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
  34 struct evdev_input {
  35         struct weston_input_device base;
  36         struct wl_list devices_list;
  37         struct udev_monitor *udev_monitor;
  38         struct wl_event_source *udev_monitor_source;
  39         char *seat_id;
  40 };
  41
  42 #define MAX_SLOTS 16
  43
  44 struct evdev_input_device {
  45         struct evdev_input *master;
  46         struct wl_list link;
  47         struct wl_event_source *source;
  48         struct weston_output *output;
  49         char *devnode;
  50         int fd;
  51         struct {
  52                 int min_x, max_x, min_y, max_y;
  53                 int old_x, old_y, reset_x, reset_y;
  54                 int32_t x, y;
  55         } abs;
  56
  57         struct {
  58                 int slot;
  59                 int32_t x[MAX_SLOTS];
  60                 int32_t y[MAX_SLOTS];
  61         } mt;
  62         struct mtdev *mtdev;
  63
  64         struct {
  65                 int dx, dy;
  66         } rel;
  67
  68         int type; /* event type flags */
  69
  70         int is_touchpad, is_mt;
  71 };
  72
  73 /* event type flags */
  74 #define EVDEV_ABSOLUTE_MOTION           (1 << 0)
  75 #define EVDEV_ABSOLUTE_MT_DOWN          (1 << 1)
  76 #define EVDEV_ABSOLUTE_MT_MOTION        (1 << 2)
  77 #define EVDEV_ABSOLUTE_MT_UP            (1 << 3)
  78 #define EVDEV_RELATIVE_MOTION           (1 << 4)
  79
  80 static inline void
  81 evdev_process_key(struct evdev_input_device *device,
  82                         struct input_event *e, int time)
  83 {
  84         if (e->value == 2)
  85                 return;
  86
  87         switch (e->code) {
  88         case BTN_TOOL_PEN:
  89         case BTN_TOOL_RUBBER:
  90         case BTN_TOOL_BRUSH:
  91         case BTN_TOOL_PENCIL:
  92         case BTN_TOOL_AIRBRUSH:
  93         case BTN_TOOL_FINGER:
  94         case BTN_TOOL_MOUSE:
  95         case BTN_TOOL_LENS:
  96                 if (device->is_touchpad)
  97                 {
  98                         device->abs.reset_x = 1;
  99                         device->abs.reset_y = 1;
 100                 }
 101                 break;
 102         case BTN_TOUCH:
 103                 /* Multitouch touchscreen devices might not send individually
 104                  * button events each time a new finger is down. So we don't
 105                  * send notification for such devices and we solve the button
 106                  * case emulating on compositor side. */
 107                 if (device->is_mt)
 108                         break;
 109
 110                 /* Treat BTN_TOUCH from devices that only have BTN_TOUCH as
 111                  * BTN_LEFT */
 112                 e->code = BTN_LEFT;
 113                 /* Intentional fallthrough! */
 114         case BTN_LEFT:
 115         case BTN_RIGHT:
 116         case BTN_MIDDLE:
 117         case BTN_SIDE:
 118         case BTN_EXTRA:
 119         case BTN_FORWARD:
 120         case BTN_BACK:
 121         case BTN_TASK:
 122                 notify_button(&device->master->base.input_device,
 123                               time, e->code, e->value);
 124                 break;
 125
 126         default:
 127                 notify_key(&device->master->base.input_device,
 128                            time, e->code, e->value);
 129                 break;
 130         }
 131 }
 132
 133 static void
 134 evdev_process_touch(struct evdev_input_device *device,
 135                     struct input_event *e)
 136 {
 137         const int screen_width = device->output->current->width;
 138         const int screen_height = device->output->current->height;
 139
 140         switch (e->code) {
 141         case ABS_MT_SLOT:
 142                 device->mt.slot = e->value;
 143                 break;
 144         case ABS_MT_TRACKING_ID:
 145                 if (e->value >= 0)
 146                         device->type |= EVDEV_ABSOLUTE_MT_DOWN;
 147                 else
 148                         device->type |= EVDEV_ABSOLUTE_MT_UP;
 149                 break;
 150         case ABS_MT_POSITION_X:
 151                 device->mt.x[device->mt.slot] =
 152                         (e->value - device->abs.min_x) * screen_width /
 153                         (device->abs.max_x - device->abs.min_x) +
 154                         device->output->x;
