wifi全程移植

编译代码时，本目录下用ｍｍ，上级目录用ｍｍｍ，如果加上参数－Ｂ则表示强制该目录下的所有文件。
如果编译时显示的编译信息有乱码情况，则需要在该终端export LANG=en　。

移植framework，hardware，wpa_supplicant，dhcpcd及system/core/init
一　修改framework
./frameworks/base/wifi/java/android/net/wifi/WifiStateTracker.java
将mInterfaceName = SystemProperties.get("wifi.interface", "tiwlan0");改成 mInterfaceName = SystemProperties.get("wifi.interface", "eth0");
编译生成
framework.jar
更新jar包：
adb push system/framework/framework.jar /system/framework

二　修改hardware
./hardware/libhardware_legacy/wifi/wifi.c
１　引用库文件：#include <unistd.h>
２　更改wifi接口，将#define WIFI_DEF_IFNAME   "wlan0"改成 #define WIFI_DEF_IFNAME  "eth0"（视项目具体情况而定）
３　更改驱动名及路径：将#define WIFI_DRIVER_MODULE_PATH  "/system/lib/modules/wlan.ko"改成 #define WIFI_DRIVER_MODULE_PATH "/data/dhd.ko"
４　更改驱动模块名：将#define WIFI_DRIVER_MODULE_NAME  "wlan"　改成　#define WIFI_DRIVER_MODULE_NAME  "dhd"
５　更改wifi接口路径：将static const char IFACE_DIR[] = "/data/system/wpa_supplicant"; 改成 static const char IFACE_DIR[] = "/data/wpa_supplicant";
６　增加wifi上电，下电代码：
static const char CONFIG_UP_NAME[] = "wifi_up";
static const char CONFIG_DOWN_NAME[] = "wifi_down";
static const char WIFI_POWER_PATH[] = "/sys/devices/platform/bcm4319-pm/power_state";
static const char * off_state = "off";
static const char * on_state = "on";
static int set_wifi_power(int on)       // on is 0: wifi down power, otherwise wifi up power.
{
    int fd = -1;
    int ret = -1;
    char buf[6];
    int len;

    fd = open(WIFI_POWER_PATH, O_WRONLY);
    //fd = open("/sys/devices/platform/bcm4319-pm/power_state", O_RDWR);
    LOGE("set_wifi_power fd=%d\n", fd);
    if (fd < 0) {
        LOGE("open wifi file %s failed.", WIFI_POWER_PATH);
        goto out;
    }
    if (on) {
        len = sprintf(buf, "on");
    } else {
        len = sprintf(buf, "off");
    }

    len = write(fd, buf, len);
    if (len < 0) {
        LOGE("write wifi file %s failed.", WIFI_POWER_PATH);
        goto out;
    }
    LOGE("set wifi power %s", WIFI_POWER_PATH);
    LOGE("whether wifi is on : %s", buf);
    close(fd);
    return 0;

out:
    if (fd >= 0) {
        close(fd);
    }

    return ret;
}

在insmod方法中的free(module);后面增加如下代码：
if (0 == ret) {
            property_set("ctl.start", CONFIG_UP_NAME);
}
在rmmod方法中的while循环后面增加如下代码：
if (0 == ret) {
        property_set("ctl.start", CONFIG_DOWN_NAME);
}

在wifi_load_driver中调用set_wifi_power(1);
在wifi_unload_driver中调用set_wifi_power(0);

编译生成
libhardware_legacy.so
更新so文件
adb push system/lib/libhardware_legacy.so /system/lib

三　修改wpa_supplicant
./external/wpa_supplicant/wpa_supplicant.conf
将　ctrl_interface=wlan0 改成　ctrl_interface=/data/wpa_supplicant
编译生成
wpa_supplicant.conf
更新文件
adb push system/etc/wifi/wpa_supplicant.conf /system/etc/wifi

如果希望log中能打印出所有级别的log信息，则可以更改wpa_supplicant目录下的common.h文件。
将wpa_printf定义中的if ((level) >= MSG_INFO) 改成　if ((level) >= MSG_ERROR)　如下：
#define wpa_printf(level, ...) \
        do {                                            \
            if ((level) >= MSG_ERROR) {                  \
                android_printf((level), __VA_ARGS__);   \
            }                                           \
        } while (0)

编译生成
wpa_supplicant
更新bin文件
adb push system/bin/wpa_supplicant /system/bin

四　修改dhcpcd
１　./external/dhcpcd/Android.mk
将以下代码打开
include $(CLEAR_VARS)
LOCAL_MODULE := dhcpcd.conf
LOCAL_MODULE_TAGS := user
LOCAL_MODULE_CLASS := ETC
LOCAL_MODULE_PATH := $(etc_dir)
LOCAL_SRC_FILES := android.conf
include $(BUILD_PREBUILT)

