ui/dbus-console.c

   1 /*
   2  * QEMU DBus display console
   3  *
   4  * Copyright (c) 2021 Marc-André Lureau <marcandre.lureau@redhat.com>
   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/error-report.h"
  26 #include "qapi/error.h"
  27 #include "ui/input.h"
  28 #include "ui/kbd-state.h"
  29 #include "trace.h"
  30
  31 #ifdef G_OS_UNIX
  32 #include <gio/gunixfdlist.h>
  33 #endif
  34
  35 #include "dbus.h"
  36
  37 static struct touch_slot touch_slots[INPUT_EVENT_SLOTS_MAX];
  38
  39 struct _DBusDisplayConsole {
  40     GDBusObjectSkeleton parent_instance;
  41     DisplayChangeListener dcl;
  42
  43     DBusDisplay *display;
  44     GPtrArray *listeners;
  45     QemuDBusDisplay1Console *iface;
  46
  47     QemuDBusDisplay1Keyboard *iface_kbd;
  48     QKbdState *kbd;
  49
  50     QemuDBusDisplay1Mouse *iface_mouse;
  51     QemuDBusDisplay1MultiTouch *iface_touch;
  52     gboolean last_set;
  53     guint last_x;
  54     guint last_y;
  55     Notifier mouse_mode_notifier;
  56 };
  57
  58 G_DEFINE_TYPE(DBusDisplayConsole,
  59               dbus_display_console,
  60               G_TYPE_DBUS_OBJECT_SKELETON)
  61
  62 static void
  63 dbus_display_console_set_size(DBusDisplayConsole *ddc,
  64                               uint32_t width, uint32_t height)
  65 {
  66     g_object_set(ddc->iface,
  67                  "width", width,
  68                  "height", height,
  69                  NULL);
  70 }
  71
  72 static void
  73 dbus_gfx_switch(DisplayChangeListener *dcl,
  74                 struct DisplaySurface *new_surface)
  75 {
  76     DBusDisplayConsole *ddc = container_of(dcl, DBusDisplayConsole, dcl);
  77
  78     dbus_display_console_set_size(ddc,
  79                                   surface_width(new_surface),
  80                                   surface_height(new_surface));
  81 }
  82
  83 static void
  84 dbus_gfx_update(DisplayChangeListener *dcl,
  85                 int x, int y, int w, int h)
  86 {
  87 }
  88
  89 static void
  90 dbus_gl_scanout_disable(DisplayChangeListener *dcl)
  91 {
  92 }
  93
  94 static void
  95 dbus_gl_scanout_texture(DisplayChangeListener *dcl,
  96                         uint32_t tex_id,
  97                         bool backing_y_0_top,
  98                         uint32_t backing_width,
  99                         uint32_t backing_height,
 100                         uint32_t x, uint32_t y,
 101                         uint32_t w, uint32_t h,
 102                         void *d3d_tex2d)
 103 {
 104     DBusDisplayConsole *ddc = container_of(dcl, DBusDisplayConsole, dcl);
 105
 106     dbus_display_console_set_size(ddc, w, h);
 107 }
 108
 109 static void
 110 dbus_gl_scanout_dmabuf(DisplayChangeListener *dcl,
 111                        QemuDmaBuf *dmabuf)
 112 {
 113     uint32_t width, height;
 114
 115     DBusDisplayConsole *ddc = container_of(dcl, DBusDisplayConsole, dcl);
 116
 117     width = qemu_dmabuf_get_width(dmabuf);
 118     height = qemu_dmabuf_get_height(dmabuf);
 119
 120     dbus_display_console_set_size(ddc, width, height);
 121 }
 122
 123 static void
 124 dbus_gl_scanout_update(DisplayChangeListener *dcl,
 125                        uint32_t x, uint32_t y,
 126                        uint32_t w, uint32_t h)
 127 {
 128 }
 129
 130 const DisplayChangeListenerOps dbus_console_dcl_ops = {
 131     .dpy_name                = "dbus-console",
 132     .dpy_gfx_switch          = dbus_gfx_switch,
 133     .dpy_gfx_update          = dbus_gfx_update,
 134     .dpy_gl_scanout_disable  = dbus_gl_scanout_disable,
