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