blob: f689bb46ca31932400eae7902935ee8e9be61347 [file] [log] [blame]
/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "VoldCheckBattery"
#include <cutils/log.h>
#include <binder/IServiceManager.h>
#include <batteryservice/IBatteryPropertiesRegistrar.h>
using namespace android;
namespace
{
// How often to check battery in seconds
const int CHECK_PERIOD = 30;
// How charged should the battery be (percent) to start encrypting
const int START_THRESHOLD = 10;
// How charged should the battery be (percent) to continue encrypting
const int CONTINUE_THRESHOLD = 5;
const String16 serviceName("batteryproperties");
sp<IBinder> bs;
sp<IBatteryPropertiesRegistrar> interface;
bool singletonInitialized = false;
time_t last_checked = {0};
int last_result = 100;
int is_battery_ok(int threshold)
{
time_t now = time(NULL);
if (now == -1 || difftime(now, last_checked) < 5) {
goto finish;
}
last_checked = now;
if (!singletonInitialized) {
bs = defaultServiceManager()->checkService(serviceName);
if (bs == NULL) {
SLOGE("No batteryproperties service!");
goto finish;
}
interface = interface_cast<IBatteryPropertiesRegistrar>(bs);
if (interface == NULL) {
SLOGE("No IBatteryPropertiesRegistrar interface");
goto finish;
}
singletonInitialized = true;
}
{
BatteryProperty val;
status_t status = interface
->getProperty(android::BATTERY_PROP_CAPACITY, &val);
if (status == NO_ERROR) {
SLOGD("Capacity is %d", (int)val.valueInt64);
last_result = val.valueInt64;
} else {
SLOGE("Failed to get battery charge");
last_result = 100;
}
}
finish:
return last_result >= threshold;
}
}
extern "C"
{
int is_battery_ok_to_start()
{
return is_battery_ok(START_THRESHOLD);
}
int is_battery_ok_to_continue()
{
return is_battery_ok(CONTINUE_THRESHOLD);
}
}