shut_key.c

arm2440,LINUX下的普通IO驱动及应用程序

#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/devfs_fs_kernel.h>
#include <linux/miscdevice.h>
#include <linux/delay.h>
#include <asm/irq.h>
#include <asm/arch/regs-gpio.h>
#include <asm/hardware.h>
#include "shut_key.h"


#define DEVICE_NAME   "shut_key"
#define SHUT_KEY_MAJOR   230

MODULE_LICENSE("GPL");



static int shut_key_ioctl(struct inode *inode,struct file *file,unsigned int cmd,unsigned int arg)
{
	if(_IOC_TYPE(cmd) != GPIO_IOF_MAGIC)
	{
		return -ENOTTY;	
	}
	if(_IOC_NR(cmd) >= GPIO_MAXNR)
	{
		return -ENOTTY;	
	}
	switch(cmd)
	{
		case GPIO_SET_PINF3:
		    s3c2410_gpio_setpin(S3C2410_GPF3,arg);
		    break;
		case GPIO_SET_PINF4:           			
		    s3c2410_gpio_setpin(S3C2410_GPF4,arg);
		    break;
		case GPIO_SET_PINF5:             			
		    s3c2410_gpio_setpin(S3C2410_GPF5,arg);
		    break;
		case GPIO_SET_PINF6:              			
		    s3c2410_gpio_setpin(S3C2410_GPF6,arg);
		    break;
		case GPIO_SET_PINB7:
		    s3c2410_gpio_setpin(S3C2410_GPB7,arg);
		    break;
		case GPIO_SET_PINB8:
		    s3c2410_gpio_setpin(S3C2410_GPB8,arg);
		    break;
		case GPIO_SET_PINB9:
		    s3c2410_gpio_setpin(S3C2410_GPB9,arg);
		    break;
		case GPIO_SET_PINB10:
		    s3c2410_gpio_setpin(S3C2410_GPB10,arg);
		    break;
		
		default:
	            break;
		/*case GPIO_CLR_FPIN:
		s3c2410_gpio_setpin(S3C2410_GPF5,arg);
		break;
		case GPIO_CLR_SPIN:
		s3c2410_gpio_setpin(S3C2410_GPF6,arg);		
		break;*/

	}
	return 0;
}

static struct file_operations shut_key_fops={//文件操作
	.owner=THIS_MODULE,
	.ioctl=shut_key_ioctl,
};

static int __init shut_key_init(void)
{
	int ret;
        s3c2410_gpio_cfgpin(S3C2410_GPF3,S3C2410_GPF3_OUTP);
        s3c2410_gpio_cfgpin(S3C2410_GPF4,S3C2410_GPF4_OUTP);
	s3c2410_gpio_cfgpin(S3C2410_GPF5,S3C2410_GPF5_OUTP);
	s3c2410_gpio_cfgpin(S3C2410_GPF6,S3C2410_GPF6_OUTP);
        s3c2410_gpio_setpin(S3C2410_GPF3,0);
	s3c2410_gpio_setpin(S3C2410_GPF4,0);
	s3c2410_gpio_setpin(S3C2410_GPF5,0);
	s3c2410_gpio_setpin(S3C2410_GPF6,0);
	s3c2410_gpio_cfgpin(S3C2410_GPB7,S3C2410_GPB7_OUTP);
	s3c2410_gpio_cfgpin(S3C2410_GPB8,S3C2410_GPB8_OUTP);
	s3c2410_gpio_cfgpin(S3C2410_GPB9,S3C2410_GPB9_OUTP);
	s3c2410_gpio_cfgpin(S3C2410_GPB10,S3C2410_GPB10_OUTP);
	s3c2410_gpio_setpin(S3C2410_GPB7,0);
	s3c2410_gpio_setpin(S3C2410_GPB8,0);
	s3c2410_gpio_setpin(S3C2410_GPB9,0);
	s3c2410_gpio_setpin(S3C2410_GPB10,0);

	ret=register_chrdev(SHUT_KEY_MAJOR,DEVICE_NAME,&shut_key_fops);
	if(ret < 0)
	{
		printk(DEVICE_NAME "can't register major number\n");
		return ret;
	}
	devfs_mk_cdev(MKDEV(SHUT_KEY_MAJOR,0),S_IFCHR|S_IRUSR|S_IWUSR|S_IRGRP,DEVICE_NAME);

	printk(DEVICE_NAME "initialized\n");
	return 0;
}

static void __exit shut_key_exit(void)
{
	devfs_remove(DEVICE_NAME);
	unregister_chrdev(SHUT_KEY_MAJOR,DEVICE_NAME);

}

module_init(shut_key_init);
module_exit(shut_key_exit);