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     Chardev parent;
  35
  36     QemuInputHandlerState *hs;
  37     int axis[INPUT_AXIS__MAX];
  38     bool btns[INPUT_BUTTON__MAX];
  39     bool btnc[INPUT_BUTTON__MAX];
  40     uint8_t outbuf[32];
  41     int outlen;
  42 } MouseChardev;
  43
  44 #define TYPE_CHARDEV_MSMOUSE "chardev-msmouse"
  45 #define MOUSE_CHARDEV(obj)                                      \
  46     OBJECT_CHECK(MouseChardev, (obj), TYPE_CHARDEV_MSMOUSE)
  47
  48 static void msmouse_chr_accept_input(Chardev *chr)
  49 {
  50     MouseChardev *mouse = MOUSE_CHARDEV(chr);
  51     int len;
  52
  53     len = qemu_chr_be_can_write(chr);
  54     if (len > mouse->outlen) {
  55         len = mouse->outlen;
  56     }
  57     if (!len) {
  58         return;
  59     }
  60
  61     qemu_chr_be_write(chr, mouse->outbuf, len);
  62     mouse->outlen -= len;
  63     if (mouse->outlen) {
  64         memmove(mouse->outbuf, mouse->outbuf + len, mouse->outlen);
  65     }
  66 }
  67
  68 static void msmouse_queue_event(MouseChardev *mouse)
  69 {
  70     unsigned char bytes[4] = { 0x40, 0x00, 0x00, 0x00 };
  71     int dx, dy, count = 3;
  72
  73     dx = mouse->axis[INPUT_AXIS_X];
  74     mouse->axis[INPUT_AXIS_X] = 0;
  75
  76     dy = mouse->axis[INPUT_AXIS_Y];
  77     mouse->axis[INPUT_AXIS_Y] = 0;
  78
  79     /* Movement deltas */
  80     bytes[0] |= (MSMOUSE_HI2(dy) << 2) | MSMOUSE_HI2(dx);
  81     bytes[1] |= MSMOUSE_LO6(dx);
  82     bytes[2] |= MSMOUSE_LO6(dy);
  83
  84     /* Buttons */
  85     bytes[0] |= (mouse->btns[INPUT_BUTTON_LEFT]   ? 0x20 : 0x00);
  86     bytes[0] |= (mouse->btns[INPUT_BUTTON_RIGHT]  ? 0x10 : 0x00);
  87     if (mouse->btns[INPUT_BUTTON_MIDDLE] ||
  88         mouse->btnc[INPUT_BUTTON_MIDDLE]) {
  89         bytes[3] |= (mouse->btns[INPUT_BUTTON_MIDDLE] ? 0x20 : 0x00);
  90         mouse->btnc[INPUT_BUTTON_MIDDLE] = false;
  91         count = 4;
  92     }
  93
  94     if (mouse->outlen <= sizeof(mouse->outbuf) - count) {
  95         memcpy(mouse->outbuf + mouse->outlen, bytes, count);
  96         mouse->outlen += count;
  97     } else {
  98         /* queue full -> drop event */
  99     }
 100 }
 101
 102 static void msmouse_input_event(DeviceState *dev, QemuConsole *src,
 103                                 InputEvent *evt)
 104 {
 105     MouseChardev *mouse = MOUSE_CHARDEV(dev);
 106     InputMoveEvent *move;
 107     InputBtnEvent *btn;
 108
 109     switch (evt->type) {
 110     case INPUT_EVENT_KIND_REL:
 111         move = evt->u.rel.data;
 112         mouse->axis[move->axis] += move->value;
 113         break;
 114
 115     case INPUT_EVENT_KIND_BTN:
 116         btn = evt->u.btn.data;
 117         mouse->btns[btn->button] = btn->down;
 118         mouse->btnc[btn->button] = true;
 119         break;
 120
 121     default:
 122         /* keep gcc happy */
 123         break;
 124     }
 125 }
 126
 127 static void msmouse_input_sync(DeviceState *dev)
 128 {
 129     MouseChardev *mouse = MOUSE_CHARDEV(dev);
 130     Chardev *chr = CHARDEV(dev);
 131
 132     msmouse_queue_event(mouse);
 133     msmouse_chr_accept_input(chr);
 134 }
 135
 136 static int msmouse_chr_write(struct Chardev *s, const uint8_t *buf, int len)
 137 {
 138     /* Ignore writes to mouse port */
 139     return len;
 140 }
 141
 142 static void char_msmouse_finalize(Object *obj)
 143 {
 144     MouseChardev *mouse = MOUSE_CHARDEV(obj);
 145
 146     qemu_input_handler_unregister(mouse->hs);
 147 }
 148
 149 static QemuInputHandler msmouse_handler = {
 150     .name  = "QEMU Microsoft Mouse",
 151     .mask  = INPUT_EVENT_MASK_BTN | INPUT_EVENT_MASK_REL,
 152     .event = msmouse_input_event,
 153     .sync  = msmouse_input_sync,
 154 };
 155
 156 static void msmouse_chr_open(Chardev *chr,
 157                              ChardevBackend *backend,
 158                              bool *be_opened,
 159                              Error **errp)
 160 {
 161     MouseChardev *mouse = MOUSE_CHARDEV(chr);
 162
 163     *be_opened = false;
 164     mouse->hs = qemu_input_handler_register((DeviceState *)mouse,
 165                                             &msmouse_handler);
 166 }
 167
 168 static void char_msmouse_class_init(ObjectClass *oc, void *data)
 169 {
 170     ChardevClass *cc = CHARDEV_CLASS(oc);
 171
 172     cc->open = msmouse_chr_open;
 173     cc->chr_write = msmouse_chr_write;
 174     cc->chr_accept_input = msmouse_chr_accept_input;
 175 }
 176
 177 static const TypeInfo char_msmouse_type_info = {
 178     .name = TYPE_CHARDEV_MSMOUSE,
 179     .parent = TYPE_CHARDEV,
 180     .instance_size = sizeof(MouseChardev),
 181     .instance_finalize = char_msmouse_finalize,
 182     .class_init = char_msmouse_class_init,
 183 };
 184
 185 static void register_types(void)
 186 {
 187     type_register_static(&char_msmouse_type_info);
 188 }
 189
 190 type_init(register_types);