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 "qemu/osdep.h"
  25 #include "qemu-common.h"
  26 #include "sysemu/char.h"
  27 #include "ui/console.h"
  28 #include "ui/input.h"
  29
  30 #define MSMOUSE_LO6(n) ((n) & 0x3f)
  31 #define MSMOUSE_HI2(n) (((n) & 0xc0) >> 6)
  32
  33 typedef struct {
  34     CharDriverState *chr;
  35     QemuInputHandlerState *hs;
  36     int axis[INPUT_AXIS__MAX];
  37     bool btns[INPUT_BUTTON__MAX];
  38     bool btnc[INPUT_BUTTON__MAX];
  39     uint8_t outbuf[32];
  40     int outlen;
  41 } MouseState;
  42
  43 static void msmouse_chr_accept_input(CharDriverState *chr)
  44 {
  45     MouseState *mouse = chr->opaque;
  46     int len;
  47
  48     len = qemu_chr_be_can_write(chr);
  49     if (len > mouse->outlen) {
  50         len = mouse->outlen;
  51     }
  52     if (!len) {
  53         return;
  54     }
  55
  56     qemu_chr_be_write(chr, mouse->outbuf, len);
  57     mouse->outlen -= len;
  58     if (mouse->outlen) {
  59         memmove(mouse->outbuf, mouse->outbuf + len, mouse->outlen);
  60     }
  61 }
  62
  63 static void msmouse_queue_event(MouseState *mouse)
  64 {
  65     unsigned char bytes[4] = { 0x40, 0x00, 0x00, 0x00 };
  66     int dx, dy, count = 3;
  67
  68     dx = mouse->axis[INPUT_AXIS_X];
  69     mouse->axis[INPUT_AXIS_X] = 0;
  70
  71     dy = mouse->axis[INPUT_AXIS_Y];
  72     mouse->axis[INPUT_AXIS_Y] = 0;
  73
  74     /* Movement deltas */
  75     bytes[0] |= (MSMOUSE_HI2(dy) << 2) | MSMOUSE_HI2(dx);
  76     bytes[1] |= MSMOUSE_LO6(dx);
  77     bytes[2] |= MSMOUSE_LO6(dy);
  78
  79     /* Buttons */
  80     bytes[0] |= (mouse->btns[INPUT_BUTTON_LEFT]   ? 0x20 : 0x00);
  81     bytes[0] |= (mouse->btns[INPUT_BUTTON_RIGHT]  ? 0x10 : 0x00);
  82     if (mouse->btns[INPUT_BUTTON_MIDDLE] ||
  83         mouse->btnc[INPUT_BUTTON_MIDDLE]) {
  84         bytes[3] |= (mouse->btns[INPUT_BUTTON_MIDDLE] ? 0x20 : 0x00);
  85         mouse->btnc[INPUT_BUTTON_MIDDLE] = false;
  86         count = 4;
  87     }
  88
  89     if (mouse->outlen <= sizeof(mouse->outbuf) - count) {
  90         memcpy(mouse->outbuf + mouse->outlen, bytes, count);
  91         mouse->outlen += count;
  92     } else {
  93         /* queue full -> drop event */
  94     }
  95 }
  96
  97 static void msmouse_input_event(DeviceState *dev, QemuConsole *src,
  98                                 InputEvent *evt)
  99 {
 100     MouseState *mouse = (MouseState *)dev;
 101     InputMoveEvent *move;
 102     InputBtnEvent *btn;
 103
 104     switch (evt->type) {
 105     case INPUT_EVENT_KIND_REL:
 106         move = evt->u.rel.data;
 107         mouse->axis[move->axis] += move->value;
 108         break;
 109
 110     case INPUT_EVENT_KIND_BTN:
 111         btn = evt->u.btn.data;
 112         mouse->btns[btn->button] = btn->down;
 113         mouse->btnc[btn->button] = true;
 114         break;
 115
 116     default:
 117         /* keep gcc happy */
 118         break;
 119     }
 120 }
 121
 122 static void msmouse_input_sync(DeviceState *dev)
 123 {
 124     MouseState *mouse = (MouseState *)dev;
 125
 126     msmouse_queue_event(mouse);
 127     msmouse_chr_accept_input(mouse->chr);
 128 }
 129
 130 static int msmouse_chr_write (struct CharDriverState *s, const uint8_t *buf, int len)
 131 {
 132     /* Ignore writes to mouse port */
 133     return len;
 134 }
 135
 136 static void msmouse_chr_close (struct CharDriverState *chr)
 137 {
 138     MouseState *mouse = chr->opaque;
 139
 140     qemu_input_handler_unregister(mouse->hs);
 141     g_free(mouse);
 142     g_free(chr);
 143 }
 144
 145 static QemuInputHandler msmouse_handler = {
 146     .name  = "QEMU Microsoft Mouse",
 147     .mask  = INPUT_EVENT_MASK_BTN | INPUT_EVENT_MASK_REL,
 148     .event = msmouse_input_event,
 149     .sync  = msmouse_input_sync,
 150 };
 151
 152 static CharDriverState *qemu_chr_open_msmouse(const char *id,
 153                                               ChardevBackend *backend,
 154                                               ChardevReturn *ret,
 155                                               Error **errp)
 156 {
 157     ChardevCommon *common = backend->u.msmouse.data;
 158     MouseState *mouse;
 159     CharDriverState *chr;
 160
 161     chr = qemu_chr_alloc(common, errp);
 162     chr->chr_write = msmouse_chr_write;
 163     chr->chr_close = msmouse_chr_close;
 164     chr->chr_accept_input = msmouse_chr_accept_input;
 165     chr->explicit_be_open = true;
 166
 167     mouse = g_new0(MouseState, 1);
 168     mouse->hs = qemu_input_handler_register((DeviceState *)mouse,
 169                                             &msmouse_handler);
 170
 171     mouse->chr = chr;
 172     chr->opaque = mouse;
 173
 174     return chr;
 175 }
 176
 177 static void register_types(void)
 178 {
 179     register_char_driver("msmouse", CHARDEV_BACKEND_KIND_MSMOUSE, NULL,
 180                          qemu_chr_open_msmouse);
 181 }
 182
 183 type_init(register_types);