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/**
 * @brief Enumeration for the device state callback.
 * @since_tizen @if MOBILE 2.3 @elseif WEARABLE 2.3.1 @endif
 */
typedef enum
{
    DEVICE_CALLBACK_BATTERY_CAPACITY,    /**< Called when a battery charge percentage is changed */
    DEVICE_CALLBACK_BATTERY_LEVEL,       /**< Called when a battery level is changed */
    DEVICE_CALLBACK_BATTERY_CHARGING,    /**< Called when battery charging state is changed */
         DEVICE_CALLBACK_DISPLAY_STATE,       /**< Called when a display state is changed */
    DEVICE_CALLBACK_MAX
} device_callback_e;

/**
 * @brief Adds a callback to the observing device state.
 *
 * @since_tizen @if MOBILE 2.3 @elseif WEARABLE 2.3.1 @endif
 *
 * @param[in] type          The device type to monitor
 * @param[in] callback      The callback function to add
 * @param[in] user_data     The user data to be passed to the callback function
 *
 * @return @c 0 on success,
 *         otherwise a negative error value
 *
 * @retval #DEVICE_ERROR_NONE                   Successful
 * @retval #DEVICE_ERROR_INVALID_PARAMETER      Invalid parameter
 * @retval #DEVICE_ERROR_ALREADY_IN_PROGRESS    Operation already
 * @retval #DEVICE_ERROR_OPERATION_FAILED       Operation failed
 */
int device_add_callback(device_callback_e type, device_changed_cb callback, void *user_data);