Android Wifi software layers
//based on Android2.3 QCom MSM7227A AR6003-v806 source.learning by wifi sta enabling
Load driver:
[*]com.android.server.WifiService.setWifiEnabled(true)
[*]android.net.wifi.WifiStateTracker.loadDriver()
[*]hardware/libhardware_legacy/wifi/wifi.c: wifi_load_driver()
[*]start init service "init.svc.wlan_tool" with parameter "load" to load driver
[*]check value ofproperty wlan.driver.status to make sure driver is loaded
[*]check /init.rc. service wlan_tool: /system/bin/wlan_tool :system/wlan/atheros/AR6kSDK.build_3.1_RC.806/host/tools/wlan_tool/wlan_tool. it is a linux shell script
[*]it is a onshot service
[*]loaddriver():reload():do_insmod():insmod /system/wifi/ar6000.ko
Start supplicant:
[*]see "Load driver" step 1
[*]see "Load driver" step 2
[*]see "Load driver" step 3
[*]check /init.rc. service "wpa_supplicant" : /system/bin/wpa_supplicant -Dwext -iwlan0 -c/data/misc/wifi/wpa_supplicant.conf
[*]wpa_supplicant now running.
Connect to wpa_supplicant and monitor wifi states:
[*]android.net.wifi.WifiStateTracker.startEventLoop()
[*]android.net.wifi.WifiMonitor.MonitorThread.run()
[*]MonitorThread.connectToSupplicant()
[*]hardware/libhardware_legacy/wifi/wifi.c:wifi_connect_to_supplicant():wpa_ctrl_open()
[*]MonitorThread.handleSupplicantStateChange():MonitorThread.handleDriverEvent()
[*]if driver state change to "STARTED", start scan:andorid.net.wifi.WifiStateTracker.scan()
Scan AP:
[*]andorid.net.wifi.WifiStateTracker.scan()
[*]android.net.wifi.WifiStateTracker.android_net_wifi_scanCommand():
[*]doCommand("DRIVER SCAN-ACTIVE");
[*]doCommand("SCAN")
[*]hardware/libhardware_legacy/wifi/wifi.c:wifi_send_command()
[*]wpa_ctrl_request
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