ALSA: usb-audio: use enum control info helper

Simplify info callbacks by using the snd_ctl_enum_info() helper function.

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

1 files changed, 2 insertions, 9 deletions

diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index f2d74d654b3c..7df89b3d7ded 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -1633,18 +1633,11 @@ static int parse_audio_extension_unit(struct mixer_build *state, int unitid, voi
 static int mixer_ctl_selector_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
 {
         struct usb_mixer_elem_info *cval = kcontrol->private_data;
-        char **itemlist = (char **)kcontrol->private_value;
+        const char **itemlist = (const char **)kcontrol->private_value;
 
         if (snd_BUG_ON(!itemlist))
                 return -EINVAL;
-        uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
-        uinfo->count = 1;
-        uinfo->value.enumerated.items = cval->max;
-        if (uinfo->value.enumerated.item >= cval->max)
-                uinfo->value.enumerated.item = cval->max - 1;
-        strlcpy(uinfo->value.enumerated.name, itemlist[uinfo->value.enumerated.item],
-                sizeof(uinfo->value.enumerated.name));
-        return 0;
+        return snd_ctl_enum_info(uinfo, 1, cval->max, itemlist);
 }
 
 /* get callback for selector unit */