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diff --git a/include/media_key.h b/include/media_key.h
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+/*
+ * Copyright (c) 2011 Samsung Electronics Co., Ltd All Rights Reserved
+ *
+ * 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 __TIZEN_SYSTEM_MEDIA_KEY_H__
+#define __TIZEN_SYSTEM_MEDIA_KEY_H__
+
+#include <tizen.h>
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+ /**
+ * @addtogroup CAPI_SYSTEM_MEDIA_KEY_MODULE
+ * @{
+ */
+
+/**
+ * @brief Enumeration of error code for media key
+ */
+
+typedef enum
+{
+	MEDIA_KEY_ERROR_NONE = TIZEN_ERROR_NONE, /**< Successful */
+	MEDIA_KEY_ERROR_INVALID_PARAMETER = TIZEN_ERROR_INVALID_PARAMETER, /**< Invalid parameter */
+} media_key_error_e;
+
+
+/**
+ * @brief Enumeration of media key
+ */
+typedef enum
+{
+	MEDIA_KEY_PLAY, /**< */
+	MEDIA_KEY_STOP, /**< */
+	MEDIA_KEY_PAUSE, /**< */
+	MEDIA_KEY_PREVIOUS, /**< */
+	MEDIA_KEY_NEXT, /**< */
+	MEDIA_KEY_FASTFORWARD, /**< */
+	MEDIA_KEY_REWIND, /**< */
+	MEDIA_KEY_UNKNOWN,
+} media_key_e;
+
+
+/**
+ * @brief Enumeration of media key event status
+ */
+typedef enum
+{
+	MEDIA_KEY_STATUS_PRESSED, /**<  */
+	MEDIA_KEY_STATUS_RELEASED, /**<  */
+	MEDIA_KEY_STATUS_UNKNOWN,
+} media_key_event_e;
+
+
+/**
+ * @brief   Called when the status of media key is changed
+ * @param[in] key the key which has status change
+ * @param[in] status the status of key
+ * @param[in] user_data The user data passed from the callback registration function
+ * @pre media_key_reserve() will invoke this callback function.
+ * @see media_key_reserve()
+ * @see media_key_release()
+ */
+typedef void (*media_key_event_cb)(media_key_e key, media_key_event_e status, void* user_data);
+
+
+/**
+ * @brief   Registers a change event callback for all media keys.
+ *
+ * @param[in] callback The callback function to invoke
+ * @param[in] user_data The user data to be passed to the callback function
+ *
+ * @return  0 on success, otherwise a negative error value.
+ * @retval  #MEDIA_KEY_ERROR_NONE Successful
+ * @retval  #MEDIA_KEY_ERROR_INVALID_PARAMETER Invalid parameter
+ * @post runtime_info_changed_cb() will be invoked.
+ *
+ * @see media_key_release()
+ * @see media_key_event_cb()
+*/
+int media_key_reserve(media_key_event_cb callback, void* user_data);
+
+
+/**
+ * @brief   Unregisters the callback function.
+ *
+ * @param[in] key The runtime information type
+ * @return  0 on success, otherwise a negative error value.
+ * @retval  #MEDIA_KEY_ERROR_NONE Successful
+ * @retval  #MEDIA_KEY_ERROR_INVALID_PARAMETER Invalid parameter
+ *
+ * @see media_key_set_event_cb()
+ */
+int media_key_release();
+
+
+/**
+ * @}
+ */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __TIZEN_SYSTEM_MEDIA_KEY_H__ */
+