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-common"
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 #ifndef BOARD_PERIODIC_CHORES_INTERVAL_FAST
39 // Periodic chores fast interval in seconds
40 #define DEFAULT_PERIODIC_CHORES_INTERVAL_FAST (60 * 1)
41 #else
42 #define DEFAULT_PERIODIC_CHORES_INTERVAL_FAST (BOARD_PERIODIC_CHORES_INTERVAL_FAST)
43 #endif
44
45 #ifndef BOARD_PERIODIC_CHORES_INTERVAL_SLOW
46 // Periodic chores fast interval in seconds
47 #define DEFAULT_PERIODIC_CHORES_INTERVAL_SLOW (60 * 10)
48 #else
49 #define DEFAULT_PERIODIC_CHORES_INTERVAL_SLOW (BOARD_PERIODIC_CHORES_INTERVAL_SLOW)
50 #endif
51
52 static struct healthd_config healthd_config = {
53 .periodic_chores_interval_fast = DEFAULT_PERIODIC_CHORES_INTERVAL_FAST,
54 .periodic_chores_interval_slow = DEFAULT_PERIODIC_CHORES_INTERVAL_SLOW,
55 .batteryStatusPath = String8(String8::kEmptyString),
56 .batteryHealthPath = String8(String8::kEmptyString),
57 .batteryPresentPath = String8(String8::kEmptyString),
58 .batteryCapacityPath = String8(String8::kEmptyString),
59 .batteryVoltagePath = String8(String8::kEmptyString),
60 .batteryTemperaturePath = String8(String8::kEmptyString),
61 .batteryTechnologyPath = String8(String8::kEmptyString),
62 .batteryCurrentNowPath = String8(String8::kEmptyString),
63 .batteryCurrentAvgPath = String8(String8::kEmptyString),
64 .batteryChargeCounterPath = String8(String8::kEmptyString),
65 .batteryFullChargePath = String8(String8::kEmptyString),
66 .batteryCycleCountPath = String8(String8::kEmptyString),
67 .energyCounter = NULL,
68 .boot_min_cap = 0,
69 .screen_on = NULL,
70 };
71
72 static int eventct;
73 static int epollfd;
74
75 #define POWER_SUPPLY_SUBSYSTEM "power_supply"
76
77 // epoll_create() parameter is actually unused
78 #define MAX_EPOLL_EVENTS 40
79 static int uevent_fd;
80 static int wakealarm_fd;
81
82 // -1 for no epoll timeout
83 static int awake_poll_interval = -1;
84
85 static int wakealarm_wake_interval = DEFAULT_PERIODIC_CHORES_INTERVAL_FAST;
86
87 static BatteryMonitor* gBatteryMonitor;
88
89 struct healthd_mode_ops *healthd_mode_ops;
90
healthd_register_event(int fd,void (* handler)(uint32_t),EventWakeup wakeup)91 int healthd_register_event(int fd, void (*handler)(uint32_t), EventWakeup wakeup) {
92 struct epoll_event ev;
93
94 ev.events = EPOLLIN;
95
96 if (wakeup == EVENT_WAKEUP_FD)
97 ev.events |= EPOLLWAKEUP;
98
99 ev.data.ptr = (void *)handler;
100 if (epoll_ctl(epollfd, EPOLL_CTL_ADD, fd, &ev) == -1) {
101 KLOG_ERROR(LOG_TAG,
102 "epoll_ctl failed; errno=%d\n", errno);
103 return -1;
104 }
105
106 eventct++;
107 return 0;
108 }
109
wakealarm_set_interval(int interval)110 static void wakealarm_set_interval(int interval) {
111 struct itimerspec itval;
112
113 if (wakealarm_fd == -1)
114 return;
115
116 wakealarm_wake_interval = interval;
117
118 if (interval == -1)
119 interval = 0;
120
121 itval.it_interval.tv_sec = interval;
122 itval.it_interval.tv_nsec = 0;
123 itval.it_value.tv_sec = interval;
124 itval.it_value.tv_nsec = 0;
125
126 if (timerfd_settime(wakealarm_fd, 0, &itval, NULL) == -1)
127 KLOG_ERROR(LOG_TAG, "wakealarm_set_interval: timerfd_settime failed\n");
128 }
129
healthd_get_property(int id,struct BatteryProperty * val)130 status_t healthd_get_property(int id, struct BatteryProperty *val) {
131 return gBatteryMonitor->getProperty(id, val);
132 }
133
healthd_battery_update(void)134 void healthd_battery_update(void) {
135 // Fast wake interval when on charger (watch for overheat);
136 // slow wake interval when on battery (watch for drained battery).
137
138 int new_wake_interval = gBatteryMonitor->update() ?
139 healthd_config.periodic_chores_interval_fast :
140 healthd_config.periodic_chores_interval_slow;
141
142 if (new_wake_interval != wakealarm_wake_interval)
143 wakealarm_set_interval(new_wake_interval);
144
145 // During awake periods poll at fast rate. If wake alarm is set at fast
146 // rate then just use the alarm; if wake alarm is set at slow rate then
147 // poll at fast rate while awake and let alarm wake up at slow rate when
148 // asleep.
149
150 if (healthd_config.periodic_chores_interval_fast == -1)
151 awake_poll_interval = -1;
152 else
153 awake_poll_interval =
154 new_wake_interval == healthd_config.periodic_chores_interval_fast ?
