[thirdparty/systemd.git] / src / login / logind-button.c

/* SPDX-License-Identifier: LGPL-2.1+ */

#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <linux/input.h>

#include "sd-messages.h"

#include "alloc-util.h"
#include "fd-util.h"
#include "logind-button.h"
#include "string-util.h"
#include "util.h"

#define CONST_MAX4(a, b, c, d) CONST_MAX(CONST_MAX(a, b), CONST_MAX(c, d))

#define ULONG_BITS (sizeof(unsigned long)*8)

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);

        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 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 (manager->handle_lid_switch_ep != _HANDLE_ACTION_INVALID &&
                 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 = 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."),
                                   "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 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."),
                                   "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:
                        log_struct(LOG_INFO,
                                   LOG_MESSAGE("Hibernate key pressed."),
                                   "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_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(Button *b) {
        unsigned long types[CONST_MAX(EV_KEY, EV_SW)/ULONG_BITS+1];

        assert(b);
        assert(b->fd);

        if (ioctl(b->fd, EVIOCGBIT(EV_SYN, sizeof(types)), types) < 0)
                return -errno;

        if (bitset_get(types, EV_KEY)) {
                unsigned long keys[CONST_MAX4(KEY_POWER, KEY_POWER2, KEY_SLEEP, KEY_SUSPEND)/ULONG_BITS+1];

                if (ioctl(b->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))
                        return true;
        }

        if (bitset_get(types, EV_SW)) {
                unsigned long switches[CONST_MAX(SW_LID, SW_DOCK)/ULONG_BITS+1];

                if (ioctl(b->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(Button *b) {
        unsigned long
                types[CONST_MAX(EV_KEY, EV_SW)/ULONG_BITS+1] = {},
                keys[CONST_MAX4(KEY_POWER, KEY_POWER2, KEY_SLEEP, KEY_SUSPEND)/ULONG_BITS+1] = {},
                switches[CONST_MAX(SW_LID, SW_DOCK)/ULONG_BITS+1] = {};
        struct input_mask mask;

        assert(b);
        assert(b->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(b->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", b->name);

        bitset_put(keys, KEY_POWER);
        bitset_put(keys, KEY_POWER2);
        bitset_put(keys, KEY_SLEEP);
        bitset_put(keys, KEY_SUSPEND);

        mask = (struct input_mask) {
                .type = EV_KEY,
                .codes_size = sizeof(keys),
                .codes_ptr = PTR_TO_UINT64(keys),
        };

        if (ioctl(b->fd, EVIOCSMASK, &mask) < 0)
                return log_warning_errno(errno, "Failed to set EV_KEY event mask on /dev/input/%s: %m", b->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(b->fd, EVIOCSMASK, &mask) < 0)
                return log_warning_errno(errno, "Failed to set EV_SW event mask on /dev/input/%s: %m", b->name);

        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", p);

        r = button_suitable(b);
        if (r < 0)
                return log_warning_errno(r, "Failed to determine whether input device is relevant to us: %m");
        if (r == 0) {
                log_debug("Device %s does not expose keys or switches relevant to us, ignoring.", p);
                return -EADDRNOTAVAIL;
        }

        if (ioctl(b->fd, EVIOCGNAME(sizeof(name)), name) < 0) {
                r = log_error_errno(errno, "Failed to get input name: %m");
                goto fail;
        }

        (void) button_set_mask(b);

