/*
             LUFA Library
     Copyright (C) Dean Camera, 2009.
              
  dean [at] fourwalledcubicle [dot] com
      www.fourwalledcubicle.com
*/

/*
  Copyright 2009  Dean Camera (dean [at] fourwalledcubicle [dot] com)

  Permission to use, copy, modify, and distribute this software
  and its documentation for any purpose and without fee is hereby
  granted, provided that the above copyright notice appear in all
  copies and that both that the copyright notice and this
  permission notice and warranty disclaimer appear in supporting
  documentation, and that the name of the author not be used in
  advertising or publicity pertaining to distribution of the
  software without specific, written prior permission.

  The author disclaim all warranties with regard to this
  software, including all implied warranties of merchantability
  and fitness.  In no event shall the author be liable for any
  special, indirect or consequential damages or any damages
  whatsoever resulting from loss of use, data or profits, whether
  in an action of contract, negligence or other tortious action,
  arising out of or in connection with the use or performance of
  this software.
*/

/** \ingroup Group_USBDeviceClassDrivers
 *  @defgroup Group_USBClassRNDISDevice RNDIS Device Class Driver - LUFA/Drivers/Class/Device/RNDIS.h
 *
 *  \section Sec_Dependencies Module Source Dependencies
 *  The following files must be built with any user project that uses this module:
 *    - LUFA/Drivers/USB/Class/Device/RNDIS.c
 *
 *  \section Module Description
 *  Functions, macros, variables, enums and types related to the management of USB RNDIS Ethernet
 *  interfaces within a USB device.
 *
 *  @{
 */

#ifndef _RNDIS_CLASS_H_
#define _RNDIS_CLASS_H_

	/* Includes: */
		#include <string.h>
	
		#include "../../USB.h"
		#include "RNDISConstants.h"
		
	/* Enable C linkage for C++ Compilers: */
		#if defined(__cplusplus)
			extern "C" {
		#endif

	/* Macros: */
		/** Implemented RNDIS Version Major */
		#define REMOTE_NDIS_VERSION_MAJOR             0x01

		/** Implemented RNDIS Version Minor */
		#define REMOTE_NDIS_VERSION_MINOR             0x00
	
		/** RNDIS request to issue a host-to-device NDIS command */
		#define REQ_SendEncapsulatedCommand           0x00

		/** RNDIS request to issue a device-to-host NDIS response */
		#define REQ_GetEncapsulatedResponse           0x01
		
		/** Maximum size in bytes of a RNDIS control message which can be sent or received */
		#define RNDIS_MESSAGE_BUFFER_SIZE             128

		/** Maximum size in bytes of an Ethernet frame which can be sent or received */
		#define ETHERNET_FRAME_SIZE_MAX               1500
		
		/** Notification request value for a RNDIS Response Available notification */
		#define NOTIF_ResponseAvailable               1
		
	/* Enums: */
		/** Enum for the possible NDIS adapter states. */
		enum RNDIS_States_t
		{
			RNDIS_Uninitialized    = 0, /**< Adapter currently uninitialized */
			RNDIS_Initialized      = 1, /**< Adapter currently initialized but not ready for data transfers */
			RNDIS_Data_Initialized = 2, /**< Adapter currently initialized and ready for data transfers */
		};

		/** Enum for the NDIS hardware states */
		enum NDIS_Hardware_Status_t
		{
			NDIS_HardwareStatus_Ready, /**< Hardware Ready to accept commands from the host */
			NDIS_HardwareStatus_Initializing, /**< Hardware busy initializing */
			NDIS_HardwareStatus_Reset, /**< Hardware reset */
			NDIS_HardwareStatus_Closing, /**< Hardware currently closing */
			NDIS_HardwareStatus_NotReady /**< Hardware not ready to accept commands from the host */
		};
		
	/* Type Defines: */
		/** Type define for a physical MAC address of a device on a network */
		typedef struct
		{
			uint8_t       Octets[6]; /**< Individual bytes of a MAC address */
		} MAC_Address_t;

		/** Type define for a RNDIS message header, sent before RNDIS messages */
		typedef struct
		{
			uint32_t MessageType; /**< RNDIS message type, a REMOTE_NDIS_*_MSG constant */
			uint32_t MessageLength; /**< Total length of the RNDIS message, in bytes */
		} RNDIS_Message_Header_t;

