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Basically what your doing wrong is not understanding the hierarchy of USB devices on your system's bus. What is happening is your trying to register a USB device where the Id marco is not the correct one in the hierarchy and therefore is over ruled by the one from usbhid. If you send your complete code to the list I can try and see if there are other issues but that's the most likely. Nick

Thanks a lot! I have posted the complete code previously on this thread, but it doesn't have much. I'll see what I can find out about the usb subsystem hierarchy. Any recommended resources I could use to learn more about the usb (and other) subsystems (e.g. pci, etc.) other than LDD?

I used Essential Linux Device Drivers as my resource. Also look in the driver source code for usb keyboard driver and read through it. If you can't find it I will point it out to you but that should get you started. One piece of advice is when writing drivers, try to find one in the drivers folder with similar hardware/requirements to base your driver off of that your writing. Also don't ask about challenges like this on the list as there meant to be self taught. Hope that Helps, Nick

Thanks, I'll see what I can find. Again, my question has nothing to do with the challenge. -- Armin Moradi