code: def is_kernel_driver_active(self, interface):
          r
          self._ctx.managed_open()
          return self._ctx.backend.is_kernel_driver_active(
                  self._ctx.handle,
                  interface)
docs: r"""Determine if there is kernel driver associated with the interface.
  
          If a kernel driver is active, the object will be unable to perform
          I/O.
  
          The interface parameter is the device interface number to check.