中斷例子

usage: Compiling this file by make 
and using the following command to insert the mode which the make generated just now
command: sudo insmod filename.ko irq=1 devname=myirq
This interrupt shared the one irq with keyboard
*/

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <plat/gpio.h>
#include <asm-generic/gpio.h>


static int irq = 64 + 96;
static char *devname = "mydev";
static int value;
static irqreturn_t myirq_handler(int irq,void* dev)
{
value = gpio_get_value(64);
printk("vlaue = %d\n", value);
printk("hello word!!\n");
return IRQ_HANDLED;
}


static int __init myirq_init(void)
{
printk("Module is working..\n");
value = gpio_get_value(64);
printk("vlaue = %d\n", value);
if(request_irq(irq,myirq_handler,IRQF_DISABLED,devname,(void*)devname)!=0)
{
printk("request IRQ:failed..\n");
return -1;
}
return 0;
}


static void __exit myirq_exit(void)
{

printk("Module is leaving..\n");
free_irq(irq,NULL);
}


module_init(myirq_init);
module_exit(myirq_exit);
MODULE_LICENSE("GPL");