1 /* SPDX-License-Identifier: LGPL-2.0+ WITH Linux-syscall-note */
2 /*
3 * userio: virtual serio device support
4 * Copyright (C) 2015 Red Hat
5 * Copyright (C) 2015 Lyude (Stephen Chandler Paul) <cpaul@redhat.com>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU Lesser General Public License as published by the
9 * Free Software Foundation; either version 2 of the License, or (at your
10 * option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
14 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
15 * details.
16 *
17 * This is the public header used for user-space communication with the userio
18 * driver. __attribute__((__packed__)) is used for all structs to keep ABI
19 * compatibility between all architectures.
20 */
21
22 #ifndef _USERIO_H
23 #define _USERIO_H
24
25 #include <linux/types.h>
26
27 enum userio_cmd_type {
28 USERIO_CMD_REGISTER = 0,
29 USERIO_CMD_SET_PORT_TYPE = 1,
30 USERIO_CMD_SEND_INTERRUPT = 2
31 };
32
33 /*
34 * userio Commands
35 * All commands sent to /dev/userio are encoded using this structure. The type
36 * field should contain a USERIO_CMD* value that indicates what kind of command
37 * is being sent to userio. The data field should contain the accompanying
38 * argument for the command, if there is one.
39 */
40 struct userio_cmd {
41 __u8 type;
42 __u8 data;
43 } __attribute__((__packed__));
44
45 #endif /* !_USERIO_H */