include/uapi/linux/userio.h

   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 */