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/*
* Copyright (C) 2015 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program 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.
*
* 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.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
* You can also choose to distribute this program under the terms of
* the Unmodified Binary Distribution Licence (as given in the file
* COPYING.UBDL), provided that you have satisfied its requirements.
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <stddef.h>
#include <ipxe/usb.h>
#include <ipxe/cdc.h>
/** @file
*
* USB Communications Device Class (CDC)
*
*/
/**
* Locate CDC union functional descriptor
*
* @v config Configuration descriptor
* @v interface Interface descriptor
* @ret desc Union functional descriptor, or NULL if not found
*/
struct cdc_union_descriptor *
cdc_union_descriptor ( struct usb_configuration_descriptor *config,
struct usb_interface_descriptor *interface ) {
struct cdc_union_descriptor *desc;
for_each_interface_descriptor ( desc, config, interface ) {
if ( ( desc->header.type == USB_CS_INTERFACE_DESCRIPTOR ) &&
( desc->subtype == CDC_SUBTYPE_UNION ) )
return desc;
}
return NULL;
}
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