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