rmad/utils/cbi_utils_impl.cc

// Copyright 2021 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 "rmad/utils/cbi_utils_impl.h"

#include <string>
#include <vector>

#include <base/logging.h>
#include <base/process/launch.h>
#include <base/strings/string_number_conversions.h>
#include <base/strings/string_util.h>
#include <re2/re2.h>

namespace rmad {

constexpr char kEctoolCmdPath[] = "/usr/sbin/ectool";
constexpr char kEctoolIntValRegex[] = R"(As uint: (\d+))";

bool CbiUtilsImpl::SetCbi(int tag, const std::string& value, int set_flag) {
  std::vector<std::string> argv{kEctoolCmdPath,
                                "cbi",
                                "set",
                                base::NumberToString(tag),
                                value,
                                "0",
                                base::NumberToString(set_flag)};
  static std::string unused_output;
  return base::GetAppOutput(argv, &unused_output);
}

bool CbiUtilsImpl::GetCbi(int tag, std::string* value, int get_flag) const {
  CHECK(value != nullptr);

  std::vector<std::string> argv{kEctoolCmdPath, "cbi", "get",
                                base::NumberToString(tag),
                                base::NumberToString(get_flag)};
  if (!base::GetAppOutput(argv, value)) {
    return false;
  }

  base::TrimWhitespaceASCII(*value, base::TRIM_TRAILING, value);
  return true;
}

bool CbiUtilsImpl::SetCbi(int tag, uint64_t value, int size, int set_flag) {
  CHECK_GE(size, 1);
  CHECK_LE(size, 8);
  CHECK(size == 8 || 1 << (size * 8) > value);

  std::vector<std::string> argv{kEctoolCmdPath,
                                "cbi",
                                "set",
                                base::NumberToString(tag),
                                base::NumberToString(value),
                                base::NumberToString(size),
                                base::NumberToString(set_flag)};
  static std::string unused_output;
  return base::GetAppOutput(argv, &unused_output);
}

bool CbiUtilsImpl::GetCbi(int tag, uint64_t* value, int get_flag) const {
  CHECK(value != nullptr);

  std::vector<std::string> argv{kEctoolCmdPath, "cbi", "get",
                                base::NumberToString(tag),
                                base::NumberToString(get_flag)};
  std::string output;
  if (!base::GetAppOutput(argv, &output)) {
    return false;
  }

  if (!re2::RE2::PartialMatch(output, kEctoolIntValRegex, value)) {
    LOG(ERROR) << "Failed to parse output from ectool";
    return false;
  }

  return true;
}

}  // namespace rmad