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 <stdlib.h>
  24 #include <string.h>
  25 #include <linux/input.h>
  26 #include <unistd.h>
  27 #include <fcntl.h>
  28 #include <mtdev.h>
  29
  30 #include "compositor.h"
  31 #include "evdev.h"
  32 #include "evdev-private.h"
  33 #include "launcher-util.h"
  34 #include "log.h"
  35
  36 static void
  37 evdev_led_update(struct weston_seat *seat_base, enum weston_led leds)
  38 {
  39         static const struct {
  40                 enum weston_led weston;
  41                 int evdev;
  42         } map[] = {
  43                 { LED_NUM_LOCK, LED_NUML },
  44                 { LED_CAPS_LOCK, LED_CAPSL },
  45                 { LED_SCROLL_LOCK, LED_SCROLLL },
  46         };
  47         struct evdev_seat *seat = (struct evdev_seat *) seat_base;
  48         struct evdev_input_device *device;
  49         struct input_event ev[ARRAY_LENGTH(map)];
  50         unsigned int i;
  51
  52         memset(ev, 0, sizeof(ev));
  53         for (i = 0; i < ARRAY_LENGTH(map); i++) {
  54                 ev[i].type = EV_LED;
  55                 ev[i].code = map[i].evdev;
  56                 ev[i].value = !!(leds & map[i].weston);
  57         }
  58
  59         wl_list_for_each(device, &seat->devices_list, link) {
  60                 if (device->caps & EVDEV_KEYBOARD)
  61                         write(device->fd, ev, sizeof ev);
  62         }
  63 }
  64
  65 static inline void
  66 evdev_process_key(struct evdev_input_device *device,
  67                         struct input_event *e, int time)
  68 {
  69         if (e->value == 2)
  70                 return;
  71
  72         switch (e->code) {
  73         case BTN_LEFT:
  74         case BTN_RIGHT:
  75         case BTN_MIDDLE:
  76         case BTN_SIDE:
  77         case BTN_EXTRA:
  78         case BTN_FORWARD:
  79         case BTN_BACK:
  80         case BTN_TASK:
  81                 notify_button(&device->master->base.seat,
  82                               time, e->code,
  83                               e->value ? WL_POINTER_BUTTON_STATE_PRESSED :
  84                                          WL_POINTER_BUTTON_STATE_RELEASED);
  85                 break;
  86
  87         default:
  88                 notify_key(&device->master->base.seat,
  89                            time, e->code,
  90                            e->value ? WL_KEYBOARD_KEY_STATE_PRESSED :
  91                                       WL_KEYBOARD_KEY_STATE_RELEASED,
  92                            STATE_UPDATE_AUTOMATIC);
  93                 break;
  94         }
  95 }
  96
  97 static void
  98 evdev_process_touch(struct evdev_input_device *device,
  99                     struct input_event *e)
 100 {
 101         const int screen_width = device->output->current->width;
 102         const int screen_height = device->output->current->height;
 103
 104         switch (e->code) {
 105         case ABS_MT_SLOT:
 106                 device->mt.slot = e->value;
 107                 break;
 108         case ABS_MT_TRACKING_ID:
 109                 if (e->value >= 0)
 110                         device->pending_events |= EVDEV_ABSOLUTE_MT_DOWN;
 111                 else
 112                         device->pending_events |= EVDEV_ABSOLUTE_MT_UP;
 113                 break;
 114         case ABS_MT_POSITION_X:
 115                 device->mt.x[device->mt.slot] =
 116                         (e->value - device->abs.min_x) * screen_width /
 117                         (device->abs.max_x - device->abs.min_x) +
 118                         device->output->x;
 119                 device->pending_events |= EVDEV_ABSOLUTE_MT_MOTION;
 120                 break;
 121         case ABS_MT_POSITION_Y:
 122                 device->mt.y[device->mt.slot] =
 123                         (e->value - device->abs.min_y) * screen_height /
 124                         (device->abs.max_y - device->abs.min_y) +
 125                         device->output->y;
 126                 device->pending_events |= EVDEV_ABSOLUTE_MT_MOTION;
 127                 break;
 128         }
 129 }
 130
 131 static inline void
 132 evdev_process_absolute_motion(struct evdev_input_device *device,
 133                               struct input_event *e)
