commit 42a981ddee525c55cef40d5da987d0e3d5fa4b4c
author Ruchi Kandoi <kandoiruchi@google.com> Mon Sep 28 13:35:59 2015 -0700
committer Ruchi Kandoi <kandoiruchi@google.com> Mon Oct 12 14:31:58 2015 -0700
tree a6dadac914b59c155c940317ac60af3943ece4a0
parent 805ef688af4035ac45e79428a1b6328bd0b465d2

healthd: Adds fake battery properties for devices with no battery.

Devices which have no battery and are always plugged in will not have
any battery property initialized. This causes the 'stable power' to
never be switched which is required for updating apps.

This change recognizes such a device and manually sets the battery to
100% and charger status to connected to AC mains. It will also fake the
battery temperature.

Bug: 24258855
Change-Id: I98e5ed0dbeb7f2ab6d3802cd7e0f3a269bd8f31f
Signed-off-by: Ruchi Kandoi <kandoiruchi@google.com>

healthd/BatteryMonitor.cpp

diff --git a/healthd/BatteryMonitor.cpp b/healthd/BatteryMonitor.cpp
index 1cad427..396dfef 100644
--- a/healthd/BatteryMonitor.cpp
+++ b/healthd/BatteryMonitor.cpp
@@ -39,6 +39,7 @@
 #define POWER_SUPPLY_SYSFS_PATH "/sys/class/" POWER_SUPPLY_SUBSYSTEM
 #define FAKE_BATTERY_CAPACITY 42
 #define FAKE_BATTERY_TEMPERATURE 424
+#define ALWAYS_PLUGGED_CAPACITY 100
 
 namespace android {
 
@@ -199,6 +200,15 @@
         mBatteryFixedTemperature :
         getIntField(mHealthdConfig->batteryTemperaturePath);
 
+    // For devices which do not have battery and are always plugged
+    // into power souce.
+    if (mAlwaysPluggedDevice) {
+        props.chargerAcOnline = true;
+        props.batteryPresent = true;
+        props.batteryStatus = BATTERY_STATUS_CHARGING;
+        props.batteryHealth = BATTERY_HEALTH_GOOD;
+    }
+
     const int SIZE = 128;
     char buf[SIZE];
     String8 btech;
@@ -542,8 +552,15 @@
         closedir(dir);
     }
 
-    if (!mChargerNames.size())
+    // This indicates that there is no charger driver registered.
+    // Typically the case for devices which do not have a battery and
+    // and are always plugged into AC mains.
+    if (!mChargerNames.size()) {
         KLOG_ERROR(LOG_TAG, "No charger supplies found\n");
+        mBatteryFixedCapacity = ALWAYS_PLUGGED_CAPACITY;
+        mBatteryFixedTemperature = FAKE_BATTERY_TEMPERATURE;
+        mAlwaysPluggedDevice = true;
+    }
     if (!mBatteryDevicePresent) {
         KLOG_WARNING(LOG_TAG, "No battery devices found\n");
         hc->periodic_chores_interval_fast = -1;

healthd/BatteryMonitor.h

diff --git a/healthd/BatteryMonitor.h b/healthd/BatteryMonitor.h
index 3425f27..a61171f 100644
--- a/healthd/BatteryMonitor.h
+++ b/healthd/BatteryMonitor.h
@@ -46,6 +46,7 @@
     struct healthd_config *mHealthdConfig;
     Vector<String8> mChargerNames;
     bool mBatteryDevicePresent;
+    bool mAlwaysPluggedDevice;
     int mBatteryFixedCapacity;
     int mBatteryFixedTemperature;
     struct BatteryProperties props;