sample USB Driver / Probe not getting called

Hi All, Is there any way to call a sample USB driver whenever a USB device is attached to the system irrespective of the class and type of the device? To do this, LDD3, chap 13 mention that for USB device table, we only need to add the driver_info entry as 42. However if I do this, my probe is never getting called. Now, I give the vendor and product id of this Mouse to the device_id table and load my driver again. Still the probe is not getting called. Is it that USB core is getting the proper driver for this mouse before my driver entry in the list? Am I missing something? Regards, Abhijit Pawar