 134 {
 135         const int screen_width = device->output->current->width;
 136         const int screen_height = device->output->current->height;
 137
 138         switch (e->code) {
 139         case ABS_X:
 140                 device->abs.x =
 141                         (e->value - device->abs.min_x) * screen_width /
 142                         (device->abs.max_x - device->abs.min_x) +
 143                         device->output->x;
 144                 device->pending_events |= EVDEV_ABSOLUTE_MOTION;
 145                 break;
 146         case ABS_Y:
 147                 device->abs.y =
 148                         (e->value - device->abs.min_y) * screen_height /
 149                         (device->abs.max_y - device->abs.min_y) +
 150                         device->output->y;
 151                 device->pending_events |= EVDEV_ABSOLUTE_MOTION;
 152                 break;
 153         }
 154 }
 155
 156 static inline void
 157 evdev_process_relative(struct evdev_input_device *device,
 158                        struct input_event *e, uint32_t time)
 159 {
 160         switch (e->code) {
 161         case REL_X:
 162                 device->rel.dx += wl_fixed_from_int(e->value);
 163                 device->pending_events |= EVDEV_RELATIVE_MOTION;
 164                 break;
 165         case REL_Y:
 166                 device->rel.dy += wl_fixed_from_int(e->value);
 167                 device->pending_events |= EVDEV_RELATIVE_MOTION;
 168                 break;
 169         case REL_WHEEL:
 170                 notify_axis(&device->master->base.seat,
 171                               time,
 172                               WL_POINTER_AXIS_VERTICAL_SCROLL,
 173                               wl_fixed_from_int(e->value));
 174                 break;
 175         case REL_HWHEEL:
 176                 notify_axis(&device->master->base.seat,
 177                               time,
 178                               WL_POINTER_AXIS_HORIZONTAL_SCROLL,
 179                               wl_fixed_from_int(e->value));
 180                 break;
 181         }
 182 }
 183
 184 static inline void
 185 evdev_process_absolute(struct evdev_input_device *device,
 186                        struct input_event *e)
 187 {
 188         if (device->is_mt) {
 189                 evdev_process_touch(device, e);
 190         } else {
 191                 evdev_process_absolute_motion(device, e);
 192         }
 193 }
 194
 195 static int
 196 is_motion_event(struct input_event *e)
 197 {
 198         switch (e->type) {
 199         case EV_REL:
 200                 switch (e->code) {
 201                 case REL_X:
 202                 case REL_Y:
 203                         return 1;
 204                 }
 205         case EV_ABS:
 206                 switch (e->code) {
 207                 case ABS_X:
 208                 case ABS_Y:
 209                 case ABS_MT_POSITION_X:
 210                 case ABS_MT_POSITION_Y:
 211                         return 1;
 212                 }
 213         }
 214
 215         return 0;
 216 }
 217
 218 static void
 219 evdev_flush_motion(struct evdev_input_device *device, uint32_t time)
 220 {
 221         struct weston_seat *master = &device->master->base;
 222
 223         if (!device->pending_events)
 224                 return;
 225
 226         if (device->pending_events & EVDEV_RELATIVE_MOTION) {
 227                 notify_motion(&master->seat, time,
 228                               master->seat.pointer->x + device->rel.dx,
 229                               master->seat.pointer->y + device->rel.dy);
 230                 device->pending_events &= ~EVDEV_RELATIVE_MOTION;
 231                 device->rel.dx = 0;
 232                 device->rel.dy = 0;
 233         }
 234         if (device->pending_events & EVDEV_ABSOLUTE_MT_DOWN) {
 235                 notify_touch(&master->seat, time,
 236                              device->mt.slot,
 237                              wl_fixed_from_int(device->mt.x[device->mt.slot]),
 238                              wl_fixed_from_int(device->mt.y[device->mt.slot]),
 239                              WL_TOUCH_DOWN);
 240                 device->pending_events &= ~EVDEV_ABSOLUTE_MT_DOWN;