 135     .dpy_gl_scanout_texture  = dbus_gl_scanout_texture,
 136     .dpy_gl_scanout_dmabuf   = dbus_gl_scanout_dmabuf,
 137     .dpy_gl_update           = dbus_gl_scanout_update,
 138 };
 139
 140 static void
 141 dbus_display_console_init(DBusDisplayConsole *object)
 142 {
 143     DBusDisplayConsole *ddc = DBUS_DISPLAY_CONSOLE(object);
 144
 145     ddc->listeners = g_ptr_array_new_with_free_func(g_object_unref);
 146     ddc->dcl.ops = &dbus_console_dcl_ops;
 147 }
 148
 149 static void
 150 dbus_display_console_dispose(GObject *object)
 151 {
 152     DBusDisplayConsole *ddc = DBUS_DISPLAY_CONSOLE(object);
 153
 154     unregister_displaychangelistener(&ddc->dcl);
 155     g_clear_object(&ddc->iface_touch);
 156     g_clear_object(&ddc->iface_mouse);
 157     g_clear_object(&ddc->iface_kbd);
 158     g_clear_object(&ddc->iface);
 159     g_clear_pointer(&ddc->listeners, g_ptr_array_unref);
 160     g_clear_pointer(&ddc->kbd, qkbd_state_free);
 161
 162     G_OBJECT_CLASS(dbus_display_console_parent_class)->dispose(object);
 163 }
 164
 165 static void
 166 dbus_display_console_class_init(DBusDisplayConsoleClass *klass)
 167 {
 168     GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
 169
 170     gobject_class->dispose = dbus_display_console_dispose;
 171 }
 172
 173 static void
 174 listener_vanished_cb(DBusDisplayListener *listener)
 175 {
 176     DBusDisplayConsole *ddc = dbus_display_listener_get_console(listener);
 177     const char *name = dbus_display_listener_get_bus_name(listener);
 178
 179     trace_dbus_listener_vanished(name);
 180
 181     g_ptr_array_remove_fast(ddc->listeners, listener);
 182     qkbd_state_lift_all_keys(ddc->kbd);
 183 }
 184
 185 static gboolean
 186 dbus_console_set_ui_info(DBusDisplayConsole *ddc,
 187                          GDBusMethodInvocation *invocation,
 188                          guint16 arg_width_mm,
 189                          guint16 arg_height_mm,
 190                          gint arg_xoff,
 191                          gint arg_yoff,
 192                          guint arg_width,
 193                          guint arg_height)
 194 {
 195     QemuUIInfo info = {
 196         .width_mm = arg_width_mm,
 197         .height_mm = arg_height_mm,
 198         .xoff = arg_xoff,
 199         .yoff = arg_yoff,
 200         .width = arg_width,
 201         .height = arg_height,
 202     };
 203
 204     if (!dpy_ui_info_supported(ddc->dcl.con)) {
 205         g_dbus_method_invocation_return_error(invocation,
 206                                               DBUS_DISPLAY_ERROR,
 207                                               DBUS_DISPLAY_ERROR_UNSUPPORTED,
 208                                               "SetUIInfo is not supported");
 209         return DBUS_METHOD_INVOCATION_HANDLED;
 210     }
 211
 212     dpy_set_ui_info(ddc->dcl.con, &info, false);
 213     qemu_dbus_display1_console_complete_set_uiinfo(ddc->iface, invocation);
 214     return DBUS_METHOD_INVOCATION_HANDLED;
 215 }
 216
 217 #ifdef G_OS_WIN32
 218 bool
 219 dbus_win32_import_socket(GDBusMethodInvocation *invocation,
 220                          GVariant *arg_listener, int *socket)
 221 {
 222     gsize n;
 223     WSAPROTOCOL_INFOW *info = (void *)g_variant_get_fixed_array(arg_listener, &n, 1);
 224
 225     if (!info || n != sizeof(*info)) {
 226         g_dbus_method_invocation_return_error(
 227             invocation,
 228             DBUS_DISPLAY_ERROR,
 229             DBUS_DISPLAY_ERROR_FAILED,
 230             "Failed to get socket infos");
