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1 /*
2  * Copyright 2021 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 "SystemSuspendHidl.h"
18 
19 #include <hwbinder/IPCThreadState.h>
20 
21 using ::android::hardware::Void;
22 
23 namespace android {
24 namespace system {
25 namespace suspend {
26 namespace V1_0 {
27 
getCallingPid()28 static inline int getCallingPid() {
29     return ::android::hardware::IPCThreadState::self()->getCallingPid();
30 }
31 
WakeLock(SystemSuspend * systemSuspend,const std::string & name,int pid)32 WakeLock::WakeLock(SystemSuspend* systemSuspend, const std::string& name, int pid)
33     : mReleased(), mSystemSuspend(systemSuspend), mName(name), mPid(pid) {
34     mSystemSuspend->incSuspendCounter(mName);
35     mSystemSuspend->updateWakeLockStatOnAcquire(mName, mPid);
36 }
37 
~WakeLock()38 WakeLock::~WakeLock() {
39     releaseOnce();
40 }
41 
release()42 Return<void> WakeLock::release() {
43     releaseOnce();
44     return Void();
45 }
46 
releaseOnce()47 void WakeLock::releaseOnce() {
48     std::call_once(mReleased, [this]() {
49         mSystemSuspend->decSuspendCounter(mName);
50         mSystemSuspend->updateWakeLockStatOnRelease(mName, mPid);
51     });
52 }
53 
SystemSuspendHidl(SystemSuspend * systemSuspend)54 SystemSuspendHidl::SystemSuspendHidl(SystemSuspend* systemSuspend)
55     : mSystemSuspend(systemSuspend) {}
56 
acquireWakeLock(WakeLockType,const hidl_string & name)57 Return<sp<IWakeLock>> SystemSuspendHidl::acquireWakeLock(WakeLockType /* type */,
58                                                          const hidl_string& name) {
59     auto pid = getCallingPid();
60     IWakeLock* wl = new WakeLock{mSystemSuspend, name, pid};
61     return wl;
62 }
63 
64 }  // namespace V1_0
65 }  // namespace suspend
66 }  // namespace system
67 }  // namespace android
68