diff --git a/automotive/evs/1.1/IEvsUltrasonicsArray.hal b/automotive/evs/1.1/IEvsUltrasonicsArray.hal
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+++ b/automotive/evs/1.1/IEvsUltrasonicsArray.hal
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+/*
+ * Copyright 2020 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.evs@1.1;
+
+import @1.0::EvsResult;
+import UltrasonicsArrayDesc;
+import UltrasonicsDataFrameDesc;
+import IEvsUltrasonicsArrayStream;
+
+/**
+ * HAL interface for ultrasonics sensor array.
+ */
+interface IEvsUltrasonicsArray {
+   /**
+    * Returns the ultrasonic sensor array information.
+    *
+    * @return  info  The description of this ultrasonic array. This must be the
+    *                same value as reported by IEvsEnumerator::getUltrasonicsArrayList().
+    */
+   getUltrasonicArrayInfo() generates (UltrasonicsArrayDesc info);
+
+   /**
+    * Specifies the depth of the buffer chain the ultrasonic sensors is
+    * asked to support.
+    *
+    * Up to this many data frames may be held concurrently by the client of IEvsUltrasonicsArray.
+    * If this many frames have been delivered to the receiver without being returned
+    * by doneWithFrame, the stream must skip frames until a buffer is returned for reuse.
+    * It is legal for this call to come at any time, even while streams are already running,
+    * in which case buffers should be added or removed from the chain as appropriate.
+    * If no call is made to this entry point, the IEvsUltrasonicsArray must support at least one
+    * data frame by default. More is acceptable.
+    *
+    * @param  bufferCount Number of buffers the client of
+    *                     IEvsUltrasonicsArray may hold concurrently.
+    * @return result      EvsResult::OK is returned if this call is successful.
+    *                     Will return EvsResult::INVALID_ARG on invalid bufferCount.
+    */
+   setMaxFramesInFlight(uint32_t bufferCount) generates (EvsResult result);
+
+   /**
+    * Requests to start the stream.
+    *
+    * @param  stream Implementation of IEvsUltrasonicsArrayStream.
+    * @return result EvsResult::OK is returned if this call is successful. Returns
+    *                EvsResult::STREAM_ALREADY_RUNNING if stream is already running.
+    */
+   startStream(IEvsUltrasonicsArrayStream stream) generates (EvsResult result);
+
+   /**
+    * Requests to stop the delivery of the ultrasonic array data frames.
+    *
+    * Because delivery is asynchronous, frames may continue to arrive for
+    * some time after this call returns. Each must be returned until the
+    * closure of the stream is signaled to the IEvsCameraStream.
+    * This function cannot fail and is ignored if the stream isn't running.
+    */
+   stopStream();
+
+   /**
+    * Notifies the UltrasonicsDataDesc is consumed that was received from
+    * IEvsUltrasonicsArrayStream.
+    *
+    * @param  dataFrameDesc Ultrasonics data descriptor.
+    */
+    doneWithDataFrame(UltrasonicsDataFrameDesc dataFrameDesc);
+};