 231         return false;
 232     }
 233
 234     *socket = WSASocketW(FROM_PROTOCOL_INFO,
 235                          FROM_PROTOCOL_INFO,
 236                          FROM_PROTOCOL_INFO,
 237                          info, 0, 0);
 238     if (*socket == INVALID_SOCKET) {
 239         g_autofree gchar *emsg = g_win32_error_message(WSAGetLastError());
 240         g_dbus_method_invocation_return_error(
 241             invocation,
 242             DBUS_DISPLAY_ERROR,
 243             DBUS_DISPLAY_ERROR_FAILED,
 244             "Couldn't create socket: %s", emsg);
 245         return false;
 246     }
 247
 248     return true;
 249 }
 250 #endif
 251
 252 static gboolean
 253 dbus_console_register_listener(DBusDisplayConsole *ddc,
 254                                GDBusMethodInvocation *invocation,
 255 #ifdef G_OS_UNIX
 256                                GUnixFDList *fd_list,
 257 #endif
 258                                GVariant *arg_listener)
 259 {
 260     const char *sender = g_dbus_method_invocation_get_sender(invocation);
 261     GDBusConnection *listener_conn;
 262     g_autoptr(GError) err = NULL;
 263     g_autoptr(GSocket) socket = NULL;
 264     g_autoptr(GSocketConnection) socket_conn = NULL;
 265     g_autofree char *guid = g_dbus_generate_guid();
 266     DBusDisplayListener *listener;
 267     int fd;
 268
 269 #ifdef G_OS_WIN32
 270     if (!dbus_win32_import_socket(invocation, arg_listener, &fd)) {
 271         return DBUS_METHOD_INVOCATION_HANDLED;
 272     }
 273 #else
 274     fd = g_unix_fd_list_get(fd_list, g_variant_get_handle(arg_listener), &err);
 275     if (err) {
 276         g_dbus_method_invocation_return_error(
 277             invocation,
 278             DBUS_DISPLAY_ERROR,
 279             DBUS_DISPLAY_ERROR_FAILED,
 280             "Couldn't get peer fd: %s", err->message);
 281         return DBUS_METHOD_INVOCATION_HANDLED;
 282     }
 283 #endif
 284
 285     socket = g_socket_new_from_fd(fd, &err);
 286     if (err) {
 287         g_dbus_method_invocation_return_error(
 288             invocation,
 289             DBUS_DISPLAY_ERROR,
 290             DBUS_DISPLAY_ERROR_FAILED,
 291             "Couldn't make a socket: %s", err->message);
 292 #ifdef G_OS_WIN32
 293         closesocket(fd);
 294 #else
 295         close(fd);
 296 #endif
 297         return DBUS_METHOD_INVOCATION_HANDLED;
 298     }
 299     socket_conn = g_socket_connection_factory_create_connection(socket);
 300
 301     qemu_dbus_display1_console_complete_register_listener(
 302         ddc->iface, invocation
 303 #ifdef G_OS_UNIX
 304         , NULL
 305 #endif
 306     );
 307
 308     listener_conn = g_dbus_connection_new_sync(
 309         G_IO_STREAM(socket_conn),
 310         guid,
 311         G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER,
 312         NULL, NULL, &err);
 313     if (err) {
 314         error_report("Failed to setup peer connection: %s", err->message);
 315         return DBUS_METHOD_INVOCATION_HANDLED;
 316     }
 317
 318     listener = dbus_display_listener_new(sender, listener_conn, ddc);
 319     if (!listener) {
 320         return DBUS_METHOD_INVOCATION_HANDLED;
 321     }
 322
 323     g_ptr_array_add(ddc->listeners, listener);
 324     g_object_connect(listener_conn,
 325                      "swapped-signal::closed", listener_vanished_cb, listener,
 326                      NULL);
 327
 328     trace_dbus_registered_listener(sender);
 329     return DBUS_METHOD_INVOCATION_HANDLED;
 330 }
 331
 332 static gboolean
