base/power_monitor/power_monitor_source.cc

// Copyright 2013 The Chromium 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 "base/power_monitor/power_monitor_source.h"

#include "base/power_monitor/power_monitor.h"
#include "build/build_config.h"

namespace base {

PowerMonitorSource::PowerMonitorSource() = default;
PowerMonitorSource::~PowerMonitorSource() = default;

bool PowerMonitorSource::IsOnBatteryPower() {
  AutoLock auto_lock(battery_lock_);
  return on_battery_power_;
}

PowerObserver::DeviceThermalState PowerMonitorSource::GetCurrentThermalState() {
  return PowerObserver::DeviceThermalState::kUnknown;
}

#if defined(OS_ANDROID)
int PowerMonitorSource::GetRemainingBatteryCapacity() {
  return 0;
}
#endif  // defined(OS_ANDROID)

// static
void PowerMonitorSource::ProcessPowerEvent(PowerEvent event_id) {
  if (!PowerMonitor::IsInitialized())
    return;

  PowerMonitorSource* source = PowerMonitor::Source();

  // Suppress duplicate notifications.  Some platforms may
  // send multiple notifications of the same event.
  switch (event_id) {
    case POWER_STATE_EVENT:
      {
        bool new_on_battery_power = source->IsOnBatteryPowerImpl();
        bool changed = false;

        {
          AutoLock auto_lock(source->battery_lock_);
          if (source->on_battery_power_ != new_on_battery_power) {
              changed = true;
              source->on_battery_power_ = new_on_battery_power;
          }
        }

        if (changed)
          PowerMonitor::NotifyPowerStateChange(new_on_battery_power);
      }
      break;
    case RESUME_EVENT:
      if (source->suspended_) {
        source->suspended_ = false;
        PowerMonitor::NotifyResume();
      }
      break;
    case SUSPEND_EVENT:
      if (!source->suspended_) {
        source->suspended_ = true;
        PowerMonitor::NotifySuspend();
      }
      break;
  }
}

// static
void PowerMonitorSource::ProcessThermalEvent(
    PowerObserver::DeviceThermalState new_thermal_state) {
  if (!PowerMonitor::IsInitialized())
    return;
  PowerMonitor::NotifyThermalStateChange(new_thermal_state);
}

void PowerMonitorSource::SetInitialOnBatteryPowerState(bool on_battery_power) {
  // Must only be called before an initialized PowerMonitor exists, otherwise
  // the caller should have just used a normal
  // ProcessPowerEvent(POWER_STATE_EVENT) call.
  DCHECK(!PowerMonitor::Source());
  AutoLock auto_lock(battery_lock_);
  on_battery_power_ = on_battery_power;
}

// static
const char* PowerMonitorSource::DeviceThermalStateToString(
    PowerObserver::DeviceThermalState state) {
  switch (state) {
    case PowerObserver::DeviceThermalState::kUnknown:
      return "Unknown";
    case PowerObserver::DeviceThermalState::kNominal:
      return "Nominal";
    case PowerObserver::DeviceThermalState::kFair:
      return "Fair";
    case PowerObserver::DeviceThermalState::kSerious:
      return "Serious";
    case PowerObserver::DeviceThermalState::kCritical:
      return "Critical";
  }
  NOTREACHED();
  return "Unknown";
}

}  // namespace base