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 #include "qom/object.h"
  31
  32 #define MSMOUSE_LO6(n) ((n) & 0x3f)
  33 #define MSMOUSE_HI2(n) (((n) & 0xc0) >> 6)
  34
  35 struct MouseChardev {
  36     Chardev parent;
  37
  38     QemuInputHandlerState *hs;
  39     int axis[INPUT_AXIS__MAX];
  40     bool btns[INPUT_BUTTON__MAX];
  41     bool btnc[INPUT_BUTTON__MAX];
  42     uint8_t outbuf[32];
  43     int outlen;
  44 };
  45 typedef struct MouseChardev MouseChardev;
  46
  47 #define TYPE_CHARDEV_MSMOUSE "chardev-msmouse"
  48 DECLARE_INSTANCE_CHECKER(MouseChardev, MOUSE_CHARDEV,
  49                          TYPE_CHARDEV_MSMOUSE)
  50
  51 static void msmouse_chr_accept_input(Chardev *chr)
  52 {
  53     MouseChardev *mouse = MOUSE_CHARDEV(chr);
  54     int len;
  55
  56     len = qemu_chr_be_can_write(chr);
  57     if (len > mouse->outlen) {
  58         len = mouse->outlen;
  59     }
  60     if (!len) {
  61         return;
  62     }
  63
  64     qemu_chr_be_write(chr, mouse->outbuf, len);
  65     mouse->outlen -= len;
  66     if (mouse->outlen) {
  67         memmove(mouse->outbuf, mouse->outbuf + len, mouse->outlen);
  68     }
  69 }
  70
  71 static void msmouse_queue_event(MouseChardev *mouse)
  72 {
  73     unsigned char bytes[4] = { 0x40, 0x00, 0x00, 0x00 };
  74     int dx, dy, count = 3;
  75
  76     dx = mouse->axis[INPUT_AXIS_X];
  77     mouse->axis[INPUT_AXIS_X] = 0;
  78
  79     dy = mouse->axis[INPUT_AXIS_Y];
  80     mouse->axis[INPUT_AXIS_Y] = 0;
  81
  82     /* Movement deltas */
  83     bytes[0] |= (MSMOUSE_HI2(dy) << 2) | MSMOUSE_HI2(dx);
  84     bytes[1] |= MSMOUSE_LO6(dx);
  85     bytes[2] |= MSMOUSE_LO6(dy);
  86
  87     /* Buttons */
  88     bytes[0] |= (mouse->btns[INPUT_BUTTON_LEFT]   ? 0x20 : 0x00);
  89     bytes[0] |= (mouse->btns[INPUT_BUTTON_RIGHT]  ? 0x10 : 0x00);
  90     if (mouse->btns[INPUT_BUTTON_MIDDLE] ||
  91         mouse->btnc[INPUT_BUTTON_MIDDLE]) {
  92         bytes[3] |= (mouse->btns[INPUT_BUTTON_MIDDLE] ? 0x20 : 0x00);
  93         mouse->btnc[INPUT_BUTTON_MIDDLE] = false;
  94         count = 4;
  95     }
  96
  97     if (mouse->outlen <= sizeof(mouse->outbuf) - count) {
  98         memcpy(mouse->outbuf + mouse->outlen, bytes, count);
  99         mouse->outlen += count;
 100     } else {
 101         /* queue full -> drop event */
 102     }
 103 }
 104
 105 static void msmouse_input_event(DeviceState *dev, QemuConsole *src,
 106                                 InputEvent *evt)
 107 {
 108     MouseChardev *mouse = MOUSE_CHARDEV(dev);
 109     InputMoveEvent *move;
 110     InputBtnEvent *btn;
 111
 112     switch (evt->type) {
 113     case INPUT_EVENT_KIND_REL:
 114         move = evt->u.rel.data;
 115         mouse->axis[move->axis] += move->value;
 116         break;
 117
 118     case INPUT_EVENT_KIND_BTN:
 119         btn = evt->u.btn.data;
 120         mouse->btns[btn->button] = btn->down;
 121         mouse->btnc[btn->button] = true;
 122         break;
 123
 124     default:
 125         /* keep gcc happy */
 126         break;
 127     }
 128 }
 129
 130 static void msmouse_input_sync(DeviceState *dev)
 131 {
 132     MouseChardev *mouse = MOUSE_CHARDEV(dev);
 133     Chardev *chr = CHARDEV(dev);
 134
 135     msmouse_queue_event(mouse);
 136     msmouse_chr_accept_input(chr);
 137 }
 138
 139 static int msmouse_chr_write(struct Chardev *s, const uint8_t *buf, int len)
 140 {
 141     /* Ignore writes to mouse port */
 142     return len;
 143 }
 144
 145 static void char_msmouse_finalize(Object *obj)
 146 {
 147     MouseChardev *mouse = MOUSE_CHARDEV(obj);
 148
 149     qemu_input_handler_unregister(mouse->hs);
 150 }
 151
 152 static QemuInputHandler msmouse_handler = {
 153     .name  = "QEMU Microsoft Mouse",
 154     .mask  = INPUT_EVENT_MASK_BTN | INPUT_EVENT_MASK_REL,
 155     .event = msmouse_input_event,
 156     .sync  = msmouse_input_sync,
 157 };
 158
 159 static void msmouse_chr_open(Chardev *chr,
 160                              ChardevBackend *backend,
 161                              bool *be_opened,
 162                              Error **errp)
 163 {
 164     MouseChardev *mouse = MOUSE_CHARDEV(chr);
 165
 166     *be_opened = false;
 167     mouse->hs = qemu_input_handler_register((DeviceState *)mouse,
 168                                             &msmouse_handler);
 169 }
 170
 171 static void char_msmouse_class_init(ObjectClass *oc, void *data)
 172 {
 173     ChardevClass *cc = CHARDEV_CLASS(oc);
 174
 175     cc->open = msmouse_chr_open;
 176     cc->chr_write = msmouse_chr_write;
 177     cc->chr_accept_input = msmouse_chr_accept_input;
 178 }
 179
 180 static const TypeInfo char_msmouse_type_info = {
 181     .name = TYPE_CHARDEV_MSMOUSE,
 182     .parent = TYPE_CHARDEV,
 183     .instance_size = sizeof(MouseChardev),
 184     .instance_finalize = char_msmouse_finalize,
 185     .class_init = char_msmouse_class_init,
 186 };
 187
 188 static void register_types(void)
 189 {
 190     type_register_static(&char_msmouse_type_info);
 191 }
 192
 193 type_init(register_types);