Looking for books - resources for learning how to write Linux drivers

Dear lazy web [0] :

Well, I am really in need of learning how to hack embedded systems. But the task with more priority is to learn how to write drivers (modules) for Linux.

So, my dear lazy web, could you please tell me which books/resources did you find useful to achieve this task?

I have found Bill Gatliff's training courses, but living in Argentina makes things a little too difficult to afford :-(

Comments appreciated :-D

[0] I always wanted to write this :-)

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