More Bluetooth refactoring (#9905)

tmk_core/protocol/lufa/outputselect.c

@@ -12,8 +12,12 @@ You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#include "lufa.h"
 #include "outputselect.h"
+
+#if defined(PROTOCOL_LUFA)
+#    include "lufa.h"
+#endif
+
 #ifdef MODULE_ADAFRUIT_BLE
 #    include "adafruit_ble.h"
 #endif
@@ -35,12 +39,18 @@ void set_output(uint8_t output) {
  */
 __attribute__((weak)) void set_output_user(uint8_t output) {}
 
+static bool is_usb_configured(void) {
+#if defined(PROTOCOL_LUFA)
+    return USB_DeviceState == DEVICE_STATE_Configured;
+#endif
+}
+
 /** \brief Auto Detect Output
  *
  * FIXME: Needs doc
  */
 uint8_t auto_detect_output(void) {
-    if (USB_DeviceState == DEVICE_STATE_Configured) {
+    if (is_usb_configured()) {
         return OUTPUT_USB;
     }