[ALSA] hda-codec - Add channel-mode helper

[thirdparty/linux.git] / sound / pci / hda / hda_codec.c

diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index e7fb182f90ed546f96c95f9d67c7e7d1edb87947..14a6f5463277939131959085dd5a774684978a11 100644 (file)
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -1662,6 +1662,54 @@ int snd_hda_add_new_ctls(struct hda_codec *codec, snd_kcontrol_new_t *knew)
 }
 
 
+ /*
+ * 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
  */