/*
LUFA Library
- Copyright (C) Dean Camera, 2010.
-
+ Copyright (C) Dean Camera, 2012.
+
dean [at] fourwalledcubicle [dot] com
- www.fourwalledcubicle.com
+ www.lufa-lib.org
*/
/*
- Copyright 2010 Dean Camera (dean [at] fourwalledcubicle [dot] com)
+ Copyright 2012 Dean Camera (dean [at] fourwalledcubicle [dot] com)
- Permission to use, copy, modify, distribute, and sell this
+ Permission to use, copy, modify, distribute, and sell this
software and its documentation for any purpose is hereby granted
- without fee, provided that the above copyright notice appear in
+ without fee, 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
+ 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
* devices use a thin "Bulk-Only Transport" protocol for issuing commands and status information,
* which wrap around standard SCSI device commands for controlling the actual storage medium.
*/
-
+
#define INCLUDE_FROM_SCSI_C
#include "SCSI.h"
/** Structure to hold the SCSI response data to a SCSI INQUIRY command. This gives information about the device's
* features and capabilities.
*/
-SCSI_Inquiry_Response_t InquiryData =
+static const SCSI_Inquiry_Response_t InquiryData =
{
.DeviceType = DEVICE_TYPE_BLOCK,
.PeripheralQualifier = 0,
-
+
.Removable = true,
-
+
.Version = 0,
-
+
.ResponseDataFormat = 2,
.NormACA = false,
.TrmTsk = false,
.AERC = false,
.AdditionalLength = 0x1F,
-
+
.SoftReset = false,
.CmdQue = false,
.Linked = false,
.WideBus16Bit = false,
.WideBus32Bit = false,
.RelAddr = false,
-
+
.VendorID = "LUFA",
.ProductID = "Dataflash Disk",
.RevisionID = {'0','.','0','0'},
/** Structure to hold the sense data for the last issued SCSI command, which is returned to the host after a SCSI REQUEST SENSE
* command is issued. This gives information on exactly why the last command failed to complete.
*/
-SCSI_Request_Sense_Response_t SenseData =
+static SCSI_Request_Sense_Response_t SenseData =
{
.ResponseCode = 0x70,
.AdditionalLength = 0x0A,
* a command failure due to a ILLEGAL REQUEST.
*
* \param[in] MSInterfaceInfo Pointer to the Mass Storage class interface structure that the command is associated with
+ *
+ * \return Boolean true if the command completed successfully, false otherwise
*/
bool SCSI_DecodeSCSICommand(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
{
- /* Set initial sense data, before the requested command is processed */
- SCSI_SET_SENSE(SCSI_SENSE_KEY_GOOD,
- SCSI_ASENSE_NO_ADDITIONAL_INFORMATION,
- SCSI_ASENSEQ_NO_QUALIFIER);
-
+ bool CommandSuccess = false;
+
/* Run the appropriate SCSI command hander function based on the passed command */
switch (MSInterfaceInfo->State.CommandBlock.SCSICommandData[0])
{
case SCSI_CMD_INQUIRY:
- SCSI_Command_Inquiry(MSInterfaceInfo);
+ CommandSuccess = SCSI_Command_Inquiry(MSInterfaceInfo);
break;
case SCSI_CMD_REQUEST_SENSE:
- SCSI_Command_Request_Sense(MSInterfaceInfo);
+ CommandSuccess = SCSI_Command_Request_Sense(MSInterfaceInfo);
break;
case SCSI_CMD_READ_CAPACITY_10:
- SCSI_Command_Read_Capacity_10(MSInterfaceInfo);
+ CommandSuccess = SCSI_Command_Read_Capacity_10(MSInterfaceInfo);
break;
case SCSI_CMD_SEND_DIAGNOSTIC:
- SCSI_Command_Send_Diagnostic(MSInterfaceInfo);
