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, const char *seat_name);
  39 static struct udev_seat *
  40 udev_seat_get_named(struct udev_input *input, const char *seat_name);
  41
  42 static int
  43 device_added(struct udev_device *udev_device, struct udev_input *input)
  44 {
  45         struct libinput *libinput = &input->base;
  46         struct evdev_device *device;
  47         const char *devnode;
  48         const char *sysname;
  49         const char *device_seat, *seat_name, *output_name;
  50         const char *calibration_values;
  51         int fd;
  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 == NULL)
  72                 return -1;
  73
  74         /* Use non-blocking mode so that we can loop on read on
  75          * evdev_device_data() until all events on the fd are
  76          * read.  mtdev_get() also expects this. */
  77         fd = open_restricted(libinput, devnode, O_RDWR | O_NONBLOCK);
  78         if (fd < 0) {
  79                 log_info("opening input device '%s' failed (%s).\n", devnode, strerror(-fd));
  80                 return 0;
  81         }
  82
  83         device = evdev_device_create(&seat->base, devnode, sysname, fd);
  84         if (device == EVDEV_UNHANDLED_DEVICE) {
  85                 close_restricted(libinput, fd);
  86                 log_info("not using input device '%s'.\n", devnode);
  87                 return 0;
  88         } else if (device == NULL) {
  89                 close_restricted(libinput, fd);
  90                 log_info("failed to create input device '%s'.\n", devnode);
  91                 return 0;
  92         }
  93
  94         calibration_values =
  95                 udev_device_get_property_value(udev_device,
  96                                                "WL_CALIBRATION");
  97
  98         if (calibration_values && sscanf(calibration_values,
  99                                          "%f %f %f %f %f %f",
 100                                          &device->abs.calibration[0],
 101                                          &device->abs.calibration[1],
 102                                          &device->abs.calibration[2],
 103                                          &device->abs.calibration[3],
 104                                          &device->abs.calibration[4],
 105                                          &device->abs.calibration[5]) == 6) {
 106                 device->abs.apply_calibration = 1;
 107                 log_info("Applying calibration: %f %f %f %f %f %f\n",
 108                          device->abs.calibration[0],
 109                          device->abs.calibration[1],
 110                          device->abs.calibration[2],
 111                          device->abs.calibration[3],
 112                          device->abs.calibration[4],
 113                          device->abs.calibration[5]);
 114         }
 115
 116         output_name = udev_device_get_property_value(udev_device, "WL_OUTPUT");
 117         if (output_name)
 118                 device->output_name = strdup(output_name);
 119
 120         return 0;
 121 }
 122
 123 static int
 124 udev_input_add_devices(struct udev_input *input, struct udev *udev)
 125 {
 126         struct udev_enumerate *e;
 127         struct udev_list_entry *entry;
 128         struct udev_device *device;
 129         const char *path, *sysname;
 130
 131         e = udev_enumerate_new(udev);
 132         udev_enumerate_add_match_subsystem(e, "input");
 133         udev_enumerate_scan_devices(e);
 134         udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(e)) {
 135                 path = udev_list_entry_get_name(entry);
 136                 device = udev_device_new_from_syspath(udev, path);
 137
 138                 sysname = udev_device_get_sysname(device);
 139                 if (strncmp("event", sysname, 5) != 0) {
 140                         udev_device_unref(device);
 141                         continue;
 142                 }
 143
 144                 if (device_added(device, input) < 0) {
 145                         udev_device_unref(device);
 146                         udev_enumerate_unref(e);
 147                         return -1;
 148                 }
 149
 150                 udev_device_unref(device);
 151         }
 152         udev_enumerate_unref(e);
 153
 154         return 0;
 155 }
 156
 157 static void
 158 evdev_udev_handler(void *data)
 159 {
 160         struct udev_input *input = data;
 161         struct libinput *libinput = &input->base;
 162         struct udev_device *udev_device;
 163         struct evdev_device *device, *next;
 164         const char *action;
 165         const char *devnode;
 166         struct udev_seat *seat;
 167
 168         udev_device = udev_monitor_receive_device(input->udev_monitor);
 169         if (!udev_device)
 170                 return;
 171
 172         action = udev_device_get_action(udev_device);
 173         if (!action)
 174                 goto out;
 175
 176         if (strncmp("event", udev_device_get_sysname(udev_device), 5) != 0)
 177                 goto out;
 178
 179         if (!strcmp(action, "add")) {
 180                 device_added(udev_device, input);
 181         }
 182         else if (!strcmp(action, "remove")) {
 183                 devnode = udev_device_get_devnode(udev_device);
 184                 list_for_each(seat, &input->base.seat_list, base.link) {
 185                         list_for_each_safe(device, next,
 186                                            &seat->base.devices_list, base.link)
 187                                 if (!strcmp(device->devnode, devnode)) {
 188                                         log_info("input device %s, %s removed\n",
