1 /*
2 * Copyright (C) 2013 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #define LOG_TAG "healthd"
18 #define KLOG_LEVEL 6
19
20 #include <healthd/healthd.h>
21 #include <healthd/BatteryMonitor.h>
22
23 #include <errno.h>
24 #include <libgen.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <string.h>
28 #include <unistd.h>
29 #include <batteryservice/BatteryService.h>
30 #include <cutils/klog.h>
31 #include <cutils/uevent.h>
32 #include <sys/epoll.h>
33 #include <sys/timerfd.h>
34 #include <utils/Errors.h>
35
36 using namespace android;
37
38 // Periodic chores intervals in seconds
39 #define DEFAULT_PERIODIC_CHORES_INTERVAL_FAST (60 * 1)
40 #define DEFAULT_PERIODIC_CHORES_INTERVAL_SLOW (60 * 10)
41
42 static struct healthd_config healthd_config = {
43 .periodic_chores_interval_fast = DEFAULT_PERIODIC_CHORES_INTERVAL_FAST,
44 .periodic_chores_interval_slow = DEFAULT_PERIODIC_CHORES_INTERVAL_SLOW,
45 .batteryStatusPath = String8(String8::kEmptyString),
46 .batteryHealthPath = String8(String8::kEmptyString),
47 .batteryPresentPath = String8(String8::kEmptyString),
48 .batteryCapacityPath = String8(String8::kEmptyString),
49 .batteryVoltagePath = String8(String8::kEmptyString),
50 .batteryTemperaturePath = String8(String8::kEmptyString),
51 .batteryTechnologyPath = String8(String8::kEmptyString),
52 .batteryCurrentNowPath = String8(String8::kEmptyString),
53 .batteryCurrentAvgPath = String8(String8::kEmptyString),
54 .batteryChargeCounterPath = String8(String8::kEmptyString),
55 .batteryFullChargePath = String8(String8::kEmptyString),
56 .batteryCycleCountPath = String8(String8::kEmptyString),
57 .energyCounter = NULL,
58 .boot_min_cap = 0,
59 .screen_on = NULL,
60 };
61
62 static int eventct;
63 static int epollfd;
64
65 #define POWER_SUPPLY_SUBSYSTEM "power_supply"
66
67 // epoll_create() parameter is actually unused
68 #define MAX_EPOLL_EVENTS 40
69 static int uevent_fd;
70 static int wakealarm_fd;
71
72 // -1 for no epoll timeout
73 static int awake_poll_interval = -1;
74
75 static int wakealarm_wake_interval = DEFAULT_PERIODIC_CHORES_INTERVAL_FAST;
76
77 static BatteryMonitor* gBatteryMonitor;
78
79 struct healthd_mode_ops *healthd_mode_ops;
80
81 // Android mode
82
83 extern void healthd_mode_android_init(struct healthd_config *config);
84 extern int healthd_mode_android_preparetowait(void);
85 extern void healthd_mode_android_battery_update(
86 struct android::BatteryProperties *props);
87
88 // Charger mode
89
90 extern void healthd_mode_charger_init(struct healthd_config *config);
91 extern int healthd_mode_charger_preparetowait(void);
92 extern void healthd_mode_charger_heartbeat(void);
93 extern void healthd_mode_charger_battery_update(
94 struct android::BatteryProperties *props);
95
96 // NOPs for modes that need no special action
97
98 static void healthd_mode_nop_init(struct healthd_config *config);
99 static int healthd_mode_nop_preparetowait(void);
100 static void healthd_mode_nop_heartbeat(void);
101 static void healthd_mode_nop_battery_update(
102 struct android::BatteryProperties *props);
103
104 static struct healthd_mode_ops android_ops = {
105 .init = healthd_mode_android_init,
106 .preparetowait = healthd_mode_android_preparetowait,
