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 <string.h>
  27 #include <unistd.h>
  28 #include <fcntl.h>
  29
  30 #include "compositor.h"
  31 #include "launcher-util.h"
  32 #include "evdev.h"
  33 #include "udev-seat.h"
  34
  35 static const char default_seat[] = "seat0";
  36 static const char default_seat_name[] = "default";
  37
  38 static struct udev_seat *
  39 udev_seat_create(struct weston_compositor *c, const char *seat_name);
  40 static void
  41 udev_seat_destroy(struct udev_seat *seat);
  42
  43 static int
  44 device_added(struct udev_device *udev_device, struct udev_input *input)
  45 {
  46         struct weston_compositor *c;
  47         struct evdev_device *device;
  48         const char *devnode;
  49         const char *device_seat, *seat_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         c = input->compositor;
  62         devnode = udev_device_get_devnode(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(c, 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 = weston_launcher_open(c, devnode, O_RDWR | O_NONBLOCK);
  78         if (fd < 0) {
  79                 weston_log("opening input device '%s' failed.\n", devnode);
  80                 return 0;
  81         }
  82
  83         device = evdev_device_create(&seat->base, devnode, fd);
  84         if (device == EVDEV_UNHANDLED_DEVICE) {
  85                 close(fd);
  86                 weston_log("not using input device '%s'.\n", devnode);
  87                 return 0;
  88         } else if (device == NULL) {
  89                 close(fd);
  90                 weston_log("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                 weston_log ("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         wl_list_insert(seat->devices_list.prev, &device->link);
 117
 118         return 0;
 119 }
 120
 121 static int
 122 udev_input_add_devices(struct udev_input *input, struct udev *udev)
 123 {
 124         struct udev_enumerate *e;
 125         struct udev_list_entry *entry;
 126         struct udev_device *device;
 127         const char *path, *sysname;
 128         struct udev_seat *seat;
 129         int devices_found = 0;
 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         wl_list_for_each(seat, &input->compositor->seat_list, base.link) {
 155                 evdev_notify_keyboard_focus(&seat->base, &seat->devices_list);
 156
 157                 if (!wl_list_empty(&seat->devices_list))
 158                         devices_found = 1;
 159         }
 160
 161         if (devices_found == 0) {
 162                 weston_log(
 163                         "warning: no input devices on entering Weston. "
 164                         "Possible causes:\n"
 165                         "\t- no permissions to read /dev/input/event*\n"
 166                         "\t- seats misconfigured "
 167                         "(Weston backend option 'seat', "
 168                         "udev device property ID_SEAT)\n");
 169                 return -1;
 170         }
 171
 172         return 0;
 173 }
 174
 175 static int
 176 evdev_udev_handler(int fd, uint32_t mask, void *data)
 177 {
 178         struct udev_input *input = data;
 179         struct udev_device *udev_device;
 180         struct evdev_device *device, *next;
 181         const char *action;
 182         const char *devnode;
 183         struct udev_seat *seat;
 184
 185         udev_device = udev_monitor_receive_device(input->udev_monitor);
 186         if (!udev_device)
 187                 return 1;
 188
 189         action = udev_device_get_action(udev_device);
 190         if (!action)
 191                 goto out;
 192
 193         if (strncmp("event", udev_device_get_sysname(udev_device), 5) != 0)
 194                 goto out;
 195
 196         if (!strcmp(action, "add")) {
 197                 device_added(udev_device, input);
 198         }
 199         else if (!strcmp(action, "remove")) {
 200                 devnode = udev_device_get_devnode(udev_device);
 201                 wl_list_for_each(seat, &input->compositor->seat_list, base.link) {
 202                         wl_list_for_each_safe(device, next, &seat->devices_list, link)
 203                                 if (!strcmp(device->devnode, devnode)) {
 204                                         weston_log("input device %s, %s removed\n",
 205                                                         device->devname, device->devnode);
 206                                         evdev_device_destroy(device);
 207                                 break;
 208                         }
 209                 }
 210         }
 211
 212 out:
 213         udev_device_unref(udev_device);
 214
 215         return 0;
