5 * User-space I/O driver support for HID subsystem
6 * Copyright (c) 2012 David Herrmann
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)
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.
22 #include <linux/input.h>
23 #include <linux/types.h>
24 #include <linux/hid.h>
26 enum uhid_event_type {
34 __UHID_LEGACY_OUTPUT_EV,
37 UHID_GET_REPORT_REPLY,
41 UHID_SET_REPORT_REPLY,
44 struct uhid_create2_req {
54 __u8 rd_data[HID_MAX_DESCRIPTOR_SIZE];
55 } __attribute__((__packed__));
57 #define UHID_DATA_MAX 4096
59 enum uhid_report_type {
65 struct uhid_input2_req {
67 __u8 data[UHID_DATA_MAX];
68 } __attribute__((__packed__));
70 struct uhid_output_req {
71 __u8 data[UHID_DATA_MAX];
74 } __attribute__((__packed__));
76 struct uhid_get_report_req {
80 } __attribute__((__packed__));
82 struct uhid_get_report_reply_req {
86 __u8 data[UHID_DATA_MAX];
87 } __attribute__((__packed__));
89 struct uhid_set_report_req {
94 __u8 data[UHID_DATA_MAX];
95 } __attribute__((__packed__));
97 struct uhid_set_report_reply_req {
100 } __attribute__((__packed__));
104 * All these commands and requests are obsolete. You should avoid using them in
105 * new code. We support them for backwards-compatibility, but you might not get
106 * access to new feature in case you use them.
109 enum uhid_legacy_event_type {
110 UHID_CREATE = __UHID_LEGACY_CREATE,
111 UHID_OUTPUT_EV = __UHID_LEGACY_OUTPUT_EV,
112 UHID_INPUT = __UHID_LEGACY_INPUT,
113 UHID_FEATURE = UHID_GET_REPORT,
114 UHID_FEATURE_ANSWER = UHID_GET_REPORT_REPLY,
117 /* Obsolete! Use UHID_CREATE2. */
118 struct uhid_create_req {
122 __u8 __user *rd_data;
130 } __attribute__((__packed__));
132 /* Obsolete! Use UHID_INPUT2. */
133 struct uhid_input_req {
134 __u8 data[UHID_DATA_MAX];
136 } __attribute__((__packed__));
138 /* Obsolete! Kernel uses UHID_OUTPUT exclusively now. */
139 struct uhid_output_ev_req {
143 } __attribute__((__packed__));
145 /* Obsolete! Kernel uses ABI compatible UHID_GET_REPORT. */
146 struct uhid_feature_req {
150 } __attribute__((__packed__));
152 /* Obsolete! Use ABI compatible UHID_GET_REPORT_REPLY. */
153 struct uhid_feature_answer_req {
157 __u8 data[UHID_DATA_MAX];
158 } __attribute__((__packed__));
162 * All UHID events from and to the kernel are encoded as "struct uhid_event".
163 * The "type" field contains a UHID_* type identifier. All payload depends on
164 * that type and can be accessed via ev->u.XYZ accordingly.
165 * If user-space writes short events, they're extended with 0s by the kernel. If
166 * the kernel writes short events, user-space shall extend them with 0s.
173 struct uhid_create_req create;
174 struct uhid_input_req input;
175 struct uhid_output_req output;
176 struct uhid_output_ev_req output_ev;
177 struct uhid_feature_req feature;
178 struct uhid_get_report_req get_report;
179 struct uhid_feature_answer_req feature_answer;
180 struct uhid_get_report_reply_req get_report_reply;
181 struct uhid_create2_req create2;
182 struct uhid_input2_req input2;
183 struct uhid_set_report_req set_report;
184 struct uhid_set_report_reply_req set_report_reply;
186 } __attribute__((__packed__));
188 #endif /* __UHID_H_ */