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 "launcher-util.h"
  34
  35 struct evdev_input {
  36         struct weston_input_device base;
  37         struct wl_list devices_list;
  38         struct udev_monitor *udev_monitor;
  39         struct wl_event_source *udev_monitor_source;
  40         char *seat_id;
  41 };
  42
  43 #define MAX_SLOTS 16
  44
  45 struct evdev_input_device {
  46         struct evdev_input *master;
  47         struct wl_list link;
  48         struct wl_event_source *source;
  49         struct weston_output *output;
  50         char *devnode;
  51         int fd;
  52         struct {
  53                 int min_x, max_x, min_y, max_y;
  54                 int old_x, old_y, reset_x, reset_y;
  55                 int32_t x, y;
  56         } abs;
  57
  58         struct {
  59                 int slot;
  60                 int32_t x[MAX_SLOTS];
  61                 int32_t y[MAX_SLOTS];
  62         } mt;
  63         struct mtdev *mtdev;
  64
  65         struct {
  66                 int dx, dy;
  67         } rel;
  68
  69         int type; /* event type flags */
  70
  71         int is_touchpad, is_mt;
  72 };
  73
  74 /* event type flags */
  75 #define EVDEV_ABSOLUTE_MOTION           (1 << 0)
  76 #define EVDEV_ABSOLUTE_MT_DOWN          (1 << 1)
  77 #define EVDEV_ABSOLUTE_MT_MOTION        (1 << 2)
  78 #define EVDEV_ABSOLUTE_MT_UP            (1 << 3)
  79 #define EVDEV_RELATIVE_MOTION           (1 << 4)
  80
  81 static inline void
  82 evdev_process_key(struct evdev_input_device *device,
  83                         struct input_event *e, int time)
  84 {
  85         if (e->value == 2)
  86                 return;
  87
  88         switch (e->code) {
  89         case BTN_TOOL_PEN:
  90         case BTN_TOOL_RUBBER:
  91         case BTN_TOOL_BRUSH:
  92         case BTN_TOOL_PENCIL:
  93         case BTN_TOOL_AIRBRUSH:
  94         case BTN_TOOL_FINGER:
  95         case BTN_TOOL_MOUSE:
  96         case BTN_TOOL_LENS:
  97                 if (device->is_touchpad)
  98                 {
  99                         device->abs.reset_x = 1;
 100                         device->abs.reset_y = 1;
 101                 }
 102                 break;
 103         case BTN_TOUCH:
 104                 /* Multitouch touchscreen devices might not send individually
 105                  * button events each time a new finger is down. So we don't
 106                  * send notification for such devices and we solve the button
 107                  * case emulating on compositor side. */
 108                 if (device->is_mt)
 109                         break;
 110
 111                 /* Treat BTN_TOUCH from devices that only have BTN_TOUCH as
 112                  * BTN_LEFT */
 113                 e->code = BTN_LEFT;
 114                 /* Intentional fallthrough! */
 115         case BTN_LEFT:
 116         case BTN_RIGHT:
 117         case BTN_MIDDLE:
 118         case BTN_SIDE:
 119         case BTN_EXTRA:
 120         case BTN_FORWARD:
 121         case BTN_BACK:
 122         case BTN_TASK:
 123                 notify_button(&device->master->base.input_device,
 124                               time, e->code, e->value);
 125                 break;
 126
 127         default:
 128                 notify_key(&device->master->base.input_device,
 129                            time, e->code, e->value);
 130                 break;
 131         }
 132 }
 133
 134 static void
 135 evdev_process_touch(struct evdev_input_device *device,
 136                     struct input_event *e)
 137 {
 138         const int screen_width = device->output->current->width;
 139         const int screen_height = device->output->current->height;
 140
 141         switch (e->code) {
 142         case ABS_MT_SLOT:
 143                 device->mt.slot = e->value;
 144                 break;
 145         case ABS_MT_TRACKING_ID:
 146                 if (e->value >= 0)
 147                         device->type |= EVDEV_ABSOLUTE_MT_DOWN;
 148                 else
