diff --git a/include/camera/CameraBase.h b/include/camera/CameraBase.h
index fed28ea..2735a86 100644
--- a/include/camera/CameraBase.h
+++ b/include/camera/CameraBase.h
@@ -71,6 +71,12 @@
                                        /*out*/
                                        struct CameraInfo* cameraInfo);
 
+    static status_t      addServiceListener(
+                                    const sp<ICameraServiceListener>& listener);
+
+    static status_t      removeServiceListener(
+                                    const sp<ICameraServiceListener>& listener);
+
     sp<TCamUser>         remote();
 
     // Status is set to 'UNKNOWN_ERROR' after successful (re)connection
diff --git a/include/camera/ICameraService.h b/include/camera/ICameraService.h
index ef2b685..aaf6eb3 100644
--- a/include/camera/ICameraService.h
+++ b/include/camera/ICameraService.h
@@ -27,6 +27,7 @@
 class ICameraClient;
 class IProCameraUser;
 class IProCameraCallbacks;
+class ICameraServiceListener;
 
 class ICameraService : public IInterface
 {
@@ -35,7 +36,9 @@
         GET_NUMBER_OF_CAMERAS = IBinder::FIRST_CALL_TRANSACTION,
         GET_CAMERA_INFO,
         CONNECT,
-        CONNECT_PRO
+        CONNECT_PRO,
+        ADD_LISTENER,
+        REMOVE_LISTENER,
     };
 
     enum {
@@ -45,9 +48,18 @@
 public:
     DECLARE_META_INTERFACE(CameraService);
 
-    virtual int32_t         getNumberOfCameras() = 0;
-    virtual status_t        getCameraInfo(int cameraId,
+    virtual int32_t  getNumberOfCameras() = 0;
+    virtual status_t getCameraInfo(int cameraId,
                                           struct CameraInfo* cameraInfo) = 0;
+
+    // Returns 'OK' if operation succeeded
+    // - Errors: ALREADY_EXISTS if the listener was already added
+    virtual status_t addListener(const sp<ICameraServiceListener>& listener)
+                                                                            = 0;
+    // Returns 'OK' if operation succeeded
+    // - Errors: BAD_VALUE if specified listener was not in the listener list
+    virtual status_t removeListener(const sp<ICameraServiceListener>& listener)
+                                                                            = 0;
     /**
      * clientPackageName and clientUid are used for permissions checking.  if
      * clientUid == USE_CALLING_UID, then the calling UID is used instead. Only
diff --git a/include/camera/ICameraServiceListener.h b/include/camera/ICameraServiceListener.h
new file mode 100644
index 0000000..207116a
--- /dev/null
+++ b/include/camera/ICameraServiceListener.h
@@ -0,0 +1,64 @@
+/*
+ * 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_HARDWARE_ICAMERASERVICE_LISTENER_H
+#define ANDROID_HARDWARE_ICAMERASERVICE_LISTENER_H
+
+#include <utils/RefBase.h>
+#include <binder/IInterface.h>
+#include <binder/Parcel.h>
+#include <hardware/camera_common.h>
+
+namespace android {
+
+class ICameraServiceListener : public IInterface
+{
+public:
+
+    enum Status {
+        // Device physically unplugged
+        STATUS_PRESENT          = CAMERA_DEVICE_STATUS_PRESENT,
+        // Device physically re-plugged
+        STATUS_NOT_PRESENT      = CAMERA_DEVICE_STATUS_NOT_PRESENT,
+
+        // Camera can be used exclusively
+        STATUS_AVAILABLE        = 0x80000000,
+        // Camera is in use by another app and cannot be used exclusively
+        STATUS_NOT_AVAILABLE,
+
+        // Use to initialize variables only
+        STATUS_UNKNOWN          = 0xFFFFFFFF,
+    };
+
+    DECLARE_META_INTERFACE(CameraServiceListener);
+
+    virtual void onStatusChanged(Status status, int32_t cameraId) = 0;
+};
+
+// ----------------------------------------------------------------------------
+
+class BnCameraServiceListener : public BnInterface<ICameraServiceListener>
+{
+public:
+    virtual status_t    onTransact( uint32_t code,
+                                    const Parcel& data,
+                                    Parcel* reply,
+                                    uint32_t flags = 0);
+};
+
+}; // namespace android
+
+#endif
diff --git a/include/camera/ProCamera.h b/include/camera/ProCamera.h
index b228145..e8dcdef 100644
--- a/include/camera/ProCamera.h
+++ b/include/camera/ProCamera.h
@@ -169,6 +169,9 @@
     /**
       * Delete a stream.
       * Lock free.
+      *
+      * NOTE: As a side effect this cancels ALL streaming requests.
+      *
       * Errors: BAD_VALUE if unknown stream ID.
       *         PERMISSION_DENIED if the stream wasn't yours
       */