 241                 device->pending_events &= ~EVDEV_ABSOLUTE_MT_MOTION;
 242         }
 243         if (device->pending_events & EVDEV_ABSOLUTE_MT_MOTION) {
 244                 notify_touch(&master->seat, time,
 245                              device->mt.slot,
 246                              wl_fixed_from_int(device->mt.x[device->mt.slot]),
 247                              wl_fixed_from_int(device->mt.y[device->mt.slot]),
 248                              WL_TOUCH_MOTION);
 249                 device->pending_events &= ~EVDEV_ABSOLUTE_MT_DOWN;
 250                 device->pending_events &= ~EVDEV_ABSOLUTE_MT_MOTION;
 251         }
 252         if (device->pending_events & EVDEV_ABSOLUTE_MT_UP) {
 253                 notify_touch(&master->seat, time, device->mt.slot, 0, 0,
 254                              WL_TOUCH_UP);
 255                 device->pending_events &= ~EVDEV_ABSOLUTE_MT_UP;
 256         }
 257         if (device->pending_events & EVDEV_ABSOLUTE_MOTION) {
 258                 notify_motion(&master->seat, time,
 259                               wl_fixed_from_int(device->abs.x),
 260                               wl_fixed_from_int(device->abs.y));
 261                 device->pending_events &= ~EVDEV_ABSOLUTE_MOTION;
 262         }
 263 }
 264
 265 static void
 266 fallback_process(struct evdev_dispatch *dispatch,
 267                  struct evdev_input_device *device,
 268                  struct input_event *event,
 269                  uint32_t time)
 270 {
 271         switch (event->type) {
 272         case EV_REL:
 273                 evdev_process_relative(device, event, time);
 274                 break;
 275         case EV_ABS:
 276                 evdev_process_absolute(device, event);
 277                 break;
 278         case EV_KEY:
 279                 evdev_process_key(device, event, time);
 280                 break;
 281         }
 282 }
 283
 284 static void
 285 fallback_destroy(struct evdev_dispatch *dispatch)
 286 {
 287         free(dispatch);
 288 }
 289
 290 struct evdev_dispatch_interface fallback_interface = {
 291         fallback_process,
 292         fallback_destroy
 293 };
 294
 295 static struct evdev_dispatch *
 296 fallback_dispatch_create(void)
 297 {
 298         struct evdev_dispatch *dispatch = malloc(sizeof *dispatch);
 299         if (dispatch == NULL)
 300                 return NULL;
 301
 302         dispatch->interface = &fallback_interface;
 303
 304         return dispatch;
 305 }
 306
 307 static void
 308 evdev_process_events(struct evdev_input_device *device,
 309                      struct input_event *ev, int count)
 310 {
 311         struct evdev_dispatch *dispatch = device->dispatch;
 312         struct input_event *e, *end;
 313         uint32_t time = 0;
 314
 315         device->pending_events = 0;
 316
 317         e = ev;
 318         end = e + count;
 319         for (e = ev; e < end; e++) {
 320                 time = e->time.tv_sec * 1000 + e->time.tv_usec / 1000;
 321
 322                 /* we try to minimize the amount of notifications to be
 323                  * forwarded to the compositor, so we accumulate motion
 324                  * events and send as a bunch */
 325                 if (!is_motion_event(e))
 326                         evdev_flush_motion(device, time);
 327
 328                 dispatch->interface->process(dispatch, device, e, time);
 329         }
 330
 331         evdev_flush_motion(device, time);
 332 }
 333
 334 static int
 335 evdev_input_device_data(int fd, uint32_t mask, void *data)
 336 {
 337         struct weston_compositor *ec;
 338         struct evdev_input_device *device = data;
 339         struct input_event ev[32];
 340         int len;
 341
 342         ec = device->master->base.compositor;
 343         if (!ec->focus)
 344                 return 1;
 345
 346         /* If the compositor is repainting, this function is called only once
 347          * per frame and we have to process all the events available on the
 348          * fd, otherwise there will be input lag. */
 349         do {
 350                 if (device->mtdev)
 351                         len = mtdev_get(device->mtdev, fd, ev,
