一、驱动程序
#ifdef MODULE
#include <linux/module.h>
#include <linux/version.h>
#else
#define MOD_INC_USE_COUNT
#define MOD_DEC_USE_COUNT
#endif
//#define __KERNEL__
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/fs.h>
//#include <linux/poll.h>
//#include <linux/slab.h>
#include <linux/ioport.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/irq.h> //including irq number
#include <S3C2410.h>
//#define INT_EXTINT1 1
//#define INT_EXTINT0 0
static void xint1_interrupt(int irq, void *id, struct pt_regs *regs);
static int hpi_open(struct inode *,struct file *);
static int hpi_release(struct inode *,struct file *);
static int hpi_read(struct file*,char*,int,loff_t*);
static int hpi_ioctl(struct inode* s_node,struct file* s_file,unsigned int cmd,unsigned long arg);
/*driver's file operations*/
struct file_operations xint3_fops=
{
read
void(*)) hpi_read,
ioctl
void(*)) hpi_ioctl,
open
void(*)) hpi_open,
release
void(*)) hpi_release,
};
static int inter3_num=0; //计算xinter3发生中断的次数
static int major=245;//;
char hpi_name[]="hpidrv";
//xint3中断服务程序
static void xint3_interrupt(int irq, void *id, struct pt_regs *regs)
{
printk("<1>xint3 interrupt program entered %d times\n",inter0_num);
printk("<1>interrupt3 out!\n");
disable_irq(IRQ_EINT3);
INTPND|=0x08;//将intpnd第3位置1以清除中断3标支位
inter3_num+=1;
// GPFDAT=~GPFDAT;
enable_irq(IRQ_EINT3);
return;
}
/*this function be called when driver is install*/
//驱动程序的注册和注销是利用主设备号
static int __init hpi_init_module(void)
{
int retv;
retv=register_chrdev(major,hpi_name,&xint3_fops);//设备注册
if(retv<0)
{
printk("<1>Register Fail!\n");
return retv;
}
if(major==0) major=retv;
printk("<1> hpidrv device reginstered ok!\n");
return 0;
}
/*this function be called when driver is uninstall*/
static void __exit hpi_cleanup_module(void)
{
int retv;
retv=unregister_chrdev(major,hpi_name);
if(retv<0)
{
printk("<1>UnRegister Fail!\n");
return ;
}
printk("<1>HPIDRV:Good Bye!\n");
}
module_init(hpi_init_module);
module_exit(hpi_cleanup_module);
/*open and initialize it*/
//在open函数中进行驱动程序的初始化，中断也在此进行
static int hpi_open(struct inode * hpi_node,struct file * hpi_file)
{
int retv;
char *short_head;
GPFCON=(GPFCON&0xffffff3f)+0x80;
EXTINT0=(EXTINT0&0xfffff1ff);
INTMOD=(INTMOD&0xfffffff7);
INTMSK=(INTMSK&0xfffffff7);
retv=request_irq(IRQ_EINT3,xint3_interrupt,SA_SHIRQ,"hpi_xinter3",NULL);//注册中断
if(retv==-1)
{
printk("<1>Request IRQ%d error!\n",IRQ_EINT3);
return -EBUSY;
}
printk("<1>interrupt3 register ok! retv=%d\n",retv);
enable_irq(IRQ_EINT3);
printk("IRQ_EINT3=%d\n",IRQ_EINT3);
printk("GPFCON=%x\n",GPFCON);
printk("INTMSK=%x\n",INTMSK);
return 0;
}
//this will be called when the device is closed
static int hpi_release(struct inode * s_node,struct file * s_file)
{
INTMSK|=0x08;// 关中断int3
disable_irq(IRQ_EINT3);
printk("<1>interrupt3 is released ok!\n");
free_irq(IRQ_EINT3, NULL);//释放中断3
printk("<1>interrupt3 is released ok!\n");
return 0;
}
/*driver's read function*/
static int hpi_read(struct file*s_file,char *buf,int len,loff_t* loff)
{
return 0;
}
static int hpi_ioctl(struct inode* hpi_node,struct file* hpi_file,unsigned int cmd,unsigned long arg)
{
return 0;
}
/*end of extint3.c*/
应用程序
#include <stdio.h>
#include <string.h>
#include <malloc.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <signal.h>
#include <sys/ioctl.h>
int main(void)
{
int fd;
if((fd=open("/dev/hpidrv",O_RDWR))==-1) //打开设备
{
perror("open error");
exit(1);
}
printf("open hpidrv ok!\n");
sleep(10); &n bsp; &n bsp; //系统睡眠10秒钟，可用这段时间按键测试中断
printf("sleep finished !\n");
//system("more interrupts");
close(fd);
printf("file closed!\n");
return 0;
}
测试过程
# insmod extint3_drv.o
hpidrv device reginstered ok!
# mknod /dev/hpidrv c 245 0
# ./extint3_drv_user
interrupt3 register ok! retv=-22
IRQ_EINT3=3
GPFCON=55aa
INTMSK=29f79fd2
open hpidrv ok!
//在此期间我给GPF3加低电平，没有反应,后来看到request_irq（）的返回值非零，是－22，然后我就此试了很多其他的驱动，可是每次都无法申请到中断，自认为底层寄存器的设置都正确，困惑啊！！！
请高手指点一下！
sleep finished !
interrupt3 is released ok!
Trying to free IRQ3
Function entered at [<c0019150>] from [<c49b0328>]
r4 = C03840A0
Function entered at [<c49b02e8>] from [<c0048208>]
Function entered at [<c0048170>] from [<c0046d70>]
r7 = 00000006 r6 = C3FAF860 r5 = 00000000 r4 = C03840A0
Function entered at [<c0046cf0>] from [<c0046e08>]
r6 = 00008310 r5 = C03840A0 r4 = C3FAF860
Function entered at [<c0046d7c>] from [<c0018640>]
r5 = BFFFFE14 r4 = 00000648
interrupt3 is released ok!
file closed!
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