/* LUFA Library Copyright (C) Dean Camera, 2009. dean [at] fourwalledcubicle [dot] com www.fourwalledcubicle.com */ /* Copyright 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com) Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, 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 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. */ /** \file * * Mass Storage Device commands, to issue MSD commands to the device for * reading device status, capacity, and other characteristics. This file * also contains block read and write functions, so that device blocks * can be read and written. In general, these functions would be chained * to a FAT library to give file-level access to an attached device's contents. */ #define INCLUDE_FROM_MASSSTORE_COMMANDS_C #include "MassStoreCommands.h" /* Globals: */ /** Current CBW to send to the device. This is automatically filled by the routines * in this file and is not externally accessable. */ static CommandBlockWrapper_t SCSICommandBlock; /** Current CSW received from the device. This is automatically filled by the routines * in this file and is externally accessable so that the return codes may be checked. */ CommandStatusWrapper_t SCSICommandStatus; /** Current Tag value used in issued CBWs to the device. This is automatically incremented * by the routines in this file, and is not externally accessable. */ static uint32_t MassStore_Tag = 1; /** Routine to send the current CBW to the device, and increment the Tag value as needed. * * \return A value from the Pipe_Stream_RW_ErrorCodes_t enum */ static uint8_t MassStore_SendCommand(void) { uint8_t ErrorCode = PIPE_RWSTREAM_ERROR_NoError; /* Each transmission should have a unique tag value, excluding valued 0 and 0xFFFFFFFF */ if (++MassStore_Tag == 0xFFFFFFFF) MassStore_Tag = 1; /* Select the OUT data pipe for CBW transmission */ Pipe_SelectPipe(MASS_STORE_DATA_OUT_PIPE); Pipe_Unfreeze(); /* Write the CBW command to the OUT pipe */ if ((ErrorCode = Pipe_Write_Stream_LE(&SCSICommandBlock, sizeof(CommandBlockWrapper_t))) != PIPE_RWSTREAM_ERROR_NoError) return ErrorCode; /* Send the data in the OUT pipe to the attached device */ Pipe_ClearCurrentBank(); /* Some buggy devices require a delay here before the pipe freezing or they will lock up */ USB_Host_WaitMS(1); /* Freeze pipe after use */ Pipe_Freeze(); return PIPE_RWSTREAM_ERROR_NoError; } /** Waits until the attached device is ready to accept data following a CBW, checking * to ensure that the device has not stalled the transaction. * * \return A value from the Pipe_Stream_RW_ErrorCodes_t enum */ static uint8_t MassStore_WaitForDataReceived(void) { uint16_t TimeoutMSRem = COMMAND_DATA_TIMEOUT_MS; /* Unfreeze the OUT pipe so that it can be checked */ Pipe_SelectPipe(MASS_STORE_DATA_OUT_PIPE); Pipe_Unfreeze(); /* Select the IN data pipe for data reception */ Pipe_SelectPipe(MASS_STORE_DATA_IN_PIPE); Pipe_Unfreeze(); /* Wait until data received in the IN pipe */ while (!(Pipe_ReadWriteAllowed())) { /* Check to see if a new frame has been issued (1ms elapsed) */ if (USB_INT_HasOccurred(USB_INT_HSOFI)) { /* Clear the flag and decrement the timout period counter */ USB_INT_Clear(USB_INT_HSOFI); TimeoutMSRem--; /* Check to see if the timeout period for the command has elapsed */ if (!