 352                                         ARRAY_LENGTH(ev)) *
 353                                 sizeof (struct input_event);
 354                 else
 355                         len = read(fd, &ev, sizeof ev);
 356
 357                 if (len < 0 || len % sizeof ev[0] != 0) {
 358                         /* FIXME: call device_removed when errno is ENODEV. */
 359                         return 1;
 360                 }
 361
 362                 evdev_process_events(device, ev, len / sizeof ev[0]);
 363
 364         } while (len > 0);
 365
 366         return 1;
 367 }
 368
 369 static int
 370 evdev_configure_device(struct evdev_input_device *device)
 371 {
 372         struct input_absinfo absinfo;
 373         unsigned long ev_bits[NBITS(EV_MAX)];
 374         unsigned long abs_bits[NBITS(ABS_MAX)];
 375         unsigned long rel_bits[NBITS(REL_MAX)];
 376         unsigned long key_bits[NBITS(KEY_MAX)];
 377         int has_key, has_abs;
 378         unsigned int i;
 379
 380         has_key = 0;
 381         has_abs = 0;
 382         device->caps = 0;
 383
 384         ioctl(device->fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits);
 385         if (TEST_BIT(ev_bits, EV_ABS)) {
 386                 has_abs = 1;
 387
 388                 ioctl(device->fd, EVIOCGBIT(EV_ABS, sizeof(abs_bits)),
 389                       abs_bits);
 390                 if (TEST_BIT(abs_bits, ABS_X)) {
 391                         ioctl(device->fd, EVIOCGABS(ABS_X), &absinfo);
 392                         device->abs.min_x = absinfo.minimum;
 393                         device->abs.max_x = absinfo.maximum;
 394                         device->caps |= EVDEV_MOTION_ABS;
 395                 }
 396                 if (TEST_BIT(abs_bits, ABS_Y)) {
 397                         ioctl(device->fd, EVIOCGABS(ABS_Y), &absinfo);
 398                         device->abs.min_y = absinfo.minimum;
 399                         device->abs.max_y = absinfo.maximum;
 400                         device->caps |= EVDEV_MOTION_ABS;
 401                 }
 402                 if (TEST_BIT(abs_bits, ABS_MT_SLOT)) {
 403                         ioctl(device->fd, EVIOCGABS(ABS_MT_POSITION_X),
 404                               &absinfo);
 405                         device->abs.min_x = absinfo.minimum;
 406                         device->abs.max_x = absinfo.maximum;
 407                         ioctl(device->fd, EVIOCGABS(ABS_MT_POSITION_Y),
 408                               &absinfo);
 409                         device->abs.min_y = absinfo.minimum;
 410                         device->abs.max_y = absinfo.maximum;
 411                         device->is_mt = 1;
 412                         device->mt.slot = 0;
 413                         device->caps |= EVDEV_TOUCH;
 414                 }
 415         }
 416         if (TEST_BIT(ev_bits, EV_REL)) {
 417                 ioctl(device->fd, EVIOCGBIT(EV_REL, sizeof(rel_bits)),
 418                       rel_bits);
 419                 if (TEST_BIT(rel_bits, REL_X) || TEST_BIT(rel_bits, REL_Y))
 420                         device->caps |= EVDEV_MOTION_REL;
 421         }
 422         if (TEST_BIT(ev_bits, EV_KEY)) {
 423                 has_key = 1;
 424                 ioctl(device->fd, EVIOCGBIT(EV_KEY, sizeof(key_bits)),
 425                       key_bits);
 426                 if (TEST_BIT(key_bits, BTN_TOOL_FINGER) &&
 427                     !TEST_BIT(key_bits, BTN_TOOL_PEN) &&
 428                     has_abs)
 429                         device->dispatch = evdev_touchpad_create(device);
 430                 for (i = KEY_ESC; i < KEY_MAX; i++) {
 431                         if (i >= BTN_MISC && i < KEY_OK)
 432                                 continue;
 433                         if (TEST_BIT(key_bits, i)) {
 434                                 device->caps |= EVDEV_KEYBOARD;
 435                                 break;
 436                         }
 437                 }
 438                 for (i = BTN_MISC; i < KEY_OK; i++) {
 439                         if (TEST_BIT(key_bits, i)) {
 440                                 device->caps |= EVDEV_BUTTON;
 441                                 break;
 442                         }
 443                 }
 444         }
