1 /* Driver for USB Mass Storage compliant devices
2 * Protocol Functions Header File
3 *
4 * Current development and maintenance by:
5 * (c) 1999, 2000 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
6 *
7 * This driver is based on the 'USB Mass Storage Class' document. This
8 * describes in detail the protocol used to communicate with such
9 * devices. Clearly, the designers had SCSI and ATAPI commands in
10 * mind when they created this document. The commands are all very
11 * similar to commands in the SCSI-II and ATAPI specifications.
12 *
13 * It is important to note that in a number of cases this class
14 * exhibits class-specific exemptions from the USB specification.
15 * Notably the usage of NAK, STALL and ACK differs from the norm, in
16 * that they are used to communicate wait, failed and OK on commands.
17 *
18 * Also, for certain devices, the interrupt endpoint is used to convey
19 * status of a command.
20 *
21 * Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more
22 * information about this driver.
23 *
24 * This program is free software; you can redistribute it and/or modify it
25 * under the terms of the GNU General Public License as published by the
26 * Free Software Foundation; either version 2, or (at your option) any
27 * later version.
28 *
29 * This program is distributed in the hope that it will be useful, but
30 * WITHOUT ANY WARRANTY; without even the implied warranty of
31 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
32 * General Public License for more details.
33 *
34 * You should have received a copy of the GNU General Public License along
35 * with this program; if not, write to the Free Software Foundation, Inc.,
36 * 675 Mass Ave, Cambridge, MA 02139, USA.
37 */
38
39 #ifndef _PROTOCOL_H_
40 #define _PROTOCOL_H_
41
42 /* Protocol handling routines */
43 extern void usb_stor_pad12_command(struct scsi_cmnd*, struct us_data*);
44 extern void usb_stor_ufi_command(struct scsi_cmnd*, struct us_data*);
45 extern void usb_stor_transparent_scsi_command(struct scsi_cmnd*,
46 struct us_data*);
47
48 /* struct scsi_cmnd transfer buffer access utilities */
49 enum xfer_buf_dir {TO_XFER_BUF, FROM_XFER_BUF};
50
51 extern unsigned int usb_stor_access_xfer_buf(unsigned char *buffer,
52 unsigned int buflen, struct scsi_cmnd *srb, struct scatterlist **,
53 unsigned int *offset, enum xfer_buf_dir dir);
54
55 extern void usb_stor_set_xfer_buf(unsigned char *buffer,
56 unsigned int buflen, struct scsi_cmnd *srb);
57 #endif
58
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