storage.h

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#ifndef __LINUX_USB_STORAGE_H
#define __LINUX_USB_STORAGE_H

/*
 * linux/usb/storage.h
 *
 * Copyright Matthew Wilcox for Intel Corp, 2010
 *
 * This file contains definitions taken from the
 * USB Mass Storage Class Specification Overview
 *
 * Distributed under the terms of the GNU GPL, version two.
 */

/* Storage subclass codes */

#define USB_SC_RBC  0x01        /* Typically, flash devices */
#define USB_SC_8020 0x02        /* CD-ROM */
#define USB_SC_QIC  0x03        /* QIC-157 Tapes */
#define USB_SC_UFI  0x04        /* Floppy */
#define USB_SC_8070 0x05        /* Removable media */
#define USB_SC_SCSI 0x06        /* Transparent */
#define USB_SC_LOCKABLE 0x07        /* Password-protected */

#define USB_SC_ISD200   0xf0        /* ISD200 ATA */
#define USB_SC_CYP_ATACB    0xf1    /* Cypress ATACB */
#define USB_SC_DEVICE   0xff        /* Use device's value */

/* Storage protocol codes */

#define USB_PR_CBI  0x00        /* Control/Bulk/Interrupt */
#define USB_PR_CB   0x01        /* Control/Bulk w/o interrupt */
#define USB_PR_BULK 0x50        /* bulk only */
#define USB_PR_UAS  0x62        /* USB Attached SCSI */

#define USB_PR_USBAT    0x80        /* SCM-ATAPI bridge */
#define USB_PR_EUSB_SDDR09  0x81    /* SCM-SCSI bridge for SDDR-09 */
#define USB_PR_SDDR55   0x82        /* SDDR-55 (made up) */
#define USB_PR_DPCM_USB 0xf0        /* Combination CB/SDDR09 */
#define USB_PR_FREECOM  0xf1        /* Freecom */
#define USB_PR_DATAFAB  0xf2        /* Datafab chipsets */
#define USB_PR_JUMPSHOT 0xf3        /* Lexar Jumpshot */
#define USB_PR_ALAUDA   0xf4        /* Alauda chipsets */
#define USB_PR_KARMA    0xf5        /* Rio Karma */

#define USB_PR_DEVICE   0xff        /* Use device's value */

 /*
  * Bulk only data structures
  */

/* command block wrapper */
struct bulk_cb_wrap {
    __le32  Signature;      /* contains 'USBC' */
    __u32   Tag;            /* unique per command id */
    __le32  DataTransferLength; /* size of data */
    __u8    Flags;          /* direction in bit 0 */
    __u8    Lun;            /* LUN normally 0 */
    __u8    Length;         /* of of the CDB */
    __u8    CDB[16];        /* max command */
};

#define US_BULK_CB_WRAP_LEN 31
#define US_BULK_CB_SIGN     0x43425355  /*spells out USBC */
#define US_BULK_FLAG_IN     (1 << 7)
#define US_BULK_FLAG_OUT    0

/* command status wrapper */
struct bulk_cs_wrap {
    __le32  Signature;  /* should = 'USBS' */
    __u32   Tag;        /* same as original command */
    __le32  Residue;    /* amount not transferred */
    __u8    Status;     /* see below */
};

#define US_BULK_CS_WRAP_LEN 13
#define US_BULK_CS_SIGN     0x53425355      /* spells out 'USBS' */
#define US_BULK_STAT_OK     0
#define US_BULK_STAT_FAIL   1
#define US_BULK_STAT_PHASE  2

/* bulk-only class specific requests */
#define US_BULK_RESET_REQUEST   0xff
#define US_BULK_GET_MAX_LUN     0xfe

#endif