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Moderator note: I moved the post out of the thread it was posted to, because I think it will get more responses in a separate one.
First, you need to get to know the device you're going to write the driver for. Read the documentation.
Then, try to find a driver for a similar one. Older model, maybe? Look into Linux source code. When you have it, take it and start replacing the functions that deal directly with the device with the ones that will work with yours. Test as soon as possible.
During that process, read Linux Device Drivers. It is an useful read.
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