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 <stdio.h>
  27 #include <string.h>
  28 #include <unistd.h>
  29 #include <fcntl.h>
  30
  31 #include "evdev.h"
  32 #include "udev-seat.h"
  33
  34 static const char default_seat[] = "seat0";
  35 static const char default_seat_name[] = "default";
  36
  37 static struct udev_seat *
  38 udev_seat_create(struct udev_input *input,
  39                  const char *device_seat,
  40                  const char *seat_name);
  41 static struct udev_seat *
  42 udev_seat_get_named(struct udev_input *input, const char *seat_name);
  43
  44 static int
  45 device_added(struct udev_device *udev_device, struct udev_input *input)
  46 {
  47         struct evdev_device *device;
  48         const char *devnode;
  49         const char *sysname;
  50         const char *device_seat, *seat_name, *output_name;
  51         const char *calibration_values;
  52         struct udev_seat *seat;
  53
  54         device_seat = udev_device_get_property_value(udev_device, "ID_SEAT");
  55         if (!device_seat)
  56                 device_seat = default_seat;
  57
  58         if (strcmp(device_seat, input->seat_id))
  59                 return 0;
  60
  61         devnode = udev_device_get_devnode(udev_device);
  62         sysname = udev_device_get_sysname(udev_device);
  63
  64         /* Search for matching logical seat */
  65         seat_name = udev_device_get_property_value(udev_device, "WL_SEAT");
  66         if (!seat_name)
  67                 seat_name = default_seat_name;
  68
  69         seat = udev_seat_get_named(input, seat_name);
  70
  71         if (seat)
  72                 libinput_seat_ref(&seat->base);
  73         else {
  74                 seat = udev_seat_create(input, device_seat, seat_name);
  75                 if (!seat)
  76                         return -1;
  77         }
  78
  79         device = evdev_device_create(&seat->base, devnode, sysname);
  80         libinput_seat_unref(&seat->base);
  81
  82         if (device == EVDEV_UNHANDLED_DEVICE) {
  83                 log_info(&input->base, "not using input device '%s'.\n", devnode);
  84                 return 0;
  85         } else if (device == NULL) {
  86                 log_info(&input->base, "failed to create input device '%s'.\n", devnode);
  87                 return 0;
  88         }
  89
  90         calibration_values =
  91                 udev_device_get_property_value(udev_device,
  92                                                "WL_CALIBRATION");
  93
  94         if (calibration_values && sscanf(calibration_values,
  95                                          "%f %f %f %f %f %f",
  96                                          &device->abs.calibration[0],
  97                                          &device->abs.calibration[1],
  98                                          &device->abs.calibration[2],
  99                                          &device->abs.calibration[3],
 100                                          &device->abs.calibration[4],
 101                                          &device->abs.calibration[5]) == 6) {
 102                 device->abs.apply_calibration = 1;
 103                 log_info(&input->base,
 104                          "Applying calibration: %f %f %f %f %f %f\n",
 105                          device->abs.calibration[0],
 106                          device->abs.calibration[1],
 107                          device->abs.calibration[2],
 108                          device->abs.calibration[3],
 109                          device->abs.calibration[4],
 110                          device->abs.calibration[5]);
 111         }
 112
 113         output_name = udev_device_get_property_value(udev_device, "WL_OUTPUT");
 114         if (output_name)
 115                 device->output_name = strdup(output_name);
 116
 117         return 0;
 118 }
 119
 120 static void
 121 device_removed(struct udev_device *udev_device, struct udev_input *input)
 122 {
 123         const char *devnode;
 124         struct evdev_device *device, *next;
 125         struct udev_seat *seat;
 126
 127         devnode = udev_device_get_devnode(udev_device);
 128         list_for_each(seat, &input->base.seat_list, base.link) {
 129                 list_for_each_safe(device, next,
