MassStorage.c 7.51 KB
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/*
             LUFA Library
     Copyright (C) Dean Camera, 2010.
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  dean [at] fourwalledcubicle [dot] com
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           www.lufa-lib.org
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*/

/*
  Copyright 2010  Dean Camera (dean [at] fourwalledcubicle [dot] com)

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  Permission to use, copy, modify, distribute, and sell this
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  software and its documentation for any purpose is hereby granted
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  without fee, provided that the above copyright notice appear in
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  all copies and that both that the copyright notice and this
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  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
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  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.
*/

#define  __INCLUDE_FROM_USB_DRIVER
#include "../../HighLevel/USBMode.h"
#if defined(USB_CAN_BE_DEVICE)

#define  __INCLUDE_FROM_MS_DRIVER
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#define  __INCLUDE_FROM_MASSSTORAGE_DEVICE_C
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#include "MassStorage.h"

static volatile bool* CallbackIsResetSource;

void MS_Device_ProcessControlRequest(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
{
	if (!(Endpoint_IsSETUPReceived()))
	  return;
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	if (USB_ControlRequest.wIndex != MSInterfaceInfo->Config.InterfaceNumber)
	  return;

	switch (USB_ControlRequest.bRequest)
	{
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		case MS_REQ_MassStorageReset:
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			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
			{
				Endpoint_ClearSETUP();
				Endpoint_ClearStatusStage();
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				MSInterfaceInfo->State.IsMassStoreReset = true;
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			}

			break;
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		case MS_REQ_GetMaxLUN:
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			if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
			{
				Endpoint_ClearSETUP();
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				Endpoint_Write_Byte(MSInterfaceInfo->Config.TotalLUNs - 1);
				Endpoint_ClearIN();
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				Endpoint_ClearStatusStage();
			}
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			break;
	}
}

bool MS_Device_ConfigureEndpoints(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
{
	memset(&MSInterfaceInfo->State, 0x00, sizeof(MSInterfaceInfo->State));

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	for (uint8_t EndpointNum = 1; EndpointNum < ENDPOINT_TOTAL_ENDPOINTS; EndpointNum++)
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	{
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		uint16_t Size;
		uint8_t  Type;
		uint8_t  Direction;
		bool     DoubleBanked;

		if (EndpointNum == MSInterfaceInfo->Config.DataINEndpointNumber)
		{
			Size         = MSInterfaceInfo->Config.DataINEndpointSize;
			Direction    = ENDPOINT_DIR_IN;
			Type         = EP_TYPE_BULK;
			DoubleBanked = MSInterfaceInfo->Config.DataINEndpointDoubleBank;
		}
		else if (EndpointNum == MSInterfaceInfo->Config.DataOUTEndpointNumber)
		{
			Size         = MSInterfaceInfo->Config.DataOUTEndpointSize;
			Direction    = ENDPOINT_DIR_OUT;
			Type         = EP_TYPE_BULK;
			DoubleBanked = MSInterfaceInfo->Config.DataOUTEndpointDoubleBank;
		}
		else
		{
			continue;
		}
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		if (!(Endpoint_ConfigureEndpoint(EndpointNum, Type, Direction, Size,
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		                                 DoubleBanked ? ENDPOINT_BANK_DOUBLE : ENDPOINT_BANK_SINGLE)))
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		{
			return false;
		}
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	}
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	return true;
}

void MS_Device_USBTask(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
{
	if (USB_DeviceState != DEVICE_STATE_Configured)
	  return;

	Endpoint_SelectEndpoint(MSInterfaceInfo->Config.DataOUTEndpointNumber);
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	if (Endpoint_IsReadWriteAllowed())
	{
		if (MS_Device_ReadInCommandBlock(MSInterfaceInfo))
		{
			if (MSInterfaceInfo->State.CommandBlock.Flags & MS_COMMAND_DIR_DATA_IN)
			  Endpoint_SelectEndpoint(MSInterfaceInfo->Config.DataINEndpointNumber);
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			MSInterfaceInfo->State.CommandStatus.Status = CALLBACK_MS_Device_SCSICommandReceived(MSInterfaceInfo) ?
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			                                               MS_SCSI_COMMAND_Pass : MS_SCSI_COMMAND_Fail;
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			MSInterfaceInfo->State.CommandStatus.Signature           = MS_CSW_SIGNATURE;
			MSInterfaceInfo->State.CommandStatus.Tag                 = MSInterfaceInfo->State.CommandBlock.Tag;
			MSInterfaceInfo->State.CommandStatus.DataTransferResidue = MSInterfaceInfo->State.CommandBlock.DataTransferLength;

