Android 12 WiFi开启流程
/* ActiveModeWarden
* / \
* / \
* ConcreteClientModeManager DefaultClientModeManager
* (Client Mode + Scan Only Mode) (Wifi off)
* / \
* / \
* ClientModeImpl ScanOnlyModeImpl
*/
一、startHal
packages/apps/Settings/src/com/android/settings/wifi/WifiEnabler.java
frameworks/base/wifi/java/android/net/wifi/WifiManager.java
packages/modules/Wifi/service/java/com/android/server/wifi/WifiServiceImpl.java
packages/modules/Wifi/service/java/com/android/server/wifi/ActiveModeWarden.java
packages/modules/Wifi/service/java/com/android/server/wifi/ConcreteClientModeManager.java
packages/modules/Wifi/service/java/com/android/server/wifi/WifiNative.java
packages/modules/Wifi/service/java/com/android/server/wifi/WifiVendorHal.java
packages/modules/Wifi/service/java/com/android/server/wifi/HalDeviceManager.java
WifiEnabler.java ->mWifiManager.setWifiEnabled(isChecked)
---->WifiManager.java =>setWifiEnabled(boolean enabled)
--------->WifiServiceImpl.java =>setWifiEnabled(String packageName, boolean enable): mActiveModeWarden.wifiToggled(new WorkSource(Binder.getCallingUid(), packageName));
-------------->ActiveModeWarden.java =>wifiToggled(WorkSource requestorWs): mWifiController.sendMessage(WifiController.CMD_WIFI_TOGGLED, requestorWs);//发送CMD_WIFI_TOGGLED消息到EnabledState中
-->ActiveModeWarden$DisabledState
->processMessageFiltered(Message msg)
-->case CMD_WIFI_TOGGLED
handleStaToggleChangeInDisabledState((WorkSource) msg.obj);;//接收到CMD_WIFI_TOGGLED消息
-->handleStaToggleChangeInDisabledState((WorkSource) msg.obj):
startPrimaryOrScanOnlyClientModeManager(requestorWs);
transitionTo(mEnabledState);//将状态切换到EnabledState
-->startPrimaryOrScanOnlyClientModeManager(WorkSource requestorWs):
->if (role == ROLE_CLIENT_PRIMARY)
return startPrimaryClientModeManager(requestorWs);
->else if
return startScanOnlyClientModeManager(requestorWs);
->else
return false;
-->startPrimaryClientModeManager(WorkSource requestorWs):
ConcreteClientModeManager manager = mWifiInjector.makeClientModeManager(new ClientListener(), requestorWs, ROLE_CLIENT_PRIMARY, mVerboseLoggingEnabled);//创建对象
mClientModeManagers.add(manager);//加入到ConcreteClientModeManager列表集合中
------------------->ConcreteClientModeManager.java =>mStateMachine.sendMessage(ClientModeStateMachine.CMD_START, mTargetRoleChangeInfo);//在构造方法里发送CMD_START消息
-->ConcreteClientModeManager$IdleState->processMessage(Message message)
--->case CMD_START//接收CMD_START消息
mClientInterfaceName = mWifiNative.setupInterfaceForClientInScanMode( mWifiNativeInterfaceCallback, roleChangeInfo.requestorWs);
----------------------->WifiNative.java =>setupInterfaceForClientInScanMode(@NonNull InterfaceCallback interfaceCallback, @NonNull WorkSource requestorWs):startHal()
->startHal():mWifiVendorHal.startVendorHal()//开启vendor Hal
--------------------------->WifiVendorHal.java =>startVendorHal():mHalDeviceManager.start()
------------------------------->HalDeviceManager.java =>start():startWifi()
-->startWifi():
-> WifiStatus status = mWifi.start();//启动实际加载WiFi动作的调用，涉及HIDL机制调用hardware/interfaces/wifi/1.5/IWifi.hal//编译的时候会生成IWifi.java中间文件，通过Binder调用到wifi.cpp中
hardware/interfaces/wifi/1.5/default/wifi.cpp
hardware/interfaces/wifi/1.5/default/wifi_mode_controller.cpp
