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.TH "USB_EPNUM_TO_EP_DESC" "" "06 October 2005" "" ""

.SH NAME
usb_epnum_to_ep_desc \- get the endpoint object with a given endpoint number
.SH SYNOPSIS
"SYNOPSIS"
.sp
\fB
.sp
struct usb_endpoint_descriptor * usb_epnum_to_ep_desc  (struct usb_device * \fIdev\fB, unsigned \fIepnum\fB);
\fR
.SH "ARGUMENTS"
.TP
\fB\fIdev\fB\fR
the device whose current configuration+altsettings is considered
.TP
\fB\fIepnum\fB\fR
the desired endpoint, masked with USB_DIR_IN as appropriate.
.SH "DESCRIPTION"
.PP
This walks the device descriptor for the currently active configuration,
and returns a pointer to the endpoint with that particular endpoint
number, or null.
.PP
Note that interface descriptors are not required to list endpoint
numbers in any standardized order, so that it would be wrong to
assume that ep2in precedes either ep5in, ep2out, or even ep1out.
This routine helps device drivers avoid such mistakes.