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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.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 
    122 static void healthd_mode_nop_init(struct healthd_config* /*config*/) {
    123 }
    124 
    125 static int healthd_mode_nop_preparetowait(void) {
    126     return -1;
    127 }
    128 
    129 static void healthd_mode_nop_heartbeat(void) {
    130 }
    131 
    132 static void healthd_mode_nop_battery_update(
    133     struct android::BatteryProperties* /*props*/) {
    134 }
    135 
    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 
    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 
    171 status_t healthd_get_property(int id, struct BatteryProperty *val) {
    172     return gBatteryMonitor->getProperty(id, val);
    173 }
    174 
    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 
    199 void healthd_dump_battery_state(int fd) {
    200     gBatteryMonitor->dumpState(fd);
    201     fsync(fd);
    202 }
    203 
    204 static void periodic_chores() {
    205     healthd_battery_update();
    206 }
    207 
    208 #define UEVENT_MSG_LEN 2048
    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 
    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 
    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 
    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 
    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 
    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 
    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