 155                 device->type |= EVDEV_ABSOLUTE_MT_MOTION;
 156                 break;
 157         case ABS_MT_POSITION_Y:
 158                 device->mt.y[device->mt.slot] =
 159                         (e->value - device->abs.min_y) * screen_height /
 160                         (device->abs.max_y - device->abs.min_y) +
 161                         device->output->y;
 162                 device->type |= EVDEV_ABSOLUTE_MT_MOTION;
 163                 break;
 164         }
 165 }
 166
 167 static inline void
 168 evdev_process_absolute_motion(struct evdev_input_device *device,
 169                               struct input_event *e)
 170 {
 171         const int screen_width = device->output->current->width;
 172         const int screen_height = device->output->current->height;
 173
 174         switch (e->code) {
 175         case ABS_X:
 176                 device->abs.x =
 177                         (e->value - device->abs.min_x) * screen_width /
 178                         (device->abs.max_x - device->abs.min_x) +
 179                         device->output->x;
 180                 device->type |= EVDEV_ABSOLUTE_MOTION;
 181                 break;
 182         case ABS_Y:
 183                 device->abs.y =
 184                         (e->value - device->abs.min_y) * screen_height /
 185                         (device->abs.max_y - device->abs.min_y) +
 186                         device->output->y;
 187                 device->type |= EVDEV_ABSOLUTE_MOTION;
 188                 break;
 189         }
 190 }
 191
 192 static inline void
 193 evdev_process_absolute_motion_touchpad(struct evdev_input_device *device,
 194                                        struct input_event *e)
 195 {
 196         /* FIXME: Make this configurable somehow. */
 197         const int touchpad_speed = 700;
 198
 199         switch (e->code) {
 200         case ABS_X:
 201                 e->value -= device->abs.min_x;
 202                 if (device->abs.reset_x)
 203                         device->abs.reset_x = 0;
 204                 else {
 205                         device->rel.dx =
 206                                 (e->value - device->abs.old_x) *
 207                                 touchpad_speed /
 208                                 (device->abs.max_x - device->abs.min_x);
 209                 }
 210                 device->abs.old_x = e->value;
 211                 device->type |= EVDEV_RELATIVE_MOTION;
 212                 break;
 213         case ABS_Y:
 214                 e->value -= device->abs.min_y;
 215                 if (device->abs.reset_y)
 216                         device->abs.reset_y = 0;
 217                 else {
 218                         device->rel.dy =
 219                                 (e->value - device->abs.old_y) *
 220                                 touchpad_speed /
 221                                 /* maybe use x size here to have the same scale? */
 222                                 (device->abs.max_y - device->abs.min_y);
 223                 }
 224                 device->abs.old_y = e->value;
 225                 device->type |= EVDEV_RELATIVE_MOTION;
 226                 break;
 227         }
 228 }
 229
 230 static inline void
 231 evdev_process_relative(struct evdev_input_device *device,
 232                               struct input_event *e, uint32_t time)
 233 {
 234         switch (e->code) {
 235         case REL_X:
 236                 device->rel.dx += e->value;
 237                 device->type |= EVDEV_RELATIVE_MOTION;
 238                 break;
 239         case REL_Y:
 240                 device->rel.dy += e->value;
 241                 device->type |= EVDEV_RELATIVE_MOTION;
 242                 break;
 243         case REL_WHEEL:
 244                 notify_axis(&device->master->base.input_device,
 245                               time,
 246                               WL_INPUT_DEVICE_AXIS_VERTICAL_SCROLL, e->value);
 247                 break;
 248         case REL_HWHEEL:
 249                 notify_axis(&device->master->base.input_device,
 250                               time,
 251                               WL_INPUT_DEVICE_AXIS_HORIZONTAL_SCROLL, e->value);
 252                 break;
 253         }
 254 }
 255
 256 static inline void
 257 evdev_process_absolute(struct evdev_input_device *device,
