sound/soc/soc-cache.c

   1 /*
   2  * soc-cache.c  --  ASoC register cache helpers
   3  *
   4  * Copyright 2009 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 it
   9  *  under  the terms of  the GNU General  Public License as published by the
  10  *  Free Software Foundation;  either version 2 of the  License, or (at your
  11  *  option) any later version.
  12  */
  13
  14 #include <sound/soc.h>
  15 #include <linux/export.h>
  16 #include <linux/slab.h>
  17
  18 int snd_soc_cache_init(struct snd_soc_codec *codec)
  19 {
  20         const struct snd_soc_codec_driver *codec_drv = codec->driver;
  21         size_t reg_size;
  22
  23         reg_size = codec_drv->reg_cache_size * codec_drv->reg_word_size;
  24
  25         if (!reg_size)
  26                 return 0;
  27
  28         dev_dbg(codec->dev, "ASoC: Initializing cache for %s codec\n",
  29                                 codec->component.name);
  30
  31         if (codec_drv->reg_cache_default)
  32                 codec->reg_cache = kmemdup(codec_drv->reg_cache_default,
  33                                            reg_size, GFP_KERNEL);
  34         else
  35                 codec->reg_cache = kzalloc(reg_size, GFP_KERNEL);
  36         if (!codec->reg_cache)
  37                 return -ENOMEM;
  38
  39         return 0;
  40 }
  41
  42 /*
  43  * NOTE: keep in mind that this function might be called
  44  * multiple times.
  45  */
  46 int snd_soc_cache_exit(struct snd_soc_codec *codec)
  47 {
  48         dev_dbg(codec->dev, "ASoC: Destroying cache for %s codec\n",
  49                         codec->component.name);
  50         kfree(codec->reg_cache);
  51         codec->reg_cache = NULL;
  52         return 0;
  53 }