power_manager/powerd/system/wakeup_device_interface.h

// Copyright 2018 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 POWER_MANAGER_POWERD_SYSTEM_WAKEUP_DEVICE_INTERFACE_H_
#define POWER_MANAGER_POWERD_SYSTEM_WAKEUP_DEVICE_INTERFACE_H_

#include <memory>

#include <base/files/file_path.h>

namespace power_manager {
namespace system {

// Per device object that helps in identifying if this device is one of the
// reasons for last wake.
class WakeupDeviceInterface {
 public:
  WakeupDeviceInterface() {}
  WakeupDeviceInterface(const WakeupDeviceInterface&) = delete;
  WakeupDeviceInterface& operator=(const WakeupDeviceInterface&) = delete;

  virtual ~WakeupDeviceInterface() {}

  // Records wakeup_count before suspending to identify if the
  // device woke up the system after resume.
  virtual void PrepareForSuspend() = 0;

  // Reads wakeup_count after resume and compares it to the wakeup_count
  // before suspending.
  virtual void HandleResume() = 0;

  // Returns true if the wakeup_count changed during last suspend/resume cycle.
  virtual bool CausedLastWake() const = 0;
};

}  // namespace system
}  // namespace power_manager

#endif  // POWER_MANAGER_POWERD_SYSTEM_WAKEUP_DEVICE_INTERFACE_H_