尝试将omap4460的一个gpio引脚用作外部中断。虽然可以申请到中断号，但总是进不了中断服务程序。配置过程如下：gpio_request(MY_IRQ_GPIO, "my_irq");
...
gpio_direction_input(MY_IRQ_GPIO);
...
irq = gpio_to_irq(MY_IRQ_GPIO);
if (irq < 0)
{
printk("request irq %d failed !\n", irq);
goto err_detect_irq_num_failed;
}
ret = request_irq(irq, my_interrupt, IRQF_TRIGGER_HIGH, client->dev.driver->name, client);
if (ret )
{
printk(KERN_ERR "request irq failed,ret is %d\n",ret);
goto err_request_irq;
}