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ASoC: Implement suspend and resume for WM8993

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Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
This commit is contained in:
Mark Brown 2010-01-02 13:15:56 +00:00
parent 10505634bf
commit 53242c6833
1 changed files with 67 additions and 0 deletions
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67
sound/soc/codecs/wm8993.c
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@ -227,6 +227,7 @@ struct wm8993_priv {
int class_w_users;
unsigned int fll_fref;
unsigned int fll_fout;
int fll_src;
};
static unsigned int wm8993_read_hw(struct snd_soc_codec *codec, u8 reg)
@ -506,6 +507,7 @@ static int wm8993_set_fll(struct snd_soc_dai *dai, int fll_id, int source,
wm8993->fll_fref = Fref;
wm8993->fll_fout = Fout;
wm8993->fll_src = source;
return 0;
}
@ -1480,9 +1482,74 @@ static int wm8993_remove(struct platform_device *pdev)
return 0;
}
#ifdef CONFIG_PM
static int wm8993_suspend(struct platform_device *pdev, pm_message_t state)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
struct snd_soc_codec *codec = socdev->card->codec;
struct wm8993_priv *wm8993 = codec->private_data;
int fll_fout = wm8993->fll_fout;
int fll_fref = wm8993->fll_fref;
int ret;
/* Stop the FLL in an orderly fashion */
ret = wm8993_set_fll(codec->dai, 0, 0, 0, 0);
if (ret != 0) {
dev_err(&pdev->dev, "Failed to stop FLL\n");
return ret;
}
wm8993->fll_fout = fll_fout;
wm8993->fll_fref = fll_fref;
wm8993_set_bias_level(codec, SND_SOC_BIAS_OFF);
return 0;
}
static int wm8993_resume(struct platform_device *pdev)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
struct snd_soc_codec *codec = socdev->card->codec;
struct wm8993_priv *wm8993 = codec->private_data;
u16 *cache = wm8993->reg_cache;
int i, ret;
/* Restore the register settings */
for (i = 1; i < WM8993_MAX_REGISTER; i++) {
if (cache[i] == wm8993_reg_defaults[i])
continue;
snd_soc_write(codec, i, cache[i]);
}
wm8993_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
/* Restart the FLL? */
if (wm8993->fll_fout) {
int fll_fout = wm8993->fll_fout;
int fll_fref = wm8993->fll_fref;
wm8993->fll_fref = 0;
wm8993->fll_fout = 0;
ret = wm8993_set_fll(codec->dai, 0, wm8993->fll_src,
fll_fref, fll_fout);
if (ret != 0)
dev_err(codec->dev, "Failed to restart FLL\n");
}
return 0;
}
#else
#define wm8993_suspend NULL
#define wm8993_resume NULL
#endif
struct snd_soc_codec_device soc_codec_dev_wm8993 = {
.probe = wm8993_probe,
.remove = wm8993_remove,
.suspend = wm8993_suspend,
.resume = wm8993_resume,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_wm8993);