Linux驱动设置硬件引脚中断

/* 中断IO描述结构体 */
struct irq_keydesc {
	int gpio;								/* gpio */
	int irqnum;								/* 中断号     */
	unsigned char value;					/* 按键对应的键值 */
	char name[10];							/* 名字 */
	irqreturn_t (*handler)(int, void *);	/* 中断服务函数 */
};

struct irq_keydesc  irqkeydesc;
#define KEY0VALUE   0X01

static irqreturn_t key0_handler(int irq, void *dev_id)
{
	struct imx6uirq_dev * dev = (struct imx6uirq_dev *)dev_id;
	return IRQ_RETVAL(IRQ_HANDLED);
}

void init()
{
    irqkeydesc.gpio = of_get_named_gpio(device_node, "key-gpio", 0);    // 如果是gpio0_io18  gpio的结果就是18
    irqkeydesc.name = "KEY0";
    gpio_request(imx6uirq.gpio, irqkeydesc.name);
    gpio_direction_input(irqkeydesc.gpio);	
	irqkeydesc.irqnum = irq_of_parse_and_map(device_node, 0);           // 获取中断号

    irqkeydesc.handler = key0_handler;
	irqkeydesc.value = KEY0VALUE;
	

    request_irq(irqkeydesc.irqnum, irqkeydesc.handler, IRQF_TRIGGER_FALLING|IRQF_TRIGGER_RISING, irqkeydesc.name, &imx6uirq);
}