107 .heartbeat = healthd_mode_nop_heartbeat,
108 .battery_update = healthd_mode_android_battery_update,
109 };
110
111 static struct healthd_mode_ops charger_ops = {
112 .init = healthd_mode_charger_init,
113 .preparetowait = healthd_mode_charger_preparetowait,
114 .heartbeat = healthd_mode_charger_heartbeat,
115 .battery_update = healthd_mode_charger_battery_update,
116 };
117
118 static struct healthd_mode_ops recovery_ops = {
119 .init = healthd_mode_nop_init,
120 .preparetowait = healthd_mode_nop_preparetowait,
121 .heartbeat = healthd_mode_nop_heartbeat,
122 .battery_update = healthd_mode_nop_battery_update,
123 };
124
healthd_mode_nop_init(struct healthd_config *)125 static void healthd_mode_nop_init(struct healthd_config* /*config*/) {
126 }
127
healthd_mode_nop_preparetowait(void)128 static int healthd_mode_nop_preparetowait(void) {
129 return -1;
130 }
131
healthd_mode_nop_heartbeat(void)132 static void healthd_mode_nop_heartbeat(void) {
133 }
134
healthd_mode_nop_battery_update(struct android::BatteryProperties *)135 static void healthd_mode_nop_battery_update(
136 struct android::BatteryProperties* /*props*/) {
137 }
138
healthd_register_event(int fd,void (* handler)(uint32_t))139 int healthd_register_event(int fd, void (*handler)(uint32_t)) {
140 struct epoll_event ev;
141
142 ev.events = EPOLLIN | EPOLLWAKEUP;
143 ev.data.ptr = (void *)handler;
144 if (epoll_ctl(epollfd, EPOLL_CTL_ADD, fd, &ev) == -1) {
145 KLOG_ERROR(LOG_TAG,
146 "epoll_ctl failed; errno=%d\n", errno);
147 return -1;
148 }
149
150 eventct++;
151 return 0;
152 }
153
wakealarm_set_interval(int interval)154 static void wakealarm_set_interval(int interval) {
155 struct itimerspec itval;
156
157 if (wakealarm_fd == -1)
158 return;
159
160 wakealarm_wake_interval = interval;
161
162 if (interval == -1)
163 interval = 0;
164
165 itval.it_interval.tv_sec = interval;
166 itval.it_interval.tv_nsec = 0;
167 itval.it_value.tv_sec = interval;
168 itval.it_value.tv_nsec = 0;
169
170 if (timerfd_settime(wakealarm_fd, 0, &itval, NULL) == -1)
171 KLOG_ERROR(LOG_TAG, "wakealarm_set_interval: timerfd_settime failed\n");
172 }
173
healthd_get_property(int id,struct BatteryProperty * val)174 status_t healthd_get_property(int id, struct BatteryProperty *val) {
175 return gBatteryMonitor->getProperty(id, val);
176 }
177
healthd_battery_update(void)178 void healthd_battery_update(void) {
179 // Fast wake interval when on charger (watch for overheat);
180 // slow wake interval when on battery (watch for drained battery).
181
182 int new_wake_interval = gBatteryMonitor->update() ?
183 healthd_config.periodic_chores_interval_fast :
184 healthd_config.periodic_chores_interval_slow;
185
186 if (new_wake_interval != wakealarm_wake_interval)
187 wakealarm_set_interval(new_wake_interval);
188
189 // During awake periods poll at fast rate. If wake alarm is set at fast
190 // rate then just use the alarm; if wake alarm is set at slow rate then
191 // poll at fast rate while awake and let alarm wake up at slow rate when
192 // asleep.
193
194 if (healthd_config.periodic_chores_interval_fast == -1)
195 awake_poll_interval = -1;
196 else
197 awake_poll_interval =
198 new_wake_interval == healthd_config.periodic_chores_interval_fast ?
