You're looking for a copy of "Linux Device Drivers, 4th Edition" in PDF format, and you'd like to know if it's available on GitHub.
The book "Linux Device Drivers" is a well-known and respected resource for Linux device driver development. The 4th edition of the book was published in 2013 and covers Linux kernel version 3.2.
As for the availability of the book on GitHub, I couldn't find a direct link to a PDF version of the book on GitHub. However, I did find that the source code examples from the book are available on GitHub.