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 static void msmouse_chr_accept_input(Chardev *chr)
  45 {
  46     MouseChardev *mouse = (MouseChardev *)chr;
  47     int len;
  48
  49     len = qemu_chr_be_can_write(chr);
  50     if (len > mouse->outlen) {
  51         len = mouse->outlen;
  52     }
  53     if (!len) {
  54         return;
  55     }
  56
  57     qemu_chr_be_write(chr, mouse->outbuf, len);
  58     mouse->outlen -= len;
  59     if (mouse->outlen) {
  60         memmove(mouse->outbuf, mouse->outbuf + len, mouse->outlen);
  61     }
  62 }
  63
  64 static void msmouse_queue_event(MouseChardev *mouse)
  65 {
  66     unsigned char bytes[4] = { 0x40, 0x00, 0x00, 0x00 };
  67     int dx, dy, count = 3;
  68
  69     dx = mouse->axis[INPUT_AXIS_X];
  70     mouse->axis[INPUT_AXIS_X] = 0;
  71
  72     dy = mouse->axis[INPUT_AXIS_Y];
  73     mouse->axis[INPUT_AXIS_Y] = 0;
  74
  75     /* Movement deltas */
  76     bytes[0] |= (MSMOUSE_HI2(dy) << 2) | MSMOUSE_HI2(dx);
  77     bytes[1] |= MSMOUSE_LO6(dx);
  78     bytes[2] |= MSMOUSE_LO6(dy);
  79
  80     /* Buttons */
  81     bytes[0] |= (mouse->btns[INPUT_BUTTON_LEFT]   ? 0x20 : 0x00);
  82     bytes[0] |= (mouse->btns[INPUT_BUTTON_RIGHT]  ? 0x10 : 0x00);
  83     if (mouse->btns[INPUT_BUTTON_MIDDLE] ||
  84         mouse->btnc[INPUT_BUTTON_MIDDLE]) {
  85         bytes[3] |= (mouse->btns[INPUT_BUTTON_MIDDLE] ? 0x20 : 0x00);
  86         mouse->btnc[INPUT_BUTTON_MIDDLE] = false;
  87         count = 4;
  88     }
  89
  90     if (mouse->outlen <= sizeof(mouse->outbuf) - count) {
  91         memcpy(mouse->outbuf + mouse->outlen, bytes, count);
  92         mouse->outlen += count;
  93     } else {
  94         /* queue full -> drop event */
  95     }
  96 }
  97
  98 static void msmouse_input_event(DeviceState *dev, QemuConsole *src,
  99                                 InputEvent *evt)
 100 {
 101     MouseChardev *mouse = (MouseChardev *)dev;
 102     InputMoveEvent *move;
 103     InputBtnEvent *btn;
 104
 105     switch (evt->type) {
 106     case INPUT_EVENT_KIND_REL:
 107         move = evt->u.rel.data;
 108         mouse->axis[move->axis] += move->value;
 109         break;
 110
 111     case INPUT_EVENT_KIND_BTN:
 112         btn = evt->u.btn.data;
 113         mouse->btns[btn->button] = btn->down;
 114         mouse->btnc[btn->button] = true;
 115         break;
 116
 117     default:
 118         /* keep gcc happy */
 119         break;
 120     }
 121 }
 122
 123 static void msmouse_input_sync(DeviceState *dev)
 124 {
 125     MouseChardev *mouse = (MouseChardev *)dev;
 126     Chardev *chr = (Chardev *)dev;
 127
 128     msmouse_queue_event(mouse);
 129     msmouse_chr_accept_input(chr);
 130 }
 131
 132 static int msmouse_chr_write(struct Chardev *s, const uint8_t *buf, int len)
 133 {
 134     /* Ignore writes to mouse port */
 135     return len;
 136 }
 137
 138 static void msmouse_chr_free(struct Chardev *chr)
 139 {
 140     MouseChardev *mouse = (MouseChardev *)chr;
 141
 142     qemu_input_handler_unregister(mouse->hs);
 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 Chardev *qemu_chr_open_msmouse(const CharDriver *driver,
 153                                       const char *id,
 154                                       ChardevBackend *backend,
 155                                       ChardevReturn *ret,
 156                                       bool *be_opened,
 157                                       Error **errp)
 158 {
 159     ChardevCommon *common = backend->u.msmouse.data;
 160     MouseChardev *mouse;
 161     Chardev *chr;
 162
 163     chr = qemu_chr_alloc(driver, common, errp);
 164     if (!chr) {
 165         return NULL;
 166     }
 167     *be_opened = false;
 168
 169     mouse = (MouseChardev *)chr;
 170     mouse->hs = qemu_input_handler_register((DeviceState *)mouse,
 171                                             &msmouse_handler);
 172
 173
 174     return chr;
 175 }
 176
 177 static void register_types(void)
 178 {
 179     static const CharDriver driver = {
 180         .instance_size = sizeof(MouseChardev),
 181         .kind = CHARDEV_BACKEND_KIND_MSMOUSE,
 182         .create = qemu_chr_open_msmouse,
 183         .chr_write = msmouse_chr_write,
 184         .chr_accept_input = msmouse_chr_accept_input,
 185         .chr_free = msmouse_chr_free,
 186     };
 187     register_char_driver(&driver);
 188 }
 189
 190 type_init(register_types);