diff options
Diffstat (limited to 'qemu/roms/ipxe/src/drivers/bus/cdc.c')
-rw-r--r-- | qemu/roms/ipxe/src/drivers/bus/cdc.c | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/qemu/roms/ipxe/src/drivers/bus/cdc.c b/qemu/roms/ipxe/src/drivers/bus/cdc.c new file mode 100644 index 000000000..373a03072 --- /dev/null +++ b/qemu/roms/ipxe/src/drivers/bus/cdc.c @@ -0,0 +1,54 @@ +/* + * 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; +} |