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diff --git a/display/IBrailleService.aidl b/display/IBrailleService.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.IBrailleServiceCallback;
+
+/**
+ * Interface for clients to talk to the braille display service.
+ */
+interface IBrailleService {
+    /**
+     * Register a callback for the {@code callingApp} which will receive
+     * certain braille display related events.
+     */
+    boolean registerCallback(in IBrailleServiceCallback callback);
+
+    /**
+     * Unregister a previously registered callback for the {@code callingApp}.
+     */
+    oneway void unregisterCallback(in IBrailleServiceCallback callback);
+
+    /**
+     * Updates the main cells of the connected braille display
+     * with a given dot {@code pattern}.
+     *
+     * @return {@code true} on success and {@code false} otherwise.
+     */
+    void displayDots(in byte[] patterns);
+}