src/login/logind-button.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2012 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <errno.h>
  23 #include <fcntl.h>
  24 #include <string.h>
  25 #include <sys/ioctl.h>
  26 #include <unistd.h>
  27 #include <linux/input.h>
  28
  29 #include "sd-messages.h"
  30
  31 #include "alloc-util.h"
  32 #include "fd-util.h"
  33 #include "logind-button.h"
  34 #include "string-util.h"
  35 #include "util.h"
  36
  37 Button* button_new(Manager *m, const char *name) {
  38         Button *b;
  39
  40         assert(m);
  41         assert(name);
  42
  43         b = new0(Button, 1);
  44         if (!b)
  45                 return NULL;
  46
  47         b->name = strdup(name);
  48         if (!b->name) {
  49                 free(b);
  50                 return NULL;
  51         }
  52
  53         if (hashmap_put(m->buttons, b->name, b) < 0) {
  54                 free(b->name);
  55                 free(b);
  56                 return NULL;
  57         }
  58
  59         b->manager = m;
  60         b->fd = -1;
  61
  62         return b;
  63 }
  64
  65 void button_free(Button *b) {
  66         assert(b);
  67
  68         hashmap_remove(b->manager->buttons, b->name);
  69
  70         sd_event_source_unref(b->io_event_source);
  71         sd_event_source_unref(b->check_event_source);
  72
  73         if (b->fd >= 0)
  74                 /* If the device has been unplugged close() returns
  75                  * ENODEV, let's ignore this, hence we don't use
  76                  * safe_close() */
  77                 (void) close(b->fd);
  78
  79         free(b->name);
  80         free(b->seat);
  81         free(b);
  82 }
  83
  84 int button_set_seat(Button *b, const char *sn) {
  85         char *s;
  86
  87         assert(b);
  88         assert(sn);
  89
  90         s = strdup(sn);
  91         if (!s)
  92                 return -ENOMEM;
  93
  94         free(b->seat);
  95         b->seat = s;
  96
  97         return 0;
  98 }
  99
 100 static void button_lid_switch_handle_action(Manager *manager, bool is_edge) {
 101         HandleAction handle_action;
 102
 103         assert(manager);
 104
 105         /* If we are docked, handle the lid switch differently */
 106         if (manager_is_docked_or_external_displays(manager))
 107                 handle_action = manager->handle_lid_switch_docked;
 108         else
 109                 handle_action = manager->handle_lid_switch;
 110
 111         manager_handle_action(manager, INHIBIT_HANDLE_LID_SWITCH, handle_action, manager->lid_switch_ignore_inhibited, is_edge);
 112 }
 113
 114 static int button_recheck(sd_event_source *e, void *userdata) {
 115         Button *b = userdata;
 116
 117         assert(b);
 118         assert(b->lid_closed);
 119
 120         button_lid_switch_handle_action(b->manager, false);
 121         return 1;
 122 }
 123
 124 static int button_install_check_event_source(Button *b) {
 125         int r;
 126         assert(b);
 127
 128         /* Install a post handler, so that we keep rechecking as long as the lid is closed. */
 129
 130         if (b->check_event_source)
 131                 return 0;
 132
 133         r = sd_event_add_post(b->manager->event, &b->check_event_source, button_recheck, b);
 134         if (r < 0)
 135                 return r;
 136
 137         return sd_event_source_set_priority(b->check_event_source, SD_EVENT_PRIORITY_IDLE+1);
 138 }
 139
 140 static int button_dispatch(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
 141         Button *b = userdata;
 142         struct input_event ev;
 143         ssize_t l;
 144
 145         assert(s);
 146         assert(fd == b->fd);
 147         assert(b);
 148
 149         l = read(b->fd, &ev, sizeof(ev));
 150         if (l < 0)
 151                 return errno != EAGAIN ? -errno : 0;
 152         if ((size_t) l < sizeof(ev))
 153                 return -EIO;
 154
 155         if (ev.type == EV_KEY && ev.value > 0) {
 156
 157                 switch (ev.code) {
 158
 159                 case KEY_POWER:
 160                 case KEY_POWER2:
 161                         log_struct(LOG_INFO,
 162                                    LOG_MESSAGE("Power key pressed."),
 163                                    LOG_MESSAGE_ID(SD_MESSAGE_POWER_KEY),
 164                                    NULL);
 165
 166                         manager_handle_action(b->manager, INHIBIT_HANDLE_POWER_KEY, b->manager->handle_power_key, b->manager->power_key_ignore_inhibited, true);
 167                         break;
 168
 169                 /* The kernel is a bit confused here:
 170
 171                    KEY_SLEEP   = suspend-to-ram, which everybody else calls "suspend"
