src/evdev.c

   1 /*
   2  * Copyright © 2010 Intel Corporation
   3  *
   4  * Permission to use, copy, modify, distribute, and sell this software and
   5  * its documentation for any purpose is hereby granted without fee, provided
   6  * that the above copyright notice appear in all copies and that both that
   7  * copyright notice and this permission notice appear in supporting
   8  * documentation, and that the name of the copyright holders not be used in
   9  * advertising or publicity pertaining to distribution of the software
  10  * without specific, written prior permission.  The copyright holders make
  11  * no representations about the suitability of this software for any
  12  * purpose.  It is provided "as is" without express or implied warranty.
  13  *
  14  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
  15  * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
  16  * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
  17  * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
  18  * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
  19  * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
  20  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  21  */
  22
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <linux/input.h>
  27 #include <unistd.h>
  28 #include <fcntl.h>
  29 #include <mtdev.h>
  30
  31 #include "compositor.h"
  32 #include "evdev.h"
  33 #include "evdev-private.h"
  34 #include "launcher-util.h"
  35
  36 static inline void
  37 evdev_process_key(struct evdev_input_device *device,
  38                         struct input_event *e, int time)
  39 {
  40         if (e->value == 2)
  41                 return;
  42
  43         switch (e->code) {
  44         case BTN_TOOL_PEN:
  45         case BTN_TOOL_RUBBER:
  46         case BTN_TOOL_BRUSH:
  47         case BTN_TOOL_PENCIL:
  48         case BTN_TOOL_AIRBRUSH:
  49         case BTN_TOOL_FINGER:
  50         case BTN_TOOL_MOUSE:
  51         case BTN_TOOL_LENS:
  52                 if (device->is_touchpad)
  53                 {
  54                         device->abs.reset_x = 1;
  55                         device->abs.reset_y = 1;
  56                 }
  57                 break;
  58         case BTN_TOUCH:
  59                 /* Multitouch touchscreen devices might not send individually
  60                  * button events each time a new finger is down. So we don't
  61                  * send notification for such devices and we solve the button
  62                  * case emulating on compositor side. */
  63                 if (device->is_mt)
  64                         break;
  65
  66                 /* Treat BTN_TOUCH from devices that only have BTN_TOUCH as
  67                  * BTN_LEFT */
  68                 e->code = BTN_LEFT;
  69                 /* Intentional fallthrough! */
  70         case BTN_LEFT:
  71         case BTN_RIGHT:
  72         case BTN_MIDDLE:
  73         case BTN_SIDE:
  74         case BTN_EXTRA:
  75         case BTN_FORWARD:
  76         case BTN_BACK:
  77         case BTN_TASK:
  78                 notify_button(&device->master->base.seat,
  79                               time, e->code, e->value);
  80                 break;
  81
  82         default:
  83                 notify_key(&device->master->base.seat,
  84                            time, e->code, e->value);
  85                 break;
  86         }
  87 }
  88
  89 static void
  90 evdev_process_touch(struct evdev_input_device *device,
  91                     struct input_event *e)
  92 {
  93         const int screen_width = device->output->current->width;
  94         const int screen_height = device->output->current->height;
  95
  96         switch (e->code) {
  97         case ABS_MT_SLOT:
  98                 device->mt.slot = e->value;
  99                 break;
 100         case ABS_MT_TRACKING_ID:
 101                 if (e->value >= 0)
 102                         device->type |= EVDEV_ABSOLUTE_MT_DOWN;
 103                 else
 104                         device->type |= EVDEV_ABSOLUTE_MT_UP;
 105                 break;
 106         case ABS_MT_POSITION_X:
 107                 device->mt.x[device->mt.slot] =
