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-rw-r--r--src/login/logind-button.c521
1 files changed, 521 insertions, 0 deletions
diff --git a/src/login/logind-button.c b/src/login/logind-button.c
new file mode 100644
index 0000000..0314ae1
--- /dev/null
+++ b/src/login/logind-button.c
@@ -0,0 +1,521 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+
+#include "sd-messages.h"
+
+#include "alloc-util.h"
+#include "async.h"
+#include "fd-util.h"
+#include "logind-button.h"
+#include "missing_input.h"
+#include "string-util.h"
+#include "util.h"
+
+#define CONST_MAX5(a, b, c, d, e) CONST_MAX(CONST_MAX(a, b), CONST_MAX(CONST_MAX(c, d), e))
+
+#define ULONG_BITS (sizeof(unsigned long)*8)
+
+#define LONG_PRESS_DURATION (5 * USEC_PER_SEC)
+
+static bool bitset_get(const unsigned long *bits, unsigned i) {
+ return (bits[i / ULONG_BITS] >> (i % ULONG_BITS)) & 1UL;
+}
+
+static void bitset_put(unsigned long *bits, unsigned i) {
+ bits[i / ULONG_BITS] |= (unsigned long) 1 << (i % ULONG_BITS);
+}
+
+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)
+ return mfree(b);
+
+ if (hashmap_put(m->buttons, b->name, b) < 0) {
+ free(b->name);
+ return mfree(b);
+ }
+
+ 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);
+
+ asynchronous_close(b->fd);
+
+ free(b->name);
+ free(b->seat);
+ free(b);
+}
+
+int button_set_seat(Button *b, const char *sn) {
+ assert(b);
+
+ return free_and_strdup(&b->seat, sn);
+}
+
+static void button_lid_switch_handle_action(Manager *manager, bool is_edge) {
+ HandleAction handle_action;
+
+ assert(manager);
+
+ /* If we are docked or on external power, handle the lid switch
+ * differently */
+ if (manager_is_docked_or_external_displays(manager))
+ handle_action = manager->handle_lid_switch_docked;
+ else if (handle_action_valid(manager->handle_lid_switch_ep) && manager_is_on_external_power())
+ handle_action = manager->handle_lid_switch_ep;
+ 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 = ASSERT_PTR(userdata);
+
+ 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 long_press_of_power_key_handler(sd_event_source *e, uint64_t usec, void *userdata) {
+ Manager *m = ASSERT_PTR(userdata);
+
+ assert(e);
+
+ m->power_key_long_press_event_source = sd_event_source_unref(m->power_key_long_press_event_source);
+
+ log_struct(LOG_INFO,
+ LOG_MESSAGE("Power key pressed long."),
+ "MESSAGE_ID=" SD_MESSAGE_POWER_KEY_LONG_PRESS_STR);
+
+ manager_handle_action(m, INHIBIT_HANDLE_POWER_KEY, m->handle_power_key_long_press, m->power_key_ignore_inhibited, true);
+ return 0;
+}
+
+static int long_press_of_reboot_key_handler(sd_event_source *e, uint64_t usec, void *userdata) {
+ Manager *m = ASSERT_PTR(userdata);
+
+ assert(e);
+
+ m->reboot_key_long_press_event_source = sd_event_source_unref(m->reboot_key_long_press_event_source);
+
+ log_struct(LOG_INFO,
+ LOG_MESSAGE("Reboot key pressed long."),
+ "MESSAGE_ID=" SD_MESSAGE_REBOOT_KEY_LONG_PRESS_STR);
+
+ manager_handle_action(m, INHIBIT_HANDLE_REBOOT_KEY, m->handle_reboot_key_long_press, m->reboot_key_ignore_inhibited, true);
+ return 0;
+}
+
+static int long_press_of_suspend_key_handler(sd_event_source *e, uint64_t usec, void *userdata) {
+ Manager *m = ASSERT_PTR(userdata);
+
+ assert(e);
+
+ m->suspend_key_long_press_event_source = sd_event_source_unref(m->suspend_key_long_press_event_source);
+
+ log_struct(LOG_INFO,
+ LOG_MESSAGE("Suspend key pressed long."),
+ "MESSAGE_ID=" SD_MESSAGE_SUSPEND_KEY_LONG_PRESS_STR);
+
