1 /*
2 * Copyright (C) 2022 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 "chre_host/time_syncer.h"
18 #include <chre_host/host_protocol_host.h>
19 #include "chre_host/log.h"
20
21 namespace android::chre {
22 // TODO(b/247124878): Can we add a static assert to make sure these functions
23 // are not called when connection->isTimeSyncNeeded() returns false?
sendTimeSync(ChreConnection * connection)24 bool TimeSyncer::sendTimeSync(ChreConnection *connection) {
25 if (!connection->isTimeSyncNeeded()) {
26 LOGW("Platform doesn't require time sync. Ignore the request.");
27 return true;
28 }
29 int64_t timeOffsetUs = 0;
30 if (!connection->getTimeOffset(&timeOffsetUs)) {
31 LOGE("Failed to get time offset.");
32 return false;
33 }
34 flatbuffers::FlatBufferBuilder builder(64);
35 // clientId doesn't matter for time sync request so the default id is used.
36 HostProtocolHost::encodeTimeSyncMessage(builder, timeOffsetUs);
37 return connection->sendMessage(builder.GetBufferPointer(), builder.GetSize());
38 }
39
sendTimeSyncWithRetry(ChreConnection * connection,size_t numOfRetries,useconds_t retryDelayUs)40 bool TimeSyncer::sendTimeSyncWithRetry(ChreConnection *connection,
41 size_t numOfRetries,
42 useconds_t retryDelayUs) {
43 if (!connection->isTimeSyncNeeded()) {
44 LOGW("Platform doesn't require time sync. Ignore the request.");
45 return true;
46 }
47 bool success = false;
48 while (!success && (numOfRetries-- > 0)) {
49 success = sendTimeSync(connection);
50 if (!success) {
51 usleep(retryDelayUs);
52 }
53 }
54 return success;
55 }
56 } // namespace android::chre