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.h"
21 #include "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 .energyCounter = NULL,
56 .boot_min_cap = 0,
57 .screen_on = NULL,
58 };
59
60 static int eventct;
61 static int epollfd;
62
63 #define POWER_SUPPLY_SUBSYSTEM "power_supply"
64
65 // epoll_create() parameter is actually unused
66 #define MAX_EPOLL_EVENTS 40
67 static int uevent_fd;
68 static int wakealarm_fd;
69
70 // -1 for no epoll timeout
71 static int awake_poll_interval = -1;
72
73 static int wakealarm_wake_interval = DEFAULT_PERIODIC_CHORES_INTERVAL_FAST;
74
75 static BatteryMonitor* gBatteryMonitor;
76
77 struct healthd_mode_ops *healthd_mode_ops;
78
79 // Android mode
80
81 extern void healthd_mode_android_init(struct healthd_config *config);
82 extern int healthd_mode_android_preparetowait(void);
83 extern void healthd_mode_android_battery_update(
84 struct android::BatteryProperties *props);
85
86 // Charger mode
87
88 extern void healthd_mode_charger_init(struct healthd_config *config);
89 extern int healthd_mode_charger_preparetowait(void);
90 extern void healthd_mode_charger_heartbeat(void);
91 extern void healthd_mode_charger_battery_update(
92 struct android::BatteryProperties *props);
93
94 // NOPs for modes that need no special action
95
96 static void healthd_mode_nop_init(struct healthd_config *config);
97 static int healthd_mode_nop_preparetowait(void);
98 static void healthd_mode_nop_heartbeat(void);
99 static void healthd_mode_nop_battery_update(
100 struct android::BatteryProperties *props);
101
102 static struct healthd_mode_ops android_ops = {
103 .init = healthd_mode_android_init,
104 .preparetowait = healthd_mode_android_preparetowait,
105 .heartbeat = healthd_mode_nop_heartbeat,
106 .battery_update = healthd_mode_android_battery_update,
107 };
108
109 static struct healthd_mode_ops charger_ops = {
110 .init = healthd_mode_charger_init,
111 .preparetowait = healthd_mode_charger_preparetowait,
112 .heartbeat = healthd_mode_charger_heartbeat,
113 .battery_update = healthd_mode_charger_battery_update,
114 };
115
116 static struct healthd_mode_ops recovery_ops = {
117 .init = healthd_mode_nop_init,
118 .preparetowait = healthd_mode_nop_preparetowait,
119 .heartbeat = healthd_mode_nop_heartbeat,
120 .battery_update = healthd_mode_nop_battery_update,
121 };
122
healthd_mode_nop_init(struct healthd_config *)123 static void healthd_mode_nop_init(struct healthd_config* /*config*/) {
124 }
125
healthd_mode_nop_preparetowait(void)126 static int healthd_mode_nop_preparetowait(void) {
127 return -1;
128 }
129
healthd_mode_nop_heartbeat(void)130 static void healthd_mode_nop_heartbeat(void) {
131 }
132
healthd_mode_nop_battery_update(struct android::BatteryProperties *)133 static void healthd_mode_nop_battery_update(
134 struct android::BatteryProperties* /*props*/) {
135 }
136
healthd_register_event(int fd,void (* handler)(uint32_t))137 int healthd_register_event(int fd, void (*handler)(uint32_t)) {
138 struct epoll_event ev;
139
140 ev.events = EPOLLIN | EPOLLWAKEUP;
141 ev.data.ptr = (void *)handler;
142 if (epoll_ctl(epollfd, EPOLL_CTL_ADD, fd, &ev) == -1) {
143 KLOG_ERROR(LOG_TAG,
144 "epoll_ctl failed; errno=%d\n", errno);
145 return -1;
146 }
147
148 eventct++;
149 return 0;
150 }
151
wakealarm_set_interval(int interval)152 static void wakealarm_set_interval(int interval) {
153 struct itimerspec itval;
154
155 if (wakealarm_fd == -1)
156 return;
157
158 wakealarm_wake_interval = interval;
159
160 if (interval == -1)
161 interval = 0;
162
163 itval.it_interval.tv_sec = interval;
164 itval.it_interval.tv_nsec = 0;
165 itval.it_value.tv_sec = interval;
166 itval.it_value.tv_nsec = 0;
167
168 if (timerfd_settime(wakealarm_fd, 0, &itval, NULL) == -1)
169 KLOG_ERROR(LOG_TAG, "wakealarm_set_interval: timerfd_settime failed\n");
170 }
171
healthd_get_property(int id,struct BatteryProperty * val)172 status_t healthd_get_property(int id, struct BatteryProperty *val) {
173 return gBatteryMonitor->getProperty(id, val);
174 }
175
healthd_battery_update(void)176 void healthd_battery_update(void) {
177 // Fast wake interval when on charger (watch for overheat);
178 // slow wake interval when on battery (watch for drained battery).
179
180 int new_wake_interval = gBatteryMonitor->update() ?
181 healthd_config.periodic_chores_interval_fast :
182 healthd_config.periodic_chores_interval_slow;
183
184 if (new_wake_interval != wakealarm_wake_interval)
185 wakealarm_set_interval(new_wake_interval);
186
187 // During awake periods poll at fast rate. If wake alarm is set at fast
188 // rate then just use the alarm; if wake alarm is set at slow rate then
189 // poll at fast rate while awake and let alarm wake up at slow rate when
190 // asleep.
191
192 if (healthd_config.periodic_chores_interval_fast == -1)
193 awake_poll_interval = -1;
194 else
195 awake_poll_interval =
196 new_wake_interval == healthd_config.periodic_chores_interval_fast ?
