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
31 namespace android {
32
publish(const sp<BatteryPropertiesRegistrar> & service)33 void BatteryPropertiesRegistrar::publish(
34 const sp<BatteryPropertiesRegistrar>& service) {
35 defaultServiceManager()->addService(String16("batteryproperties"), service);
36 }
37
notifyListeners(const struct BatteryProperties & props)38 void 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
registerListener(const sp<IBatteryPropertiesListener> & listener)55 void 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
unregisterListener(const sp<IBatteryPropertiesListener> & listener)73 void 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
getProperty(int id,struct BatteryProperty * val)86 status_t BatteryPropertiesRegistrar::getProperty(int id, struct BatteryProperty *val) {
87 return healthd_get_property(id, val);
88 }
89
scheduleUpdate()90 void BatteryPropertiesRegistrar::scheduleUpdate() {
91 healthd_battery_update();
92 }
93
dump(int fd,const Vector<String16> &)94 status_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
binderDied(const wp<IBinder> & who)107 void 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