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1/*
2 * kbdif.h -- Xen virtual keyboard/mouse
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a copy
5 * of this software and associated documentation files (the "Software"), to
6 * deal in the Software without restriction, including without limitation the
7 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
8 * sell copies of the Software, and to permit persons to whom the Software is
9 * furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
19 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
20 * DEALINGS IN THE SOFTWARE.
21 *
22 * Copyright (C) 2005 Anthony Liguori <aliguori@us.ibm.com>
23 * Copyright (C) 2006 Red Hat, Inc., Markus Armbruster <armbru@redhat.com>
24 */
25
26#ifndef __XEN_PUBLIC_IO_KBDIF_H__
27#define __XEN_PUBLIC_IO_KBDIF_H__
28
29/* In events (backend -> frontend) */
30
31/*
32 * Frontends should ignore unknown in events.
33 */
34
35/* Pointer movement event */
36#define XENKBD_TYPE_MOTION 1
37/* Event type 2 currently not used */
38/* Key event (includes pointer buttons) */
39#define XENKBD_TYPE_KEY 3
40/*
41 * Pointer position event
42 * Capable backend sets feature-abs-pointer in xenstore.
43 * Frontend requests ot instead of XENKBD_TYPE_MOTION by setting
44 * request-abs-update in xenstore.
45 */
46#define XENKBD_TYPE_POS 4
47
48struct xenkbd_motion {
49 uint8_t type; /* XENKBD_TYPE_MOTION */
50 int32_t rel_x; /* relative X motion */
51 int32_t rel_y; /* relative Y motion */
52};
53
54struct xenkbd_key {
55 uint8_t type; /* XENKBD_TYPE_KEY */
56 uint8_t pressed; /* 1 if pressed; 0 otherwise */
57 uint32_t keycode; /* KEY_* from linux/input.h */
58};
59
60struct xenkbd_position {
61 uint8_t type; /* XENKBD_TYPE_POS */
62 int32_t abs_x; /* absolute X position (in FB pixels) */
63 int32_t abs_y; /* absolute Y position (in FB pixels) */
64};
65
66#define XENKBD_IN_EVENT_SIZE 40
67
68union xenkbd_in_event {
69 uint8_t type;
70 struct xenkbd_motion motion;
71 struct xenkbd_key key;
72 struct xenkbd_position pos;
73 char pad[XENKBD_IN_EVENT_SIZE];
74};
75
76/* Out events (frontend -> backend) */
77
78/*
79 * Out events may be sent only when requested by backend, and receipt
80 * of an unknown out event is an error.
81 * No out events currently defined.
82 */
83
84#define XENKBD_OUT_EVENT_SIZE 40
85
86union xenkbd_out_event {
87 uint8_t type;
88 char pad[XENKBD_OUT_EVENT_SIZE];
89};
90
91/* shared page */
92
93#define XENKBD_IN_RING_SIZE 2048
94#define XENKBD_IN_RING_LEN (XENKBD_IN_RING_SIZE / XENKBD_IN_EVENT_SIZE)
95#define XENKBD_IN_RING_OFFS 1024
96#define XENKBD_IN_RING(page) \
97 ((union xenkbd_in_event *)((char *)(page) + XENKBD_IN_RING_OFFS))
98#define XENKBD_IN_RING_REF(page, idx) \
99 (XENKBD_IN_RING((page))[(idx) % XENKBD_IN_RING_LEN])
100
101#define XENKBD_OUT_RING_SIZE 1024
102#define XENKBD_OUT_RING_LEN (XENKBD_OUT_RING_SIZE / XENKBD_OUT_EVENT_SIZE)
103#define XENKBD_OUT_RING_OFFS (XENKBD_IN_RING_OFFS + XENKBD_IN_RING_SIZE)
104#define XENKBD_OUT_RING(page) \
105 ((union xenkbd_out_event *)((char *)(page) + XENKBD_OUT_RING_OFFS))
106#define XENKBD_OUT_RING_REF(page, idx) \
107 (XENKBD_OUT_RING((page))[(idx) % XENKBD_OUT_RING_LEN])
108
109struct xenkbd_page {
110 uint32_t in_cons, in_prod;
111 uint32_t out_cons, out_prod;
112};
113
114#endif