+/*
+ * add standard channel maps if not specified
+ */
+static int add_std_chmaps(struct hda_codec *codec)
+{
+ int i, str, err;
+
+ for (i = 0; i < codec->num_pcms; i++) {
+ for (str = 0; str < 2; str++) {
+ struct snd_pcm *pcm = codec->pcm_info[i].pcm;
+ struct hda_pcm_stream *hinfo =
+ &codec->pcm_info[i].stream[str];
+ struct snd_pcm_chmap *chmap;
+
+ if (codec->pcm_info[i].own_chmap)
+ continue;
+ if (!pcm || !hinfo->substreams)
+ continue;
+ err = snd_pcm_add_chmap_ctls(pcm, str,
+ snd_pcm_std_chmaps,
+ hinfo->channels_max,
+ 0, &chmap);
+ if (err < 0)
+ return err;
+ chmap->channel_mask = SND_PCM_CHMAP_MASK_2468;
+ }
+ }
+ return 0;
+}
+