CONFIG_USBD
  Universal Serial Bus (USB) is a specification for a serial bus
  subsystem which offers higher speeds and more features than the
  traditional PC serial port. The bus supplies power to peripherals
  and allows for hot swapping. Up to 127 USB peripherals can be
  connected to a single USB port in a tree structure. The USB port is
  the root of the tree, the peripherals are the leaves and the inner
  nodes are special USB devices called hubs. Many newer PC's have USB
  ports and newer peripherals such as scanners, keyboards, mice,
  modems, and printers support the USB protocol and can be connected
  to the PC via those ports.

  Say Y here if your computer has a USB Function / Device port and you
  want to plug it into a USB Host. You then need to say Y to a MINIMUM
  OF ONE of "USB Function Drivers" and a MAXIMUM of one of the "USB
  Device Bus Interface Drivers".  Normally only one bus interface
  driver is available for any architecture.

  If you have any doubt about what this is, say N here.

  This code is also available as a module ( = code which can be
  inserted in and removed from the running kernel whenever you want).
  The module will be called usbd.o. If you want to compile it as a
  module, say M here and read Documentation/modules.txt.

CONFIG_USBD_VENDORID
  Specify the USB Device Vendor ID.

CONFIG_USBD_PRODUCTID
  Specify the USB Device Product ID.

CONFIG_USBD_PRODUCT_NAME
  Specify the USB Device Product name.

CONFIG_USBD_MANUFACTURER
  Specify the USB Device Manufacturer name.

CONFIG_USBD_USE_SERIAL_NUMBER
  Specify whether the device serial number should be used in the device
  descriptor.

CONFIG_USBD_SERIAL_NUMBER_STR
  Specify a default serial number. This will be used if the bus interface
  driver cannot determine a serial number for the device.

CONFIG_USBD_SELFPOWERED
  Is the device self powered. This is used to set the appropriate flag
  in the configuration descriptor.

CONFIG_USBD_MAXPOWER
  Specify the maximum power draw for this device in milli-amps (ma).
  This is used in the configuration descriptor if the Self Powered 
  flag is NOT set.

CONFIG_USBD_MONITOR
  Enable a small module that will monitor for the USB Device being 
  connected to a host. It will load and unload the rest of the USB
  Device software via the hotplug facility.

  Hotplug will call the usbd.agent with:

  	INTERFACE=monitor

  And one of:

	ACTION=load		# called when connected to USB 
	ACTION=unload		# called when dis-connected from USB 
	ACTION=off		# called when power down invoked

  The power down action is invoked if the local power management software
  is putting the local system into standby or power off mode. This is 
  not invoked for a USB suspend event (which would be handled by the
  USB Device software).

CONFIG_USBD_PROCFS
  Enable a proc file system for the USB Device support.