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- /*
- * Copyright (C) 2014 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.
- */
-
- FILE_LICENCE ( GPL2_OR_LATER );
-
- #include <stdint.h>
- #include <errno.h>
- #include <ipxe/if_ether.h>
- #include <ipxe/base16.h>
- #include <ipxe/usb.h>
- #include "ecm.h"
-
- /** @file
- *
- * CDC-ECM USB Ethernet driver
- *
- */
-
- /**
- * Locate Ethernet functional descriptor
- *
- * @v config Configuration descriptor
- * @v interface Interface descriptor
- * @ret desc Descriptor, or NULL if not found
- */
- struct ecm_ethernet_descriptor *
- ecm_ethernet_descriptor ( struct usb_configuration_descriptor *config,
- struct usb_interface_descriptor *interface ) {
- struct ecm_ethernet_descriptor *desc;
-
- for_each_interface_descriptor ( desc, config, interface ) {
- if ( ( desc->header.type == USB_CS_INTERFACE_DESCRIPTOR ) &&
- ( desc->subtype == CDC_SUBTYPE_ETHERNET ) )
- return desc;
- }
- return NULL;
- }
-
- /**
- * Get hardware MAC address
- *
- * @v usb USB device
- * @v desc Ethernet functional descriptor
- * @v hw_addr Hardware address to fill in
- * @ret rc Return status code
- */
- int ecm_fetch_mac ( struct usb_device *usb,
- struct ecm_ethernet_descriptor *desc, uint8_t *hw_addr ) {
- char buf[ base16_encoded_len ( ETH_ALEN ) + 1 /* NUL */ ];
- int len;
- int rc;
-
- /* Fetch MAC address string */
- len = usb_get_string_descriptor ( usb, desc->mac, 0, buf,
- sizeof ( buf ) );
- if ( len < 0 ) {
- rc = len;
- return rc;
- }
-
- /* Sanity check */
- if ( len != ( ( int ) ( sizeof ( buf ) - 1 /* NUL */ ) ) )
- return -EINVAL;
-
- /* Decode MAC address */
- len = base16_decode ( buf, hw_addr );
- if ( len < 0 ) {
- rc = len;
- return rc;
- }
-
- return 0;
- }
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