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      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), EventWakeup wakeup) {
    140     struct epoll_event ev;
    141 
    142     ev.events = EPOLLIN;
    143 
    144     if (wakeup == EVENT_WAKEUP_FD)
    145         ev.events |= EPOLLWAKEUP;
    146 
    147     ev.data.ptr = (void *)handler;
    148     if (epoll_ctl(epollfd, EPOLL_CTL_ADD, fd, &ev) == -1) {
    149         KLOG_ERROR(LOG_TAG,
    150                    "epoll_ctl failed; errno=%d\n", errno);
    151         return -1;
    152     }
    153 
    154     eventct++;
    155     return 0;
    156 }
    157 
    158 static void wakealarm_set_interval(int interval) {
    159     struct itimerspec itval;
    160 
    161     if (wakealarm_fd == -1)
    162             return;
    163 
    164     wakealarm_wake_interval = interval;
    165 
    166     if (interval == -1)
    167         interval = 0;
    168 
    169     itval.it_interval.tv_sec = interval;
    170     itval.it_interval.tv_nsec = 0;
    171     itval.it_value.tv_sec = interval;
    172     itval.it_value.tv_nsec = 0;
    173 
    174     if (timerfd_settime(wakealarm_fd, 0, &itval, NULL) == -1)
    175         KLOG_ERROR(LOG_TAG, "wakealarm_set_interval: timerfd_settime failed\n");
    176 }
    177 
    178 status_t healthd_get_property(int id, struct BatteryProperty *val) {
    179     return gBatteryMonitor->getProperty(id, val);
    180 }
    181 
    182 void healthd_battery_update(void) {
    183     // Fast wake interval when on charger (watch for overheat);
    184     // slow wake interval when on battery (watch for drained battery).
    185 
    186    int new_wake_interval = gBatteryMonitor->update() ?
    187        healthd_config.periodic_chores_interval_fast :
    188            healthd_config.periodic_chores_interval_slow;
    189 
    190     if (new_wake_interval != wakealarm_wake_interval)
    191             wakealarm_set_interval(new_wake_interval);
    192 
    193     // During awake periods poll at fast rate.  If wake alarm is set at fast
    194     // rate then just use the alarm; if wake alarm is set at slow rate then
    195     // poll at fast rate while awake and let alarm wake up at slow rate when
    196     // asleep.
    197 
    198     if (healthd_config.periodic_chores_interval_fast == -1)
    199         awake_poll_interval = -1;
    200     else
    201         awake_poll_interval =
    202             new_wake_interval == healthd_config.periodic_chores_interval_fast ?
    203                 -1 : healthd_config.periodic_chores_interval_fast * 1000;
    204 }
    205 
    206 void healthd_dump_battery_state(int fd) {
    207     gBatteryMonitor->dumpState(fd);
    208     fsync(fd);
    209 }
    210 
    211 static void periodic_chores() {
    212     healthd_battery_update();
    213 }
    214 
    215 #define UEVENT_MSG_LEN 2048
    216 static void uevent_event(uint32_t /*epevents*/) {
    217     char msg[UEVENT_MSG_LEN+2];
    218     char *cp;
    219     int n;
    220 
    221     n = uevent_kernel_multicast_recv(uevent_fd, msg, UEVENT_MSG_LEN);
    222     if (n <= 0)
    223         return;
    224     if (n >= UEVENT_MSG_LEN)   /* overflow -- discard */
    225         return;
    226 
    227     msg[n] = '\0';
    228     msg[n+1] = '\0';
    229     cp = msg;
    230 
    231     while (*cp) {
    232         if (!strcmp(cp, "SUBSYSTEM=" POWER_SUPPLY_SUBSYSTEM)) {
    233             healthd_battery_update();
    234             break;
    235         }
    236 
    237         /* advance to after the next \0 */
    238         while (*cp++)
    239             ;
    240     }
    241 }
    242 
    243 static void uevent_init(void) {
    244     uevent_fd = uevent_open_socket(64*1024, true);
    245 
    246     if (uevent_fd < 0) {
    247         KLOG_ERROR(LOG_TAG, "uevent_init: uevent_open_socket failed\n");
    248         return;
    249     }
    250 
    251     fcntl(uevent_fd, F_SETFL, O_NONBLOCK);
    252     if (healthd_register_event(uevent_fd, uevent_event, EVENT_WAKEUP_FD))