		/** Type define for an Ethernet frame buffer. */
		typedef struct
		{
			uint8_t       FrameData[ETHERNET_FRAME_SIZE_MAX]; /**< Ethernet frame contents */
			uint16_t      FrameLength; /**< Length in bytes of the Ethernet frame stored in the buffer */
			bool          FrameInBuffer; /**< Indicates if a frame is currently stored in the buffer */
		} Ethernet_Frame_Info_t;

		/** Type define for a RNDIS packet message, used to encapsulate Ethernet packets sent to and from the adapter */
		typedef struct
		{
			uint32_t MessageType;
			uint32_t MessageLength;
			uint32_t DataOffset;
			uint32_t DataLength;
			uint32_t OOBDataOffset;
			uint32_t OOBDataLength;
			uint32_t NumOOBDataElements;
			uint32_t PerPacketInfoOffset;
			uint32_t PerPacketInfoLength;
			uint32_t VcHandle;
			uint32_t Reserved;
		} RNDIS_PACKET_MSG_t;

		/** Type define for a RNDIS Initialize command message */
		typedef struct
		{
			uint32_t MessageType;
			uint32_t MessageLength;
			uint32_t RequestId;
			
			uint32_t MajorVersion;
			uint32_t MinorVersion;
			uint32_t MaxTransferSize;
		} RNDIS_INITIALIZE_MSG_t;
		
		/** Type define for a RNDIS Initialize complete response message */
		typedef struct
		{
			uint32_t MessageType;
			uint32_t MessageLength;
			uint32_t RequestId;
			uint32_t Status;
			
			uint32_t MajorVersion;
			uint32_t MinorVersion;
			uint32_t DeviceFlags;
			uint32_t Medium;
			uint32_t MaxPacketsPerTransfer;
			uint32_t MaxTransferSize;
			uint32_t PacketAlignmentFactor;
			uint32_t AFListOffset;
			uint32_t AFListSize;
		} RNDIS_INITIALIZE_CMPLT_t;
		
		/** Type define for a RNDIS Keepalive command message */
		typedef struct
		{
			uint32_t MessageType;
			uint32_t MessageLength;
			uint32_t RequestId;
		} RNDIS_KEEPALIVE_MSG_t;

		/** Type define for a RNDIS Keepalive complete message */
		typedef struct
		{
			uint32_t MessageType;
			uint32_t MessageLength;
			uint32_t RequestId;
			uint32_t Status;
		} RNDIS_KEEPALIVE_CMPLT_t;

		/** Type define for a RNDIS Reset complete message */
		typedef struct
		{
			uint32_t MessageType;
			uint32_t MessageLength;
			uint32_t Status;

			uint32_t AddressingReset;
		} RNDIS_RESET_CMPLT_t;
		
		/** Type define for a RNDIS Set command message */
		typedef struct
		{
			uint32_t MessageType;
			uint32_t MessageLength;
			uint32_t RequestId;
			
			uint32_t Oid;
			uint32_t InformationBufferLength;
			uint32_t InformationBufferOffset;
			uint32_t DeviceVcHandle;
		} RNDIS_SET_MSG_t;

		/** Type define for a RNDIS Set complete response message */
		typedef struct
		{
			uint32_t MessageType;
			uint32_t MessageLength;
			uint32_t RequestId;
			uint32_t Status;
		} RNDIS_SET_CMPLT_t;
		
		/** Type define for a RNDIS Query command message */
		typedef struct
		{
			uint32_t MessageType;
			uint32_t MessageLength;
			uint32_t RequestId;
			
			uint32_t Oid;
			uint32_t InformationBufferLength;
			uint32_t InformationBufferOffset;
			uint32_t DeviceVcHandle;
		} RNDIS_QUERY_MSG_t;
		
		/** Type define for a RNDIS Query complete response message */
		typedef struct
		{
			uint32_t MessageType;
			uint32_t MessageLength;
			uint32_t RequestId;
			uint32_t Status;
			
			uint32_t InformationBufferLength;
			uint32_t InformationBufferOffset;
		} RNDIS_QUERY_CMPLT_t;

