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added BUG_ON for older 2.4 kernels

#ifndef __CRAP_H
#define __CRAP_H

/**
 *  compatibility crap for old kernels. No guarantee for a working driver
 *  even when everything compiles.
 */


#include <linux/module.h>
#include <linux/list.h>
#include <linux/videodev.h>


#ifndef MODULE_LICENSE
#define MODULE_LICENSE(x)
#endif


#ifndef list_for_each_safe
#define list_for_each_safe(pos, n, head) \
        for (pos = (head)->next, n = pos->next; pos != (head); \
                pos = n, n = pos->next)
#endif


#ifndef __devexit_p
#if defined(MODULE)
#define __devexit_p(x) x
#else
#define __devexit_p(x) NULL
#endif
#endif


#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)) || !CONFIG_VIDEO_DEV
#define video_usercopy generic_usercopy

extern int generic_usercopy(struct inode *inode, struct file *file,
	                    unsigned int cmd, unsigned long arg,
			    int (*func)(struct inode *inode, struct file *file,
			    unsigned int cmd, void *arg));
#endif


#ifndef minor
#define minor(dev) MINOR(dev)
#endif


#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,4,20))
static inline
void cond_resched (void)
{
	if (current->need_resched)
		schedule();
}
#endif


#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
#define video_devdata(dev) (dev->priv)
#endif

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,4,19)
extern struct page * vmalloc_to_page(void *addr);
#endif


#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)

#if defined(MODVERSIONS)
#include <linux/modversions.h>
#undef remap_page_range
#define remap_page_range(vma,from,to,size,prot) \
	_set_ver(remap_page_range)(from,to,size,prot)
#else
#define remap_page_range(vma,from,to,size,prot) \
	remap_page_range(from,to,size,prot)
#endif
#endif


#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
extern u32 crc32_le (u32 crc, unsigned char const *p, size_t len);
#else
#include <linux/crc32.h>
#endif


#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,48))
static inline 
int try_module_get(struct module *mod)
{
	if (!MOD_CAN_QUERY(mod))
		return 0;
	__MOD_INC_USE_COUNT(mod);
	return 1;
}

#define module_put(mod) __MOD_DEC_USE_COUNT(mod)
#endif


#ifndef wait_event_interruptible_timeout
#define __wait_event_interruptible_timeout(wq, condition, ret)          \
do {                                                                    \
        wait_queue_t __wait;                                            \
        init_waitqueue_entry(&__wait, current);                         \
                                                                        \
        add_wait_queue(&wq, &__wait);                                   \
        for (;;) {                                                      \
                set_current_state(TASK_INTERRUPTIBLE);                  \
                if (condition)                                          \
                        break;                                          \
                if (!signal_pending(current)) {                         \
                        ret = schedule_timeout(ret);                    \
                        if (!ret)                                       \
                                break;                                  \
                        continue;                                       \
                }                                                       \
                ret = -ERESTARTSYS;                                     \
                break;                                                  \
        }                                                               \
        current->state = TASK_RUNNING;                                  \
        remove_wait_queue(&wq, &__wait);                                \
} while (0)

#define wait_event_interruptible_timeout(wq, condition, timeout)        \
({                                                                      \
        long __ret = timeout;                                           \
        if (!(condition))                                               \
                __wait_event_interruptible_timeout(wq, condition, __ret); \
        __ret;                                                          \
})
#endif


#ifndef BUG_ON
#define BUG_ON(condition) do { if (unlikely((condition)!=0)) BUG(); } while(0)
#endif


#endif