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.TH "USB_IFNUM_TO_IF" "9" "07 August 2003" "" ""
.SH NAME
usb_ifnum_to_if \- get the interface object with a given interface number (usbcore-internal)
.SH 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.
.SH "ABOUT THIS DOCUMENT"
.PP
This documentation is free software; you can redistribute
it and/or modify it under the terms of the GNU General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later
version.
.PP
This program is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied
warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
.PP
You should have received a copy of the GNU General Public
License along with this program; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
MA 02111-1307 USA
.PP
For more details see the file COPYING in the source
distribution of Linux.
.PP
If you have comments on the formatting of this manpage, then please contact
Michael Still (mikal@stillhq.com).
.PP
This documentation was generated with kernel version 2.6.0.