+typedef int (*map_slave_func_t)(void *, struct snd_kcontrol *);
+
+/* apply the function to all matching slave ctls in the mixer list */
+static int map_slaves(struct hda_codec *codec, const char * const *slaves,
+ map_slave_func_t func, void *data)
+{
+ struct hda_nid_item *items;
+ const char * const *s;
+ int i, err;
+
+ items = codec->mixers.list;
+ for (i = 0; i < codec->mixers.used; i++) {
+ struct snd_kcontrol *sctl = items[i].kctl;
+ if (!sctl || !sctl->id.name ||
+ sctl->id.iface != SNDRV_CTL_ELEM_IFACE_MIXER)
+ continue;
+ for (s = slaves; *s; s++) {
+ if (!strcmp(sctl->id.name, *s)) {
+ err = func(data, sctl);
+ if (err)
+ return err;
+ break;
+ }
+ }
+ }
+ return 0;
+}
+
+static int check_slave_present(void *data, struct snd_kcontrol *sctl)
+{
+ return 1;
+}
+