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diff --git a/display/IBrailleServiceCallback.aidl b/display/IBrailleServiceCallback.aidl
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+/*
+ * Copyright (C) 2012 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+package com.googlecode.eyesfree.braille.display;
+
+import com.googlecode.eyesfree.braille.display.BrailleDisplayProperties;
+import com.googlecode.eyesfree.braille.display.BrailleInputEvent;
+
+/**
+ * Callback interface that a braille display client can expose to
+ * get information about various braille display events.
+ */
+interface IBrailleServiceCallback {
+    void onDisplayConnected(in BrailleDisplayProperties displayProperties);
+    void onDisplayDisconnected();
+    void onInput(in BrailleInputEvent inputEvent);
+}