199 -1 : healthd_config.periodic_chores_interval_fast * 1000;
200 }
201
healthd_dump_battery_state(int fd)202 void healthd_dump_battery_state(int fd) {
203 gBatteryMonitor->dumpState(fd);
204 fsync(fd);
205 }
206
periodic_chores()207 static void periodic_chores() {
208 healthd_battery_update();
209 }
210
211 #define UEVENT_MSG_LEN 2048
uevent_event(uint32_t)212 static void uevent_event(uint32_t /*epevents*/) {
213 char msg[UEVENT_MSG_LEN+2];
214 char *cp;
215 int n;
216
217 n = uevent_kernel_multicast_recv(uevent_fd, msg, UEVENT_MSG_LEN);
218 if (n <= 0)
219 return;
220 if (n >= UEVENT_MSG_LEN) /* overflow -- discard */
221 return;
222
223 msg[n] = '\0';
224 msg[n+1] = '\0';
225 cp = msg;
226
227 while (*cp) {
228 if (!strcmp(cp, "SUBSYSTEM=" POWER_SUPPLY_SUBSYSTEM)) {
229 healthd_battery_update();
230 break;
231 }
232
233 /* advance to after the next \0 */
234 while (*cp++)
235 ;
236 }
237 }
238
uevent_init(void)239 static void uevent_init(void) {
240 uevent_fd = uevent_open_socket(64*1024, true);
241
242 if (uevent_fd < 0) {
243 KLOG_ERROR(LOG_TAG, "uevent_init: uevent_open_socket failed\n");
244 return;
245 }
246
247 fcntl(uevent_fd, F_SETFL, O_NONBLOCK);
248 if (healthd_register_event(uevent_fd, uevent_event))
249 KLOG_ERROR(LOG_TAG,
250 "register for uevent events failed\n");
251 }
252
wakealarm_event(uint32_t)253 static void wakealarm_event(uint32_t /*epevents*/) {
254 unsigned long long wakeups;
255
256 if (read(wakealarm_fd, &wakeups, sizeof(wakeups)) == -1) {
257 KLOG_ERROR(LOG_TAG, "wakealarm_event: read wakealarm fd failed\n");
258 return;
259 }
260
261 periodic_chores();
262 }
263
wakealarm_init(void)264 static void wakealarm_init(void) {
265 wakealarm_fd = timerfd_create(CLOCK_BOOTTIME_ALARM, TFD_NONBLOCK);
266 if (wakealarm_fd == -1) {
267 KLOG_ERROR(LOG_TAG, "wakealarm_init: timerfd_create failed\n");
268 return;
269 }
270
271 if (healthd_register_event(wakealarm_fd, wakealarm_event))
272 KLOG_ERROR(LOG_TAG,
273 "Registration of wakealarm event failed\n");
274
275 wakealarm_set_interval(healthd_config.periodic_chores_interval_fast);
276 }
277
healthd_mainloop(void)278 static void healthd_mainloop(void) {
279 while (1) {
280 struct epoll_event events[eventct];
281 int nevents;
282 int timeout = awake_poll_interval;
283 int mode_timeout;
284
285 mode_timeout = healthd_mode_ops->preparetowait();
286 if (timeout < 0 || (mode_timeout > 0 && mode_timeout < timeout))
287 timeout = mode_timeout;
288 nevents = epoll_wait(epollfd, events, eventct, timeout);
289
290 if (nevents == -1) {
291 if (errno == EINTR)
292 continue;
293 KLOG_ERROR(LOG_TAG, "healthd_mainloop: epoll_wait failed\n");
294 break;
295 }
296
297 for (int n = 0; n < nevents; ++n) {
298 if (events[n].data.ptr)
299 (*(void (*)(int))events[n].data.ptr)(events[n].events);
300 }
301
302 if (!nevents)
303 periodic_chores();
304
305 healthd_mode_ops->heartbeat();
306 }
307
308 return;
309 }
310
healthd_init()311 static int healthd_init() {
312 epollfd = epoll_create(MAX_EPOLL_EVENTS);
313 if (epollfd == -1) {
314 KLOG_ERROR(LOG_TAG,
315 "epoll_create failed; errno=%d\n",
316 errno);
317 return -1;
318 }
319
320 healthd_board_init(&healthd_config);
321 healthd_mode_ops->init(&healthd_config);
322 wakealarm_init();
323 uevent_init();
324 gBatteryMonitor = new BatteryMonitor();
325 gBatteryMonitor->init(&healthd_config);
326 return 0;
327 }
328
main(int argc,char ** argv)329 int main(int argc, char **argv) {
330 int ch;
331 int ret;
332
333 klog_set_level(KLOG_LEVEL);
334 healthd_mode_ops = &android_ops;
335
336 if (!strcmp(basename(argv[0]), "charger")) {
337 healthd_mode_ops = &charger_ops;
338 } else {
339 while ((ch = getopt(argc, argv, "cr")) != -1) {
340 switch (ch) {
341 case 'c':
342 healthd_mode_ops = &charger_ops;
343 break;
344 case 'r':
345 healthd_mode_ops = &recovery_ops;
346 break;
347 case '?':
348 default:
349 KLOG_ERROR(LOG_TAG, "Unrecognized healthd option: %c\n",
350 optopt);
351 exit(1);
352 }
353 }
354 }
355
356 ret = healthd_init();
357 if (ret) {
358 KLOG_ERROR("Initialization failed, exiting\n");
359 exit(2);
360 }
361
362 healthd_mainloop();
363 KLOG_ERROR("Main loop terminated, exiting\n");
364 return 3;
365 }
366