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