frameworks/opt/net/wifi/libwifi_hal/driver_tool.cpp
frameworks/opt/net/wifi/libwifi_hal/wifi_hal_common.cpp
wifi.cpp =>Return Wifi::start(start_cb hidl_status_cb) => return validateAndCall(this, WifiStatusCode::ERROR_UNKNOWN,&Wifi::startInternal, hidl_status_cb);
==> WifiStatus Wifi::startInternal() => WifiStatus wifi_status = initializeModeControllerAndLegacyHal();
==> WifiStatus Wifi::initializeModeControllerAndLegacyHal() => legacy_hal::wifi_error legacy_status = hal->initialize()
---->wifi_mode_controller.cpp =>bool WifiModeController::initialize() => driver_tool_->LoadDriver()
-------->driver_tool.cpp => bool DriverTool::LoadDriver()//加载wifi驱动
------------->wifi_hal_common.cpp => int wifi_load_driver() =>insmod(DRIVER_MODULE_PATH, DRIVER_MODULE_ARG)//处理完成CMD_START消息，状态机将执行IdleState.exit()->StartedState.enter()->StartedState.exit()->ScanOnlyModeState.enter() 二、启动supplicant
-------------->ActiveModeWarden.java =>ActiveModeWarden$EnabledState
-->processMessageFiltered(Message msg)
->case CMD_WIFI_TOGGLED
handleStaToggleChangeInEnabledState((WorkSource) msg.obj);
-->handleStaToggleChangeInEnabledState(WorkSource requestorWs):
->if (shouldEnableSta())
-->if (hasAnyClientModeManager())
switchAllPrimaryOrScanOnlyClientModeManagers();
-->else
startPrimaryOrScanOnlyClientModeManager(requestorWs);
->else
stopAllClientModeManagers();
-->switchAllPrimaryOrScanOnlyClientModeManagers():switchPrimaryOrScanOnlyClientModeManagerRole(clientModeManager)
-->switchPrimaryOrScanOnlyClientModeManagerRole(@NonNull ConcreteClientModeManager modeManager):
->modeManager.setRole(role, lastRequestorWs);
------------------>ConcreteClientModeManager.java =>setRole(@NonNull ClientRole role, @NonNull WorkSource requestorWs):setRole(role, requestorWs, null);
->setRole(@NonNull ClientRole role, @NonNull WorkSource requestorWs,@Nullable Listener modeListener):
-->if (role == ROLE_CLIENT_SCAN_ONLY)
mStateMachine.sendMessage(ClientModeStateMachine.CMD_SWITCH_TO_SCAN_ONLY_MODE);
-->else
mStateMachine.sendMessage(ClientModeStateMachine.CMD_SWITCH_TO_CONNECT_MODE,mTargetRoleChangeInfo);
-->ConcreteClientModeManager$StartedState->processMessage(Message message):
->case CMD_SWITCH_TO_CONNECT_MODE
mWifiNative.switchClientInterfaceToConnectivityMode(mClientInterfaceName, roleChangeInfo.requestorWs);
transitionTo(mConnectModeState);//将状态切换到connectmodestate
---------------------->WifiNative.java =>switchClientInterfaceToConnectivityMode(@NonNull String ifaceName,@NonNull WorkSource requestorWs):startSupplicant()
-->startSupplicant():startAndWaitForSupplicantConnection()
-->startAndWaitForSupplicantConnection():
mSupplicantStaIfaceHal.initialize();
mSupplicantStaIfaceHal.startDaemon();
-------------------------->SupplicantStaIfaceHal.java => startDaemon():
-->if (isV1_1())
Log.i(TAG, "Starting supplicant using HIDL");
return startDaemon_V1_1();
-->else
Log.i(TAG, "Starting supplicant using init");
return mFrameworkFacade.startSupplicant();
-->startDaemon_V1_1():getSupplicantMockableV1_1();
-->getSupplicantMockableV1_1()//通过HIDL来打开supplicant
//注册wpa_supplicant：main.c ==> wpa_supplicant.c->wpa_supplicant_init() ==> notify.c->wpas_notify_supplicant_initialized() ==> hidl.cpp->wpas_hidl_init() ==> Hidl_manager.cpp->registerHidlService()