simpled.c

嵌入式测试程序！进行简单驱动程序编写！基于革新嵌入式平台！

/*
 * 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 SimpleD_MAJOR	96


devfs_handle_t  dev_handle;     /* register handle to store device fs */
int SimpleD_temp_count=0;


ssize_t SimpleD_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 SimpleD_write (struct file * file ,const char * buf, size_t count, loff_t * f_ops)
{

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



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

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

/*============ SimpleD device close =============*/
ssize_t SimpleD_release (struct inode  * inode ,struct file * file)
{
        devfs_unregister_chrdev( SimpleD_MAJOR, "SimpleD" );
        devfs_unregister( dev_handle );

	return 0;
}

struct file_operations SimpleD_ops ={
	
	open:		SimpleD_open,
	
	read:		SimpleD_read,
	
	write:		SimpleD_write,
	
	ioctl:		SimpleD_ioctl,
	
	release:	SimpleD_release,
};


static int __init HW_SimpleD_init(void)
{
    int ret = -ENODEV;
    int delay ;
	
	ret = devfs_register_chrdev(SimpleD_MAJOR, "SimpleD", &SimpleD_ops);  		

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

	dev_handle = devfs_register( NULL, "SimpleD", DEVFS_FL_DEFAULT,
                        96, 0, S_IFCHR, &SimpleD_ops, NULL);

	//!!!!!!!!!!!!!!
     

    return ret;
}


int __init s3c2410_SimpleD_init(void) {
    int  ret = -ENODEV;

    ret = HW_SimpleD_init();
    if (ret)
      return ret;
    return 0;
}
int init_module()
{
	s3c2410_SimpleD_init();
}
void cleanup_module()
{

}