I see the following messages in my /var/log/messages file when the USB ports are enabled:
usb.c: registered new driver usbdevfs
usb.c: registered new driver hub
...
host/usb-uhci.c: High bandwidth mode enabled
...
host/usb-uhci.c: USB UHCI at I/O 0xe000, IRQ 5
host/usb-uhci.c: Detected 2 ports
usb.c: new USB bus registered, assigned bus number 1
hub.c: USB hub found
hub.c: 2 ports detected
host/usb-uhci.c: v1.275:USB Universal Host Controller Interface driver
usb.c: registered new driver hid
hid-core.c: v1.8.1 Andreas Gal, Vojtech Pavlik <vojtech@suse.cz>
hid-core.c: USB HID support drivers
I also see usbdevfs and usbfs listed in /proc/filesystems
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