drivers misc

module_platform_driver(xxx)最终展开后就是如下形式：
static int __init xxx_init(void)
{undefined
return platform_driver_register(&xxx);
}
module_init(xxx_init);
static void __exit xxx_init(void)
{undefined
return platform_driver_unregister(&xxx);
}
module_exit(xxx_exit);

from:
https://blog.csdn.net/qq_37858386/article/details/79825717