		/** Class state structure. An instance of this structure should be made for each RNDIS interface
		 *  within the user application, and passed to each of the RNDIS class driver functions as the
		 *  RNDISInterfaceInfo parameter. The contents of this structure should be set to their correct
		 *  values when used, or ommitted to force the library to use default values.
		 */
		typedef struct
		{
			uint8_t  ControlInterfaceNumber; /**< Interface number of the CDC control interface within the device */

			uint8_t  DataINEndpointNumber; /**< Endpoint number of the CDC interface's IN data endpoint */
			uint16_t DataINEndpointSize; /**< Size in bytes of the CDC interface's IN data endpoint */

			uint8_t  DataOUTEndpointNumber; /**< Endpoint number of the CDC interface's OUT data endpoint */
			uint16_t DataOUTEndpointSize;  /**< Size in bytes of the CDC interface's OUT data endpoint */

			uint8_t  NotificationEndpointNumber; /**< Endpoint number of the CDC interface's IN notification endpoint, if used */
			uint16_t NotificationEndpointSize;  /**< Size in bytes of the CDC interface's IN notification endpoint, if used */
			
			char*         AdapterVendorDescription; /**< String description of the adapter vendor */
			MAC_Address_t AdapterMACAddress; /**< MAC address of the adapter */

			uint8_t  RNDISMessageBuffer[RNDIS_MESSAGE_BUFFER_SIZE]; /**< Buffer to hold RNDIS messages to and from the host,
			                                                         *   managed by the class driver
			                                                         */
			bool     ResponseReady; /**< Internal flag indicating if a RNDIS message is waiting to be returned to the host */
			uint8_t  CurrRNDISState; /**< Current RNDIS state of the adapter, a value from the RNDIS_States_t enum */
			uint32_t CurrPacketFilter; /**< Current packet filter mode, used internally by the class driver */
			Ethernet_Frame_Info_t FrameIN; /**< Structure holding the last received Ethernet frame from the host, for user
			                                *   processing
			                                */
			Ethernet_Frame_Info_t FrameOUT; /**< Structure holding the next Ethernet frame to send to the host, populated by the
			                                 *   user application
			                                 */
		} USB_ClassInfo_RNDIS_t;
				
	/* Function Prototypes: */
		#if defined(INCLUDE_FROM_RNDIS_CLASS_C)
			static void USB_RNDIS_ProcessRNDISControlMessage(USB_ClassInfo_RNDIS_t* RNDISInterfaceInfo);
			static bool USB_RNDIS_ProcessNDISQuery(USB_ClassInfo_RNDIS_t* RNDISInterfaceInfo, 
			                                       uint32_t OId, void* QueryData, uint16_t QuerySize,
										           void* ResponseData, uint16_t* ResponseSize);
			static bool USB_RNDIS_ProcessNDISSet(USB_ClassInfo_RNDIS_t* RNDISInterfaceInfo, uint32_t OId,
			                                     void* SetData, uint16_t SetSize);	
		#endif

		/** Configures the endpoints of a given RNDIS interface, ready for use. This should be linked to the library
		 *  \ref EVENT_USB_ConfigurationChanged() event so that the endpoints are configured when the configuration
		 *  containing the given HID interface is selected.
		 *
		 *  \param RNDISInterfaceInfo  Pointer to a structure containing a RNDIS Class configuration and state.
		 *
		 *  \return Boolean true if the endpoints were sucessfully configured, false otherwise
		 */
		bool USB_RNDIS_ConfigureEndpoints(USB_ClassInfo_RNDIS_t* RNDISInterfaceInfo);

		/** Processes incomming control requests from the host, that are directed to the given RNDIS class interface. This should be
		 *  linked to the library \ref EVENT_USB_UnhandledControlPacket() event.
		 *
		 *  \param RNDISInterfaceInfo  Pointer to a structure containing a RNDIS Class configuration and state.
		 */		
		void USB_RNDIS_ProcessControlPacket(USB_ClassInfo_RNDIS_t* RNDISInterfaceInfo);
		
		/** General management task for a given HID class interface, required for the correct operation of the interface. This should
		 *  be called frequently in the main program loop, before the master USB management task \ref USB_USBTask().
		 *
		 *  \param RNDISInterfaceInfo  Pointer to a structure containing a RNDIS Class configuration and state.
		 */
		void USB_RNDIS_USBTask(USB_ClassInfo_RNDIS_t* RNDISInterfaceInfo);
		
	/* Disable C linkage for C++ Compilers: */
		#if defined(__cplusplus)
			}
		#endif
		
#endif

/** @} */