使用tasklet处理中断事例

#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/sched.h>
#include <linux/irq.h>
#include <asm/io.h>

#define INTRNO 7

static void tasklet_callback(unsigned long data)
{
        printk(KERN_ALERT "received a interrupt.\n");
}

DECLARE_TASKLET(tasklet, tasklet_callback, 0);

static irqreturn_t irq_handler(int irq, void *arg)
{
        tasklet_schedule(&tasklet);

        return IRQ_HANDLED;
}

static int __init test_init(void)
{
        int ret;

        ret = request_irq(INTRNO, irq_handler, 0, "hello", NULL);
        if (ret < 0)
                goto err;

        outb(0x10, 0x37a); /* enable parallel port interrupt */
err:
        return ret;
}

static void __exit test_exit(void)
{
        free_irq(INTRNO, NULL);
}

MODULE_LICENSE("GPL");

module_init(test_init);
module_exit(test_exit);