 445         if (TEST_BIT(ev_bits, EV_LED)) {
 446                 device->caps |= EVDEV_KEYBOARD;
 447         }
 448
 449         /* This rule tries to catch accelerometer devices and opt out. We may
 450          * want to adjust the protocol later adding a proper event for dealing
 451          * with accelerometers and implement here accordingly */
 452         if (has_abs && !has_key && !device->is_mt)
 453                 return -1;
 454
 455         if ((device->caps &
 456              (EVDEV_MOTION_ABS | EVDEV_MOTION_REL | EVDEV_BUTTON)))
 457                 weston_seat_init_pointer(&device->master->base);
 458         if ((device->caps & EVDEV_KEYBOARD))
 459                 weston_seat_init_keyboard(&device->master->base, NULL);
 460         if ((device->caps & EVDEV_TOUCH))
 461                 weston_seat_init_touch(&device->master->base);
 462
 463         return 0;
 464 }
 465
 466 static struct evdev_input_device *
 467 evdev_input_device_create(struct evdev_seat *master,
 468                           struct wl_display *display, const char *path)
 469 {
 470         struct evdev_input_device *device;
 471         struct weston_compositor *ec;
 472
 473         device = malloc(sizeof *device);
 474         if (device == NULL)
 475                 return NULL;
 476
 477         ec = master->base.compositor;
 478         device->output =
 479                 container_of(ec->output_list.next, struct weston_output, link);
 480
 481         device->master = master;
 482         device->is_mt = 0;
 483         device->mtdev = NULL;
 484         device->devnode = strdup(path);
 485         device->mt.slot = -1;
 486         device->rel.dx = 0;
 487         device->rel.dy = 0;
 488         device->dispatch = NULL;
 489
 490         /* Use non-blocking mode so that we can loop on read on
 491          * evdev_input_device_data() until all events on the fd are
 492          * read.  mtdev_get() also expects this. */
 493         device->fd = weston_launcher_open(ec, path, O_RDWR | O_NONBLOCK);
 494         if (device->fd < 0)
 495                 goto err0;
 496
 497         if (evdev_configure_device(device) == -1)
 498                 goto err1;
 499
 500         /* If the dispatch was not set up use the fallback. */
 501         if (device->dispatch == NULL)
 502                 device->dispatch = fallback_dispatch_create();
 503         if (device->dispatch == NULL)
 504                 goto err1;
 505
 506
 507         if (device->is_mt) {
 508                 device->mtdev = mtdev_new_open(device->fd);
 509                 if (!device->mtdev)
 510                         weston_log("mtdev failed to open for %s\n", path);
 511         }
 512
 513         device->source = wl_event_loop_add_fd(ec->input_loop, device->fd,
 514                                               WL_EVENT_READABLE,
 515                                               evdev_input_device_data, device);
 516         if (device->source == NULL)
 517                 goto err2;
 518
 519         wl_list_insert(master->devices_list.prev, &device->link);
 520
 521         return device;
 522
 523 err2:
 524         device->dispatch->interface->destroy(device->dispatch);
 525 err1:
 526         close(device->fd);
 527 err0:
 528         free(device->devnode);
 529         free(device);
 530         return NULL;
 531 }
 532
 533 static const char default_seat[] = "seat0";
 534
 535 static void
 536 device_added(struct udev_device *udev_device, struct evdev_seat *master)
 537 {
 538         struct weston_compositor *c;
 539         const char *devnode;
 540         const char *device_seat;
 541
 542         device_seat = udev_device_get_property_value(udev_device, "ID_SEAT");
 543         if (!device_seat)
 544                 device_seat = default_seat;
 545
 546         if (strcmp(device_seat, master->seat_id))
 547                 return;
 548
 549         c = master->base.compositor;
 550         devnode = udev_device_get_devnode(udev_device);
 551         evdev_input_device_create(master, c->wl_display, devnode);
 552 }
 553
 554 static void
 555 device_removed(struct evdev_input_device *device)
 556 {
 557         struct evdev_dispatch *dispatch;
 558
 559         dispatch = device->dispatch;