 172                    KEY_SUSPEND = suspend-to-disk, which everybody else calls "hibernate"
 173                 */
 174
 175                 case KEY_SLEEP:
 176                         log_struct(LOG_INFO,
 177                                    LOG_MESSAGE("Suspend key pressed."),
 178                                    LOG_MESSAGE_ID(SD_MESSAGE_SUSPEND_KEY),
 179                                    NULL);
 180
 181                         manager_handle_action(b->manager, INHIBIT_HANDLE_SUSPEND_KEY, b->manager->handle_suspend_key, b->manager->suspend_key_ignore_inhibited, true);
 182                         break;
 183
 184                 case KEY_SUSPEND:
 185                         log_struct(LOG_INFO,
 186                                    LOG_MESSAGE("Hibernate key pressed."),
 187                                    LOG_MESSAGE_ID(SD_MESSAGE_HIBERNATE_KEY),
 188                                    NULL);
 189
 190                         manager_handle_action(b->manager, INHIBIT_HANDLE_HIBERNATE_KEY, b->manager->handle_hibernate_key, b->manager->hibernate_key_ignore_inhibited, true);
 191                         break;
 192                 }
 193
 194         } else if (ev.type == EV_SW && ev.value > 0) {
 195
 196                 if (ev.code == SW_LID) {
 197                         log_struct(LOG_INFO,
 198                                    LOG_MESSAGE("Lid closed."),
 199                                    LOG_MESSAGE_ID(SD_MESSAGE_LID_CLOSED),
 200                                    NULL);
 201
 202                         b->lid_closed = true;
 203                         button_lid_switch_handle_action(b->manager, true);
 204                         button_install_check_event_source(b);
 205
 206                 } else if (ev.code == SW_DOCK) {
 207                         log_struct(LOG_INFO,
 208                                    LOG_MESSAGE("System docked."),
 209                                    LOG_MESSAGE_ID(SD_MESSAGE_SYSTEM_DOCKED),
 210                                    NULL);
 211
 212                         b->docked = true;
 213                 }
 214
 215         } else if (ev.type == EV_SW && ev.value == 0) {
 216
 217                 if (ev.code == SW_LID) {
 218                         log_struct(LOG_INFO,
 219                                    LOG_MESSAGE("Lid opened."),
 220                                    LOG_MESSAGE_ID(SD_MESSAGE_LID_OPENED),
 221                                    NULL);
 222
 223                         b->lid_closed = false;
 224                         b->check_event_source = sd_event_source_unref(b->check_event_source);
 225
 226                 } else if (ev.code == SW_DOCK) {
 227                         log_struct(LOG_INFO,
 228                                    LOG_MESSAGE("System undocked."),
 229                                    LOG_MESSAGE_ID(SD_MESSAGE_SYSTEM_UNDOCKED),
 230                                    NULL);
 231
 232                         b->docked = false;
 233                 }
 234         }
 235
 236         return 0;
 237 }
 238
 239 int button_open(Button *b) {
 240         char *p, name[256];
 241         int r;
 242
 243         assert(b);
 244
 245         b->fd = safe_close(b->fd);
 246
 247         p = strjoina("/dev/input/", b->name);
 248
 249         b->fd = open(p, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK);
 250         if (b->fd < 0)
 251                 return log_warning_errno(errno, "Failed to open %s: %m", b->name);
 252
 253         if (ioctl(b->fd, EVIOCGNAME(sizeof(name)), name) < 0) {
 254                 r = log_error_errno(errno, "Failed to get input name: %m");
 255                 goto fail;
 256         }
 257
 258         r = sd_event_add_io(b->manager->event, &b->io_event_source, b->fd, EPOLLIN, button_dispatch, b);
 259         if (r < 0) {
 260                 log_error_errno(r, "Failed to add button event: %m");
 261                 goto fail;
 262         }
 263
 264         log_info("Watching system buttons on /dev/input/%s (%s)", b->name, name);
 265
 266         return 0;
 267
 268 fail:
 269         b->fd = safe_close(b->fd);
 270         return r;
 271 }
 272
 273 int button_check_switches(Button *b) {
 274         uint8_t switches[SW_MAX/8+1] = {};
 275         assert(b);
 276
 277         if (b->fd < 0)
 278                 return -EINVAL;
 279
 280         if (ioctl(b->fd, EVIOCGSW(sizeof(switches)), switches) < 0)
 281                 return -errno;
 282
 283         b->lid_closed = (switches[SW_LID/8] >> (SW_LID % 8)) & 1;
 284         b->docked = (switches[SW_DOCK/8] >> (SW_DOCK % 8)) & 1;
 285
 286         if (b->lid_closed)
 287                 button_install_check_event_source(b);
 288
 289         return 0;
 290 }