Provided by: linux-doc-2.6.15_2.6.15-23.39_all bug

NAME

       usb_claim_bandwidth - records bandwidth for a periodic transfer

SYNOPSIS

       void usb_claim_bandwidth  (struct usb_device * dev, struct urb * urb,
                                   int bustime, int isoc);

ARGUMENTS

       dev    source/target of request

       urb    request (urb->dev == dev)

       bustime
              bandwidth consumed, in (average) microseconds per frame

       isoc   true iff the request is isochronous

DESCRIPTION

       Bus bandwidth reservations are recorded purely for diagnostic purposes.
       HCDs  are  expected not to overcommit periodic bandwidth, and to record
       such  reservations  whenever  endpoints  are  added  to  the   periodic
       schedule.

       FIXME  averaging  per-frame is suboptimal. Better to sum over the HCD’s
       entire periodic schedule  ...  32  frames  for  OHCI,  1024  for  UHCI,
       settable  for EHCI (256/512/1024 frames, default 1024) and have the bus
       expose how large its periodic schedule is.