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/* SPDX-License-Identifier: LGPL-2.0+ WITH Linux-syscall-note */
* userio: virtual serio device support
* Copyright (C) 2015 Red Hat
* Copyright (C) 2015 Lyude (Stephen Chandler Paul) <>
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser 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 Lesser General Public License for more
* details.
* This is the public header used for user-space communication with the userio
* driver. __attribute__((__packed__)) is used for all structs to keep ABI
* compatibility between all architectures.
#ifndef _USERIO_H
#define _USERIO_H
#include <linux/types.h>
enum userio_cmd_type {
* userio Commands
* All commands sent to /dev/userio are encoded using this structure. The type
* field should contain a USERIO_CMD* value that indicates what kind of command
* is being sent to userio. The data field should contain the accompanying
* argument for the command, if there is one.
struct userio_cmd {
__u8 type;
__u8 data;
} __attribute__((__packed__));
#endif /* !_USERIO_H */