chardev/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
  25 #include "qemu/osdep.h"
  26 #include "qemu/module.h"
  27 #include "chardev/char.h"
  28 #include "ui/console.h"
  29 #include "ui/input.h"
  30
  31 #define MSMOUSE_LO6(n) ((n) & 0x3f)
  32 #define MSMOUSE_HI2(n) (((n) & 0xc0) >> 6)
  33
  34 typedef struct {
  35     Chardev parent;
  36
  37     QemuInputHandlerState *hs;
  38     int axis[INPUT_AXIS__MAX];
  39     bool btns[INPUT_BUTTON__MAX];
  40     bool btnc[INPUT_BUTTON__MAX];
  41     uint8_t outbuf[32];
  42     int outlen;
  43 } MouseChardev;
  44
  45 #define TYPE_CHARDEV_MSMOUSE "chardev-msmouse"
  46 #define MOUSE_CHARDEV(obj)                                      \
  47     OBJECT_CHECK(MouseChardev, (obj), TYPE_CHARDEV_MSMOUSE)
  48
  49 static void msmouse_chr_accept_input(Chardev *chr)
  50 {
  51     MouseChardev *mouse = MOUSE_CHARDEV(chr);
  52     int len;
  53
  54     len = qemu_chr_be_can_write(chr);
  55     if (len > mouse->outlen) {
  56         len = mouse->outlen;
  57     }
  58     if (!len) {
  59         return;
  60     }
  61
  62     qemu_chr_be_write(chr, mouse->outbuf, len);
  63     mouse->outlen -= len;
  64     if (mouse->outlen) {
  65         memmove(mouse->outbuf, mouse->outbuf + len, mouse->outlen);
  66     }
  67 }
  68
  69 static void msmouse_queue_event(MouseChardev *mouse)
  70 {
  71     unsigned char bytes[4] = { 0x40, 0x00, 0x00, 0x00 };
  72     int dx, dy, count = 3;
  73
  74     dx = mouse->axis[INPUT_AXIS_X];
  75     mouse->axis[INPUT_AXIS_X] = 0;
  76
  77     dy = mouse->axis[INPUT_AXIS_Y];
  78     mouse->axis[INPUT_AXIS_Y] = 0;
  79
  80     /* Movement deltas */
  81     bytes[0] |= (MSMOUSE_HI2(dy) << 2) | MSMOUSE_HI2(dx);
  82     bytes[1] |= MSMOUSE_LO6(dx);
  83     bytes[2] |= MSMOUSE_LO6(dy);
  84
  85     /* Buttons */
  86     bytes[0] |= (mouse->btns[INPUT_BUTTON_LEFT]   ? 0x20 : 0x00);
  87     bytes[0] |= (mouse->btns[INPUT_BUTTON_RIGHT]  ? 0x10 : 0x00);
  88     if (mouse->btns[INPUT_BUTTON_MIDDLE] ||
  89         mouse->btnc[INPUT_BUTTON_MIDDLE]) {
  90         bytes[3] |= (mouse->btns[INPUT_BUTTON_MIDDLE] ? 0x20 : 0x00);
  91         mouse->btnc[INPUT_BUTTON_MIDDLE] = false;
  92         count = 4;
  93     }
  94
  95     if (mouse->outlen <= sizeof(mouse->outbuf) - count) {
  96         memcpy(mouse->outbuf + mouse->outlen, bytes, count);
  97         mouse->outlen += count;
  98     } else {
  99         /* queue full -> drop event */
 100     }
 101 }
 102
 103 static void msmouse_input_event(DeviceState *dev, QemuConsole *src,
 104                                 InputEvent *evt)
 105 {
 106     MouseChardev *mouse = MOUSE_CHARDEV(dev);
 107     InputMoveEvent *move;
 108     InputBtnEvent *btn;
 109
 110     switch (evt->type) {
 111     case INPUT_EVENT_KIND_REL:
 112         move = evt->u.rel.data;
 113         mouse->axis[move->axis] += move->value;
 114         break;
 115
 116     case INPUT_EVENT_KIND_BTN:
 117         btn = evt->u.btn.data;
 118         mouse->btns[btn->button] = btn->down;
 119         mouse->btnc[btn->button] = true;
 120         break;
 121
 122     default:
 123         /* keep gcc happy */
 124         break;
 125     }
 126 }
 127
 128 static void msmouse_input_sync(DeviceState *dev)
 129 {
 130     MouseChardev *mouse = MOUSE_CHARDEV(dev);
 131     Chardev *chr = CHARDEV(dev);
 132
 133     msmouse_queue_event(mouse);
 134     msmouse_chr_accept_input(chr);
 135 }
 136
 137 static int msmouse_chr_write(struct Chardev *s, const uint8_t *buf, int len)
 138 {
 139     /* Ignore writes to mouse port */
 140     return len;
 141 }
 142
 143 static void char_msmouse_finalize(Object *obj)
 144 {
 145     MouseChardev *mouse = MOUSE_CHARDEV(obj);
 146
 147     qemu_input_handler_unregister(mouse->hs);
 148 }
 149
 150 static QemuInputHandler msmouse_handler = {
 151     .name  = "QEMU Microsoft Mouse",
 152     .mask  = INPUT_EVENT_MASK_BTN | INPUT_EVENT_MASK_REL,
 153     .event = msmouse_input_event,
 154     .sync  = msmouse_input_sync,
 155 };
 156
 157 static void msmouse_chr_open(Chardev *chr,
 158                              ChardevBackend *backend,
 159                              bool *be_opened,
 160                              Error **errp)
 161 {
 162     MouseChardev *mouse = MOUSE_CHARDEV(chr);
 163
 164     *be_opened = false;
 165     mouse->hs = qemu_input_handler_register((DeviceState *)mouse,
 166                                             &msmouse_handler);
 167 }
 168
 169 static void char_msmouse_class_init(ObjectClass *oc, void *data)
 170 {
 171     ChardevClass *cc = CHARDEV_CLASS(oc);
 172
 173     cc->open = msmouse_chr_open;
 174     cc->chr_write = msmouse_chr_write;
 175     cc->chr_accept_input = msmouse_chr_accept_input;
 176 }
 177
 178 static const TypeInfo char_msmouse_type_info = {
 179     .name = TYPE_CHARDEV_MSMOUSE,
 180     .parent = TYPE_CHARDEV,
 181     .instance_size = sizeof(MouseChardev),
 182     .instance_finalize = char_msmouse_finalize,
 183     .class_init = char_msmouse_class_init,
 184 };
 185
 186 static void register_types(void)
 187 {
 188     type_register_static(&char_msmouse_type_info);
 189 }
 190
 191 type_init(register_types);