Mass Storage Class Definitions
[USB Protocol Definitions]

Collaboration diagram for Mass Storage Class Definitions:

Data Structures
struct	usb_msc_cbw
	A Command Block Wrapper (CBW). More...
struct	usb_msc_csw
	A Command Status Wrapper (CSW). More...
Defines
#define	USB_CBW_SIGNATURE   0x43425355
	dCBWSignature value
#define	USB_CBW_DIRECTION_IN   (1 << 7)
	Data from device to host.
#define	USB_CBW_LUN_MASK   0x0f
	Valid bits in bCBWLUN.
#define	USB_CBW_LEN_MASK   0x1f
	Valid bits in bCBWCBLength.
#define	USB_CSW_SIGNATURE   0x53425355
	dCSWSignature value
#define	USB_CSW_STATUS_PASS   0x00
	Command Passed.
#define	USB_CSW_STATUS_FAIL   0x01
	Command Failed.
#define	USB_CSW_STATUS_PE   0x02
	Phase Error.
Enumerations
enum	usb_msc_interface_subclass {   USB_MSC_SUBCLASS_RBC = 0x01, USB_MSC_SUBCLASS_ATAPI = 0x02, USB_MSC_SUBCLASS_QIC_157 = 0x03, USB_MSC_SUBCLASS_UFI = 0x04,   USB_MSC_SUBCLASS_SFF_8070I = 0x05, USB_MSC_SUBCLASS_TRANSPARENT = 0x06 }
	Possible bInterfaceSubClass values for a mass-storage interface. More...
enum	usb_msc_interface_protocol { USB_MSC_PROTOCOL_CBI = 0x00, USB_MSC_PROTOCOL_CBI_ALT = 0x01, USB_MSC_PROTOCOL_BULK = 0x50 }
	Possible bInterfaceProtocol values for a mass-storage interface. More...
enum	usb_msc_reqid { USB_MSC_REQ_BULK_RESET = 0xff, USB_MSC_REQ_GET_MAX_LUN = 0xfe }
	Mass Storage Bulk-only class specific requests. More...

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Detailed Description

This module contains definitions and data structures taken from the USB Mass Storage Class Specification Overview 1.2 and the USB Mass Storage Class Bulk-Only Transport 1.0 specifications.

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Define Documentation

#define USB_CBW_DIRECTION_IN   (1 << 7)

Data from device to host.

Definition at line 109 of file msc_protocol.h.

Referenced by msc_do_read().

#define USB_CBW_LEN_MASK   0x1f

Valid bits in bCBWCBLength.

Definition at line 111 of file msc_protocol.h.

#define USB_CBW_LUN_MASK   0x0f

Valid bits in bCBWLUN.

Definition at line 110 of file msc_protocol.h.

#define USB_CBW_SIGNATURE   0x43425355

dCBWSignature value

Definition at line 108 of file msc_protocol.h.

#define USB_CSW_SIGNATURE   0x53425355

dCSWSignature value

Definition at line 123 of file msc_protocol.h.

#define USB_CSW_STATUS_FAIL   0x01

Command Failed.

Definition at line 125 of file msc_protocol.h.

Referenced by msc_do_read().

#define USB_CSW_STATUS_PASS   0x00

Command Passed.

Definition at line 124 of file msc_protocol.h.

Referenced by msc_do_read().

#define USB_CSW_STATUS_PE   0x02

Phase Error.

Definition at line 126 of file msc_protocol.h.

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Enumeration Type Documentation

enum usb_msc_interface_protocol

Possible bInterfaceProtocol values for a mass-storage interface.

Note:

The CBI protocols should not be used in new designs.

Enumerator:

USB_MSC_PROTOCOL_CBI	Command/Bulk/Interrupt.
USB_MSC_PROTOCOL_CBI_ALT	W/o command completion.
USB_MSC_PROTOCOL_BULK	Bulk-only.

Definition at line 79 of file msc_protocol.h.

enum usb_msc_interface_subclass

Possible bInterfaceSubClass values for a mass-storage interface.

Note:

In practice, most devices should use USB_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.

Enumerator:

USB_MSC_SUBCLASS_RBC	Reduced Block Commands.
USB_MSC_SUBCLASS_ATAPI	CD/DVD devices.
USB_MSC_SUBCLASS_QIC_157	Tape devices.
USB_MSC_SUBCLASS_UFI	Floppy disk drives.
USB_MSC_SUBCLASS_SFF_8070I	Floppy disk drives.
USB_MSC_SUBCLASS_TRANSPARENT	Determined by INQUIRY.

Definition at line 64 of file msc_protocol.h.

enum usb_msc_reqid

Mass Storage Bulk-only class specific requests.

Enumerator:

USB_MSC_REQ_BULK_RESET	Mass Storage Reset.
USB_MSC_REQ_GET_MAX_LUN	Get Max LUN.

Definition at line 88 of file msc_protocol.h.