s3c2410中断驱动--interrupt key

//驱动程序

#include <linux/config.h>

#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/init.h>

#include <linux/sched.h>

#include <linux/irq.h>

#include <asm/hardware.h>

#include <asm/uaccess.h>

#define DEVICE_NAME "s3c2410-key-int"

#define KEYRAW_MINOR 1

static int key_int_major = 0;

static int key_down = 0;

static ssize_t key_int_write(struct file *file, const char *buffer, size_t count, loff_t * ppos)

{ int len=sizeof(key_down);

if(count<len) len=count;

copy_from_user(&key_down,buffer,len);

return len;}

static ssize_t key_int_read(struct file *filp, char *buffer, size_t count, loff_t *ppos)

{ copy_to_user(buffer, (char *)&key_down, sizeof(key_down));

key_down=0;

return sizeof(key_down);}

int key_int_open(struct inode *inode,struct file *filp)

{ printk("open ok\n");

return 0;

}

int key_int_release(struct inode *inode,struct file *filp)

{ printk("release ok\n"); return 0;}

static struct file_operations key_int_fops={

open: key_int_open,

release: key_int_release,

read:key_int_read,

write:key_int_write,

};

//中断处理程序

void test_interrupt(int irq,void *dev_id,struct pt_regs *regs)

{

printk("key down!^-^\n");

key_down=1;

printk("%d\n",key_down);

}

devfs_handle_t devfs_keyintraw;

int __init key_int_init(void)

{ static int result;

set_external_irq(IRQ_EINT5,EXT_FALLING_EDGE, GPIO_PULLUP_EN);

result=request_irq(IRQ_EINT5, test_interrupt, 0, DEVICE_NAME,0);

if(result)

{printk("Can't get assigned irq %d, result=%d\n",IRQ_EINT5,result);}

devfs_keyintraw = devfs_register(NULL, DEVICE_NAME,

DEVFS_FL_DEFAULT, key_int_major,0

, S_IFCHR|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP, &key_int_fops,NULL);

return 0;

}

void __exit key_int_exit(void)

{

devfs_unregister(devfs_keyintraw);

free_irq(IRQ_EINT5,NULL);

}

module_init(key_int_init);

module_exit(key_int_exit);

MODULE_LICENSE("GPL");

//驱动测试程序

#include <stdio.h>

#include <sys/ioctl.h>

#include <sys/stat.h>

#include <fcntl.h>

#define DEVICE_INTTEST "/dev/s3c2410-key-int"

int main()

{ int fd, key;

if((fd=open(DEVICE_INTTEST,O_RDONLY|O_NONBLOCK))<0)

{ perror("can not open device");

exit(1);
}

while(1)

{ read(fd,&key,sizeof(key));

if(key==1) printf("key pressed\n");
}

}