1/*
2 * Copyright (C) 2014 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 "VoldCheckBattery"
18#include <cutils/log.h>
19
20#include <binder/IServiceManager.h>
21#include <batteryservice/IBatteryPropertiesRegistrar.h>
22
23using namespace android;
24
25namespace
26{
27    // How often to check battery in seconds
28    const int CHECK_PERIOD = 30;
29
30    // How charged should the battery be (percent) to start encrypting
31    const int START_THRESHOLD = 10;
32
33    // How charged should the battery be (percent) to continue encrypting
34    const int CONTINUE_THRESHOLD = 5;
35
36    const String16 serviceName("batteryproperties");
37
38    sp<IBinder> bs;
39    sp<IBatteryPropertiesRegistrar> interface;
40
41    bool singletonInitialized = false;
42    time_t last_checked = {0};
43    int last_result = 100;
44
45    int is_battery_ok(int threshold)
46    {
47        time_t now = time(NULL);
48        if (now == -1 || difftime(now, last_checked) < 5) {
49            goto finish;
50        }
51        last_checked = now;
52
53        if (!singletonInitialized) {
54            bs = defaultServiceManager()->checkService(serviceName);
55            if (bs == NULL) {
56                SLOGE("No batteryproperties service!");
57                goto finish;
58            }
59
60            interface = interface_cast<IBatteryPropertiesRegistrar>(bs);
61            if (interface == NULL) {
62                SLOGE("No IBatteryPropertiesRegistrar interface");
63                goto finish;
64            }
65
66            singletonInitialized = true;
67        }
68
69        {
70            BatteryProperty val;
71            status_t status = interface
72                ->getProperty(android::BATTERY_PROP_CAPACITY, &val);
73            if (status == NO_ERROR) {
74                SLOGD("Capacity is %d", (int)val.valueInt64);
75                last_result = val.valueInt64;
76            } else {
77                SLOGE("Failed to get battery charge");
78                last_result = 100;
79            }
80        }
81
82    finish:
83        return last_result >= threshold;
84    }
85}
86
87extern "C"
88{
89    int is_battery_ok_to_start()
90    {
91      // Bug 16868177 exists to purge this code completely
92      return true; //is_battery_ok(START_THRESHOLD);
93    }
94
95    int is_battery_ok_to_continue()
96    {
97      // Bug 16868177 exists to purge this code completely
98      return true; //is_battery_ok(CONTINUE_THRESHOLD);
99    }
100}
101