 560         if (dispatch)
 561                 dispatch->interface->destroy(dispatch);
 562
 563         wl_event_source_remove(device->source);
 564         wl_list_remove(&device->link);
 565         if (device->mtdev)
 566                 mtdev_close_delete(device->mtdev);
 567         close(device->fd);
 568         free(device->devnode);
 569         free(device);
 570 }
 571
 572 static void
 573 evdev_notify_keyboard_focus(struct evdev_seat *seat)
 574 {
 575         struct evdev_input_device *device;
 576         struct wl_array keys;
 577         unsigned int i, set;
 578         char evdev_keys[(KEY_CNT + 7) / 8], all_keys[(KEY_CNT + 7) / 8];
 579         uint32_t *k;
 580         int ret;
 581
 582         memset(all_keys, 0, sizeof all_keys);
 583         wl_list_for_each(device, &seat->devices_list, link) {
 584                 memset(evdev_keys, 0, sizeof evdev_keys);
 585                 ret = ioctl(device->fd,
 586                             EVIOCGKEY(sizeof evdev_keys), evdev_keys);
 587                 if (ret < 0) {
 588                         weston_log("failed to get keys for device %s\n",
 589                                 device->devnode);
 590                         continue;
 591                 }
 592                 for (i = 0; i < ARRAY_LENGTH(evdev_keys); i++)
 593                         all_keys[i] |= evdev_keys[i];
 594         }
 595
 596         wl_array_init(&keys);
 597         for (i = 0; i < KEY_CNT; i++) {
 598                 set = all_keys[i >> 3] & (1 << (i & 7));
 599                 if (set) {
 600                         k = wl_array_add(&keys, sizeof *k);
 601                         *k = i;
 602                 }
 603         }
 604
 605         notify_keyboard_focus_in(&seat->base.seat, &keys,
 606                                  STATE_UPDATE_AUTOMATIC);
 607
 608         wl_array_release(&keys);
 609 }
 610
 611 void
 612 evdev_add_devices(struct udev *udev, struct weston_seat *seat_base)
 613 {
 614         struct evdev_seat *seat = (struct evdev_seat *) seat_base;
 615         struct udev_enumerate *e;
 616         struct udev_list_entry *entry;
 617         struct udev_device *device;
 618         const char *path, *sysname;
 619
 620         e = udev_enumerate_new(udev);
 621         udev_enumerate_add_match_subsystem(e, "input");
 622         udev_enumerate_scan_devices(e);
 623         udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(e)) {
 624                 path = udev_list_entry_get_name(entry);
 625                 device = udev_device_new_from_syspath(udev, path);
 626
 627                 sysname = udev_device_get_sysname(device);
 628                 if (strncmp("event", sysname, 5) != 0) {
 629                         udev_device_unref(device);
 630                         continue;
 631                 }
 632
 633                 device_added(device, seat);
 634
 635                 udev_device_unref(device);
 636         }
 637         udev_enumerate_unref(e);
 638
 639         evdev_notify_keyboard_focus(seat);
 640
 641         if (wl_list_empty(&seat->devices_list)) {
 642                 weston_log(
 643                         "warning: no input devices on entering Weston. "
 644                         "Possible causes:\n"
 645                         "\t- no permissions to read /dev/input/event*\n"
 646                         "\t- seats misconfigured "
 647                         "(Weston backend option 'seat', "
 648                         "udev device property ID_SEAT)\n");
 649         }
 650 }
 651
 652 static int
 653 evdev_udev_handler(int fd, uint32_t mask, void *data)
 654 {
 655         struct evdev_seat *master = data;
 656         struct udev_device *udev_device;
 657         struct evdev_input_device *device, *next;
 658         const char *action;
 659         const char *devnode;
 660
 661         udev_device = udev_monitor_receive_device(master->udev_monitor);
 662         if (!udev_device)
 663                 return 1;
 664
 665         action = udev_device_get_action(udev_device);
 666         if (action) {
 667                 if (strncmp("event", udev_device_get_sysname(udev_device), 5) != 0)
 668                         return 0;
 669
