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