tlbmc/hal/sysfs/i2c.cc

#include "tlbmc/hal/sysfs/i2c.h"

#include <cstdint>
#include <string>

#include "absl/log/log.h"
#include "absl/strings/str_cat.h"
#include "boost/system/error_code.hpp"  // NOLINT
#include "hal_common_config.pb.h"

namespace milotic_tlbmc {

boost::filesystem::path I2cSysfs::GetBusPath(uint64_t bus) const {
  boost::filesystem::path path(config_.i2c_sysfs_path);
  path /= "i2c-";
  return absl::StrCat(path.string(), bus);
}

bool I2cSysfs::IsDevicePresent(const HalCommonConfig& config) const {
  boost::filesystem::path path = GetBusPath(config.bus());
  path /= GetDeviceDirectoryName(config);
  boost::system::error_code ec;
  bool exists = boost::filesystem::exists(path, ec);
  if (ec) {
    LOG(ERROR) << "Error checking exists for path '" << path
               << "': " << ec.message();
    return false;
  }
  return exists;
}

std::string I2cSysfs::GetDeviceDirectoryName(
    const HalCommonConfig& config) const {
  return absl::StrCat(config.bus(), "-",
                      absl::Hex(config.address(), absl::kZeroPad4));
}

}  // namespace milotic_tlbmc