+ manager_handle_action(m, INHIBIT_HANDLE_SUSPEND_KEY, m->handle_suspend_key_long_press, m->suspend_key_ignore_inhibited, true);
+ return 0;
+}
+
+static int long_press_of_hibernate_key_handler(sd_event_source *e, uint64_t usec, void *userdata) {
+ Manager *m = ASSERT_PTR(userdata);
+
+ assert(e);
+
+ m->hibernate_key_long_press_event_source = sd_event_source_unref(m->hibernate_key_long_press_event_source);
+
+ log_struct(LOG_INFO,
+ LOG_MESSAGE("Hibernate key pressed long."),
+ "MESSAGE_ID=" SD_MESSAGE_HIBERNATE_KEY_LONG_PRESS_STR);
+
+ manager_handle_action(m, INHIBIT_HANDLE_HIBERNATE_KEY, m->handle_hibernate_key_long_press, m->hibernate_key_ignore_inhibited, true);
+ return 0;
+}
+
+static void start_long_press(Manager *m, sd_event_source **e, sd_event_time_handler_t callback) {
+ int r;
+
+ assert(m);
+ assert(e);
+
+ if (*e)
+ return;
+
+ r = sd_event_add_time_relative(
+ m->event,
+ e,
+ CLOCK_MONOTONIC,
+ LONG_PRESS_DURATION, 0,
+ callback, m);
+ if (r < 0)
+ log_warning_errno(r, "Failed to add long press timer event, ignoring: %m");
+}
+
+static int button_dispatch(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
+ Button *b = ASSERT_PTR(userdata);
+ struct input_event ev;
+ ssize_t l;
+
+ assert(s);
+ assert(fd == b->fd);
+
+ 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:
+ if (b->manager->handle_power_key_long_press != HANDLE_IGNORE && b->manager->handle_power_key_long_press != b->manager->handle_power_key) {
+ log_debug("Power key pressed. Further action depends on the key press duration.");
+ start_long_press(b->manager, &b->manager->power_key_long_press_event_source, long_press_of_power_key_handler);
+ } else {
+ log_struct(LOG_INFO,
+ LOG_MESSAGE("Power key pressed short."),
+ "MESSAGE_ID=" SD_MESSAGE_POWER_KEY_STR);
+ manager_handle_action(b->manager, INHIBIT_HANDLE_POWER_KEY, b->manager->handle_power_key, b->manager->power_key_ignore_inhibited, true);
+ }
+ break;
+
+ /* The kernel naming is a bit confusing here:
+ KEY_RESTART was probably introduced for media playback purposes, but
+ is now being predominantly used to indicate device reboot.
+ */
+
+ case KEY_RESTART:
+ if (b->manager->handle_reboot_key_long_press != HANDLE_IGNORE && b->manager->handle_reboot_key_long_press != b->manager->handle_reboot_key) {
+ log_debug("Reboot key pressed. Further action depends on the key press duration.");
+ start_long_press(b->manager, &b->manager->reboot_key_long_press_event_source, long_press_of_reboot_key_handler);
+ } else {
+ log_struct(LOG_INFO,
+ LOG_MESSAGE("Reboot key pressed short."),
+ "MESSAGE_ID=" SD_MESSAGE_REBOOT_KEY_STR);
+ manager_handle_action(b->manager, INHIBIT_HANDLE_REBOOT_KEY, b->manager->handle_reboot_key, b->manager->reboot_key_ignore_inhibited, true);
+ }
+ break;
+
+ /* The kernel naming is a bit confusing here:
+
+ KEY_SLEEP = suspend-to-ram, which everybody else calls "suspend"
+ KEY_SUSPEND = suspend-to-disk, which everybody else calls "hibernate"
+ */
+
+ case KEY_SLEEP:
+ if (b->manager->handle_suspend_key_long_press != HANDLE_IGNORE && b->manager->handle_suspend_key_long_press != b->manager->handle_suspend_key) {
+ log_debug("Suspend key pressed. Further action depends on the key press duration.");
+ start_long_press(b->manager, &b->manager->suspend_key_long_press_event_source, long_press_of_suspend_key_handler);
+ } else {
+ log_struct(LOG_INFO,
+ LOG_MESSAGE("Suspend key pressed short."),
+ "MESSAGE_ID=" SD_MESSAGE_SUSPEND_KEY_STR);
+ 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:
