| /* |
| * Copyright (C) 2018 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #define ATRACE_TAG (ATRACE_TAG_POWER | ATRACE_TAG_HAL) |
| #define LOG_TAG "android.hardware.power@1.2-service.wahoo-libperfmgr" |
| |
| #include <android-base/file.h> |
| #include <android-base/logging.h> |
| #include <android-base/properties.h> |
| #include <android-base/strings.h> |
| #include <android-base/stringprintf.h> |
| |
| #include <pixelpowerstats/Debugging.h> |
| |
| #include <mutex> |
| |
| #include <utils/Log.h> |
| #include <utils/Trace.h> |
| |
| #include "Power.h" |
| #include "power-helper.h" |
| |
| /* RPM runs at 19.2Mhz. Divide by 19200 for msec */ |
| #define RPM_CLK 19200 |
| |
| extern struct stat_pair rpm_stat_map[]; |
| |
| namespace android { |
| namespace hardware { |
| namespace power { |
| namespace V1_2 { |
| namespace implementation { |
| |
| using ::android::hardware::power::V1_0::Feature; |
| using ::android::hardware::power::V1_0::PowerStatePlatformSleepState; |
| using ::android::hardware::power::V1_0::Status; |
| using ::android::hardware::power::V1_1::PowerStateSubsystem; |
| using ::android::hardware::power::V1_1::PowerStateSubsystemSleepState; |
| using ::android::hardware::hidl_vec; |
| using ::android::hardware::Return; |
| using ::android::hardware::Void; |
| using ::hardware::google::pixel::powerstats::DumpPowerHal1_0PlatStatsToFd; |
| using ::hardware::google::pixel::powerstats::DumpPowerHal1_1SubsysStatsToFd; |
| |
| Power::Power() : |
| mHintManager(nullptr), |
| mInteractionHandler(nullptr), |
| mVRModeOn(false), |
| mSustainedPerfModeOn(false), |
| mEncoderModeOn(false), |
| mReady(false) { |
| mInitThread = |
| std::thread([this](){ |
| android::base::WaitForProperty(kPowerHalInitProp, "1"); |
| mHintManager = HintManager::GetFromJSON("/vendor/etc/powerhint.json"); |
| mInteractionHandler = std::make_unique<InteractionHandler>(mHintManager); |
| mInteractionHandler->Init(); |
| |
| std::string state = android::base::GetProperty(kPowerHalStateProp, ""); |
| if (state == "VIDEO_ENCODE") { |
| ALOGI("Initialize with VIDEO_ENCODE on"); |
| mHintManager->DoHint("VIDEO_ENCODE"); |
| mEncoderModeOn = true; |
| } else if (state == "SUSTAINED_PERFORMANCE") { |
| ALOGI("Initialize with SUSTAINED_PERFORMANCE on"); |
| mHintManager->DoHint("SUSTAINED_PERFORMANCE"); |
| mSustainedPerfModeOn = true; |
| } else if (state == "VR_MODE") { |
| ALOGI("Initialize with VR_MODE on"); |
| mHintManager->DoHint("VR_MODE"); |
| mVRModeOn = true; |
| } else if (state == "VR_SUSTAINED_PERFORMANCE") { |
| ALOGI("Initialize with SUSTAINED_PERFORMANCE and VR_MODE on"); |
| mHintManager->DoHint("VR_SUSTAINED_PERFORMANCE"); |
| mSustainedPerfModeOn = true; |
| mVRModeOn = true; |
| } else { |
| ALOGI("Initialize PowerHAL"); |
| } |
| |
| state = android::base::GetProperty(kPowerHalAudioProp, ""); |
| if (state == "LOW_LATENCY") { |
| ALOGI("Initialize with AUDIO_LOW_LATENCY on"); |
| mHintManager->DoHint("AUDIO_LOW_LATENCY"); |
| } |
| |
| // Now start to take powerhint |
| mReady.store(true); |
| }); |
| mInitThread.detach(); |
| } |
| |
| // Methods from ::android::hardware::power::V1_0::IPower follow. |
| Return<void> Power::setInteractive(bool /* interactive */) { |
