/*	LPCUSB, an USB device driver for LPC microcontrollers		Copyright (C) 2006 Bertrik Sikken (bertrik@sikken.nl)	Redistribution and use in source and binary forms, with or without	modification, are permitted provided that the following conditions are met:	1. Redistributions of source code must retain the above copyright	   notice, this list of conditions and the following disclaimer.	2. Redistributions in binary form must reproduce the above copyright	   notice, this list of conditions and the following disclaimer in the	   documentation and/or other materials provided with the distribution.	3. The name of the author may not be used to endorse or promote products	   derived from this software without specific prior written permission.	THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 	INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.*//** @file	Control transfer handler.		This module handles control transfers and is normally installed on the	endpoint 0 callback.		Control transfers can be of the following type:	0 Standard;	1 Class;	2 Vendor;	3 Reserved.	A callback can be installed for each of these control transfers using	USBRegisterRequestHandler.	When an OUT request arrives, data is collected in the data store provided	with the USBRegisterRequestHandler call. When the transfer is done, the	callback is called.	When an IN request arrives, the callback is called immediately to either	put the control transfer data in the data store, or to get a pointer to	control transfer data. The data is then packetised and sent to the host.*/#include "type.h"#include "usbdebug.h"#include "usbstruct.h"#include "usbapi.h"#define	MAX_CONTROL_SIZE	128	/**< maximum total size of control transfer data */#define	MAX_REQ_HANDLERS	4	/**< standard, class, vendor, reserved */static TSetupPacket		Setup;	/**< setup packet */static U8				*pbData;	/**< pointer to data buffer */static int				iResidue;	/**< remaining bytes in buffer */static int				iLen;		/**< total length of control transfer *//** Array of installed request handler callbacks */static TFnHandleRequest *apfnReqHandlers[4] = {NULL, NULL, NULL, NULL};/** Array of installed request data pointers */static U8				*apbDataStore[4] = {NULL, NULL, NULL, NULL};/**	Local function to handle a request by calling one of the installed	request handlers.			In case of data going from host to device, the data is at *ppbData.	In case of data going from device to host, the handler can either	choose to write its data at *ppbData or update the data pointer.			@param [in]		pSetup		The setup packet	@param [in,out]	*piLen		Pointer to data length	@param [in,out]	ppbData		Data buffer.	@return TRUE if the request was handles successfully */static BOOL _HandleRequest(TSetupPacket *pSetup, int *piLen, U8 **ppbData){	TFnHandleRequest *pfnHandler;	int iType;		iType = REQTYPE_GET_TYPE(pSetup->bmRequestType);	pfnHandler = apfnReqHandlers[iType];	if (pfnHandler == NULL) {		DBG("No handler for reqtype %d\n", iType);		return FALSE;	}	return pfnHandler(pSetup, piLen, ppbData);}/**	Local function to stall the control endpoint		@param [in]	bEPStat	Endpoint status */static void StallControlPipe(U8 bEPStat){	U8	*pb;	int	i;	USBHwEPStall(0x80, TRUE);// dump setup packet	DBG("STALL on [");	pb = (U8 *)&Setup;	for (i = 0; i < 8; i++) {		DBG(" %02x", *pb++);	}	DBG("] stat=%x\n", bEPStat);}/**	Sends next chunk of data (possibly 0 bytes) to host */static void DataIn(void){	int iChunk;	iChunk = MIN(MAX_PACKET_SIZE0, iResidue);	USBHwEPWrite(0x80, pbData, iChunk);	pbData += iChunk;	iResidue -= iChunk;}/** *	Handles IN/OUT transfers on EP0 * *	@param [in]	bEP		Endpoint address *	@param [in]	bEPStat	Endpoint status */void USBHandleControlTransfer(U8 bEP, U8 bEPStat){	int iChunk, iType;	if (bEP == 0x00) {		// OUT transfer		if (bEPStat & EP_STATUS_SETUP) {			// setup packet, reset request message state machine			USBHwEPRead(0x00, (U8 *)&Setup, sizeof(Setup));			DBG("S%x", Setup.bRequest);			// defaults for data pointer and residue			iType = REQTYPE_GET_TYPE(Setup.bmRequestType);			pbData = apbDataStore[iType];			iResidue = Setup.wLength;			iLen = Setup.wLength;			if ((Setup.wLength == 0) ||				(REQTYPE_GET_DIR(Setup.bmRequestType) == REQTYPE_DIR_TO_HOST)) {				// ask installed handler to process request				if (!_HandleRequest(&Setup, &iLen, &pbData)) {					DBG("_HandleRequest1 failed\n");					StallControlPipe(bEPStat);					return;				}				// send smallest of requested and offered length				iResidue = MIN(iLen, Setup.wLength);				// send first part (possibly a zero-length status message)				DataIn();			}		}		else {					if (iResidue > 0) {				// store data				iChunk = USBHwEPRead(0x00, pbData, iResidue);				if (iChunk < 0) {					StallControlPipe(bEPStat);					return;				}				pbData += iChunk;				iResidue -= iChunk;				if (iResidue == 0) {					// received all, send data to handler					iType = REQTYPE_GET_TYPE(Setup.bmRequestType);					pbData = apbDataStore[iType];					if (!_HandleRequest(&Setup, &iLen, &pbData)) {						DBG("_HandleRequest2 failed\n");						StallControlPipe(bEPStat);						return;					}					// send status to host					DataIn();				}			}			else {				// absorb zero-length status message				iChunk = USBHwEPRead(0x00, NULL, 0);				DBG(iChunk > 0 ? "?" : "");			}		}	}	else if (bEP == 0x80) {		// IN transfer		// send more data if available (possibly a 0-length packet)		DataIn();	}	else {		ASSERT(FALSE);	}}/**	Registers a callback for handling requests			@param [in]	iType			Type of request, e.g. REQTYPE_TYPE_STANDARD	@param [in]	*pfnHandler		Callback function pointer	@param [in]	*pbDataStore	Data storage area for this type of request */void USBRegisterRequestHandler(int iType, TFnHandleRequest *pfnHandler, U8 *pbDataStore){	ASSERT(iType >= 0);	ASSERT(iType < 4);	apfnReqHandlers[iType] = pfnHandler;	apbDataStore[iType] = pbDataStore;}