ALSA: vx: Use snd_ctl_elem_info()

... and reduce the open codes.  Also add missing const to text arrays.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/drivers/vx/vx_mixer.c

@@ -471,30 +471,18 @@ static struct snd_kcontrol_new vx_control_output_level = {
  */
 static int vx_audio_src_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
 {
-	static char *texts_mic[3] = {
+	static const char * const texts_mic[3] = {
 		"Digital", "Line", "Mic"
 	};
-	static char *texts_vx2[2] = {
+	static const char * const texts_vx2[2] = {
 		"Digital", "Analog"
 	};
 	struct vx_core *chip = snd_kcontrol_chip(kcontrol);
 
-	uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
-	uinfo->count = 1;
-	if (chip->type >= VX_TYPE_VXPOCKET) {
-		uinfo->value.enumerated.items = 3;
-		if (uinfo->value.enumerated.item > 2)
-			uinfo->value.enumerated.item = 2;
-		strcpy(uinfo->value.enumerated.name,
-		       texts_mic[uinfo->value.enumerated.item]);
-	} else {
-		uinfo->value.enumerated.items = 2;
-		if (uinfo->value.enumerated.item > 1)
-			uinfo->value.enumerated.item = 1;
-		strcpy(uinfo->value.enumerated.name,
-		       texts_vx2[uinfo->value.enumerated.item]);
-	}
-	return 0;
+	if (chip->type >= VX_TYPE_VXPOCKET)
+		return snd_ctl_enum_info(uinfo, 1, 3, texts_mic);
+	else
+		return snd_ctl_enum_info(uinfo, 1, 2, texts_vx2);
 }
 
 static int vx_audio_src_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
@@ -539,18 +527,11 @@ static struct snd_kcontrol_new vx_control_audio_src = {
  */
 static int vx_clock_mode_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
 {
-	static char *texts[3] = {
+	static const char * const texts[3] = {
 		"Auto", "Internal", "External"
 	};
 
-	uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
-	uinfo->count = 1;
-	uinfo->value.enumerated.items = 3;
-	if (uinfo->value.enumerated.item > 2)
-		uinfo->value.enumerated.item = 2;
-	strcpy(uinfo->value.enumerated.name,
-	       texts[uinfo->value.enumerated.item]);
-	return 0;
+	return snd_ctl_enum_info(uinfo, 1, 3, texts);
 }
 
 static int vx_clock_mode_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)