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1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include "device/battery/battery_status_manager.h" | |
6 | |
7 #include <memory> | |
8 | |
9 #include "base/macros.h" | |
10 #include "base/memory/ref_counted.h" | |
11 #include "chromeos/dbus/dbus_thread_manager.h" | |
12 #include "chromeos/dbus/power_manager/power_supply_properties.pb.h" | |
13 #include "chromeos/dbus/power_manager_client.h" | |
14 | |
15 namespace device { | |
16 | |
17 namespace { | |
18 | |
19 class PowerManagerObserver | |
20 : public chromeos::PowerManagerClient::Observer, | |
21 public base::RefCountedThreadSafe<PowerManagerObserver> { | |
22 public: | |
23 explicit PowerManagerObserver( | |
24 const BatteryStatusService::BatteryUpdateCallback& callback) | |
25 : callback_(callback), currently_listening_(false) {} | |
26 | |
27 // Starts listening for updates. | |
28 void Start() { | |
29 if (currently_listening_) | |
30 return; | |
31 chromeos::PowerManagerClient* power_client = | |
32 chromeos::DBusThreadManager::Get()->GetPowerManagerClient(); | |
33 power_client->AddObserver(this); | |
34 power_client->RequestStatusUpdate(); | |
35 currently_listening_ = true; | |
36 } | |
37 | |
38 // Stops listening for updates. | |
39 void Stop() { | |
40 if (!currently_listening_) | |
41 return; | |
42 chromeos::DBusThreadManager::Get()->GetPowerManagerClient()->RemoveObserver( | |
43 this); | |
44 currently_listening_ = false; | |
45 } | |
46 | |
47 private: | |
48 friend class base::RefCountedThreadSafe<PowerManagerObserver>; | |
49 | |
50 ~PowerManagerObserver() override {} | |
51 | |
52 bool IsBatteryPresent( | |
53 const power_manager::PowerSupplyProperties& proto) const { | |
54 return proto.battery_state() != | |
55 power_manager::PowerSupplyProperties_BatteryState_NOT_PRESENT; | |
56 } | |
57 | |
58 bool IsUsbChargerConnected( | |
59 const power_manager::PowerSupplyProperties& proto) const { | |
60 return proto.external_power() == | |
61 power_manager::PowerSupplyProperties_ExternalPower_USB; | |
62 } | |
63 | |
64 bool IsBatteryCharging( | |
65 const power_manager::PowerSupplyProperties& proto) const { | |
66 return proto.battery_state() != | |
67 power_manager::PowerSupplyProperties_BatteryState_DISCHARGING; | |
68 } | |
69 | |
70 bool IsBatteryFull(const power_manager::PowerSupplyProperties& proto) const { | |
71 return proto.battery_state() == | |
72 power_manager::PowerSupplyProperties_BatteryState_FULL; | |
73 } | |
74 | |
75 double GetBatteryLevel( | |
76 const power_manager::PowerSupplyProperties& proto) const { | |
77 const double kMaxBatteryLevelProto = 100.f; | |
78 return proto.battery_percent() / kMaxBatteryLevelProto; | |
79 } | |
80 | |
81 // chromeos::PowerManagerClient::Observer: | |
82 void PowerChanged( | |
83 const power_manager::PowerSupplyProperties& proto) override { | |
84 mojom::BatteryStatus status; | |
85 | |
86 // Use the default values if there is no battery in the system. | |
87 if (IsBatteryPresent(proto)) { | |
88 // The charging status is unreliable if a low power charger is connected | |
89 // (i.e. usb). | |
90 bool status_unreliable = IsUsbChargerConnected(proto); | |
91 // Battery time is unreliable if it is still being computed. | |
92 bool time_unreliable = | |
93 status_unreliable || proto.is_calculating_battery_time(); | |
94 | |
95 // Set |charging| only if the status is reliable. Otherwise, keep the | |
96 // default (which is |true|). | |
97 if (!status_unreliable) | |
98 status.charging = IsBatteryCharging(proto); | |
99 | |
100 // Set |chargingTime| to +infinity if the battery is discharging, or if | |
101 // the time is unreliable. Keep the default value (which is 0) if the | |
102 // battery is full. | |
103 if (time_unreliable || !status.charging) | |
104 status.charging_time = std::numeric_limits<double>::infinity(); | |
105 else if (!IsBatteryFull(proto)) | |
106 status.charging_time = proto.battery_time_to_full_sec(); | |
107 | |
108 // Keep the default value for |dischargingTime| (which is +infinity) if | |
109 // the time is unreliable, or if the battery is charging. | |
110 if (!time_unreliable && !status.charging) | |
111 status.discharging_time = proto.battery_time_to_empty_sec(); | |
112 | |
113 status.level = GetBatteryLevel(proto); | |
114 } | |
115 callback_.Run(status); | |
116 } | |
117 | |
118 BatteryStatusService::BatteryUpdateCallback callback_; | |
119 bool currently_listening_; | |
120 | |
121 DISALLOW_COPY_AND_ASSIGN(PowerManagerObserver); | |
122 }; | |
123 | |
124 class BatteryStatusManagerChromeOS | |
125 : public BatteryStatusManager, | |
126 public chromeos::PowerManagerClient::Observer { | |
127 public: | |
128 explicit BatteryStatusManagerChromeOS( | |
129 const BatteryStatusService::BatteryUpdateCallback& callback) | |
130 : observer_(new PowerManagerObserver(callback)) {} | |
131 | |
132 ~BatteryStatusManagerChromeOS() override { observer_->Stop(); } | |
133 | |
134 private: | |
135 // BatteryStatusManager: | |
136 bool StartListeningBatteryChange() override { | |
137 observer_->Start(); | |
138 return true; | |
139 } | |
140 | |
141 void StopListeningBatteryChange() override { observer_->Stop(); } | |
142 | |
143 scoped_refptr<PowerManagerObserver> observer_; | |
144 | |
145 DISALLOW_COPY_AND_ASSIGN(BatteryStatusManagerChromeOS); | |
146 }; | |
147 | |
148 } // namespace | |
149 | |
150 // static | |
151 std::unique_ptr<BatteryStatusManager> BatteryStatusManager::Create( | |
152 const BatteryStatusService::BatteryUpdateCallback& callback) { | |
153 return std::unique_ptr<BatteryStatusManager>( | |
154 new BatteryStatusManagerChromeOS(callback)); | |
155 } | |
156 | |
157 } // namespace device | |
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