diff --git a/camera/IProCameraCallbacks.cpp b/camera/IProCameraCallbacks.cpp
index 0fdb85a..bd3d420 100644
--- a/camera/IProCameraCallbacks.cpp
+++ b/camera/IProCameraCallbacks.cpp
@@ -67,11 +67,11 @@
                            IBinder::FLAG_ONEWAY);
     }
 
-    void onResultReceived(int32_t frameId, camera_metadata* result) {
+    void onResultReceived(int32_t requestId, camera_metadata* result) {
         ALOGV("onResultReceived");
         Parcel data, reply;
         data.writeInterfaceToken(IProCameraCallbacks::getInterfaceDescriptor());
-        data.writeInt32(frameId);
+        data.writeInt32(requestId);
         CameraMetadata::writeToParcel(data, result);
         remote()->transact(RESULT_RECEIVED, data, &reply, IBinder::FLAG_ONEWAY);
     }
@@ -107,10 +107,10 @@
         case RESULT_RECEIVED: {
             ALOGV("RESULT_RECEIVED");
             CHECK_INTERFACE(IProCameraCallbacks, data, reply);
-            int32_t frameId = data.readInt32();
+            int32_t requestId = data.readInt32();
             camera_metadata_t *result = NULL;
             CameraMetadata::readFromParcel(data, &result);
-            onResultReceived(frameId, result);
+            onResultReceived(requestId, result);
             return NO_ERROR;
             break;
         }
diff --git a/camera/ProCamera.cpp b/camera/ProCamera.cpp
index 577c760..ba5a48c 100644
--- a/camera/ProCamera.cpp
+++ b/camera/ProCamera.cpp
@@ -90,8 +90,8 @@
     }
 }
 
-void ProCamera::onResultReceived(int32_t frameId, camera_metadata* result) {
-    ALOGV("%s: frameId = %d, result = %p", __FUNCTION__, frameId, result);
+void ProCamera::onResultReceived(int32_t requestId, camera_metadata* result) {
+    ALOGV("%s: requestId = %d, result = %p", __FUNCTION__, requestId, result);
 
     sp<ProCameraListener> listener;
     {
@@ -112,7 +112,7 @@
     result = tmp.release();
 
     if (listener != NULL) {
-        listener->onResultReceived(frameId, result);
+        listener->onResultReceived(requestId, result);
     } else {
         free_camera_metadata(result);
     }
diff --git a/camera/camera2/ICameraDeviceCallbacks.cpp b/camera/camera2/ICameraDeviceCallbacks.cpp
index 3cec1f4..613358a 100644
--- a/camera/camera2/ICameraDeviceCallbacks.cpp
+++ b/camera/camera2/ICameraDeviceCallbacks.cpp
@@ -32,7 +32,9 @@
 namespace android {
 
 enum {
-    NOTIFY_CALLBACK = IBinder::FIRST_CALL_TRANSACTION,
+    CAMERA_ERROR = IBinder::FIRST_CALL_TRANSACTION,
+    CAMERA_IDLE,
+    CAPTURE_STARTED,
     RESULT_RECEIVED,
 };
 
@@ -44,19 +46,37 @@
     {
     }
 
-    // generic callback from camera service to app
-    void notifyCallback(int32_t msgType, int32_t ext1, int32_t ext2)
+    void onDeviceError(CameraErrorCode errorCode)
     {
-        ALOGV("notifyCallback");
+        ALOGV("onDeviceError");
         Parcel data, reply;
         data.writeInterfaceToken(ICameraDeviceCallbacks::getInterfaceDescriptor());
-        data.writeInt32(msgType);
-        data.writeInt32(ext1);
-        data.writeInt32(ext2);
-        remote()->transact(NOTIFY_CALLBACK, data, &reply, IBinder::FLAG_ONEWAY);
+        data.writeInt32(static_cast<int32_t>(errorCode));
+        remote()->transact(CAMERA_ERROR, data, &reply, IBinder::FLAG_ONEWAY);
         data.writeNoException();
     }
 
