//-------------------------------------------------------------------
//	ide_lock.c
//
//	This module's 'get_info()' function shows how to lock and
//	unlock the global 'ide_lock' kernel variable, in order to
//	synchronize accesses to the IDE Hard Disk Controller [see
//	Linux Device Drivers (3rd Edition), Chapter 5].
//	
//	NOTE: Written and tested with Linux kernel version 2.6.10
//
//	programmer: ALLAN CRUSE
//	written on: 12 MAR 2005
//-------------------------------------------------------------------

#include <linux/module.h>	// for init_module() 
#include <linux/proc_fs.h>	// for create_proc_info_entry() 

extern spinlock_t ide_lock;	// global variable in the kernel
char modname[] = "ide_lock";	// used to create '/proc' entry


int my_get_info( char *buf, char **start, off_t off, int count )
{
	int	len;

	len = 0;
	len += sprintf( buf+len, "ide_lock=%lu\n", ide_lock.lock );
	spin_lock( &ide_lock );
	len += sprintf( buf+len, "ide_lock=%lu\n", ide_lock.lock );
	spin_unlock( &ide_lock );
	len += sprintf( buf+len, "ide_lock=%lu\n", ide_lock.lock );
	return	len;
}


int init_module( void )
{
	printk( "<1>\nInstalling \'%s\' module\n", modname );
	create_proc_info_entry( modname, 0, NULL, my_get_info );
	return	0;  //SUCCESS
}


void cleanup_module( void )
{
	remove_proc_entry( modname, NULL );
	printk( "<1>Removing \'%s\' module\n", modname );
}

MODULE_LICENSE("GPL");