 108                         (e->value - device->abs.min_x) * screen_width /
 109                         (device->abs.max_x - device->abs.min_x) +
 110                         device->output->x;
 111                 device->type |= EVDEV_ABSOLUTE_MT_MOTION;
 112                 break;
 113         case ABS_MT_POSITION_Y:
 114                 device->mt.y[device->mt.slot] =
 115                         (e->value - device->abs.min_y) * screen_height /
 116                         (device->abs.max_y - device->abs.min_y) +
 117                         device->output->y;
 118                 device->type |= EVDEV_ABSOLUTE_MT_MOTION;
 119                 break;
 120         }
 121 }
 122
 123 static inline void
 124 evdev_process_absolute_motion(struct evdev_input_device *device,
 125                               struct input_event *e)
 126 {
 127         const int screen_width = device->output->current->width;
 128         const int screen_height = device->output->current->height;
 129
 130         switch (e->code) {
 131         case ABS_X:
 132                 device->abs.x =
 133                         (e->value - device->abs.min_x) * screen_width /
 134                         (device->abs.max_x - device->abs.min_x) +
 135                         device->output->x;
 136                 device->type |= EVDEV_ABSOLUTE_MOTION;
 137                 break;
 138         case ABS_Y:
 139                 device->abs.y =
 140                         (e->value - device->abs.min_y) * screen_height /
 141                         (device->abs.max_y - device->abs.min_y) +
 142                         device->output->y;
 143                 device->type |= EVDEV_ABSOLUTE_MOTION;
 144                 break;
 145         }
 146 }
 147
 148 static inline void
 149 evdev_process_absolute_motion_touchpad(struct evdev_input_device *device,
 150                                        struct input_event *e)
 151 {
 152         /* FIXME: Make this configurable somehow. */
 153         const int touchpad_speed = 700;
 154         int dx, dy;
 155
 156         switch (e->code) {
 157         case ABS_X:
 158                 e->value -= device->abs.min_x;
 159                 if (device->abs.reset_x)
 160                         device->abs.reset_x = 0;
 161                 else {
 162                         dx =
 163                                 (e->value - device->abs.old_x) *
 164                                 touchpad_speed /
 165                                 (device->abs.max_x - device->abs.min_x);
 166                         device->rel.dx = wl_fixed_from_int(dx);
 167                 }
 168                 device->abs.old_x = e->value;
 169                 device->type |= EVDEV_RELATIVE_MOTION;
 170                 break;
 171         case ABS_Y:
 172                 e->value -= device->abs.min_y;
 173                 if (device->abs.reset_y)
 174                         device->abs.reset_y = 0;
 175                 else {
 176                         dy =
 177                                 (e->value - device->abs.old_y) *
 178                                 touchpad_speed /
 179                                 /* maybe use x size here to have the same scale? */
 180                                 (device->abs.max_y - device->abs.min_y);
 181                         device->rel.dy = wl_fixed_from_int(dy);
 182                 }
 183                 device->abs.old_y = e->value;
 184                 device->type |= EVDEV_RELATIVE_MOTION;
 185                 break;
 186         }
 187 }
 188
 189 static inline void
 190 evdev_process_relative(struct evdev_input_device *device,
 191                               struct input_event *e, uint32_t time)
 192 {
 193         switch (e->code) {
 194         case REL_X:
 195                 device->rel.dx += wl_fixed_from_int(e->value);
 196                 device->type |= EVDEV_RELATIVE_MOTION;
 197                 break;
 198         case REL_Y:
 199                 device->rel.dy += wl_fixed_from_int(e->value);
 200                 device->type |= EVDEV_RELATIVE_MOTION;
 201                 break;
 202         case REL_WHEEL:
 203                 notify_axis(&device->master->base.seat,
 204                               time,
