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
18int 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 */
46int 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}
54