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 <stdlib.h>
  24 #include <string.h>
  25 #include <unistd.h>
  26 #include <fcntl.h>
  27
  28 #include "compositor.h"
  29 #include "launcher-util.h"
  30 #include "evdev.h"
  31 #include "udev-seat.h"
  32
  33 static const char default_seat[] = "seat0";
  34
  35 static int
  36 device_added(struct udev_device *udev_device, struct udev_seat *master)
  37 {
  38         struct weston_compositor *c;
  39         struct evdev_device *device;
  40         const char *devnode;
  41         const char *device_seat;
  42         const char *calibration_values;
  43         int fd;
  44
  45         device_seat = udev_device_get_property_value(udev_device, "ID_SEAT");
  46         if (!device_seat)
  47                 device_seat = default_seat;
  48
  49         if (strcmp(device_seat, master->seat_id))
  50                 return 0;
  51
  52         c = master->base.compositor;
  53         devnode = udev_device_get_devnode(udev_device);
  54
  55         /* Use non-blocking mode so that we can loop on read on
  56          * evdev_device_data() until all events on the fd are
  57          * read.  mtdev_get() also expects this. */
  58         fd = weston_launcher_open(c, devnode, O_RDWR | O_NONBLOCK);
  59         if (fd < 0) {
  60                 weston_log("opening input device '%s' failed.\n", devnode);
  61                 return -1;
  62         }
  63
  64         device = evdev_device_create(&master->base, devnode, fd);
  65         if (device == EVDEV_UNHANDLED_DEVICE) {
  66                 close(fd);
  67                 weston_log("not using input device '%s'.\n", devnode);
  68                 return 0;
  69         } else if (device == NULL) {
  70                 close(fd);
  71                 weston_log("failed to create input device '%s'.\n", devnode);
  72                 return -1;
  73         }
  74
  75         calibration_values =
  76                 udev_device_get_property_value(udev_device,
  77                                                "WL_CALIBRATION");
  78
  79         if (calibration_values && sscanf(calibration_values,
  80                                          "%f %f %f %f %f %f",
  81                                          &device->abs.calibration[0],
  82                                          &device->abs.calibration[1],
  83                                          &device->abs.calibration[2],
  84                                          &device->abs.calibration[3],
  85                                          &device->abs.calibration[4],
  86                                          &device->abs.calibration[5]) == 6) {
  87                 device->abs.apply_calibration = 1;
  88                 weston_log ("Applying calibration: %f %f %f %f %f %f\n",
  89                             device->abs.calibration[0],
  90                             device->abs.calibration[1],
  91                             device->abs.calibration[2],
  92                             device->abs.calibration[3],
  93                             device->abs.calibration[4],
  94                             device->abs.calibration[5]);
  95         }
  96
  97         wl_list_insert(master->devices_list.prev, &device->link);
  98
  99         return 0;
 100 }
 101
 102 static int
 103 udev_seat_add_devices(struct udev_seat *seat, struct udev *udev)
 104 {
 105         struct udev_enumerate *e;
 106         struct udev_list_entry *entry;
 107         struct udev_device *device;
 108         const char *path, *sysname;
 109
 110         e = udev_enumerate_new(udev);
 111         udev_enumerate_add_match_subsystem(e, "input");
 112         udev_enumerate_scan_devices(e);
 113         udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(e)) {
 114                 path = udev_list_entry_get_name(entry);
 115                 device = udev_device_new_from_syspath(udev, path);
 116
 117                 sysname = udev_device_get_sysname(device);
 118                 if (strncmp("event", sysname, 5) != 0) {
 119                         udev_device_unref(device);
 120                         continue;
 121                 }
 122
 123                 if (device_added(device, seat) < 0) {
 124                         udev_device_unref(device);
 125                         udev_enumerate_unref(e);
 126                         return -1;
 127                 }
 128
 129                 udev_device_unref(device);
 130         }
 131         udev_enumerate_unref(e);
 132
 133         evdev_notify_keyboard_focus(&seat->base, &seat->devices_list);
 134
 135         if (wl_list_empty(&seat->devices_list)) {
 136                 weston_log(
 137                         "warning: no input devices on entering Weston. "
 138                         "Possible causes:\n"
 139                         "\t- no permissions to read /dev/input/event*\n"
 140                         "\t- seats misconfigured "
 141                         "(Weston backend option 'seat', "
 142                         "udev device property ID_SEAT)\n");
