Provided by: linux-doc-2.6.15_2.6.15-23.39_all
usb_ep_fifo_status - returns number of bytes in fifo, or error
int usb_ep_fifo_status (struct usb_ep * ep);
ep the endpoint whose fifo status is being checked.
FIFO endpoints may have ‘‘unclaimed data’’ in them in certain cases,
such as after aborted transfers. Hosts may not have collected all the
IN data written by the gadget driver (and reported by a request
completion). The gadget driver may not have collected all the data
written OUT to it by the host. Drivers that need precise handling for
fault reporting or recovery may need to use this call.
This returns the number of such bytes in the fifo, or a negative errno
if the endpoint doesn’t use a FIFO or doesn’t support such precise
David Brownell <email@example.com>.