ALSA: hda - Add a helper function for simple enum kcontrols

The same type of code is being used in multiple places in various
codec drivers, so put it as a core library.

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

sound/pci/hda/hda_codec.c

@@ -4791,6 +4791,34 @@ int snd_hda_input_mux_put(struct hda_codec *codec,
 EXPORT_SYMBOL_HDA(snd_hda_input_mux_put);
 
 
+/*
+ * process kcontrol info callback of a simple string enum array
+ * when @num_items is 0 or @texts is NULL, assume a boolean enum array
+ */
+int snd_hda_enum_helper_info(struct snd_kcontrol *kcontrol,
+			     struct snd_ctl_elem_info *uinfo,
+			     int num_items, const char * const *texts)
+{
+	static const char * const texts_default[] = {
+		"Disabled", "Enabled"
+	};
+
+	if (!texts || !num_items) {
+		num_items = 2;
+		texts = texts_default;
+	}
+
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
+	uinfo->count = 1;
+	uinfo->value.enumerated.items = num_items;
+	if (uinfo->value.enumerated.item >= uinfo->value.enumerated.items)
+		uinfo->value.enumerated.item = uinfo->value.enumerated.items - 1;
+	strcpy(uinfo->value.enumerated.name,
+	       texts[uinfo->value.enumerated.item]);
+	return 0;
+}
+EXPORT_SYMBOL_HDA(snd_hda_enum_helper_info);
+
 /*
  * Multi-channel / digital-out PCM helper functions
  */

sound/pci/hda/hda_local.h

@@ -600,6 +600,15 @@ int snd_hda_check_amp_list_power(struct hda_codec *codec,
 #define get_amp_offset(kc)	(((kc)->private_value >> 23) & 0x3f)
 #define get_amp_min_mute(kc)	(((kc)->private_value >> 29) & 0x1)
 
+/*
+ * enum control helper
+ */
+int snd_hda_enum_helper_info(struct snd_kcontrol *kcontrol,
+			     struct snd_ctl_elem_info *uinfo,
+			     int num_entries, const char * const *texts);
+#define snd_hda_enum_bool_helper_info(kcontrol, uinfo) \
+	snd_hda_enum_helper_info(kcontrol, uinfo, 0, NULL)
+
 /*
  * CEA Short Audio Descriptor data
  */

sound/pci/hda/patch_conexant.c

@@ -3435,28 +3435,13 @@ static int cx_automute_mode_info(struct snd_kcontrol *kcontrol,
 {
 	struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
 	struct conexant_spec *spec = codec->spec;
-	static const char * const texts2[] = {
-		"Disabled", "Enabled"
-	};
 	static const char * const texts3[] = {
 		"Disabled", "Speaker Only", "Line Out+Speaker"
 	};
-	const char * const *texts;
 
-	uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
+	if (spec->automute_hp_lo)
-	uinfo->count = 1;
+		return snd_hda_enum_helper_info(kcontrol, uinfo, 3, texts3);
-	if (spec->automute_hp_lo) {
+	return snd_hda_enum_bool_helper_info(kcontrol, uinfo);
-		uinfo->value.enumerated.items = 3;
-		texts = texts3;
-	} else {
-		uinfo->value.enumerated.items = 2;
-		texts = texts2;
-	}
-	if (uinfo->value.enumerated.item >= uinfo->value.enumerated.items)
-		uinfo->value.enumerated.item = uinfo->value.enumerated.items - 1;
-	strcpy(uinfo->value.enumerated.name,
-	       texts[uinfo->value.enumerated.item]);
-	return 0;
 }
 
 static int cx_automute_mode_get(struct snd_kcontrol *kcontrol,

sound/pci/hda/patch_realtek.c

@@ -815,28 +815,13 @@ static int alc_automute_mode_info(struct snd_kcontrol *kcontrol,
 {
 	struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
 	struct alc_spec *spec = codec->spec;
-	static const char * const texts2[] = {
-		"Disabled", "Enabled"
-	};
 	static const char * const texts3[] = {
 		"Disabled", "Speaker Only", "Line Out+Speaker"
 	};
-	const char * const *texts;
 
-	uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
+	if (spec->automute_speaker_possible && spec->automute_lo_possible)
-	uinfo->count = 1;
+		return snd_hda_enum_helper_info(kcontrol, uinfo, 3, texts3);
-	if (spec->automute_speaker_possible && spec->automute_lo_possible) {
+	return snd_hda_enum_bool_helper_info(kcontrol, uinfo);
-		uinfo->value.enumerated.items = 3;
-		texts = texts3;
-	} else {
-		uinfo->value.enumerated.items = 2;
-		texts = texts2;
-	}
-	if (uinfo->value.enumerated.item >= uinfo->value.enumerated.items)
-		uinfo->value.enumerated.item = uinfo->value.enumerated.items - 1;
-	strcpy(uinfo->value.enumerated.name,
-	       texts[uinfo->value.enumerated.item]);
-	return 0;
 }
 
 static int alc_automute_mode_get(struct snd_kcontrol *kcontrol,

sound/pci/hda/patch_via.c

@@ -739,18 +739,7 @@ static void set_pin_power_state(struct hda_codec *codec, hda_nid_t nid,
 static int via_pin_power_ctl_info(struct snd_kcontrol *kcontrol,
 				  struct snd_ctl_elem_info *uinfo)
 {
-	static const char * const texts[] = {
+	return snd_hda_enum_bool_helper_info(kcontrol, uinfo);
-		"Disabled", "Enabled"
-	};
-
-	uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
-	uinfo->count = 1;
-	uinfo->value.enumerated.items = 2;
-	if (uinfo->value.enumerated.item >= uinfo->value.enumerated.items)
-		uinfo->value.enumerated.item = uinfo->value.enumerated.items - 1;
-	strcpy(uinfo->value.enumerated.name,
-	       texts[uinfo->value.enumerated.item]);
-	return 0;
 }
 
 static int via_pin_power_ctl_get(struct snd_kcontrol *kcontrol,