centos man page for usb_ep_fifo_status

Query: usb_ep_fifo_status

OS: centos

Section: 9

Format: Original Unix Latex Style Formatted with HTML and a Horizontal Scroll Bar

USB_EP_FIFO_STATUS(9)					      Kernel Mode Gadget API					     USB_EP_FIFO_STATUS(9)

NAME
usb_ep_fifo_status - returns number of bytes in fifo, or error
SYNOPSIS
int usb_ep_fifo_status(struct usb_ep * ep);
ARGUMENTS
ep the endpoint whose fifo status is being checked.
DESCRIPTION
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 handling.
AUTHOR
David Brownell <dbrownell@users.sourceforge.net> Author.
COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 USB_EP_FIFO_STATUS(9)
Related Man Pages
struct_usb_gadget(9) - centos
struct_usb_ep(9) - centos
struct_usb_request(9) - centos
usb_ep_queue(9) - centos
struct_usb_composite_dev(9) - suse
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