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// Copyright 2014 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 "device/battery/battery_status_manager.h"
#include "base/memory/ref_counted.h"
#include "chromeos/dbus/dbus_thread_manager.h"
#include "chromeos/dbus/power_manager/power_supply_properties.pb.h"
#include "chromeos/dbus/power_manager_client.h"
namespace device {
namespace {
class PowerManagerObserver
: public chromeos::PowerManagerClient::Observer,
public base::RefCountedThreadSafe<PowerManagerObserver> {
public:
explicit PowerManagerObserver(
const BatteryStatusService::BatteryUpdateCallback& callback)
: callback_(callback), currently_listening_(false) {}
// Starts listening for updates.
void Start() {
if (currently_listening_)
return;
chromeos::PowerManagerClient* power_client =
chromeos::DBusThreadManager::Get()->GetPowerManagerClient();
power_client->AddObserver(this);
power_client->RequestStatusUpdate();
currently_listening_ = true;
}
// Stops listening for updates.
void Stop() {
if (!currently_listening_)
return;
chromeos::DBusThreadManager::Get()->GetPowerManagerClient()->RemoveObserver(
this);
currently_listening_ = false;
}
private:
friend class base::RefCountedThreadSafe<PowerManagerObserver>;
virtual ~PowerManagerObserver() {}
bool IsBatteryPresent(
const power_manager::PowerSupplyProperties& proto) const {
return proto.battery_state() !=
power_manager::PowerSupplyProperties_BatteryState_NOT_PRESENT;
}
bool IsUsbChargerConnected(
const power_manager::PowerSupplyProperties& proto) const {
return proto.external_power() ==
power_manager::PowerSupplyProperties_ExternalPower_USB;
}
bool IsBatteryCharging(
const power_manager::PowerSupplyProperties& proto) const {
return proto.battery_state() !=
power_manager::PowerSupplyProperties_BatteryState_DISCHARGING;
}
bool IsBatteryFull(const power_manager::PowerSupplyProperties& proto) const {
return proto.battery_state() ==
power_manager::PowerSupplyProperties_BatteryState_FULL;
}
double GetBatteryLevel(
const power_manager::PowerSupplyProperties& proto) const {
const double kMaxBatteryLevelProto = 100.f;
return proto.battery_percent() / kMaxBatteryLevelProto;
}
// chromeos::PowerManagerClient::Observer:
virtual void PowerChanged(
const power_manager::PowerSupplyProperties& proto) override {
BatteryStatus status;
// Use the default values if there is no battery in the system.
if (IsBatteryPresent(proto)) {
// The charging status is unreliable if a low power charger is connected
// (i.e. usb).
bool status_unreliable = IsUsbChargerConnected(proto);
// Battery time is unreliable if it is still being computed.
bool time_unreliable =
status_unreliable || proto.is_calculating_battery_time();
// Set |charging| only if the status is reliable. Otherwise, keep the
// default (which is |true|).
if (!status_unreliable)
status.charging = IsBatteryCharging(proto);
// Set |chargingTime| to +infinity if the battery is discharging, or if
// the time is unreliable. Keep the default value (which is 0) if the
// battery is full.
if (time_unreliable || !status.charging)
status.charging_time = std::numeric_limits<double>::infinity();
else if (!IsBatteryFull(proto))
status.charging_time = proto.battery_time_to_full_sec();
// Keep the default value for |dischargingTime| (which is +infinity) if
// the time is unreliable, or if the battery is charging.
if (!time_unreliable && !status.charging)
status.discharging_time = proto.battery_time_to_empty_sec();
status.level = GetBatteryLevel(proto);
}
callback_.Run(status);
}
BatteryStatusService::BatteryUpdateCallback callback_;
bool currently_listening_;
DISALLOW_COPY_AND_ASSIGN(PowerManagerObserver);
};
class BatteryStatusManagerChromeOS
: public BatteryStatusManager,
public chromeos::PowerManagerClient::Observer {
public:
explicit BatteryStatusManagerChromeOS(
const BatteryStatusService::BatteryUpdateCallback& callback)
: observer_(new PowerManagerObserver(callback)) {}
virtual ~BatteryStatusManagerChromeOS() { observer_->Stop(); }
private:
// BatteryStatusManager:
virtual bool StartListeningBatteryChange() override {
observer_->Start();
return true;
}
virtual void StopListeningBatteryChange() override {
observer_->Stop();
}
scoped_refptr<PowerManagerObserver> observer_;
DISALLOW_COPY_AND_ASSIGN(BatteryStatusManagerChromeOS);
};
} // namespace
// static
scoped_ptr<BatteryStatusManager> BatteryStatusManager::Create(
const BatteryStatusService::BatteryUpdateCallback& callback) {
return scoped_ptr<BatteryStatusManager>(
new BatteryStatusManagerChromeOS(callback));
}
} // namespace device
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