1/* SPDX-License-Identifier: GPL-2.0+ */
2/*
3 * Driver for USB Mass Storage compliant devices
4 * Debugging Functions Header File
5 *
6 * Current development and maintenance by:
7 * (c) 1999-2002 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
8 *
9 * Initial work by:
10 * (c) 1999 Michael Gee (michael@linuxspecific.com)
11 *
12 * This driver is based on the 'USB Mass Storage Class' document. This
13 * describes in detail the protocol used to communicate with such
14 * devices. Clearly, the designers had SCSI and ATAPI commands in
15 * mind when they created this document. The commands are all very
16 * similar to commands in the SCSI-II and ATAPI specifications.
17 *
18 * It is important to note that in a number of cases this class
19 * exhibits class-specific exemptions from the USB specification.
20 * Notably the usage of NAK, STALL and ACK differs from the norm, in
21 * that they are used to communicate wait, failed and OK on commands.
22 *
23 * Also, for certain devices, the interrupt endpoint is used to convey
24 * status of a command.
25 */
26
27#ifndef _DEBUG_H_
28#define _DEBUG_H_
29
30#include <linux/kernel.h>
31
32#ifdef CONFIG_USB_STORAGE_DEBUG
33void usb_stor_show_command(const struct us_data *us, struct scsi_cmnd *srb);
34void usb_stor_show_sense(const struct us_data *us, unsigned char key,
35 unsigned char asc, unsigned char ascq);
36__printf(2, 3) void usb_stor_dbg(const struct us_data *us,
37 const char *fmt, ...);
38
39#define US_DEBUG(x) x
40#else
41__printf(2, 3)
42static inline void _usb_stor_dbg(const struct us_data *us,
43 const char *fmt, ...)
44{
45}
46#define usb_stor_dbg(us, fmt, ...) \
47 do { if (0) _usb_stor_dbg(us, fmt, ##__VA_ARGS__); } while (0)
48#define US_DEBUG(x)
49#endif
50
51#endif
52