1#ifndef __UHID_H_
2#define __UHID_H_
3
4/*
5 * User-space I/O driver support for HID subsystem
6 * Copyright (c) 2012 David Herrmann
7 */
8
9/*
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the Free
12 * Software Foundation; either version 2 of the License, or (at your option)
13 * any later version.
14 */
15
16/*
17 * Public header for user-space communication. We try to keep every structure
18 * aligned but to be safe we also use __attribute__((__packed__)). Therefore,
19 * the communication should be ABI compatible even between architectures.
20 */
21
22#include <linux/input.h>
23#include <linux/types.h>
24
25enum uhid_event_type {
26	UHID_CREATE,
27	UHID_DESTROY,
28	UHID_START,
29	UHID_STOP,
30	UHID_OPEN,
31	UHID_CLOSE,
32	UHID_OUTPUT,
33	UHID_OUTPUT_EV,			/* obsolete! */
34	UHID_INPUT,
35	UHID_FEATURE,
36	UHID_FEATURE_ANSWER,
37};
38
39struct uhid_create_req {
40	__u8 name[128];
41	__u8 phys[64];
42	__u8 uniq[64];
43	__u8 __user *rd_data;
44	__u16 rd_size;
45
46	__u16 bus;
47	__u32 vendor;
48	__u32 product;
49	__u32 version;
50	__u32 country;
51} __attribute__((__packed__));
52
53#define UHID_DATA_MAX 4096
54
55enum uhid_report_type {
56	UHID_FEATURE_REPORT,
57	UHID_OUTPUT_REPORT,
58	UHID_INPUT_REPORT,
59};
60
61struct uhid_input_req {
62	__u8 data[UHID_DATA_MAX];
63	__u16 size;
64} __attribute__((__packed__));
65
66struct uhid_output_req {
67	__u8 data[UHID_DATA_MAX];
68	__u16 size;
69	__u8 rtype;
70} __attribute__((__packed__));
71
72/* Obsolete! Newer kernels will no longer send these events but instead convert
73 * it into raw output reports via UHID_OUTPUT. */
74struct uhid_output_ev_req {
75	__u16 type;
76	__u16 code;
77	__s32 value;
78} __attribute__((__packed__));
79
80struct uhid_feature_req {
81	__u32 id;
82	__u8 rnum;
83	__u8 rtype;
84} __attribute__((__packed__));
85
86struct uhid_feature_answer_req {
87	__u32 id;
88	__u16 err;
89	__u16 size;
90	__u8 data[UHID_DATA_MAX];
91} __attribute__((__packed__));
92
93struct uhid_event {
94	__u32 type;
95
96	union {
97		struct uhid_create_req create;
98		struct uhid_input_req input;
99		struct uhid_output_req output;
100		struct uhid_output_ev_req output_ev;
101		struct uhid_feature_req feature;
102		struct uhid_feature_answer_req feature_answer;
103	} u;
104} __attribute__((__packed__));
105
106#endif /* __UHID_H_ */
107