Home | History | Annotate | Download | only in healthd 
      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 
    125 static void healthd_mode_nop_init(struct healthd_config* /*config*/) {
    126 }
    127 
    128 static int healthd_mode_nop_preparetowait(void) {
    129     return -1;
    130 }
    131 
    132 static void healthd_mode_nop_heartbeat(void) {
    133 }
    134 
    135 static void healthd_mode_nop_battery_update(
    136     struct android::BatteryProperties* /*props*/) {
    137 }
    138 
    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 
    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 
    174 status_t healthd_get_property(int id, struct BatteryProperty *val) {
    175     return gBatteryMonitor->getProperty(id, val);
    176 }
    177 
    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 
    202 void healthd_dump_battery_state(int fd) {
    203     gBatteryMonitor->dumpState(fd);
    204     fsync(fd);
    205 }
    206 
    207 static void periodic_chores() {
    208     healthd_battery_update();
    209 }
    210 
    211 #define UEVENT_MSG_LEN 2048
    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 
    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 
    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 
    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 
    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 
    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 
    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