 258                        struct input_event *e)
 259 {
 260         if (device->is_touchpad) {
 261                 evdev_process_absolute_motion_touchpad(device, e);
 262         } else if (device->is_mt) {
 263                 evdev_process_touch(device, e);
 264         } else {
 265                 evdev_process_absolute_motion(device, e);
 266         }
 267 }
 268
 269 static int
 270 is_motion_event(struct input_event *e)
 271 {
 272         switch (e->type) {
 273         case EV_REL:
 274                 switch (e->code) {
 275                 case REL_X:
 276                 case REL_Y:
 277                         return 1;
 278                 }
 279         case EV_ABS:
 280                 switch (e->code) {
 281                 case ABS_X:
 282                 case ABS_Y:
 283                 case ABS_MT_POSITION_X:
 284                 case ABS_MT_POSITION_Y:
 285                         return 1;
 286                 }
 287         }
 288
 289         return 0;
 290 }
 291
 292 static void
 293 evdev_flush_motion(struct evdev_input_device *device, uint32_t time)
 294 {
 295         struct wl_input_device *master = &device->master->base.input_device;
 296
 297         if (!device->type)
 298                 return;
 299
 300         if (device->type & EVDEV_RELATIVE_MOTION) {
 301                 notify_motion(master, time,
 302                               master->x + device->rel.dx,
 303                               master->y + device->rel.dy);
 304                 device->type &= ~EVDEV_RELATIVE_MOTION;
 305                 device->rel.dx = 0;
 306                 device->rel.dy = 0;
 307         }
 308         if (device->type & EVDEV_ABSOLUTE_MT_DOWN) {
 309                 notify_touch(master, time,
 310                              device->mt.slot,
 311                              device->mt.x[device->mt.slot],
 312                              device->mt.y[device->mt.slot],
 313                              WL_INPUT_DEVICE_TOUCH_DOWN);
 314                 device->type &= ~EVDEV_ABSOLUTE_MT_DOWN;
 315                 device->type &= ~EVDEV_ABSOLUTE_MT_MOTION;
 316         }
 317         if (device->type & EVDEV_ABSOLUTE_MT_MOTION) {
 318                 notify_touch(master, time,
 319                              device->mt.slot,
 320                              device->mt.x[device->mt.slot],
 321                              device->mt.y[device->mt.slot],
 322                              WL_INPUT_DEVICE_TOUCH_MOTION);
 323                 device->type &= ~EVDEV_ABSOLUTE_MT_DOWN;
 324                 device->type &= ~EVDEV_ABSOLUTE_MT_MOTION;
 325         }
 326         if (device->type & EVDEV_ABSOLUTE_MT_UP) {
 327                 notify_touch(master, time, device->mt.slot, 0, 0,
 328                              WL_INPUT_DEVICE_TOUCH_UP);
 329                 device->type &= ~EVDEV_ABSOLUTE_MT_UP;
 330         }
 331         if (device->type & EVDEV_ABSOLUTE_MOTION) {
 332                 notify_motion(master, time, device->abs.x, device->abs.y);
 333                 device->type &= ~EVDEV_ABSOLUTE_MOTION;
 334         }
 335 }
 336
 337 static void
 338 evdev_process_events(struct evdev_input_device *device,
 339                      struct input_event *ev, int count)
 340 {
 341         struct input_event *e, *end;
 342         uint32_t time = 0;
 343
 344         device->type = 0;
 345
 346         e = ev;
 347         end = e + count;
 348         for (e = ev; e < end; e++) {
 349                 time = e->time.tv_sec * 1000 + e->time.tv_usec / 1000;
 350
 351                 /* we try to minimize the amount of notifications to be
 352                  * forwarded to the compositor, so we accumulate motion
 353                  * events and send as a bunch */
 354                 if (!is_motion_event(e))
 355                         evdev_flush_motion(device, time);
 356                 switch (e->type) {
 357                 case EV_REL:
 358                         evdev_process_relative(device, e, time);
 359                         break;
 360                 case EV_ABS:
 361                         evdev_process_absolute(device, e);
 362                         break;
 363                 case EV_KEY:
 364                         evdev_process_key(device, e, time);
 365                         break;
 366                 }
 367         }
 368
 369         evdev_flush_motion(device, time);
 370 }
