diff --git a/camera/device/3.2/default/CameraDevice.cpp b/camera/device/3.2/default/CameraDevice.cpp
index 637a1e6..295ee32 100644
--- a/camera/device/3.2/default/CameraDevice.cpp
+++ b/camera/device/3.2/default/CameraDevice.cpp
@@ -177,7 +177,7 @@
     if (callback == nullptr) {
         ALOGE("%s: cannot open camera %s. callback is null!",
                 __FUNCTION__, mCameraId.c_str());
-        _hidl_cb(Status::ILLEGAL_ARGUMENT, session);
+        _hidl_cb(Status::ILLEGAL_ARGUMENT, nullptr);
         return Void();
     }
 
@@ -186,7 +186,7 @@
         // this must be a disconnected camera
         ALOGE("%s: cannot open camera %s. camera is disconnected!",
                 __FUNCTION__, mCameraId.c_str());
-        _hidl_cb(Status::CAMERA_DISCONNECTED, session);
+        _hidl_cb(Status::CAMERA_DISCONNECTED, nullptr);
         return Void();
     } else {
         mLock.lock();
@@ -239,7 +239,7 @@
             return Void();
         }
 
-        session = new CameraDeviceSession(
+        session = createSession(
                 device, info.static_camera_characteristics, callback);
         if (session == nullptr) {
             ALOGE("%s: camera device session allocation failed", __FUNCTION__);
@@ -255,9 +255,19 @@
             return Void();
         }
         mSession = session;
+
+        IF_ALOGV() {
+            session->getInterface()->interfaceChain([](
+                ::android::hardware::hidl_vec<::android::hardware::hidl_string> interfaceChain) {
+                    ALOGV("Session interface chain:");
+                    for (auto iface : interfaceChain) {
+                        ALOGV("  %s", iface.c_str());
+                    }
+                });
+        }
         mLock.unlock();
     }
-    _hidl_cb(status, session);
+    _hidl_cb(status, session->getInterface());
     return Void();
 }
 
@@ -286,6 +296,13 @@
     session->dumpState(handle);
     return Void();
 }
+
+sp<CameraDeviceSession> CameraDevice::createSession(camera3_device_t* device,
+        const camera_metadata_t* deviceInfo,
+        const sp<ICameraDeviceCallback>& callback) {
+    return new CameraDeviceSession(device, deviceInfo, callback);
+}
+
 // End of methods from ::android::hardware::camera::device::V3_2::ICameraDevice.
 
 } // namespace implementation
diff --git a/camera/device/3.2/default/CameraDeviceSession.cpp b/camera/device/3.2/default/CameraDeviceSession.cpp
index fcd134f..d6a04bc 100644
--- a/camera/device/3.2/default/CameraDeviceSession.cpp
+++ b/camera/device/3.2/default/CameraDeviceSession.cpp
@@ -49,7 +49,6 @@
         mDerivePostRawSensKey(false),
         mNumPartialResults(1),
         mResultBatcher(callback) {
-
     mDeviceInfo = deviceInfo;
     camera_metadata_entry partialResultsCount =
             mDeviceInfo.find(ANDROID_REQUEST_PARTIAL_RESULT_COUNT);
@@ -328,7 +327,8 @@
     mStreamsToBatch = streamsToBatch;
 }
 
-void CameraDeviceSession::ResultBatcher::setResultMetadataQueue(std::shared_ptr<ResultMetadataQueue> q) {
+void CameraDeviceSession::ResultBatcher::setResultMetadataQueue(
+        std::shared_ptr<ResultMetadataQueue> q) {
     Mutex::Autolock _l(mLock);
     mResultMetadataQueue = q;
 }
@@ -387,7 +387,8 @@
     }
 }
 
-void CameraDeviceSession::ResultBatcher::sendBatchShutterCbsLocked(std::shared_ptr<InflightBatch> batch) {
+void CameraDeviceSession::ResultBatcher::sendBatchShutterCbsLocked(
+        std::shared_ptr<InflightBatch> batch) {
     if (batch->mShutterDelivered) {
         ALOGW("%s: batch shutter callback already sent!", __FUNCTION__);
         return;
@@ -441,7 +442,8 @@
     }
 }
 
-void CameraDeviceSession::ResultBatcher::sendBatchBuffersLocked(std::shared_ptr<InflightBatch> batch) {
+void CameraDeviceSession::ResultBatcher::sendBatchBuffersLocked(
+        std::shared_ptr<InflightBatch> batch) {
     sendBatchBuffersLocked(batch, mStreamsToBatch);
 }
 