(TimeoutMSRem)) return PIPE_RWSTREAM_ERROR_Timeout; } Pipe_SelectPipe(MASS_STORE_DATA_OUT_PIPE); /* Check if pipe stalled (command failed by device) */ if (Pipe_IsStalled()) { /* Clear the stall condition on the OUT pipe */ MassStore_ClearPipeStall(MASS_STORE_DATA_OUT_PIPE); return PIPE_RWSTREAM_ERROR_PipeStalled; } Pipe_SelectPipe(MASS_STORE_DATA_IN_PIPE); /* Check if pipe stalled (command failed by device) */ if (Pipe_IsStalled()) { /* Clear the stall condition on the IN pipe */ MassStore_ClearPipeStall(MASS_STORE_DATA_IN_PIPE); return PIPE_RWSTREAM_ERROR_PipeStalled; } /* Check to see if the device was disconnected, if so exit function */ if (!(USB_IsConnected)) return PIPE_RWSTREAM_ERROR_DeviceDisconnected; }; return PIPE_RWSTREAM_ERROR_NoError; } /** Sends or receives the transaction's data stage to or from the attached device, reading or * writing to the nominated buffer. * * \param BufferPtr Pointer to the data buffer to read from or write to * * \return A value from the Pipe_Stream_RW_ErrorCodes_t enum */ static uint8_t MassStore_SendReceiveData(void* BufferPtr) { uint8_t ErrorCode = PIPE_RWSTREAM_ERROR_NoError; uint16_t BytesRem = SCSICommandBlock.Header.DataTransferLength; /* Check the direction of the SCSI command data stage */ if (SCSICommandBlock.Header.Flags & COMMAND_DIRECTION_DATA_IN) { /* Select the IN data pipe for data reception */ Pipe_SelectPipe(MASS_STORE_DATA_IN_PIPE); Pipe_Unfreeze(); /* Read in the block data from the pipe */ if ((ErrorCode = Pipe_Read_Stream_LE(BufferPtr, BytesRem)) != PIPE_RWSTREAM_ERROR_NoError) return ErrorCode; } else { /* Select the OUT data pipe for data transmission */ Pipe_SelectPipe(MASS_STORE_DATA_OUT_PIPE); Pipe_Unfreeze(); /* Write the block data to the pipe */ if ((ErrorCode = Pipe_Write_Stream_LE(BufferPtr, BytesRem)) != PIPE_RWSTREAM_ERROR_NoError) return ErrorCode; } /* Acknowledge the packet */ Pipe_ClearCurrentBank(); /* Some buggy devices require a delay here before the pipe freezing or they will lock up */ USB_Host_WaitMS(1); /* Freeze used pipe after use */ Pipe_Freeze(); return PIPE_RWSTREAM_ERROR_NoError; } /** Routine to receive the current CSW from the device. * * \return A value from the Pipe_Stream_RW_ErrorCodes_t enum */ static uint8_t MassStore_GetReturnedStatus(void) { uint8_t ErrorCode = PIPE_RWSTREAM_ERROR_NoError; /* Select the IN data pipe for data reception */ Pipe_SelectPipe(MASS_STORE_DATA_IN_PIPE); Pipe_Unfreeze(); /* Load in the CSW from the attached device */ if ((ErrorCode = Pipe_Read_Stream_LE(&SCSICommandStatus, sizeof(CommandStatusWrapper_t))) != PIPE_RWSTREAM_ERROR_NoError) return ErrorCode; /* Clear the data ready for next reception */ Pipe_ClearCurrentBank(); /* Some buggy devices require a delay here before the pipe freezing or they will lock up */ USB_Host_WaitMS(1); /* Freeze the IN pipe after use */ Pipe_Freeze(); return PIPE_RWSTREAM_ERROR_NoError; } /** Clears the stall condition in the attached device on the nominated endpoint number. * * \param EndpointNum Endpoint number in the attached device whose stall condition is to be cleared * * \return A value from the USB_Host_SendControlErrorCodes_t enum */ uint8_t MassStore_ClearPipeStall(const uint8_t EndpointNum) { USB_HostRequest = (USB_Host_Request_Header_t) { bmRequestType: (REQDIR_HOSTTODEVICE | REQTYPE_STANDARD | REQREC_ENDPOINT), bRequest: REQ_ClearFeature, wValue: FEATURE_ENDPOINT_HALT, wIndex: EndpointNum, wLength: 0, }; return USB_Host_SendControlRequest(NULL); } /** Issues a Mass Storage class specific request to reset the attached device's Mass Storage interface, * readying the device for the next CBW. * * \return A value from the USB_Host_SendControlErrorCodes_t enum */ uint8_t MassStore_MassStorageReset(void) { USB_HostRequest = (USB_Host_Request_Header_t) { bmRequestType: (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE), bRequest: REQ_MassStorageReset, wValue: 0, wIndex: 0, wLength: 0, }; return