 371
 372 static int
 373 evdev_input_device_data(int fd, uint32_t mask, void *data)
 374 {
 375         struct weston_compositor *ec;
 376         struct evdev_input_device *device = data;
 377         struct input_event ev[32];
 378         int len;
 379
 380         ec = device->master->base.compositor;
 381         if (!ec->focus)
 382                 return 1;
 383
 384         /* If the compositor is repainting, this function is called only once
 385          * per frame and we have to process all the events available on the
 386          * fd, otherwise there will be input lag. */
 387         do {
 388                 if (device->mtdev)
 389                         len = mtdev_get(device->mtdev, fd, ev,
 390                                         ARRAY_LENGTH(ev)) *
 391                                 sizeof (struct input_event);
 392                 else
 393                         len = read(fd, &ev, sizeof ev);
 394
 395                 if (len < 0 || len % sizeof ev[0] != 0) {
 396                         /* FIXME: call device_removed when errno is ENODEV. */
 397                         return 1;
 398                 }
 399
 400                 evdev_process_events(device, ev, len / sizeof ev[0]);
 401
 402         } while (len > 0);
 403
 404         return 1;
 405 }
 406
 407 /* copied from udev/extras/input_id/input_id.c */
 408 /* we must use this kernel-compatible implementation */
 409 #define BITS_PER_LONG (sizeof(unsigned long) * 8)
 410 #define NBITS(x) ((((x)-1)/BITS_PER_LONG)+1)
 411 #define OFF(x)  ((x)%BITS_PER_LONG)
 412 #define BIT(x)  (1UL<<OFF(x))
 413 #define LONG(x) ((x)/BITS_PER_LONG)
 414 #define TEST_BIT(array, bit)    ((array[LONG(bit)] >> OFF(bit)) & 1)
 415 /* end copied */
 416
 417 static int
 418 evdev_configure_device(struct evdev_input_device *device)
 419 {
 420         struct input_absinfo absinfo;
 421         unsigned long ev_bits[NBITS(EV_MAX)];
 422         unsigned long abs_bits[NBITS(ABS_MAX)];
 423         unsigned long key_bits[NBITS(KEY_MAX)];
 424         int has_key, has_abs;
 425
 426         has_key = 0;
 427         has_abs = 0;
 428
 429         ioctl(device->fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits);
 430         if (TEST_BIT(ev_bits, EV_ABS)) {
 431                 has_abs = 1;
 432
 433                 ioctl(device->fd, EVIOCGBIT(EV_ABS, sizeof(abs_bits)),
 434                       abs_bits);
 435                 if (TEST_BIT(abs_bits, ABS_X)) {
 436                         ioctl(device->fd, EVIOCGABS(ABS_X), &absinfo);
 437                         device->abs.min_x = absinfo.minimum;
 438                         device->abs.max_x = absinfo.maximum;
 439                 }
 440                 if (TEST_BIT(abs_bits, ABS_Y)) {
 441                         ioctl(device->fd, EVIOCGABS(ABS_Y), &absinfo);
 442                         device->abs.min_y = absinfo.minimum;
 443                         device->abs.max_y = absinfo.maximum;
 444                 }
 445                 if (TEST_BIT(abs_bits, ABS_MT_SLOT)) {
 446                         device->is_mt = 1;
 447                         device->mt.slot = 0;
 448                 }
 449         }
 450         if (TEST_BIT(ev_bits, EV_KEY)) {
 451                 has_key = 1;
 452                 ioctl(device->fd, EVIOCGBIT(EV_KEY, sizeof(key_bits)),
 453                       key_bits);
 454                 if (TEST_BIT(key_bits, BTN_TOOL_FINGER) &&
 455                              !TEST_BIT(key_bits, BTN_TOOL_PEN))
 456                         device->is_touchpad = 1;
 457         }
 458
 459         /* This rule tries to catch accelerometer devices and opt out. We may
 460          * want to adjust the protocol later adding a proper event for dealing
 461          * with accelerometers and implement here accordingly */
 462         if (has_abs && !has_key)
 463                 return -1;
 464
 465         return 0;
 466 }
 467
 468 static struct evdev_input_device *
 469 evdev_input_device_create(struct evdev_input *master,
 470                           struct wl_display *display, const char *path)
 471 {
 472         struct evdev_input_device *device;
 473         struct weston_compositor *ec;
 474
 475         device = malloc(sizeof *device);
 476         if (device == NULL)
 477                 return NULL;
 478
 479         ec = master->base.compositor;
 480         device->output =
