logind-button.c revision 7f6e12b03300ba3e473ce6b85d823fc0375b335e
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2012 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <linux/input.h>
#include "sd-messages.h"
#include "util.h"
#include "logind-button.h"
Button* button_new(Manager *m, const char *name) {
Button *b;
assert(m);
assert(name);
b = new0(Button, 1);
if (!b)
return NULL;
b->name = strdup(name);
if (!b->name) {
free(b);
return NULL;
}
if (hashmap_put(m->buttons, b->name, b) < 0) {
free(b->name);
free(b);
return NULL;
}
b->manager = m;
b->fd = -1;
return b;
}
void button_free(Button *b) {
assert(b);
hashmap_remove(b->manager->buttons, b->name);
sd_event_source_unref(b->io_event_source);
sd_event_source_unref(b->check_event_source);
if (b->fd >= 0) {
/* If the device has been unplugged close() returns
* ENODEV, let's ignore this, hence we don't use
* safe_close() */
(void) close(b->fd);
}
free(b->name);
free(b->seat);
free(b);
}
int button_set_seat(Button *b, const char *sn) {
char *s;
assert(b);
assert(sn);
s = strdup(sn);
if (!s)
return -ENOMEM;
free(b->seat);
b->seat = s;
return 0;
}
static void button_lid_switch_handle_action(Manager *manager, bool is_edge) {
HandleAction handle_action;
assert(manager);
/* If we are docked, handle the lid switch differently */
if (manager_is_docked_or_external_displays(manager))
handle_action = manager->handle_lid_switch_docked;
else
handle_action = manager->handle_lid_switch;
manager_handle_action(manager, INHIBIT_HANDLE_LID_SWITCH, handle_action, manager->lid_switch_ignore_inhibited, is_edge);
}
static int button_recheck(sd_event_source *e, void *userdata) {
Button *b = userdata;
assert(b);
assert(b->lid_closed);
button_lid_switch_handle_action(b->manager, false);
return 1;
}
static int button_install_check_event_source(Button *b) {
int r;
assert(b);
/* Install a post handler, so that we keep rechecking as long as the lid is closed. */
if (b->check_event_source)
return 0;
r = sd_event_add_post(b->manager->event, &b->check_event_source, button_recheck, b);
if (r < 0)
return r;
return sd_event_source_set_priority(b->check_event_source, SD_EVENT_PRIORITY_IDLE+1);
}
static int button_dispatch(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
Button *b = userdata;
struct input_event ev;
ssize_t l;
assert(s);
assert(fd == b->fd);
assert(b);
l = read(b->fd, &ev, sizeof(ev));
if (l < 0)
return errno != EAGAIN ? -errno : 0;
if ((size_t) l < sizeof(ev))
return -EIO;
if (ev.type == EV_KEY && ev.value > 0) {
switch (ev.code) {
case KEY_POWER:
case KEY_POWER2:
log_struct(LOG_INFO,
LOG_MESSAGE("Power key pressed."),
LOG_MESSAGE_ID(SD_MESSAGE_POWER_KEY),
NULL);
manager_handle_action(b->manager, INHIBIT_HANDLE_POWER_KEY, b->manager->handle_power_key, b->manager->power_key_ignore_inhibited, true);
break;
/* The kernel is a bit confused here:
KEY_SLEEP = suspend-to-ram, which everybody else calls "suspend"
KEY_SUSPEND = suspend-to-disk, which everybody else calls "hibernate"
*/
case KEY_SLEEP:
log_struct(LOG_INFO,
LOG_MESSAGE("Suspend key pressed."),
LOG_MESSAGE_ID(SD_MESSAGE_SUSPEND_KEY),
NULL);
manager_handle_action(b->manager, INHIBIT_HANDLE_SUSPEND_KEY, b->manager->handle_suspend_key, b->manager->suspend_key_ignore_inhibited, true);
break;
case KEY_SUSPEND:
log_struct(LOG_INFO,
LOG_MESSAGE("Hibernate key pressed."),
LOG_MESSAGE_ID(SD_MESSAGE_HIBERNATE_KEY),
NULL);
manager_handle_action(b->manager, INHIBIT_HANDLE_HIBERNATE_KEY, b->manager->handle_hibernate_key, b->manager->hibernate_key_ignore_inhibited, true);
break;
}
} else if (ev.type == EV_SW && ev.value > 0) {
if (ev.code == SW_LID) {
log_struct(LOG_INFO,
LOG_MESSAGE("Lid closed."),
LOG_MESSAGE_ID(SD_MESSAGE_LID_CLOSED),
NULL);
b->lid_closed = true;
button_lid_switch_handle_action(b->manager, true);
button_install_check_event_source(b);
} else if (ev.code == SW_DOCK) {
log_struct(LOG_INFO,
LOG_MESSAGE("System docked."),
LOG_MESSAGE_ID(SD_MESSAGE_SYSTEM_DOCKED),
NULL);
b->docked = true;
}
} else if (ev.type == EV_SW && ev.value == 0) {
if (ev.code == SW_LID) {
log_struct(LOG_INFO,
LOG_MESSAGE("Lid opened."),
LOG_MESSAGE_ID(SD_MESSAGE_LID_OPENED),
NULL);
b->lid_closed = false;
b->check_event_source = sd_event_source_unref(b->check_event_source);
} else if (ev.code == SW_DOCK) {
log_struct(LOG_INFO,
LOG_MESSAGE("System undocked."),
LOG_MESSAGE_ID(SD_MESSAGE_SYSTEM_UNDOCKED),
NULL);
b->docked = false;
}
}
return 0;
}
int button_open(Button *b) {
char *p, name[256];
int r;
assert(b);
b->fd = safe_close(b->fd);
p = strjoina("/dev/input/", b->name);
b->fd = open(p, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK);
if (b->fd < 0)
return log_warning_errno(errno, "Failed to open %s: %m", b->name);
if (ioctl(b->fd, EVIOCGNAME(sizeof(name)), name) < 0) {
log_error_errno(errno, "Failed to get input name: %m");
r = -errno;
goto fail;
}
r = sd_event_add_io(b->manager->event, &b->io_event_source, b->fd, EPOLLIN, button_dispatch, b);
if (r < 0) {
log_error_errno(r, "Failed to add button event: %m");
goto fail;
}
log_info("Watching system buttons on /dev/input/%s (%s)", b->name, name);
return 0;
fail:
b->fd = safe_close(b->fd);
return r;
}
int button_check_switches(Button *b) {
uint8_t switches[SW_MAX/8+1] = {};
assert(b);
if (b->fd < 0)
return -EINVAL;
if (ioctl(b->fd, EVIOCGSW(sizeof(switches)), switches) < 0)
return -errno;
b->lid_closed = (switches[SW_LID/8] >> (SW_LID % 8)) & 1;
b->docked = (switches[SW_DOCK/8] >> (SW_DOCK % 8)) & 1;
if (b->lid_closed)
button_install_check_event_source(b);
return 0;
}