You should get information about the USB controller with cat /proc/pci and about USB devices with cat /proc/bus/usb/devices.
Newer laptops come with the Universal Serial Bus (USB). I haven't tried it on any of my systems because I don't have any USB devices.
Visit the USB Linux home page. Also I have set up a page collecting information about laptops and USB at LiLAC - Linux with Laptop Computers .