tv.input: add HIDL definition for TV Input HAL

Note: Capturing and buffer producer paths have been removed since
there is no use case.

Test: make
Bug: 32096101
Change-Id: Ia00643ee07aadd15b00075f24711e2eaab1ae87d
diff --git a/tv/input/1.0/ITvInputCallback.hal b/tv/input/1.0/ITvInputCallback.hal
new file mode 100644
index 0000000..f2f07a0
--- /dev/null
+++ b/tv/input/1.0/ITvInputCallback.hal
@@ -0,0 +1,27 @@
+/*
+ * 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.input@1.0;
+
+interface ITvInputCallback {
+    /*
+     * Notifies the client that an event has occured. For possible event types,
+     * check TvInputEventType.
+     *
+     * @param event Event passed to the client.
+     */
+    notify(TvInputEvent event);
+};