Add SCSICodes.h to the Class Driver Common folder, and automatically include it in both the Host and Device Mass Storage Class drivers. Delete existing version from the ClassDriver MassStorage device demo's /Lib/ folder.

Demos/Device/ClassDriver/MassStorage/Lib/SCSI.h

@@ -46,7 +46,6 @@
 		#include "MassStorage.h"
 		#include "Descriptors.h"
 		#include "DataflashManager.h"
-		#include "SCSI_Codes.h"
 	
 	/* Macros: */
 		/** Macro to set the current SCSI sense data to the given key, additional sense code and additional sense qualifier. This

Demos/Host/ClassDriver/MassStorageHost/MassStorageHost.c

@@ -139,7 +139,7 @@ int main(void)
 				}
 
 				SCSI_Inquiry_Response_t InquiryData;
-				if (MS_Host_GetInquiryData(&FlashDisk_MS_Interface, &InquiryData))
+				if (MS_Host_GetInquiryData(&FlashDisk_MS_Interface, 0, &InquiryData))
 				{
 					printf("Error retreiving device Inquiry data.\r\n");
 					LEDs_SetAllLEDs(LEDMASK_USB_ERROR);

LUFA/Drivers/USB/Class/Device/MassStorage.h

@@ -47,7 +47,8 @@
 	/* Includes: */
 		#include "../../USB.h"
 		#include "../Common/MassStorage.h"
-
+		#include "../Common/SCSICodes.h"
+		
 		#include <string.h>
 
 	/* Enable C linkage for C++ Compilers: */

LUFA/Drivers/USB/Class/Host/MassStorage.c

@@ -310,11 +310,53 @@ uint8_t MS_Host_GetMaxLUN(USB_ClassInfo_MS_Host_t* MSInterfaceInfo, uint8_t* Max
 	return ErrorCode;
 }
 
-uint8_t MS_Host_GetInquiryData(USB_ClassInfo_MS_Host_t* MSInterfaceInfo, SCSI_Inquiry_Response_t* InquiryData)
+uint8_t MS_Host_GetInquiryData(USB_ClassInfo_MS_Host_t* MSInterfaceInfo, uint8_t LUNIndex, SCSI_Inquiry_Response_t* InquiryData)
 {
 	if ((USB_HostState != HOST_STATE_Configured) || !(MSInterfaceInfo->State.Active))
 	  return HOST_SENDCONTROL_DeviceDisconnect;
+	  
+	uint8_t ErrorCode = PIPE_RWSTREAM_NoError;
+
+	MS_CommandBlockWrapper_t SCSICommandBlock = (MS_CommandBlockWrapper_t)
+		{
+			.Signature          = CBW_SIGNATURE,
+			.Tag                = MSInterfaceInfo->State.TransactionTag,
+			.DataTransferLength = sizeof(SCSI_Inquiry_Response_t),
+			.Flags              = COMMAND_DIRECTION_DATA_IN,
+			.LUN                = LUNIndex,
+			.SCSICommandLength  = 6,
+			.SCSICommandData    =
+				{
+					SCSI_CMD_INQUIRY,
+					0x00,                   // Reserved
+					0x00,                   // Reserved
+					0x00,                   // Reserved
+					sizeof(SCSI_Inquiry_Response_t), // Allocation Length
+					0x00                    // Unused (control)
+				}
+		};
+	
+	MassStore_SendCommand(MSInterfaceInfo, &SCSICommandBlock);
+
+	if ((ErrorCode = MassStore_WaitForDataReceived()) != PIPE_RWSTREAM_NoError)
+	{
+		Pipe_Freeze();
+		return ErrorCode;
+	}
 
+	if ((ErrorCode = MassStore_SendReceiveData(MSInterfaceInfo, (uint8_t*)InquiryPtr)) != PIPE_RWSTREAM_NoError)
+	{
+		Pipe_Freeze();
+		return ErrorCode;
+	}	
+	
+	if ((ErrorCode = MassStore_GetReturnedStatus(MSInterfaceInfo)) != PIPE_RWSTREAM_NoError)
+	{
+		Pipe_Freeze();
+		return ErrorCode;
+	}
+	
+	return ErrorCode;
 }
 
 uint8_t MS_Host_TestUnitReady(USB_ClassInfo_MS_Host_t* MSInterfaceInfo, uint8_t LUNIndex, bool* DeviceReady);

LUFA/Drivers/USB/Class/Host/MassStorage.h

@@ -47,6 +47,7 @@
 	/* Includes: */
 		#include "../../USB.h"
 		#include "../Common/MassStorage.h"
+		#include "../Common/SCSICodes.h"
 		
 	/* Enable C linkage for C++ Compilers: */
 		#if defined(__cplusplus)
@@ -210,8 +211,8 @@
 			 */
 			uint8_t MS_Host_GetMaxLUN(USB_ClassInfo_MS_Host_t* MSInterfaceInfo, uint8_t* MaxLUNIndex) ATTR_NON_NULL_PTR_ARG(1, 2);
 
-			uint8_t MS_Host_GetInquiryData(USB_ClassInfo_MS_Host_t* MSInterfaceInfo,
-			                               SCSI_Inquiry_Response_t* InquiryData) ATTR_NON_NULL_PTR_ARG(1, 2);
+			uint8_t MS_Host_GetInquiryData(USB_ClassInfo_MS_Host_t* MSInterfaceInfo, uint8_t LUNIndex,
+			                               SCSI_Inquiry_Response_t* InquiryData) ATTR_NON_NULL_PTR_ARG(1, 3);
 
 			uint8_t MS_Host_TestUnitReady(USB_ClassInfo_MS_Host_t* MSInterfaceInfo, uint8_t LUNIndex,
 			                              bool* DeviceReady) ATTR_NON_NULL_PTR_ARG(1, 3);