Android Wifi 相关记录
Android Wifi子系统架构http://blog.iyunv.com/seker_xinjian/article/details/6254609
1. Ecp1015 无线网卡为BCM80211,使用kernel中自带driver: brcm80211.
在kernel中使能brcm80211
在device/asus/epc1015/epc1015_defconfig中添加
CONFIG_STAGING_EXCLUDE_BUILD=n
CONFIG_BRCM80211=m
CONFIG_BRCM80211_PCI=y
重新编译内核，生成brcm80211.ko
[*]在device/asus/epc1015/device.mk中添加brcm80211的firmware:
# add for wifi firmware
PRODUCT_COPY_FILES += device/asus/epc1015/firmware/bcm43xx-0.fw:system/etc/firmware/brcm/bcm43xx-0.fw
PRODUCT_COPY_FILES += device/asus/epc1015/firmware/bcm43xx_hdr-0.fw:system/etc/firmware/brcm/bcm43xx_hdr-0.fw
PRODUCT_COPY_FILES += device/asus/epc1015/firmware/bcm43xx_hdr-0.fw:system/lib/firmware/brcm/bcm43xx_hdr-0.fw
PRODUCT_COPY_FILES += device/asus/epc1015/firmware/bcm43xx-0.fw:system/lib/firmware/brcm/bcm43xx-0.fw
chown system system /sys/devices/platform/eeepc-wmi/wlan
经调试发现，系统启动时会加载驱动，在/system/lib/firmware中寻找firmware,如果没有，则会造成系统在这一步的时候卡一段时间。在启动后，打开/关闭wifi时，会在/system/etc/firmware/下寻找。所以，在这两个位置都加上bcm*.fw.
[*]向系统添加dhcp服务：
在device/asus/epc1015/init.epc1015.rc中添加
service dhcpcd_wlan0 /system/bin/dhcpcd -o domain_name_servers -ABKL
disabled
oneshot
service dhcpcd_eth0 /system/bin/dhcpcd -o domain_name_servers -ABKL
disabled
oneshot
service iprenew_wlan0 /system/bin/dhcpcd -o domain_name_servers -ABKL
disabled
oneshot
service iprenew_eth0 /system/bin/dhcpcd -o domain_name_servers -ABKL
disabled
oneshot
[*]启动时加载driver:向device/asus/epc1015/init.epc1015.sh中添加
modprobe ssb
modprobe cfg80211
modprobe mac80211
#WIFI
WIFIMOD=brcm80211
lsmod | grep $WIFIMOD
if [ $? -eq 0 ]; then
rmmod $WIFIMOD
modprobe $WIFIMOD
fi
在编译Ultrabook时增加的配置文件：
diff --git a/arch/x86/configs/u36_defconfig b/arch/x86/configs/u36_defconfig
index 285ee74..53fa3d4 100644
--- a/arch/x86/configs/u36_defconfig
+++ b/arch/x86/configs/u36_defconfig
@@ -889,9 +889,11 @@ CONFIG_NETDEVICES=y
# CONFIG_VETH is not set
# CONFIG_NET_SB1000 is not set
# CONFIG_ARCNET is not set
-CONFIG_MII=m
+CONFIG_MII=y
+CONFIG_PHYLIB=m
# CONFIG_PHYLIB is not set
-# CONFIG_NET_ETHERNET is not set
+CONFIG_NET_ETHERNET=y
+CONFIG_AX88772B=y
CONFIG_NETDEV_1000=y
# CONFIG_ACENIC is not set
# CONFIG_DL2K is not set
===========================================
hardware/libhardware_legacy/wifi/wifi.c hardware/libhardware_legacy/include/hardware_legacy/wifi.h frameworks/base/core/java/com/android/internal/util/HierarchicalStateMachine.java frameworks/base/wifi/java/android/net/wifi/WifiNative.java frameworks/base/services/java/com/android/server/WifiService.java packages/apps/Settings/src/com/android/settings/wifi/WifiEnabler.java frameworks/base/wifi/java/android/net/wifi/WifiManager.java frameworks/base/wifi/java/android/net/wifi/WifiStateMachine.java frameworks/base/core/java/android/os/Message.java frameworks/base/core/java/com/android/internal/util/HierarchicalStateMachine.java wifi设置 packages/apps/Settings/src/com/android/settings/WirelessSettings.java onCreate（）函数中 heckBoxPreference wifi = (CheckBoxPreference) findPreference(KEY_TOGGLE_WIFI);设置使能wifi checkbox. Create a WifiEnabler: mWifiEnabler= new WifiEnabler(activity, wifi);
