55 lines
1.7 KiB
C
55 lines
1.7 KiB
C
/*
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* Copyright (C) 2015 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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* You can also choose to distribute this program under the terms of
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* the Unmodified Binary Distribution Licence (as given in the file
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* COPYING.UBDL), provided that you have satisfied its requirements.
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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#include <stddef.h>
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#include <ipxe/usb.h>
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#include <ipxe/cdc.h>
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/** @file
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*
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* USB Communications Device Class (CDC)
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*
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*/
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/**
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* Locate CDC union functional descriptor
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*
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* @v config Configuration descriptor
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* @v interface Interface descriptor
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* @ret desc Union functional descriptor, or NULL if not found
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*/
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struct cdc_union_descriptor *
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cdc_union_descriptor ( struct usb_configuration_descriptor *config,
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struct usb_interface_descriptor *interface ) {
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struct cdc_union_descriptor *desc;
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for_each_interface_descriptor ( desc, config, interface ) {
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if ( ( desc->header.type == USB_CS_INTERFACE_DESCRIPTOR ) &&
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( desc->subtype == CDC_SUBTYPE_UNION ) )
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return desc;
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}
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return NULL;
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}
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