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                 return mfree(b);
  48
  49         if (hashmap_put(m->buttons, b->name, b) < 0) {
  50                 free(b->name);
  51                 return mfree(b);
  52         }
  53
  54         b->manager = m;
  55         b->fd = -1;
  56
  57         return b;
  58 }
  59
  60 void button_free(Button *b) {
  61         assert(b);
  62
  63         hashmap_remove(b->manager->buttons, b->name);
  64
  65         sd_event_source_unref(b->io_event_source);
  66         sd_event_source_unref(b->check_event_source);
  67
  68         if (b->fd >= 0)
  69                 /* If the device has been unplugged close() returns
  70                  * ENODEV, let's ignore this, hence we don't use
  71                  * safe_close() */
  72                 (void) close(b->fd);
  73
  74         free(b->name);
  75         free(b->seat);
  76         free(b);
  77 }
  78
  79 int button_set_seat(Button *b, const char *sn) {
  80         char *s;
  81
  82         assert(b);
  83         assert(sn);
  84
  85         s = strdup(sn);
  86         if (!s)
  87                 return -ENOMEM;
  88
  89         free(b->seat);
  90         b->seat = s;
  91
  92         return 0;
  93 }
  94
  95 static void button_lid_switch_handle_action(Manager *manager, bool is_edge) {
  96         HandleAction handle_action;
  97
  98         assert(manager);
  99
 100         /* If we are docked, handle the lid switch differently */
 101         if (manager_is_docked_or_external_displays(manager))
 102                 handle_action = manager->handle_lid_switch_docked;
 103         else
 104                 handle_action = manager->handle_lid_switch;
 105
 106         manager_handle_action(manager, INHIBIT_HANDLE_LID_SWITCH, handle_action, manager->lid_switch_ignore_inhibited, is_edge);
 107 }
 108
 109 static int button_recheck(sd_event_source *e, void *userdata) {
 110         Button *b = userdata;
 111
 112         assert(b);
 113         assert(b->lid_closed);
 114
 115         button_lid_switch_handle_action(b->manager, false);
 116         return 1;
 117 }
 118
 119 static int button_install_check_event_source(Button *b) {
 120         int r;
 121         assert(b);
 122
 123         /* Install a post handler, so that we keep rechecking as long as the lid is closed. */
 124
 125         if (b->check_event_source)
 126                 return 0;
 127
 128         r = sd_event_add_post(b->manager->event, &b->check_event_source, button_recheck, b);
 129         if (r < 0)
 130                 return r;
 131
 132         return sd_event_source_set_priority(b->check_event_source, SD_EVENT_PRIORITY_IDLE+1);
 133 }
 134
 135 static int button_dispatch(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
 136         Button *b = userdata;
 137         struct input_event ev;
 138         ssize_t l;
 139
 140         assert(s);
 141         assert(fd == b->fd);
 142         assert(b);
 143
 144         l = read(b->fd, &ev, sizeof(ev));
 145         if (l < 0)
 146                 return errno != EAGAIN ? -errno : 0;
 147         if ((size_t) l < sizeof(ev))
 148                 return -EIO;
 149
 150         if (ev.type == EV_KEY && ev.value > 0) {
 151
 152                 switch (ev.code) {
 153
 154                 case KEY_POWER:
 155                 case KEY_POWER2:
 156                         log_struct(LOG_INFO,
 157                                    LOG_MESSAGE("Power key pressed."),
 158                                    LOG_MESSAGE_ID(SD_MESSAGE_POWER_KEY),
 159                                    NULL);
 160
 161                         manager_handle_action(b->manager, INHIBIT_HANDLE_POWER_KEY, b->manager->handle_power_key, b->manager->power_key_ignore_inhibited, true);
 162                         break;
 163
 164                 /* The kernel is a bit confused here:
 165
 166                    KEY_SLEEP   = suspend-to-ram, which everybody else calls "suspend"
 167                    KEY_SUSPEND = suspend-to-disk, which everybody else calls "hibernate"
 168                 */
 169
 170                 case KEY_SLEEP:
 171                         log_struct(LOG_INFO,
 172                                    LOG_MESSAGE("Suspend key pressed."),
 173                                    LOG_MESSAGE_ID(SD_MESSAGE_SUSPEND_KEY),
