/*
   * soc-cache.c  --  ASoC register cache helpers
   *
   * Copyright 2009 Wolfson Microelectronics PLC.
   *
   * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   *
   *  This program is free software; you can redistribute  it and/or modify it
   *  under  the terms of  the GNU General  Public License as published by the
   *  Free Software Foundation;  either version 2 of the  License, or (at your
   *  option) any later version.
   */
  
  #include <sound/soc.h>

  #include <linux/export.h>

  #include <linux/slab.h>

  int snd_soc_cache_init(struct snd_soc_codec *codec)

  {

  	const struct snd_soc_codec_driver *codec_drv = codec->driver;

  	size_t reg_size;
  
  	reg_size = codec_drv->reg_cache_size * codec_drv->reg_word_size;

  	if (!reg_size)

  		return 0;

  	dev_dbg(codec->dev, "ASoC: Initializing cache for %s codec
  ",

  				codec->component.name);

  	if (codec_drv->reg_cache_default)
  		codec->reg_cache = kmemdup(codec_drv->reg_cache_default,

  					   reg_size, GFP_KERNEL);

  	else

  		codec->reg_cache = kzalloc(reg_size, GFP_KERNEL);

  	if (!codec->reg_cache)
  		return -ENOMEM;
  
  	return 0;
  }

  /*
   * NOTE: keep in mind that this function might be called
   * multiple times.
   */
  int snd_soc_cache_exit(struct snd_soc_codec *codec)
  {

  	dev_dbg(codec->dev, "ASoC: Destroying cache for %s codec
  ",

  			codec->component.name);

  	kfree(codec->reg_cache);
  	codec->reg_cache = NULL;
  	return 0;

  }