USB_Host_SendControlRequest(NULL); } /** Issues a Mass Storage class specific request to determine the index of the highest numbered Logical * Unit in the attached device. * * \param MaxLUNIndex Pointer to the location that the maximum LUN index value should be stored * * \return A value from the USB_Host_SendControlErrorCodes_t enum */ uint8_t MassStore_GetMaxLUN(uint8_t* const MaxLUNIndex) { uint8_t ErrorCode; USB_HostRequest = (USB_Host_Request_Header_t) { bmRequestType: (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE), bRequest: REQ_GetMaxLUN, wValue: 0, wIndex: 0, wLength: 1, }; if ((ErrorCode = USB_Host_SendControlRequest(MaxLUNIndex)) == HOST_SENDCONTROL_SetupStalled) { /* Clear the pipe stall */ Pipe_ClearStall(); /* Some faulty Mass Storage devices don't implement the GET_MAX_LUN request, so assume a single LUN */ *MaxLUNIndex = 0; } return ErrorCode; } /** Issues a SCSI Request Sense command to the attached device, to determine the current SCSI sense information. This * gives error codes for the last issued SCSI command to the device. * * \param LUNIndex Index of the LUN inside the device the command is being addressed to * \param SensePtr Pointer to the sense data structure where the sense data from the device is to be stored * * \return A value from the Pipe_Stream_RW_ErrorCodes_t enum */ uint8_t MassStore_RequestSense(const uint8_t LUNIndex, const SCSI_Request_Sense_Response_t* const SensePtr) { uint8_t ReturnCode = PIPE_RWSTREAM_ERROR_NoError; /* Create a CBW with a SCSI command to issue REQUEST SENSE command */ SCSICommandBlock = (CommandBlockWrapper_t) { Header: { Signature: CBW_SIGNATURE, Tag: MassStore_Tag, DataTransferLength: sizeof(SCSI_Request_Sense_Response_t), Flags: COMMAND_DIRECTION_DATA_IN, LUN: LUNIndex, SCSICommandLength: 6 }, SCSICommandData: { SCSI_CMD_REQUEST_SENSE, 0x00, // Reserved 0x00, // Reserved 0x00, // Reserved sizeof(SCSI_Request_Sense_Response_t), // Allocation Length 0x00 // Unused (control) } }; /* Send SCSI command to the attached device */ MassStore_SendCommand(); /* Wait until data received from the device */ if ((ReturnCode = MassStore_WaitForDataReceived()) != PIPE_RWSTREAM_ERROR_NoError) { Pipe_Freeze(); return ReturnCode; } /* Read the returned sense data into the buffer */ if ((ReturnCode = MassStore_SendReceiveData((uint8_t*)SensePtr)) != PIPE_RWSTREAM_ERROR_NoError) { Pipe_Freeze(); return ReturnCode; } /* Read in the returned CSW from the device */ if ((ReturnCode = MassStore_GetReturnedStatus()) != PIPE_RWSTREAM_ERROR_NoError) { Pipe_Freeze(); return ReturnCode; } return PIPE_RWSTREAM_ERROR_NoError; } /** Issues a SCSI Device Block Read command to the attached device, to read in one or more data blocks from the * storage medium into a buffer. * * \param LUNIndex Index of the LUN inside the device the command is being addressed to * \param BlockAddress Start block address to read from * \param Blocks Number of blocks to read from the device * \param BlockSize Size in bytes of each block to read * \param BufferPtr Pointer to the buffer where the read data is to be written to * * \return A value from the Pipe_Stream_RW_ErrorCodes_t enum */ uint8_t MassStore_ReadDeviceBlock(const uint8_t LUNIndex, const uint32_t BlockAddress, const uint8_t Blocks, const uint16_t BlockSize, void* BufferPtr) { uint8_t ReturnCode = PIPE_RWSTREAM_ERROR_NoError; /* Create a CBW with a SCSI command to read in the given blocks from the device */ SCSICommandBlock = (CommandBlockWrapper_t) { Header: { Signature: CBW_SIGNATURE, Tag: MassStore_Tag, DataTransferLength: ((uint32_t)Blocks * BlockSize), Flags: COMMAND_DIRECTION_DATA_IN, LUN: