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 0;
  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 0;
  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                 return -1;
 144         }
 145
 146         return 0;
 147 }
 148
 149 static int
 150 evdev_udev_handler(int fd, uint32_t mask, void *data)
 151 {
 152         struct udev_seat *seat = data;
 153         struct udev_device *udev_device;
 154         struct evdev_device *device, *next;
 155         const char *action;
 156         const char *devnode;
 157
 158         udev_device = udev_monitor_receive_device(seat->udev_monitor);
 159         if (!udev_device)
 160                 return 1;
 161
 162         action = udev_device_get_action(udev_device);
 163         if (!action)
 164                 goto out;
 165
 166         if (strncmp("event", udev_device_get_sysname(udev_device), 5) != 0)
 167                 goto out;
 168
 169         if (!strcmp(action, "add")) {
 170                 device_added(udev_device, seat);
 171         }
 172         else if (!strcmp(action, "remove")) {
 173                 devnode = udev_device_get_devnode(udev_device);
 174                 wl_list_for_each_safe(device, next, &seat->devices_list, link)
 175                         if (!strcmp(device->devnode, devnode)) {
 176                                 weston_log("input device %s, %s removed\n",
 177                                            device->devname, device->devnode);
 178                                 evdev_device_destroy(device);
 179                                 break;
 180                         }
 181         }
 182
 183 out:
 184         udev_device_unref(udev_device);
 185
 186         return 0;
 187 }
 188
 189 int
 190 udev_seat_enable(struct udev_seat *seat, struct udev *udev)
 191 {
 192         struct wl_event_loop *loop;
 193         struct weston_compositor *c = seat->base.compositor;
 194         int fd;
 195
 196         seat->udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
 197         if (!seat->udev_monitor) {
 198                 weston_log("udev: failed to create the udev monitor\n");
 199                 return -1;
 200         }
 201
 202         udev_monitor_filter_add_match_subsystem_devtype(seat->udev_monitor,
 203                         "input", NULL);
 204
 205         if (udev_monitor_enable_receiving(seat->udev_monitor)) {
 206                 weston_log("udev: failed to bind the udev monitor\n");
 207                 udev_monitor_unref(seat->udev_monitor);
 208                 return -1;
 209         }
 210
 211         loop = wl_display_get_event_loop(c->wl_display);
 212         fd = udev_monitor_get_fd(seat->udev_monitor);
 213         seat->udev_monitor_source =
 214                 wl_event_loop_add_fd(loop, fd, WL_EVENT_READABLE,
 215                                      evdev_udev_handler, seat);
 216         if (!seat->udev_monitor_source) {
 217                 udev_monitor_unref(seat->udev_monitor);
 218                 return -1;
 219         }
 220
 221         if (udev_seat_add_devices(seat, udev) < 0)
 222                 return -1;
 223
 224         return 0;
 225 }
 226
 227 static void
 228 udev_seat_remove_devices(struct udev_seat *seat)
 229 {
 230         struct evdev_device *device, *next;
 231
 232         wl_list_for_each_safe(device, next, &seat->devices_list, link)
 233                 evdev_device_destroy(device);
 234
 235         if (seat->base.keyboard)
 236                 notify_keyboard_focus_out(&seat->base);
 237 }
 238
 239 void
 240 udev_seat_disable(struct udev_seat *seat)
 241 {
 242         if (!seat->udev_monitor)
 243                 return;
 244
 245         udev_monitor_unref(seat->udev_monitor);
 246         seat->udev_monitor = NULL;
 247         wl_event_source_remove(seat->udev_monitor_source);
 248         seat->udev_monitor_source = NULL;
 249
 250         udev_seat_remove_devices(seat);
 251 }
 252
 253 static void
 254 drm_led_update(struct weston_seat *seat_base, enum weston_led leds)
 255 {
 256         struct udev_seat *seat = (struct udev_seat *) seat_base;
 257         struct evdev_device *device;
 258
 259         wl_list_for_each(device, &seat->devices_list, link)
 260                 evdev_led_update(device, leds);
 261 }
 262
 263 struct udev_seat *
 264 udev_seat_create(struct weston_compositor *c, struct udev *udev,
 265                 const char *seat_id)
 266 {
 267         struct udev_seat *seat;
 268
 269         seat = malloc(sizeof *seat);
 270         if (seat == NULL)
 271                 return NULL;
 272
 273         memset(seat, 0, sizeof *seat);
 274         weston_seat_init(&seat->base, c);
 275         seat->base.led_update = drm_led_update;
 276
 277         wl_list_init(&seat->devices_list);
 278         seat->seat_id = strdup(seat_id);
 279         if (udev_seat_enable(seat, udev) < 0)
 280                 goto err;
 281
 282         return seat;
 283
 284  err:
 285         free(seat->seat_id);
 286         free(seat);
 287         return NULL;
 288 }
 289
 290 void
 291 udev_seat_destroy(struct udev_seat *seat)
 292 {
 293         udev_seat_disable(seat);
 294
 295         weston_seat_release(&seat->base);
 296         free(seat->seat_id);
 297         free(seat);
 298 }