 205                               WL_POINTER_AXIS_VERTICAL_SCROLL, e->value);
 206                 break;
 207         case REL_HWHEEL:
 208                 notify_axis(&device->master->base.seat,
 209                               time,
 210                               WL_POINTER_AXIS_HORIZONTAL_SCROLL, e->value);
 211                 break;
 212         }
 213 }
 214
 215 static inline void
 216 evdev_process_absolute(struct evdev_input_device *device,
 217                        struct input_event *e)
 218 {
 219         if (device->is_touchpad) {
 220                 evdev_process_absolute_motion_touchpad(device, e);
 221         } else if (device->is_mt) {
 222                 evdev_process_touch(device, e);
 223         } else {
 224                 evdev_process_absolute_motion(device, e);
 225         }
 226 }
 227
 228 static int
 229 is_motion_event(struct input_event *e)
 230 {
 231         switch (e->type) {
 232         case EV_REL:
 233                 switch (e->code) {
 234                 case REL_X:
 235                 case REL_Y:
 236                         return 1;
 237                 }
 238         case EV_ABS:
 239                 switch (e->code) {
 240                 case ABS_X:
 241                 case ABS_Y:
 242                 case ABS_MT_POSITION_X:
 243                 case ABS_MT_POSITION_Y:
 244                         return 1;
 245                 }
 246         }
 247
 248         return 0;
 249 }
 250
 251 static void
 252 evdev_flush_motion(struct evdev_input_device *device, uint32_t time)
 253 {
 254         struct weston_seat *master = &device->master->base;
 255
 256         if (!device->type)
 257                 return;
 258
 259         if (device->type & EVDEV_RELATIVE_MOTION) {
 260                 notify_motion(&master->seat, time,
 261                               master->seat.pointer->x + device->rel.dx,
 262                               master->seat.pointer->y + device->rel.dy);
 263                 device->type &= ~EVDEV_RELATIVE_MOTION;
 264                 device->rel.dx = 0;
 265                 device->rel.dy = 0;
 266         }
 267         if (device->type & EVDEV_ABSOLUTE_MT_DOWN) {
 268                 notify_touch(&master->seat, time,
 269                              device->mt.slot,
 270                              wl_fixed_from_int(device->mt.x[device->mt.slot]),
 271                              wl_fixed_from_int(device->mt.y[device->mt.slot]),
 272                              WL_TOUCH_DOWN);
 273                 device->type &= ~EVDEV_ABSOLUTE_MT_DOWN;
 274                 device->type &= ~EVDEV_ABSOLUTE_MT_MOTION;
 275         }
 276         if (device->type & EVDEV_ABSOLUTE_MT_MOTION) {
 277                 notify_touch(&master->seat, time,
 278                              device->mt.slot,
 279                              wl_fixed_from_int(device->mt.x[device->mt.slot]),
 280                              wl_fixed_from_int(device->mt.y[device->mt.slot]),
 281                              WL_TOUCH_MOTION);
 282                 device->type &= ~EVDEV_ABSOLUTE_MT_DOWN;
 283                 device->type &= ~EVDEV_ABSOLUTE_MT_MOTION;
 284         }
 285         if (device->type & EVDEV_ABSOLUTE_MT_UP) {
 286                 notify_touch(&master->seat, time, device->mt.slot, 0, 0,
 287                              WL_TOUCH_UP);
 288                 device->type &= ~EVDEV_ABSOLUTE_MT_UP;
 289         }
 290         if (device->type & EVDEV_ABSOLUTE_MOTION) {
 291                 notify_motion(&master->seat, time,
 292                               wl_fixed_from_int(device->abs.x),
 293                               wl_fixed_from_int(device->abs.y));
 294                 device->type &= ~EVDEV_ABSOLUTE_MOTION;
 295         }
 296 }
 297
 298 static void
 299 fallback_process(struct evdev_dispatch *dispatch,
 300                  struct evdev_input_device *device,
 301                  struct input_event *event,
 302                  uint32_t time)
 303 {
 304         switch (event->type) {
 305         case EV_REL:
 306                 evdev_process_relative(device, event, time);
 307                 break;
 308         case EV_ABS:
 309                 evdev_process_absolute(device, event);
 310                 break;
