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ALSA: hda - check supported power states 

Add function to check whether power states supported by specific
codec node.

Signed-off-by: Wang Xingchao <xingchao.wang@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
hifive-unleashed-5.1
Wang Xingchao 2012-06-06 22:02:48 +08:00 committed by Takashi Iwai
parent 167d2d55bf
commit 0c7f46ad92
1 changed files with 16 additions and 0 deletions
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16
sound/pci/hda/hda_codec.c
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@ -3504,6 +3504,22 @@ void snd_hda_codec_set_power_to_all(struct hda_codec *codec, hda_nid_t fg,
}
EXPORT_SYMBOL_HDA(snd_hda_codec_set_power_to_all);
/*
* supported power states check
*/
static bool snd_hda_codec_get_supported_ps(struct hda_codec *codec, hda_nid_t fg,
unsigned int power_state)
{
int sup = snd_hda_param_read(codec, fg, AC_PAR_POWER_STATE);
if (sup < 0)
return false;
if (sup & power_state)
return true;
else
return false;
}
/*
* set power state of the codec
*/