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 33 void usb_stor_show_command(const struct us_data *us, struct scsi_cmnd *srb); 34 void 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) 42 static 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