diff --git a/include/ui/Camera.h b/include/ui/Camera.h
index 9ceb8fd..5219772 100644
--- a/include/ui/Camera.h
+++ b/include/ui/Camera.h
@@ -78,6 +78,12 @@
     CAMERA_MSG_ALL_MSGS         = 0x1FF
 };
 
+// cmdType in sendCommand functions
+enum {
+    CAMERA_CMD_START_SMOOTH_ZOOM     = 1,
+    CAMERA_CMD_STOP_SMOOTH_ZOOM      = 2,
+};
+
 // camera fatal errors
 enum {
     CAMERA_ERROR_UKNOWN  = 1,
@@ -155,6 +161,9 @@
             // get preview/capture parameters - key/value pairs
             String8     getParameters() const;
 
+            // send command to camera driver
+            status_t    sendCommand(int32_t cmd, int32_t arg1, int32_t arg2);
+
             void        setListener(const sp<CameraListener>& listener);
             void        setPreviewCallbackFlags(int preview_callback_flag);
 
diff --git a/include/ui/CameraHardwareInterface.h b/include/ui/CameraHardwareInterface.h
index 5fbb7d8..af40f31 100644
--- a/include/ui/CameraHardwareInterface.h
+++ b/include/ui/CameraHardwareInterface.h
@@ -147,7 +147,7 @@
      * Returns true if recording is enabled.
      */
     virtual bool        recordingEnabled() = 0;
-    
+
     /**
      * Release a record frame previously returned by CAMERA_MSG_VIDEO_FRAME.
      */
@@ -186,11 +186,16 @@
     virtual CameraParameters  getParameters() const = 0;
 
     /**
+     * Send command to camera driver.
+     */
+    virtual status_t sendCommand(int32_t cmd, int32_t arg1, int32_t arg2) = 0;
+
+    /**
      * Release the hardware resources owned by this object.  Note that this is
      * *not* done in the destructor.
      */
     virtual void release() = 0;
-    
+
     /**
      * Dump state of the camera hardware
      */
diff --git a/include/ui/ICamera.h b/include/ui/ICamera.h
index 7595e36..5642691 100644
--- a/include/ui/ICamera.h
+++ b/include/ui/ICamera.h
@@ -87,6 +87,9 @@
 
     // get preview/capture parameters - key/value pairs
     virtual String8         getParameters() const = 0;
+
+    // send command to camera driver
+    virtual status_t        sendCommand(int32_t cmd, int32_t arg1, int32_t arg2) = 0;
 };
 
 // ----------------------------------------------------------------------------