 149                         device->type |= EVDEV_ABSOLUTE_MT_UP;
 150                 break;
 151         case ABS_MT_POSITION_X:
 152                 device->mt.x[device->mt.slot] =
 153                         (e->value - device->abs.min_x) * screen_width /
 154                         (device->abs.max_x - device->abs.min_x) +
 155                         device->output->x;
 156                 device->type |= EVDEV_ABSOLUTE_MT_MOTION;
 157                 break;
 158         case ABS_MT_POSITION_Y:
 159                 device->mt.y[device->mt.slot] =
 160                         (e->value - device->abs.min_y) * screen_height /
 161                         (device->abs.max_y - device->abs.min_y) +
 162                         device->output->y;
 163                 device->type |= EVDEV_ABSOLUTE_MT_MOTION;
 164                 break;
 165         }
 166 }
 167
 168 static inline void
 169 evdev_process_absolute_motion(struct evdev_input_device *device,
 170                               struct input_event *e)
 171 {
 172         const int screen_width = device->output->current->width;
 173         const int screen_height = device->output->current->height;
 174
 175         switch (e->code) {
 176         case ABS_X:
 177                 device->abs.x =
 178                         (e->value - device->abs.min_x) * screen_width /
 179                         (device->abs.max_x - device->abs.min_x) +
 180                         device->output->x;
 181                 device->type |= EVDEV_ABSOLUTE_MOTION;
 182                 break;
 183         case ABS_Y:
 184                 device->abs.y =
 185                         (e->value - device->abs.min_y) * screen_height /
 186                         (device->abs.max_y - device->abs.min_y) +
 187                         device->output->y;
 188                 device->type |= EVDEV_ABSOLUTE_MOTION;
 189                 break;
 190         }
 191 }
 192
 193 static inline void
 194 evdev_process_absolute_motion_touchpad(struct evdev_input_device *device,
 195                                        struct input_event *e)
 196 {
 197         /* FIXME: Make this configurable somehow. */
 198         const int touchpad_speed = 700;
 199
 200         switch (e->code) {
 201         case ABS_X:
 202                 e->value -= device->abs.min_x;
 203                 if (device->abs.reset_x)
 204                         device->abs.reset_x = 0;
 205                 else {
 206                         device->rel.dx =
 207                                 (e->value - device->abs.old_x) *
 208                                 touchpad_speed /
 209                                 (device->abs.max_x - device->abs.min_x);
 210                 }
 211                 device->abs.old_x = e->value;
 212                 device->type |= EVDEV_RELATIVE_MOTION;
 213                 break;
 214         case ABS_Y:
 215                 e->value -= device->abs.min_y;
 216                 if (device->abs.reset_y)
 217                         device->abs.reset_y = 0;
 218                 else {
 219                         device->rel.dy =
 220                                 (e->value - device->abs.old_y) *
 221                                 touchpad_speed /
 222                                 /* maybe use x size here to have the same scale? */
 223                                 (device->abs.max_y - device->abs.min_y);
 224                 }
 225                 device->abs.old_y = e->value;
 226                 device->type |= EVDEV_RELATIVE_MOTION;
 227                 break;
 228         }
 229 }
 230
 231 static inline void
 232 evdev_process_relative(struct evdev_input_device *device,
 233                               struct input_event *e, uint32_t time)
 234 {
 235         switch (e->code) {
 236         case REL_X:
 237                 device->rel.dx += e->value;
 238                 device->type |= EVDEV_RELATIVE_MOTION;
 239                 break;
 240         case REL_Y:
 241                 device->rel.dy += e->value;
 242                 device->type |= EVDEV_RELATIVE_MOTION;
