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Commit 0a11b168 authored by Mark Brown's avatar Mark Brown
Browse files

ASoC: Implement suspend and resume operations for WM9705 



Without this the WM9705 driver fails badly when resuming.

Tested-by: default avatarRussell King <linux@arm.linux.org.uk>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent 4ac5c61f

sound/soc/codecs/wm9705.c

+37 −0
Original line number Diff line number Diff line
@@ -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);