 311         case EV_KEY:
 312                 evdev_process_key(device, event, time);
 313                 break;
 314         }
 315 }
 316
 317 static void
 318 fallback_destroy(struct evdev_dispatch *dispatch)
 319 {
 320         free(dispatch);
 321 }
 322
 323 struct evdev_dispatch_interface fallback_interface = {
 324         fallback_process,
 325         fallback_destroy
 326 };
 327
 328 static struct evdev_dispatch *
 329 fallback_dispatch_create(void)
 330 {
 331         struct evdev_dispatch *dispatch = malloc(sizeof *dispatch);
 332         if (dispatch == NULL)
 333                 return NULL;
 334
 335         dispatch->interface = &fallback_interface;
 336
 337         return dispatch;
 338 }
 339
 340 static void
 341 evdev_process_events(struct evdev_input_device *device,
 342                      struct input_event *ev, int count)
 343 {
 344         struct evdev_dispatch *dispatch = device->dispatch;
 345         struct input_event *e, *end;
 346         uint32_t time = 0;
 347
 348         device->type = 0;
 349
 350         e = ev;
 351         end = e + count;
 352         for (e = ev; e < end; e++) {
 353                 time = e->time.tv_sec * 1000 + e->time.tv_usec / 1000;
 354
 355                 /* we try to minimize the amount of notifications to be
 356                  * forwarded to the compositor, so we accumulate motion
 357                  * events and send as a bunch */
 358                 if (!is_motion_event(e))
 359                         evdev_flush_motion(device, time);
 360
 361                 dispatch->interface->process(dispatch, device, e, time);
 362         }
 363
 364         evdev_flush_motion(device, time);
 365 }
 366
 367 static int
 368 evdev_input_device_data(int fd, uint32_t mask, void *data)
 369 {
 370         struct weston_compositor *ec;
 371         struct evdev_input_device *device = data;
 372         struct input_event ev[32];
 373         int len;
 374
 375         ec = device->master->base.compositor;
 376         if (!ec->focus)
 377                 return 1;
 378
 379         /* If the compositor is repainting, this function is called only once
 380          * per frame and we have to process all the events available on the
 381          * fd, otherwise there will be input lag. */
 382         do {
 383                 if (device->mtdev)
 384                         len = mtdev_get(device->mtdev, fd, ev,
 385                                         ARRAY_LENGTH(ev)) *
 386                                 sizeof (struct input_event);
 387                 else
 388                         len = read(fd, &ev, sizeof ev);
 389
 390                 if (len < 0 || len % sizeof ev[0] != 0) {
 391                         /* FIXME: call device_removed when errno is ENODEV. */
 392                         return 1;
 393                 }
 394
 395                 evdev_process_events(device, ev, len / sizeof ev[0]);
 396
 397         } while (len > 0);
 398
 399         return 1;
 400 }
 401
 402 static int
 403 evdev_configure_device(struct evdev_input_device *device)
 404 {
 405         struct input_absinfo absinfo;
 406         unsigned long ev_bits[NBITS(EV_MAX)];
 407         unsigned long abs_bits[NBITS(ABS_MAX)];
 408         unsigned long key_bits[NBITS(KEY_MAX)];
 409         int has_key, has_abs;
 410
 411         has_key = 0;
 412         has_abs = 0;
 413
 414         ioctl(device->fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits);
 415         if (TEST_BIT(ev_bits, EV_ABS)) {
 416                 has_abs = 1;
 417
 418                 ioctl(device->fd, EVIOCGBIT(EV_ABS, sizeof(abs_bits)),
 419                       abs_bits);
 420                 if (TEST_BIT(abs_bits, ABS_X)) {
 421                         ioctl(device->fd, EVIOCGABS(ABS_X), &absinfo);
 422                         device->abs.min_x = absinfo.minimum;
 423                         device->abs.max_x = absinfo.maximum;
 424                 }
 425                 if (TEST_BIT(abs_bits, ABS_Y)) {
 426                         ioctl(device->fd, EVIOCGABS(ABS_Y), &absinfo);
 427                         device->abs.min_y = absinfo.minimum;
 428                         device->abs.max_y = absinfo.maximum;
 429                 }