| return Void(); |
| } |
| |
| Return<void> Power::powerHint(PowerHint_1_0 hint, int32_t data) { |
| if (!isSupportedGovernor() || !mReady) { |
| return Void(); |
| } |
| |
| switch(hint) { |
| case PowerHint_1_0::INTERACTION: |
| if (mVRModeOn || mSustainedPerfModeOn) { |
| ALOGV("%s: ignoring due to other active perf hints", __func__); |
| } else { |
| mInteractionHandler->Acquire(data); |
| } |
| break; |
| case PowerHint_1_0::VIDEO_ENCODE: |
| if (mVRModeOn || mSustainedPerfModeOn) { |
| ALOGV("%s: ignoring due to other active perf hints", __func__); |
| break; |
| } |
| ATRACE_BEGIN("video_encode"); |
| if (mVRModeOn || mSustainedPerfModeOn) { |
| ALOGV("%s: ignoring due to other active perf hints", __func__); |
| } else { |
| if (data) { |
| // Hint until canceled |
| ATRACE_INT("video_encode_lock", 1); |
| mHintManager->DoHint("VIDEO_ENCODE"); |
| ALOGD("VIDEO_ENCODE ON"); |
| if (!android::base::SetProperty(kPowerHalStateProp, "VIDEO_ENCODE")) { |
| ALOGE("%s: could not set powerHAL state property to VIDEO_ENCODE", __func__); |
| } |
| mEncoderModeOn = true; |
| } else { |
| ATRACE_INT("video_encode_lock", 0); |
| mHintManager->EndHint("VIDEO_ENCODE"); |
| ALOGD("VIDEO_ENCODE OFF"); |
| if (!android::base::SetProperty(kPowerHalStateProp, "")) { |
| ALOGE("%s: could not clear powerHAL state property", __func__); |
| } |
| mEncoderModeOn = false; |
| } |
| } |
| ATRACE_END(); |
| break; |
| case PowerHint_1_0::SUSTAINED_PERFORMANCE: |
| if (data && !mSustainedPerfModeOn) { |
| ALOGD("SUSTAINED_PERFORMANCE ON"); |
| if (!mVRModeOn) { // Sustained mode only. |
| mHintManager->DoHint("SUSTAINED_PERFORMANCE"); |
| if (!android::base::SetProperty(kPowerHalStateProp, "SUSTAINED_PERFORMANCE")) { |
| ALOGE("%s: could not set powerHAL state property to SUSTAINED_PERFORMANCE", __func__); |
| } |
| } else { // Sustained + VR mode. |
| mHintManager->EndHint("VR_MODE"); |
| mHintManager->DoHint("VR_SUSTAINED_PERFORMANCE"); |
| if (!android::base::SetProperty(kPowerHalStateProp, "VR_SUSTAINED_PERFORMANCE")) { |
| ALOGE("%s: could not set powerHAL state property to VR_SUSTAINED_PERFORMANCE", __func__); |
| } |
| } |
| mSustainedPerfModeOn = true; |
| } else if (!data && mSustainedPerfModeOn) { |
| ALOGD("SUSTAINED_PERFORMANCE OFF"); |
| mHintManager->EndHint("VR_SUSTAINED_PERFORMANCE"); |
| mHintManager->EndHint("SUSTAINED_PERFORMANCE"); |
| if (mVRModeOn) { // Switch back to VR Mode. |
| mHintManager->DoHint("VR_MODE"); |
| if (!android::base::SetProperty(kPowerHalStateProp, "VR_MODE")) { |
| ALOGE("%s: could not set powerHAL state property to VR_MODE", __func__); |
| } |
| } else { |
| if (!android::base::SetProperty(kPowerHalStateProp, "")) { |
| ALOGE("%s: could not clear powerHAL state property", __func__); |
| } |
| } |
| mSustainedPerfModeOn = false; |
| } |
| break; |
| case PowerHint_1_0::VR_MODE: |
| if (data && !mVRModeOn) { |
| ALOGD("VR_MODE ON"); |
| if (!mSustainedPerfModeOn) { // VR mode only. |
| mHintManager->DoHint("VR_MODE"); |
| if (!android::base::SetProperty(kPowerHalStateProp, "VR_MODE")) { |
| ALOGE("%s: could not set powerHAL state property to VR_MODE", __func__); |
| } |
| } else { // Sustained + VR mode. |
