src/udev-seat.c

   1 /*
   2  * Copyright © 2013 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 "config.h"
  24
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <unistd.h>
  28 #include <fcntl.h>
  29
  30 #include "compositor.h"
  31 #include "launcher-util.h"
  32 #include "evdev.h"
  33 #include "udev-seat.h"
  34
  35 static const char default_seat[] = "seat0";
  36 static const char default_seat_name[] = "default";
  37
  38 static struct udev_seat *
  39 udev_seat_create(struct weston_compositor *c, const char *seat_name);
  40 static void
  41 udev_seat_destroy(struct udev_seat *seat);
  42
  43 static int
  44 device_added(struct udev_device *udev_device, struct udev_input *input)
  45 {
  46         struct weston_compositor *c;
  47         struct evdev_device *device;
  48         struct weston_output *output;
  49         const char *devnode;
  50         const char *device_seat, *seat_name, *output_name;
  51         const char *calibration_values;
  52         int fd;
  53         struct udev_seat *seat;
  54
  55         device_seat = udev_device_get_property_value(udev_device, "ID_SEAT");
  56         if (!device_seat)
  57                 device_seat = default_seat;
  58
  59         if (strcmp(device_seat, input->seat_id))
  60                 return 0;
  61
  62         c = input->compositor;
  63         devnode = udev_device_get_devnode(udev_device);
  64
  65         /* Search for matching logical seat */
  66         seat_name = udev_device_get_property_value(udev_device, "WL_SEAT");
  67         if (!seat_name)
  68                 seat_name = default_seat_name;
  69
  70         seat = udev_seat_get_named(c, seat_name);
  71
  72         if (seat == NULL)
  73                 return -1;
  74
  75         /* Use non-blocking mode so that we can loop on read on
  76          * evdev_device_data() until all events on the fd are
  77          * read.  mtdev_get() also expects this. */
  78         fd = weston_launcher_open(c->launcher, devnode, O_RDWR | O_NONBLOCK);
  79         if (fd < 0) {
  80                 weston_log("opening input device '%s' failed.\n", devnode);
  81                 return 0;
  82         }
  83
  84         device = evdev_device_create(&seat->base, devnode, fd);
  85         if (device == EVDEV_UNHANDLED_DEVICE) {
  86                 close(fd);
  87                 weston_log("not using input device '%s'.\n", devnode);
  88                 return 0;
  89         } else if (device == NULL) {
  90                 close(fd);
  91                 weston_log("failed to create input device '%s'.\n", devnode);
  92                 return 0;
  93         }
  94
  95         calibration_values =
  96                 udev_device_get_property_value(udev_device,
  97                                                "WL_CALIBRATION");
  98
  99         if (calibration_values && sscanf(calibration_values,
 100                                          "%f %f %f %f %f %f",
 101                                          &device->abs.calibration[0],
 102                                          &device->abs.calibration[1],
 103                                          &device->abs.calibration[2],
 104                                          &device->abs.calibration[3],
 105                                          &device->abs.calibration[4],
 106                                          &device->abs.calibration[5]) == 6) {
 107                 device->abs.apply_calibration = 1;
 108                 weston_log ("Applying calibration: %f %f %f %f %f %f\n",
 109                             device->abs.calibration[0],
 110                             device->abs.calibration[1],
 111                             device->abs.calibration[2],
 112                             device->abs.calibration[3],
 113                             device->abs.calibration[4],
 114                             device->abs.calibration[5]);
 115         }
 116
 117         wl_list_insert(seat->devices_list.prev, &device->link);
 118
 119         if (seat->base.output && seat->base.pointer)
 120                 weston_pointer_clamp(seat->base.pointer,
 121                                      &seat->base.pointer->x,
 122                                      &seat->base.pointer->y);
 123
 124         output_name = udev_device_get_property_value(udev_device, "WL_OUTPUT");
 125         if (output_name) {
