linux/drivers/isdn/hisax/hisax_debug.h

/*
 * Common debugging macros for use with the hisax driver
 *
 * Author       Frode Isaksen
 * Copyright    2001 by Frode Isaksen      <fisaksen@bewan.com>
 *              2001 by Kai Germaschewski  <kai.germaschewski@gmx.de>
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 *
 * How to use:
 *
 * Before including this file, you need to
 *   #define __debug_variable my_debug
 * where my_debug is a variable in your code which
 * determines the debug bitmask.
 *
 * If CONFIG_HISAX_DEBUG is not set, all macros evaluate to nothing
 *
 */

#ifndef __HISAX_DEBUG_H__
#define __HISAX_DEBUG_H__


#ifdef CONFIG_HISAX_DEBUG

#define DBG(level, format, arg...) do {					\
		if (level & __debug_variable)				\
			printk(KERN_DEBUG "%s: " format "\n" , __func__ , ## arg); \
	} while (0)

#define DBG_PACKET(level, data, count)					\
	if (level & __debug_variable) dump_packet(__func__, data, count)

#define DBG_SKB(level, skb)						\
	if ((level & __debug_variable) && skb) dump_packet(__func__, skb->data, skb->len)


static void __attribute__((unused))
dump_packet(const char *name, const u_char *data, int pkt_len)
{
#define DUMP_HDR_SIZE 20
#define DUMP_TLR_SIZE 8
	if (pkt_len) {
		int i, len1, len2;

		printk(KERN_DEBUG "%s: length=%d,data=", name, pkt_len);

		if (pkt_len > DUMP_HDR_SIZE + DUMP_TLR_SIZE) {
			len1 = DUMP_HDR_SIZE;
			len2 = DUMP_TLR_SIZE;
		} else {
			len1 = pkt_len > DUMP_HDR_SIZE ? DUMP_HDR_SIZE : pkt_len;
			len2 = 0;
		}
		for (i = 0; i < len1; ++i) {
			printk("%.2x", data[i]);
		}
		if (len2) {
			printk("..");
			for (i = pkt_len-DUMP_TLR_SIZE; i < pkt_len; ++i) {
				printk("%.2x", data[i]);
			}
		}
		printk("\n");
	}
#undef DUMP_HDR_SIZE
#undef DUMP_TLR_SIZE
}

#else

#define DBG(level, format, arg...) do {} while (0)
#define DBG_PACKET(level, data, count) do {} while (0)
#define DBG_SKB(level, skb) do {} while (0)

#endif

#endif