Add support for external dock batteries

Allows the external battery status to be read via framework.

Change-Id: I1340071cecab8f1733e58e4f3ba0d304f861f311

2 files changed, 76 insertions, 0 deletions

diff --git a/services/jni/Android.mk b/services/jni/Android.mk
index c3b6539..70413d8 100644
--- a/services/jni/Android.mk
+++ b/services/jni/Android.mk
@@ -56,6 +56,10 @@ ifeq ($(WITH_MALLOC_LEAK_CHECK),true)
     LOCAL_CFLAGS += -DMALLOC_LEAK_CHECK
 endif
 
+ifeq ($(TARGET_HAS_DOCK_BATTERY),true)
+    LOCAL_CFLAGS += -DHAS_DOCK_BATTERY
+endif
+
 LOCAL_MODULE:= libandroid_servers
 
 include $(BUILD_SHARED_LIBRARY)
diff --git a/services/jni/com_android_server_BatteryService.cpp b/services/jni/com_android_server_BatteryService.cpp
index e6133af..f41b25d 100644
--- a/services/jni/com_android_server_BatteryService.cpp
+++ b/services/jni/com_android_server_BatteryService.cpp
@@ -50,6 +50,11 @@ struct FieldIds {
     jfieldID mBatteryVoltage;
     jfieldID mBatteryTemperature;
     jfieldID mBatteryTechnology;
+#ifdef HAS_DOCK_BATTERY
+    jfieldID mDockBatteryStatus;
+    jfieldID mDockBatteryLevel;
+    jfieldID mDockBatteryPresent;
+#endif
 };
 static FieldIds gFieldIds;
 
@@ -66,6 +71,11 @@ struct BatteryManagerConstants {
     jint healthOverVoltage;
     jint healthUnspecifiedFailure;
     jint healthCold;
+#ifdef HAS_DOCK_BATTERY
+    jint dockstatusCharging;
+    jint dockstatusNotCharging;
+    jint dockstatusUndocked;
+#endif
 };
 static BatteryManagerConstants gConstants;
 
@@ -80,6 +90,11 @@ struct PowerSupplyPaths {
     char* batteryVoltagePath;
     char* batteryTemperaturePath;
     char* batteryTechnologyPath;
+#ifdef HAS_DOCK_BATTERY
+    char* dockbatteryStatusPath;
+    char* dockbatteryCapacityPath;
+    char* dockbatteryPresentPath;
+#endif
 };
 static PowerSupplyPaths gPaths;
 
@@ -101,6 +116,21 @@ static jint getBatteryStatus(const char* status)
     }
 }
 
+#ifdef HAS_DOCK_BATTERY
+static jint getDockBatteryStatus(const char* status)
+{
+    switch (status[0]) {
+        case 'C': return gConstants.dockstatusCharging;         // Charging
+        case 'N': return gConstants.dockstatusNotCharging;      // Not charging
+
+        default: {
+            ALOGW("Unknown dock battery status '%s'", status);
+            return gConstants.dockstatusUndocked;
+        }
+    }
+}
+#endif
+
 static jint getBatteryHealth(const char* status)
 {
     switch (status[0]) {
@@ -202,6 +232,10 @@ static void android_server_BatteryService_update(JNIEnv* env, jobject obj)
     setBooleanField(env, obj, gPaths.usbOnlinePath, gFieldIds.mUsbOnline);
     setBooleanField(env, obj, gPaths.wirelessOnlinePath, gFieldIds.mWirelessOnline);
     setBooleanField(env, obj, gPaths.batteryPresentPath, gFieldIds.mBatteryPresent);
+
+#ifdef HAS_DOCK_BATTERY
+    setIntField(env, obj, gPaths.dockbatteryCapacityPath, gFieldIds.mDockBatteryLevel);
+#endif
     
