| // Copyright 2019 The Chromium OS Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "thermald/iio_temperature_sensor.h" |
| |
| #include <string> |
| |
| #include "base/files/file_enumerator.h" |
| #include "base/files/file_path.h" |
| #include "base/files/file_util.h" |
| #include "base/logging.h" |
| #include "base/strings/string_number_conversions.h" |
| #include "base/strings/stringprintf.h" |
| |
| using std::stoi; |
| using std::string; |
| using std::to_string; |
| |
| namespace thermald { |
| |
| std::unique_ptr<IioTemperatureSensor> |
| IioTemperatureSensor::Get(const string &name, const string &iio_device_name, |
| const string &iio_sensor_name) { |
| base::FilePath iio_device_dir("/sys/bus/iio/devices/"); |
| base::FileEnumerator iio_enum(iio_device_dir, false, |
| base::FileEnumerator::DIRECTORIES, |
| FILE_PATH_LITERAL("iio:device*")); |
| |
| base::FilePath iio_device; |
| for (iio_device = iio_enum.Next(); !iio_device.empty(); |
| iio_device = iio_enum.Next()) { |
| if (iio_device.BaseName().value() == iio_device_name) { |
| break; |
| } |
| } |
| |
| if (iio_device.empty()) { |
| return NULL; |
| } |
| |
| return std::make_unique<IioTemperatureSensor>(name, iio_device, |
| iio_sensor_name); |
| } |
| |
| IioTemperatureSensor::IioTemperatureSensor(const string &name, |
| const base::FilePath &iio_dev_path, |
| const string &iio_sensor_name) |
| : TemperatureSensorCommon(name), |
| sysfs_attr_input_(iio_dev_path.value() + "/in_temp_" + iio_sensor_name) { |
| } |
| |
| bool IioTemperatureSensor::ReadTemperature(int *value) { |
| DCHECK(value); |
| |
| string contents; |
| if (!base::ReadFileToString(sysfs_attr_input_, &contents)) { |
| LOG(ERROR) << "[" << name() << "] Failed to read '" |
| << sysfs_attr_input_.value() << "'"; |
| return false; |
| } |
| |
| *value = stoi(contents); |
| |
| return true; |
| } |
| |
| } // namespace thermald |