runtime_probe/functions/edid.h

/* Copyright 2020 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.
 */
#ifndef RUNTIME_PROBE_FUNCTIONS_EDID_H_
#define RUNTIME_PROBE_FUNCTIONS_EDID_H_

#include <memory>
#include <string>
#include <vector>

#include <base/files/file_path.h>

#include "runtime_probe/probe_function.h"

namespace runtime_probe {

/* Parse EDID files from DRM devices in sysfs.
 *
 * @param dir_path a list of paths to be evaluated. (Default:
 * {"/sys/class/drm/<wildcard>"})
 */
class EdidFunction : public ProbeFunction {
 public:
  static constexpr auto function_name = "edid";
  std::string GetFunctionName() const override { return function_name; }

  static std::unique_ptr<ProbeFunction> FromValue(
      const base::Value& dict_value);

  /* Override `Eval` function, which should return a list of Value */
  DataType Eval() const override;

  int EvalInHelper(std::string* output) const override;

 private:
  /* The path of target sysfs device, the last component can contain '*' */
  std::vector<std::string> dir_path_;

  std::vector<base::FilePath> GetEdidPaths(
      const base::FilePath& glob_path) const;
  base::Value EvalInHelperByPath(const base::FilePath& node_path) const;
  static ProbeFunction::Register<EdidFunction> register_;
};

/* Register the EdidFunction */
REGISTER_PROBE_FUNCTION(EdidFunction);

}  // namespace runtime_probe

#endif  // RUNTIME_PROBE_FUNCTIONS_EDID_H_