simpleled.c

本程序可实现led点阵驱动

/*
 * Copyright (C) 2004 Gexin TECH 
 *                     <[e-mail]>
 *
	 This file just for GX-ARM9-2410EP  

   Sat Feb 7 2004 Zhen-feng Zhao <[e-mail]>
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 */

#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/interrupt.h>	/* for in_interrupt */
#include <linux/timer.h>
#include <linux/init.h>
#include <linux/delay.h>	/* for udelay */
#include <linux/modversions.h>
#include <linux/version.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/hardware.h>



#define SimpleLED_MAJOR	97


devfs_handle_t  dev_handle;     /* register handle to store device fs */
int SimpleLED_temp_count=0;
static long ioremap_addr;

ssize_t SimpleLED_read (struct file * file ,char * buf, size_t count, loff_t * f_ops)
{

	printk("s3c2410: device file-read operation!\n");	

	return count;
}	

/*=========== SimpleD  Write =======================*/
ssize_t SimpleLED_write (struct file * file ,const char * buf, size_t count, loff_t * f_ops)
{

	//printk("s3c2410: device file-write operation!\n");	
	outw(count,ioremap_addr);	
	return count;
}	



/*=========== SimpleD Ioctl =======================*/
ssize_t SimpleLED_ioctl (struct inode * inode ,struct file * file,
	       	   unsigned int cmd, long data)
{
	printk("s3c2410: device ioctl operation!\n");	
	
}

/*============ SimpleD device open ==============*/ 
ssize_t SimpleLED_open (struct inode * inode ,struct file * file)
{
	return 0;
}	

/*============ SimpleD device close =============*/
ssize_t SimpleLED_release (struct inode  * inode ,struct file * file)
{
	outw(0x0000,ioremap_addr);
	return 0;
}

struct file_operations SimpleLED_ops ={
	
	open:		SimpleLED_open,
	
	read:		SimpleLED_read,
	
	write:		SimpleLED_write,
	
	ioctl:		SimpleLED_ioctl,
	
	release:	SimpleLED_release,
};


static int __init HW_SimpleLED_init(void)
{
    int ret = -ENODEV;
    int delay ;
	
	ret = devfs_register_chrdev(SimpleLED_MAJOR, "SimpleLED", &SimpleLED_ops);  		

	if( ret < 0 ){
		printk (" s3c2410: init_module failed with %d\n", ret);	
		return ret;
	}
	else
		{
		printk(KERN_INFO" S3c2410 SimpleLED register success!!!\n");
		;
		}

	dev_handle = devfs_register( NULL, "SimpleLED", DEVFS_FL_DEFAULT,
                        SimpleLED_MAJOR, 0, S_IFCHR, &SimpleLED_ops, NULL);

	ioremap_addr=ioremap(0x20000000,0x0f);
	
	outw(0x55aa,ioremap_addr);
	printk("remap address = %x\n",ioremap_addr);
	//!!!!!!!!!!!!!!
     

    return ret;
}


int __init s3c2410_SimpleLED_init(void) {
    int  ret = -ENODEV;

    ret = HW_SimpleLED_init();
    if (ret)
      return ret;
    return 0;
}
int init_module()
{
	s3c2410_SimpleLED_init();
}
void cleanup_module()
{
        devfs_unregister_chrdev( SimpleLED_MAJOR, "SimpleLED" );
        devfs_unregister( dev_handle );
}