diff --git a/include/ui/InputReader.h b/include/ui/InputReader.h
index f1622316f..71c6c5176 100644
--- a/include/ui/InputReader.h
+++ b/include/ui/InputReader.h
@@ -454,6 +454,8 @@ public:
     virtual void reset();
     virtual void process(const RawEvent* rawEvent);
 
+    virtual int32_t getScanCodeState(uint32_t sourceMask, int32_t scanCode);
+
 private:
     // Amount that trackball needs to move in order to generate a key event.
     static const int32_t TRACKBALL_MOVEMENT_THRESHOLD = 6;
diff --git a/libs/ui/InputReader.cpp b/libs/ui/InputReader.cpp
index 661870212..5f5a4ac4e 100644
--- a/libs/ui/InputReader.cpp
+++ b/libs/ui/InputReader.cpp
@@ -1080,6 +1080,14 @@ void TrackballInputMapper::applyPolicyAndDispatch(nsecs_t when, int32_t motionEv
             1, & pointerId, pointerCoords, mXPrecision, mYPrecision, downTime);
 }
 
+int32_t TrackballInputMapper::getScanCodeState(uint32_t sourceMask, int32_t scanCode) {
+    if (scanCode >= BTN_MOUSE && scanCode < BTN_JOYSTICK) {
+        return getEventHub()->getScanCodeState(getDeviceId(), scanCode);
+    } else {
+        return AKEY_STATE_UNKNOWN;
+    }
+}
+
 
 // --- TouchInputMapper ---