1 files changed, 48 insertions, 0 deletions

diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index e7fb182f90ed..14a6f5463277 100644
--- 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
  */