Home | History | Annotate | Download | only in health 
      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-manta"
     18 #include <errno.h>
     19 #include <fcntl.h>
     20 #include <healthd.h>
     21 #include <time.h>
     22 #include <unistd.h>
     23 #include <batteryservice/BatteryService.h>
     24 #include <cutils/klog.h>
     25 #include <sys/stat.h>
     26 #include <sys/types.h>
     27 
     28 #define POWER_SUPPLY_SUBSYSTEM "power_supply"
     29 #define POWER_SUPPLY_SYSFS_PATH "/sys/class/" POWER_SUPPLY_SUBSYSTEM
     30 
     31 #define DS2784_PATH POWER_SUPPLY_SYSFS_PATH "/ds2784-fuelgauge"
     32 
     33 using namespace android;
     34 
     35 #define TEMP_HIGH_THRESHOLD     600     /* 60C */
     36 #define TEMP_HIGH_RECOVERY      420     /* 42C */
     37 #define TEMP_LOW_RECOVERY       0       /*  0C */
     38 #define TEMP_LOW_THRESHOLD      -50     /* -5C */
     39 
     40 #define FULL_CHARGING_TIME      (12 * 60 * 60)
     41 #define RECHARGING_TIME         (2 * 60 * 60)
     42 #define RECHARGING_VOLTAGE      (4250)
     43 
     44 static bool manta_bat_recharging;
     45 static time_t manta_bat_charging_start_time;
     46 
     47 static unsigned int manta_bat_health = BATTERY_HEALTH_GOOD;
     48 static unsigned int manta_bat_charging_status = BATTERY_STATUS_DISCHARGING;
     49 static bool manta_bat_batterypresent;
     50 
     51 static int charge_enabled_fd;
     52 
     53 static void manta_bat_check_temp(struct BatteryProperties *props)
     54 {
     55     if (props->chargerAcOnline == false &&
     56         props->chargerUsbOnline == false)
     57         return;
     58 
     59     if (props->batteryTemperature >= TEMP_HIGH_THRESHOLD) {
     60         if (manta_bat_health != BATTERY_HEALTH_OVERHEAT &&
     61             manta_bat_health != BATTERY_HEALTH_UNSPECIFIED_FAILURE) {
     62                 KLOG_INFO(LOG_TAG,
     63                           "battery overheat (%d), charging unavailable\n",
     64                           props->batteryTemperature);
     65                 manta_bat_health = BATTERY_HEALTH_OVERHEAT;
     66         }
     67     } else if (props->batteryTemperature <= TEMP_HIGH_RECOVERY &&
     68                props->batteryTemperature >= TEMP_LOW_RECOVERY) {
     69         if (manta_bat_health == BATTERY_HEALTH_OVERHEAT ||
     70             manta_bat_health == BATTERY_HEALTH_COLD) {
     71             KLOG_INFO(LOG_TAG,
     72                       "battery recovery (%d), charging available\n",
     73                       props->batteryTemperature);
     74             manta_bat_health = BATTERY_HEALTH_GOOD;
     75         }
     76     } else if (props->batteryTemperature <= TEMP_LOW_THRESHOLD) {
     77         if (manta_bat_health != BATTERY_HEALTH_COLD &&
     78             manta_bat_health != BATTERY_HEALTH_UNSPECIFIED_FAILURE) {
     79             KLOG_INFO(LOG_TAG,
     80                       "battery cold (%d), charging unavailable\n",
     81                       props->batteryTemperature);
     82             manta_bat_health = BATTERY_HEALTH_COLD;
     83         }
     84     }
     85 }
     86 
     87 static void manta_bat_set_charge_time(bool enable)
     88 {
     89     if (enable && !manta_bat_charging_start_time)
     90         time(&manta_bat_charging_start_time);
     91     else if (!enable)
     92         manta_bat_charging_start_time = 0;
     93 }
     94 
     95 static void manta_bat_enable_charging(bool enable)
     96 {
     97     int ret;
     98     char val[20];
     99 
