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ASoC: Implement suspend and resume operations for WM9705

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Without this the WM9705 driver fails badly when resuming.

Tested-by: Russell King <linux@arm.linux.org.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Mark Brown 2009-04-02 15:49:41 +01:00
parent 4ac5c61f0f
commit 0a11b16853
1 changed files with 37 additions and 0 deletions
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37
sound/soc/codecs/wm9705.c
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@ -317,6 +317,41 @@ static int wm9705_reset(struct snd_soc_codec *codec)
return -EIO;
}
#ifdef CONFIG_PM
static int wm9705_soc_suspend(struct platform_device *pdev)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
struct snd_soc_codec *codec = socdev->card->codec;
soc_ac97_ops.write(codec->ac97, AC97_POWERDOWN, 0xffff);
return 0;
}
static int wm9705_soc_resume(struct platform_device *pdev)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
struct snd_soc_codec *codec = socdev->card->codec;
int i, ret;
u16 *cache = codec->reg_cache;
ret = wm9705_reset(codec);
if (ret < 0) {
printk(KERN_ERR "could not reset AC97 codec\n");
return ret;
}
for (i = 2; i < ARRAY_SIZE(wm9705_reg) << 1; i += 2) {
soc_ac97_ops.write(codec->ac97, i, cache[i>>1]);
}
return 0;
}
#else
#define wm9705_soc_suspend NULL
#define wm9705_soc_resume NULL
#endif
static int wm9705_soc_probe(struct platform_device *pdev)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
@ -407,6 +442,8 @@ static int wm9705_soc_remove(struct platform_device *pdev)
struct snd_soc_codec_device soc_codec_dev_wm9705 = {
.probe = wm9705_soc_probe,
.remove = wm9705_soc_remove,
.suspend = wm9705_soc_suspend,
.resume = wm9705_soc_resume,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_wm9705);