diff --git a/automotive/audiocontrol/1.0/IAudioControlCallback.hal b/automotive/audiocontrol/1.0/IAudioControlCallback.hal
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+++ b/automotive/audiocontrol/1.0/IAudioControlCallback.hal
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+/*
+ * Copyright (C) 2017 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.automotive.audiocontrol@1.0;
+
+
+/**
+ * Implemented on client (framework) side to receive asynchronous updates from the car.
+ */
+interface IAudioControlCallback {
+
+    /**
+     * When the HAL makes this call, any apps currently playing must be asked to
+     * temporarily suspend playback (via an AudioManager::AUDIOFOCUS_LOSS_TRANSIENT event).
+     *
+     * This is only a suggestion. Apps may be slow to react or even ignore this message
+     * entirely. Enforcement, if necessary, must be done at the AudioHAL level as the
+     * samples are delivered. In most instances, this is the way a car should ask for
+     * quiet if it needs it for some important situation, such as warning alarms or chimes.
+     */
+    oneway suggestPausePlayers();
+
+
+    /**
+     * When the HAL makes this case, any apps currently playing must be asked to stop
+     * playing (via an AudioManager::AUDIOFOCUS_LOSS event). Once stopped, the apps must
+     * not resume their playback.
+     *
+     * It should be noted that not all apps or sound sources honor this request, but this
+     * at least gives an app the chance to do the right thing.
+     * Because it premanently stops media, this call is expected to be used only rarely.
+     * Perhaps in the event of an E-call, where resuming music might be undesirable assuming
+     * the driver is now dealing with whatever the emergency is?
+     */
+    oneway suggestStopPlayers();
+
+
+    /**
+     * Receives calls from the HAL when Android should resume normal operations. If the previous
+     * action was a requestPausePlayers, then things that were paused must be told they may
+     * resume.
+     */
+    oneway resumePlayers();
+};