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1 | /* |
2 | * Driver for USB Mass Storage compliant devices | |
1da177e4 LT |
3 | * Protocol Functions Header File |
4 | * | |
1da177e4 LT |
5 | * Current development and maintenance by: |
6 | * (c) 1999, 2000 Matthew Dharm (mdharm-usb@one-eyed-alien.net) | |
7 | * | |
8 | * This driver is based on the 'USB Mass Storage Class' document. This | |
9 | * describes in detail the protocol used to communicate with such | |
10 | * devices. Clearly, the designers had SCSI and ATAPI commands in | |
11 | * mind when they created this document. The commands are all very | |
12 | * similar to commands in the SCSI-II and ATAPI specifications. | |
13 | * | |
14 | * It is important to note that in a number of cases this class | |
15 | * exhibits class-specific exemptions from the USB specification. | |
16 | * Notably the usage of NAK, STALL and ACK differs from the norm, in | |
17 | * that they are used to communicate wait, failed and OK on commands. | |
18 | * | |
19 | * Also, for certain devices, the interrupt endpoint is used to convey | |
20 | * status of a command. | |
21 | * | |
22 | * Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more | |
23 | * information about this driver. | |
24 | * | |
25 | * This program is free software; you can redistribute it and/or modify it | |
26 | * under the terms of the GNU General Public License as published by the | |
27 | * Free Software Foundation; either version 2, or (at your option) any | |
28 | * later version. | |
29 | * | |
30 | * This program is distributed in the hope that it will be useful, but | |
31 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
32 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
33 | * General Public License for more details. | |
34 | * | |
35 | * You should have received a copy of the GNU General Public License along | |
36 | * with this program; if not, write to the Free Software Foundation, Inc., | |
37 | * 675 Mass Ave, Cambridge, MA 02139, USA. | |
38 | */ | |
39 | ||
40 | #ifndef _PROTOCOL_H_ | |
41 | #define _PROTOCOL_H_ | |
42 | ||
1da177e4 | 43 | /* Protocol handling routines */ |
3dae5345 | 44 | extern void usb_stor_pad12_command(struct scsi_cmnd*, struct us_data*); |
1da177e4 LT |
45 | extern void usb_stor_ufi_command(struct scsi_cmnd*, struct us_data*); |
46 | extern void usb_stor_transparent_scsi_command(struct scsi_cmnd*, | |
47 | struct us_data*); | |
48 | ||
49 | /* struct scsi_cmnd transfer buffer access utilities */ | |
50 | enum xfer_buf_dir {TO_XFER_BUF, FROM_XFER_BUF}; | |
51 | ||
52 | extern unsigned int usb_stor_access_xfer_buf(unsigned char *buffer, | |
1f6f31a0 | 53 | unsigned int buflen, struct scsi_cmnd *srb, struct scatterlist **, |
1da177e4 LT |
54 | unsigned int *offset, enum xfer_buf_dir dir); |
55 | ||
56 | extern void usb_stor_set_xfer_buf(unsigned char *buffer, | |
57 | unsigned int buflen, struct scsi_cmnd *srb); | |
58 | #endif |