+ CommandSuccess = SCSI_Command_Send_Diagnostic(MSInterfaceInfo);
break;
case SCSI_CMD_WRITE_10:
- SCSI_Command_ReadWrite_10(MSInterfaceInfo, DATA_WRITE);
+ CommandSuccess = SCSI_Command_ReadWrite_10(MSInterfaceInfo, DATA_WRITE);
break;
case SCSI_CMD_READ_10:
- SCSI_Command_ReadWrite_10(MSInterfaceInfo, DATA_READ);
+ CommandSuccess = SCSI_Command_ReadWrite_10(MSInterfaceInfo, DATA_READ);
+ break;
+ case SCSI_CMD_MODE_SENSE_6:
+ CommandSuccess = SCSI_Command_ModeSense_6(MSInterfaceInfo);
break;
case SCSI_CMD_TEST_UNIT_READY:
case SCSI_CMD_PREVENT_ALLOW_MEDIUM_REMOVAL:
case SCSI_CMD_VERIFY_10:
/* These commands should just succeed, no handling required */
+ CommandSuccess = true;
MSInterfaceInfo->State.CommandBlock.DataTransferLength = 0;
break;
default:
break;
}
- return (SenseData.SenseKey == SCSI_SENSE_KEY_GOOD);
+ /* Check if command was successfully processed */
+ if (CommandSuccess)
+ {
+ SCSI_SET_SENSE(SCSI_SENSE_KEY_GOOD,
+ SCSI_ASENSE_NO_ADDITIONAL_INFORMATION,
+ SCSI_ASENSEQ_NO_QUALIFIER);
+
+ return true;
+ }
+
+ return false;
}
/** Command processing for an issued SCSI INQUIRY command. This command returns information about the device's features
* and capabilities to the host.
*
* \param[in] MSInterfaceInfo Pointer to the Mass Storage class interface structure that the command is associated with
+ *
+ * \return Boolean true if the command completed successfully, false otherwise.
*/
-static void SCSI_Command_Inquiry(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
+static bool SCSI_Command_Inquiry(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
{
- uint16_t AllocationLength = (((uint16_t)MSInterfaceInfo->State.CommandBlock.SCSICommandData[3] << 8) |
- MSInterfaceInfo->State.CommandBlock.SCSICommandData[4]);
- uint16_t BytesTransferred = (AllocationLength < sizeof(InquiryData))? AllocationLength :
- sizeof(InquiryData);
+ uint16_t AllocationLength = SwapEndian_16(*(uint16_t*)&MSInterfaceInfo->State.CommandBlock.SCSICommandData[3]);
+ uint16_t BytesTransferred = MIN(AllocationLength, sizeof(InquiryData));
/* Only the standard INQUIRY data is supported, check if any optional INQUIRY bits set */
if ((MSInterfaceInfo->State.CommandBlock.SCSICommandData[1] & ((1 << 0) | (1 << 1))) ||
SCSI_ASENSE_INVALID_FIELD_IN_CDB,
SCSI_ASENSEQ_NO_QUALIFIER);
- return;
+ return false;
}
-
- Endpoint_Write_Stream_LE(&InquiryData, BytesTransferred, NO_STREAM_CALLBACK);
- uint8_t PadBytes[AllocationLength - BytesTransferred];
-
+ Endpoint_Write_Stream_LE(&InquiryData, BytesTransferred, NULL);
+
/* Pad out remaining bytes with 0x00 */
- Endpoint_Write_Stream_LE(&PadBytes, (AllocationLength - BytesTransferred), NO_STREAM_CALLBACK);
+ Endpoint_Null_Stream((AllocationLength - BytesTransferred), NULL);
/* Finalize the stream transfer to send the last packet */
Endpoint_ClearIN();
/* Succeed the command and update the bytes transferred counter */
MSInterfaceInfo->State.CommandBlock.DataTransferLength -= BytesTransferred;
+
+ return true;
}
/** Command processing for an issued SCSI REQUEST SENSE command. This command returns information about the last issued command,
* including the error code and additional error information so that the host can determine why a command failed to complete.
