1，实现入口函数 xxx_init()和卸载函数 xxx_exit() 硬件部分初始化构建 file_operation结构 (与内核相关) 实现操作硬件方法 xxx_open,xxx_read,xxxx_write...(与硬件相关)(1, implement the initialization of the entrance function xxx_init () and the uninstall function xxx_exit () hardware part to initi