 430                 if (TEST_BIT(abs_bits, ABS_MT_SLOT)) {
 431                         device->is_mt = 1;
 432                         device->mt.slot = 0;
 433                 }
 434         }
 435         if (TEST_BIT(ev_bits, EV_KEY)) {
 436                 has_key = 1;
 437                 ioctl(device->fd, EVIOCGBIT(EV_KEY, sizeof(key_bits)),
 438                       key_bits);
 439                 if (TEST_BIT(key_bits, BTN_TOOL_FINGER) &&
 440                              !TEST_BIT(key_bits, BTN_TOOL_PEN))
 441                         device->is_touchpad = 1;
 442         }
 443
 444         /* This rule tries to catch accelerometer devices and opt out. We may
 445          * want to adjust the protocol later adding a proper event for dealing
 446          * with accelerometers and implement here accordingly */
 447         if (has_abs && !has_key)
 448                 return -1;
 449
 450         return 0;
 451 }
 452
 453 static struct evdev_input_device *
 454 evdev_input_device_create(struct evdev_seat *master,
 455                           struct wl_display *display, const char *path)
 456 {
 457         struct evdev_input_device *device;
 458         struct weston_compositor *ec;
 459
 460         device = malloc(sizeof *device);
 461         if (device == NULL)
 462                 return NULL;
 463
 464         ec = master->base.compositor;
 465         device->output =
 466                 container_of(ec->output_list.next, struct weston_output, link);
 467
 468         device->master = master;
 469         device->is_touchpad = 0;
 470         device->is_mt = 0;
 471         device->mtdev = NULL;
 472         device->devnode = strdup(path);
 473         device->mt.slot = -1;
 474         device->rel.dx = 0;
 475         device->rel.dy = 0;
 476         device->dispatch = NULL;
 477
 478         /* Use non-blocking mode so that we can loop on read on
 479          * evdev_input_device_data() until all events on the fd are
 480          * read.  mtdev_get() also expects this. */
 481         device->fd = weston_launcher_open(ec, path, O_RDONLY | O_NONBLOCK);
 482         if (device->fd < 0)
 483                 goto err0;
 484
 485         if (evdev_configure_device(device) == -1)
 486                 goto err1;
 487
 488         /* If the dispatch was not set up use the fallback. */
 489         if (device->dispatch == NULL)
 490                 device->dispatch = fallback_dispatch_create();
 491         if (device->dispatch == NULL)
 492                 goto err1;
 493
 494
 495         if (device->is_mt) {
 496                 device->mtdev = mtdev_new_open(device->fd);
 497                 if (!device->mtdev)
 498                         fprintf(stderr, "mtdev failed to open for %s\n", path);
 499         }
 500
 501         device->source = wl_event_loop_add_fd(ec->input_loop, device->fd,
 502                                               WL_EVENT_READABLE,
 503                                               evdev_input_device_data, device);
 504         if (device->source == NULL)
 505                 goto err2;
 506
 507         wl_list_insert(master->devices_list.prev, &device->link);
 508
 509         return device;
 510
 511 err2:
 512         device->dispatch->interface->destroy(device->dispatch);
 513 err1:
 514         close(device->fd);
 515 err0:
 516         free(device->devnode);
 517         free(device);
 518         return NULL;
 519 }
 520
 521 static const char default_seat[] = "seat0";
 522
 523 static void
 524 device_added(struct udev_device *udev_device, struct evdev_seat *master)
 525 {
 526         struct weston_compositor *c;
 527         const char *devnode;
 528         const char *device_seat;
 529
 530         device_seat = udev_device_get_property_value(udev_device, "ID_SEAT");
 531         if (!device_seat)
 532                 device_seat = default_seat;
 533
 534         if (strcmp(device_seat, master->seat_id))
 535                 return;
 536
 537         c = master->base.compositor;
 538         devnode = udev_device_get_devnode(udev_device);
 539         evdev_input_device_create(master, c->wl_display, devnode);
 540 }
 541
 542 static void
 543 device_removed(struct evdev_input_device *device)
