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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     .boot_min_cap = 0,
     57     .screen_on = NULL,
     58 };
     59 
     60 static int eventct;
     61 static int epollfd;
     62 
     63 #define POWER_SUPPLY_SUBSYSTEM "power_supply"
     64 
     65 // epoll_create() parameter is actually unused
     66 #define MAX_EPOLL_EVENTS 40
     67 static int uevent_fd;
     68 static int wakealarm_fd;
     69 
     70 // -1 for no epoll timeout
     71 static int awake_poll_interval = -1;
     72 
     73 static int wakealarm_wake_interval = DEFAULT_PERIODIC_CHORES_INTERVAL_FAST;
     74 
     75 static BatteryMonitor* gBatteryMonitor;
     76 
     77 struct healthd_mode_ops *healthd_mode_ops;
     78 
     79 // Android mode
     80 
     81 extern void healthd_mode_android_init(struct healthd_config *config);
     82 extern int healthd_mode_android_preparetowait(void);
     83 extern void healthd_mode_android_battery_update(
     84     struct android::BatteryProperties *props);
     85 
     86 // Charger mode
     87 
     88 extern void healthd_mode_charger_init(struct healthd_config *config);
     89 extern int healthd_mode_charger_preparetowait(void);
     90 extern void healthd_mode_charger_heartbeat(void);
     91 extern void healthd_mode_charger_battery_update(
     92     struct android::BatteryProperties *props);
     93 
     94 // NOPs for modes that need no special action
     95 
     96 static void healthd_mode_nop_init(struct healthd_config *config);
     97 static int healthd_mode_nop_preparetowait(void);
     98 static void healthd_mode_nop_heartbeat(void);
     99 static void healthd_mode_nop_battery_update(
    100     struct android::BatteryProperties *props);
    101 
    102 static struct healthd_mode_ops android_ops = {
    103     .init = healthd_mode_android_init,
    104     .preparetowait = healthd_mode_android_preparetowait,
    105     .heartbeat = healthd_mode_nop_heartbeat,
    106     .battery_update = healthd_mode_android_battery_update,
    107 };
    108 
    109 static struct healthd_mode_ops charger_ops = {
    110     .init = healthd_mode_charger_init,
    111     .preparetowait = healthd_mode_charger_preparetowait,
    112     .heartbeat = healthd_mode_charger_heartbeat,
    113     .battery_update = healthd_mode_charger_battery_update,
    114 };
    115 
    116 static struct healthd_mode_ops recovery_ops = {
    117     .init = healthd_mode_nop_init,
    118     .preparetowait = healthd_mode_nop_preparetowait,
    119     .heartbeat = healthd_mode_nop_heartbeat,
    120     .battery_update = healthd_mode_nop_battery_update,
    121 };
    122 
    123 static void healthd_mode_nop_init(struct healthd_config* /*config*/) {
    124 }
    125 
    126 static int healthd_mode_nop_preparetowait(void) {
    127     return -1;
    128 }
    129 
    130 static void healthd_mode_nop_heartbeat(void) {
    131 }
    132 
    133 static void healthd_mode_nop_battery_update(
    134     struct android::BatteryProperties* /*props*/) {
    135 }
    136 
    137 int healthd_register_event(int fd, void (*handler)(uint32_t)) {
    138     struct epoll_event ev;
    139 
    140     ev.events = EPOLLIN | EPOLLWAKEUP;
    141     ev.data.ptr = (void *)handler;
    142     if (epoll_ctl(epollfd, EPOLL_CTL_ADD, fd, &ev) == -1) {
    143         KLOG_ERROR(LOG_TAG,
    144                    "epoll_ctl failed; errno=%d\n", errno);
    145         return -1;
    146     }
    147 
    148     eventct++;
    149     return 0;
    150 }
    151 
    152 static void wakealarm_set_interval(int interval) {
    153     struct itimerspec itval;
    154 
    155     if (wakealarm_fd == -1)
    156             return;
    157 
    158     wakealarm_wake_interval = interval;
    159 
    160     if (interval == -1)
    161         interval = 0;
    162 
    163     itval.it_interval.tv_sec = interval;
    164     itval.it_interval.tv_nsec = 0;
    165     itval.it_value.tv_sec = interval;
    166     itval.it_value.tv_nsec = 0;
    167 
    168     if (timerfd_settime(wakealarm_fd, 0, &itval, NULL) == -1)
    169         KLOG_ERROR(LOG_TAG, "wakealarm_set_interval: timerfd_settime failed\n");
    170 }
    171 
    172 status_t healthd_get_property(int id, struct BatteryProperty *val) {
    173     return gBatteryMonitor->getProperty(id, val);
    174 }
    175 
    176 void healthd_battery_update(void) {
    177     // Fast wake interval when on charger (watch for overheat);
    178     // slow wake interval when on battery (watch for drained battery).
    179 
    180    int new_wake_interval = gBatteryMonitor->update() ?
    181        healthd_config.periodic_chores_interval_fast :
    182            healthd_config.periodic_chores_interval_slow;
    183 
    184     if (new_wake_interval != wakealarm_wake_interval)
    185             wakealarm_set_interval(new_wake_interval);
    186 
    187     // During awake periods poll at fast rate.  If wake alarm is set at fast
    188     // rate then just use the alarm; if wake alarm is set at slow rate then
    189     // poll at fast rate while awake and let alarm wake up at slow rate when
    190     // asleep.
    191 
    192     if (healthd_config.periodic_chores_interval_fast == -1)
    193         awake_poll_interval = -1;
    194     else
    195         awake_poll_interval =
    196             new_wake_interval == healthd_config.periodic_chores_interval_fast ?