 481                 container_of(ec->output_list.next, struct weston_output, link);
 482
 483         device->master = master;
 484         device->is_touchpad = 0;
 485         device->is_mt = 0;
 486         device->mtdev = NULL;
 487         device->devnode = strdup(path);
 488         device->mt.slot = -1;
 489         device->rel.dx = 0;
 490         device->rel.dy = 0;
 491
 492         /* Use non-blocking mode so that we can loop on read on
 493          * evdev_input_device_data() until all events on the fd are
 494          * read.  mtdev_get() also expects this. */
 495         device->fd = open(path, O_RDONLY | O_NONBLOCK);
 496         if (device->fd < 0)
 497                 goto err0;
 498
 499         if (evdev_configure_device(device) == -1)
 500                 goto err1;
 501
 502         if (device->is_mt) {
 503                 device->mtdev = mtdev_new_open(device->fd);
 504                 if (!device->mtdev)
 505                         fprintf(stderr, "mtdev failed to open for %s\n", path);
 506         }
 507
 508         device->source = wl_event_loop_add_fd(ec->input_loop, device->fd,
 509                                               WL_EVENT_READABLE,
 510                                               evdev_input_device_data, device);
 511         if (device->source == NULL)
 512                 goto err1;
 513
 514         wl_list_insert(master->devices_list.prev, &device->link);
 515
 516         return device;
 517
 518 err1:
 519         close(device->fd);
 520 err0:
 521         free(device->devnode);
 522         free(device);
 523         return NULL;
 524 }
 525
 526 static const char default_seat[] = "seat0";
 527
 528 static void
 529 device_added(struct udev_device *udev_device, struct evdev_input *master)
 530 {
 531         struct weston_compositor *c;
 532         const char *devnode;
 533         const char *device_seat;
 534
 535         device_seat = udev_device_get_property_value(udev_device, "ID_SEAT");
 536         if (!device_seat)
 537                 device_seat = default_seat;
 538
 539         if (strcmp(device_seat, master->seat_id))
 540                 return;
 541
 542         c = master->base.compositor;
 543         devnode = udev_device_get_devnode(udev_device);
 544         evdev_input_device_create(master, c->wl_display, devnode);
 545 }
 546
 547 static void
 548 device_removed(struct evdev_input_device *device)
 549 {
 550         wl_event_source_remove(device->source);
 551         wl_list_remove(&device->link);
 552         if (device->mtdev)
 553                 mtdev_close_delete(device->mtdev);
 554         close(device->fd);
 555         free(device->devnode);
 556         free(device);
 557 }
 558
 559 void
 560 evdev_add_devices(struct udev *udev, struct weston_input_device *input_base)
 561 {
 562         struct evdev_input *input = (struct evdev_input *) input_base;
 563         struct udev_enumerate *e;
 564         struct udev_list_entry *entry;
 565         struct udev_device *device;
 566         const char *path, *sysname;
 567
 568         e = udev_enumerate_new(udev);
 569         udev_enumerate_add_match_subsystem(e, "input");
 570         udev_enumerate_scan_devices(e);
 571         udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(e)) {
 572                 path = udev_list_entry_get_name(entry);
 573                 device = udev_device_new_from_syspath(udev, path);
 574
 575                 sysname = udev_device_get_sysname(device);
 576                 if (strncmp("event", sysname, 5) != 0) {
 577                         udev_device_unref(device);
 578                         continue;
 579                 }
 580
 581                 device_added(device, input);
 582
 583                 udev_device_unref(device);
 584         }
 585         udev_enumerate_unref(e);
 586
 587         if (wl_list_empty(&input->devices_list)) {
 588                 fprintf(stderr,
 589                         "warning: no input devices on entering Weston. "
 590                         "Possible causes:\n"
 591                         "\t- no permissions to read /dev/input/event*\n"
 592                         "\t- seats misconfigured "
 593                         "(Weston backend option 'seat', "
 594                         "udev device property ID_SEAT)\n");
 595         }
 596 }
 597
 598 static int
 599 evdev_udev_handler(int fd, uint32_t mask, void *data)