*
* \param[in] MSInterfaceInfo Pointer to the Mass Storage class interface structure that the command is associated with
+ *
+ * \return Boolean true if the command completed successfully, false otherwise.
*/
-static void SCSI_Command_Request_Sense(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
+static bool SCSI_Command_Request_Sense(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
{
uint8_t AllocationLength = MSInterfaceInfo->State.CommandBlock.SCSICommandData[4];
- uint8_t BytesTransferred = (AllocationLength < sizeof(SenseData))? AllocationLength : sizeof(SenseData);
-
- uint8_t PadBytes[AllocationLength - BytesTransferred];
+ uint8_t BytesTransferred = MIN(AllocationLength, sizeof(SenseData));
- Endpoint_Write_Stream_LE(&SenseData, BytesTransferred, NO_STREAM_CALLBACK);
- Endpoint_Write_Stream_LE(&PadBytes, (AllocationLength - BytesTransferred), NO_STREAM_CALLBACK);
+ Endpoint_Write_Stream_LE(&SenseData, BytesTransferred, NULL);
+ Endpoint_Null_Stream((AllocationLength - BytesTransferred), NULL);
Endpoint_ClearIN();
/* Succeed the command and update the bytes transferred counter */
MSInterfaceInfo->State.CommandBlock.DataTransferLength -= BytesTransferred;
+
+ return true;
}
/** Command processing for an issued SCSI READ CAPACITY (10) command. This command returns information about the device's capacity
* on the selected Logical Unit (drive), as a number of OS-sized blocks.
*
* \param[in] MSInterfaceInfo Pointer to the Mass Storage class interface structure that the command is associated with
+ *
+ * \return Boolean true if the command completed successfully, false otherwise.
*/
-static void SCSI_Command_Read_Capacity_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
+static bool SCSI_Command_Read_Capacity_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
{
uint32_t LastBlockAddressInLUN = (VIRTUAL_MEMORY_BLOCKS - 1);
uint32_t MediaBlockSize = VIRTUAL_MEMORY_BLOCK_SIZE;
- Endpoint_Write_Stream_BE(&LastBlockAddressInLUN, sizeof(LastBlockAddressInLUN), NO_STREAM_CALLBACK);
- Endpoint_Write_Stream_BE(&MediaBlockSize, sizeof(MediaBlockSize), NO_STREAM_CALLBACK);
+ Endpoint_Write_Stream_BE(&LastBlockAddressInLUN, sizeof(LastBlockAddressInLUN), NULL);
+ Endpoint_Write_Stream_BE(&MediaBlockSize, sizeof(MediaBlockSize), NULL);
Endpoint_ClearIN();
-
+
/* Succeed the command and update the bytes transferred counter */
MSInterfaceInfo->State.CommandBlock.DataTransferLength -= 8;
+
+ return true;
}
/** Command processing for an issued SCSI SEND DIAGNOSTIC command. This command performs a quick check of the Dataflash ICs on the
* supported.
*
* \param[in] MSInterfaceInfo Pointer to the Mass Storage class interface structure that the command is associated with
+ *
+ * \return Boolean true if the command completed successfully, false otherwise.
*/
-static void SCSI_Command_Send_Diagnostic(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
+static bool SCSI_Command_Send_Diagnostic(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
{
/* Check to see if the SELF TEST bit is not set */
if (!(MSInterfaceInfo->State.CommandBlock.SCSICommandData[1] & (1 << 2)))
SCSI_ASENSE_INVALID_FIELD_IN_CDB,
SCSI_ASENSEQ_NO_QUALIFIER);
- return;
+ return false;
}
-
+
/* Check to see if all attached Dataflash ICs are functional */
if (!(DataflashManager_CheckDataflashOperation()))
{
/* Update SENSE key with a hardware error condition and return command fail */
SCSI_SET_SENSE(SCSI_SENSE_KEY_HARDWARE_ERROR,
SCSI_ASENSE_NO_ADDITIONAL_INFORMATION,
- SCSI_ASENSEQ_NO_QUALIFIER);
-
- return;
+ SCSI_ASENSEQ_NO_QUALIFIER);
+
+ return false;
}
-
+
/* Succeed the command and update the bytes transferred counter */
MSInterfaceInfo->State.CommandBlock.DataTransferLength = 0;
+
+ return true;
}
/** Command processing for an issued SCSI READ (10) or WRITE (10) command. This command reads in the block start address
- * and total number of blocks to process, then calls the appropriate low-level dataflash routine to handle the actual
+ * and total number of blocks to process, then calls the appropriate low-level Dataflash routine to handle the actual
* reading and writing of the data.