 544 {
 545         struct evdev_dispatch *dispatch;
 546
 547         dispatch = device->dispatch;
 548         if (dispatch)
 549                 dispatch->interface->destroy(dispatch);
 550
 551         wl_event_source_remove(device->source);
 552         wl_list_remove(&device->link);
 553         if (device->mtdev)
 554                 mtdev_close_delete(device->mtdev);
 555         close(device->fd);
 556         free(device->devnode);
 557         free(device);
 558 }
 559
 560 static void
 561 evdev_notify_keyboard_focus(struct evdev_seat *seat)
 562 {
 563         struct evdev_input_device *device;
 564         struct wl_array keys;
 565         unsigned int i, set;
 566         char evdev_keys[(KEY_CNT + 7) / 8], all_keys[(KEY_CNT + 7) / 8];
 567         uint32_t *k;
 568         int ret;
 569
 570         memset(all_keys, 0, sizeof all_keys);
 571         wl_list_for_each(device, &seat->devices_list, link) {
 572                 memset(evdev_keys, 0, sizeof evdev_keys);
 573                 ret = ioctl(device->fd,
 574                             EVIOCGKEY(sizeof evdev_keys), evdev_keys);
 575                 if (ret < 0) {
 576                         fprintf(stderr, "failed to get keys for device %s\n",
 577                                 device->devnode);
 578                         continue;
 579                 }
 580                 for (i = 0; i < ARRAY_LENGTH(evdev_keys); i++)
 581                         all_keys[i] |= evdev_keys[i];
 582         }
 583
 584         wl_array_init(&keys);
 585         for (i = 0; i < KEY_CNT; i++) {
 586                 set = all_keys[i >> 3] & (1 << (i & 7));
 587                 if (set) {
 588                         k = wl_array_add(&keys, sizeof *k);
 589                         *k = i;
 590                 }
 591         }
 592
 593         notify_keyboard_focus(&seat->base.seat, &keys);
 594
 595         wl_array_release(&keys);
 596 }
 597
 598 void
 599 evdev_add_devices(struct udev *udev, struct weston_seat *seat_base)
 600 {
 601         struct evdev_seat *seat = (struct evdev_seat *) seat_base;
 602         struct udev_enumerate *e;
 603         struct udev_list_entry *entry;
 604         struct udev_device *device;
 605         const char *path, *sysname;
 606
 607         e = udev_enumerate_new(udev);
 608         udev_enumerate_add_match_subsystem(e, "input");
 609         udev_enumerate_scan_devices(e);
 610         udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(e)) {
 611                 path = udev_list_entry_get_name(entry);
 612                 device = udev_device_new_from_syspath(udev, path);
 613
 614                 sysname = udev_device_get_sysname(device);
 615                 if (strncmp("event", sysname, 5) != 0) {
 616                         udev_device_unref(device);
 617                         continue;
 618                 }
 619
 620                 device_added(device, seat);
 621
 622                 udev_device_unref(device);
 623         }
 624         udev_enumerate_unref(e);
 625
 626         evdev_notify_keyboard_focus(seat);
 627
 628         if (wl_list_empty(&seat->devices_list)) {
 629                 fprintf(stderr,
 630                         "warning: no input devices on entering Weston. "
 631                         "Possible causes:\n"
 632                         "\t- no permissions to read /dev/input/event*\n"
 633                         "\t- seats misconfigured "
 634                         "(Weston backend option 'seat', "
 635                         "udev device property ID_SEAT)\n");
 636         }
 637 }
 638
 639 static int
 640 evdev_udev_handler(int fd, uint32_t mask, void *data)
 641 {
 642         struct evdev_seat *master = data;
 643         struct udev_device *udev_device;
 644         struct evdev_input_device *device, *next;
 645         const char *action;
 646         const char *devnode;
 647
 648         udev_device = udev_monitor_receive_device(master->udev_monitor);
 649         if (!udev_device)
 650                 return 1;
 651
 652         action = udev_device_get_action(udev_device);
 653         if (action) {
 654                 if (strncmp("event", udev_device_get_sysname(udev_device), 5) != 0)
 655                         return 0;
