Linux Device Drivers Development

Typical packt stuff. Better read original documentation, buried under Documentation/, where the author seems to have dug out almost everything, try to write code yourself, experiment, consult the source and don't waste your time, subscribe to LWN. Author doesn't explain much of conceptions behind LDD API (as for example why there's class and bus, if they seem to interfere, why is workqueue a bus and such). He just throws in everything together from what he was able to find. Simple enumeration of subsystems and paraphrasing *.rst's ain't big deal and definitely not enough to write a good book. It's difficult to write a good book and author has failed his first attempt.