ALSA: usb-audio: scarlett2: Split up sw_hw_enum_ctl_put()

Split part of scarlett2_sw_hw_enum_ctl_put() out into
scarlett2_sw_hw_change() so that the code which actually makes the
change is available in its own function. This will be used by the
speaker switching support which needs to set the SW/HW switch to HW
when speaker switching is enabled.
Signed-off-by: Geoffrey D. Bennett <g@b4.vu>
Link: https://lore.kernel.org/r/f2cf91841ba067b490e7709bc4b14f4532b4ddd5.1624379707.git.g@b4.vuSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/usb/mixer_scarlett_gen2.c

@@ -1904,23 +1904,12 @@ static void scarlett2_vol_ctl_set_writable(struct usb_mixer_interface *mixer,
 		       &private->mute_ctls[index]->id);
 }
 
-static int scarlett2_sw_hw_enum_ctl_put(struct snd_kcontrol *kctl,
-					struct snd_ctl_elem_value *ucontrol)
+static int scarlett2_sw_hw_change(struct usb_mixer_interface *mixer,
+				  int ctl_index, int val)
 {
-	struct usb_mixer_elem_info *elem = kctl->private_data;
-	struct usb_mixer_interface *mixer = elem->head.mixer;
 	struct scarlett2_data *private = mixer->private_data;
-	int ctl_index = elem->control;
 	int index = line_out_remap(private, ctl_index);
-	int oval, val, err = 0;
-
-	mutex_lock(&private->data_mutex);
-
-	oval = private->vol_sw_hw_switch[index];
-	val = !!ucontrol->value.enumerated.item[0];
-
-	if (oval == val)
-		goto unlock;
+	int err;
 
 	private->vol_sw_hw_switch[index] = val;
 
@@ -1938,18 +1927,39 @@ static int scarlett2_sw_hw_enum_ctl_put(struct snd_kcontrol *kctl,
 		mixer, SCARLETT2_CONFIG_LINE_OUT_VOLUME,
 		index, private->master_vol - SCARLETT2_VOLUME_BIAS);
 	if (err < 0)
-		goto unlock;
+		return err;
 
 	/* Set SW mute to current HW mute */
 	err = scarlett2_usb_set_config(
 		mixer, SCARLETT2_CONFIG_MUTE_SWITCH,
 		index, private->dim_mute[SCARLETT2_BUTTON_MUTE]);
 	if (err < 0)
-		goto unlock;
+		return err;
 
 	/* Send SW/HW switch change to the device */
-	err = scarlett2_usb_set_config(mixer, SCARLETT2_CONFIG_SW_HW_SWITCH,
-				       index, val);
+	return scarlett2_usb_set_config(mixer, SCARLETT2_CONFIG_SW_HW_SWITCH,
+					index, val);
+}
+
+static int scarlett2_sw_hw_enum_ctl_put(struct snd_kcontrol *kctl,
+					struct snd_ctl_elem_value *ucontrol)
+{
+	struct usb_mixer_elem_info *elem = kctl->private_data;
+	struct usb_mixer_interface *mixer = elem->head.mixer;
+	struct scarlett2_data *private = mixer->private_data;
+	int ctl_index = elem->control;
+	int index = line_out_remap(private, ctl_index);
+	int oval, val, err = 0;
+
+	mutex_lock(&private->data_mutex);
+
+	oval = private->vol_sw_hw_switch[index];
+	val = !!ucontrol->value.enumerated.item[0];
+
+	if (oval == val)
+		goto unlock;
+
+	err = scarlett2_sw_hw_change(mixer, ctl_index, val);
 	if (err == 0)
 		err = 1;