 656
 657                 if (!strcmp(action, "add")) {
 658                         device_added(udev_device, master);
 659                 }
 660                 else if (!strcmp(action, "remove")) {
 661                         devnode = udev_device_get_devnode(udev_device);
 662                         wl_list_for_each_safe(device, next,
 663                                               &master->devices_list, link)
 664                                 if (!strcmp(device->devnode, devnode)) {
 665                                         device_removed(device);
 666                                         break;
 667                                 }
 668                 }
 669         }
 670         udev_device_unref(udev_device);
 671
 672         return 0;
 673 }
 674
 675 int
 676 evdev_enable_udev_monitor(struct udev *udev, struct weston_seat *seat_base)
 677 {
 678         struct evdev_seat *master = (struct evdev_seat *) seat_base;
 679         struct wl_event_loop *loop;
 680         struct weston_compositor *c = master->base.compositor;
 681         int fd;
 682
 683         master->udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
 684         if (!master->udev_monitor) {
 685                 fprintf(stderr, "udev: failed to create the udev monitor\n");
 686                 return 0;
 687         }
 688
 689         udev_monitor_filter_add_match_subsystem_devtype(master->udev_monitor,
 690                         "input", NULL);
 691
 692         if (udev_monitor_enable_receiving(master->udev_monitor)) {
 693                 fprintf(stderr, "udev: failed to bind the udev monitor\n");
 694                 udev_monitor_unref(master->udev_monitor);
 695                 return 0;
 696         }
 697
 698         loop = wl_display_get_event_loop(c->wl_display);
 699         fd = udev_monitor_get_fd(master->udev_monitor);
 700         master->udev_monitor_source =
 701                 wl_event_loop_add_fd(loop, fd, WL_EVENT_READABLE,
 702                                      evdev_udev_handler, master);
 703         if (!master->udev_monitor_source) {
 704                 udev_monitor_unref(master->udev_monitor);
 705                 return 0;
 706         }
 707
 708         return 1;
 709 }
 710
 711 void
 712 evdev_disable_udev_monitor(struct weston_seat *seat_base)
 713 {
 714         struct evdev_seat *seat = (struct evdev_seat *) seat_base;
 715
 716         if (!seat->udev_monitor)
 717                 return;
 718
 719         udev_monitor_unref(seat->udev_monitor);
 720         seat->udev_monitor = NULL;
 721         wl_event_source_remove(seat->udev_monitor_source);
 722         seat->udev_monitor_source = NULL;
 723 }
 724
 725 void
 726 evdev_input_create(struct weston_compositor *c, struct udev *udev,
 727                    const char *seat_id)
 728 {
 729         struct evdev_seat *seat;
 730
 731         seat = malloc(sizeof *seat);
 732         if (seat == NULL)
 733                 return;
 734
 735         memset(seat, 0, sizeof *seat);
 736         weston_seat_init(&seat->base, c);
 737
 738         wl_list_init(&seat->devices_list);
 739         seat->seat_id = strdup(seat_id);
 740         if (!evdev_enable_udev_monitor(udev, &seat->base)) {
 741                 free(seat->seat_id);
 742                 free(seat);
 743                 return;
 744         }
 745
 746         evdev_add_devices(udev, &seat->base);
 747
 748         c->seat = &seat->base;
 749 }
 750
 751 void
 752 evdev_remove_devices(struct weston_seat *seat_base)
 753 {
 754         struct evdev_seat *seat = (struct evdev_seat *) seat_base;
 755         struct evdev_input_device *device, *next;
 756
 757         wl_list_for_each_safe(device, next, &seat->devices_list, link)
 758                 device_removed(device);
 759
 760         notify_keyboard_focus(&seat->base.seat, NULL);
 761 }
 762
 763 void
 764 evdev_input_destroy(struct weston_seat *seat_base)
 765 {
 766         struct evdev_seat *seat = (struct evdev_seat *) seat_base;
 767
 768         evdev_remove_devices(seat_base);
 769         evdev_disable_udev_monitor(&seat->base);
 770
 771         wl_list_remove(&seat->base.link);
 772         free(seat->seat_id);
 773         free(seat);
 774 }