 333 dbus_kbd_press(DBusDisplayConsole *ddc,
 334                GDBusMethodInvocation *invocation,
 335                guint arg_keycode)
 336 {
 337     QKeyCode qcode = qemu_input_key_number_to_qcode(arg_keycode);
 338
 339     trace_dbus_kbd_press(arg_keycode);
 340
 341     qkbd_state_key_event(ddc->kbd, qcode, true);
 342
 343     qemu_dbus_display1_keyboard_complete_press(ddc->iface_kbd, invocation);
 344
 345     return DBUS_METHOD_INVOCATION_HANDLED;
 346 }
 347
 348 static gboolean
 349 dbus_kbd_release(DBusDisplayConsole *ddc,
 350                  GDBusMethodInvocation *invocation,
 351                  guint arg_keycode)
 352 {
 353     QKeyCode qcode = qemu_input_key_number_to_qcode(arg_keycode);
 354
 355     trace_dbus_kbd_release(arg_keycode);
 356
 357     qkbd_state_key_event(ddc->kbd, qcode, false);
 358
 359     qemu_dbus_display1_keyboard_complete_release(ddc->iface_kbd, invocation);
 360
 361     return DBUS_METHOD_INVOCATION_HANDLED;
 362 }
 363
 364 static void
 365 dbus_kbd_qemu_leds_updated(void *data, int ledstate)
 366 {
 367     DBusDisplayConsole *ddc = DBUS_DISPLAY_CONSOLE(data);
 368
 369     qemu_dbus_display1_keyboard_set_modifiers(ddc->iface_kbd, ledstate);
 370 }
 371
 372 static gboolean
 373 dbus_mouse_rel_motion(DBusDisplayConsole *ddc,
 374                       GDBusMethodInvocation *invocation,
 375                       int dx, int dy)
 376 {
 377     trace_dbus_mouse_rel_motion(dx, dy);
 378
 379     if (qemu_input_is_absolute(ddc->dcl.con)) {
 380         g_dbus_method_invocation_return_error(
 381             invocation, DBUS_DISPLAY_ERROR,
 382             DBUS_DISPLAY_ERROR_INVALID,
 383             "Mouse is not relative");
 384         return DBUS_METHOD_INVOCATION_HANDLED;
 385     }
 386
 387     qemu_input_queue_rel(ddc->dcl.con, INPUT_AXIS_X, dx);
 388     qemu_input_queue_rel(ddc->dcl.con, INPUT_AXIS_Y, dy);
 389     qemu_input_event_sync();
 390
 391     qemu_dbus_display1_mouse_complete_rel_motion(ddc->iface_mouse,
 392                                                     invocation);
 393
 394     return DBUS_METHOD_INVOCATION_HANDLED;
 395 }
 396
 397 static gboolean
 398 dbus_touch_send_event(DBusDisplayConsole *ddc,
 399                       GDBusMethodInvocation *invocation,
 400                       guint kind, uint64_t num_slot,
 401                       double x, double y)
 402 {
 403     Error *error = NULL;
 404     int width, height;
 405     trace_dbus_touch_send_event(kind, num_slot, x, y);
 406
 407     if (kind != INPUT_MULTI_TOUCH_TYPE_BEGIN &&
 408         kind != INPUT_MULTI_TOUCH_TYPE_UPDATE &&
 409         kind != INPUT_MULTI_TOUCH_TYPE_CANCEL &&
 410         kind != INPUT_MULTI_TOUCH_TYPE_END)
 411     {
 412         g_dbus_method_invocation_return_error(
 413             invocation, DBUS_DISPLAY_ERROR,
 414             DBUS_DISPLAY_ERROR_INVALID,
 415             "Invalid touch event kind");
 416         return DBUS_METHOD_INVOCATION_HANDLED;
 417     }
 418     width = qemu_console_get_width(ddc->dcl.con, 0);
 419     height = qemu_console_get_height(ddc->dcl.con, 0);
 420
 421     console_handle_touch_event(ddc->dcl.con, touch_slots,
 422                                num_slot, width, height,
 423                                x, y, kind, &error);
 424     if (error != NULL) {
 425         g_dbus_method_invocation_return_error(
 426             invocation, DBUS_DISPLAY_ERROR,
 427             DBUS_DISPLAY_ERROR_INVALID,
 428             error_get_pretty(error), NULL);
 429         error_free(error);