+ if (b->manager->handle_hibernate_key_long_press != HANDLE_IGNORE && b->manager->handle_hibernate_key_long_press != b->manager->handle_hibernate_key) {
+ log_debug("Hibernate key pressed. Further action depends on the key press duration.");
+ start_long_press(b->manager, &b->manager->hibernate_key_long_press_event_source, long_press_of_hibernate_key_handler);
+ } else {
+ log_struct(LOG_INFO,
+ LOG_MESSAGE("Hibernate key pressed short."),
+ "MESSAGE_ID=" SD_MESSAGE_HIBERNATE_KEY_STR);
+ 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_KEY && ev.value == 0) {
+
+ switch (ev.code) {
+
+ case KEY_POWER:
+ case KEY_POWER2:
+ if (b->manager->power_key_long_press_event_source) {
+ /* Long press event timer is still pending and key release
+ event happened. This means that key press duration was
+ insufficient to trigger a long press event
+ */
+ log_struct(LOG_INFO,
+ LOG_MESSAGE("Power key pressed short."),
+ "MESSAGE_ID=" SD_MESSAGE_POWER_KEY_STR);
+
+ b->manager->power_key_long_press_event_source = sd_event_source_unref(b->manager->power_key_long_press_event_source);
+
+ manager_handle_action(b->manager, INHIBIT_HANDLE_POWER_KEY, b->manager->handle_power_key, b->manager->power_key_ignore_inhibited, true);
+ }
+ break;
+
+ case KEY_RESTART:
+ if (b->manager->reboot_key_long_press_event_source) {
+ log_struct(LOG_INFO,
+ LOG_MESSAGE("Reboot key pressed short."),
+ "MESSAGE_ID=" SD_MESSAGE_REBOOT_KEY_STR);
+
+ b->manager->reboot_key_long_press_event_source = sd_event_source_unref(b->manager->reboot_key_long_press_event_source);
+
+ manager_handle_action(b->manager, INHIBIT_HANDLE_REBOOT_KEY, b->manager->handle_reboot_key, b->manager->reboot_key_ignore_inhibited, true);
+ }
+ break;
+
+ case KEY_SLEEP:
+ if (b->manager->suspend_key_long_press_event_source) {
+ log_struct(LOG_INFO,
+ LOG_MESSAGE("Suspend key pressed short."),
+ "MESSAGE_ID=" SD_MESSAGE_SUSPEND_KEY_STR);
+
+ b->manager->suspend_key_long_press_event_source = sd_event_source_unref(b->manager->suspend_key_long_press_event_source);
+
+ 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:
+ if (b->manager->hibernate_key_long_press_event_source) {
+ log_struct(LOG_INFO,
+ LOG_MESSAGE("Hibernate key pressed short."),
+ "MESSAGE_ID=" SD_MESSAGE_HIBERNATE_KEY_STR);
+
+ b->manager->hibernate_key_long_press_event_source = sd_event_source_unref(b->manager->hibernate_key_long_press_event_source);
+
+ 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."),
+ "MESSAGE_ID=" SD_MESSAGE_LID_CLOSED_STR);
+
+ 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."),
+ "MESSAGE_ID=" SD_MESSAGE_SYSTEM_DOCKED_STR);
+
+ 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."),
+ "MESSAGE_ID=" SD_MESSAGE_LID_OPENED_STR);
+
+ 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."),
+ "MESSAGE_ID=" SD_MESSAGE_SYSTEM_UNDOCKED_STR);
+
+ b->docked = false;
+ }
+ }
+
+ return 0;
+}
+
+static int button_suitable(int fd) {
+ unsigned long types[CONST_MAX(EV_KEY, EV_SW)/ULONG_BITS+1];
+
+ assert(fd >= 0);
+
+ if (ioctl(fd, EVIOCGBIT(EV_SYN, sizeof types), types) < 0)
+ return -errno;
+
+ if (bitset_get(types, EV_KEY)) {
+ unsigned long keys[CONST_MAX5(KEY_POWER, KEY_POWER2, KEY_SLEEP, KEY_SUSPEND, KEY_RESTART)/ULONG_BITS+1];
+
+ if (ioctl(fd, EVIOCGBIT(EV_KEY, sizeof keys), keys) < 0)
+ return -errno;
+
+ if (bitset_get(keys, KEY_POWER) ||
+ bitset_get(keys, KEY_POWER2) ||
+ bitset_get(keys, KEY_SLEEP) ||
+ bitset_get(keys, KEY_SUSPEND) ||
+ bitset_get(keys, KEY_RESTART))
+ return true;
+ }