@@ -736,7 +738,7 @@
 
 // Methods from ::android::hardware::camera::device::V3_2::ICameraDeviceSession follow.
 Return<void> CameraDeviceSession::constructDefaultRequestSettings(
-        RequestTemplate type, constructDefaultRequestSettings_cb _hidl_cb)  {
+        RequestTemplate type, ICameraDeviceSession::constructDefaultRequestSettings_cb _hidl_cb)  {
     Status status = initStatus();
     CameraMetadata outMetadata;
     const camera_metadata_t *rawRequest;
@@ -802,7 +804,8 @@
 }
 
 Return<void> CameraDeviceSession::configureStreams(
-        const StreamConfiguration& requestedConfiguration, configureStreams_cb _hidl_cb)  {
+        const StreamConfiguration& requestedConfiguration,
+        ICameraDeviceSession::configureStreams_cb _hidl_cb)  {
     Status status = initStatus();
     HalStreamConfiguration outStreams;
 
@@ -960,13 +963,13 @@
 }
 
 Return<void> CameraDeviceSession::getCaptureRequestMetadataQueue(
-    getCaptureRequestMetadataQueue_cb _hidl_cb) {
+    ICameraDeviceSession::getCaptureRequestMetadataQueue_cb _hidl_cb) {
     _hidl_cb(*mRequestMetadataQueue->getDesc());
     return Void();
 }
 
 Return<void> CameraDeviceSession::getCaptureResultMetadataQueue(
-    getCaptureResultMetadataQueue_cb _hidl_cb) {
+    ICameraDeviceSession::getCaptureResultMetadataQueue_cb _hidl_cb) {
     _hidl_cb(*mResultMetadataQueue->getDesc());
     return Void();
 }
@@ -974,7 +977,7 @@
 Return<void> CameraDeviceSession::processCaptureRequest(
         const hidl_vec<CaptureRequest>& requests,
         const hidl_vec<BufferCache>& cachesToRemove,
-        processCaptureRequest_cb _hidl_cb)  {
+        ICameraDeviceSession::processCaptureRequest_cb _hidl_cb)  {
     updateBufferCaches(cachesToRemove);
 
     uint32_t numRequestProcessed = 0;
diff --git a/camera/device/3.2/default/CameraDeviceSession.h b/camera/device/3.2/default/CameraDeviceSession.h
index 2fe189f..69e2e2c 100644
--- a/camera/device/3.2/default/CameraDeviceSession.h
+++ b/camera/device/3.2/default/CameraDeviceSession.h
@@ -55,6 +55,8 @@
 using ::android::sp;
 using ::android::Mutex;
 
+struct Camera3Stream;
+
 /**
  * Function pointer types with C calling convention to
  * use for HAL callback functions.
@@ -69,12 +71,12 @@
         const camera3_notify_msg_t *);
 }
 
-struct CameraDeviceSession : public ICameraDeviceSession, private camera3_callback_ops  {
+struct CameraDeviceSession : public virtual RefBase, protected camera3_callback_ops  {
 
     CameraDeviceSession(camera3_device_t*,
                         const camera_metadata_t* deviceInfo,
                         const sp<ICameraDeviceCallback>&);
-    ~CameraDeviceSession();
+    virtual ~CameraDeviceSession();
     // Call by CameraDevice to dump active device states
     void dumpState(const native_handle_t* fd);
     // Caller must use this method to check if CameraDeviceSession ctor failed
@@ -83,23 +85,35 @@
     void disconnect();
     bool isClosed();
 