| mHintManager->EndHint("SUSTAINED_PERFORMANCE"); |
| mHintManager->DoHint("VR_SUSTAINED_PERFORMANCE"); |
| if (!android::base::SetProperty(kPowerHalStateProp, "VR_SUSTAINED_PERFORMANCE")) { |
| ALOGE("%s: could not set powerHAL state property to VR_SUSTAINED_PERFORMANCE", __func__); |
| } |
| } |
| mVRModeOn = true; |
| } else if (!data && mVRModeOn) { |
| ALOGD("VR_MODE OFF"); |
| mHintManager->EndHint("VR_SUSTAINED_PERFORMANCE"); |
| mHintManager->EndHint("VR_MODE"); |
| if (mSustainedPerfModeOn) { // Switch back to sustained Mode. |
| mHintManager->DoHint("SUSTAINED_PERFORMANCE"); |
| if (!android::base::SetProperty(kPowerHalStateProp, "SUSTAINED_PERFORMANCE")) { |
| ALOGE("%s: could not set powerHAL state property to SUSTAINED_PERFORMANCE", __func__); |
| } |
| } else { |
| if (!android::base::SetProperty(kPowerHalStateProp, "")) { |
| ALOGE("%s: could not clear powerHAL state property", __func__); |
| } |
| } |
| mVRModeOn = false; |
| } |
| break; |
| case PowerHint_1_0::LAUNCH: |
| ATRACE_BEGIN("launch"); |
| if (mVRModeOn || mSustainedPerfModeOn) { |
| ALOGV("%s: ignoring due to other active perf hints", __func__); |
| } else { |
| if (data) { |
| // Hint until canceled |
| ATRACE_INT("launch_lock", 1); |
| mHintManager->DoHint("LAUNCH"); |
| ALOGD("LAUNCH ON"); |
| } else { |
| ATRACE_INT("launch_lock", 0); |
| mHintManager->EndHint("LAUNCH"); |
| ALOGD("LAUNCH OFF"); |
| } |
| } |
| ATRACE_END(); |
| break; |
| default: |
| break; |
| |
| } |
| return Void(); |
| } |
| |
| Return<void> Power::setFeature(Feature /*feature*/, bool /*activate*/) { |
| //Nothing to do |
| return Void(); |
| } |
| |
| Return<void> Power::getPlatformLowPowerStats(getPlatformLowPowerStats_cb _hidl_cb) { |
| |
| hidl_vec<PowerStatePlatformSleepState> states; |
| uint64_t stats[MAX_PLATFORM_STATS * MAX_RPM_PARAMS] = {0}; |
| uint64_t *values; |
| struct PowerStatePlatformSleepState *state; |
| int ret; |
| |
| states.resize(PLATFORM_SLEEP_MODES_COUNT); |
| |
| ret = extract_platform_stats(stats); |
| if (ret != 0) { |
| states.resize(0); |
| goto done; |
| } |
| |
| /* Update statistics for XO_shutdown */ |
| state = &states[RPM_MODE_XO]; |
| state->name = "XO_shutdown"; |
| values = stats + (RPM_MODE_XO * MAX_RPM_PARAMS); |
| |
| state->residencyInMsecSinceBoot = values[1]; |
| state->totalTransitions = values[0]; |
| state->supportedOnlyInSuspend = false; |
| state->voters.resize(XO_VOTERS); |
| for(size_t i = 0; i < XO_VOTERS; i++) { |
| int voter = static_cast<int>(i + XO_VOTERS_START); |
| state->voters[i].name = rpm_stat_map[voter].label; |
| values = stats + (voter * MAX_RPM_PARAMS); |
| state->voters[i].totalTimeInMsecVotedForSinceBoot = values[0] / RPM_CLK; |
| state->voters[i].totalNumberOfTimesVotedSinceBoot = values[1]; |
| } |
| |
| /* Update statistics for VMIN state */ |
| state = &states[RPM_MODE_VMIN]; |
| state->name = "VMIN"; |
| values = stats + (RPM_MODE_VMIN * MAX_RPM_PARAMS); |
| |
| state->residencyInMsecSinceBoot = values[1]; |
| state->totalTransitions = values[0]; |
| state->supportedOnlyInSuspend = false; |
| state->voters.resize(VMIN_VOTERS); |
| //Note: No filling of state voters since VMIN_VOTERS = 0 |
| |
| done: |
| _hidl_cb(states, Status::SUCCESS); |