155 -1 : healthd_config.periodic_chores_interval_fast * 1000;
156 }
157
healthd_dump_battery_state(int fd)158 void healthd_dump_battery_state(int fd) {
159 gBatteryMonitor->dumpState(fd);
160 fsync(fd);
161 }
162
periodic_chores()163 static void periodic_chores() {
164 healthd_battery_update();
165 }
166
167 #define UEVENT_MSG_LEN 2048
uevent_event(uint32_t)168 static void uevent_event(uint32_t /*epevents*/) {
169 char msg[UEVENT_MSG_LEN+2];
170 char *cp;
171 int n;
172
173 n = uevent_kernel_multicast_recv(uevent_fd, msg, UEVENT_MSG_LEN);
174 if (n <= 0)
175 return;
176 if (n >= UEVENT_MSG_LEN) /* overflow -- discard */
177 return;
178
179 msg[n] = '\0';
180 msg[n+1] = '\0';
181 cp = msg;
182
183 while (*cp) {
184 if (!strcmp(cp, "SUBSYSTEM=" POWER_SUPPLY_SUBSYSTEM)) {
185 healthd_battery_update();
186 break;
187 }
188
189 /* advance to after the next \0 */
190 while (*cp++)
191 ;
192 }
193 }
194
uevent_init(void)195 static void uevent_init(void) {
196 uevent_fd = uevent_open_socket(64*1024, true);
197
198 if (uevent_fd < 0) {
199 KLOG_ERROR(LOG_TAG, "uevent_init: uevent_open_socket failed\n");
200 return;
201 }
202
203 fcntl(uevent_fd, F_SETFL, O_NONBLOCK);
204 if (healthd_register_event(uevent_fd, uevent_event, EVENT_WAKEUP_FD))
205 KLOG_ERROR(LOG_TAG,
206 "register for uevent events failed\n");
207 }
208
wakealarm_event(uint32_t)209 static void wakealarm_event(uint32_t /*epevents*/) {
210 unsigned long long wakeups;
211
212 if (read(wakealarm_fd, &wakeups, sizeof(wakeups)) == -1) {
213 KLOG_ERROR(LOG_TAG, "wakealarm_event: read wakealarm fd failed\n");
214 return;
215 }
216
217 periodic_chores();
218 }
219
wakealarm_init(void)220 static void wakealarm_init(void) {
221 wakealarm_fd = timerfd_create(CLOCK_BOOTTIME_ALARM, TFD_NONBLOCK);
222 if (wakealarm_fd == -1) {
223 KLOG_ERROR(LOG_TAG, "wakealarm_init: timerfd_create failed\n");
224 return;
225 }
226
227 if (healthd_register_event(wakealarm_fd, wakealarm_event, EVENT_WAKEUP_FD))
228 KLOG_ERROR(LOG_TAG,
229 "Registration of wakealarm event failed\n");
230
231 wakealarm_set_interval(healthd_config.periodic_chores_interval_fast);
232 }
233
healthd_mainloop(void)234 static void healthd_mainloop(void) {
235 int nevents = 0;
236 while (1) {
237 struct epoll_event events[eventct];
238 int timeout = awake_poll_interval;
239 int mode_timeout;
240
241 /* Don't wait for first timer timeout to run periodic chores */
242 if (!nevents)
243 periodic_chores();
244
245 healthd_mode_ops->heartbeat();
246
247 mode_timeout = healthd_mode_ops->preparetowait();
248 if (timeout < 0 || (mode_timeout > 0 && mode_timeout < timeout))
249 timeout = mode_timeout;
250 nevents = epoll_wait(epollfd, events, eventct, timeout);
251 if (nevents == -1) {
252 if (errno == EINTR)
253 continue;
254 KLOG_ERROR(LOG_TAG, "healthd_mainloop: epoll_wait failed\n");
255 break;
256 }
257
258 for (int n = 0; n < nevents; ++n) {
259 if (events[n].data.ptr)
260 (*(void (*)(int))events[n].data.ptr)(events[n].events);
261 }
262 }
263
264 return;
265 }
266
healthd_init()267 static int healthd_init() {
268 epollfd = epoll_create(MAX_EPOLL_EVENTS);
269 if (epollfd == -1) {
270 KLOG_ERROR(LOG_TAG,
271 "epoll_create failed; errno=%d\n",
272 errno);
273 return -1;
274 }
275
276 healthd_board_init(&healthd_config);
277 healthd_mode_ops->init(&healthd_config);
278 wakealarm_init();
279 uevent_init();
280 gBatteryMonitor = new BatteryMonitor();
281 gBatteryMonitor->init(&healthd_config);
282 return 0;
283 }
284
healthd_main()285 int healthd_main() {
286 int ret;
287
288 klog_set_level(KLOG_LEVEL);
289
290 if (!healthd_mode_ops) {
291 KLOG_ERROR("healthd ops not set, exiting\n");
292 exit(1);
293 }
294
295 ret = healthd_init();
296 if (ret) {
297 KLOG_ERROR("Initialization failed, exiting\n");
298 exit(2);
299 }
300
301 healthd_mainloop();
302 KLOG_ERROR("Main loop terminated, exiting\n");
303 return 3;
304 }
305