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.TH "USB_IFNUM_TO_IF" "" "06 October 2005" "" ""

.SH NAME
usb_ifnum_to_if \- get the interface object with a given interface number (usbcore-internal)
.SH SYNOPSIS
"SYNOPSIS"
.sp
\fB
.sp
struct usb_interface * usb_ifnum_to_if  (struct usb_device * \fIdev\fB, unsigned \fIifnum\fB);
\fR
.SH "ARGUMENTS"
.TP
\fB\fIdev\fB\fR
the device whose current configuration is considered
.TP
\fB\fIifnum\fB\fR
the desired interface
.SH "DESCRIPTION"
.PP
This walks the device descriptor for the currently active configuration
and returns a pointer to the interface with that particular interface
number, or null.
.PP
Note that configuration descriptors are not required to assign interface
numbers sequentially, so that it would be incorrect to assume that
the first interface in that descriptor corresponds to interface zero.
This routine helps device drivers avoid such mistakes.
However, you should make sure that you do the right thing with any
alternate settings available for this interfaces.