uapi/linux/userio.h

0001 /* SPDX-License-Identifier: LGPL-2.0+ WITH Linux-syscall-note */
0002 /*
0003  * userio: virtual serio device support
0004  * Copyright (C) 2015 Red Hat
0005  * Copyright (C) 2015 Lyude (Stephen Chandler Paul) <cpaul@redhat.com>
0006  *
0007  * This program is free software; you can redistribute it and/or modify it
0008  * under the terms of the GNU Lesser General Public License as published by the
0009  * Free Software Foundation; either version 2 of the License, or (at your
0010  * option) any later version.
0011  *
0012  * This program is distributed in the hope that it will be useful, but WITHOUT
0013  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
0014  * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
0015  * details.
0016  *
0017  * This is the public header used for user-space communication with the userio
0018  * driver. __attribute__((__packed__)) is used for all structs to keep ABI
0019  * compatibility between all architectures.
0020  */
0021
0022 #ifndef _USERIO_H
0023 #define _USERIO_H
0024
0025 #include <linux/types.h>
0026
0027 enum userio_cmd_type {
0028     USERIO_CMD_REGISTER = 0,
0029     USERIO_CMD_SET_PORT_TYPE = 1,
0030     USERIO_CMD_SEND_INTERRUPT = 2
0031 };
0032
0033 /*
0034  * userio Commands
0035  * All commands sent to /dev/userio are encoded using this structure. The type
0036  * field should contain a USERIO_CMD* value that indicates what kind of command
0037  * is being sent to userio. The data field should contain the accompanying
0038  * argument for the command, if there is one.
0039  */
0040 struct userio_cmd {
0041     __u8 type;
0042     __u8 data;
0043 } __attribute__((__packed__));
0044
0045 #endif /* !_USERIO_H */