src/login/logind-button.c

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