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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Driver for USB Mass Storage compliant devices
4 * Protocol Functions Header File
5 *
6 * Current development and maintenance by:
7 * (c) 1999, 2000 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
8 *
9 * This driver is based on the 'USB Mass Storage Class' document. This
10 * describes in detail the protocol used to communicate with such
11 * devices. Clearly, the designers had SCSI and ATAPI commands in
12 * mind when they created this document. The commands are all very
13 * similar to commands in the SCSI-II and ATAPI specifications.
14 *
15 * It is important to note that in a number of cases this class
16 * exhibits class-specific exemptions from the USB specification.
17 * Notably the usage of NAK, STALL and ACK differs from the norm, in
18 * that they are used to communicate wait, failed and OK on commands.
19 *
20 * Also, for certain devices, the interrupt endpoint is used to convey
21 * status of a command.
22 *
23 * Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more
24 * information about this driver.
25 */
26
27#ifndef _PROTOCOL_H_
28#define _PROTOCOL_H_
29
30/* Protocol handling routines */
31extern void usb_stor_pad12_command(struct scsi_cmnd*, struct us_data*);
32extern void usb_stor_ufi_command(struct scsi_cmnd*, struct us_data*);
33extern void usb_stor_transparent_scsi_command(struct scsi_cmnd*,
34 struct us_data*);
35
36/* struct scsi_cmnd transfer buffer access utilities */
37enum xfer_buf_dir {TO_XFER_BUF, FROM_XFER_BUF};
38
39extern unsigned int usb_stor_access_xfer_buf(unsigned char *buffer,
40 unsigned int buflen, struct scsi_cmnd *srb, struct scatterlist **,
41 unsigned int *offset, enum xfer_buf_dir dir);
42
43extern void usb_stor_set_xfer_buf(unsigned char *buffer,
44 unsigned int buflen, struct scsi_cmnd *srb);
45#endif