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 struct udev_seat *
  36 udev_seat_create(struct weston_compositor *c);
  37 static void
  38 udev_seat_destroy(struct udev_seat *seat);
  39
  40 static int
  41 device_added(struct udev_device *udev_device, struct udev_input *input)
  42 {
  43         struct weston_compositor *c;
  44         struct evdev_device *device;
  45         const char *devnode;
  46         const char *device_seat;
  47         const char *calibration_values;
  48         int fd;
  49         struct udev_seat *seat;
  50
  51         device_seat = udev_device_get_property_value(udev_device, "ID_SEAT");
  52         if (!device_seat)
  53                 device_seat = default_seat;
  54
  55         if (strcmp(device_seat, input->seat_id))
  56                 return 0;
  57
  58         c = input->compositor;
  59         devnode = udev_device_get_devnode(udev_device);
  60
  61         /* Single default seat for now */
  62         if (!input->seat)
  63                 input->seat = udev_seat_create(c);
  64
  65         if (!input->seat)
  66                 return -1;
  67
  68         seat = input->seat;
  69
  70         /* Use non-blocking mode so that we can loop on read on
  71          * evdev_device_data() until all events on the fd are
  72          * read.  mtdev_get() also expects this. */
  73         fd = weston_launcher_open(c, devnode, O_RDWR | O_NONBLOCK);
  74         if (fd < 0) {
  75                 weston_log("opening input device '%s' failed.\n", devnode);
  76                 return 0;
  77         }
  78
  79         device = evdev_device_create(&seat->base, devnode, fd);
  80         if (device == EVDEV_UNHANDLED_DEVICE) {
  81                 close(fd);
  82                 weston_log("not using input device '%s'.\n", devnode);
  83                 return 0;
  84         } else if (device == NULL) {
  85                 close(fd);
  86                 weston_log("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                 weston_log ("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         wl_list_insert(seat->devices_list.prev, &device->link);
 113
 114         return 0;
 115 }
 116
 117 static int
 118 udev_input_add_devices(struct udev_input *input, struct udev *udev)
 119 {
 120         struct udev_enumerate *e;
 121         struct udev_list_entry *entry;
 122         struct udev_device *device;
 123         const char *path, *sysname;
 124
 125         e = udev_enumerate_new(udev);
 126         udev_enumerate_add_match_subsystem(e, "input");
 127         udev_enumerate_scan_devices(e);
 128         udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(e)) {
 129                 path = udev_list_entry_get_name(entry);
 130                 device = udev_device_new_from_syspath(udev, path);
 131
 132                 sysname = udev_device_get_sysname(device);
 133                 if (strncmp("event", sysname, 5) != 0) {
 134                         udev_device_unref(device);
 135                         continue;
 136                 }
 137
 138                 if (device_added(device, input) < 0) {
 139                         udev_device_unref(device);
 140                         udev_enumerate_unref(e);
 141                         return -1;
 142                 }
 143
 144                 udev_device_unref(device);
 145         }
 146         udev_enumerate_unref(e);
 147
 148         evdev_notify_keyboard_focus(&input->seat->base, &input->seat->devices_list);
 149
 150         if (wl_list_empty(&input->seat->devices_list)) {
 151                 weston_log(
 152                         "warning: no input devices on entering Weston. "
 153                         "Possible causes:\n"
 154                         "\t- no permissions to read /dev/input/event*\n"
 155                         "\t- seats misconfigured "
 156                         "(Weston backend option 'seat', "
 157                         "udev device property ID_SEAT)\n");
 158                 return -1;
 159         }
 160
 161         return 0;
 162 }
 163
 164 static int
 165 evdev_udev_handler(int fd, uint32_t mask, void *data)
 166 {
 167         struct udev_input *input = data;
 168         struct udev_device *udev_device;
 169         struct evdev_device *device, *next;
 170         const char *action;
 171         const char *devnode;
 172
 173         udev_device = udev_monitor_receive_device(input->udev_monitor);
 174         if (!udev_device)
 175                 return 1;
 176
 177         action = udev_device_get_action(udev_device);
 178         if (!action)
 179                 goto out;
 180
 181         if (strncmp("event", udev_device_get_sysname(udev_device), 5) != 0)
 182                 goto out;
