wifi适配

linux驱动添加

安卓下使能外设驱动都需要先适配好linux下驱动，所以首先来编译linux驱动模块

1. 拷贝官方驱动（github的资源文件目录下下载）到lichee的linux驱动目录下
   ~~~
   zp@ubuntu:~/develop/a13_android4.1_v1.2/lichee$ ls linux-3.0/drivers/net/wireless/rtl8723bu/
   clean core hal ifcfg-wlan0 include Kconfig Makefile os_dep platform runwpa wlan0dhcp
   ~~~
2. 配置驱动Makefile以及Kconfig，然后在menuconfig里选中刚加入的驱动
   CONFIG_PLATFORM_ARM_SUNxI = y
obj-$(CONFIG_RTL8723BU) += rtl8723bu/
source "drivers/net/wireless/rtl8723bu/Kconfig"
<M> Realtek 8723B USB WiFi
3. 重新编译lichee，获得内核模块
   ./build.sh -p a13_nuclear -k 3.0
   ~~~
   zp@ubuntu:~/develop/a13_android4.1_v1.2/lichee$ ls out/android/lib/modules/3.0.8+/87*
   out/android/lib/modules/3.0.8+/8723bu.ko
   ~~~
4. 修改wifi驱动，隐藏过多调试信息
   前面这样生成的ko带有很多调试信息输出，以至于开启wifi模块时太慢，导致打开wifi超时，所以需要隐藏多余的信息。
   编辑linux-3.0/drivers/net/wireless/rtl8723bu/include/autoconf.h，去掉DEBUG的相关宏定义。

安卓配置文件

1. 修改板级配置文件device/softwinner/nuclear-evb/BoardConfig.mk
   ~~~
   BOARD_WIFI_VENDOR := realtek
   ifeq ($(BOARD_WIFI_VENDOR), realtek)
   WPA_SUPPLICANT_VERSION := VER_0_8_X
   BOARD_WPA_SUPPLICANT_DRIVER := NL80211
   BOARD_WPA_SUPPLICANT_PRIVATE_LIB := lib_driver_cmd_rtl
   BOARD_HOSTAPD_DRIVER := NL80211
   BOARD_HOSTAPD_PRIVATE_LIB := lib_driver_cmd_rtl

   SW_BOARD_USR_WIFI := rtl8723bu
   BOARD_WLAN_DEVICE := rtl8723bu
   endif
   ~~~

2. 修改init启动脚本init.sun5i.rc
   ~~~
   # 1.1 realtek wifi sta service
   service wpa_supplicant /system/bin/wpa_supplicant -iwlan0 -Dnl80211 -c/data/misc/wifi/wpa_supplicant.conf -e/data/misc/wifi/entropy.bin

      class main
      socket wpa_wlan0 dgram 660 wifi wifi
      disabled
      oneshot
   

# 1.2 realtek wifi sta p2p concurrent service
service p2p_supplicant /system/bin/wpa_supplicant

      -ip2p0 -Dnl80211 -c/data/misc/wifi/p2p_supplicant.conf -e/data/misc/wifi/entropy.bin -N 
      -iwlan0 -Dnl80211 -c/data/misc/wifi/wpa_supplicant.conf
      class main
      socket wpa_wlan0 dgram 660 wifi wifi
      disabled
      oneshot

~~~
3.修改安卓板级mk文件nuclear_evb.mk（蓝牙需要，wifi不用改）

1. 修改安卓hardware相关代码hardware/libhardware_legacy/wifi/wifi.c

     #elif defined RTL_8723BU_WIFI_USED
       /* rtl8723bu usb wifi */
       #ifndef WIFI_DRIVER_MODULE_PATH
       #define WIFI_DRIVER_MODULE_PATH         "/system/vendor/modules/8723bu.ko"
       #endif
       #ifndef WIFI_DRIVER_MODULE_NAME
       #define WIFI_DRIVER_MODULE_NAME         "8723bu"
       #endif
   

#ifndef WIFI_DRIVER_MODULE_ARG
#define WIFI_DRIVER_MODULE_ARG         "ifname=wlan0 if2name=p2p0"

5. wifi的安卓mk修改
  ~~~
  hardware/libhardware_legacy/wifi/Android.mk
  ifeq ($(SW_BOARD_USR_WIFI), rtl8723bu)
  LOCAL_CFLAGS += -DRTL_8723BU_WIFI_USED
  LOCAL_CFLAGS += -DRTL_WIFI_VENDOR
  endif
  ~~~
6. wpa的安卓mk修改

external/wpa_supplicant_8/wpa_supplicant/Android.mk
ifeq ($(SW_BOARD_USR_WIFI), rtl8188eu)
L_CFLAGS += -DCONFIG_WFD
endif

  5. 重新编译安卓
  实际需要更新的就只有libhardware_legacy.so和8723bu.ko，当然也可以打包整个镜像重新烧写。
  以局部更新为例，挂载tf卡的第7分区，拷贝so到lib/libhardware_legacy.so
  拷贝ko到vendor/modules 
  sync后启动即可