USB Tuner driver not detected

I am using a DVB Tuner, USB tuner. I have added driver to the kernel and it is being registered. But when the device is connected, it doesnt invoke the probe function. Is there anything I have to add? Like should the device driver be mapped to the device or something? and please explain how a driver is loaded, based on the type of usb device. The kernel I am using is linux 3.5.