-    // Methods from ::android::hardware::camera::device::V3_2::ICameraDeviceSession follow.
+    // Retrieve the HIDL interface, split into its own class to avoid inheritance issues when
+    // dealing with minor version revs and simultaneous implementation and interface inheritance
+    virtual sp<ICameraDeviceSession> getInterface() {
+        return new TrampolineSessionInterface_3_2(this);
+    }
+
+protected:
+
+    // Methods from ::android::hardware::camera::device::V3_2::ICameraDeviceSession follow
+
     Return<void> constructDefaultRequestSettings(
-            RequestTemplate type, constructDefaultRequestSettings_cb _hidl_cb) override;
+            RequestTemplate type,
+            ICameraDeviceSession::constructDefaultRequestSettings_cb _hidl_cb);
     Return<void> configureStreams(
-            const StreamConfiguration& requestedConfiguration, configureStreams_cb _hidl_cb) override;
+            const StreamConfiguration& requestedConfiguration,
+            ICameraDeviceSession::configureStreams_cb _hidl_cb);
     Return<void> getCaptureRequestMetadataQueue(
-        getCaptureRequestMetadataQueue_cb _hidl_cb) override;
+        ICameraDeviceSession::getCaptureRequestMetadataQueue_cb _hidl_cb);
     Return<void> getCaptureResultMetadataQueue(
-        getCaptureResultMetadataQueue_cb _hidl_cb) override;
+        ICameraDeviceSession::getCaptureResultMetadataQueue_cb _hidl_cb);
     Return<void> processCaptureRequest(
             const hidl_vec<CaptureRequest>& requests,
             const hidl_vec<BufferCache>& cachesToRemove,
-            processCaptureRequest_cb _hidl_cb) override;
-    Return<Status> flush() override;
-    Return<void> close() override;
+            ICameraDeviceSession::processCaptureRequest_cb _hidl_cb);
+    Return<Status> flush();
+    Return<void> close();
 
-private:
+protected:
+
     // protecting mClosed/mDisconnected/mInitFail
     mutable Mutex mStateLock;
     // device is closed either
@@ -302,6 +316,52 @@
      */
     static callbacks_process_capture_result_t sProcessCaptureResult;
     static callbacks_notify_t sNotify;
+
+private:
+
+    struct TrampolineSessionInterface_3_2 : public ICameraDeviceSession {
+        TrampolineSessionInterface_3_2(sp<CameraDeviceSession> parent) :
+                mParent(parent) {}
+
+        virtual Return<void> constructDefaultRequestSettings(
+                V3_2::RequestTemplate type,
+                V3_2::ICameraDeviceSession::constructDefaultRequestSettings_cb _hidl_cb) override {
+            return mParent->constructDefaultRequestSettings(type, _hidl_cb);
+        }
+
+        virtual Return<void> configureStreams(
+                const V3_2::StreamConfiguration& requestedConfiguration,
+                V3_2::ICameraDeviceSession::configureStreams_cb _hidl_cb) override {
+            return mParent->configureStreams(requestedConfiguration, _hidl_cb);
+        }
+
+        virtual Return<void> processCaptureRequest(const hidl_vec<V3_2::CaptureRequest>& requests,
+                const hidl_vec<V3_2::BufferCache>& cachesToRemove,
+                V3_2::ICameraDeviceSession::processCaptureRequest_cb _hidl_cb) override {
+            return mParent->processCaptureRequest(requests, cachesToRemove, _hidl_cb);
+        }
+
+        virtual Return<void> getCaptureRequestMetadataQueue(
+                V3_2::ICameraDeviceSession::getCaptureRequestMetadataQueue_cb _hidl_cb) override  {
+            return mParent->getCaptureRequestMetadataQueue(_hidl_cb);
+        }
+
+        virtual Return<void> getCaptureResultMetadataQueue(
+                V3_2::ICameraDeviceSession::getCaptureResultMetadataQueue_cb _hidl_cb) override  {
+            return mParent->getCaptureResultMetadataQueue(_hidl_cb);
+        }
+
+        virtual Return<Status> flush() override {
+            return mParent->flush();
+        }
+
+        virtual Return<void> close() override {
+            return mParent->close();
+        }
+
+    private:
+        sp<CameraDeviceSession> mParent;
+    };
 };
 
 }  // namespace implementation
diff --git a/camera/device/3.2/default/CameraDevice_3_2.h b/camera/device/3.2/default/CameraDevice_3_2.h
index 4e86067..9534707 100644
--- a/camera/device/3.2/default/CameraDevice_3_2.h
+++ b/camera/device/3.2/default/CameraDevice_3_2.h
@@ -80,7 +80,13 @@
     Return<void> dumpState(const ::android::hardware::hidl_handle& fd) override;
     /* End of Methods from ::android::hardware::camera::device::V3_2::ICameraDevice */
 
-private:
+protected:
+
+    // Overridden by child implementations for returning different versions of CameraDeviceSession
+    virtual sp<CameraDeviceSession> createSession(camera3_device_t*,
+            const camera_metadata_t* deviceInfo,
+            const sp<ICameraDeviceCallback>&);
+
     const sp<CameraModule> mModule;
     const std::string mCameraId;
     // const after ctor