 189                                                  device->devname, device->devnode);
 190                                         close_restricted(libinput, device->fd);
 191                                         evdev_device_remove(device);
 192                                         break;
 193                                 }
 194                 }
 195         }
 196
 197 out:
 198         udev_device_unref(udev_device);
 199 }
 200
 201 static void
 202 udev_input_remove_devices(struct udev_input *input)
 203 {
 204         struct evdev_device *device, *next;
 205         struct udev_seat *seat;
 206
 207         list_for_each(seat, &input->base.seat_list, base.link) {
 208                 list_for_each_safe(device, next,
 209                                    &seat->base.devices_list, base.link) {
 210                         close_restricted(&input->base, device->fd);
 211                         evdev_device_remove(device);
 212                 }
 213         }
 214 }
 215
 216
 217 static void
 218 udev_input_disable(struct libinput *libinput)
 219 {
 220         struct udev_input *input = (struct udev_input*)libinput;
 221
 222         if (!input->udev_monitor)
 223                 return;
 224
 225         udev_monitor_unref(input->udev_monitor);
 226         input->udev_monitor = NULL;
 227         libinput_remove_source(&input->base, input->udev_monitor_source);
 228         input->udev_monitor_source = NULL;
 229
 230         udev_input_remove_devices(input);
 231 }
 232
 233 static int
 234 udev_input_enable(struct libinput *libinput)
 235 {
 236         struct udev_input *input = (struct udev_input*)libinput;
 237         struct udev *udev = input->udev;
 238         int fd;
 239
 240         if (input->udev_monitor)
 241                 return 0;
 242
 243         input->udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
 244         if (!input->udev_monitor) {
 245                 log_info("udev: failed to create the udev monitor\n");
 246                 return -1;
 247         }
 248
 249         udev_monitor_filter_add_match_subsystem_devtype(input->udev_monitor,
 250                         "input", NULL);
 251
 252         if (udev_monitor_enable_receiving(input->udev_monitor)) {
 253                 log_info("udev: failed to bind the udev monitor\n");
 254                 udev_monitor_unref(input->udev_monitor);
 255                 input->udev_monitor = NULL;
 256                 return -1;
 257         }
 258
 259         fd = udev_monitor_get_fd(input->udev_monitor);
 260         input->udev_monitor_source = libinput_add_fd(&input->base,
 261                                                      fd,
 262                                                      evdev_udev_handler,
 263                                                      input);
 264         if (!input->udev_monitor_source) {
 265                 udev_monitor_unref(input->udev_monitor);
 266                 input->udev_monitor = NULL;
 267                 return -1;
 268         }
 269
 270         if (udev_input_add_devices(input, udev) < 0) {
 271                 udev_input_disable(libinput);
 272                 return -1;
 273         }
 274
 275         return 0;
 276 }
 277
 278 static void
 279 udev_input_destroy(struct libinput *input)
 280 {
 281         struct libinput_seat *seat, *next;
 282         struct udev_input *udev_input = (struct udev_input*)input;
 283
 284         if (input == NULL)
 285                 return;
 286
 287         udev_input_disable(input);
 288         list_for_each_safe(seat, next, &input->seat_list, link) {
 289                 libinput_seat_unref(seat);
 290         }
 291         udev_unref(udev_input->udev);
 292         free(udev_input->seat_id);
 293 }
 294
 295 static void
 296 udev_seat_destroy(struct libinput_seat *seat)
 297 {
 298         struct udev_seat *useat = (struct udev_seat*)seat;
 299         free(useat);
 300 }
 301
 302 static struct udev_seat *
 303 udev_seat_create(struct udev_input *input, 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, seat_name, udev_seat_destroy);
 312         list_insert(&input->base.seat_list, &seat->base.link);
 313         notify_added_seat(&seat->base);
 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.name, seat_name) == 0)
 325                         return seat;
 326         }
 327
 328         seat = udev_seat_create(input, seat_name);
 329
 330         if (!seat)
 331                 return NULL;
 332
 333         return seat;
 334 }
 335
 336 static const struct libinput_interface_backend interface_backend = {
 337         .resume = udev_input_enable,
 338         .suspend = udev_input_disable,
 339         .destroy = udev_input_destroy,
 340 };
 341
 342 LIBINPUT_EXPORT struct libinput *
 343 libinput_create_from_udev(const struct libinput_interface *interface,
 344                           void *user_data,
 345                           struct udev *udev,
 346                           const char *seat_id)
 347 {
 348         struct udev_input *input;
 349
 350         if (!interface || !udev || !seat_id)
 351                 return NULL;
 352
 353         input = zalloc(sizeof *input);
 354         if (!input)
 355                 return NULL;
 356
 357         if (libinput_init(&input->base, interface,
 358                           &interface_backend, user_data) != 0) {
 359                 free(input);
 360                 return NULL;
 361         }
 362
 363         input->udev = udev_ref(udev);
 364         input->seat_id = strdup(seat_id);
 365
 366         if (udev_input_enable(&input->base) < 0) {
 367                 udev_unref(udev);
 368                 libinput_destroy(&input->base);
 369                 free(input);
 370                 return NULL;
 371         }
 372
 373         return &input->base;
 374 }