How to solve module collision

Hi, I would like to write a driver for my usb mouse. It functions normally with kernel driver, nonetheless, I want to study usb system. When the kernel executes the probe function, what would happen if there exists two suitable drivers. And how can I override the existed kernel driver? I guess that the the interface buffer would be emptied since either one of the drivers grab it, if the kernel mouse driver contends for usb data with my driver, what should I do? Or if both of us strive to control the device, what can be done to avoid this. Thanks, Jimmy