xref: /openbmc/linux/include/xen/interface/io/kbdif.h (revision 94cdda6b)
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 
48 struct 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 	int32_t rel_z;		/* relative Z motion (wheel) */
53 };
54 
55 struct xenkbd_key {
56 	uint8_t type;		/* XENKBD_TYPE_KEY */
57 	uint8_t pressed;	/* 1 if pressed; 0 otherwise */
58 	uint32_t keycode;	/* KEY_* from linux/input.h */
59 };
60 
61 struct xenkbd_position {
62 	uint8_t type;		/* XENKBD_TYPE_POS */
63 	int32_t abs_x;		/* absolute X position (in FB pixels) */
64 	int32_t abs_y;		/* absolute Y position (in FB pixels) */
65 	int32_t rel_z;		/* relative Z motion (wheel) */
66 };
67 
68 #define XENKBD_IN_EVENT_SIZE 40
69 
70 union xenkbd_in_event {
71 	uint8_t type;
72 	struct xenkbd_motion motion;
73 	struct xenkbd_key key;
74 	struct xenkbd_position pos;
75 	char pad[XENKBD_IN_EVENT_SIZE];
76 };
77 
78 /* Out events (frontend -> backend) */
79 
80 /*
81  * Out events may be sent only when requested by backend, and receipt
82  * of an unknown out event is an error.
83  * No out events currently defined.
84  */
85 
86 #define XENKBD_OUT_EVENT_SIZE 40
87 
88 union xenkbd_out_event {
89 	uint8_t type;
90 	char pad[XENKBD_OUT_EVENT_SIZE];
91 };
92 
93 /* shared page */
94 
95 #define XENKBD_IN_RING_SIZE 2048
96 #define XENKBD_IN_RING_LEN (XENKBD_IN_RING_SIZE / XENKBD_IN_EVENT_SIZE)
97 #define XENKBD_IN_RING_OFFS 1024
98 #define XENKBD_IN_RING(page) \
99 	((union xenkbd_in_event *)((char *)(page) + XENKBD_IN_RING_OFFS))
100 #define XENKBD_IN_RING_REF(page, idx) \
101 	(XENKBD_IN_RING((page))[(idx) % XENKBD_IN_RING_LEN])
102 
103 #define XENKBD_OUT_RING_SIZE 1024
104 #define XENKBD_OUT_RING_LEN (XENKBD_OUT_RING_SIZE / XENKBD_OUT_EVENT_SIZE)
105 #define XENKBD_OUT_RING_OFFS (XENKBD_IN_RING_OFFS + XENKBD_IN_RING_SIZE)
106 #define XENKBD_OUT_RING(page) \
107 	((union xenkbd_out_event *)((char *)(page) + XENKBD_OUT_RING_OFFS))
108 #define XENKBD_OUT_RING_REF(page, idx) \
109 	(XENKBD_OUT_RING((page))[(idx) % XENKBD_OUT_RING_LEN])
110 
111 struct xenkbd_page {
112 	uint32_t in_cons, in_prod;
113 	uint32_t out_cons, out_prod;
114 };
115 
116 #endif
117