详细注释FL2440按键中断驱动（含poll机制）(二)

gpfcon = (volatile unsigned long *)ioremap(0x56000050, 16);//IO口引脚物理地址转为虚拟地址
gpfdat = gpfcon + 1;

return 0;
}

static void third_drv_exit(void)//从内核卸载模块
{
unregister_chrdev(major, "third_drv");
device_unregister(thirddrv_class_dev);
class_destroy(thirddrv_class);
iounmap(gpfcon);
iounmap(gpgcon);

return 0;
}

module_init(third_drv_init);

module_exit(third_drv_exit);

MODULE_LICENSE("GPL");