    197                 -1 : healthd_config.periodic_chores_interval_fast * 1000;
    198 }
    199 
    200 void healthd_dump_battery_state(int fd) {
    201     gBatteryMonitor->dumpState(fd);
    202     fsync(fd);
    203 }
    204 
    205 static void periodic_chores() {
    206     healthd_battery_update();
    207 }
    208 
    209 #define UEVENT_MSG_LEN 2048
    210 static void uevent_event(uint32_t /*epevents*/) {
    211     char msg[UEVENT_MSG_LEN+2];
    212     char *cp;
    213     int n;
    214 
    215     n = uevent_kernel_multicast_recv(uevent_fd, msg, UEVENT_MSG_LEN);
    216     if (n <= 0)
    217         return;
    218     if (n >= UEVENT_MSG_LEN)   /* overflow -- discard */
    219         return;
    220 
    221     msg[n] = '\0';
    222     msg[n+1] = '\0';
    223     cp = msg;
    224 
    225     while (*cp) {
    226         if (!strcmp(cp, "SUBSYSTEM=" POWER_SUPPLY_SUBSYSTEM)) {
    227             healthd_battery_update();
    228             break;
    229         }
    230 
    231         /* advance to after the next \0 */
    232         while (*cp++)
    233             ;
    234     }
    235 }
    236 
    237 static void uevent_init(void) {
    238     uevent_fd = uevent_open_socket(64*1024, true);
    239 
    240     if (uevent_fd < 0) {
    241         KLOG_ERROR(LOG_TAG, "uevent_init: uevent_open_socket failed\n");
    242         return;
    243     }
    244 
    245     fcntl(uevent_fd, F_SETFL, O_NONBLOCK);
    246     if (healthd_register_event(uevent_fd, uevent_event))
    247         KLOG_ERROR(LOG_TAG,
    248                    "register for uevent events failed\n");
    249 }
    250 
    251 static void wakealarm_event(uint32_t /*epevents*/) {
    252     unsigned long long wakeups;
    253 
    254     if (read(wakealarm_fd, &wakeups, sizeof(wakeups)) == -1) {
    255         KLOG_ERROR(LOG_TAG, "wakealarm_event: read wakealarm fd failed\n");
    256         return;
    257     }
    258 
    259     periodic_chores();
    260 }
    261 
    262 static void wakealarm_init(void) {
    263     wakealarm_fd = timerfd_create(CLOCK_BOOTTIME_ALARM, TFD_NONBLOCK);
    264     if (wakealarm_fd == -1) {
    265         KLOG_ERROR(LOG_TAG, "wakealarm_init: timerfd_create failed\n");
    266         return;
    267     }
    268 
    269     if (healthd_register_event(wakealarm_fd, wakealarm_event))
    270         KLOG_ERROR(LOG_TAG,
    271                    "Registration of wakealarm event failed\n");
    272 
    273     wakealarm_set_interval(healthd_config.periodic_chores_interval_fast);
    274 }
    275 
    276 static void healthd_mainloop(void) {
    277     while (1) {
    278         struct epoll_event events[eventct];
    279         int nevents;
    280         int timeout = awake_poll_interval;
    281         int mode_timeout;
    282 
    283         mode_timeout = healthd_mode_ops->preparetowait();
    284         if (timeout < 0 || (mode_timeout > 0 && mode_timeout < timeout))
    285             timeout = mode_timeout;
    286         nevents = epoll_wait(epollfd, events, eventct, timeout);
    287 
    288         if (nevents == -1) {
    289             if (errno == EINTR)
    290                 continue;
    291             KLOG_ERROR(LOG_TAG, "healthd_mainloop: epoll_wait failed\n");
    292             break;
    293         }
    294 
    295         for (int n = 0; n < nevents; ++n) {
    296             if (events[n].data.ptr)
    297                 (*(void (*)(int))events[n].data.ptr)(events[n].events);
    298         }
    299 
    300         if (!nevents)
    301             periodic_chores();
    302 
    303         healthd_mode_ops->heartbeat();
    304     }
    305 
    306     return;
    307 }
    308 
    309 static int healthd_init() {
    310     epollfd = epoll_create(MAX_EPOLL_EVENTS);
    311     if (epollfd == -1) {
    312         KLOG_ERROR(LOG_TAG,
    313                    "epoll_create failed; errno=%d\n",
    314                    errno);
    315         return -1;
    316     }
    317 
    318     healthd_board_init(&healthd_config);
    319     healthd_mode_ops->init(&healthd_config);
    320     wakealarm_init();
    321     uevent_init();
    322     gBatteryMonitor = new BatteryMonitor();
    323     gBatteryMonitor->init(&healthd_config);
    324     return 0;
    325 }
    326 
    327 int main(int argc, char **argv) {
    328     int ch;
    329     int ret;
    330 
    331     klog_set_level(KLOG_LEVEL);
    332     healthd_mode_ops = &android_ops;
    333 
    334     if (!strcmp(basename(argv[0]), "charger")) {
    335         healthd_mode_ops = &charger_ops;
    336     } else {
    337         while ((ch = getopt(argc, argv, "cr")) != -1) {
    338             switch (ch) {
    339             case 'c':
    340                 healthd_mode_ops = &charger_ops;
    341                 break;
    342             case 'r':
    343                 healthd_mode_ops = &recovery_ops;
    344                 break;
    345             case '?':
    346             default:
    347                 KLOG_ERROR(LOG_TAG, "Unrecognized healthd option: %c\n",
    348                            optopt);
    349                 exit(1);
    350             }
    351         }
    352     }
    353 
    354     ret = healthd_init();
    355     if (ret) {
    356         KLOG_ERROR("Initialization failed, exiting\n");
    357         exit(2);
    358     }
    359 
    360     healthd_mainloop();
    361     KLOG_ERROR("Main loop terminated, exiting\n");
    362     return 3;
    363 }
    364