chiark / gitweb /
logind: minor cleanup and use IN_SET() in manager_handle_action()
[elogind.git] / 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 }