２　./external/dhcpcd/android.conf
将interface wlan0注释掉

３　./external/dhcpcd/dhcp.c
将　return (const uint8_t *)dhcp_opt_buffer;　改成　return (const uint8_t *)&dhcp_opt_buffer;
４　./external/dhcpcd/dhcpcd-hooks/20-dns.conf
在set_dns_props方法最后加上如下脚本代码：
for i in 1 2 3 4; do
      setprop net.dns${i} ""
done

count=1
for dnsaddr in ${new_domain_name_servers}; do
     setprop net.dns${count} ${dnsaddr}
     count=$(($count + 1))
done
在unset_dns_props方法中加上如下脚本代码：
for i in 1 2 3 4; do
       setprop dhcp.${interface}.dns${i} ""
done

for i in 1 2 3 4; do
       setprop net.dns${i} ""
done
编译生成
dhcpcd，dhcpcd.conf, 20-dns.conf
更新文件
adb push system/bin/dhcpcd /system/bin
adb push system/etc/dhcpcd.conf /system/etc/dhcpcd
adb push system/etc/dhcpcd/dhcpcd-hooks/20-dns.conf /system/etc/dhcpcd/dhcpcd-hooks

五　修改system/core
./system/core/init/property_service.c
如下结构体内容：
struct {
    const char *prefix;
    unsigned int uid;
    unsigned int gid;
} property_perms[] = {
    { "net.rmnet0.",      AID_RADIO,    0 },
    { "net.gprs.",        AID_RADIO,    0 },
    { "net.ppp",          AID_RADIO,    0 },
    { "ril.",             AID_RADIO,    0 },
    { "gsm.",             AID_RADIO,    0 },
    { "persist.radio",    AID_RADIO,    0 },
    { "net.dns",          AID_RADIO,    0 },
    { "net.",             AID_SYSTEM,   0 },
    { "dev.",             AID_SYSTEM,   0 },
    { "runtime.",         AID_SYSTEM,   0 },
    { "hw.",              AID_SYSTEM,   0 },
    { "sys.",             AID_SYSTEM,   0 },
    { "service.",         AID_SYSTEM,   0 },
    { "wlan.",            AID_SYSTEM,   0 },
    { "dhcp.",            AID_SYSTEM,   0 },
    { "dhcp.",            AID_DHCP,     0 },
    { "net.",             AID_DHCP,     0 }, // add to avoid "permission denied" error
    { "net.dns",          AID_DHCP,     0 }, // add to avoid "permission denied" error
    { "vpn.",             AID_SYSTEM,   0 },
    { "vpn.",             AID_VPN,      0 },
    { "debug.",           AID_SHELL,    0 },
    { "log.",             AID_SHELL,    0 },
    { "service.adb.root", AID_SHELL,    0 },
    { "persist.sys.",     AID_SYSTEM,   0 },
    { "persist.service.", AID_SYSTEM,   0 },
    { "persist.security.", AID_SYSTEM,  0 },
    { "xec.",             AID_SYSTEM,    0 },
    { "user.",        AID_SYSTEM,  0 },
    { "media.",           AID_MEDIA,    0 },
    { NULL, 0, 0 }
};

/*
* White list of UID that are allowed to start/stop services.
* Currently there are no user apps that require.
*/
struct {
    const char *service;
    unsigned int uid;
    unsigned int gid;
} control_perms[] = {
    { "dumpstate",AID_SHELL, AID_LOG },
    { "pppd_gprs", AID_RADIO, AID_RADIO },
    { "pppd_gprs2", AID_RADIO, AID_RADIO },
    { NULL, 0, 0 }
};
编译生成
system/lib/libpixelflinger.so
system/bin/test-opengl-codegen
root/init
最后将以上文件更新到设备上

六　更新驱动
adb push dhd.ko /data
adb push fw_bcm4329.bin /data
adb push nvram.txt /data

注意：如果移植后出现设备不能启动，并且log中一直循环打印“NetId1.0......”时，则可以考虑编译环境是否正确，版本是否一致。
比如，你的设备上烧写的是最新的image，kernel等，而你在本地的老版本中更改文件后，编译出的是老版本的bin文件，jar包，
当push到设备中后出现版本不一致，最新版本中很多库文件或者设备的配置环境已经发生改变，造成设备不能正常启动。