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#include "BatteryPropertiesRegistrar.h"
18#include <batteryservice/BatteryService.h>
19#include <batteryservice/IBatteryPropertiesListener.h>
20#include <batteryservice/IBatteryPropertiesRegistrar.h>
21#include <binder/IPCThreadState.h>
22#include <binder/IServiceManager.h>
23#include <binder/PermissionCache.h>
24#include <private/android_filesystem_config.h>
25#include <utils/Errors.h>
26#include <utils/Mutex.h>
27#include <utils/String16.h>
28
29#include <healthd/healthd.h>
30
31namespace android {
32
33void BatteryPropertiesRegistrar::publish(
34    const sp<BatteryPropertiesRegistrar>& service) {
35    defaultServiceManager()->addService(String16("batteryproperties"), service);
36}
37
38void BatteryPropertiesRegistrar::notifyListeners(const struct BatteryProperties& props) {
39    Vector<sp<IBatteryPropertiesListener> > listenersCopy;
40
41    // Binder currently may service an incoming oneway transaction whenever an
42    // outbound oneway call is made (if there is already a pending incoming
43    // oneway call waiting).  This is considered a bug and may change in the
44    // future.  For now, avoid recursive mutex lock while making outbound
45    // calls by making a local copy of the current list of listeners.
46    {
47        Mutex::Autolock _l(mRegistrationLock);
48        listenersCopy = mListeners;
49    }
50    for (size_t i = 0; i < listenersCopy.size(); i++) {
51        listenersCopy[i]->batteryPropertiesChanged(props);
52    }
53}
54
55void BatteryPropertiesRegistrar::registerListener(const sp<IBatteryPropertiesListener>& listener) {
56    {
57        if (listener == NULL)
58            return;
59        Mutex::Autolock _l(mRegistrationLock);
60        // check whether this is a duplicate
61        for (size_t i = 0; i < mListeners.size(); i++) {
62            if (IInterface::asBinder(mListeners[i]) == IInterface::asBinder(listener)) {
63                return;
64            }
65        }
66
67        mListeners.add(listener);
68        IInterface::asBinder(listener)->linkToDeath(this);
69    }
70    healthd_battery_update();
71}
72
73void BatteryPropertiesRegistrar::unregisterListener(const sp<IBatteryPropertiesListener>& listener) {
74    if (listener == NULL)
75        return;
76    Mutex::Autolock _l(mRegistrationLock);
77    for (size_t i = 0; i < mListeners.size(); i++) {
78        if (IInterface::asBinder(mListeners[i]) == IInterface::asBinder(listener)) {
79            IInterface::asBinder(mListeners[i])->unlinkToDeath(this);
80            mListeners.removeAt(i);
81            break;
82        }
83    }
84}
85
86status_t BatteryPropertiesRegistrar::getProperty(int id, struct BatteryProperty *val) {
87    return healthd_get_property(id, val);
88}
89
90void BatteryPropertiesRegistrar::scheduleUpdate() {
91    healthd_battery_update();
92}
93
94status_t BatteryPropertiesRegistrar::dump(int fd, const Vector<String16>& /*args*/) {
95    IPCThreadState* self = IPCThreadState::self();
96    const int pid = self->getCallingPid();
97    const int uid = self->getCallingUid();
98    if ((uid != AID_SHELL) &&
99        !PermissionCache::checkPermission(
100                String16("android.permission.DUMP"), pid, uid))
101        return PERMISSION_DENIED;
102
103    healthd_dump_battery_state(fd);
104    return OK;
105}
106
107void BatteryPropertiesRegistrar::binderDied(const wp<IBinder>& who) {
108    Mutex::Autolock _l(mRegistrationLock);
109
110    for (size_t i = 0; i < mListeners.size(); i++) {
111        if (IInterface::asBinder(mListeners[i]) == who) {
112            mListeners.removeAt(i);
113            break;
114        }
115    }
116}
117
118}  // namespace android
119