lsusb -t
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/8p, 480M
|__ Port 2: Dev 3, If 0, Class=Mass Storage, Driver=usb-storage, 480M
|__ Port 3: Dev 13, If 2, Class=Human Interface Device, Driver=usbhid, 12M
|__ Port 3: Dev 13, If 0, Class=Audio, Driver=snd-usb-audio, 12M
|__ Port 3: Dev 13, If 1, Class=Audio, Driver=snd-usb-audio, 12M
|__ Port 4: Dev 14, If 1, Class=Audio, Driver=snd-usb-audio, 12M
|__ Port 4: Dev 14, If 2, Class=Human Interface Device, Driver=usbhid, 12M
|__ Port 4: Dev 14, If 0, Class=Audio, Driver=snd-usb-audio, 12M
|__ Port 5: Dev 5, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
|__ Port 5: Dev 5, If 1, Class=Human Interface Device, Driver=usbhid, 1.5M
|__ Port 7: Dev 6, If 0, Class=Human Interface Device, Driver=usbhid, 12M
|__ Port 7: Dev 6, If 1, Class=Human Interface Device, Driver=usbhid, 12M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/6p, 480M
|__ Port 5: Dev 3, If 0, Class=Audio, Driver=snd-usb-audio, 12M
|__ Port 5: Dev 3, If 1, Class=Audio, Driver=snd-usb-audio, 12M
|__ Port 5: Dev 3, If 2, Class=Audio, Driver=snd-usb-audio, 12M
|__ Port 5: Dev 3, If 3, Class=Human Interface Device, Driver=usbhid, 12M