     setIntField(env, obj, gPaths.batteryCapacityPath, gFieldIds.mBatteryLevel);
     setVoltageField(env, obj, gPaths.batteryVoltagePath, gFieldIds.mBatteryVoltage);
@@ -215,6 +249,14 @@ static void android_server_BatteryService_update(JNIEnv* env, jobject obj)
     else
         env->SetIntField(obj, gFieldIds.mBatteryStatus,
                          gConstants.statusUnknown);
+
+#ifdef HAS_DOCK_BATTERY
+    if (readFromFile(gPaths.dockbatteryStatusPath, buf, SIZE) > 0)
+        env->SetIntField(obj, gFieldIds.mDockBatteryStatus, getDockBatteryStatus(buf));
+    else
+        env->SetIntField(obj, gFieldIds.mDockBatteryStatus,
+                         gConstants.dockstatusUndocked);
+#endif
     
     if (readFromFile(gPaths.batteryHealthPath, buf, SIZE) > 0)
         env->SetIntField(obj, gFieldIds.mBatteryHealth, getBatteryHealth(buf));
@@ -306,6 +348,19 @@ int register_android_server_BatteryService(JNIEnv* env)
                     if (access(path, R_OK) == 0)
                         gPaths.batteryTechnologyPath = strdup(path);
                 }
+#ifdef HAS_DOCK_BATTERY
+                else if(strcmp(buf, "DockBattery") == 0) {
+                    snprintf(path, sizeof(path), "%s/%s/status", POWER_SUPPLY_PATH, name);
+                    if (access(path, R_OK) == 0)
+                        gPaths.dockbatteryStatusPath = strdup(path);
+                    snprintf(path, sizeof(path), "%s/%s/capacity", POWER_SUPPLY_PATH, name);
+                    if (access(path, R_OK) == 0)
+                        gPaths.dockbatteryCapacityPath = strdup(path);
+                    snprintf(path, sizeof(path), "%s/%s/device/ec_dock", POWER_SUPPLY_PATH, name);
+                    if (access(path, R_OK) == 0)
+                        gPaths.dockbatteryPresentPath = strdup(path);
+                }
+#endif
             }
         }
         closedir(dir);
@@ -350,6 +405,12 @@ int register_android_server_BatteryService(JNIEnv* env)
     gFieldIds.mBatteryVoltage = env->GetFieldID(clazz, "mBatteryVoltage", "I");
     gFieldIds.mBatteryTemperature = env->GetFieldID(clazz, "mBatteryTemperature", "I");
 
+#ifdef HAS_DOCK_BATTERY
+    gFieldIds.mDockBatteryStatus = env->GetFieldID(clazz, "mDockBatteryStatus", "I");
+    gFieldIds.mDockBatteryLevel = env->GetFieldID(clazz, "mDockBatteryLevel", "I");
+    gFieldIds.mDockBatteryPresent = env->GetFieldID(clazz, "mDockBatteryPresent", "Ljava/lang/String;");
+#endif
+
     LOG_FATAL_IF(gFieldIds.mAcOnline == NULL, "Unable to find BatteryService.AC_ONLINE_PATH");
     LOG_FATAL_IF(gFieldIds.mUsbOnline == NULL, "Unable to find BatteryService.USB_ONLINE_PATH");
     LOG_FATAL_IF(gFieldIds.mWirelessOnline == NULL, "Unable to find BatteryService.WIRELESS_ONLINE_PATH");
@@ -404,6 +465,17 @@ int register_android_server_BatteryService(JNIEnv* env)
     gConstants.healthCold = env->GetStaticIntField(clazz,
             env->GetStaticFieldID(clazz, "BATTERY_HEALTH_COLD", "I"));
 
+#ifdef HAS_DOCK_BATTERY
+    gConstants.dockstatusCharging = env->GetStaticIntField(clazz,
+            env->GetStaticFieldID(clazz, "DOCK_STATE_CHARGING", "I"));
+
+    gConstants.dockstatusNotCharging = env->GetStaticIntField(clazz,
+            env->GetStaticFieldID(clazz, "DOCK_STATE_DISCHARGING", "I"));
+
+    gConstants.dockstatusUndocked = env->GetStaticIntField(clazz,
+            env->GetStaticFieldID(clazz, "DOCK_STATE_UNDOCKED", "I"));
+#endif
+
     return jniRegisterNativeMethods(env, "com/android/server/BatteryService", sMethods, NELEM(sMethods));
 }