The LCD Wiki page

Well, it seems your wiki repo is not up to date. ;)
Just review my Using-the-LCD.md

It is better to get all of this information from ioctl. We could change the driver in the future and it may not always return the same information. See https://gitorious.org/gade-pdf-la/gade-pdf-la/commit/70fe9e32b49537de4fa9f2428ec1d5196cd76378 for an example of how to do this in python.