 174                                    NULL);
 175
 176                         manager_handle_action(b->manager, INHIBIT_HANDLE_SUSPEND_KEY, b->manager->handle_suspend_key, b->manager->suspend_key_ignore_inhibited, true);
 177                         break;
 178
 179                 case KEY_SUSPEND:
 180                         log_struct(LOG_INFO,
 181                                    LOG_MESSAGE("Hibernate key pressed."),
 182                                    LOG_MESSAGE_ID(SD_MESSAGE_HIBERNATE_KEY),
 183                                    NULL);
 184
 185                         manager_handle_action(b->manager, INHIBIT_HANDLE_HIBERNATE_KEY, b->manager->handle_hibernate_key, b->manager->hibernate_key_ignore_inhibited, true);
 186                         break;
 187                 }
 188
 189         } else if (ev.type == EV_SW && ev.value > 0) {
 190
 191                 if (ev.code == SW_LID) {
 192                         log_struct(LOG_INFO,
 193                                    LOG_MESSAGE("Lid closed."),
 194                                    LOG_MESSAGE_ID(SD_MESSAGE_LID_CLOSED),
 195                                    NULL);
 196
 197                         b->lid_closed = true;
 198                         button_lid_switch_handle_action(b->manager, true);
 199                         button_install_check_event_source(b);
 200
 201                 } else if (ev.code == SW_DOCK) {
 202                         log_struct(LOG_INFO,
 203                                    LOG_MESSAGE("System docked."),
 204                                    LOG_MESSAGE_ID(SD_MESSAGE_SYSTEM_DOCKED),
 205                                    NULL);
 206
 207                         b->docked = true;
 208                 }
 209
 210         } else if (ev.type == EV_SW && ev.value == 0) {
 211
 212                 if (ev.code == SW_LID) {
 213                         log_struct(LOG_INFO,
 214                                    LOG_MESSAGE("Lid opened."),
 215                                    LOG_MESSAGE_ID(SD_MESSAGE_LID_OPENED),
 216                                    NULL);
 217
 218                         b->lid_closed = false;
 219                         b->check_event_source = sd_event_source_unref(b->check_event_source);
 220
 221                 } else if (ev.code == SW_DOCK) {
 222                         log_struct(LOG_INFO,
 223                                    LOG_MESSAGE("System undocked."),
 224                                    LOG_MESSAGE_ID(SD_MESSAGE_SYSTEM_UNDOCKED),
 225                                    NULL);
 226
 227                         b->docked = false;
 228                 }
 229         }
 230
 231         return 0;
 232 }
 233
 234 int button_open(Button *b) {
 235         char *p, name[256];
 236         int r;
 237
 238         assert(b);
 239
 240         b->fd = safe_close(b->fd);
 241
 242         p = strjoina("/dev/input/", b->name);
 243
 244         b->fd = open(p, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK);
 245         if (b->fd < 0)
 246                 return log_warning_errno(errno, "Failed to open %s: %m", b->name);
 247
 248         if (ioctl(b->fd, EVIOCGNAME(sizeof(name)), name) < 0) {
 249                 r = log_error_errno(errno, "Failed to get input name: %m");
 250                 goto fail;
 251         }
 252
 253         r = sd_event_add_io(b->manager->event, &b->io_event_source, b->fd, EPOLLIN, button_dispatch, b);
 254         if (r < 0) {
 255                 log_error_errno(r, "Failed to add button event: %m");
 256                 goto fail;
 257         }
 258
 259         log_info("Watching system buttons on /dev/input/%s (%s)", b->name, name);
 260
 261         return 0;
 262
 263 fail:
 264         b->fd = safe_close(b->fd);
 265         return r;
 266 }
 267
 268 int button_check_switches(Button *b) {
 269         uint8_t switches[SW_MAX/8+1] = {};
 270         assert(b);
 271
 272         if (b->fd < 0)
 273                 return -EINVAL;
 274
 275         if (ioctl(b->fd, EVIOCGSW(sizeof(switches)), switches) < 0)
 276                 return -errno;
 277
 278         b->lid_closed = (switches[SW_LID/8] >> (SW_LID % 8)) & 1;
 279         b->docked = (switches[SW_DOCK/8] >> (SW_DOCK % 8)) & 1;
 280
 281         if (b->lid_closed)
 282                 button_install_check_event_source(b);
 283
 284         return 0;
 285 }