+
+ if (bitset_get(types, EV_SW)) {
+ unsigned long switches[CONST_MAX(SW_LID, SW_DOCK)/ULONG_BITS+1];
+
+ if (ioctl(fd, EVIOCGBIT(EV_SW, sizeof switches), switches) < 0)
+ return -errno;
+
+ if (bitset_get(switches, SW_LID) ||
+ bitset_get(switches, SW_DOCK))
+ return true;
+ }
+
+ return false;
+}
+
+static int button_set_mask(const char *name, int fd) {
+ unsigned long
+ types[CONST_MAX(EV_KEY, EV_SW)/ULONG_BITS+1] = {},
+ keys[CONST_MAX5(KEY_POWER, KEY_POWER2, KEY_SLEEP, KEY_SUSPEND, KEY_RESTART)/ULONG_BITS+1] = {},
+ switches[CONST_MAX(SW_LID, SW_DOCK)/ULONG_BITS+1] = {};
+ struct input_mask mask;
+
+ assert(name);
+ assert(fd >= 0);
+
+ bitset_put(types, EV_KEY);
+ bitset_put(types, EV_SW);
+
+ mask = (struct input_mask) {
+ .type = EV_SYN,
+ .codes_size = sizeof(types),
+ .codes_ptr = PTR_TO_UINT64(types),
+ };
+
+ if (ioctl(fd, EVIOCSMASK, &mask) < 0)
+ /* Log only at debug level if the kernel doesn't do EVIOCSMASK yet */
+ return log_full_errno(IN_SET(errno, ENOTTY, EOPNOTSUPP, EINVAL) ? LOG_DEBUG : LOG_WARNING,
+ errno, "Failed to set EV_SYN event mask on /dev/input/%s: %m", name);
+
+ bitset_put(keys, KEY_POWER);
+ bitset_put(keys, KEY_POWER2);
+ bitset_put(keys, KEY_SLEEP);
+ bitset_put(keys, KEY_SUSPEND);
+ bitset_put(keys, KEY_RESTART);
+
+ mask = (struct input_mask) {
+ .type = EV_KEY,
+ .codes_size = sizeof(keys),
+ .codes_ptr = PTR_TO_UINT64(keys),
+ };
+
+ if (ioctl(fd, EVIOCSMASK, &mask) < 0)
+ return log_warning_errno(errno, "Failed to set EV_KEY event mask on /dev/input/%s: %m", name);
+
+ bitset_put(switches, SW_LID);
+ bitset_put(switches, SW_DOCK);
+
+ mask = (struct input_mask) {
+ .type = EV_SW,
+ .codes_size = sizeof(switches),
+ .codes_ptr = PTR_TO_UINT64(switches),
+ };
+
+ if (ioctl(fd, EVIOCSMASK, &mask) < 0)
+ return log_warning_errno(errno, "Failed to set EV_SW event mask on /dev/input/%s: %m", name);
+
+ return 0;
+}
+
+int button_open(Button *b) {
+ _cleanup_(asynchronous_closep) int fd = -1;
+ const char *p;
+ char name[256];
+ int r;
+
+ assert(b);
+
+ b->fd = asynchronous_close(b->fd);
+
+ p = strjoina("/dev/input/", b->name);
+
+ fd = open(p, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK);
+ if (fd < 0)
+ return log_warning_errno(errno, "Failed to open %s: %m", p);
+
+ r = button_suitable(fd);
+ if (r < 0)
+ return log_warning_errno(r, "Failed to determine whether input device %s is relevant to us: %m", p);
+ if (r == 0)
+ return log_debug_errno(SYNTHETIC_ERRNO(EADDRNOTAVAIL),
+ "Device %s does not expose keys or switches relevant to us, ignoring.", p);
+
+ if (ioctl(fd, EVIOCGNAME(sizeof name), name) < 0)
+ return log_error_errno(errno, "Failed to get input name for %s: %m", p);
+
+ (void) button_set_mask(b->name, fd);
+
+ b->io_event_source = sd_event_source_unref(b->io_event_source);
+ r = sd_event_add_io(b->manager->event, &b->io_event_source, fd, EPOLLIN, button_dispatch, b);
+ if (r < 0)
+ return log_error_errno(r, "Failed to add button event for %s: %m", p);
+
+ b->fd = TAKE_FD(fd);
+ log_info("Watching system buttons on %s (%s)", p, name);
+ return 0;
+}
+
+int button_check_switches(Button *b) {
+ unsigned long switches[CONST_MAX(SW_LID, SW_DOCK)/ULONG_BITS+1] = {};
+ assert(b);
+
+ if (b->fd < 0)
+ return -EINVAL;
+
+ if (ioctl(b->fd, EVIOCGSW(sizeof(switches)), switches) < 0)
+ return -errno;
+
+ b->lid_closed = bitset_get(switches, SW_LID);
+ b->docked = bitset_get(switches, SW_DOCK);
+
+ if (b->lid_closed)
+ button_install_check_event_source(b);
+
+ return 0;
+}