+    void onDeviceIdle()
+    {
+        ALOGV("onDeviceIdle");
+        Parcel data, reply;
+        data.writeInterfaceToken(ICameraDeviceCallbacks::getInterfaceDescriptor());
+        remote()->transact(CAMERA_IDLE, data, &reply, IBinder::FLAG_ONEWAY);
+        data.writeNoException();
+    }
+
+    void onCaptureStarted(int32_t requestId, int64_t timestamp)
+    {
+        ALOGV("onCaptureStarted");
+        Parcel data, reply;
+        data.writeInterfaceToken(ICameraDeviceCallbacks::getInterfaceDescriptor());
+        data.writeInt32(requestId);
+        data.writeInt64(timestamp);
+        remote()->transact(CAPTURE_STARTED, data, &reply, IBinder::FLAG_ONEWAY);
+        data.writeNoException();
+    }
+
+
     void onResultReceived(int32_t requestId, const CameraMetadata& result) {
         ALOGV("onResultReceived");
         Parcel data, reply;
@@ -79,18 +99,33 @@
 {
     ALOGV("onTransact - code = %d", code);
     switch(code) {
-        case NOTIFY_CALLBACK: {
-            ALOGV("NOTIFY_CALLBACK");
+        case CAMERA_ERROR: {
+            ALOGV("onDeviceError");
             CHECK_INTERFACE(ICameraDeviceCallbacks, data, reply);
-            int32_t msgType = data.readInt32();
-            int32_t ext1 = data.readInt32();
-            int32_t ext2 = data.readInt32();
-            notifyCallback(msgType, ext1, ext2);
+            CameraErrorCode errorCode =
+                    static_cast<CameraErrorCode>(data.readInt32());
+            onDeviceError(errorCode);
+            data.readExceptionCode();
+            return NO_ERROR;
+        } break;
+        case CAMERA_IDLE: {
+            ALOGV("onDeviceIdle");
+            CHECK_INTERFACE(ICameraDeviceCallbacks, data, reply);
+            onDeviceIdle();
+            data.readExceptionCode();
+            return NO_ERROR;
+        } break;
+        case CAPTURE_STARTED: {
+            ALOGV("onCaptureStarted");
+            CHECK_INTERFACE(ICameraDeviceCallbacks, data, reply);
+            int32_t requestId = data.readInt32();
+            int64_t timestamp = data.readInt64();
+            onCaptureStarted(requestId, timestamp);
             data.readExceptionCode();
             return NO_ERROR;
         } break;
         case RESULT_RECEIVED: {
-            ALOGV("RESULT_RECEIVED");
+            ALOGV("onResultReceived");
             CHECK_INTERFACE(ICameraDeviceCallbacks, data, reply);
             int32_t requestId = data.readInt32();
             CameraMetadata result;
@@ -102,8 +137,7 @@
             onResultReceived(requestId, result);
             data.readExceptionCode();
             return NO_ERROR;
-            break;
-        }
+        } break;
         default:
             return BBinder::onTransact(code, data, reply, flags);
     }
diff --git a/camera/tests/ProCameraTests.cpp b/camera/tests/ProCameraTests.cpp
index e9aa99d..1f5867a 100644
--- a/camera/tests/ProCameraTests.cpp
+++ b/camera/tests/ProCameraTests.cpp
@@ -284,9 +284,9 @@
         }
     }
 
-    virtual void onResultReceived(int32_t frameId,
+    virtual void onResultReceived(int32_t requestId,
                                   camera_metadata* request) {
-        dout << "Result received frameId = " << frameId
+        dout << "Result received requestId = " << requestId
              << ", requestPtr = " << (void*)request << std::endl;
         QueueEvent(RESULT_RECEIVED);
         free_camera_metadata(request);
@@ -1276,4 +1276,3 @@
 }
 }
 }
-