Add HAVE_LINEOUT_DETECTION and associated logic

This allows targets to automatically switch audio settings when the
line out is plugged/unplugged.

Only hooked up on the xDuoo X3, but there are other potential users.

Change-Id: Ic46a329bc955cca2e2ad0335ca16295eab24ad59

1 files changed, 4 insertions, 1 deletions

diff --git a/firmware/export/button.h b/firmware/export/button.h
index 7109c00f97..d9732ebe8b 100644
--- a/firmware/export/button.h
+++ b/firmware/export/button.h
@@ -44,7 +44,7 @@ int button_read_device(void);
 #ifdef HAS_BUTTON_HOLD
 bool button_hold(void);
 #endif
-#ifdef HAS_REMOTE_BUTTON_HOLD 
+#ifdef HAS_REMOTE_BUTTON_HOLD
 bool remote_button_hold(void);
 #endif
 
@@ -72,6 +72,9 @@ void set_remote_backlight_filter_keypress(bool value);
 #ifdef HAVE_HEADPHONE_DETECTION
 bool headphones_inserted(void);
 #endif
+#ifdef HAVE_LINEOUT_DETECTION
+bool lineout_inserted(void);
+#endif
 #ifdef HAVE_WHEEL_POSITION
 int wheel_status(void);
 void wheel_send_events(bool send);