diff --git a/camera/device/3.7/ICameraInjectionSession.hal b/camera/device/3.7/ICameraInjectionSession.hal
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+++ b/camera/device/3.7/ICameraInjectionSession.hal
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+/*
+ * Copyright (C) 2021 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.camera.device@3.7;
+
+import android.hardware.camera.common@1.0::Status;
+import @3.2::BufferCache;
+import @3.2::CameraMetadata;
+import @3.5::StreamConfiguration;
+import @3.6::HalStreamConfiguration;
+import @3.7::ICameraDeviceSession;
+
+/**
+ * Injection Camera device active session interface.
+ *
+ * When an external camera is injected to replace the internal camera session, the
+ * injection session will be established in camera framework, and then
+ * configureInjectionStreams() will be called to ask the external camera to
+ * configure itself to match the stream configuration of the internal camera.
+ *
+ * Camera framework is responsible to close the injection session once the client
+ * switch back to internal camera streaming.
+ *
+ * If the external camera cannot support the configuration ILLEGAL_ARGUMENT will
+ * be returned.
+ */
+interface ICameraInjectionSession extends @3.7::ICameraDeviceSession {
+    /**
+     * configureInjectionStreams:
+     *
+     * Identical to @3.7::ICameraDeviceSession.configureStreams_3_7, except that:
+     *
+     * @param requestedConfiguration
+     *     The current stream configuration of the internal camera session and
+     *     the injection camera must follow the configuration without overriding
+     *     any part of it.
+     * @param characteristics
+     *     The characteristics of internal camera contains a list of keys so that
+     *     the stream continuity can be maintained after the external camera is
+     *     injected.
+     *
+     * @return status Status code for the operation, one of:
+     *     OK:
+     *         On successful stream configuration.
+     *     INTERNAL_ERROR:
+     *         If there has been a fatal error and the device is no longer
+     *         operational. Only close() can be called successfully by the
+     *         framework after this error is returned.
+     *     ILLEGAL_ARGUMENT:
+     *         If the requested stream configuration is invalid. Some examples
+     *         of invalid stream configurations include:
+     *           - Not including any OUTPUT streams
+     *           - Including streams with unsupported formats, or an unsupported
+     *             size for that format.
+     *           - Including too many output streams of a certain format.
+     *           - Unsupported rotation configuration
+     *           - Stream sizes/formats don't satisfy the
+     *             StreamConfigurationMode requirements
+     *             for non-NORMAL mode, or the requested operation_mode is not
+     *             supported by the HAL.
+     *           - Unsupported usage flag
+     *         The camera service cannot filter out all possible illegal stream
+     *         configurations, since some devices may support more simultaneous
+     *         streams or larger stream resolutions than the minimum required
+     *         for a given camera device hardware level. The HAL must return an
+     *         ILLEGAL_ARGUMENT for any unsupported stream set, and then be
+     *         ready to accept a future valid stream configuration in a later
+     *         configureInjectionStreams call.
+     */
+    configureInjectionStreams(StreamConfiguration requestedConfiguration,
+            CameraMetadata characteristics) generates (Status status);
+};