ALSA: scarlett2: Fix Scarlett 4th Gen 4i4 low-voltage detection

The value currently being read to determine the low-voltage state is
actually the front panel state. Fix the code to use the correct offset
for the low-voltage state.
Signed-off-by: Geoffrey D. Bennett <g@b4.vu>
Fixes: d7cfa2fd ("ALSA: scarlett2: Add power status control")
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Message-ID: <d97b7d87f43b0e54f37e1552394be2f3ae182704.1710047969.git.g@b4.vu>

sound/usb/mixer_scarlett2.c

@@ -415,7 +415,7 @@ enum {
 	SCARLETT2_CONFIG_INPUT_SELECT_SWITCH,
 	SCARLETT2_CONFIG_INPUT_LINK_SWITCH,
 	SCARLETT2_CONFIG_POWER_EXT,
-	SCARLETT2_CONFIG_POWER_STATUS,
+	SCARLETT2_CONFIG_POWER_LOW,
 	SCARLETT2_CONFIG_PCM_INPUT_SWITCH,
 	SCARLETT2_CONFIG_DIRECT_MONITOR_GAIN,
 	SCARLETT2_CONFIG_COUNT
@@ -723,8 +723,8 @@ static const struct scarlett2_config_set scarlett2_config_set_gen4_4i4 = {
 		[SCARLETT2_CONFIG_POWER_EXT] = {
 			.offset = 0x168 },
 
-		[SCARLETT2_CONFIG_POWER_STATUS] = {
-			.offset = 0x66 }
+		[SCARLETT2_CONFIG_POWER_LOW] = {
+			.offset = 0x16d }
 	}
 };
 
@@ -6294,8 +6294,7 @@ static int scarlett2_update_power_status(struct usb_mixer_interface *mixer)
 {
 	struct scarlett2_data *private = mixer->private_data;
 	int err;
-	u8 power_ext;
-	u8 power_status;
+	u8 power_ext, power_low;
 
 	private->power_status_updated = 0;
 
@@ -6304,12 +6303,12 @@ static int scarlett2_update_power_status(struct usb_mixer_interface *mixer)
 	if (err < 0)
 		return err;
 
-	err = scarlett2_usb_get_config(mixer, SCARLETT2_CONFIG_POWER_STATUS,
-				       1, &power_status);
+	err = scarlett2_usb_get_config(mixer, SCARLETT2_CONFIG_POWER_LOW,
+				       1, &power_low);
 	if (err < 0)
 		return err;
 
-	if (power_status > 1)
+	if (power_low)
 		private->power_status = SCARLETT2_POWER_STATUS_FAIL;
 	else if (power_ext)
 		private->power_status = SCARLETT2_POWER_STATUS_EXT;