*
* \param[in] MSInterfaceInfo Pointer to the Mass Storage class interface structure that the command is associated with
* \param[in] IsDataRead Indicates if the command is a READ (10) command or WRITE (10) command (DATA_READ or DATA_WRITE)
+ *
+ * \return Boolean true if the command completed successfully, false otherwise.
*/
-static void SCSI_Command_ReadWrite_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo, const bool IsDataRead)
+static bool SCSI_Command_ReadWrite_10(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo,
+ const bool IsDataRead)
{
uint32_t BlockAddress;
uint16_t TotalBlocks;
-
+
+ /* Check if the disk is write protected or not */
+ if ((IsDataRead == DATA_WRITE) && DISK_READ_ONLY)
+ {
+ /* Block address is invalid, update SENSE key and return command fail */
+ SCSI_SET_SENSE(SCSI_SENSE_KEY_DATA_PROTECT,
+ SCSI_ASENSE_WRITE_PROTECTED,
+ SCSI_ASENSEQ_NO_QUALIFIER);
+
+ return false;
+ }
+
/* Load in the 32-bit block address (SCSI uses big-endian, so have to reverse the byte order) */
BlockAddress = SwapEndian_32(*(uint32_t*)&MSInterfaceInfo->State.CommandBlock.SCSICommandData[2]);
/* Load in the 16-bit total blocks (SCSI uses big-endian, so have to reverse the byte order) */
- TotalBlocks = SwapEndian_16(*(uint32_t*)&MSInterfaceInfo->State.CommandBlock.SCSICommandData[7]);
-
+ TotalBlocks = SwapEndian_16(*(uint16_t*)&MSInterfaceInfo->State.CommandBlock.SCSICommandData[7]);
+
/* Check if the block address is outside the maximum allowable value for the LUN */
if (BlockAddress >= VIRTUAL_MEMORY_BLOCKS)
{
SCSI_ASENSE_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE,
SCSI_ASENSEQ_NO_QUALIFIER);
- return;
+ return false;
}
-
+
/* Determine if the packet is a READ (10) or WRITE (10) command, call appropriate function */
if (IsDataRead == DATA_READ)
DataflashManager_ReadBlocks(MSInterfaceInfo, BlockAddress, TotalBlocks);
/* Update the bytes transferred counter and succeed the command */
MSInterfaceInfo->State.CommandBlock.DataTransferLength -= ((uint32_t)TotalBlocks * VIRTUAL_MEMORY_BLOCK_SIZE);
+
+ return true;
+}
+
+/** Command processing for an issued SCSI MODE SENSE (6) command. This command returns various informational pages about
+ * the SCSI device, as well as the device's Write Protect status.
+ *
+ * \param[in] MSInterfaceInfo Pointer to the Mass Storage class interface structure that the command is associated with
+ *
+ * \return Boolean true if the command completed successfully, false otherwise.
+ */
+static bool SCSI_Command_ModeSense_6(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
+{
+ /* Send an empty header response with the Write Protect flag status */
+ Endpoint_Write_8(0x00);
+ Endpoint_Write_8(0x00);
+ Endpoint_Write_8(DISK_READ_ONLY ? 0x80 : 0x00);
+ Endpoint_Write_8(0x00);
+ Endpoint_ClearIN();
+
+ /* Update the bytes transferred counter and succeed the command */
+ MSInterfaceInfo->State.CommandBlock.DataTransferLength -= 4;
+
+ return true;
}
#endif
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