1 /*
2 * Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation; either version 2 of the
7 * License, or any later version.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17 */
18
19 FILE_LICENCE ( GPL2_OR_LATER );
20
21 #include <stdint.h>
22 #include <errno.h>
23 #include <gpxe/iobuf.h>
24 #include <gpxe/netdevice.h>
25
26 /** @file
27 *
28 * Null network device
29 *
30 */
31
null_open(struct net_device * netdev __unused)32 static int null_open ( struct net_device *netdev __unused ) {
33 return -ENODEV;
34 };
35
null_close(struct net_device * netdev __unused)36 static void null_close ( struct net_device *netdev __unused ) {
37 /* Do nothing */
38 };
39
null_transmit(struct net_device * netdev __unused,struct io_buffer * iobuf __unused)40 static int null_transmit ( struct net_device *netdev __unused,
41 struct io_buffer *iobuf __unused ) {
42 return -ENODEV;
43 };
44
null_poll(struct net_device * netdev __unused)45 static void null_poll ( struct net_device *netdev __unused ) {
46 /* Do nothing */
47 }
48
null_irq(struct net_device * netdev __unused,int enable __unused)49 static void null_irq ( struct net_device *netdev __unused,
50 int enable __unused ) {
51 /* Do nothing */
52 }
53
54 struct net_device_operations null_netdev_operations = {
55 .open = null_open,
56 .close = null_close,
57 .transmit = null_transmit,
58 .poll = null_poll,
59 .irq = null_irq,
60 };
61