arm linux 支持 wifi

背景：

　　公司用的产品主板支持wifi接口，为了加强产品的功能，做wifi的底层支持。

概览

主要的流程如下：

内核配置 + 有关驱动的移植 + 软件的移植 + 软件的配置

内核配置

Networking support
        <*>   RF switch subsystem support  --->
                [*]   Power off on suspend (NEW)
                <*>   Generic rfkill regulator driver
                （防止使用wpa_supplicant会出现rfkill: Cannot open RFKILL  control device错误。）

        -*-   Wireless  --->
        <*>   cfg80211 - wireless configuration API
        [*]     nl80211 testmode command
        [*]     enable powersave by default
        [*]     cfg80211 wireless extensions compatibility
        <*>   Generic IEEE 802.11 Networking Stack  (mac80211)

作为AP热点的额外配置

Device Drivers  --->
   [*] Network device support  --->
        [*] Wireless LAN  --->
                        <*>    IEEE 802.11 for Host AP  (Prism2/2.5/3 and WEP/TKIP/CCMP)
                        [*]     Support downloading firmware  images with Host AP driver
                        [*]       Support for non-volatile  firmware download

软件移植

根据有关资料，移植wifi有关驱动各工具如下：

软件包	说明
WirelessTools	只支持WEP认证方式
wpa_supplicant	支持WPA认证方式
hostapd	hostapd能够使得无线网卡切换为master模式，模拟AP(通常可以认为是路由器)功能软AP(Soft AP）
dhcpcd	dhcpcd是DHCP client的实现，可以作为后台守护进程运行。

一个脚本编译 wpa_supplicant：

##
#    Copyright By Schips, All Rights Reserved
#    https://gitee.com/schips/
#    File Name:  make.sh
#    Created  :  Tue 10 Dec 2019 05:42:56 PM CST
#!/bin/sh
BUILD_HOST=arm-linux
ARM_GCC=${BUILD_HOST}-gcc
BASE=`pwd`
OUTPUT_PATH=${BASE}/install
OPENSSL=openssl-1.0.2t
WPA_SUPPLICANT=wpa_supplicant-0.7.3

make_dirs() {
    cd ${BASE}
    mkdir  compressed  install  source -p
}

download_package () {
    cd ${BASE}/compressed
    #下载包
    wget     https://www.openssl.org/source/${OPENSSL}.tar.gz
    wget -c http://w1.fi/releases/${WPA_SUPPLICANT}.tar.gz
}

tar_package () {
    cd ${BASE}/compressed
    ls * > /tmp/list.txt
    for TAR in `cat /tmp/list.txt`
    do
        tar -xf $TAR -C  ../source
    done
    rm -rf /tmp/list.txt
}

pre_make_ssl () {
    cd ${BASE}/source/${OPENSSL}
    startLine=`sed -n '/install_html_docs\:/=' Makefile |  awk -F\b '{ print $1 }'`
    echo $startLine
    # 为了避免 多行结果
    for startline in $startLine
    do
        lineAfter=99
        endLine=`expr $startline + 999`
        sed -i $startline','$endLine'd' Makefile
        echo "install_html_docs:" >> Makefile
        echo "\t@echo skip by Schips" >> Makefile
        echo "install_docs:" >> Makefile
        echo "\t@echo skip by Schips" >> Makefile
        echo "# DO NOT DELETE THIS LINE -- make depend  depends on it." >> Makefile
        break
    done
}

make_openssl () {
    cd ${BASE}/source/${OPENSSL}
    echo "SSL ABOUT"
        ./Configure --prefix=${OUTPUT_PATH}/${OPENSSL}  os/compiler:${ARM_GCC}
    pre_make_ssl
    make && make install
}
make_wpa () {
    cd ${BASE}/source/wpa*/wpa*
    cp defconfig .config
    echo "CC=${ARM_GCC} -L${OUTPUT_PATH}/${OPENSSL}/lib"  >> .config
    echo "CFLAGS += -I${OUTPUT_PATH}/${OPENSSL}/include"  >> .config
    echo "LIBS += -L${OUTPUT_PATH}/${OPENSSL}/lib" >>  .config
    make
}
make_dirs
download_package
tar_package
make_openssl
make_wpa