 243                 break;
 244         case REL_WHEEL:
 245                 notify_axis(&device->master->base.input_device,
 246                               time,
 247                               WL_INPUT_DEVICE_AXIS_VERTICAL_SCROLL, e->value);
 248                 break;
 249         case REL_HWHEEL:
 250                 notify_axis(&device->master->base.input_device,
 251                               time,
 252                               WL_INPUT_DEVICE_AXIS_HORIZONTAL_SCROLL, e->value);
 253                 break;
 254         }
 255 }
 256
 257 static inline void
 258 evdev_process_absolute(struct evdev_input_device *device,
 259                        struct input_event *e)
 260 {
 261         if (device->is_touchpad) {
 262                 evdev_process_absolute_motion_touchpad(device, e);
 263         } else if (device->is_mt) {
 264                 evdev_process_touch(device, e);
 265         } else {
 266                 evdev_process_absolute_motion(device, e);
 267         }
 268 }
 269
 270 static int
 271 is_motion_event(struct input_event *e)
 272 {
 273         switch (e->type) {
 274         case EV_REL:
 275                 switch (e->code) {
 276                 case REL_X:
 277                 case REL_Y:
 278                         return 1;
 279                 }
 280         case EV_ABS:
 281                 switch (e->code) {
 282                 case ABS_X:
 283                 case ABS_Y:
 284                 case ABS_MT_POSITION_X:
 285                 case ABS_MT_POSITION_Y:
 286                         return 1;
 287                 }
 288         }
 289
 290         return 0;
 291 }
 292
 293 static void
 294 evdev_flush_motion(struct evdev_input_device *device, uint32_t time)
 295 {
 296         struct wl_input_device *master = &device->master->base.input_device;
 297
 298         if (!device->type)
 299                 return;
 300
 301         if (device->type & EVDEV_RELATIVE_MOTION) {
 302                 notify_motion(master, time,
 303                               wl_fixed_to_int(master->x) + device->rel.dx,
 304                               wl_fixed_to_int(master->y) + device->rel.dy);
 305                 device->type &= ~EVDEV_RELATIVE_MOTION;
 306                 device->rel.dx = 0;
 307                 device->rel.dy = 0;
 308         }
 309         if (device->type & EVDEV_ABSOLUTE_MT_DOWN) {
 310                 notify_touch(master, time,
 311                              device->mt.slot,
 312                              device->mt.x[device->mt.slot],
 313                              device->mt.y[device->mt.slot],
 314                              WL_INPUT_DEVICE_TOUCH_DOWN);
 315                 device->type &= ~EVDEV_ABSOLUTE_MT_DOWN;
 316                 device->type &= ~EVDEV_ABSOLUTE_MT_MOTION;
 317         }
 318         if (device->type & EVDEV_ABSOLUTE_MT_MOTION) {
 319                 notify_touch(master, time,
 320                              device->mt.slot,
 321                              device->mt.x[device->mt.slot],
 322                              device->mt.y[device->mt.slot],
 323                              WL_INPUT_DEVICE_TOUCH_MOTION);
 324                 device->type &= ~EVDEV_ABSOLUTE_MT_DOWN;
 325                 device->type &= ~EVDEV_ABSOLUTE_MT_MOTION;
 326         }
 327         if (device->type & EVDEV_ABSOLUTE_MT_UP) {
 328                 notify_touch(master, time, device->mt.slot, 0, 0,
 329                              WL_INPUT_DEVICE_TOUCH_UP);
 330                 device->type &= ~EVDEV_ABSOLUTE_MT_UP;
 331         }
 332         if (device->type & EVDEV_ABSOLUTE_MOTION) {
 333                 notify_motion(master, time, device->abs.x, device->abs.y);
 334                 device->type &= ~EVDEV_ABSOLUTE_MOTION;
 335         }
 336 }
 337
 338 static void
 339 evdev_process_events(struct evdev_input_device *device,
 340                      struct input_event *ev, int count)
 341 {
 342         struct input_event *e, *end;
 343         uint32_t time = 0;
 344
 345         device->type = 0;
 346
 347         e = ev;