 670                 if (!strcmp(action, "add")) {
 671                         device_added(udev_device, master);
 672                 }
 673                 else if (!strcmp(action, "remove")) {
 674                         devnode = udev_device_get_devnode(udev_device);
 675                         wl_list_for_each_safe(device, next,
 676                                               &master->devices_list, link)
 677                                 if (!strcmp(device->devnode, devnode)) {
 678                                         device_removed(device);
 679                                         break;
 680                                 }
 681                 }
 682         }
 683         udev_device_unref(udev_device);
 684
 685         return 0;
 686 }
 687
 688 int
 689 evdev_enable_udev_monitor(struct udev *udev, struct weston_seat *seat_base)
 690 {
 691         struct evdev_seat *master = (struct evdev_seat *) seat_base;
 692         struct wl_event_loop *loop;
 693         struct weston_compositor *c = master->base.compositor;
 694         int fd;
 695
 696         master->udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
 697         if (!master->udev_monitor) {
 698                 weston_log("udev: failed to create the udev monitor\n");
 699                 return 0;
 700         }
 701
 702         udev_monitor_filter_add_match_subsystem_devtype(master->udev_monitor,
 703                         "input", NULL);
 704
 705         if (udev_monitor_enable_receiving(master->udev_monitor)) {
 706                 weston_log("udev: failed to bind the udev monitor\n");
 707                 udev_monitor_unref(master->udev_monitor);
 708                 return 0;
 709         }
 710
 711         loop = wl_display_get_event_loop(c->wl_display);
 712         fd = udev_monitor_get_fd(master->udev_monitor);
 713         master->udev_monitor_source =
 714                 wl_event_loop_add_fd(loop, fd, WL_EVENT_READABLE,
 715                                      evdev_udev_handler, master);
 716         if (!master->udev_monitor_source) {
 717                 udev_monitor_unref(master->udev_monitor);
 718                 return 0;
 719         }
 720
 721         return 1;
 722 }
 723
 724 void
 725 evdev_disable_udev_monitor(struct weston_seat *seat_base)
 726 {
 727         struct evdev_seat *seat = (struct evdev_seat *) seat_base;
 728
 729         if (!seat->udev_monitor)
 730                 return;
 731
 732         udev_monitor_unref(seat->udev_monitor);
 733         seat->udev_monitor = NULL;
 734         wl_event_source_remove(seat->udev_monitor_source);
 735         seat->udev_monitor_source = NULL;
 736 }
 737
 738 void
 739 evdev_input_create(struct weston_compositor *c, struct udev *udev,
 740                    const char *seat_id)
 741 {
 742         struct evdev_seat *seat;
 743
 744         seat = malloc(sizeof *seat);
 745         if (seat == NULL)
 746                 return;
 747
 748         memset(seat, 0, sizeof *seat);
 749         weston_seat_init(&seat->base, c);
 750         seat->base.led_update = evdev_led_update;
 751
 752         wl_list_init(&seat->devices_list);
 753         seat->seat_id = strdup(seat_id);
 754         if (!evdev_enable_udev_monitor(udev, &seat->base)) {
 755                 free(seat->seat_id);
 756                 free(seat);
 757                 return;
 758         }
 759
 760         evdev_add_devices(udev, &seat->base);
 761
 762         c->seat = &seat->base;
 763 }
 764
 765 void
 766 evdev_remove_devices(struct weston_seat *seat_base)
 767 {
 768         struct evdev_seat *seat = (struct evdev_seat *) seat_base;
 769         struct evdev_input_device *device, *next;
 770
 771         wl_list_for_each_safe(device, next, &seat->devices_list, link)
 772                 device_removed(device);
 773
 774         notify_keyboard_focus_out(&seat->base.seat);
 775 }
 776
 777 void
 778 evdev_input_destroy(struct weston_seat *seat_base)
 779 {
 780         struct evdev_seat *seat = (struct evdev_seat *) seat_base;
 781
 782         evdev_remove_devices(seat_base);
 783         evdev_disable_udev_monitor(&seat->base);
 784
 785         weston_seat_release(seat_base);
 786         free(seat->seat_id);
 787         free(seat);
 788 }