APC UPS control system - Manual (Page 208)

# CONFIG_USB_CATC is not set
# CONFIG_USB_KAWETH is not set
# CONFIG_USB_PEGASUS is not set
# CONFIG_USB_RTL8150 is not set
# CONFIG_USB_USBNET is not set
#
# USB port drivers
#
# CONFIG_USB_USS720 is not set
#
# USB Serial Converter support
#
# CONFIG_USB_SERIAL is not set
#
# USB Miscellaneous drivers
#
# CONFIG_USB_EMI62 is not set
# CONFIG_USB_EMI26 is not set
# CONFIG_USB_TIGL is not set
# CONFIG_USB_AUERSWALD is not set
# CONFIG_USB_RIO500 is not set
# CONFIG_USB_LEGOTOWER is not set
# CONFIG_USB_LCD is not set
# CONFIG_USB_LED is not set
# CONFIG_USB_CYTHERM is not set
# CONFIG_USB_TEST is not set
#
# USB Gadget Support
#
# CONFIG_USB_GADGET is not set
Interpretation of /proc/usb info on 2.4 kernels:
/proc/bus/usb filesystem output
===============================
(version 2002.03.18)
The /proc filesystem for USB devices provides /proc/bus/usb/drivers
and /proc/bus/usb/devices, as well as /proc/bus/usb/BBB/DDD files.
**NOTE**: If /proc/bus/usb appears empty, and a host controller
driver has been linked, then you need to mount the
filesystem.
Issue the command (as root):
mount -t usbfs none /proc/bus/usb
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