From dmesg:
usb 3-2: new full speed USB device using ohci_hcd and address 2 <--------------- This is the device, in dmesg
usb 3-2: configuration #1 chosen from 1 choice
*-usb:1
description: USB Controller
product: IXP SB400 USB Host Controller
vendor: ATI Technologies Inc
physical id: 13.1
bus info: pci@0000:00:13.1
version: 00
width: 32 bits
clock: 66MHz
capabilities: msi ohci bus_master cap_list
configuration: driver=ohci_hcd latency=64 module=ohci_hcd
*-usbhost
product: OHCI Host Controller
vendor: Linux 2.6.16-gentoo-r13 ohci_hcd
physical id: 1
bus info: usb@3
logical name: usb3
version: 2.06
capabilities: usb-1.10
configuration: driver=hub maxpower=0mA slots=4 speed=12.0MB/s
*-usb UNCLAIMED <------------------------------------------------------------------ This is the device
description: Generic USB device
vendor: Oxford Semiconductor, Ltd
physical id: 2
bus info: usb@3:2
version: ff.ff
capabilities: usb-1.10
configuration: maxpower=0mA speed=12.0MB/s