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 Paul <thatslyude@gmail.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 USERIO_CMD_SET_PORT_EXTRA = 3, 32 USERIO_CMD_SET_PORT_ID = 4, 33 USERIO_CMD_SET_PORT_PROTO = 5, 34 }; 35 36 /* 37 * userio Commands 38 * All commands sent to /dev/userio are encoded using this structure. The type 39 * field should contain a USERIO_CMD* value that indicates what kind of command 40 * is being sent to userio. The data field should contain the accompanying 41 * argument for the command, if there is one. 42 */ 43 struct userio_cmd { 44 __u8 type; 45 __u8 data; 46 } __attribute__((__packed__)); 47 48 #endif /* !_USERIO_H */ 49