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There used to be a Linux Device Drivers book https://lwn.net/Kernel/LDD3/

While it's still based on the 2.6 kernel, it's probably good enough for the basics. Not sure there is a more modern source.

(Robert Love's Linux Kernel Programming was also a nice introduction to how the Kernel works, though it might be outdated in some areas now as well)

+1, i like the Linux Device Drivers book _much_ better than the Linux Kernel Module Programming Guide, which is currently recommended in the top comment of this thread.

LDD3 goes way more in-depth and teaches you about the specifics of many different classes of device drivers, their interfaces and data structures, as well as where to find the appropriate in-tree documentation.

(both LDD3 and LKMPG are written for the 2.6 kernel. it's a shame there are no newer resources of the same caliber.)

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