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
 220 static void
 221 udev_input_disable(struct libinput *libinput)
 222 {
 223         struct udev_input *input = (struct udev_input*)libinput;
 224
 225         if (!input->udev_monitor)
 226                 return;
 227
 228         udev_monitor_unref(input->udev_monitor);
 229         input->udev_monitor = NULL;
 230         libinput_remove_source(&input->base, input->udev_monitor_source);
 231         input->udev_monitor_source = NULL;
 232
 233         udev_input_remove_devices(input);
 234 }
 235
 236 static int
 237 udev_input_enable(struct libinput *libinput)
 238 {
 239         struct udev_input *input = (struct udev_input*)libinput;
 240         struct udev *udev = input->udev;
 241         int fd;
 242
 243         if (input->udev_monitor)
 244                 return 0;
 245
 246         input->udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
 247         if (!input->udev_monitor) {
 248                 log_info(libinput,
 249                          "udev: failed to create the udev monitor\n");
 250                 return -1;
 251         }
 252
 253         udev_monitor_filter_add_match_subsystem_devtype(input->udev_monitor,
 254                         "input", NULL);
 255
 256         if (udev_monitor_enable_receiving(input->udev_monitor)) {
 257                 log_info(libinput, "udev: failed to bind the udev monitor\n");
 258                 udev_monitor_unref(input->udev_monitor);
 259                 input->udev_monitor = NULL;
 260                 return -1;
 261         }
 262
 263         fd = udev_monitor_get_fd(input->udev_monitor);
 264         input->udev_monitor_source = libinput_add_fd(&input->base,
 265                                                      fd,
 266                                                      evdev_udev_handler,
 267                                                      input);
 268         if (!input->udev_monitor_source) {
 269                 udev_monitor_unref(input->udev_monitor);
 270                 input->udev_monitor = NULL;
 271                 return -1;
 272         }
 273
 274         if (udev_input_add_devices(input, udev) < 0) {
 275                 udev_input_disable(libinput);
 276                 return -1;
 277         }
 278
 279         return 0;
 280 }
 281
 282 static void
 283 udev_input_destroy(struct libinput *input)
 284 {
 285         struct udev_input *udev_input = (struct udev_input*)input;
 286
 287         if (input == NULL)
 288                 return;
 289
 290         udev_unref(udev_input->udev);
 291         free(udev_input->seat_id);
 292 }
 293
 294 static void
 295 udev_seat_destroy(struct libinput_seat *seat)
 296 {
 297         struct udev_seat *useat = (struct udev_seat*)seat;
 298         free(useat);
 299 }
 300
 301 static struct udev_seat *
 302 udev_seat_create(struct udev_input *input,
 303                  const char *device_seat,
 304                  const char *seat_name)
 305 {
 306         struct udev_seat *seat;
 307
 308         seat = zalloc(sizeof *seat);
 309         if (!seat)
 310                 return NULL;
 311
 312         libinput_seat_init(&seat->base, &input->base,
 313                            device_seat, seat_name,
 314                            udev_seat_destroy);
 315
 316         return seat;
 317 }
 318
 319 static struct udev_seat *
 320 udev_seat_get_named(struct udev_input *input, const char *seat_name)
 321 {
 322         struct udev_seat *seat;
 323
 324         list_for_each(seat, &input->base.seat_list, base.link) {
 325                 if (strcmp(seat->base.logical_name, seat_name) == 0)
 326                         return seat;
 327         }
 328
 329         return NULL;
 330 }
 331
 332 static const struct libinput_interface_backend interface_backend = {
 333         .resume = udev_input_enable,
 334         .suspend = udev_input_disable,
 335         .destroy = udev_input_destroy,
 336 };
 337
 338 LIBINPUT_EXPORT struct libinput *
 339 libinput_udev_create_context(const struct libinput_interface *interface,
 340                              void *user_data,
 341                              struct udev *udev)
 342 {
 343         struct udev_input *input;
 344
 345         if (!interface || !udev)
 346                 return NULL;
 347
 348         input = zalloc(sizeof *input);
 349         if (!input)
 350                 return NULL;
 351
 352         if (libinput_init(&input->base, interface,
 353                           &interface_backend, user_data) != 0) {
 354                 libinput_unref(&input->base);
 355                 free(input);
 356                 return NULL;
 357         }
 358
 359         input->udev = udev_ref(udev);
 360
 361         return &input->base;
 362 }
 363
 364 LIBINPUT_EXPORT int
 365 libinput_udev_assign_seat(struct libinput *libinput,
 366                           const char *seat_id)
 367 {
 368         struct udev_input *input = (struct udev_input*)libinput;
 369
 370         if (!seat_id)
 371                 return -1;
 372         if (input->seat_id != NULL)
 373                 return -1;
 374
 375         if (libinput->interface_backend != &interface_backend) {
 376                 log_bug_client(libinput, "Mismatching backends.\n");
 377                 return -1;
 378         }
 379
 380         input->seat_id = strdup(seat_id);
 381
 382         if (udev_input_enable(&input->base) < 0)
 383                 return -1;
 384
 385         return 0;
 386 }