ssb->cfg80211->mac80211->b43
driver ko path:out/target/product/asus_x86/system/lib/modules/2.6.38-android-epc1015/kernel/drivers$
./kernel/arch/x86/configs/android-x86_defconfig中修改了 CONFIG_EXTRA_FIRMWARE="brcm/bcm43xx-0.fw brcm/bcm43xx_hdr-0.fw"728 CONFIG_EXTRA_FIRMWARE_DIR="/lib/firmware"
kernel/drivers/base/Kconfig
frameworks/base/include/surfaceflinger/Surface.h frameworks/base/include/ui/FramebufferNativeWindow.h frameworks/base/libs/ui/FramebufferNativeWindow.cpp frameworks/base/include/ui/egl/android_natives.h frameworks/base/libs/gui/SurfaceTexture.cpp frameworks/base/libs/surfaceflinger_client/Surface.cpp frameworks/base/libs/surfaceflinger_client/Surface.cpp
./libs/surfaceflinger_client/ISurfaceComposerClient.cpp:#define LOG_TAG "SurfaceFlinger" ./libs/surfaceflinger_client/ISurfaceComposer.cpp:#define LOG_TAG "SurfaceFlinger" ./libs/surfaceflinger_client/IGraphicBufferAlloc.cpp:#define LOG_TAG "SurfaceFlinger"
framework/base/service/surfaceflinger/DisplayHardware/HWComposer.cpp中设置“hwcomposer module not found!”
frameworks/base/core/java/android/view/Surface.java frameworks/base/core/jni/android_view_Surface.cpp 处理流程： (1)packages/apps/Settings/src/com/android/settings/WirelessSettings.java:当用户按下Wifi 按钮后，Android 会调用WifiEnabler 的onPreferenceChange. (2)packages/apps/Settings/src/com/android/settings/wifi/WifiEnabler.java:onPreferenceChange中调用mWifiManager.setWifiEnabled(enable) （3）frameworks/base/wifi/java/android/net/wifi/WifiManager.java：setWifiEnabled 中调用mService.setWifiEnabled(enabled) （4）frameworks/base/services/java/com/android/server/WifiService.java：setWifiEnabled中调用 mWifiStateMachine.setWifiEnabled(enable) （5）frameworks/base/wifi/java/android/net/wifi/WifiStateMachine.java：setWifiEnabled中调用sendMessage(obtainMessage(CMD_LOAD_DRIVER, WIFI_STATE_ENABLING, 0));sendMessage(CMD_START_SUPPLICANT); 在class DriverLoadingState中run线程中调用WifiNative.loadDriver()。 在class DriverLoadedState中调用WifiNative.startSupplicant()。 (6)在frameworks/base/wifi/java/android/net/wifi/WifiMonitor.java中调用WifiNative.waitForEvent（）不断读取底层消息，并调用mStateMachine.sendMessage（xxx）作出响应。 （7）frameworks/base/wifi/java/android/net/wifi/WifiNative.java： loadDriver （8）frameworks/base/core/jni/android_net_wifi_Wifi.cpp：android_net_wifi_loadDriver中调用::wifi_load_driver （9）hardware/libhardware_legacy/wifi/wifi.c
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