From 0c7f46ad927cbd29965d4971730de713b478d270 Mon Sep 17 00:00:00 2001 From: Wang Xingchao Date: Wed, 6 Jun 2012 22:02:48 +0800 Subject: [PATCH] ALSA: hda - check supported power states Add function to check whether power states supported by specific codec node. Signed-off-by: Wang Xingchao Signed-off-by: Takashi Iwai --- sound/pci/hda/hda_codec.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c index 41ca803a1ff..b89c8ecc819 100644 --- a/sound/pci/hda/hda_codec.c +++ b/sound/pci/hda/hda_codec.c @@ -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 */ -- 2.41.0