/** Main routine to process the SCSI command located in the Command Block Wrapper read from the host. This dispatches
* to the appropriate SCSI command handling routine if the issued command is supported by the device, else it returns
* 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 \c true if the command completed successfully, \c false otherwise
*/
bool SCSI_DecodeSCSICommand(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
{
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:
CommandSuccess = SCSI_Command_Inquiry(MSInterfaceInfo);
break;
case SCSI_CMD_REQUEST_SENSE:
CommandSuccess = SCSI_Command_Request_Sense(MSInterfaceInfo);
break;
case SCSI_CMD_READ_CAPACITY_10:
CommandSuccess = SCSI_Command_Read_Capacity_10(MSInterfaceInfo);
break;
case SCSI_CMD_WRITE_10:
CommandSuccess = SCSI_Command_ReadWrite_10(MSInterfaceInfo, DATA_WRITE);
break;
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_START_STOP_UNIT:
#if !defined(NO_APP_START_ON_EJECT)
/* If the user ejected the volume, signal bootloader exit at next opportunity. */
RunBootloader = ((MSInterfaceInfo->State.CommandBlock.SCSICommandData[4] & 0x03) != 0x02);
#endif
case SCSI_CMD_SEND_DIAGNOSTIC:
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:
/* Update the SENSE key to reflect the invalid command */
SCSI_SET_SENSE(SCSI_SENSE_KEY_ILLEGAL_REQUEST,
SCSI_ASENSE_INVALID_COMMAND,
SCSI_ASENSEQ_NO_QUALIFIER);
break;
}
/* 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;
}
/** Main routine to process the SCSI command located in the Command Block Wrapper read from the host. This dispatches
* to the appropriate SCSI command handling routine if the issued command is supported by the device, else it returns
* a command failure due to a ILLEGAL REQUEST.
*
* \return Boolean true if the command completed successfully, false otherwise
*/
bool SCSI_DecodeSCSICommand(void)
{
bool CommandSuccess = false;
/* Run the appropriate SCSI command hander function based on the passed command */
switch (CommandBlock.SCSICommandData[0])
{
case SCSI_CMD_INQUIRY:
CommandSuccess = SCSI_Command_Inquiry();
break;
case SCSI_CMD_REQUEST_SENSE:
CommandSuccess = SCSI_Command_Request_Sense();
break;
case SCSI_CMD_READ_CAPACITY_10:
CommandSuccess = SCSI_Command_Read_Capacity_10();
break;
case SCSI_CMD_SEND_DIAGNOSTIC:
CommandSuccess = SCSI_Command_Send_Diagnostic();
break;
case SCSI_CMD_WRITE_10:
CommandSuccess = SCSI_Command_ReadWrite_10(DATA_WRITE);
break;
case SCSI_CMD_READ_10:
CommandSuccess = SCSI_Command_ReadWrite_10(DATA_READ);
break;
case SCSI_CMD_MODE_SENSE_6:
CommandSuccess = SCSI_Command_ModeSense_6();
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;
CommandBlock.DataTransferLength = 0;
break;
default:
/* Update the SENSE key to reflect the invalid command */
SCSI_SET_SENSE(SCSI_SENSE_KEY_ILLEGAL_REQUEST,
SCSI_ASENSE_INVALID_COMMAND,
SCSI_ASENSEQ_NO_QUALIFIER);
break;
}
/* 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;
}