 183
 184         if (!strcmp(action, "add")) {
 185                 device_added(udev_device, input);
 186         }
 187         else if (!strcmp(action, "remove")) {
 188                 devnode = udev_device_get_devnode(udev_device);
 189                 wl_list_for_each_safe(device, next, &input->seat->devices_list, link)
 190                         if (!strcmp(device->devnode, devnode)) {
 191                                 weston_log("input device %s, %s removed\n",
 192                                            device->devname, device->devnode);
 193                                 evdev_device_destroy(device);
 194                                 break;
 195                         }
 196         }
 197
 198 out:
 199         udev_device_unref(udev_device);
 200
 201         return 0;
 202 }
 203
 204 int
 205 udev_input_enable(struct udev_input *input, struct udev *udev)
 206 {
 207         struct wl_event_loop *loop;
 208         struct weston_compositor *c = input->compositor;
 209         int fd;
 210
 211         input->udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
 212         if (!input->udev_monitor) {
 213                 weston_log("udev: failed to create the udev monitor\n");
 214                 return -1;
 215         }
 216
 217         udev_monitor_filter_add_match_subsystem_devtype(input->udev_monitor,
 218                         "input", NULL);
 219
 220         if (udev_monitor_enable_receiving(input->udev_monitor)) {
 221                 weston_log("udev: failed to bind the udev monitor\n");
 222                 udev_monitor_unref(input->udev_monitor);
 223                 return -1;
 224         }
 225
 226         loop = wl_display_get_event_loop(c->wl_display);
 227         fd = udev_monitor_get_fd(input->udev_monitor);
 228         input->udev_monitor_source =
 229                 wl_event_loop_add_fd(loop, fd, WL_EVENT_READABLE,
 230                                      evdev_udev_handler, input);
 231         if (!input->udev_monitor_source) {
 232                 udev_monitor_unref(input->udev_monitor);
 233                 return -1;
 234         }
 235
 236         if (udev_input_add_devices(input, udev) < 0)
 237                 return -1;
 238
 239         return 0;
 240 }
 241
 242 static void
 243 udev_input_remove_devices(struct udev_input *input)
 244 {
 245         struct evdev_device *device, *next;
 246
 247         wl_list_for_each_safe(device, next, &input->seat->devices_list, link)
 248                 evdev_device_destroy(device);
 249
 250         if (input->seat->base.keyboard)
 251                 notify_keyboard_focus_out(&input->seat->base);
 252 }
 253
 254 void
 255 udev_input_disable(struct udev_input *input)
 256 {
 257         if (!input->udev_monitor)
 258                 return;
 259
 260         udev_monitor_unref(input->udev_monitor);
 261         input->udev_monitor = NULL;
 262         wl_event_source_remove(input->udev_monitor_source);
 263         input->udev_monitor_source = NULL;
 264
 265         udev_input_remove_devices(input);
 266 }
 267
 268
 269 int
 270 udev_input_init(struct udev_input *input, struct weston_compositor *c, struct udev *udev,
 271                 const char *seat_id)
 272 {
 273         memset(input, 0, sizeof *input);
 274         input->seat_id = strdup(seat_id);
 275         input->compositor = c;
 276         if (udev_input_enable(input, udev) < 0)
 277                 goto err;
 278
 279         return 0;
 280
 281  err:
 282         free(input->seat_id);
 283         return -1;
 284 }
 285
 286 void
 287 udev_input_destroy(struct udev_input *input)
 288 {
 289         udev_input_disable(input);
 290         udev_seat_destroy(input->seat);
 291         free(input->seat_id);
 292 }
 293
 294 static void
 295 drm_led_update(struct weston_seat *seat_base, enum weston_led leds)
 296 {
 297         struct udev_seat *seat = (struct udev_seat *) seat_base;
 298         struct evdev_device *device;
 299
 300         wl_list_for_each(device, &seat->devices_list, link)
 301                 evdev_led_update(device, leds);
 302 }
 303
 304 static struct udev_seat *
 305 udev_seat_create(struct weston_compositor *c)
 306 {
 307         struct udev_seat *seat;
 308
 309         seat = malloc(sizeof *seat);
 310
 311         if (!seat)
 312                 return NULL;
 313         memset(seat, 0, sizeof *seat);
 314         weston_seat_init(&seat->base, c, "default");
 315         seat->base.led_update = drm_led_update;
 316
 317         wl_list_init(&seat->devices_list);
 318         return seat;
 319 }
 320
 321 static void
 322 udev_seat_destroy(struct udev_seat *seat)
 323 {
 324         weston_seat_release(&seat->base);
 325         free(seat);
 326 }