hdmi_cec: Add HIDL definition and default implementation

Bug: 32073236
Test: make
Change-Id: I6f98bf0c523e31e2863a3c0379d7fda1ef51b0d6
diff --git a/tv/cec/1.0/IHdmiCecCallback.hal b/tv/cec/1.0/IHdmiCecCallback.hal
new file mode 100644
index 0000000..4a9d28f
--- /dev/null
+++ b/tv/cec/1.0/IHdmiCecCallback.hal
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * 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 android.hardware.tv.cec@1.0;
+
+interface IHdmiCecCallback {
+    /*
+     * The callback function that must be called by HAL implementation to notify
+     * the system of new CEC message arrival.
+     */
+    oneway onCecMessage(CecMessage message);
+
+    /*
+     * The callback function that must be called by HAL implementation to notify
+     * the system of new hotplug event.
+     */
+    oneway onHotplugEvent(HotplugEvent event);
+};