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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.h"
     30 
     31 namespace android {
     32 
     33 void BatteryPropertiesRegistrar::publish() {
     34     defaultServiceManager()->addService(String16("batteryproperties"), this);
     35 }
     36 
     37 void BatteryPropertiesRegistrar::notifyListeners(struct BatteryProperties props) {
     38     Mutex::Autolock _l(mRegistrationLock);
     39     for (size_t i = 0; i < mListeners.size(); i++) {
     40         mListeners[i]->batteryPropertiesChanged(props);
     41     }
     42 }
     43 
     44 void BatteryPropertiesRegistrar::registerListener(const sp<IBatteryPropertiesListener>& listener) {
     45     {
     46         if (listener == NULL)
     47             return;
     48         Mutex::Autolock _l(mRegistrationLock);
     49         // check whether this is a duplicate
     50         for (size_t i = 0; i < mListeners.size(); i++) {
     51             if (mListeners[i]->asBinder() == listener->asBinder()) {
     52                 return;
     53             }
     54         }
     55 
     56         mListeners.add(listener);
     57         listener->asBinder()->linkToDeath(this);
     58     }
     59     healthd_battery_update();
     60 }
     61 
     62 void BatteryPropertiesRegistrar::unregisterListener(const sp<IBatteryPropertiesListener>& listener) {
     63     if (listener == NULL)
     64         return;
     65     Mutex::Autolock _l(mRegistrationLock);
     66     for (size_t i = 0; i < mListeners.size(); i++) {
     67         if (mListeners[i]->asBinder() == listener->asBinder()) {
     68             mListeners[i]->asBinder()->unlinkToDeath(this);
     69             mListeners.removeAt(i);
     70             break;
     71         }
     72     }
     73 }
     74 
     75 status_t BatteryPropertiesRegistrar::getProperty(int id, struct BatteryProperty *val) {
     76     return healthd_get_property(id, val);
     77 }
     78 
     79 status_t BatteryPropertiesRegistrar::dump(int fd, const Vector<String16>& /*args*/) {
     80     IPCThreadState* self = IPCThreadState::self();
     81     const int pid = self->getCallingPid();
     82     const int uid = self->getCallingUid();
     83     if ((uid != AID_SHELL) &&
     84         !PermissionCache::checkPermission(
     85                 String16("android.permission.DUMP"), pid, uid))
     86         return PERMISSION_DENIED;
     87 
     88     healthd_dump_battery_state(fd);
     89     return OK;
     90 }
     91 
     92 void BatteryPropertiesRegistrar::binderDied(const wp<IBinder>& who) {
     93     Mutex::Autolock _l(mRegistrationLock);
     94 
     95     for (size_t i = 0; i < mListeners.size(); i++) {
     96         if (mListeners[i]->asBinder() == who) {
     97             mListeners.removeAt(i);
     98             break;
     99         }
    100     }
    101 }
    102 
    103 }  // namespace android
    104