LUNIndex, SCSICommandLength: 10 }, SCSICommandData: { SCSI_CMD_READ_10, 0x00, // Unused (control bits, all off) (BlockAddress >> 24), // MSB of Block Address (BlockAddress >> 16), (BlockAddress >> 8), (BlockAddress & 0xFF), // LSB of Block Address 0x00, // Unused (reserved) 0x00, // MSB of Total Blocks to Read Blocks, // LSB of Total Blocks to Read 0x00 // Unused (control) } }; /* Send SCSI command to the attached device */ MassStore_SendCommand(); /* Wait until data received from the device */ if ((ReturnCode = MassStore_WaitForDataReceived()) != PIPE_RWSTREAM_ERROR_NoError) { Pipe_Freeze(); return ReturnCode; } /* Read the returned block data into the buffer */ if ((ReturnCode = MassStore_SendReceiveData(BufferPtr)) != PIPE_RWSTREAM_ERROR_NoError) { Pipe_Freeze(); return ReturnCode; } /* Read in the returned CSW from the device */ if ((ReturnCode = MassStore_GetReturnedStatus()) != PIPE_RWSTREAM_ERROR_NoError) { Pipe_Freeze(); return ReturnCode; } return PIPE_RWSTREAM_ERROR_NoError; } /** Issues a SCSI Device Block Write command to the attached device, to write one or more data blocks to the * storage medium from a buffer. * * \param LUNIndex Index of the LUN inside the device the command is being addressed to * \param BlockAddress Start block address to write to * \param Blocks Number of blocks to write to in the device * \param BlockSize Size in bytes of each block to write * \param BufferPtr Pointer to the buffer where the write data is to be sourced from * * \return A value from the Pipe_Stream_RW_ErrorCodes_t enum */ uint8_t MassStore_WriteDeviceBlock(const uint8_t LUNIndex, const uint32_t BlockAddress, const uint8_t Blocks, const uint16_t BlockSize, void* BufferPtr) { uint8_t ReturnCode = PIPE_RWSTREAM_ERROR_NoError; /* Create a CBW with a SCSI command to write the given blocks to the device */ SCSICommandBlock = (CommandBlockWrapper_t) { Header: { Signature: CBW_SIGNATURE, Tag: MassStore_Tag, DataTransferLength: ((uint32_t)Blocks * BlockSize), Flags: COMMAND_DIRECTION_DATA_OUT, LUN: LUNIndex, SCSICommandLength: 10 }, SCSICommandData: { SCSI_CMD_WRITE_10, 0x00, // Unused (control bits, all off) (BlockAddress >> 24), // MSB of Block Address (BlockAddress >> 16), (BlockAddress >> 8), (BlockAddress & 0xFF), // LSB of Block Address 0x00, // Unused (reserved) 0x00, // MSB of Total Blocks to Write Blocks, // LSB of Total Blocks to Write 0x00 // Unused (control) } }; /* Send SCSI command to the attached device */ MassStore_SendCommand(); /* Write the data to the device from the buffer */ if ((ReturnCode = MassStore_SendReceiveData(BufferPtr)) != PIPE_RWSTREAM_ERROR_NoError) { Pipe_Freeze(); return ReturnCode; } /* Read in the returned CSW from the device */ if ((ReturnCode = MassStore_GetReturnedStatus()) != PIPE_RWSTREAM_ERROR_NoError) { Pipe_Freeze(); return ReturnCode; } return PIPE_RWSTREAM_ERROR_NoError; } /** Issues a SCSI Device Test Unit Ready command to the attached device, to determine if the device is ready to accept * other commands. * * \param LUNIndex Index of the LUN inside the device the command is being addressed to * * \return A value from the Pipe_Stream_RW_ErrorCodes_t enum */ uint8_t MassStore_TestUnitReady(const uint8_t LUNIndex) { uint8_t ReturnCode = PIPE_RWSTREAM_ERROR_NoError; /* Create a CBW with a SCSI command to issue TEST UNIT READY command */ SCSICommandBlock = (CommandBlockWrapper_t) { Header: { Signature: CBW_SIGNATURE, Tag: MassStore_Tag, DataTransferLength: 0, Flags: COMMAND_DIRECTION_DATA_IN, LUN: LUNIndex, SCSICommandLength: 6 }, SCSICommandData: { SCSI_CMD_TEST_UNIT_READY, 0x00, // Reserved 