1 /* Driver for USB Mass Storage compliant devices
2 * Protocol Functions Header File
3 *
4 * $Id: protocol.h,v 1.4 2001/02/13 07:10:03 mdharm Exp $
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 * This program is free software; you can redistribute it and/or modify it
27 * under the terms of the GNU General Public License as published by the
28 * Free Software Foundation; either version 2, or (at your option) any
29 * later version.
30 *
31 * This program is distributed in the hope that it will be useful, but
32 * WITHOUT ANY WARRANTY; without even the implied warranty of
33 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
34 * General Public License for more details.
35 *
36 * You should have received a copy of the GNU General Public License along
37 * with this program; if not, write to the Free Software Foundation, Inc.,
38 * 675 Mass Ave, Cambridge, MA 02139, USA.
39 */
40
41 #ifndef _PROTOCOL_H_
42 #define _PROTOCOL_H_
43
44 /* Protocol handling routines */
45 extern void usb_stor_ATAPI_command(struct scsi_cmnd*, struct us_data*);
46 extern void usb_stor_qic157_command(struct scsi_cmnd*, struct us_data*);
47 extern void usb_stor_ufi_command(struct scsi_cmnd*, struct us_data*);
48 extern void usb_stor_transparent_scsi_command(struct scsi_cmnd*,
49 struct us_data*);
50
51 /* struct scsi_cmnd transfer buffer access utilities */
52 enum xfer_buf_dir {TO_XFER_BUF, FROM_XFER_BUF};
53
54 extern unsigned int usb_stor_access_xfer_buf(unsigned char *buffer,
55 unsigned int buflen, struct scsi_cmnd *srb, struct scatterlist **,
56 unsigned int *offset, enum xfer_buf_dir dir);
57
58 extern void usb_stor_set_xfer_buf(unsigned char *buffer,
59 unsigned int buflen, struct scsi_cmnd *srb);
60 #endif
61
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