        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) {
        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;
}
Commit	Line	Data
53e1b683	1	/* SPDX-License-Identifier: LGPL-2.1+ */
e9d21f24	2
e9d21f24 LP	3	#include <errno.h>
e9d21f24 LP	4	#include <fcntl.h>
07630cea	5	#include <string.h>
e9d21f24 LP	6	#include <sys/ioctl.h>
	7	#include <unistd.h>
	8	#include <linux/input.h>
e9d21f24	9
cc377381	10	#include "sd-messages.h"
07630cea	11
b5efdb8a	12	#include "alloc-util.h"
3ffd4af2 LP	13	#include "fd-util.h"
3ffd4af2 LP	14	#include "logind-button.h"
07630cea	15	#include "string-util.h"
e9d21f24	16	#include "util.h"
e9d21f24	17
d5dd44b0 LP	18	#define CONST_MAX4(a, b, c, d) CONST_MAX(CONST_MAX(a, b), CONST_MAX(c, d))
	19
	20	#define ULONG_BITS (sizeof(unsigned long)*8)
	21
	22	static bool bitset_get(const unsigned long *bits, unsigned i) {
	23	return (bits[i / ULONG_BITS] >> (i % ULONG_BITS)) & 1UL;
	24	}
	25
	26	static void bitset_put(unsigned long *bits, unsigned i) {
	27	bits[i / ULONG_BITS] \|= (unsigned long) 1 << (i % ULONG_BITS);
	28	}
	29
e9d21f24 LP	30	Button* button_new(Manager m, const char name) {
	31	Button *b;
	32
	33	assert(m);
	34	assert(name);
	35
	36	b = new0(Button, 1);
	37	if (!b)
	38	return NULL;
	39
	40	b->name = strdup(name);
6b430fdb ZJS	41	if (!b->name)
6b430fdb ZJS	42	return mfree(b);
e9d21f24 LP	43
	44	if (hashmap_put(m->buttons, b->name, b) < 0) {
	45	free(b->name);
6b430fdb	46	return mfree(b);
e9d21f24 LP	47	}
	48
	49	b->manager = m;
	50	b->fd = -1;
	51
	52	return b;
	53	}
	54
	55	void button_free(Button *b) {
	56	assert(b);
	57
	58	hashmap_remove(b->manager->buttons, b->name);
	59
ed4ba7e4 LP	60	sd_event_source_unref(b->io_event_source);
ed4ba7e4 LP	61	sd_event_source_unref(b->check_event_source);
c30a0c62	62
ece174c5	63	if (b->fd >= 0)
c30a0c62 LP	64	/* If the device has been unplugged close() returns
c30a0c62 LP	65	* ENODEV, let's ignore this, hence we don't use
03e334a1	66	* safe_close() */
4fba5796	67	(void) close(b->fd);
e9d21f24 LP	68
	69	free(b->name);
	70	free(b->seat);
	71	free(b);
	72	}
	73
	74	int button_set_seat(Button b, const char sn) {
	75	char *s;
	76
	77	assert(b);
	78	assert(sn);
	79
	80	s = strdup(sn);
	81	if (!s)
	82	return -ENOMEM;
	83
	84	free(b->seat);
	85	b->seat = s;
	86
	87	return 0;
	88	}
	89
3c56cab4 BW	90	static void button_lid_switch_handle_action(Manager *manager, bool is_edge) {
	91	HandleAction handle_action;
	92
	93	assert(manager);
	94
e25937a3 SF	95	/* If we are docked or on external power, handle the lid switch
e25937a3 SF	96	* differently */
602a41c2	97	if (manager_is_docked_or_external_displays(manager))
3c56cab4	98	handle_action = manager->handle_lid_switch_docked;
e25937a3 SF	99	else if (manager->handle_lid_switch_ep != _HANDLE_ACTION_INVALID &&
	100	manager_is_on_external_power())
	101	handle_action = manager->handle_lid_switch_ep;
3c56cab4 BW	102	else
	103	handle_action = manager->handle_lid_switch;
	104