0x00, // Reserved 0x00, // Reserved 0x00, // Reserved 0x00 // Unused (control) } }; /* Send SCSI command to the attached device */ MassStore_SendCommand(); /* Read in the returned CSW from the device */ if ((ReturnCode = MassStore_GetReturnedStatus()) != PIPE_RWSTREAM_ERROR_NoError) { Pipe_Freeze(); return ReturnCode; } return PIPE_RWSTREAM_ERROR_NoError; } /** Issues a SCSI Device Read Capacity command to the attached device, to determine the capacity of the * given Logical Unit within the device. * * \param LUNIndex Index of the LUN inside the device the command is being addressed to * \param CapacityPtr Device capacity structure where the capacity data is to be stored * * \return A value from the Pipe_Stream_RW_ErrorCodes_t enum */ uint8_t MassStore_ReadCapacity(const uint8_t LUNIndex, SCSI_Capacity_t* const CapacityPtr) { uint8_t ReturnCode = PIPE_RWSTREAM_ERROR_NoError; /* Create a CBW with a SCSI command to issue READ CAPACITY command */ SCSICommandBlock = (CommandBlockWrapper_t) { Header: { Signature: CBW_SIGNATURE, Tag: MassStore_Tag, DataTransferLength: 8, Flags: COMMAND_DIRECTION_DATA_IN, LUN: LUNIndex, SCSICommandLength: 10 }, SCSICommandData: { SCSI_CMD_READ_CAPACITY_10, 0x00, // Reserved 0x00, // MSB of Logical block address 0x00, 0x00, 0x00, // LSB of Logical block address 0x00, // Reserved 0x00, // Reserved 0x00, // Partial Medium Indicator 0x00 // Unused (control) } }; /* Send SCSI command to the attached device */ MassStore_SendCommand(); /* Wait until data received from the device */ if ((ReturnCode = MassStore_WaitForDataReceived()) != PIPE_RWSTREAM_ERROR_NoError) { Pipe_Freeze(); return ReturnCode; } /* Read the returned capacity data into the buffer */ if ((ReturnCode = MassStore_SendReceiveData(CapacityPtr)) != PIPE_RWSTREAM_ERROR_NoError) { Pipe_Freeze(); return ReturnCode; } /* Endian-correct the read data */ CapacityPtr->Blocks = SwapEndian_32(CapacityPtr->Blocks); CapacityPtr->BlockSize = SwapEndian_32(CapacityPtr->BlockSize); /* Read in the returned CSW from the device */ if ((ReturnCode = MassStore_GetReturnedStatus()) != PIPE_RWSTREAM_ERROR_NoError) { Pipe_Freeze(); return ReturnCode; } return PIPE_RWSTREAM_ERROR_NoError; } /** Issues a SCSI Device Prevent/Allow Medium Removal command to the attached device, to lock the physical media from * being removed. This is a legacy command for SCSI disks with removable storage (such as ZIP disks), but should still * be issued before the first read or write command is sent. * * \param LUNIndex Index of the LUN inside the device the command is being addressed to * \param PreventRemoval Whether or not the LUN media should be locked to prevent removal or not * * \return A value from the Pipe_Stream_RW_ErrorCodes_t enum */ uint8_t MassStore_PreventAllowMediumRemoval(const uint8_t LUNIndex, const bool PreventRemoval) { uint8_t ReturnCode = PIPE_RWSTREAM_ERROR_NoError; /* Create a CBW with a SCSI command to issue PREVENT ALLOW MEDIUM REMOVAL command */ SCSICommandBlock = (CommandBlockWrapper_t) { Header: { Signature: CBW_SIGNATURE, Tag: MassStore_Tag, DataTransferLength: 0, Flags: COMMAND_DIRECTION_DATA_OUT, LUN: LUNIndex, SCSICommandLength: 6 }, SCSICommandData: { SCSI_CMD_PREVENT_ALLOW_MEDIUM_REMOVAL, 0x00, // Reserved 0x00, // Reserved PreventRemoval, // Prevent flag 0x00, // Reserved 0x00 // Unused (control) } }; /* Send SCSI command to the attached device */ MassStore_SendCommand(); /* Read in the returned CSW from the device */ if ((ReturnCode = MassStore_GetReturnedStatus()) != PIPE_RWSTREAM_ERROR_NoError) { Pipe_Freeze(); return ReturnCode; } return PIPE_RWSTREAM_ERROR_NoError; }