 348         end = e + count;
 349         for (e = ev; e < end; e++) {
 350                 time = e->time.tv_sec * 1000 + e->time.tv_usec / 1000;
 351
 352                 /* we try to minimize the amount of notifications to be
 353                  * forwarded to the compositor, so we accumulate motion
 354                  * events and send as a bunch */
 355                 if (!is_motion_event(e))
 356                         evdev_flush_motion(device, time);
 357                 switch (e->type) {
 358                 case EV_REL:
 359                         evdev_process_relative(device, e, time);
 360                         break;
 361                 case EV_ABS:
 362                         evdev_process_absolute(device, e);
 363                         break;
 364                 case EV_KEY:
 365                         evdev_process_key(device, e, time);
 366                         break;
 367                 }
 368         }
 369
 370         evdev_flush_motion(device, time);
 371 }
 372
 373 static int
 374 evdev_input_device_data(int fd, uint32_t mask, void *data)
 375 {
 376         struct weston_compositor *ec;
 377         struct evdev_input_device *device = data;
 378         struct input_event ev[32];
 379         int len;
 380
 381         ec = device->master->base.compositor;
 382         if (!ec->focus)
 383                 return 1;
 384
 385         /* If the compositor is repainting, this function is called only once
 386          * per frame and we have to process all the events available on the
 387          * fd, otherwise there will be input lag. */
 388         do {
 389                 if (device->mtdev)
 390                         len = mtdev_get(device->mtdev, fd, ev,
 391                                         ARRAY_LENGTH(ev)) *
 392                                 sizeof (struct input_event);
 393                 else
 394                         len = read(fd, &ev, sizeof ev);
 395
 396                 if (len < 0 || len % sizeof ev[0] != 0) {
 397                         /* FIXME: call device_removed when errno is ENODEV. */
 398                         return 1;
 399                 }
 400
 401                 evdev_process_events(device, ev, len / sizeof ev[0]);
 402
 403         } while (len > 0);
 404
 405         return 1;
 406 }
 407
 408 /* copied from udev/extras/input_id/input_id.c */
 409 /* we must use this kernel-compatible implementation */
 410 #define BITS_PER_LONG (sizeof(unsigned long) * 8)
 411 #define NBITS(x) ((((x)-1)/BITS_PER_LONG)+1)
 412 #define OFF(x)  ((x)%BITS_PER_LONG)
 413 #define BIT(x)  (1UL<<OFF(x))
 414 #define LONG(x) ((x)/BITS_PER_LONG)
 415 #define TEST_BIT(array, bit)    ((array[LONG(bit)] >> OFF(bit)) & 1)
 416 /* end copied */
 417
 418 static int
 419 evdev_configure_device(struct evdev_input_device *device)
 420 {
 421         struct input_absinfo absinfo;
 422         unsigned long ev_bits[NBITS(EV_MAX)];
 423         unsigned long abs_bits[NBITS(ABS_MAX)];
 424         unsigned long key_bits[NBITS(KEY_MAX)];
 425         int has_key, has_abs;
 426
 427         has_key = 0;
 428         has_abs = 0;
 429
 430         ioctl(device->fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits);
 431         if (TEST_BIT(ev_bits, EV_ABS)) {
 432                 has_abs = 1;
 433
 434                 ioctl(device->fd, EVIOCGBIT(EV_ABS, sizeof(abs_bits)),
 435                       abs_bits);
 436                 if (TEST_BIT(abs_bits, ABS_X)) {
 437                         ioctl(device->fd, EVIOCGABS(ABS_X), &absinfo);
 438                         device->abs.min_x = absinfo.minimum;
 439                         device->abs.max_x = absinfo.maximum;
 440                 }
 441                 if (TEST_BIT(abs_bits, ABS_Y)) {
 442                         ioctl(device->fd, EVIOCGABS(ABS_Y), &absinfo);
 443                         device->abs.min_y = absinfo.minimum;
 444                         device->abs.max_y = absinfo.maximum;
 445                 }
 446                 if (TEST_BIT(abs_bits, ABS_MT_SLOT)) {
