USB Mass Storage Class (MSC) protocol definitions

Modules
	SCSI Block Commands protocol definitions
	SCSI Primary Commands protocol definitions

Data Structures
struct	usb_msc_cbw
struct	usb_msc_csw

Enumerations
enum	usb_reqid_msc {   USB_REQ_MSC_BULK_RESET = 0xFF,   USB_REQ_MSC_GET_MAX_LUN = 0xFE }
	MSC USB requests (bRequest) More...

Possible Class value
#define	MSC_CLASS   0x08

Possible SubClass value
Note In practise, most devices should use MSC_SUBCLASS_TRANSPARENT and specify the actual command set in the standard INQUIRY data block, even if the MSC spec indicates otherwise. In particular, RBC is not supported by certain major operating systems like Windows XP.
#define	MSC_SUBCLASS_RBC   0x01
	Reduced Block Commands. More...
#define	MSC_SUBCLASS_ATAPI   0x02
	CD/DVD devices. More...
#define	MSC_SUBCLASS_QIC_157   0x03
	Tape devices. More...
#define	MSC_SUBCLASS_UFI   0x04
	Floppy disk drives. More...
#define	MSC_SUBCLASS_SFF_8070I   0x05
	Floppy disk drives. More...
#define	MSC_SUBCLASS_TRANSPARENT   0x06
	Determined by INQUIRY. More...

Possible protocol value
Note Only the BULK protocol should be used in new designs.
#define	MSC_PROTOCOL_CBI   0x00
	Command/Bulk/Interrupt. More...
#define	MSC_PROTOCOL_CBI_ALT   0x01
	W/o command completion. More...
#define	MSC_PROTOCOL_BULK   0x50
	Bulk-only. More...

A Command Block Wrapper (CBW).
#define	USB_CBW_SIGNATURE   0x55534243
	dCBWSignature value More...
#define	USB_CBW_DIRECTION_IN   (1<<7)
	Data from device to host. More...
#define	USB_CBW_DIRECTION_OUT   (0<<7)
	Data from host to device. More...
#define	USB_CBW_LUN_MASK   0x0F
	Valid bits in bCBWLUN. More...
#define	USB_CBW_LEN_MASK   0x1F
	Valid bits in bCBWCBLength. More...

A Command Status Wrapper (CSW).
#define	USB_CSW_SIGNATURE   0x55534253
	dCSWSignature value More...
#define	USB_CSW_STATUS_PASS   0x00
	Command Passed. More...
#define	USB_CSW_STATUS_FAIL   0x01
	Command Failed. More...
#define	USB_CSW_STATUS_PE   0x02
	Phase Error. More...

#define MSC_CLASS   0x08

#define MSC_PROTOCOL_BULK   0x50

Bulk-only.

#define MSC_PROTOCOL_CBI   0x00

Command/Bulk/Interrupt.

#define MSC_PROTOCOL_CBI_ALT   0x01

W/o command completion.

#define MSC_SUBCLASS_ATAPI   0x02

CD/DVD devices.

#define MSC_SUBCLASS_QIC_157   0x03

Tape devices.

#define MSC_SUBCLASS_RBC   0x01

Reduced Block Commands.

#define MSC_SUBCLASS_SFF_8070I   0x05

Floppy disk drives.

#define MSC_SUBCLASS_TRANSPARENT   0x06

Determined by INQUIRY.

#define MSC_SUBCLASS_UFI   0x04

Floppy disk drives.

#define USB_CBW_DIRECTION_IN   (1<<7)

Data from device to host.

#define USB_CBW_DIRECTION_OUT   (0<<7)

Data from host to device.

#define USB_CBW_LEN_MASK   0x1F

Valid bits in bCBWCBLength.

#define USB_CBW_LUN_MASK   0x0F

Valid bits in bCBWLUN.

#define USB_CBW_SIGNATURE   0x55534243

dCBWSignature value

#define USB_CSW_SIGNATURE   0x55534253

dCSWSignature value

#define USB_CSW_STATUS_FAIL   0x01

Command Failed.

#define USB_CSW_STATUS_PASS   0x00

Command Passed.

#define USB_CSW_STATUS_PE   0x02

Phase Error.

enum usb_reqid_msc

MSC USB requests (bRequest)

Enumerator
USB_REQ_MSC_BULK_RESET	Mass Storage Reset.
USB_REQ_MSC_GET_MAX_LUN	Get Max LUN.