 130                                    &seat->base.devices_list, base.link) {
 131                         if (!strcmp(device->devnode, devnode)) {
 132                                 log_info(&input->base,
 133                                          "input device %s, %s removed\n",
 134                                          device->devname, device->devnode);
 135                                 evdev_device_remove(device);
 136                                 break;
 137                         }
 138                 }
 139         }
 140 }
 141
 142 static int
 143 udev_input_add_devices(struct udev_input *input, struct udev *udev)
 144 {
 145         struct udev_enumerate *e;
 146         struct udev_list_entry *entry;
 147         struct udev_device *device;
 148         const char *path, *sysname;
 149
 150         e = udev_enumerate_new(udev);
 151         udev_enumerate_add_match_subsystem(e, "input");
 152         udev_enumerate_scan_devices(e);
 153         udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(e)) {
 154                 path = udev_list_entry_get_name(entry);
 155                 device = udev_device_new_from_syspath(udev, path);
 156
 157                 sysname = udev_device_get_sysname(device);
 158                 if (strncmp("event", sysname, 5) != 0) {
 159                         udev_device_unref(device);
 160                         continue;
 161                 }
 162
 163                 if (device_added(device, input) < 0) {
 164                         udev_device_unref(device);
 165                         udev_enumerate_unref(e);
 166                         return -1;
 167                 }
 168
 169                 udev_device_unref(device);
 170         }
 171         udev_enumerate_unref(e);
 172
 173         return 0;
 174 }
 175
 176 static void
 177 evdev_udev_handler(void *data)
 178 {
 179         struct udev_input *input = data;
 180         struct udev_device *udev_device;
 181         const char *action;
 182
 183         udev_device = udev_monitor_receive_device(input->udev_monitor);
 184         if (!udev_device)
 185                 return;
 186
 187         action = udev_device_get_action(udev_device);
 188         if (!action)
 189                 goto out;
 190
 191         if (strncmp("event", udev_device_get_sysname(udev_device), 5) != 0)
 192                 goto out;
 193
 194         if (!strcmp(action, "add"))
 195                 device_added(udev_device, input);
 196         else if (!strcmp(action, "remove"))
 197                 device_removed(udev_device, input);
 198
 199 out:
 200         udev_device_unref(udev_device);
 201 }
 202
 203 static void
 204 udev_input_remove_devices(struct udev_input *input)
 205 {
 206         struct evdev_device *device, *next;
 207         struct udev_seat *seat, *tmp;
 208
 209         list_for_each_safe(seat, tmp, &input->base.seat_list, base.link) {
 210                 libinput_seat_ref(&seat->base);
 211                 list_for_each_safe(device, next,
 212                                    &seat->base.devices_list, base.link) {
 213                         evdev_device_remove(device);
 214                 }
 215                 libinput_seat_unref(&seat->base);
 216         }
 217 }
 218
 219 static void
 220 udev_input_disable(struct libinput *libinput)
 221 {
 222         struct udev_input *input = (struct udev_input*)libinput;
 223
 224         if (!input->udev_monitor)
 225                 return;
 226
 227         udev_monitor_unref(input->udev_monitor);
 228         input->udev_monitor = NULL;
 229         libinput_remove_source(&input->base, input->udev_monitor_source);
 230         input->udev_monitor_source = NULL;
 231
 232         udev_input_remove_devices(input);
 233 }
 234
 235 static int
 236 udev_input_enable(struct libinput *libinput)
 237 {
 238         struct udev_input *input = (struct udev_input*)libinput;
 239         struct udev *udev = input->udev;
 240         int fd;
 241
 242         if (input->udev_monitor)
 243                 return 0;
 244
 245         input->udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
 246         if (!input->udev_monitor) {
 247                 log_info(libinput,
 248                          "udev: failed to create the udev monitor\n");
 249                 return -1;
 250         }
 251