| return Void(); |
| } |
| |
| static int get_wlan_low_power_stats(struct PowerStateSubsystem *subsystem) { |
| uint64_t stats[WLAN_POWER_PARAMS_COUNT] = {0}; |
| struct PowerStateSubsystemSleepState *state; |
| |
| subsystem->name = "wlan"; |
| |
| if (extract_wlan_stats(stats) != 0) { |
| subsystem->states.resize(0); |
| return -1; |
| } |
| |
| subsystem->states.resize(WLAN_STATES_COUNT); |
| |
| /* Update statistics for Active State */ |
| state = &subsystem->states[WLAN_STATE_ACTIVE]; |
| state->name = "Active"; |
| state->residencyInMsecSinceBoot = stats[CUMULATIVE_TOTAL_ON_TIME_MS]; |
| state->totalTransitions = stats[DEEP_SLEEP_ENTER_COUNTER]; |
| state->lastEntryTimestampMs = 0; //FIXME need a new value from Qcom |
| state->supportedOnlyInSuspend = false; |
| |
| /* Update statistics for Deep-Sleep state */ |
| state = &subsystem->states[WLAN_STATE_DEEP_SLEEP]; |
| state->name = "Deep-Sleep"; |
| state->residencyInMsecSinceBoot = stats[CUMULATIVE_SLEEP_TIME_MS]; |
| state->totalTransitions = stats[DEEP_SLEEP_ENTER_COUNTER]; |
| state->lastEntryTimestampMs = stats[LAST_DEEP_SLEEP_ENTER_TSTAMP_MS]; |
| state->supportedOnlyInSuspend = false; |
| |
| return 0; |
| } |
| |
| enum easel_state { |
| EASEL_OFF = 0, |
| EASEL_ON, |
| EASEL_SUSPENDED, |
| NUM_EASEL_STATES |
| }; |
| |
| // Get low power stats for easel subsystem |
| static int get_easel_low_power_stats(struct PowerStateSubsystem *subsystem) { |
| // This implementation is a workaround to provide minimal visibility into |
| // Easel state behavior until canonical low power stats are supported. |
| // It takes an "external observer" snapshot of the current Easel state every |
| // time it is called, and synthesizes an artificial sleep state that will |
| // behave similarly to real stats if Easel gets "wedged" in the "on" state. |
| static std::mutex statsLock; |
| static uint64_t totalOnSnapshotCount = 0; |
| static uint64_t totalNotOnSnapshotCount = 0; |
| unsigned long currentState; |
| struct PowerStateSubsystemSleepState *state; |
| |
| subsystem->name = "Easel"; |
| |
| if (get_easel_state(¤tState) != 0) { |
| subsystem->states.resize(0); |
| return -1; |
| } |
| |
| if (currentState >= NUM_EASEL_STATES) { |
| ALOGE("%s: unrecognized Easel state(%lu)", __func__, currentState); |
| return -1; |
| } |
| |
| subsystem->states.resize(1); |
| |
| // Since we are storing stats locally but can have multiple parallel |
| // callers, locking is required to ensure stats are not corrupted. |
| std::lock_guard<std::mutex> lk(statsLock); |
| |
| // Update statistics for synthetic sleep state. We combine OFF and |
| // SUSPENDED to act as a composite "not on" state so the numbers will behave |
| // like a real sleep state. |
| if ((currentState == EASEL_OFF) || (currentState == EASEL_SUSPENDED)) { |
| totalNotOnSnapshotCount++; |
| } else { |
| totalOnSnapshotCount++; |
| } |
| |
| // Update statistics for synthetic sleep state, where |
| // totalTransitions = cumulative count of Easel state0 (as seen by PowerHAL) |
| // residencyInMsecsSinceBoot = cumulative count of Easel state1 (as seen by |
| // PowerHAL) |
| // lastEntryTimestampMs = cumulative count of Easel state2 (as seen by |
