内核模块编程之进阶（四）-编写带参数的中断模块

#include <linux/module.h>
#include <linux/init.h> 
#include <linux/interrupt.h>

static int irq; 
static char *interface; 
//MODULE_PARM_DESC(interface,"A network interface"); 2.4内核中该宏的用法 
//molule_parm(interface,charp,0644) ;
//2.6内核中的宏 
//MODULE_PARM_DESC(irq,"The IRQ of the network interface"); 
module_param(irq,int,0644); 
static irqreturn_t myinterrupt(int irq, void *dev_id, struct pt_regs *regs) { 
    static int mycount = 0;
    if (mycount < 10) { 
        printk("Interrupt!\n");
        mycount++; 
    } 
    return IRQ_NONE; 
} 
static int __init myirqtest_init(void) { 
    printk ("My module worked!11111\n"); 
    if (request_irq(irq, &myinterrupt, SA_SHIRQ,interface, &irq)) { 
        printk(KERN_ERR "myirqtest: cannot register IRQ %d\n", irq);
        return -EIO;
    } 
    printk("%s Request on IRQ %d succeeded\n",interface,irq); 
    return 0;
} 
static void __exit myirqtest_exit(void) { 
    printk ("Unloading my module.\n"); 
    free_irq(irq, &irq); 
    printk("Freeing IRQ %d\n", irq);
    return; 
} 

module_init(myirqtest_init); 
module_exit(myirqtest_exit); 
MODULE_LICENSE("GPL");