 447                         device->is_mt = 1;
 448                         device->mt.slot = 0;
 449                 }
 450         }
 451         if (TEST_BIT(ev_bits, EV_KEY)) {
 452                 has_key = 1;
 453                 ioctl(device->fd, EVIOCGBIT(EV_KEY, sizeof(key_bits)),
 454                       key_bits);
 455                 if (TEST_BIT(key_bits, BTN_TOOL_FINGER) &&
 456                              !TEST_BIT(key_bits, BTN_TOOL_PEN))
 457                         device->is_touchpad = 1;
 458         }
 459
 460         /* This rule tries to catch accelerometer devices and opt out. We may
 461          * want to adjust the protocol later adding a proper event for dealing
 462          * with accelerometers and implement here accordingly */
 463         if (has_abs && !has_key)
 464                 return -1;
 465
 466         return 0;
 467 }
 468
 469 static struct evdev_input_device *
 470 evdev_input_device_create(struct evdev_input *master,
 471                           struct wl_display *display, const char *path)
 472 {
 473         struct evdev_input_device *device;
 474         struct weston_compositor *ec;
 475
 476         device = malloc(sizeof *device);
 477         if (device == NULL)
 478                 return NULL;
 479
 480         ec = master->base.compositor;
 481         device->output =
 482                 container_of(ec->output_list.next, struct weston_output, link);
 483
 484         device->master = master;
 485         device->is_touchpad = 0;
 486         device->is_mt = 0;
 487         device->mtdev = NULL;
 488         device->devnode = strdup(path);
 489         device->mt.slot = -1;
 490         device->rel.dx = 0;
 491         device->rel.dy = 0;
 492
 493         /* Use non-blocking mode so that we can loop on read on
 494          * evdev_input_device_data() until all events on the fd are
 495          * read.  mtdev_get() also expects this. */
 496         device->fd = weston_launcher_open(ec, path, O_RDONLY | O_NONBLOCK);
 497         if (device->fd < 0)
 498                 goto err0;
 499
 500         if (evdev_configure_device(device) == -1)
 501                 goto err1;
 502
 503         if (device->is_mt) {
 504                 device->mtdev = mtdev_new_open(device->fd);
 505                 if (!device->mtdev)
 506                         fprintf(stderr, "mtdev failed to open for %s\n", path);
 507         }
 508
 509         device->source = wl_event_loop_add_fd(ec->input_loop, device->fd,
 510                                               WL_EVENT_READABLE,
 511                                               evdev_input_device_data, device);
 512         if (device->source == NULL)
 513                 goto err1;
 514
 515         wl_list_insert(master->devices_list.prev, &device->link);
 516
 517         return device;
 518
 519 err1:
 520         close(device->fd);
 521 err0:
 522         free(device->devnode);
 523         free(device);
 524         return NULL;
 525 }
 526
 527 static const char default_seat[] = "seat0";
 528
 529 static void
 530 device_added(struct udev_device *udev_device, struct evdev_input *master)
 531 {
 532         struct weston_compositor *c;
 533         const char *devnode;
 534         const char *device_seat;
 535
 536         device_seat = udev_device_get_property_value(udev_device, "ID_SEAT");
 537         if (!device_seat)
 538                 device_seat = default_seat;
 539
 540         if (strcmp(device_seat, master->seat_id))
 541                 return;
 542
 543         c = master->base.compositor;
 544         devnode = udev_device_get_devnode(udev_device);
 545         evdev_input_device_create(master, c->wl_display, devnode);
 546 }
 547
 548 static void
 549 device_removed(struct evdev_input_device *device)
 550 {
 551         wl_event_source_remove(device->source);
 552         wl_list_remove(&device->link);
 553         if (device->mtdev)
 554                 mtdev_close_delete(device->mtdev);
 555         close(device->fd);
 556         free(device->devnode);
 557         free(device);
 558 }
