LXR qemu/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
  33typedef 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
  43static 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
  63static 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
  97static 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
 122static 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
 130static 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
 136static void msmouse_chr_free(struct CharDriverState *chr)
 137{
 138    MouseState *mouse = chr->opaque;
 139
 140    qemu_input_handler_unregister(mouse->hs);
 141    g_free(mouse);
 142}
 143
 144static QemuInputHandler msmouse_handler = {
 145    .name  = "QEMU Microsoft Mouse",
 146    .mask  = INPUT_EVENT_MASK_BTN | INPUT_EVENT_MASK_REL,
 147    .event = msmouse_input_event,
 148    .sync  = msmouse_input_sync,
 149};
 150
 151static CharDriverState *qemu_chr_open_msmouse(const char *id,
 152                                              ChardevBackend *backend,
 153                                              ChardevReturn *ret,
 154                                              bool *be_opened,
 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    if (!chr) {
 163        return NULL;
 164    }
 165    chr->chr_write = msmouse_chr_write;
 166    chr->chr_free = msmouse_chr_free;
 167    chr->chr_accept_input = msmouse_chr_accept_input;
 168    *be_opened = false;
 169
 170    mouse = g_new0(MouseState, 1);
 171    mouse->hs = qemu_input_handler_register((DeviceState *)mouse,
 172                                            &msmouse_handler);
 173
 174    mouse->chr = chr;
 175    chr->opaque = mouse;
 176
 177    return chr;
 178}
 179
 180static void register_types(void)
 181{
 182    register_char_driver("msmouse", CHARDEV_BACKEND_KIND_MSMOUSE, NULL,
 183                         qemu_chr_open_msmouse);
 184}
 185
 186type_init(register_types);
 187