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>
diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index 41ca803..b89c8ec 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -3505,6 +3505,22 @@
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
*/
static void hda_set_power_state(struct hda_codec *codec, hda_nid_t fg,