ALSA: core, oxygen, virtuoso: add an enum control info helper

Introduce the helper function snd_ctl_enum_info() to fill out the
elem_info fields for an enumerated control.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 3 insertions, 1 deletions

diff --git a/include/sound/control.h b/include/sound/control.h
index 112374dc0c58..7715e6f00d38 100644
--- a/include/sound/control.h
+++ b/include/sound/control.h
@@ -160,12 +160,14 @@ static inline struct snd_ctl_elem_id *snd_ctl_build_ioff(struct snd_ctl_elem_id
 }
 
 /*
- * Frequently used control callbacks
+ * Frequently used control callbacks/helpers
  */
 int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol,
                               struct snd_ctl_elem_info *uinfo);
 int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol,
                                 struct snd_ctl_elem_info *uinfo);
+int snd_ctl_enum_info(struct snd_ctl_elem_info *info, unsigned int channels,
+                      unsigned int items, const char *const names[]);
 
 /*
  * virtual master control