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("not using input device '%s'.\n", devnode);
  84                 return 0;
  85         } else if (device == NULL) {
  86                 log_info("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("Applying calibration: %f %f %f %f %f %f\n",
 104                          device->abs.calibration[0],
 105                          device->abs.calibration[1],
 106                          device->abs.calibration[2],
 107                          device->abs.calibration[3],
 108                          device->abs.calibration[4],
 109                          device->abs.calibration[5]);
 110         }
 111
 112         output_name = udev_device_get_property_value(udev_device, "WL_OUTPUT");
 113         if (output_name)
 114                 device->output_name = strdup(output_name);
 115
 116         return 0;
 117 }
 118
 119 static int
 120 udev_input_add_devices(struct udev_input *input, struct udev *udev)
 121 {
 122         struct udev_enumerate *e;
 123         struct udev_list_entry *entry;
 124         struct udev_device *device;
 125         const char *path, *sysname;
 126
 127         e = udev_enumerate_new(udev);
 128         udev_enumerate_add_match_subsystem(e, "input");
 129         udev_enumerate_scan_devices(e);
 130         udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(e)) {
 131                 path = udev_list_entry_get_name(entry);
 132                 device = udev_device_new_from_syspath(udev, path);
 133
 134                 sysname = udev_device_get_sysname(device);
 135                 if (strncmp("event", sysname, 5) != 0) {
 136                         udev_device_unref(device);
 137                         continue;
 138                 }
 139
 140                 if (device_added(device, input) < 0) {
 141                         udev_device_unref(device);
 142                         udev_enumerate_unref(e);
 143                         return -1;
 144                 }
 145
 146                 udev_device_unref(device);
 147         }
 148         udev_enumerate_unref(e);
 149
 150         return 0;
 151 }
 152
 153 static void
 154 evdev_udev_handler(void *data)
 155 {
 156         struct udev_input *input = data;
 157         struct udev_device *udev_device;
 158         struct evdev_device *device, *next;
 159         const char *action;
 160         const char *devnode;
 161         struct udev_seat *seat;
 162
 163         udev_device = udev_monitor_receive_device(input->udev_monitor);
 164         if (!udev_device)
 165                 return;
 166
 167         action = udev_device_get_action(udev_device);
 168         if (!action)
 169                 goto out;
 170
 171         if (strncmp("event", udev_device_get_sysname(udev_device), 5) != 0)
 172                 goto out;
 173
 174         if (!strcmp(action, "add")) {
 175                 device_added(udev_device, input);
 176         }
 177         else if (!strcmp(action, "remove")) {
 178                 devnode = udev_device_get_devnode(udev_device);
 179                 list_for_each(seat, &input->base.seat_list, base.link) {
 180                         list_for_each_safe(device, next,
 181                                            &seat->base.devices_list, base.link)
 182                                 if (!strcmp(device->devnode, devnode)) {
 183                                         log_info("input device %s, %s removed\n",
 184                                                  device->devname, device->devnode);
 185                                         evdev_device_remove(device);
 186                                         break;
 187                                 }
 188                 }
 189         }
 190
 191 out:
 192         udev_device_unref(udev_device);
 193 }
 194
 195 static void
 196 udev_input_remove_devices(struct udev_input *input)
 197 {
 198         struct evdev_device *device, *next;
 199         struct udev_seat *seat, *tmp;
 200
 201         list_for_each_safe(seat, tmp, &input->base.seat_list, base.link) {
 202                 libinput_seat_ref(&seat->base);
 203                 list_for_each_safe(device, next,
 204                                    &seat->base.devices_list, base.link) {
 205                         evdev_device_remove(device);
 206                         if (list_empty(&seat->base.devices_list)) {
 207                                 /* if the seat may be referenced by the
 208                                    client, so make sure it's dropped from
 209                                    the seat list now, to be freed whenever
 210                                  * the device is removed */
 211                                 list_remove(&seat->base.link);
 212                                 list_init(&seat->base.link);
 213                         }
 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("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("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         list_insert(&input->base.seat_list, &seat->base.link);
 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_create_from_udev(const struct libinput_interface *interface,
 340                           void *user_data,
 341                           struct udev *udev,
 342                           const char *seat_id)
 343 {
 344         struct udev_input *input;
 345
 346         if (!interface || !udev || !seat_id)
 347                 return NULL;
 348
 349         input = zalloc(sizeof *input);
 350         if (!input)
 351                 return NULL;
 352
 353         if (libinput_init(&input->base, interface,
 354                           &interface_backend, user_data) != 0) {
 355                 free(input);
 356                 return NULL;
 357         }
 358
 359         input->udev = udev_ref(udev);
 360         input->seat_id = strdup(seat_id);
 361
 362         if (udev_input_enable(&input->base) < 0) {
 363                 udev_unref(udev);
 364                 libinput_destroy(&input->base);
 365                 free(input);
 366                 return NULL;
 367         }
 368
 369         return &input->base;
 370 }