    253         KLOG_ERROR(LOG_TAG,
    254                    "register for uevent events failed\n");
    255 }
    256 
    257 static void wakealarm_event(uint32_t /*epevents*/) {
    258     unsigned long long wakeups;
    259 
    260     if (read(wakealarm_fd, &wakeups, sizeof(wakeups)) == -1) {
    261         KLOG_ERROR(LOG_TAG, "wakealarm_event: read wakealarm fd failed\n");
    262         return;
    263     }
    264 
    265     periodic_chores();
    266 }
    267 
    268 static void wakealarm_init(void) {
    269     wakealarm_fd = timerfd_create(CLOCK_BOOTTIME_ALARM, TFD_NONBLOCK);
    270     if (wakealarm_fd == -1) {
    271         KLOG_ERROR(LOG_TAG, "wakealarm_init: timerfd_create failed\n");
    272         return;
    273     }
    274 
    275     if (healthd_register_event(wakealarm_fd, wakealarm_event, EVENT_WAKEUP_FD))
    276         KLOG_ERROR(LOG_TAG,
    277                    "Registration of wakealarm event failed\n");
    278 
    279     wakealarm_set_interval(healthd_config.periodic_chores_interval_fast);
    280 }
    281 
    282 static void healthd_mainloop(void) {
    283     while (1) {
    284         struct epoll_event events[eventct];
    285         int nevents;
    286         int timeout = awake_poll_interval;
    287         int mode_timeout;
    288 
    289         mode_timeout = healthd_mode_ops->preparetowait();
    290         if (timeout < 0 || (mode_timeout > 0 && mode_timeout < timeout))
    291             timeout = mode_timeout;
    292         nevents = epoll_wait(epollfd, events, eventct, timeout);
    293         if (nevents == -1) {
    294             if (errno == EINTR)
    295                 continue;
    296             KLOG_ERROR(LOG_TAG, "healthd_mainloop: epoll_wait failed\n");
    297             break;
    298         }
    299 
    300         for (int n = 0; n < nevents; ++n) {
    301             if (events[n].data.ptr)
    302                 (*(void (*)(int))events[n].data.ptr)(events[n].events);
    303         }
    304 
    305         if (!nevents)
    306             periodic_chores();
    307 
    308         healthd_mode_ops->heartbeat();
    309     }
    310 
    311     return;
    312 }
    313 
    314 static int healthd_init() {
    315     epollfd = epoll_create(MAX_EPOLL_EVENTS);
    316     if (epollfd == -1) {
    317         KLOG_ERROR(LOG_TAG,
    318                    "epoll_create failed; errno=%d\n",
    319                    errno);
    320         return -1;
    321     }
    322 
    323     healthd_board_init(&healthd_config);
    324     healthd_mode_ops->init(&healthd_config);
    325     wakealarm_init();
    326     uevent_init();
    327     gBatteryMonitor = new BatteryMonitor();
    328     gBatteryMonitor->init(&healthd_config);
    329     return 0;
    330 }
    331 
    332 int main(int argc, char **argv) {
    333     int ch;
    334     int ret;
    335 
    336     klog_set_level(KLOG_LEVEL);
    337     healthd_mode_ops = &android_ops;
    338 
    339     if (!strcmp(basename(argv[0]), "charger")) {
    340         healthd_mode_ops = &charger_ops;
    341     } else {
    342         while ((ch = getopt(argc, argv, "cr")) != -1) {
    343             switch (ch) {
    344             case 'c':
    345                 healthd_mode_ops = &charger_ops;
    346                 break;
    347             case 'r':
    348                 healthd_mode_ops = &recovery_ops;
    349                 break;
    350             case '?':
    351             default:
    352                 KLOG_ERROR(LOG_TAG, "Unrecognized healthd option: %c\n",
    353                            optopt);
    354                 exit(1);
    355             }
    356         }
    357     }
    358 
    359     ret = healthd_init();
    360     if (ret) {
    361         KLOG_ERROR("Initialization failed, exiting\n");
    362         exit(2);
    363     }
    364 
    365     healthd_mainloop();
    366     KLOG_ERROR("Main loop terminated, exiting\n");
    367     return 3;
    368 }
    369