 430     } else {
 431         qemu_dbus_display1_multi_touch_complete_send_event(ddc->iface_touch,
 432                                                            invocation);
 433     }
 434     return DBUS_METHOD_INVOCATION_HANDLED;
 435 }
 436
 437 static gboolean
 438 dbus_mouse_set_pos(DBusDisplayConsole *ddc,
 439                    GDBusMethodInvocation *invocation,
 440                    guint x, guint y)
 441 {
 442     int width, height;
 443
 444     trace_dbus_mouse_set_pos(x, y);
 445
 446     if (!qemu_input_is_absolute(ddc->dcl.con)) {
 447         g_dbus_method_invocation_return_error(
 448             invocation, DBUS_DISPLAY_ERROR,
 449             DBUS_DISPLAY_ERROR_INVALID,
 450             "Mouse is not absolute");
 451         return DBUS_METHOD_INVOCATION_HANDLED;
 452     }
 453
 454     width = qemu_console_get_width(ddc->dcl.con, 0);
 455     height = qemu_console_get_height(ddc->dcl.con, 0);
 456     if (x >= width || y >= height) {
 457         g_dbus_method_invocation_return_error(
 458             invocation, DBUS_DISPLAY_ERROR,
 459             DBUS_DISPLAY_ERROR_INVALID,
 460             "Invalid mouse position");
 461         return DBUS_METHOD_INVOCATION_HANDLED;
 462     }
 463     qemu_input_queue_abs(ddc->dcl.con, INPUT_AXIS_X, x, 0, width);
 464     qemu_input_queue_abs(ddc->dcl.con, INPUT_AXIS_Y, y, 0, height);
 465     qemu_input_event_sync();
 466
 467     qemu_dbus_display1_mouse_complete_set_abs_position(ddc->iface_mouse,
 468                                                           invocation);
 469
 470     return DBUS_METHOD_INVOCATION_HANDLED;
 471 }
 472
 473 static gboolean
 474 dbus_mouse_press(DBusDisplayConsole *ddc,
 475                  GDBusMethodInvocation *invocation,
 476                  guint button)
 477 {
 478     trace_dbus_mouse_press(button);
 479
 480     qemu_input_queue_btn(ddc->dcl.con, button, true);
 481     qemu_input_event_sync();
 482
 483     qemu_dbus_display1_mouse_complete_press(ddc->iface_mouse, invocation);
 484
 485     return DBUS_METHOD_INVOCATION_HANDLED;
 486 }
 487
 488 static gboolean
 489 dbus_mouse_release(DBusDisplayConsole *ddc,
 490                    GDBusMethodInvocation *invocation,
 491                    guint button)
 492 {
 493     trace_dbus_mouse_release(button);
 494
 495     qemu_input_queue_btn(ddc->dcl.con, button, false);
 496     qemu_input_event_sync();
 497
 498     qemu_dbus_display1_mouse_complete_release(ddc->iface_mouse, invocation);
 499
 500     return DBUS_METHOD_INVOCATION_HANDLED;
 501 }
 502
 503 static void
 504 dbus_mouse_update_is_absolute(DBusDisplayConsole *ddc)
 505 {
 506     g_object_set(ddc->iface_mouse,
 507                  "is-absolute", qemu_input_is_absolute(ddc->dcl.con),
 508                  NULL);
 509 }
 510
 511 static void
 512 dbus_mouse_mode_change(Notifier *notify, void *data)
 513 {
 514     DBusDisplayConsole *ddc =
 515         container_of(notify, DBusDisplayConsole, mouse_mode_notifier);
 516
 517     dbus_mouse_update_is_absolute(ddc);
 518 }
 519
 520 int dbus_display_console_get_index(DBusDisplayConsole *ddc)
 521 {
 522     return qemu_console_get_index(ddc->dcl.con);
 523 }
 524
 525 DBusDisplayConsole *
 526 dbus_display_console_new(DBusDisplay *display, QemuConsole *con)
 527 {
 528     g_autofree char *path = NULL;
 529     g_autofree char *label = NULL;
 530     char device_addr[256] = "";
 531     DBusDisplayConsole *ddc;
 532     int idx, i;
 533     const char *interfaces[] = {
 534         "org.qemu.Display1.Keyboard",
 535         "org.qemu.Display1.Mouse",