	105	manager_handle_action(manager, INHIBIT_HANDLE_LID_SWITCH, handle_action, manager->lid_switch_ignore_inhibited, is_edge);
	106	}
	107
ed4ba7e4 LP	108	static int button_recheck(sd_event_source e, void userdata) {
ed4ba7e4 LP	109	Button *b = userdata;
beaafb2e	110
ed4ba7e4 LP	111	assert(b);
	112	assert(b->lid_closed);
	113
3c56cab4	114	button_lid_switch_handle_action(b->manager, false);
ed4ba7e4 LP	115	return 1;
ed4ba7e4 LP	116	}
e9d21f24	117
ed4ba7e4 LP	118	static int button_install_check_event_source(Button *b) {
ed4ba7e4 LP	119	int r;
e9d21f24 LP	120	assert(b);
e9d21f24 LP	121
ed4ba7e4	122	/* Install a post handler, so that we keep rechecking as long as the lid is closed. */
6de0e0e5	123
ed4ba7e4 LP	124	if (b->check_event_source)
	125	return 0;
	126
	127	r = sd_event_add_post(b->manager->event, &b->check_event_source, button_recheck, b);
	128	if (r < 0)
	129	return r;
	130
	131	return sd_event_source_set_priority(b->check_event_source, SD_EVENT_PRIORITY_IDLE+1);
e9d21f24 LP	132	}
e9d21f24 LP	133
cc377381 LP	134	static int button_dispatch(sd_event_source s, int fd, uint32_t revents, void userdata) {
cc377381 LP	135	Button *b = userdata;
e9d21f24 LP	136	struct input_event ev;
	137	ssize_t l;
	138
cc377381 LP	139	assert(s);
cc377381 LP	140	assert(fd == b->fd);
e9d21f24 LP	141	assert(b);
	142
	143	l = read(b->fd, &ev, sizeof(ev));
	144	if (l < 0)
	145	return errno != EAGAIN ? -errno : 0;
	146	if ((size_t) l < sizeof(ev))
	147	return -EIO;
	148
e9d21f24 LP	149	if (ev.type == EV_KEY && ev.value > 0) {
	150
	151	switch (ev.code) {
	152
	153	case KEY_POWER:
	154	case KEY_POWER2:
c485437f	155	log_struct(LOG_INFO,
e2cc6eca	156	LOG_MESSAGE("Power key pressed."),
a1230ff9	157	"MESSAGE_ID=" SD_MESSAGE_POWER_KEY_STR);
7b77ed8c	158
ed4ba7e4	159	manager_handle_action(b->manager, INHIBIT_HANDLE_POWER_KEY, b->manager->handle_power_key, b->manager->power_key_ignore_inhibited, true);
7b77ed8c	160	break;
e9d21f24	161
8e7fd6ad LP	162	/* The kernel is a bit confused here:
	163
	164	KEY_SLEEP = suspend-to-ram, which everybody else calls "suspend"
	165	KEY_SUSPEND = suspend-to-disk, which everybody else calls "hibernate"
	166	*/
	167
e9d21f24	168	case KEY_SLEEP:
c485437f	169	log_struct(LOG_INFO,
e2cc6eca	170	LOG_MESSAGE("Suspend key pressed."),
a1230ff9	171	"MESSAGE_ID=" SD_MESSAGE_SUSPEND_KEY_STR);
7b77ed8c	172
ed4ba7e4	173	manager_handle_action(b->manager, INHIBIT_HANDLE_SUSPEND_KEY, b->manager->handle_suspend_key, b->manager->suspend_key_ignore_inhibited, true);
7b77ed8c	174	break;
e9d21f24	175
8e7fd6ad	176	case KEY_SUSPEND:
c485437f	177	log_struct(LOG_INFO,
e2cc6eca	178	LOG_MESSAGE("Hibernate key pressed."),
a1230ff9	179	"MESSAGE_ID=" SD_MESSAGE_HIBERNATE_KEY_STR);
7b77ed8c	180
ed4ba7e4	181	manager_handle_action(b->manager, INHIBIT_HANDLE_HIBERNATE_KEY, b->manager->handle_hibernate_key, b->manager->hibernate_key_ignore_inhibited, true);
7b77ed8c	182	break;
e9d21f24	183	}
8e7fd6ad	184
e9d21f24 LP	185	} else if (ev.type == EV_SW && ev.value > 0) {
e9d21f24 LP	186
7b77ed8c	187	if (ev.code == SW_LID) {