 216 }
 217
 218 int
 219 udev_input_enable(struct udev_input *input, struct udev *udev)
 220 {
 221         struct wl_event_loop *loop;
 222         struct weston_compositor *c = input->compositor;
 223         int fd;
 224
 225         input->udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
 226         if (!input->udev_monitor) {
 227                 weston_log("udev: failed to create the udev monitor\n");
 228                 return -1;
 229         }
 230
 231         udev_monitor_filter_add_match_subsystem_devtype(input->udev_monitor,
 232                         "input", NULL);
 233
 234         if (udev_monitor_enable_receiving(input->udev_monitor)) {
 235                 weston_log("udev: failed to bind the udev monitor\n");
 236                 udev_monitor_unref(input->udev_monitor);
 237                 return -1;
 238         }
 239
 240         loop = wl_display_get_event_loop(c->wl_display);
 241         fd = udev_monitor_get_fd(input->udev_monitor);
 242         input->udev_monitor_source =
 243                 wl_event_loop_add_fd(loop, fd, WL_EVENT_READABLE,
 244                                      evdev_udev_handler, input);
 245         if (!input->udev_monitor_source) {
 246                 udev_monitor_unref(input->udev_monitor);
 247                 return -1;
 248         }
 249
 250         if (udev_input_add_devices(input, udev) < 0)
 251                 return -1;
 252
 253         return 0;
 254 }
 255
 256 static void
 257 udev_input_remove_devices(struct udev_input *input)
 258 {
 259         struct evdev_device *device, *next;
 260         struct udev_seat *seat;
 261
 262         wl_list_for_each(seat, &input->compositor->seat_list, base.link) {
 263                 wl_list_for_each_safe(device, next, &seat->devices_list, link)
 264                         evdev_device_destroy(device);
 265
 266                 if (seat->base.keyboard)
 267                         notify_keyboard_focus_out(&seat->base);
 268         }
 269 }
 270
 271 void
 272 udev_input_disable(struct udev_input *input)
 273 {
 274         if (!input->udev_monitor)
 275                 return;
 276
 277         udev_monitor_unref(input->udev_monitor);
 278         input->udev_monitor = NULL;
 279         wl_event_source_remove(input->udev_monitor_source);
 280         input->udev_monitor_source = NULL;
 281
 282         udev_input_remove_devices(input);
 283 }
 284
 285
 286 int
 287 udev_input_init(struct udev_input *input, struct weston_compositor *c, struct udev *udev,
 288                 const char *seat_id)
 289 {
 290         memset(input, 0, sizeof *input);
 291         input->seat_id = strdup(seat_id);
 292         input->compositor = c;
 293         if (udev_input_enable(input, udev) < 0)
 294                 goto err;
 295
 296         return 0;
 297
 298  err:
 299         free(input->seat_id);
 300         return -1;
 301 }
 302
 303 void
 304 udev_input_destroy(struct udev_input *input)
 305 {
 306         struct udev_seat *seat, *next;
 307         udev_input_disable(input);
 308         wl_list_for_each_safe(seat, next, &input->compositor->seat_list, base.link)
 309                 udev_seat_destroy(seat);
 310         free(input->seat_id);
 311 }
 312
 313 static void
 314 drm_led_update(struct weston_seat *seat_base, enum weston_led leds)
 315 {
 316         struct udev_seat *seat = (struct udev_seat *) seat_base;
 317         struct evdev_device *device;
 318
 319         wl_list_for_each(device, &seat->devices_list, link)
 320                 evdev_led_update(device, leds);
 321 }
 322
 323 static struct udev_seat *
 324 udev_seat_create(struct weston_compositor *c, const char *seat_name)
 325 {
 326         struct udev_seat *seat;
 327
 328         seat = malloc(sizeof *seat);
 329
 330         if (!seat)
 331                 return NULL;
 332         memset(seat, 0, sizeof *seat);
 333         weston_seat_init(&seat->base, c, seat_name);
 334         seat->base.led_update = drm_led_update;
 335
 336         wl_list_init(&seat->devices_list);
 337         return seat;
 338 }
 339
 340 static void
 341 udev_seat_destroy(struct udev_seat *seat)
 342 {
 343         weston_seat_release(&seat->base);
 344         free(seat);
 345 }
 346
 347 struct udev_seat *
 348 udev_seat_get_named(struct weston_compositor *c, const char *seat_name)
 349 {
 350         struct udev_seat *seat;
 351
 352         wl_list_for_each(seat, &c->seat_list, base.link) {
 353                 if (strcmp(seat->base.seat_name, seat_name) == 0)
 354                         return seat;
 355         }
 356
 357         seat = udev_seat_create(c, seat_name);
 358
 359         if (!seat)
 360                 return NULL;
 361
 362         return seat;
 363 }