    100     if (enable && (manta_bat_health != BATTERY_HEALTH_GOOD)) {
    101         manta_bat_charging_status = BATTERY_STATUS_NOT_CHARGING;
    102         return;
    103     }
    104 
    105     if (charge_enabled_fd < 0)
    106         goto err;
    107 
    108     snprintf(val, sizeof(val), "%d", enable);
    109     ret = write(charge_enabled_fd, val, strlen(val));
    110     if (ret == -1) {
    111         KLOG_ERROR(LOG_TAG, "charge_enabled write error; errno=%d\n", errno);
    112         goto err;
    113     }
    114 
    115     manta_bat_set_charge_time(enable);
    116     KLOG_INFO(LOG_TAG, "battery charge enable=%d\n", enable);
    117     return;
    118 
    119 err:
    120     if (enable)
    121         manta_bat_charging_status = BATTERY_STATUS_NOT_CHARGING;
    122 }
    123 
    124 static bool manta_bat_charge_timeout(time_t timeout)
    125 {
    126     if (!manta_bat_charging_start_time)
    127         return false;
    128 
    129     return time(NULL) >= manta_bat_charging_start_time + timeout;
    130 }
    131 
    132 static void manta_bat_set_full(void)
    133 {
    134     KLOG_INFO(LOG_TAG, "battery full\n");
    135     manta_bat_charging_status = BATTERY_STATUS_FULL;
    136     manta_bat_enable_charging(false);
    137     manta_bat_recharging = false;
    138 }
    139 
    140 static void manta_bat_charging_timer(struct BatteryProperties *props)
    141 {
    142     if (!manta_bat_charging_start_time &&
    143         manta_bat_charging_status == BATTERY_STATUS_CHARGING) {
    144         KLOG_WARNING("battery charging timer not started, starting\n");
    145         manta_bat_enable_charging(true);
    146         manta_bat_recharging = true;
    147     } else if (!manta_bat_charging_start_time) {
    148         return;
    149     }
    150 
    151     if (manta_bat_charge_timeout(manta_bat_recharging ?
    152                                  RECHARGING_TIME : FULL_CHARGING_TIME)) {
    153         KLOG_INFO(LOG_TAG, "battery charging timer expired\n");
    154         if (props->batteryVoltage > RECHARGING_VOLTAGE &&
    155             props->batteryLevel == 100) {
    156             manta_bat_set_full();
    157         } else {
    158             manta_bat_enable_charging(false);
    159             manta_bat_recharging = false;
    160             manta_bat_charging_start_time = 0;
    161         }
    162     }
    163 }
    164 
    165 static void manta_bat_check_charge_source_changed(
    166     struct BatteryProperties *props)
    167 {
    168     if (props->chargerUsbOnline || props->chargerAcOnline) {
    169         if (manta_bat_charging_status == BATTERY_STATUS_CHARGING ||
    170             (manta_bat_charging_status == BATTERY_STATUS_FULL &&
    171              manta_bat_recharging))
    172             return;
    173 
    174         /*
    175          * If charging status indicates a charger was already
    176          * connected prior to this and the status is something
    177          * other than charging ("full" or "not-charging"), leave
    178          * the status alone.
    179          */
    180         if (manta_bat_charging_status == BATTERY_STATUS_DISCHARGING ||
    181             manta_bat_charging_status == BATTERY_STATUS_UNKNOWN)
    182             manta_bat_charging_status = BATTERY_STATUS_CHARGING;
    183 
    184         /*
    185          * Don't re-enable charging if the battery is full and we
    186          * are not actively re-charging it, or if "not-charging"
    187          * status is set.
