[ALSA] hda-codec - Add channel-mode helper
Modules: HDA Codec driver,HDA generic driver
Add common channel-mode helper functions for all codec patches.
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 e7fb182..14a6f54 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -1662,6 +1662,54 @@
}
+ /*
+ * Channel mode helper
+ */
+int snd_hda_ch_mode_info(struct hda_codec *codec, snd_ctl_elem_info_t *uinfo,
+ const struct hda_channel_mode *chmode, int num_chmodes)
+{
+ uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
+ uinfo->count = 1;
+ uinfo->value.enumerated.items = num_chmodes;
+ if (uinfo->value.enumerated.item >= num_chmodes)
+ uinfo->value.enumerated.item = num_chmodes - 1;
+ sprintf(uinfo->value.enumerated.name, "%dch",
+ chmode[uinfo->value.enumerated.item].channels);
+ return 0;
+}
+
+int snd_hda_ch_mode_get(struct hda_codec *codec, snd_ctl_elem_value_t *ucontrol,
+ const struct hda_channel_mode *chmode, int num_chmodes,
+ int max_channels)
+{
+ int i;
+
+ for (i = 0; i < num_chmodes; i++) {
+ if (max_channels == chmode[i].channels) {
+ ucontrol->value.enumerated.item[0] = i;
+ break;
+ }
+ }
+ return 0;
+}
+
+int snd_hda_ch_mode_put(struct hda_codec *codec, snd_ctl_elem_value_t *ucontrol,
+ const struct hda_channel_mode *chmode, int num_chmodes,
+ int *max_channelsp)
+{
+ unsigned int mode;
+
+ mode = ucontrol->value.enumerated.item[0];
+ snd_assert(mode < num_chmodes, return -EINVAL);
+ if (*max_channelsp && ! codec->in_resume)
+ return 0;
+ /* change the current channel setting */
+ *max_channelsp = chmode[mode].channels;
+ if (chmode[mode].sequence)
+ snd_hda_sequence_write(codec, chmode[mode].sequence);
+ return 1;
+}
+
/*
* input MUX helper
*/