 536         "org.qemu.Display1.MultiTouch",
 537         NULL
 538     };
 539
 540     assert(display);
 541     assert(con);
 542
 543     label = qemu_console_get_label(con);
 544     idx = qemu_console_get_index(con);
 545     path = g_strdup_printf(DBUS_DISPLAY1_ROOT "/Console_%d", idx);
 546     ddc = g_object_new(DBUS_DISPLAY_TYPE_CONSOLE,
 547                         "g-object-path", path,
 548                         NULL);
 549     ddc->display = display;
 550     ddc->dcl.con = con;
 551     /* handle errors, and skip non graphics? */
 552     qemu_console_fill_device_address(
 553         con, device_addr, sizeof(device_addr), NULL);
 554
 555     ddc->iface = qemu_dbus_display1_console_skeleton_new();
 556     g_object_set(ddc->iface,
 557         "label", label,
 558         "type", qemu_console_is_graphic(con) ? "Graphic" : "Text",
 559         "head", qemu_console_get_head(con),
 560         "width", qemu_console_get_width(con, 0),
 561         "height", qemu_console_get_height(con, 0),
 562         "device-address", device_addr,
 563         "interfaces", interfaces,
 564         NULL);
 565     g_object_connect(ddc->iface,
 566         "swapped-signal::handle-register-listener",
 567         dbus_console_register_listener, ddc,
 568         "swapped-signal::handle-set-uiinfo",
 569         dbus_console_set_ui_info, ddc,
 570         NULL);
 571     g_dbus_object_skeleton_add_interface(G_DBUS_OBJECT_SKELETON(ddc),
 572         G_DBUS_INTERFACE_SKELETON(ddc->iface));
 573
 574     ddc->kbd = qkbd_state_init(con);
 575     ddc->iface_kbd = qemu_dbus_display1_keyboard_skeleton_new();
 576     qemu_add_led_event_handler(dbus_kbd_qemu_leds_updated, ddc);
 577     g_object_connect(ddc->iface_kbd,
 578         "swapped-signal::handle-press", dbus_kbd_press, ddc,
 579         "swapped-signal::handle-release", dbus_kbd_release, ddc,
 580         NULL);
 581     g_dbus_object_skeleton_add_interface(G_DBUS_OBJECT_SKELETON(ddc),
 582         G_DBUS_INTERFACE_SKELETON(ddc->iface_kbd));
 583
 584     ddc->iface_mouse = qemu_dbus_display1_mouse_skeleton_new();
 585     g_object_connect(ddc->iface_mouse,
 586         "swapped-signal::handle-set-abs-position", dbus_mouse_set_pos, ddc,
 587         "swapped-signal::handle-rel-motion", dbus_mouse_rel_motion, ddc,
 588         "swapped-signal::handle-press", dbus_mouse_press, ddc,
 589         "swapped-signal::handle-release", dbus_mouse_release, ddc,
 590         NULL);
 591     g_dbus_object_skeleton_add_interface(G_DBUS_OBJECT_SKELETON(ddc),
 592         G_DBUS_INTERFACE_SKELETON(ddc->iface_mouse));
 593
 594     ddc->iface_touch = qemu_dbus_display1_multi_touch_skeleton_new();
 595     g_object_connect(ddc->iface_touch,
 596         "swapped-signal::handle-send-event", dbus_touch_send_event, ddc,
 597         NULL);
 598     qemu_dbus_display1_multi_touch_set_max_slots(ddc->iface_touch,
 599                                                  INPUT_EVENT_SLOTS_MAX);
 600     g_dbus_object_skeleton_add_interface(G_DBUS_OBJECT_SKELETON(ddc),
 601         G_DBUS_INTERFACE_SKELETON(ddc->iface_touch));
 602
 603     for (i = 0; i < INPUT_EVENT_SLOTS_MAX; i++) {
 604         struct touch_slot *slot = &touch_slots[i];
 605         slot->tracking_id = -1;
 606     }
 607
 608     register_displaychangelistener(&ddc->dcl);
 609     ddc->mouse_mode_notifier.notify = dbus_mouse_mode_change;
 610     qemu_add_mouse_mode_change_notifier(&ddc->mouse_mode_notifier);
 611     dbus_mouse_update_is_absolute(ddc);
 612
 613     return ddc;
 614 }