    188          */
    189         if (!(manta_bat_charging_status == BATTERY_STATUS_FULL
    190               && !manta_bat_recharging) &&
    191             manta_bat_charging_status != BATTERY_STATUS_NOT_CHARGING)
    192             manta_bat_enable_charging(true);
    193     } else if (manta_bat_charging_status == BATTERY_STATUS_CHARGING ||
    194                manta_bat_charging_status == BATTERY_STATUS_NOT_CHARGING ||
    195                manta_bat_charging_status == BATTERY_STATUS_FULL) {
    196         manta_bat_charging_status = BATTERY_STATUS_DISCHARGING;
    197         manta_bat_enable_charging(false);
    198         manta_bat_health = BATTERY_HEALTH_GOOD;
    199         manta_bat_recharging = false;
    200         manta_bat_charging_start_time = 0;
    201     }
    202 }
    203 
    204 static void manta_bat_monitor(struct BatteryProperties *props)
    205 {
    206     unsigned int old_bat_health = manta_bat_health;
    207 
    208     if (manta_bat_batterypresent) {
    209         manta_bat_check_temp(props);
    210     } else {
    211          props->batteryTemperature = 42;  /* 4.2C */
    212          props->batteryVoltage = 4242; /* 4242mV */
    213          props->batteryLevel = 42;        /* 42% */
    214          props->batteryCurrentNow = 42000;/* 42mA */
    215     }
    216 
    217     if (props->batteryStatus == BATTERY_STATUS_FULL &&
    218         (manta_bat_charging_status == BATTERY_STATUS_CHARGING ||
    219          manta_bat_recharging)) {
    220             manta_bat_set_full();
    221     }
    222 
    223     manta_bat_check_charge_source_changed(props);
    224 
    225     switch (manta_bat_charging_status) {
    226     case BATTERY_STATUS_FULL:
    227         if (props->batteryVoltage < RECHARGING_VOLTAGE &&
    228             !manta_bat_recharging) {
    229             KLOG_INFO(LOG_TAG, "start recharging, v=%d\n",
    230                       props->batteryVoltage);
    231             manta_bat_recharging = true;
    232             manta_bat_enable_charging(true);
    233         }
    234         break;
    235     case BATTERY_STATUS_DISCHARGING:
    236         break;
    237     case BATTERY_STATUS_CHARGING:
    238         switch (manta_bat_health) {
    239         case BATTERY_HEALTH_OVERHEAT:
    240         case BATTERY_HEALTH_COLD:
    241         case BATTERY_HEALTH_OVER_VOLTAGE:
    242         case BATTERY_HEALTH_DEAD:
    243         case BATTERY_HEALTH_UNSPECIFIED_FAILURE:
    244             manta_bat_charging_status = BATTERY_STATUS_NOT_CHARGING;
    245             manta_bat_enable_charging(false);
    246             KLOG_INFO(LOG_TAG, "Not charging, health=%d\n",
    247                       manta_bat_health);
    248             break;
    249         default:
    250             break;
    251         }
    252         break;
    253     case BATTERY_STATUS_NOT_CHARGING:
    254         if (old_bat_health != BATTERY_HEALTH_GOOD &&
    255             manta_bat_health == BATTERY_HEALTH_GOOD) {
    256                 KLOG_INFO(LOG_TAG, "battery health recovered\n");
    257 
    258                 if (props->chargerUsbOnline || props->chargerAcOnline) {
    259                     manta_bat_enable_charging(true);
    260                     manta_bat_charging_status = BATTERY_STATUS_CHARGING;
    261                 } else {
    262                     manta_bat_charging_status =
    263                             BATTERY_STATUS_DISCHARGING;
    264                 }
    265         }
    266         break;
    267     default:
    268         break;
    269     }
    270 
    271     manta_bat_charging_timer(props);
    272 
    273     // set health and status according to our state, hardcode invariants
    274     props->batteryHealth = manta_bat_health;
    275     props->batteryStatus = manta_bat_charging_status;
    276     props->batteryTechnology = "Li-ion";
    277     props->batteryPresent = manta_bat_batterypresent;
    278 }
    279 
    280 int healthd_board_battery_update(struct BatteryProperties *props)
    281 {
    282     manta_bat_monitor(props);
    283 
    284     // return 0 to log periodic polled battery status to kernel log
    285     return 0;
    286 }
    287 
    288 void healthd_board_init(struct healthd_config *config)
    289 {
    290     charge_enabled_fd = open(POWER_SUPPLY_SYSFS_PATH
    291                              "/manta-battery/charge_enabled", O_WRONLY);
    292     if (charge_enabled_fd == -1)
    293         KLOG_ERROR(LOG_TAG, "open manta-battery/charge_enabled failed"
    294                    "; errno=%d\n", errno);
    295 
    296     config->batteryCurrentNowPath = DS2784_PATH "/current_now";
    297 
    298     if (access(config->batteryCurrentNowPath.string(), R_OK) == 0) {
    299         manta_bat_batterypresent = true;
    300     } else {
    301         KLOG_INFO("Missing battery, using fake battery data\n");
    302         config->batteryCurrentNowPath.clear();
    303     }
    304 }
    305