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#include <linux/interrupt.h>
…
//定义与绑定tasklet函数
void test_tasklet_action(unsigned long t);
DECLARE_TASKLET(test_tasklet, test_tasklet_action, 0);
void test_tasklet_action(unsigned long t)
{
printk("tasklet is executing\n");
}
…
ssize_t globalvar_write(struct file *filp, const char *buf, size_t len, loff_t *off)
{
…
if (copy_from_user(&global_var, buf, sizeof(int)))
{
return - EFAULT;
}
//调度tasklet执行
tasklet_schedule(&test_tasklet);
return sizeof(int);
} |
由于中断与真实的硬件息息相关，脱离硬件而空谈中断是毫无意义的，我们还是来举一个简单的例子。这个例子来源于SAMSUNG S3C2410嵌入式系统实例，看看其中实时钟的驱动中与中断相关的部分：
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static struct fasync_struct *rtc_async_queue;
static int __init rtc_init(void)
{
misc_register(&rtc_dev);
create_proc_read_entry("driver/rtc", 0, 0, rtc_read_proc, NULL);
#if RTC_IRQ
if (rtc_has_irq == 0)
goto no_irq2;
init_timer(&rtc_irq_timer);
rtc_irq_timer.function = rtc_dropped_irq;
spin_lock_irq(&rtc_lock);
/* Initialize periodic freq. to CMOS reset default, which is 1024Hz */
CMOS_WRITE(((CMOS_READ(RTC_FREQ_SELECT) &0xF0) | 0x06), RTC_FREQ_SELECT);
spin_unlock_irq(&rtc_lock);
rtc_freq = 1024;
no_irq2:
#endif
printk(KERN_INFO "Real Time Clock Driver v" RTC_VERSION "\n");
return 0;
}
static void __exit rtc_exit(void)
{
remove_proc_entry("driver/rtc", NULL);
misc_deregister(&rtc_dev);
release_region(RTC_PORT(0), RTC_IO_EXTENT);
if (rtc_has_irq)
free_irq(RTC_IRQ, NULL);
}
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