# lsusb -t
/: Bus 07.Port 1: Dev 1, Class=root_hub, Driver=ohci_hcd/2p, 12M
/: Bus 06.Port 1: Dev 1, Class=root_hub, Driver=ohci_hcd/3p, 12M
/: Bus 05.Port 1: Dev 1, Class=root_hub, Driver=ohci_hcd/3p, 12M
|__ Port 3: Dev 2, If 0, Class=HID, Driver=usbhid, 12M
|__ Port 3: Dev 2, If 1...