c485437f	188	log_struct(LOG_INFO,
e2cc6eca	189	LOG_MESSAGE("Lid closed."),
a1230ff9	190	"MESSAGE_ID=" SD_MESSAGE_LID_CLOSED_STR);
65b51162	191
ed4ba7e4	192	b->lid_closed = true;
3c56cab4	193	button_lid_switch_handle_action(b->manager, true);
ed4ba7e4	194	button_install_check_event_source(b);
2d62c530 LP	195
	196	} else if (ev.code == SW_DOCK) {
	197	log_struct(LOG_INFO,
e2cc6eca	198	LOG_MESSAGE("System docked."),
a1230ff9	199	"MESSAGE_ID=" SD_MESSAGE_SYSTEM_DOCKED_STR);
2d62c530 LP	200
2d62c530 LP	201	b->docked = true;
65b51162 LP	202	}
	203
	204	} else if (ev.type == EV_SW && ev.value == 0) {
	205
7b77ed8c	206	if (ev.code == SW_LID) {
c485437f	207	log_struct(LOG_INFO,
e2cc6eca	208	LOG_MESSAGE("Lid opened."),
a1230ff9	209	"MESSAGE_ID=" SD_MESSAGE_LID_OPENED_STR);
7b77ed8c	210
ed4ba7e4 LP	211	b->lid_closed = false;
ed4ba7e4 LP	212	b->check_event_source = sd_event_source_unref(b->check_event_source);
2d62c530 LP	213
	214	} else if (ev.code == SW_DOCK) {
	215	log_struct(LOG_INFO,
e2cc6eca	216	LOG_MESSAGE("System undocked."),
a1230ff9	217	"MESSAGE_ID=" SD_MESSAGE_SYSTEM_UNDOCKED_STR);
2d62c530 LP	218
2d62c530 LP	219	b->docked = false;
e9d21f24 LP	220	}
	221	}
	222
	223	return 0;
	224	}
	225
2546b70a LP	226	static int button_suitable(Button *b) {
	227	unsigned long types[CONST_MAX(EV_KEY, EV_SW)/ULONG_BITS+1];
	228
	229	assert(b);
	230	assert(b->fd);
	231
	232	if (ioctl(b->fd, EVIOCGBIT(EV_SYN, sizeof(types)), types) < 0)
	233	return -errno;
	234
	235	if (bitset_get(types, EV_KEY)) {
	236	unsigned long keys[CONST_MAX4(KEY_POWER, KEY_POWER2, KEY_SLEEP, KEY_SUSPEND)/ULONG_BITS+1];
	237
	238	if (ioctl(b->fd, EVIOCGBIT(EV_KEY, sizeof(keys)), keys) < 0)
	239	return -errno;
	240
	241	if (bitset_get(keys, KEY_POWER) \|\|
	242	bitset_get(keys, KEY_POWER2) \|\|
	243	bitset_get(keys, KEY_SLEEP) \|\|
	244	bitset_get(keys, KEY_SUSPEND))
	245	return true;
	246	}
	247
	248	if (bitset_get(types, EV_SW)) {
	249	unsigned long switches[CONST_MAX(SW_LID, SW_DOCK)/ULONG_BITS+1];
	250
	251	if (ioctl(b->fd, EVIOCGBIT(EV_SW, sizeof(switches)), switches) < 0)
	252	return -errno;
	253
	254	if (bitset_get(switches, SW_LID) \|\|
	255	bitset_get(switches, SW_DOCK))
	256	return true;
	257	}
	258
	259	return false;
	260	}
	261
d5dd44b0 LP	262	static int button_set_mask(Button *b) {
	263	unsigned long
	264	types[CONST_MAX(EV_KEY, EV_SW)/ULONG_BITS+1] = {},
	265	keys[CONST_MAX4(KEY_POWER, KEY_POWER2, KEY_SLEEP, KEY_SUSPEND)/ULONG_BITS+1] = {},
	266	switches[CONST_MAX(SW_LID, SW_DOCK)/ULONG_BITS+1] = {};
	267	struct input_mask mask;
	268
	269	assert(b);
	270	assert(b->fd >= 0);
	271
	272	bitset_put(types, EV_KEY);
	273	bitset_put(types, EV_SW);
	274
	275	mask = (struct input_mask) {
	276	.type = EV_SYN,
	277	.codes_size = sizeof(types),
	278	.codes_ptr = PTR_TO_UINT64(types),
	279	};
	280
	281	if (ioctl(b->fd, EVIOCSMASK, &mask) < 0)
	282	/* Log only at debug level if the kernel doesn't do EVIOCSMASK yet */