 126                 wl_list_for_each(output, &c->output_list, link)
 127                         if (strcmp(output->name, output_name) == 0)
 128                                 device->output = output;
 129         }
 130
 131         if (input->enabled == 1)
 132                 weston_seat_repick(&seat->base);
 133
 134         return 0;
 135 }
 136
 137 static int
 138 udev_input_add_devices(struct udev_input *input, struct udev *udev)
 139 {
 140         struct udev_enumerate *e;
 141         struct udev_list_entry *entry;
 142         struct udev_device *device;
 143         const char *path, *sysname;
 144         struct udev_seat *seat;
 145         int devices_found = 0;
 146
 147         e = udev_enumerate_new(udev);
 148         udev_enumerate_add_match_subsystem(e, "input");
 149         udev_enumerate_scan_devices(e);
 150         udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(e)) {
 151                 path = udev_list_entry_get_name(entry);
 152                 device = udev_device_new_from_syspath(udev, path);
 153
 154                 sysname = udev_device_get_sysname(device);
 155                 if (strncmp("event", sysname, 5) != 0) {
 156                         udev_device_unref(device);
 157                         continue;
 158                 }
 159
 160                 if (device_added(device, input) < 0) {
 161                         udev_device_unref(device);
 162                         udev_enumerate_unref(e);
 163                         return -1;
 164                 }
 165
 166                 udev_device_unref(device);
 167         }
 168         udev_enumerate_unref(e);
 169
 170         wl_list_for_each(seat, &input->compositor->seat_list, base.link) {
 171                 evdev_notify_keyboard_focus(&seat->base, &seat->devices_list);
 172
 173                 if (!wl_list_empty(&seat->devices_list))
 174                         devices_found = 1;
 175         }
 176
 177         if (devices_found == 0) {
 178                 weston_log(
 179                         "warning: no input devices on entering Weston. "
 180                         "Possible causes:\n"
 181                         "\t- no permissions to read /dev/input/event*\n"
 182                         "\t- seats misconfigured "
 183                         "(Weston backend option 'seat', "
 184                         "udev device property ID_SEAT)\n");
 185                 return -1;
 186         }
 187
 188         return 0;
 189 }
 190
 191 static int
 192 evdev_udev_handler(int fd, uint32_t mask, void *data)
 193 {
 194         struct udev_input *input = data;
 195         struct udev_device *udev_device;
 196         struct evdev_device *device, *next;
 197         const char *action;
 198         const char *devnode;
 199         struct udev_seat *seat;
 200
 201         udev_device = udev_monitor_receive_device(input->udev_monitor);
 202         if (!udev_device)
 203                 return 1;
 204
 205         action = udev_device_get_action(udev_device);
 206         if (!action)
 207                 goto out;
 208
 209         if (strncmp("event", udev_device_get_sysname(udev_device), 5) != 0)
 210                 goto out;
 211
 212         if (!strcmp(action, "add")) {
 213                 device_added(udev_device, input);
 214         }
 215         else if (!strcmp(action, "remove")) {
 216                 devnode = udev_device_get_devnode(udev_device);
 217                 wl_list_for_each(seat, &input->compositor->seat_list, base.link) {
 218                         wl_list_for_each_safe(device, next, &seat->devices_list, link)
 219                                 if (!strcmp(device->devnode, devnode)) {
 220                                         weston_log("input device %s, %s removed\n",
 221                                                         device->devname, device->devnode);
 222                                         evdev_device_destroy(device);
 223                                 break;
 224                         }
 225                 }
 226         }
 227
 228 out:
 229         udev_device_unref(udev_device);
 230
 231         return 0;
 232 }
 233
 234 int
 235 udev_input_enable(struct udev_input *input, struct udev *udev)
 236 {
 237         struct wl_event_loop *loop;
 238         struct weston_compositor *c = input->compositor;
 239         int fd;
 240
 241         input->udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
