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      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 
     33 void BatteryPropertiesRegistrar::publish(
     34     const sp<BatteryPropertiesRegistrar>& service) {
     35     defaultServiceManager()->addService(String16("batteryproperties"), service);
     36 }
     37 
     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 
     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 
     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 
     86 status_t BatteryPropertiesRegistrar::getProperty(int id, struct BatteryProperty *val) {
     87     return healthd_get_property(id, val);
     88 }
     89 
     90 void BatteryPropertiesRegistrar::scheduleUpdate() {
     91     healthd_battery_update();
     92 }
     93 
     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 
    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