	283	return log_full_errno(IN_SET(errno, ENOTTY, EOPNOTSUPP, EINVAL) ? LOG_DEBUG : LOG_WARNING,
	284	errno, "Failed to set EV_SYN event mask on /dev/input/%s: %m", b->name);
	285
	286	bitset_put(keys, KEY_POWER);
	287	bitset_put(keys, KEY_POWER2);
	288	bitset_put(keys, KEY_SLEEP);
	289	bitset_put(keys, KEY_SUSPEND);
	290
	291	mask = (struct input_mask) {
	292	.type = EV_KEY,
	293	.codes_size = sizeof(keys),
	294	.codes_ptr = PTR_TO_UINT64(keys),
	295	};
	296
	297	if (ioctl(b->fd, EVIOCSMASK, &mask) < 0)
	298	return log_warning_errno(errno, "Failed to set EV_KEY event mask on /dev/input/%s: %m", b->name);
	299
	300	bitset_put(switches, SW_LID);
	301	bitset_put(switches, SW_DOCK);
	302
	303	mask = (struct input_mask) {
	304	.type = EV_SW,
	305	.codes_size = sizeof(switches),
	306	.codes_ptr = PTR_TO_UINT64(switches),
	307	};
	308
	309	if (ioctl(b->fd, EVIOCSMASK, &mask) < 0)
	310	return log_warning_errno(errno, "Failed to set EV_SW event mask on /dev/input/%s: %m", b->name);
	311
	312	return 0;
	313	}
	314
cc377381 LP	315	int button_open(Button *b) {
	316	char *p, name[256];
	317	int r;
	318
	319	assert(b);
	320
7f6e12b0	321	b->fd = safe_close(b->fd);
cc377381	322
63c372cb	323	p = strjoina("/dev/input/", b->name);
cc377381 LP	324
cc377381 LP	325	b->fd = open(p, O_RDWR\|O_CLOEXEC\|O_NOCTTY\|O_NONBLOCK);
4a62c710	326	if (b->fd < 0)
2546b70a LP	327	return log_warning_errno(errno, "Failed to open %s: %m", p);
	328
	329	r = button_suitable(b);
	330	if (r < 0)
	331	return log_warning_errno(r, "Failed to determine whether input device is relevant to us: %m");
	332	if (r == 0) {
	333	log_debug("Device %s does not expose keys or switches relevant to us, ignoring.", p);
	334	return -EADDRNOTAVAIL;
	335	}
cc377381 LP	336
cc377381 LP	337	if (ioctl(b->fd, EVIOCGNAME(sizeof(name)), name) < 0) {
76ef789d	338	r = log_error_errno(errno, "Failed to get input name: %m");
cc377381 LP	339	goto fail;
	340	}
	341
d5dd44b0 LP	342	(void) button_set_mask(b);
d5dd44b0 LP	343
ed4ba7e4	344	r = sd_event_add_io(b->manager->event, &b->io_event_source, b->fd, EPOLLIN, button_dispatch, b);
cc377381	345	if (r < 0) {
da927ba9	346	log_error_errno(r, "Failed to add button event: %m");
cc377381 LP	347	goto fail;
	348	}
	349
	350	log_info("Watching system buttons on /dev/input/%s (%s)", b->name, name);
	351
	352	return 0;
	353
	354	fail:
66e40583	355	b->fd = safe_close(b->fd);
cc377381 LP	356	return r;
	357	}
	358
2d62c530	359	int button_check_switches(Button *b) {
d5dd44b0	360	unsigned long switches[CONST_MAX(SW_LID, SW_DOCK)/ULONG_BITS+1] = {};
65b51162 LP	361	assert(b);
65b51162 LP	362
ed4ba7e4 LP	363	if (b->fd < 0)
	364	return -EINVAL;
	365
	366	if (ioctl(b->fd, EVIOCGSW(sizeof(switches)), switches) < 0)
	367	return -errno;
65b51162	368
d5dd44b0 LP	369	b->lid_closed = bitset_get(switches, SW_LID);
d5dd44b0 LP	370	b->docked = bitset_get(switches, SW_DOCK);
ed4ba7e4	371
2d62c530	372	if (b->lid_closed)
ed4ba7e4	373	button_install_check_event_source(b);
ed4ba7e4 LP	374
ed4ba7e4 LP	375	return 0;
65b51162	376	}