 242         if (!input->udev_monitor) {
 243                 weston_log("udev: failed to create the udev monitor\n");
 244                 return -1;
 245         }
 246
 247         udev_monitor_filter_add_match_subsystem_devtype(input->udev_monitor,
 248                         "input", NULL);
 249
 250         if (udev_monitor_enable_receiving(input->udev_monitor)) {
 251                 weston_log("udev: failed to bind the udev monitor\n");
 252                 udev_monitor_unref(input->udev_monitor);
 253                 return -1;
 254         }
 255
 256         loop = wl_display_get_event_loop(c->wl_display);
 257         fd = udev_monitor_get_fd(input->udev_monitor);
 258         input->udev_monitor_source =
 259                 wl_event_loop_add_fd(loop, fd, WL_EVENT_READABLE,
 260                                      evdev_udev_handler, input);
 261         if (!input->udev_monitor_source) {
 262                 udev_monitor_unref(input->udev_monitor);
 263                 return -1;
 264         }
 265
 266         if (udev_input_add_devices(input, udev) < 0)
 267                 return -1;
 268
 269         input->enabled = 1;
 270
 271         return 0;
 272 }
 273
 274 static void
 275 udev_input_remove_devices(struct udev_input *input)
 276 {
 277         struct evdev_device *device, *next;
 278         struct udev_seat *seat;
 279
 280         wl_list_for_each(seat, &input->compositor->seat_list, base.link) {
 281                 wl_list_for_each_safe(device, next, &seat->devices_list, link)
 282                         evdev_device_destroy(device);
 283
 284                 if (seat->base.keyboard)
 285                         notify_keyboard_focus_out(&seat->base);
 286         }
 287 }
 288
 289 void
 290 udev_input_disable(struct udev_input *input)
 291 {
 292         if (!input->udev_monitor)
 293                 return;
 294
 295         udev_monitor_unref(input->udev_monitor);
 296         input->udev_monitor = NULL;
 297         wl_event_source_remove(input->udev_monitor_source);
 298         input->udev_monitor_source = NULL;
 299
 300         udev_input_remove_devices(input);
 301 }
 302
 303
 304 int
 305 udev_input_init(struct udev_input *input, struct weston_compositor *c, struct udev *udev,
 306                 const char *seat_id)
 307 {
 308         memset(input, 0, sizeof *input);
 309         input->seat_id = strdup(seat_id);
 310         input->compositor = c;
 311         if (udev_input_enable(input, udev) < 0)
 312                 goto err;
 313
 314         return 0;
 315
 316  err:
 317         free(input->seat_id);
 318         return -1;
 319 }
 320
 321 void
 322 udev_input_destroy(struct udev_input *input)
 323 {
 324         struct udev_seat *seat, *next;
 325         udev_input_disable(input);
 326         wl_list_for_each_safe(seat, next, &input->compositor->seat_list, base.link)
 327                 udev_seat_destroy(seat);
 328         free(input->seat_id);
 329 }
 330
 331 static void
 332 drm_led_update(struct weston_seat *seat_base, enum weston_led leds)
 333 {
 334         struct udev_seat *seat = (struct udev_seat *) seat_base;
 335         struct evdev_device *device;
 336
 337         wl_list_for_each(device, &seat->devices_list, link)
 338                 evdev_led_update(device, leds);
 339 }
 340
 341 static struct udev_seat *
 342 udev_seat_create(struct weston_compositor *c, const char *seat_name)
 343 {
 344         struct udev_seat *seat;
 345
 346         seat = zalloc(sizeof *seat);
 347
 348         if (!seat)
 349                 return NULL;
 350         weston_seat_init(&seat->base, c, seat_name);
 351         seat->base.led_update = drm_led_update;
 352
 353         wl_list_init(&seat->devices_list);
 354         return seat;
 355 }
 356
 357 static void
 358 udev_seat_destroy(struct udev_seat *seat)
 359 {
 360         weston_seat_release(&seat->base);
 361         free(seat);
 362 }
 363
 364 struct udev_seat *
 365 udev_seat_get_named(struct weston_compositor *c, const char *seat_name)
 366 {
 367         struct udev_seat *seat;
 368
 369         wl_list_for_each(seat, &c->seat_list, base.link) {
 370                 if (strcmp(seat->base.seat_name, seat_name) == 0)
 371                         return seat;
 372         }
 373
 374         seat = udev_seat_create(c, seat_name);
 375
 376         if (!seat)
 377                 return NULL;
 378
 379         return seat;
 380 }