[img_assist|nid=236|title=|desc=|link=none|align=left|width=145|height=190]This is the Third Edition of Linux Device Drivers, by Jonathan Corbet, Alessandro Rubini, and Greg Kroah-Hartman. For the moment, only the finished PDF files are available.
This book is available under the terms of the Creative Commons Attribution-ShareAlike 2.0 license. That means that you are free to download and redistribute it. The development of the book was made possible, however, by those who purchased a copy from O'Reilly or elsewhere.
LDD3 is current as of the 2.6.10 kernel. See the LWN 2.6 API changes page for information on subsequent changes.
Download book examples here.