| // PowerHAL) |
| state = &subsystem->states[0]; |
| state->name = "SyntheticSleep"; |
| state->totalTransitions = totalOnSnapshotCount; |
| state->residencyInMsecSinceBoot = totalNotOnSnapshotCount; |
| state->lastEntryTimestampMs = 0; // No added value for the workaround |
| state->supportedOnlyInSuspend = false; |
| |
| return 0; |
| } |
| |
| // Methods from ::android::hardware::power::V1_1::IPower follow. |
| Return<void> Power::getSubsystemLowPowerStats(getSubsystemLowPowerStats_cb _hidl_cb) { |
| hidl_vec<PowerStateSubsystem> subsystems; |
| |
| subsystems.resize(SUBSYSTEM_COUNT); |
| |
| // Get WLAN subsystem low power stats. |
| if (get_wlan_low_power_stats(&subsystems[SUBSYSTEM_WLAN]) != 0) { |
| ALOGE("%s: failed to process wlan stats", __func__); |
| } |
| |
| // Get Easel subsystem low power stats. |
| if (get_easel_low_power_stats(&subsystems[SUBSYSTEM_EASEL]) != 0) { |
| ALOGE("%s: failed to process Easel stats", __func__); |
| } |
| |
| _hidl_cb(subsystems, Status::SUCCESS); |
| return Void(); |
| } |
| |
| bool Power::isSupportedGovernor() { |
| std::string buf; |
| if (android::base::ReadFileToString("/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor", &buf)) { |
| buf = android::base::Trim(buf); |
| } |
| // Only support EAS 1.2, legacy EAS |
| if (buf == "schedutil" || buf == "sched") { |
| return true; |
| } else { |
| LOG(ERROR) << "Governor not supported by powerHAL, skipping"; |
| return false; |
| } |
| } |
| |
| Return<void> Power::powerHintAsync(PowerHint_1_0 hint, int32_t data) { |
| // just call the normal power hint in this oneway function |
| return powerHint(hint, data); |
| } |
| |
| // Methods from ::android::hardware::power::V1_2::IPower follow. |
| Return<void> Power::powerHintAsync_1_2(PowerHint_1_2 hint, int32_t data) { |
| if (!isSupportedGovernor() || !mReady) { |
| return Void(); |
| } |
| |
| switch(hint) { |
| case PowerHint_1_2::AUDIO_LOW_LATENCY: |
| ATRACE_BEGIN("audio_low_latency"); |
| if (data) { |
| // Hint until canceled |
| ATRACE_INT("audio_low_latency_lock", 1); |
| mHintManager->DoHint("AUDIO_LOW_LATENCY"); |
| ALOGD("AUDIO LOW LATENCY ON"); |
| if (!android::base::SetProperty(kPowerHalAudioProp, "LOW_LATENCY")) { |
| ALOGE("%s: could not set powerHAL audio state property to LOW_LATENCY", __func__); |
| } |
| } else { |
| ATRACE_INT("audio_low_latency_lock", 0); |
| mHintManager->EndHint("AUDIO_LOW_LATENCY"); |
| ALOGD("AUDIO LOW LATENCY OFF"); |
| if (!android::base::SetProperty(kPowerHalAudioProp, "")) { |
| ALOGE("%s: could not clear powerHAL audio state property", __func__); |
| } |
| } |
| ATRACE_END(); |
| break; |
| case PowerHint_1_2::AUDIO_STREAMING: |
| ATRACE_BEGIN("audio_streaming"); |
| if (mVRModeOn || mSustainedPerfModeOn) { |
| ALOGV("%s: ignoring due to other active perf hints", __func__); |
| } else { |
| if (data) { |
| // Hint until canceled |
| ATRACE_INT("audio_streaming_lock", 1); |
| mHintManager->DoHint("AUDIO_STREAMING"); |
| ALOGD("AUDIO STREAMING ON"); |
| } else { |
| ATRACE_INT("audio_streaming_lock", 0); |
| mHintManager->EndHint("AUDIO_STREAMING"); |
| ALOGD("AUDIO STREAMING OFF"); |
| } |
| } |
| ATRACE_END(); |
| break; |
| case PowerHint_1_2::CAMERA_LAUNCH: |
