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 snd_soc_cache_init(struct snd_soc_codec * codec)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 */ snd_soc_cache_exit(struct snd_soc_codec * codec)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