tlbmc/hal/sysfs/hwmon.cc

#include "tlbmc/hal/sysfs/hwmon.h"

#include <fstream>
#include <string_view>

#include "absl/status/status.h"
#include "absl/strings/str_cat.h"
#include "hal_common_config.pb.h"

namespace milotic_tlbmc {

absl::Status HwmonSysfs::NewDevice(const HalCommonConfig& config,
                                   std::string_view driver_name) const {
  if (IsDevicePresent(config)) {
    return absl::AlreadyExistsError(
        absl::StrCat("Device ", config, " already exists"));
  }

  boost::filesystem::path path = GetBusPath(config.bus()) / "new_device";

  std::ofstream file(path.string());
  if (!file.good()) {
    return absl::InternalError(absl::StrCat("Failed to open ", path.string()));
  }

  file << driver_name << " " << config.address() << "\n";
  file.flush();

  if (!file.good()) {
    return absl::InternalError(
        absl::StrCat("Failed to write to ", path.string()));
  }

  return absl::OkStatus();
}

absl::Status HwmonSysfs::DeleteDevice(const HalCommonConfig& config) const {
  // No `IsDevicePresent` check on this like in `NewDevice`, since it
  // might be used to clean up after a device instantiation that was only
  // partially successful

  boost::filesystem::path path = GetBusPath(config.bus()) / "delete_device";
  std::ofstream file(path.string());
  if (!file.good()) {
    return absl::InternalError(absl::StrCat("Failed to open ", path.string()));
  }
  file << config.address() << "\n";
  file.flush();
  if (!file.good()) {
    return absl::InternalError(
        absl::StrCat("Failed to write to ", path.string()));
  }
  return absl::OkStatus();
}

}  // namespace milotic_tlbmc