Here is 'lsusb' listing:
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 003: ID 09da:0006 A4 Tech Co., Ltd Optical Mouse WOP-35 / Trust 450L Optical Mouse
Bus 002 Device 002: ID 0483:0138 SGS Thomson Microelectronics
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
And here's 'dmesg | grep usb':
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
usb usb1: configuration #1 chosen from 1 choice
usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb1: Product: EHCI Host Controller
usb usb1: Manufacturer: Linux 2.6.27.7-smp ehci_hcd
usb usb1: SerialNumber: 0000:00:10.3
usb usb2: configuration #1 chosen from 1 choice
usb usb2: New USB device found, idVendor=1d6b, idProduct=0001
usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb2: Product: UHCI Host Controller
usb usb2: Manufacturer: Linux 2.6.27.7-smp uhci_hcd
usb usb2: SerialNumber: 0000:00:10.0
usb usb3: configuration #1 chosen from 1 choice
usb 2-1: new full speed USB device using uhci_hcd and address 2
usb usb3: New USB device found, idVendor=1d6b, idProduct=0001
usb usb3: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb3: Product: UHCI Host Controller
usb usb3: Manufacturer: Linux 2.6.27.7-smp uhci_hcd
usb usb3: SerialNumber: 0000:00:10.1
usb usb4: configuration #1 chosen from 1 choice
usb 2-1: configuration #1 chosen from 1 choice
usb 2-1: New USB device found, idVendor=0483, idProduct=0138
usb 2-1: New USB device strings: Mfr=0, Product=1, SerialNumber=2
usb 2-1: Product: ADSL MODEM
usb 2-1: SerialNumber: 0000000000000000
usb 2-2: new low speed USB device using uhci_hcd and address 3
usb usb4: New USB device found, idVendor=1d6b, idProduct=0001
usb usb4: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb4: Product: UHCI Host Controller
usb usb4: Manufacturer: Linux 2.6.27.7-smp uhci_hcd
usb usb4: SerialNumber: 0000:00:10.2
usb 2-2: configuration #1 chosen from 1 choice
usb 2-2: New USB device found, idVendor=09da, idProduct=0006
usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
usb 2-2: Product: USB Optical Mouse
usb 2-2: Manufacturer: A4Tech
usbcore: registered new interface driver usb-storage
usbcore: registered new interface driver hiddev
input: A4Tech USB Optical Mouse as /devices/pci0000:00/0000:00:10.0/usb2/2-2/2-2:1.0/input/input1
input,hidraw0: USB HID v1.10 Mouse [A4Tech USB Optical Mouse] on usb-0000:00:10.0-2
usbcore: registered new interface driver usbhid
usbhid: v2.6:USB HID core driver