1. 根目录:
2. drivers
3. usb
4. storage
5. debug.h

/* Driver for USB Mass Storage compliant devices
 * Debugging Functions Header File
 *
 * Current development and maintenance by:
 *   (c) 1999-2002 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
 *
 * Initial work by:
 *   (c) 1999 Michael Gee (michael@linuxspecific.com)
 *
 * This driver is based on the 'USB Mass Storage Class' document. This
 * describes in detail the protocol used to communicate with such
 * devices.  Clearly, the designers had SCSI and ATAPI commands in
 * mind when they created this document.  The commands are all very
 * similar to commands in the SCSI-II and ATAPI specifications.
 *
 * It is important to note that in a number of cases this class
 * exhibits class-specific exemptions from the USB specification.
 * Notably the usage of NAK, STALL and ACK differs from the norm, in
 * that they are used to communicate wait, failed and OK on commands.
 *
 * Also, for certain devices, the interrupt endpoint is used to convey
 * status of a command.
 *
 * Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more
 * information about this driver.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#ifndef _DEBUG_H_
#define _DEBUG_H_

#include <linux/kernel.h>

#define USB_STORAGE "usb-storage: "

#ifdef CONFIG_USB_STORAGE_DEBUG
void usb_stor_show_command(const struct us_data *us, struct scsi_cmnd *srb);
void usb_stor_show_sense(const struct us_data *us, unsigned char key,
			 unsigned char asc, unsigned char ascq);
__printf(2, 3) int usb_stor_dbg(const struct us_data *us,
				const char *fmt, ...);

#define US_DEBUGPX(fmt, ...)	printk(fmt, ##__VA_ARGS__)
#define US_DEBUG(x)		x
#else
__printf(2, 3)
static inline int _usb_stor_dbg(const struct us_data *us,
				const char *fmt, ...) {return 1;}
#define usb_stor_dbg(us, fmt, ...)				\
	do { if (0) _usb_stor_dbg(us, fmt, ##__VA_ARGS__); } while (0)
#define US_DEBUGPX(fmt, ...)					\
	do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
#define US_DEBUG(x)
#endif

#endif