/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <pixelhealth/CycleCountBackupRestore.h>
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namespace hardware {
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namespace google {
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namespace pixel {
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namespace health {
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static constexpr int kBackupTrigger = 20;
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CycleCountBackupRestore::CycleCountBackupRestore(int nb_buckets, const char *sysfs_path,
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const char *persist_path, const char *serial_path)
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: nb_buckets_(nb_buckets),
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saved_soc_(-1),
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soc_inc_(0),
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sysfs_path_(sysfs_path),
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persist_path_(persist_path),
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serial_path_(serial_path) {
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sw_bins_ = new int[nb_buckets]();
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hw_bins_ = new int[nb_buckets]();
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}
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void CycleCountBackupRestore::Restore() {
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if (CheckSerial()) {
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Read(persist_path_, sw_bins_);
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}
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Read(sysfs_path_, hw_bins_);
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UpdateAndSave();
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}
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bool CycleCountBackupRestore::CheckSerial() {
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std::string device_battery_serial;
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std::string persist_battery_serial;
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if (serial_path_.empty())
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return true;
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if (!android::base::ReadFileToString(serial_path_, &device_battery_serial)) {
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LOG(ERROR) << "Failed to read " << serial_path_;
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return true;
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}
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if (!android::base::ReadFileToString(kPersistSerial, &persist_battery_serial)) {
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LOG(ERROR) << "Failed to read " << kPersistSerial;
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}
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if (device_battery_serial != persist_battery_serial) {
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// Battery pack has been changed or first time,
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// cycle counts on the pack are the ones to save
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if (!android::base::WriteStringToFile(device_battery_serial, kPersistSerial)) {
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LOG(ERROR) << "Write to " << kPersistSerial << " error: " << strerror(errno);
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}
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return false;
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}
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return true;
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}
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void CycleCountBackupRestore::Backup(int battery_level) {
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if (saved_soc_ == -1) {
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saved_soc_ = battery_level;
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return;
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}
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// Cycle counts only increases on increasing level
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if (battery_level > saved_soc_) {
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soc_inc_ += battery_level - saved_soc_;
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}
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saved_soc_ = battery_level;
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// To avoid writting file too often just rate limit it
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if (soc_inc_ >= kBackupTrigger) {
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Read(sysfs_path_, hw_bins_);
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UpdateAndSave();
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soc_inc_ = 0;
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}
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}
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void CycleCountBackupRestore::Read(const std::string &path, int *bins) {
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std::string buffer;
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if (!android::base::ReadFileToString(path, &buffer)) {
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LOG(ERROR) << "Failed to read " << path;
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return;
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}
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buffer = ::android::base::Trim(buffer);
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std::vector<std::string> counts = android::base::Split(buffer, " ");
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if (counts.size() != (size_t)nb_buckets_) {
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LOG(ERROR) << "data format \"" << buffer << "\" is wrong in " << path;
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} else {
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LOG(INFO) << "Read: \"" << buffer << "\" from " << path;
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for (int i = 0; i < nb_buckets_; ++i) {
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bins[i] = std::stoi(counts[i]);
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}
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}
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}
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void CycleCountBackupRestore::Write(int *bins, const std::string &path) {
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std::string str_data = "";
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for (int i = 0; i < nb_buckets_; ++i) {
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if (i) {
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str_data += " ";
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}
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str_data += std::to_string(bins[i]);
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}
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LOG(INFO) << "Write: \"" << str_data << "\" to " << path;
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if (!android::base::WriteStringToFile(str_data, path))
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LOG(ERROR) << "Write to " << path << " error: " << strerror(errno);
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}
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void CycleCountBackupRestore::UpdateAndSave() {
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bool backup = false;
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bool restore = false;
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for (int i = 0; i < nb_buckets_; i++) {
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if (hw_bins_[i] < sw_bins_[i]) {
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hw_bins_[i] = sw_bins_[i];
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restore = true;
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} else if (hw_bins_[i] > sw_bins_[i]) {
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sw_bins_[i] = hw_bins_[i];
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backup = true;
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}
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}
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if (restore)
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Write(hw_bins_, sysfs_path_);
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if (backup)
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Write(sw_bins_, persist_path_);
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}
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} // namespace health
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} // namespace pixel
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} // namespace google
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} // namespace hardware
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