backends/msmouse.c

   1 /*
   2  * QEMU Microsoft serial mouse emulation
   3  *
   4  * Copyright (c) 2008 Lubomir Rintel
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #include <stdlib.h>
  25 #include "qemu-common.h"
  26 #include "sysemu/char.h"
  27 #include "ui/console.h"
  28
  29 #define MSMOUSE_LO6(n) ((n) & 0x3f)
  30 #define MSMOUSE_HI2(n) (((n) & 0xc0) >> 6)
  31
  32 static void msmouse_event(void *opaque,
  33                           int dx, int dy, int dz, int buttons_state)
  34 {
  35     CharDriverState *chr = (CharDriverState *)opaque;
  36
  37     unsigned char bytes[4] = { 0x40, 0x00, 0x00, 0x00 };
  38
  39     /* Movement deltas */
  40     bytes[0] |= (MSMOUSE_HI2(dy) << 2) | MSMOUSE_HI2(dx);
  41     bytes[1] |= MSMOUSE_LO6(dx);
  42     bytes[2] |= MSMOUSE_LO6(dy);
  43
  44     /* Buttons */
  45     bytes[0] |= (buttons_state & 0x01 ? 0x20 : 0x00);
  46     bytes[0] |= (buttons_state & 0x02 ? 0x10 : 0x00);
  47     bytes[3] |= (buttons_state & 0x04 ? 0x20 : 0x00);
  48
  49     /* We always send the packet of, so that we do not have to keep track
  50        of previous state of the middle button. This can potentially confuse
  51        some very old drivers for two button mice though. */
  52     qemu_chr_be_write(chr, bytes, 4);
  53 }
  54
  55 static int msmouse_chr_write (struct CharDriverState *s, const uint8_t *buf, int len)
  56 {
  57     /* Ignore writes to mouse port */
  58     return len;
  59 }
  60
  61 static void msmouse_chr_close (struct CharDriverState *chr)
  62 {
  63     g_free (chr);
  64 }
  65
  66 CharDriverState *qemu_chr_open_msmouse(void)
  67 {
  68     CharDriverState *chr;
  69
  70     chr = qemu_chr_alloc();
  71     chr->chr_write = msmouse_chr_write;
  72     chr->chr_close = msmouse_chr_close;
  73     chr->explicit_be_open = true;
  74
  75     qemu_add_mouse_event_handler(msmouse_event, chr, 0, "QEMU Microsoft Mouse");
  76
  77     return chr;
  78 }
  79
  80 static void register_types(void)
  81 {
  82     register_char_driver_qapi("msmouse", CHARDEV_BACKEND_KIND_MSMOUSE, NULL);
  83 }
  84
  85 type_init(register_types);