1 /*
2 * Copyright (C) 2020 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 #define LOG_TAG "[email protected]"
18
19 #include <errno.h>
20 #include <unistd.h>
21
22 #include <cutils/sockets.h>
23 #include <log/log.h>
24
25 #include "DisplayLowPower.h"
26
DisplayLowPower()27 DisplayLowPower::DisplayLowPower() : mFossStatus(false) {}
28
Init()29 void DisplayLowPower::Init() {
30 ConnectPpsDaemon();
31 }
32
SetDisplayLowPower(bool enable)33 void DisplayLowPower::SetDisplayLowPower(bool enable) {
34 SetFoss(enable);
35 }
36
ConnectPpsDaemon()37 void DisplayLowPower::ConnectPpsDaemon() {
38 constexpr const char kPpsDaemon[] = "pps";
39
40 mPpsSocket.reset(
41 socket_local_client(kPpsDaemon, ANDROID_SOCKET_NAMESPACE_RESERVED, SOCK_STREAM));
42 if (mPpsSocket.get() < 0) {
43 ALOGW("Connecting to PPS daemon failed (%s)", strerror(errno));
44 }
45 }
46
SendPpsCommand(const std::string_view cmd)47 int DisplayLowPower::SendPpsCommand(const std::string_view cmd) {
48 if (TEMP_FAILURE_RETRY(write(mPpsSocket.get(), cmd.data(), cmd.size())) < 0) {
49 ALOGE("Failed to send pps command '%s' over socket (%s)", cmd.data(), strerror(errno));
50 return -1;
51 }
52
53 return 0;
54 }
55
SetFoss(bool enable)56 void DisplayLowPower::SetFoss(bool enable) {
57 if (mPpsSocket.get() < 0 || mFossStatus == enable) {
58 return;
59 }
60
61 ALOGI("%s foss", (enable) ? "Enable" : "Disable");
62
63 std::string_view foss_cmd;
64 if (enable) {
65 foss_cmd = "foss:on";
66 } else {
67 foss_cmd = "foss:off";
68 }
69
70 if (!SendPpsCommand(foss_cmd)) {
71 mFossStatus = enable;
72 }
73 }
74