sysfs文件系统相关资料

1) Greg Kroah-Hartman  How to create a sysfs file correctly        http://kroah.com/log/blog/2013/06/26/how-to-create-a-sysfs-file-correctly/

2)  IBM 文档 https://www.ibm.com/developerworks/cn/linux/l-cn-sysfs/

3）老文档 https://www.kernel.org/pub/linux/kernel/people/mochel/doc/papers/ols-2005/mochel.pdf