 143         }
 144
 145         return 0;
 146 }
 147
 148 static int
 149 evdev_udev_handler(int fd, uint32_t mask, void *data)
 150 {
 151         struct udev_seat *seat = data;
 152         struct udev_device *udev_device;
 153         struct evdev_device *device, *next;
 154         const char *action;
 155         const char *devnode;
 156
 157         udev_device = udev_monitor_receive_device(seat->udev_monitor);
 158         if (!udev_device)
 159                 return 1;
 160
 161         action = udev_device_get_action(udev_device);
 162         if (!action)
 163                 goto out;
 164
 165         if (strncmp("event", udev_device_get_sysname(udev_device), 5) != 0)
 166                 goto out;
 167
 168         if (!strcmp(action, "add")) {
 169                 device_added(udev_device, seat);
 170         }
 171         else if (!strcmp(action, "remove")) {
 172                 devnode = udev_device_get_devnode(udev_device);
 173                 wl_list_for_each_safe(device, next, &seat->devices_list, link)
 174                         if (!strcmp(device->devnode, devnode)) {
 175                                 weston_log("input device %s, %s removed\n",
 176                                            device->devname, device->devnode);
 177                                 evdev_device_destroy(device);
 178                                 break;
 179                         }
 180         }
 181
 182 out:
 183         udev_device_unref(udev_device);
 184
 185         return 0;
 186 }
 187
 188 int
 189 udev_seat_enable(struct udev_seat *seat, struct udev *udev)
 190 {
 191         struct wl_event_loop *loop;
 192         struct weston_compositor *c = seat->base.compositor;
 193         int fd;
 194
 195         seat->udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
 196         if (!seat->udev_monitor) {
 197                 weston_log("udev: failed to create the udev monitor\n");
 198                 return -1;
 199         }
 200
 201         udev_monitor_filter_add_match_subsystem_devtype(seat->udev_monitor,
 202                         "input", NULL);
 203
 204         if (udev_monitor_enable_receiving(seat->udev_monitor)) {
 205                 weston_log("udev: failed to bind the udev monitor\n");
 206                 udev_monitor_unref(seat->udev_monitor);
 207                 return -1;
 208         }
 209
 210         loop = wl_display_get_event_loop(c->wl_display);
 211         fd = udev_monitor_get_fd(seat->udev_monitor);
 212         seat->udev_monitor_source =
 213                 wl_event_loop_add_fd(loop, fd, WL_EVENT_READABLE,
 214                                      evdev_udev_handler, seat);
 215         if (!seat->udev_monitor_source) {
 216                 udev_monitor_unref(seat->udev_monitor);
 217                 return -1;
 218         }
 219
 220         if (udev_seat_add_devices(seat, udev) < 0)
 221                 return -1;
 222
 223         return 0;
 224 }
 225
 226 static void
 227 udev_seat_remove_devices(struct udev_seat *seat)
 228 {
 229         struct evdev_device *device, *next;
 230
 231         wl_list_for_each_safe(device, next, &seat->devices_list, link)
 232                 evdev_device_destroy(device);
 233
 234         if (seat->base.seat.keyboard)
 235                 notify_keyboard_focus_out(&seat->base);
 236 }
 237
 238 void
 239 udev_seat_disable(struct udev_seat *seat)
 240 {
 241         if (!seat->udev_monitor)
 242                 return;
 243
 244         udev_monitor_unref(seat->udev_monitor);
 245         seat->udev_monitor = NULL;
 246         wl_event_source_remove(seat->udev_monitor_source);
 247         seat->udev_monitor_source = NULL;
 248
 249         udev_seat_remove_devices(seat);
 250 }
 251
 252 static void
 253 drm_led_update(struct weston_seat *seat_base, enum weston_led leds)
 254 {
 255         struct udev_seat *seat = (struct udev_seat *) seat_base;
 256         struct evdev_device *device;
 257
 258         wl_list_for_each(device, &seat->devices_list, link)
 259                 evdev_led_update(device, leds);
 260 }
 261
 262 struct udev_seat *
 263 udev_seat_create(struct weston_compositor *c, struct udev *udev,
 264                 const char *seat_id)
 265 {
 266         struct udev_seat *seat;
 267
 268         seat = malloc(sizeof *seat);
 269         if (seat == NULL)
 270                 return NULL;
 271
 272         memset(seat, 0, sizeof *seat);
 273         weston_seat_init(&seat->base, c);
 274         seat->base.led_update = drm_led_update;
 275
 276         wl_list_init(&seat->devices_list);
 277         seat->seat_id = strdup(seat_id);
 278         if (udev_seat_enable(seat, udev) < 0)
 279                 goto err;
 280
 281         return seat;
 282
 283  err:
 284         free(seat->seat_id);
 285         free(seat);
 286         return NULL;
 287 }
 288
 289 void
 290 udev_seat_destroy(struct udev_seat *seat)
 291 {
 292         udev_seat_disable(seat);
 293
 294         weston_seat_release(&seat->base);
 295         free(seat->seat_id);
 296         free(seat);
 297 }