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/*
* 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.
*/
#include "LearnedCapacityBackupRestore.h"
namespace device {
namespace google {
namespace bonito {
namespace health {
static constexpr char kChgFullDesignFile[] = "sys/class/power_supply/bms/charge_full_design";
static constexpr char kChgFullFile[] = "sys/class/power_supply/bms/charge_full";
static constexpr char kSysCFPersistFile[] = "/persist/battery/qcom_charge_full";
static constexpr int kBuffSize = 256;
LearnedCapacityBackupRestore::LearnedCapacityBackupRestore() {}
void LearnedCapacityBackupRestore::Restore() {
ReadPersistData();
ReadNominalCapacity();
ReadCapacity();
UpdateAndSave();
}
void LearnedCapacityBackupRestore::Backup() {
ReadCapacity();
UpdateAndSave();
}
void LearnedCapacityBackupRestore::ReadPersistData() {
std::string buffer;
if (!android::base::ReadFileToString(std::string(kSysCFPersistFile), &buffer)) {
LOG(ERROR) << "Cannot read the storage file";
return;
}
if (sscanf(buffer.c_str(), "%d", &sw_cap_) < 1)
LOG(ERROR) << "data format is wrong in the storage file: " << buffer;
else
LOG(INFO) << "Storage data: " << buffer;
}
void LearnedCapacityBackupRestore::SaveToStorage() {
char strData[kBuffSize];
snprintf(strData, kBuffSize, "%d", sw_cap_);
LOG(INFO) << "Save to Storage: " << strData;
if (!android::base::WriteStringToFile(strData, std::string(kSysCFPersistFile)))
LOG(ERROR) << "Write file error: " << strerror(errno);
}
void LearnedCapacityBackupRestore::ReadNominalCapacity() {
std::string buffer;
if (!android::base::ReadFileToString(std::string(kChgFullDesignFile), &buffer)) {
LOG(ERROR) << "Read nominal capacity error: " << strerror(errno);
return;
}
buffer = android::base::Trim(buffer);
if (sscanf(buffer.c_str(), "%d", &nom_cap_) < 1)
LOG(ERROR) << "Failed to parse nominal capacity: " << buffer;
else
LOG(INFO) << "nominal capacity: " << buffer;
}
void LearnedCapacityBackupRestore::ReadCapacity() {
std::string buffer;
if (!android::base::ReadFileToString(std::string(kChgFullFile), &buffer)) {
LOG(ERROR) << "Read capacity error: " << strerror(errno);
return;
}
buffer = android::base::Trim(buffer);
if (sscanf(buffer.c_str(), "%d", &hw_cap_) < 1)
LOG(ERROR) << "Failed to parse capacity: " << buffer;
else
LOG(INFO) << "capacity: " << buffer;
}
void LearnedCapacityBackupRestore::SaveToSRAM() {
char strData[kBuffSize];
snprintf(strData, kBuffSize, "%d", hw_cap_);
LOG(INFO) << "Save to SRAM: " << strData;
if (!android::base::WriteStringToFile(strData, std::string(kChgFullFile)))
LOG(ERROR) << "Write data error: " << strerror(errno);
}
void LearnedCapacityBackupRestore::UpdateAndSave() {
bool backup = false;
bool restore = false;
if (hw_cap_) {
if (((hw_cap_ != sw_cap_) && (hw_cap_ != nom_cap_)) ||
(sw_cap_ == 0)) {
sw_cap_ = hw_cap_;
backup = true;
} else if ((sw_cap_ > 0) && (hw_cap_ == nom_cap_)) {
hw_cap_ = sw_cap_;
restore = true;
}
}
if (restore)
SaveToSRAM();
if (backup)
SaveToStorage();
}
} // namespace health
} // namespace bonito
} // namespace google
} // namespace device
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