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I've found the "Linux Device Drivers" book from O'Reilly to be very helpful. I started with the first edition (2.0), then got the 2nd edition (2.2 & 2.4). I'll be getting the 3rd edition once I get my cash flow going again.
Also note that the kernel module interface is slightly different between 2.4 and 2.6. The best source of information is always the source-code itself ... the Documentation folders therein ... and existing device-drivers supplied with it which may prove to be similar to yours.
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