 559
 560 static void
 561 evdev_notify_keyboard_focus(struct evdev_input *input)
 562 {
 563         struct evdev_input_device *device;
 564         struct wl_array keys;
 565         unsigned int i, set;
 566         char evdev_keys[(KEY_CNT + 7) / 8], all_keys[(KEY_CNT + 7) / 8];
 567         uint32_t *k;
 568         int ret;
 569
 570         memset(all_keys, 0, sizeof all_keys);
 571         wl_list_for_each(device, &input->devices_list, link) {
 572                 memset(evdev_keys, 0, sizeof evdev_keys);
 573                 ret = ioctl(device->fd,
 574                             EVIOCGKEY(sizeof evdev_keys), evdev_keys);
 575                 if (ret < 0) {
 576                         fprintf(stderr, "failed to get keys for device %s\n",
 577                                 device->devnode);
 578                         continue;
 579                 }
 580                 for (i = 0; i < ARRAY_LENGTH(evdev_keys); i++)
 581                         all_keys[i] |= evdev_keys[i];
 582         }
 583
 584         wl_array_init(&keys);
 585         for (i = 0; i < KEY_CNT; i++) {
 586                 set = all_keys[i >> 3] & (1 << (i & 7));
 587                 if (set) {
 588                         k = wl_array_add(&keys, sizeof *k);
 589                         *k = i;
 590                 }
 591         }
 592
 593         notify_keyboard_focus(&input->base.input_device, &keys);
 594
 595         wl_array_release(&keys);
 596 }
 597
 598 void
 599 evdev_add_devices(struct udev *udev, struct weston_input_device *input_base)
 600 {
 601         struct evdev_input *input = (struct evdev_input *) input_base;
 602         struct udev_enumerate *e;
 603         struct udev_list_entry *entry;
 604         struct udev_device *device;
 605         const char *path, *sysname;
 606
 607         e = udev_enumerate_new(udev);
 608         udev_enumerate_add_match_subsystem(e, "input");
 609         udev_enumerate_scan_devices(e);
 610         udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(e)) {
 611                 path = udev_list_entry_get_name(entry);
 612                 device = udev_device_new_from_syspath(udev, path);
 613
 614                 sysname = udev_device_get_sysname(device);
 615                 if (strncmp("event", sysname, 5) != 0) {
 616                         udev_device_unref(device);
 617                         continue;
 618                 }
 619
 620                 device_added(device, input);
 621
 622                 udev_device_unref(device);
 623         }
 624         udev_enumerate_unref(e);
 625
 626         evdev_notify_keyboard_focus(input);
 627
 628         if (wl_list_empty(&input->devices_list)) {
 629                 fprintf(stderr,
 630                         "warning: no input devices on entering Weston. "
 631                         "Possible causes:\n"
 632                         "\t- no permissions to read /dev/input/event*\n"
 633                         "\t- seats misconfigured "
 634                         "(Weston backend option 'seat', "
 635                         "udev device property ID_SEAT)\n");
 636         }
 637 }
 638
 639 static int
 640 evdev_udev_handler(int fd, uint32_t mask, void *data)
 641 {
 642         struct evdev_input *master = data;
 643         struct udev_device *udev_device;
 644         struct evdev_input_device *device, *next;
 645         const char *action;
 646         const char *devnode;
 647
 648         udev_device = udev_monitor_receive_device(master->udev_monitor);
 649         if (!udev_device)
 650                 return 1;
 651
 652         action = udev_device_get_action(udev_device);
 653         if (action) {
 654                 if (strncmp("event", udev_device_get_sysname(udev_device), 5) != 0)
 655                         return 0;
 656
 657                 if (!strcmp(action, "add")) {
 658                         device_added(udev_device, master);
 659                 }
 660                 else if (!strcmp(action, "remove")) {
 661                         devnode = udev_device_get_devnode(udev_device);
