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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_win.h" | |
| 6 | |
| 7 #include <memory> | |
| 8 | |
| 9 #include "base/bind.h" | |
| 10 #include "base/macros.h" | |
| 11 #include "base/metrics/histogram_macros.h" | |
| 12 #include "base/strings/string16.h" | |
| 13 #include "base/win/message_window.h" | |
| 14 #include "base/win/windows_version.h" | |
| 15 #include "device/battery/battery_status_manager.h" | |
| 16 | |
| 17 namespace device { | |
| 18 | |
| 19 namespace { | |
| 20 | |
| 21 typedef BatteryStatusService::BatteryUpdateCallback BatteryCallback; | |
| 22 | |
| 23 const wchar_t kWindowClassName[] = L"BatteryStatusMessageWindow"; | |
| 24 | |
| 25 // This enum is used for histogram. Don't change the order of the existing | |
| 26 // values. | |
| 27 enum NumberBatteriesType { | |
| 28 UNKNOWN_BATTERIES = 0, | |
| 29 NO_BATTERY = 1, | |
| 30 ONE_OR_MORE_BATTERIES = 2, | |
| 31 BATTERY_TYPES_COUNT = 3, | |
| 32 }; | |
| 33 | |
| 34 void UpdateNumberBatteriesHistogram(NumberBatteriesType count) { | |
| 35 UMA_HISTOGRAM_ENUMERATION("BatteryStatus.NumberBatteriesWin", | |
| 36 count, | |
| 37 BATTERY_TYPES_COUNT); | |
| 38 } | |
| 39 | |
| 40 void UpdateNumberBatteriesHistogram() { | |
| 41 SYSTEM_POWER_STATUS win_status; | |
| 42 if (!GetSystemPowerStatus(&win_status)) { | |
| 43 UpdateNumberBatteriesHistogram(UNKNOWN_BATTERIES); | |
| 44 return; | |
| 45 } | |
| 46 | |
| 47 if (win_status.BatteryFlag == 255) | |
| 48 UpdateNumberBatteriesHistogram(UNKNOWN_BATTERIES); | |
| 49 else if (win_status.BatteryFlag == 128) | |
| 50 UpdateNumberBatteriesHistogram(NO_BATTERY); | |
| 51 else | |
| 52 UpdateNumberBatteriesHistogram(ONE_OR_MORE_BATTERIES); | |
| 53 } | |
| 54 | |
| 55 // Message-only window for handling battery changes on Windows. | |
| 56 class BatteryStatusObserver { | |
| 57 public: | |
| 58 explicit BatteryStatusObserver(const BatteryCallback& callback) | |
| 59 : power_handle_(NULL), | |
| 60 battery_change_handle_(NULL), | |
| 61 callback_(callback) { | |
| 62 } | |
| 63 | |
| 64 ~BatteryStatusObserver() { DCHECK(!window_); } | |
| 65 | |
| 66 void Start() { | |
| 67 if (CreateMessageWindow()) { | |
| 68 BatteryChanged(); | |
| 69 // RegisterPowerSettingNotification function work from Windows Vista | |
| 70 // onwards. However even without them we will receive notifications, | |
| 71 // e.g. when a power source is connected. | |
| 72 // TODO(timvolodine) : consider polling for battery changes on windows | |
| 73 // versions prior to Vista, see crbug.com/402466. | |
| 74 power_handle_ = | |
| 75 RegisterNotification(&GUID_ACDC_POWER_SOURCE); | |
| 76 battery_change_handle_ = | |
| 77 RegisterNotification(&GUID_BATTERY_PERCENTAGE_REMAINING); | |
| 78 } else { | |
| 79 // Could not create a message window, execute callback with the default | |
| 80 // values. | |
| 81 callback_.Run(mojom::BatteryStatus()); | |
| 82 } | |
| 83 | |
| 84 UpdateNumberBatteriesHistogram(); | |
| 85 } | |
| 86 | |
| 87 void Stop() { | |
| 88 if (power_handle_) { | |
| 89 UnregisterNotification(power_handle_); | |
| 90 power_handle_ = NULL; | |
| 91 } | |
| 92 if (battery_change_handle_) { | |
| 93 UnregisterNotification(battery_change_handle_); | |
| 94 battery_change_handle_ = NULL; | |
| 95 } | |
| 96 window_.reset(); | |
| 97 } | |
| 98 | |
| 99 private: | |
| 100 void BatteryChanged() { | |
| 101 SYSTEM_POWER_STATUS win_status; | |
| 102 if (GetSystemPowerStatus(&win_status)) | |
| 103 callback_.Run(ComputeWebBatteryStatus(win_status)); | |
| 104 else | |
| 105 callback_.Run(mojom::BatteryStatus()); | |
| 106 } | |
| 107 | |
| 108 bool HandleMessage(UINT message, | |
| 109 WPARAM wparam, | |
| 110 LPARAM lparam, | |
| 111 LRESULT* result) { | |
| 112 switch(message) { | |
| 113 case WM_POWERBROADCAST: | |
| 114 if (wparam == PBT_APMPOWERSTATUSCHANGE || | |
| 115 wparam == PBT_POWERSETTINGCHANGE) { | |
| 116 BatteryChanged(); | |
| 117 } | |
| 118 *result = NULL; | |
