* power on device */
 254         wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 255
 256         snd_soc_add_controls(codec, wm8728_snd_controls,
 257                                 ARRAY_SIZE(wm8728_snd_controls));
 258         wm8728_add_widgets(codec);
 259
 260         return ret;
 261 }
 262
 263 static int wm8728_remove(struct snd_soc_codec *codec)
 264 {
 265         wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);
 266         return 0;
 267 }
 268
 269 static struct snd_soc_codec_driver soc_codec_dev_wm8728 = {
 270         .probe =        wm8728_probe,
 271         .remove =       wm8728_remove,
 272         .suspend =      wm8728_suspend,
 273         .resume =       wm8728_resume,
 274         .set_bias_level = wm8728_set_bias_level,
 275         .reg_cache_size = ARRAY_SIZE(wm8728_reg_defaults),
 276         .reg_word_size = sizeof(u16),
 277         .reg_cache_default = wm8728_reg_defaults,
 278 };
 279
 280 #if defined(CONFIG_SPI_MASTER)
 281 static int __devinit wm8728_spi_probe(struct spi_device *spi)
 282 {
 283         struct wm8728_priv *wm8728;
 284         int ret;
 285
 286         wm8728 = kzalloc(sizeof(struct wm8728_priv), GFP_KERNEL);
 287         if (wm8728 == NULL)
 288                 return -ENOMEM;
 289
 290         wm8728->control_type = SND_SOC_SPI;
 291         spi_set_drvdata(spi, wm8728);
 292
 293         ret = snd_soc_register_codec(&spi->dev,
 294                         &soc_codec_dev_wm8728, &wm8728_dai, 1);
 295         if (ret < 0)
 296                 kfree(wm8728);
 297         return ret;
 298 }
 299
 300 static int __devexit wm8728_spi_remove(struct spi_device *spi)
 301 {
 302         snd_soc_unregister_codec(&spi->dev);
 303         kfree(spi_get_drvdata(spi));
 304         return 0;
 305 }
 306
 307 static struct spi_driver wm8728_spi_driver = {
 308         .driver = {
 309                 .name   = "wm8728-codec",
 310                 .owner  = THIS_MODULE,
 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-codec",
 354                 .owner = THIS_MODULE,
 355         },
 356         .probe =    wm8728_i2c_probe,
 357         .remove =   __devexit_p(wm8728_i2c_remove),
 358         .id_table = wm8728_i2c_id,
 359 };
 360 #endif
 361
 362 static int __init wm8728_modinit(void)
 363 {
 364         int ret = 0;
 365 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 366         ret = i2c_add_driver(&wm8728_i2c_driver);
 367         if (ret != 0) {
 368                 printk(KERN_ERR "Failed to register wm8728 I2C driver: %d\n",
 369                        ret);
 370         }
 371 #endif
 372 #if defined(CONFIG_SPI_MASTER)
 373         ret = spi_register_driver(&wm8728_spi_driver);
 374         if (ret != 0) {
 375                 printk(KERN_ERR "Failed to register wm8728 SPI driver: %d\n",
 376                        ret);
 377         }
 378 #endif
 379         return ret;
 380 }
 381 module_init(wm8728_modinit);
 382
 383 static void __exit wm8728_exit(void)
 384 {
 385 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 386         i2c_del_driver(&wm8728_i2c_driver);
 387 #endif
 388 #if defined(CONFIG_SPI_MASTER)
 389         spi_unregister_driver(&wm8728_spi_driver);
 390 #endif
 391 }
 392 module_exit(wm8728_exit);
 393
 394 MODULE_DESCRIPTION("ASoC WM8728 driver");
 395 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 396 MODULE_LICENSE("GPL");