 662                         wl_list_for_each_safe(device, next,
 663                                               &master->devices_list, link)
 664                                 if (!strcmp(device->devnode, devnode)) {
 665                                         device_removed(device);
 666                                         break;
 667                                 }
 668                 }
 669         }
 670         udev_device_unref(udev_device);
 671
 672         return 0;
 673 }
 674
 675 int
 676 evdev_enable_udev_monitor(struct udev *udev, struct weston_input_device *input_base)
 677 {
 678         struct evdev_input *master = (struct evdev_input *) input_base;
 679         struct wl_event_loop *loop;
 680         struct weston_compositor *c = master->base.compositor;
 681         int fd;
 682
 683         master->udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
 684         if (!master->udev_monitor) {
 685                 fprintf(stderr, "udev: failed to create the udev monitor\n");
 686                 return 0;
 687         }
 688
 689         udev_monitor_filter_add_match_subsystem_devtype(master->udev_monitor,
 690                         "input", NULL);
 691
 692         if (udev_monitor_enable_receiving(master->udev_monitor)) {
 693                 fprintf(stderr, "udev: failed to bind the udev monitor\n");
 694                 udev_monitor_unref(master->udev_monitor);
 695                 return 0;
 696         }
 697
 698         loop = wl_display_get_event_loop(c->wl_display);
 699         fd = udev_monitor_get_fd(master->udev_monitor);
 700         master->udev_monitor_source =
 701                 wl_event_loop_add_fd(loop, fd, WL_EVENT_READABLE,
 702                                      evdev_udev_handler, master);
 703         if (!master->udev_monitor_source) {
 704                 udev_monitor_unref(master->udev_monitor);
 705                 return 0;
 706         }
 707
 708         return 1;
 709 }
 710
 711 void
 712 evdev_disable_udev_monitor(struct weston_input_device *input_base)
 713 {
 714         struct evdev_input *input = (struct evdev_input *) input_base;
 715
 716         if (!input->udev_monitor)
 717                 return;
 718
 719         udev_monitor_unref(input->udev_monitor);
 720         input->udev_monitor = NULL;
 721         wl_event_source_remove(input->udev_monitor_source);
 722         input->udev_monitor_source = NULL;
 723 }
 724
 725 void
 726 evdev_input_create(struct weston_compositor *c, struct udev *udev,
 727                    const char *seat)
 728 {
 729         struct evdev_input *input;
 730
 731         input = malloc(sizeof *input);
 732         if (input == NULL)
 733                 return;
 734
 735         memset(input, 0, sizeof *input);
 736         weston_input_device_init(&input->base, c);
 737
 738         wl_list_init(&input->devices_list);
 739         input->seat_id = strdup(seat);
 740         if (!evdev_enable_udev_monitor(udev, &input->base)) {
 741                 free(input->seat_id);
 742                 free(input);
 743                 return;
 744         }
 745
 746         evdev_add_devices(udev, &input->base);
 747
 748         c->input_device = &input->base.input_device;
 749 }
 750
 751 void
 752 evdev_remove_devices(struct weston_input_device *input_base)
 753 {
 754         struct evdev_input *input = (struct evdev_input *) input_base;
 755         struct evdev_input_device *device, *next;
 756
 757         wl_list_for_each_safe(device, next, &input->devices_list, link)
 758                 device_removed(device);
 759
 760         notify_keyboard_focus(&input->base.input_device, NULL);
 761 }
 762
 763 void
 764 evdev_input_destroy(struct weston_input_device *input_base)
 765 {
 766         struct evdev_input *input = (struct evdev_input *) input_base;
 767
 768         evdev_remove_devices(input_base);
 769         evdev_disable_udev_monitor(&input->base);
 770
 771         wl_list_remove(&input->base.link);
 772         free(input->seat_id);
 773         free(input);
 774 }