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my saving grace is that i have managed to get a pdf copy of what i believe is the exact "how to write a driver" book that the authors of the driver i am trying to re-write used

and i believe their driver began as a carbon copy of all of the example code from that book, shoved together into a single project

most of the rest of the functionality looks like stuff that started out in the userland side of the stack (which i have source for), and was eventually #ifdef'd out and moved into the kernel driver (conveniently with a comment to that effect in some instances)