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diff --git a/services/camera/libcameraservice/common/Camera2ClientBase.h b/services/camera/libcameraservice/common/Camera2ClientBase.h
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+++ b/services/camera/libcameraservice/common/Camera2ClientBase.h
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+/*
+ * Copyright (C) 2013 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.
+ */
+
+#ifndef ANDROID_SERVERS_CAMERA_CAMERA2CLIENT_BASE_H
+#define ANDROID_SERVERS_CAMERA_CAMERA2CLIENT_BASE_H
+
+#include "common/CameraDeviceBase.h"
+
+namespace android {
+
+class IMemory;
+
+class CameraService;
+
+template <typename TClientBase>
+class Camera2ClientBase :
+        public TClientBase,
+        public CameraDeviceBase::NotificationListener
+{
+public:
+    typedef typename TClientBase::TCamCallbacks TCamCallbacks;
+
+    /**
+     * Base binder interface (see ICamera/IProCameraUser for details)
+     */
+    virtual status_t      connect(const sp<TCamCallbacks>& callbacks);
+    virtual void          disconnect();
+
+    /**
+     * Interface used by CameraService
+     */
+
+    // TODO: too many params, move into a ClientArgs<T>
+    Camera2ClientBase(const sp<CameraService>& cameraService,
+                      const sp<TCamCallbacks>& remoteCallback,
+                      const String16& clientPackageName,
+                      int cameraId,
+                      int cameraFacing,
+                      int clientPid,
+                      uid_t clientUid,
+                      int servicePid);
+    virtual ~Camera2ClientBase();
+
+    virtual status_t      initialize(camera_module_t *module);
+    virtual status_t      dump(int fd, const Vector<String16>& args);
+
+    /**
+     * CameraDeviceBase::NotificationListener implementation
+     */
+
+    virtual void          notifyError(int errorCode, int arg1, int arg2);
+    virtual void          notifyIdle();
+    virtual void          notifyShutter(int requestId, nsecs_t timestamp);
+    virtual void          notifyAutoFocus(uint8_t newState, int triggerId);
+    virtual void          notifyAutoExposure(uint8_t newState, int triggerId);
+    virtual void          notifyAutoWhitebalance(uint8_t newState,
+                                                 int triggerId);
+
+
+    int                   getCameraId() const;
+    const sp<CameraDeviceBase>&
+                          getCameraDevice();
+    const sp<CameraService>&
+                          getCameraService();
+
+    /**
+     * Interface used by independent components of CameraClient2Base.
+     */
+
+    // Simple class to ensure that access to TCamCallbacks is serialized
+    // by requiring mRemoteCallbackLock to be locked before access to
+    // mRemoteCallback is possible.
+    class SharedCameraCallbacks {
+      public:
+        class Lock {
+          public:
+            Lock(SharedCameraCallbacks &client);
+            ~Lock();
+            sp<TCamCallbacks> &mRemoteCallback;
+          private:
+            SharedCameraCallbacks &mSharedClient;
+        };
+        SharedCameraCallbacks(const sp<TCamCallbacks>& client);
+        SharedCameraCallbacks& operator=(const sp<TCamCallbacks>& client);
+        void clear();
+      private:
+        sp<TCamCallbacks> mRemoteCallback;
+        mutable Mutex mRemoteCallbackLock;
+    } mSharedCameraCallbacks;
+
+protected:
+
+    virtual sp<IBinder> asBinderWrapper() {
+        return IInterface::asBinder();
+    }
+
+    virtual status_t      dumpDevice(int fd, const Vector<String16>& args);
+
+    /** Binder client interface-related private members */
+
+    // Mutex that must be locked by methods implementing the binder client
+    // interface. Ensures serialization between incoming client calls.
+    // All methods in this class hierarchy that append 'L' to the name assume
+    // that mBinderSerializationLock is locked when they're called
+    mutable Mutex         mBinderSerializationLock;
+
+    /** CameraDeviceBase instance wrapping HAL2+ entry */
+
+    sp<CameraDeviceBase>  mDevice;
+
+    /** Utility members */
+
+    // Verify that caller is the owner of the camera
+    status_t              checkPid(const char *checkLocation) const;
+
+    virtual void          detachDevice();
+};
+
+}; // namespace android
+
+#endif