 600 {
 601         struct evdev_input *master = data;
 602         struct udev_device *udev_device;
 603         struct evdev_input_device *device, *next;
 604         const char *action;
 605         const char *devnode;
 606
 607         udev_device = udev_monitor_receive_device(master->udev_monitor);
 608         if (!udev_device)
 609                 return 1;
 610
 611         action = udev_device_get_action(udev_device);
 612         if (action) {
 613                 if (strncmp("event", udev_device_get_sysname(udev_device), 5) != 0)
 614                         return 0;
 615
 616                 if (!strcmp(action, "add")) {
 617                         device_added(udev_device, master);
 618                 }
 619                 else if (!strcmp(action, "remove")) {
 620                         devnode = udev_device_get_devnode(udev_device);
 621                         wl_list_for_each_safe(device, next,
 622                                               &master->devices_list, link)
 623                                 if (!strcmp(device->devnode, devnode)) {
 624                                         device_removed(device);
 625                                         break;
 626                                 }
 627                 }
 628         }
 629         udev_device_unref(udev_device);
 630
 631         return 0;
 632 }
 633
 634 static int
 635 evdev_config_udev_monitor(struct udev *udev, struct evdev_input *master)
 636 {
 637         struct wl_event_loop *loop;
 638         struct weston_compositor *c = master->base.compositor;
 639         int fd;
 640
 641         master->udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
 642         if (!master->udev_monitor) {
 643                 fprintf(stderr, "udev: failed to create the udev monitor\n");
 644                 return 0;
 645         }
 646
 647         udev_monitor_filter_add_match_subsystem_devtype(master->udev_monitor,
 648                         "input", NULL);
 649
 650         if (udev_monitor_enable_receiving(master->udev_monitor)) {
 651                 fprintf(stderr, "udev: failed to bind the udev monitor\n");
 652                 udev_monitor_unref(master->udev_monitor);
 653                 return 0;
 654         }
 655
 656         loop = wl_display_get_event_loop(c->wl_display);
 657         fd = udev_monitor_get_fd(master->udev_monitor);
 658         master->udev_monitor_source =
 659                 wl_event_loop_add_fd(loop, fd, WL_EVENT_READABLE,
 660                                      evdev_udev_handler, master);
 661         if (!master->udev_monitor_source) {
 662                 udev_monitor_unref(master->udev_monitor);
 663                 return 0;
 664         }
 665
 666         return 1;
 667 }
 668
 669 void
 670 evdev_input_create(struct weston_compositor *c, struct udev *udev,
 671                    const char *seat)
 672 {
 673         struct evdev_input *input;
 674
 675         input = malloc(sizeof *input);
 676         if (input == NULL)
 677                 return;
 678
 679         memset(input, 0, sizeof *input);
 680         weston_input_device_init(&input->base, c);
 681
 682         wl_list_init(&input->devices_list);
 683         input->seat_id = strdup(seat);
 684         if (!evdev_config_udev_monitor(udev, input)) {
 685                 free(input->seat_id);
 686                 free(input);
 687                 return;
 688         }
 689
 690         evdev_add_devices(udev, &input->base);
 691
 692         c->input_device = &input->base.input_device;
 693 }
 694
 695 void
 696 evdev_remove_devices(struct weston_input_device *input_base)
 697 {
 698         struct evdev_input *input = (struct evdev_input *) input_base;
 699         struct evdev_input_device *device, *next;
 700
 701         wl_list_for_each_safe(device, next, &input->devices_list, link)
 702                 device_removed(device);
 703 }
 704
 705 void
 706 evdev_input_destroy(struct weston_input_device *input_base)
 707 {
 708         struct evdev_input *input = (struct evdev_input *) input_base;
 709
 710         evdev_remove_devices(input_base);
 711
 712         udev_monitor_unref(input->udev_monitor);
 713         wl_event_source_remove(input->udev_monitor_source);
 714
 715         wl_list_remove(&input->base.link);
 716         free(input->seat_id);
 717         free(input);
 718 }