struct tasklet_struct
{struct tasklet_struct *next; unsigned long state;             // tasklet 状态atomic_t count;                     // 锁计数器void (*func)(unsigned long);  // tasklet 处理函数unsigned long data;               // 传递给 tasklet 处理函数的参数
};

struct key_event
{int name;int value;
};struct samsung
{int major;struct class *cls;struct device *dev;struct key_event key;struct tasklet_struct tasklet;
};static struct samsung *key_dev;void tasklet_key_irq(unsigned long data)
{printk("___^_^___ %s\n", __FUNCTION__);
}// 中断处理程序，多个按键可以根据 irqno 区分
irqreturn_t key_irq_handler(int irqno, void *dev_id)
{  int ret;  printk("------------%s-------------\n", __FUNCTION__);  ret = gpio_get_value(key_info[i].key_gpio);  ret ? (key_dev->key.value = 0) : (key_dev->key.value = 1);  printk("key = %d status = %d\n", key_dev->key.name, key_dev->key.value);  tasklet_schedule(&key_dev->tasklet);// 返回值一定要是 IRQ_HANDLED  return IRQ_HANDLED;
}  static int __init key_drv_init(void)
{  ... ...  key_dev->irqno = IRQ_EINT(2);  ret = request_irq(key_dev->irqno, key_irq_handler, IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, "key_eint", NULL);tasklet_init(&key_dev->tasklet, tasklet_key_irq, 110);... ...
}  static int __exit key_drv_exit(void)
{  ... ...  tasklet_kill(&key_dev->tasklet);free_irq(key_dev->irqno,NULL);  ... ...
} 

struct key_event
{int name;int value;
};struct samsung
{int major;struct class *cls;struct device *dev;struct key_event key;struct work_struct work;
};static struct samsung *key_dev;void work_key_irq(struct work_struct *work)
{printk("___^_^___ %s\n", __FUNCTION__);
}// 中断处理程序，多个按键可以根据 irqno 区分
irqreturn_t key_irq_handler(int irqno, void *dev_id)
{  int ret;  printk("------------%s-------------\n", __FUNCTION__);  ret = gpio_get_value(key_info[i].key_gpio);  ret ? (key_dev->key.value = 0) : (key_dev->key.value = 1);  printk("key = %d status = %d\n", key_dev->key.name, key_dev->key.value);  schedule_work(&key_dev->work);// 返回值一定要是 IRQ_HANDLED  return IRQ_HANDLED;
}  static int __init key_drv_init(void)
{  ... ...  key_dev->irqno = IRQ_EINT(2);  ret = request_irq(key_dev->irqno, key_irq_handler, IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, "key_eint", NULL);INIT_WORK(&key_dev->work, work_key_irq);... ...
}  static int __exit key_drv_exit(void)
{  ... ...  cancel_work_sync(&key_dev->work);free_irq(key_dev->irqno,NULL);  ... ...
}