driver for USB joystick Logitech Rambler 2

Hi, Everyone:

I use Linux Ubuntu Feisty Fawn. I am new to Linux driver programming
although I know C language. I want to obtain or write a driver for a
USB joystick RumblePad2 from Logitech. I have perused the well
referenced book 'Linux Device Drivers' but I still cannot connect the
dots.

I am trying to understand how can I assign a driver to a device. The
device is being recognized by the system and there is a file /dev/
input/event4. I don't know what driver is assigned to that file.
Whatever that driver is, how can I assign my own driver to that device/
file ? If I cannot do it as a user or root, what system files do I
have to edit? Suppose that I want the system to use USB mouse driver
to communicate with the RumblePad. How do I do that?

Thanks for your help,

Simon

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