 252         udev_monitor_filter_add_match_subsystem_devtype(input->udev_monitor,
 253                         "input", NULL);
 254
 255         if (udev_monitor_enable_receiving(input->udev_monitor)) {
 256                 log_info(libinput, "udev: failed to bind the udev monitor\n");
 257                 udev_monitor_unref(input->udev_monitor);
 258                 input->udev_monitor = NULL;
 259                 return -1;
 260         }
 261
 262         fd = udev_monitor_get_fd(input->udev_monitor);
 263         input->udev_monitor_source = libinput_add_fd(&input->base,
 264                                                      fd,
 265                                                      evdev_udev_handler,
 266                                                      input);
 267         if (!input->udev_monitor_source) {
 268                 udev_monitor_unref(input->udev_monitor);
 269                 input->udev_monitor = NULL;
 270                 return -1;
 271         }
 272
 273         if (udev_input_add_devices(input, udev) < 0) {
 274                 udev_input_disable(libinput);
 275                 return -1;
 276         }
 277
 278         return 0;
 279 }
 280
 281 static void
 282 udev_input_destroy(struct libinput *input)
 283 {
 284         struct udev_input *udev_input = (struct udev_input*)input;
 285
 286         if (input == NULL)
 287                 return;
 288
 289         udev_unref(udev_input->udev);
 290         free(udev_input->seat_id);
 291 }
 292
 293 static void
 294 udev_seat_destroy(struct libinput_seat *seat)
 295 {
 296         struct udev_seat *useat = (struct udev_seat*)seat;
 297         free(useat);
 298 }
 299
 300 static struct udev_seat *
 301 udev_seat_create(struct udev_input *input,
 302                  const char *device_seat,
 303                  const char *seat_name)
 304 {
 305         struct udev_seat *seat;
 306
 307         seat = zalloc(sizeof *seat);
 308         if (!seat)
 309                 return NULL;
 310
 311         libinput_seat_init(&seat->base, &input->base,
 312                            device_seat, seat_name,
 313                            udev_seat_destroy);
 314
 315         return seat;
 316 }
 317
 318 static struct udev_seat *
 319 udev_seat_get_named(struct udev_input *input, const char *seat_name)
 320 {
 321         struct udev_seat *seat;
 322
 323         list_for_each(seat, &input->base.seat_list, base.link) {
 324                 if (strcmp(seat->base.logical_name, seat_name) == 0)
 325                         return seat;
 326         }
 327
 328         return NULL;
 329 }
 330
 331 static const struct libinput_interface_backend interface_backend = {
 332         .resume = udev_input_enable,
 333         .suspend = udev_input_disable,
 334         .destroy = udev_input_destroy,
 335 };
 336
 337 LIBINPUT_EXPORT struct libinput *
 338 libinput_udev_create_context(const struct libinput_interface *interface,
 339                              void *user_data,
 340                              struct udev *udev)
 341 {
 342         struct udev_input *input;
 343
 344         if (!interface || !udev)
 345                 return NULL;
 346
 347         input = zalloc(sizeof *input);
 348         if (!input)
 349                 return NULL;
 350
 351         if (libinput_init(&input->base, interface,
 352                           &interface_backend, user_data) != 0) {
 353                 libinput_unref(&input->base);
 354                 free(input);
 355                 return NULL;
 356         }
 357
 358         input->udev = udev_ref(udev);
 359
 360         return &input->base;
 361 }
 362
 363 LIBINPUT_EXPORT int
 364 libinput_udev_assign_seat(struct libinput *libinput,
 365                           const char *seat_id)
 366 {
 367         struct udev_input *input = (struct udev_input*)libinput;
 368
 369         if (!seat_id)
 370                 return -1;
 371         if (input->seat_id != NULL)
 372                 return -1;
 373
 374         if (libinput->interface_backend != &interface_backend) {
 375                 log_bug_client(libinput, "Mismatching backends.\n");
 376                 return -1;
 377         }
 378
 379         input->seat_id = strdup(seat_id);
 380
 381         if (udev_input_enable(&input->base) < 0)
 382                 return -1;
 383
 384         return 0;
 385 }