| ATRACE_BEGIN("camera_launch"); |
| if (data > 0) { |
| ATRACE_INT("camera_launch_lock", 1); |
| mHintManager->DoHint("CAMERA_LAUNCH", std::chrono::milliseconds(data)); |
| ALOGD("CAMERA LAUNCH ON: %d MS, LAUNCH ON: 2500 MS", data); |
| // boosts 2.5s for launching |
| mHintManager->DoHint("LAUNCH", std::chrono::milliseconds(2500)); |
| } else if (data == 0) { |
| ATRACE_INT("camera_launch_lock", 0); |
| mHintManager->EndHint("CAMERA_LAUNCH"); |
| ALOGD("CAMERA LAUNCH OFF"); |
| } else { |
| ALOGE("CAMERA LAUNCH INVALID DATA: %d", data); |
| } |
| ATRACE_END(); |
| break; |
| case PowerHint_1_2::CAMERA_STREAMING: |
| ATRACE_BEGIN("camera_streaming"); |
| if (data > 0) { |
| ATRACE_INT("camera_streaming_lock", 1); |
| mHintManager->DoHint("CAMERA_STREAMING", std::chrono::milliseconds(data)); |
| ALOGD("CAMERA STREAMING ON: %d MS", data); |
| } else if (data == 0) { |
| ATRACE_INT("camera_streaming_lock", 0); |
| mHintManager->EndHint("CAMERA_STREAMING"); |
| ALOGD("CAMERA STREAMING OFF"); |
| } else { |
| ALOGE("CAMERA STREAMING INVALID DATA: %d", data); |
| } |
| ATRACE_END(); |
| break; |
| case PowerHint_1_2::CAMERA_SHOT: |
| ATRACE_BEGIN("camera_shot"); |
| if (data > 0) { |
| ATRACE_INT("camera_shot_lock", 1); |
| mHintManager->DoHint("CAMERA_SHOT", std::chrono::milliseconds(data)); |
| ALOGD("CAMERA SHOT ON: %d MS", data); |
| } else if (data == 0) { |
| ATRACE_INT("camera_shot_lock", 0); |
| mHintManager->EndHint("CAMERA_SHOT"); |
| ALOGD("CAMERA SHOT OFF"); |
| } else { |
| ALOGE("CAMERA SHOT INVALID DATA: %d", data); |
| } |
| ATRACE_END(); |
| break; |
| default: |
| return powerHint(static_cast<PowerHint_1_0>(hint), data); |
| } |
| return Void(); |
| } |
| |
| constexpr const char* boolToString(bool b) { |
| return b ? "true" : "false"; |
| } |
| |
| Return<void> Power::debug(const hidl_handle& handle, const hidl_vec<hidl_string>&) { |
| if (handle != nullptr && handle->numFds >= 1 && mReady) { |
| int fd = handle->data[0]; |
| |
| std::string buf(android::base::StringPrintf("HintManager Running: %s\n" |
| "VRMode: %s\n" |
| "SustainedPerformanceMode: %s\n" |
| "VideoEncodeMode: %s\n", |
| boolToString(mHintManager->IsRunning()), |
| boolToString(mVRModeOn), |
| boolToString(mSustainedPerfModeOn), |
| boolToString(mEncoderModeOn))); |
| // Dump nodes through libperfmgr |
| mHintManager->DumpToFd(fd); |
| if (!android::base::WriteStringToFd(buf, fd)) { |
| PLOG(ERROR) << "Failed to dump state to fd"; |
| } |
| |
| // Dump platform low power stats |
| getPlatformLowPowerStats([fd](const auto& platStats, const auto result) { |
| if (!DumpPowerHal1_0PlatStatsToFd(result, platStats, fd)) { |
| PLOG(ERROR) << "Failed to dump platform low power stats to fd"; |
| } |
| }); |
| |
| // Dump subsystem low power stats |
| getSubsystemLowPowerStats([fd](const auto& subsysStats, const auto result) { |
| if (!DumpPowerHal1_1SubsysStatsToFd(result, subsysStats, fd)) { |
| PLOG(ERROR) << "Failed to dump subsystem low power stats to fd"; |
| } |
| }); |
| |
| fsync(fd); |
| } |
| return Void(); |
| } |
| |
| } // namespace implementation |
| } // namespace V1_2 |
| } // namespace power |
| } // namespace hardware |
| } // namespace android |
