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 */
46