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                 }
 207                 libinput_seat_unref(&seat->base);
 208         }
 209 }
 210
 211
 212 static void
 213 udev_input_disable(struct libinput *libinput)
 214 {
 215         struct udev_input *input = (struct udev_input*)libinput;
 216
 217         if (!input->udev_monitor)
 218                 return;
 219
 220         udev_monitor_unref(input->udev_monitor);
 221         input->udev_monitor = NULL;
 222         libinput_remove_source(&input->base, input->udev_monitor_source);
 223         input->udev_monitor_source = NULL;
 224
 225         udev_input_remove_devices(input);
 226 }
 227
 228 static int
 229 udev_input_enable(struct libinput *libinput)
 230 {
 231         struct udev_input *input = (struct udev_input*)libinput;
 232         struct udev *udev = input->udev;
 233         int fd;
 234
 235         if (input->udev_monitor)
 236                 return 0;
 237
 238         input->udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
 239         if (!input->udev_monitor) {
 240                 log_info("udev: failed to create the udev monitor\n");
 241                 return -1;
 242         }
 243
 244         udev_monitor_filter_add_match_subsystem_devtype(input->udev_monitor,
 245                         "input", NULL);
 246
 247         if (udev_monitor_enable_receiving(input->udev_monitor)) {
 248                 log_info("udev: failed to bind the udev monitor\n");
 249                 udev_monitor_unref(input->udev_monitor);
 250                 input->udev_monitor = NULL;
 251                 return -1;
 252         }
 253
 254         fd = udev_monitor_get_fd(input->udev_monitor);
 255         input->udev_monitor_source = libinput_add_fd(&input->base,
 256                                                      fd,
 257                                                      evdev_udev_handler,
 258                                                      input);
 259         if (!input->udev_monitor_source) {
 260                 udev_monitor_unref(input->udev_monitor);
 261                 input->udev_monitor = NULL;
 262                 return -1;
 263         }
 264
 265         if (udev_input_add_devices(input, udev) < 0) {
 266                 udev_input_disable(libinput);
 267                 return -1;
 268         }
 269
 270         return 0;
 271 }
 272
 273 static void
 274 udev_input_destroy(struct libinput *input)
 275 {
 276         struct udev_input *udev_input = (struct udev_input*)input;
 277
 278         if (input == NULL)
 279                 return;
 280
 281         udev_unref(udev_input->udev);
 282         free(udev_input->seat_id);
 283 }
 284
 285 static void
 286 udev_seat_destroy(struct libinput_seat *seat)
 287 {
 288         struct udev_seat *useat = (struct udev_seat*)seat;
 289         free(useat);
 290 }
 291
 292 static struct udev_seat *
 293 udev_seat_create(struct udev_input *input,
 294                  const char *device_seat,
 295                  const char *seat_name)
 296 {
 297         struct udev_seat *seat;
 298
 299         seat = zalloc(sizeof *seat);
 300         if (!seat)
 301                 return NULL;
 302
 303         libinput_seat_init(&seat->base, &input->base,
 304                            device_seat, seat_name,
 305                            udev_seat_destroy);
 306
 307         return seat;
 308 }
 309
 310 static struct udev_seat *
 311 udev_seat_get_named(struct udev_input *input, const char *seat_name)
 312 {
 313         struct udev_seat *seat;
 314
 315         list_for_each(seat, &input->base.seat_list, base.link) {
 316                 if (strcmp(seat->base.logical_name, seat_name) == 0)
 317                         return seat;
 318         }
 319
 320         return NULL;
 321 }
 322
 323 static const struct libinput_interface_backend interface_backend = {
 324         .resume = udev_input_enable,
 325         .suspend = udev_input_disable,
 326         .destroy = udev_input_destroy,
 327 };
 328
 329 LIBINPUT_EXPORT struct libinput *
 330 libinput_udev_create_for_seat(const struct libinput_interface *interface,
 331                               void *user_data,
 332                               struct udev *udev,
 333                               const char *seat_id)
 334 {
 335         struct udev_input *input;
 336
 337         if (!interface || !udev || !seat_id)
 338                 return NULL;
 339
 340         input = zalloc(sizeof *input);
 341         if (!input)
 342                 return NULL;
 343
 344         if (libinput_init(&input->base, interface,
 345                           &interface_backend, user_data) != 0) {
 346                 free(input);
 347                 return NULL;
 348         }
 349
 350         input->udev = udev_ref(udev);
 351         input->seat_id = strdup(seat_id);
 352
 353         if (udev_input_enable(&input->base) < 0) {
 354                 udev_unref(udev);
 355                 libinput_destroy(&input->base);
 356                 free(input);
 357                 return NULL;
 358         }
 359
 360         return &input->base;
 361 }