197 -1 : healthd_config.periodic_chores_interval_fast * 1000;
198 }
199
healthd_dump_battery_state(int fd)200 void healthd_dump_battery_state(int fd) {
201 gBatteryMonitor->dumpState(fd);
202 fsync(fd);
203 }
204
periodic_chores()205 static void periodic_chores() {
206 healthd_battery_update();
207 }
208
209 #define UEVENT_MSG_LEN 2048
uevent_event(uint32_t)210 static void uevent_event(uint32_t /*epevents*/) {
211 char msg[UEVENT_MSG_LEN+2];
212 char *cp;
213 int n;
214
215 n = uevent_kernel_multicast_recv(uevent_fd, msg, UEVENT_MSG_LEN);
216 if (n <= 0)
217 return;
218 if (n >= UEVENT_MSG_LEN) /* overflow -- discard */
219 return;
220
221 msg[n] = '\0';
222 msg[n+1] = '\0';
223 cp = msg;
224
225 while (*cp) {
226 if (!strcmp(cp, "SUBSYSTEM=" POWER_SUPPLY_SUBSYSTEM)) {
227 healthd_battery_update();
228 break;
229 }
230
231 /* advance to after the next \0 */
232 while (*cp++)
233 ;
234 }
235 }
236
uevent_init(void)237 static void uevent_init(void) {
238 uevent_fd = uevent_open_socket(64*1024, true);
239
240 if (uevent_fd < 0) {
241 KLOG_ERROR(LOG_TAG, "uevent_init: uevent_open_socket failed\n");
242 return;
243 }
244
245 fcntl(uevent_fd, F_SETFL, O_NONBLOCK);
246 if (healthd_register_event(uevent_fd, uevent_event))
247 KLOG_ERROR(LOG_TAG,
248 "register for uevent events failed\n");
249 }
250
wakealarm_event(uint32_t)251 static void wakealarm_event(uint32_t /*epevents*/) {
252 unsigned long long wakeups;
253
254 if (read(wakealarm_fd, &wakeups, sizeof(wakeups)) == -1) {
255 KLOG_ERROR(LOG_TAG, "wakealarm_event: read wakealarm fd failed\n");
256 return;
257 }
258
259 periodic_chores();
260 }
261
wakealarm_init(void)262 static void wakealarm_init(void) {
263 wakealarm_fd = timerfd_create(CLOCK_BOOTTIME_ALARM, TFD_NONBLOCK);
264 if (wakealarm_fd == -1) {
265 KLOG_ERROR(LOG_TAG, "wakealarm_init: timerfd_create failed\n");
266 return;
267 }
268
269 if (healthd_register_event(wakealarm_fd, wakealarm_event))
270 KLOG_ERROR(LOG_TAG,
271 "Registration of wakealarm event failed\n");
272
273 wakealarm_set_interval(healthd_config.periodic_chores_interval_fast);
274 }
275
healthd_mainloop(void)276 static void healthd_mainloop(void) {
277 while (1) {
278 struct epoll_event events[eventct];
279 int nevents;
280 int timeout = awake_poll_interval;
281 int mode_timeout;
282
283 mode_timeout = healthd_mode_ops->preparetowait();
284 if (timeout < 0 || (mode_timeout > 0 && mode_timeout < timeout))
285 timeout = mode_timeout;
286 nevents = epoll_wait(epollfd, events, eventct, timeout);
287
288 if (nevents == -1) {
289 if (errno == EINTR)
290 continue;
291 KLOG_ERROR(LOG_TAG, "healthd_mainloop: epoll_wait failed\n");
292 break;
293 }
294
295 for (int n = 0; n < nevents; ++n) {
296 if (events[n].data.ptr)
297 (*(void (*)(int))events[n].data.ptr)(events[n].events);
298 }
299
300 if (!nevents)
301 periodic_chores();
302
303 healthd_mode_ops->heartbeat();
304 }
305
306 return;
307 }
308
healthd_init()309 static int healthd_init() {
310 epollfd = epoll_create(MAX_EPOLL_EVENTS);
311 if (epollfd == -1) {
312 KLOG_ERROR(LOG_TAG,
313 "epoll_create failed; errno=%d\n",
314 errno);
315 return -1;
316 }
317
318 healthd_board_init(&healthd_config);
319 healthd_mode_ops->init(&healthd_config);
320 wakealarm_init();
321 uevent_init();
322 gBatteryMonitor = new BatteryMonitor();
323 gBatteryMonitor->init(&healthd_config);
324 return 0;
325 }
326
main(int argc,char ** argv)327 int main(int argc, char **argv) {
328 int ch;
329 int ret;
330
331 klog_set_level(KLOG_LEVEL);
332 healthd_mode_ops = &android_ops;
333
334 if (!strcmp(basename(argv[0]), "charger")) {
335 healthd_mode_ops = &charger_ops;
336 } else {
337 while ((ch = getopt(argc, argv, "cr")) != -1) {
338 switch (ch) {
339 case 'c':
340 healthd_mode_ops = &charger_ops;
341 break;
342 case 'r':
343 healthd_mode_ops = &recovery_ops;
344 break;
345 case '?':
346 default:
347 KLOG_ERROR(LOG_TAG, "Unrecognized healthd option: %c\n",
348 optopt);
349 exit(1);
350 }
351 }
352 }
353
354 ret = healthd_init();
355 if (ret) {
356 KLOG_ERROR("Initialization failed, exiting\n");
357 exit(2);
358 }
359
360 healthd_mainloop();
361 KLOG_ERROR("Main loop terminated, exiting\n");
362 return 3;
363 }
364