| 119 return true; | |
| 120 default: | |
| 121 return false; | |
| 122 } | |
| 123 } | |
| 124 | |
| 125 HPOWERNOTIFY RegisterNotification(LPCGUID power_setting) { | |
| 126 if (base::win::GetVersion() < base::win::VERSION_VISTA) | |
| 127 return NULL; | |
| 128 | |
| 129 return RegisterPowerSettingNotification(window_->hwnd(), power_setting, | |
| 130 DEVICE_NOTIFY_WINDOW_HANDLE); | |
| 131 } | |
| 132 | |
| 133 BOOL UnregisterNotification(HPOWERNOTIFY handle) { | |
| 134 if (base::win::GetVersion() < base::win::VERSION_VISTA) | |
| 135 return FALSE; | |
| 136 | |
| 137 return UnregisterPowerSettingNotification(handle); | |
| 138 } | |
| 139 | |
| 140 bool CreateMessageWindow() { | |
| 141 // TODO(timvolodine): consider reusing the message window of PowerMonitor. | |
| 142 window_.reset(new base::win::MessageWindow()); | |
| 143 if (!window_->CreateNamed(base::Bind(&BatteryStatusObserver::HandleMessage, | |
| 144 base::Unretained(this)), | |
| 145 base::string16(kWindowClassName))) { | |
| 146 LOG(ERROR) << "Failed to create message window: " << kWindowClassName; | |
| 147 window_.reset(); | |
| 148 return false; | |
| 149 } | |
| 150 return true; | |
| 151 } | |
| 152 | |
| 153 HPOWERNOTIFY power_handle_; | |
| 154 HPOWERNOTIFY battery_change_handle_; | |
| 155 BatteryCallback callback_; | |
| 156 std::unique_ptr<base::win::MessageWindow> window_; | |
| 157 | |
| 158 DISALLOW_COPY_AND_ASSIGN(BatteryStatusObserver); | |
| 159 }; | |
| 160 | |
| 161 class BatteryStatusManagerWin : public BatteryStatusManager { | |
| 162 public: | |
| 163 explicit BatteryStatusManagerWin(const BatteryCallback& callback) | |
| 164 : battery_observer_(new BatteryStatusObserver(callback)) {} | |
| 165 ~BatteryStatusManagerWin() override { battery_observer_->Stop(); } | |
| 166 | |
| 167 public: | |
| 168 // BatteryStatusManager: | |
| 169 bool StartListeningBatteryChange() override { | |
| 170 battery_observer_->Start(); | |
| 171 return true; | |
| 172 } | |
| 173 | |
| 174 void StopListeningBatteryChange() override { battery_observer_->Stop(); } | |
| 175 | |
| 176 private: | |
| 177 std::unique_ptr<BatteryStatusObserver> battery_observer_; | |
| 178 | |
| 179 DISALLOW_COPY_AND_ASSIGN(BatteryStatusManagerWin); | |
| 180 }; | |
| 181 | |
| 182 } // namespace | |
| 183 | |
| 184 mojom::BatteryStatus ComputeWebBatteryStatus( | |
| 185 const SYSTEM_POWER_STATUS& win_status) { | |
| 186 mojom::BatteryStatus status; | |
| 187 status.charging = win_status.ACLineStatus != WIN_AC_LINE_STATUS_OFFLINE; | |
| 188 | |
| 189 // Set level if available. Otherwise keep the default value which is 1. | |
| 190 if (win_status.BatteryLifePercent != 255) { | |
| 191 // Convert percentage to a value between 0 and 1 with 2 significant digits. | |
| 192 status.level = static_cast<double>(win_status.BatteryLifePercent) / 100.; | |
| 193 } | |
| 194 | |
| 195 if (!status.charging) { | |
| 196 // Set discharging_time if available otherwise keep the default value, | |
| 197 // which is +Infinity. | |
| 198 if (win_status.BatteryLifeTime != (DWORD)-1) | |
| 199 status.discharging_time = win_status.BatteryLifeTime; | |
| 200 status.charging_time = std::numeric_limits<double>::infinity(); | |
| 201 } else { | |
| 202 // Set charging_time to +Infinity if not fully charged, otherwise leave the | |
| 203 // default value, which is 0. | |
| 204 if (status.level < 1) | |
| 205 status.charging_time = std::numeric_limits<double>::infinity(); | |
| 206 } | |
| 207 return status; | |
| 208 } | |
| 209 | |
| 210 // static | |
| 211 std::unique_ptr<BatteryStatusManager> BatteryStatusManager::Create( | |
| 212 const BatteryStatusService::BatteryUpdateCallback& callback) { | |
| 213 return std::unique_ptr<BatteryStatusManager>( | |
| 214 new BatteryStatusManagerWin(callback)); | |
| 215 } | |
| 216 | |
| 217 } // namespace device | |
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Chromium Code Reviews
Issue 2818673003:
[DeviceService] Expose battery monitoring solely via the Device Service (Closed)
