include/xen/interface/io/kbdif.h

   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