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uhid.h
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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 
25 enum 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,
34  UHID_INPUT,
35  UHID_FEATURE,
36  UHID_FEATURE_ANSWER,
37 };
38 
39 struct 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 
55 enum uhid_report_type {
56  UHID_FEATURE_REPORT,
57  UHID_OUTPUT_REPORT,
58  UHID_INPUT_REPORT,
59 };
60 
61 struct uhid_input_req {
62  __u8 data[UHID_DATA_MAX];
63  __u16 size;
64 } __attribute__((__packed__));
65 
66 struct uhid_output_req {
67  __u8 data[UHID_DATA_MAX];
68  __u16 size;
69  __u8 rtype;
70 } __attribute__((__packed__));
71 
72 struct uhid_output_ev_req {
73  __u16 type;
74  __u16 code;
75  __s32 value;
76 } __attribute__((__packed__));
77 
78 struct uhid_feature_req {
79  __u32 id;
80  __u8 rnum;
81  __u8 rtype;
82 } __attribute__((__packed__));
83 
84 struct uhid_feature_answer_req {
85  __u32 id;
86  __u16 err;
87  __u16 size;
88  __u8 data[UHID_DATA_MAX];
89 };
90 
91 struct uhid_event {
92  __u32 type;
93 
94  union {
95  struct uhid_create_req create;
96  struct uhid_input_req input;
97  struct uhid_output_req output;
98  struct uhid_output_ev_req output_ev;
99  struct uhid_feature_req feature;
100  struct uhid_feature_answer_req feature_answer;
101  } u;
102 } __attribute__((__packed__));
103 
104 #endif /* __UHID_H_ */
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