1/* Driver for USB Mass Storage compliant devices
2 * Transport 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 _TRANSPORT_H_
40#define _TRANSPORT_H_
41
42#include <linux/blkdev.h>
43
44/*
45 * usb_stor_bulk_transfer_xxx() return codes, in order of severity
46 */
47
48#define USB_STOR_XFER_GOOD	0	/* good transfer                 */
49#define USB_STOR_XFER_SHORT	1	/* transferred less than expected */
50#define USB_STOR_XFER_STALLED	2	/* endpoint stalled              */
51#define USB_STOR_XFER_LONG	3	/* device tried to send too much */
52#define USB_STOR_XFER_ERROR	4	/* transfer died in the middle   */
53
54/*
55 * Transport return codes
56 */
57
58#define USB_STOR_TRANSPORT_GOOD	   0   /* Transport good, command good	   */
59#define USB_STOR_TRANSPORT_FAILED  1   /* Transport good, command failed   */
60#define USB_STOR_TRANSPORT_NO_SENSE 2  /* Command failed, no auto-sense    */
61#define USB_STOR_TRANSPORT_ERROR   3   /* Transport bad (i.e. device dead) */
62
63/*
64 * We used to have USB_STOR_XFER_ABORTED and USB_STOR_TRANSPORT_ABORTED
65 * return codes.  But now the transport and low-level transfer routines
66 * treat an abort as just another error (-ENOENT for a cancelled URB).
67 * It is up to the invoke_transport() function to test for aborts and
68 * distinguish them from genuine communication errors.
69 */
70
71/*
72 * CBI accept device specific command
73 */
74
75#define US_CBI_ADSC		0
76
77extern int usb_stor_CB_transport(struct scsi_cmnd *, struct us_data*);
78extern int usb_stor_CB_reset(struct us_data*);
79
80extern int usb_stor_Bulk_transport(struct scsi_cmnd *, struct us_data*);
81extern int usb_stor_Bulk_max_lun(struct us_data*);
82extern int usb_stor_Bulk_reset(struct us_data*);
83
84extern void usb_stor_invoke_transport(struct scsi_cmnd *, struct us_data*);
85extern void usb_stor_stop_transport(struct us_data*);
86
87extern int usb_stor_control_msg(struct us_data *us, unsigned int pipe,
88		u8 request, u8 requesttype, u16 value, u16 index,
89		void *data, u16 size, int timeout);
90extern int usb_stor_clear_halt(struct us_data *us, unsigned int pipe);
91
92extern int usb_stor_ctrl_transfer(struct us_data *us, unsigned int pipe,
93		u8 request, u8 requesttype, u16 value, u16 index,
94		void *data, u16 size);
95extern int usb_stor_bulk_transfer_buf(struct us_data *us, unsigned int pipe,
96		void *buf, unsigned int length, unsigned int *act_len);
97extern int usb_stor_bulk_transfer_sg(struct us_data *us, unsigned int pipe,
98		void *buf, unsigned int length, int use_sg, int *residual);
99extern int usb_stor_bulk_srb(struct us_data* us, unsigned int pipe,
100		struct scsi_cmnd* srb);
101
102extern int usb_stor_port_reset(struct us_data *us);
103#endif
104