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			if ((MSInterfaceInfo->State.CommandStatus.Status == MS_SCSI_COMMAND_Fail) &&
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			    (MSInterfaceInfo->State.CommandStatus.DataTransferResidue))
			{
				Endpoint_StallTransaction();
			}
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			MS_Device_ReturnCommandStatus(MSInterfaceInfo);
		}
	}
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	if (MSInterfaceInfo->State.IsMassStoreReset)
	{
		Endpoint_ResetFIFO(MSInterfaceInfo->Config.DataOUTEndpointNumber);
		Endpoint_ResetFIFO(MSInterfaceInfo->Config.DataINEndpointNumber);
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		Endpoint_SelectEndpoint(MSInterfaceInfo->Config.DataOUTEndpointNumber);
		Endpoint_ClearStall();
		Endpoint_ResetDataToggle();
		Endpoint_SelectEndpoint(MSInterfaceInfo->Config.DataINEndpointNumber);
		Endpoint_ClearStall();
		Endpoint_ResetDataToggle();

		MSInterfaceInfo->State.IsMassStoreReset = false;
	}
}

static bool MS_Device_ReadInCommandBlock(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
{
	Endpoint_SelectEndpoint(MSInterfaceInfo->Config.DataOUTEndpointNumber);

	CallbackIsResetSource = &MSInterfaceInfo->State.IsMassStoreReset;
	if (Endpoint_Read_Stream_LE(&MSInterfaceInfo->State.CommandBlock,
	                            (sizeof(MS_CommandBlockWrapper_t) - 16),
	                            StreamCallback_MS_Device_AbortOnMassStoreReset))
	{
		return false;
	}
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	if ((MSInterfaceInfo->State.CommandBlock.Signature         != MS_CBW_SIGNATURE)                  ||
	    (MSInterfaceInfo->State.CommandBlock.LUN               >= MSInterfaceInfo->Config.TotalLUNs) ||
		(MSInterfaceInfo->State.CommandBlock.Flags              & 0x1F)                              ||
		(MSInterfaceInfo->State.CommandBlock.SCSICommandLength == 0)                                 ||
		(MSInterfaceInfo->State.CommandBlock.SCSICommandLength >  16))
	{
		Endpoint_StallTransaction();
		Endpoint_SelectEndpoint(MSInterfaceInfo->Config.DataINEndpointNumber);
		Endpoint_StallTransaction();
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		return false;
	}

	CallbackIsResetSource = &MSInterfaceInfo->State.IsMassStoreReset;
	if (Endpoint_Read_Stream_LE(&MSInterfaceInfo->State.CommandBlock.SCSICommandData,
	                            MSInterfaceInfo->State.CommandBlock.SCSICommandLength,
	                            StreamCallback_MS_Device_AbortOnMassStoreReset))
	{
		return false;
	}

	Endpoint_ClearOUT();
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	return true;
}

static void MS_Device_ReturnCommandStatus(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
{
	Endpoint_SelectEndpoint(MSInterfaceInfo->Config.DataOUTEndpointNumber);

	while (Endpoint_IsStalled())
	{
		#if !defined(INTERRUPT_CONTROL_ENDPOINT)
		USB_USBTask();
		#endif

		if (MSInterfaceInfo->State.IsMassStoreReset)
		  return;
	}

	Endpoint_SelectEndpoint(MSInterfaceInfo->Config.DataINEndpointNumber);

	while (Endpoint_IsStalled())
	{
		#if !defined(INTERRUPT_CONTROL_ENDPOINT)
		USB_USBTask();
		#endif
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		if (MSInterfaceInfo->State.IsMassStoreReset)
		  return;
	}
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	CallbackIsResetSource = &MSInterfaceInfo->State.IsMassStoreReset;
	if (Endpoint_Write_Stream_LE(&MSInterfaceInfo->State.CommandStatus, sizeof(MS_CommandStatusWrapper_t),
	                             StreamCallback_MS_Device_AbortOnMassStoreReset))
	{
		return;
	}

	Endpoint_ClearIN();
}

static uint8_t StreamCallback_MS_Device_AbortOnMassStoreReset(void)
{
	#if !defined(INTERRUPT_CONTROL_ENDPOINT)
	USB_USBTask();
	#endif

	if (*CallbackIsResetSource)
	  return STREAMCALLBACK_Abort;
	else
	  return STREAMCALLBACK_Continue;
}

#endif
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