dmesg | grep USB
[    8.898658] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    8.944117] sunxi-ehci 1c1a000.ehci0-controller: SW USB2.0 'Enhanced' Host Controller (EHCI) Driver
[    8.960451] sunxi-ehci 1c1a000.ehci0-controller: new USB bus registered, assigned bus number 1
[    9.002076] sunxi-ehci 1c1a000.ehci0-controller: USB 0.0 started, EHCI 1.00
[    9.016520] hub 1-0:1.0: USB hub found
[    9.081363] sunxi-ehci 1c1b000.ehci1-controller: SW USB2.0 'Enhanced' Host Controller (EHCI) Driver
[    9.098000] sunxi-ehci 1c1b000.ehci1-controller: new USB bus registered, assigned bus number 2
[    9.139811] sunxi-ehci 1c1b000.ehci1-controller: USB 0.0 started, EHCI 1.00
[    9.165548] hub 2-0:1.0: USB hub found
[    9.198174] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[    9.251956] sunxi-ohci 1c1a000.ohci0-controller: SW USB2.0 'Open' Host Controller (OHCI) Driver
[    9.267936] sunxi-ohci 1c1a000.ohci0-controller: new USB bus registered, assigned bus number 3
[    9.360560] hub 3-0:1.0: USB hub found
[    9.433388] sunxi-ohci 1c1b000.ohci1-controller: SW USB2.0 'Open' Host Controller (OHCI) Driver
[    9.449638] sunxi-ohci 1c1b000.ohci1-controller: new USB bus registered, assigned bus number 4
[    9.503898] usb 2-1: new high-speed USB device number 2 using sunxi-ehci
[    9.537668] hub 4-0:1.0: USB hub found
[    9.689405] hub 2-1:1.0: USB hub found
[    9.798800] usbserial: USB Serial support registered for generic
[    9.980845] usb 2-1.2: new full-speed USB device number 3 using sunxi-ehci
[   10.617370] input: C-Media Electronics Inc.       USB PnP Sound Device as /devices/soc.0/1c1b000.ehci1-controller/usb2/2-1/2-1.2/2-1.2:1.3/input/input1
[   10.637988] hid-generic 0003:0D8C:013C.0001: input: USB HID v1.00 Device [C-Media Electronics Inc.       USB PnP Sound Device] on usb-sunxi-ehci-1.2/input3
[   10.670847] usbhid: USB HID core driver
[  449.458890] usb 2-1.2: USB disconnect, device number 3