'\" t
.\"     Title: usb_ep_fifo_status
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
.\"      Date: May 2018
.\"    Manual: Kernel Mode Gadget API
.\"    Source: Kernel Hackers Manual 3.16.56
.\"  Language: English
.\"
.TH "USB_EP_FIFO_STATUS" "9" "May 2018" "Kernel Hackers Manual 3\&.16\&" "Kernel Mode Gadget API"
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.SH "NAME"
usb_ep_fifo_status \- returns number of bytes in fifo, or error
.SH "SYNOPSIS"
.HP \w'int\ usb_ep_fifo_status('u
.BI "int usb_ep_fifo_status(struct\ usb_ep\ *\ " "ep" ");"
.SH "ARGUMENTS"
.PP
\fIep\fR
.RS 4
the endpoint whose fifo status is being checked\&.
.RE
.SH "DESCRIPTION"
.PP
FIFO endpoints may have
\(lqunclaimed data\(rq
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\&.
.PP
This returns the number of such bytes in the fifo, or a negative errno if the endpoint doesn\*(Aqt use a FIFO or doesn\*(Aqt support such precise handling\&.
.SH "AUTHOR"
.PP
\fBDavid Brownell\fR <\&dbrownell@users.sourceforge.net\&>
.RS 4
Author.
.RE
.SH "COPYRIGHT"
.br