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Added ability to write protect Mass Storage disk write operations from the host OS.

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This commit is contained in:
Dean Camera 2010-11-26 04:16:47 +00:00
parent b634ec50a0
commit 9f7883fa2b
20 changed files with 252 additions and 16 deletions
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39
Projects/Incomplete/StandaloneProgrammer/Lib/SCSI.c
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@ -114,6 +114,9 @@ bool SCSI_DecodeSCSICommand(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
case SCSI_CMD_READ_10:
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:
@ -282,6 +285,17 @@ static bool SCSI_Command_ReadWrite_10(USB_ClassInfo_MS_Device_t* const MSInterfa
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]);
@ -298,7 +312,7 @@ static bool SCSI_Command_ReadWrite_10(USB_ClassInfo_MS_Device_t* const MSInterfa
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);
@ -310,5 +324,26 @@ static bool SCSI_Command_ReadWrite_10(USB_ClassInfo_MS_Device_t* const MSInterfa
return true;
}
#endif
/** 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_Byte(0x00);
Endpoint_Write_Byte(0x00);
Endpoint_Write_Byte(DISK_READ_ONLY ? 0x80 : 0x00);
Endpoint_Write_Byte(0x00);
Endpoint_ClearIN();
/* Update the bytes transferred counter and succeed the command */
MSInterfaceInfo->State.CommandBlock.DataTransferLength -= 4;
return true;
}
#endif