Abra um terminal e digite
lsusbTalvez a descrição diga algo sobre a funcionalidade.
Eu recebo esta saída:
$ lsusb Bus 002 Device 003: ID 04f2:b064 Chicony Electronics Co., Ltd Bus 003 Device 002: ID 046d:c06a Logitech, Inc. Bus 003 Device 003: ID 03f0:0324 Hewlett-Packard SK-2885 keyboard Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hube com isso vejo que eu tenho três dispositivos de entrada (HID): 1 teclado e 2 mouses.