android wifi ralink rt3070开发记录

                      ifeq($(PLATFORM),BCM7431)

                      LINUX_SRC= ${ANDROID_PATH}/kernel   #修改path为你的android目录

                      endif

                             驱动编译后会生成两个文件：RT5370STA.ko  和RT2870STA.dat，后面

                      会看到需要拷贝这两个文件到系统中。

                            ioctl 驱动代码接口在os/linux/sta_ioctl.c   及 sta/sta_cfg.c中，如果遇到一些错误，一般在这里都能查找到.

                2）把rt5370sta.ko拷贝到.../lib/modules目录中

                     include$(CLEAR_VARS)LOCAL_MODULE := rt5370sta.koLOCAL_MODULE_TAGS:= userLOCAL_MODULE_CLASS:= SHARED_LIBRARIESLOCAL_MODULE_PATH:= $(TARGET_OUT_SHARED_LIBRARIES)/modulesLOCAL_SRC_FILES:= ${RT5370_PATH}/rt5370sta.ko    #PATHinclude$(BUILD_PREBUILT)

               3) 查看wifi.c文件ko路径及名字是否正确，若不正确需要修改正确

                4) 修改init.rc文件

                     chmod 0771 /system/etc/wifi wifi wifi

                     chmod 0660 /system/etc/wifi/wpa_supplicant.conf

                     chown wifi wifi /system/etc/wifi/wpa_supplicant.conf

                     mkdir /data/misc/wifi 0771 wifi wifi

                     mkdir /data/misc/wifi/sockets 0771 wifi wifi

                    #wpa_supplicant socket

                    mkdir /data/system/ 0771 system system

                    mkdir /data/system/wpa_supplicant 0771 wifi wifi

                    mkdir /data/misc/dhcp 0771 system system

                    chmod 0777 /system/etc/dhcpcd/dhcpcd-run-hooks

                    chmod 0777 /data/misc/dhcp/

                    mountyaffs2 mtd@system /system ro remount

                    setprop wifi.interface wlan0

                    service wpa_supplicant /system/bin/wpa_supplicant -dd -Dwext -iwlan0 -c/system/etc/wifi/wpa_supplicant.conf

                            #group system wifi inet

                            disabled

                            oneshot

                    service dhcpcd_wlan0 /system/bin/dhcpcd wlan0     // 这里的service需要修改为dhcpcd_wlan0(android2.2 和2.3有差异，我这里是2.3)，而不是dhcpcd！

                            group system dhcp

                            disabled

                            oneshot

           5) 修改external/wpa_supplicant/driver_wext.c

                这是为了避免wpa_supplicant与下层驱动通讯时出现ioctl[SIOCSIWPRIV]错误，因为现在大部分wifi模块对SIOCSIWPRIV命令不处理，而这个命令要用于侦测wifi强度RSSI的，比较简单的方法是在wifi驱动中增加个空函数或者修改调用的返回值为0。由于大多数模块不支持SIOCSIWPRIV，所以目前采用修改调用的返回值的方法。修改：froyo\external\wpa_supplicant\driver_wext.c

               wpa_driver_priv_driver_cmd()函数中：

                   // if((ret = ioctl(drv->ioctl_sock, SIOCSIWPRIV, &iwr)) < 0) {

                            //perror("ioctl[SIOCSIWPRIV]");

                      //                   }     

// 如果这里不注释掉，将导致系统不断报错，错误为 IOCTL::unknownIOCTL's cmd = 0x00008b0c，我跟踪了下代码驱动中并没有这个ioctl，

另外在wpa_supplicant的头文件中也显示未使用，但是在代码中却用了这个ioctl，所以必须把这段代码删除！

           6) 修改android打开WIFI流程

               经测试5370模块在ifconfig wlan0 down时配置

               iwconfig wlan0 mode Managed会出错，Android代码中的配置过程也是这样，表现就是关闭WIFI重新打开后扫描不到AP，修改：mips-gingerbread\frameworks\base\wifi\java\android\net\wifi\WifiStateTracker.java

                  public void resetConnections(boolean disableInterface)if(disableInterface){//if(LOCAL_LOGD) Log.d(TAG, "Disabling interface");//NetworkUtils.disableInterface(mInterfaceName);}    //此处若不修改将导致wifi关闭后再次开启，scan不到ap！

#netcfg

lo UP 127.0.0.1 255.0.0.0 0x00000049

eth0 UP 10.20.112.46 255.255.255.0 0x00001043

wlan0 DOWN 0.0.0.0 0.0.0.0 0x00001002

#iwconfig wlan0 mode Managed

Error for wireless request "Set Mode" (8B06) :

SET failed on device wlan0 ; Network is down.

#iwconfig wlan0 nickname "RobinYeung"

Error for wireless request "Set Nickname" (8B1C) :

SET failed on device wlan0 ; Network is down.

        上面java代码的调用函数为：

static jint android_net_utils_disableInterface(JNIEnv* env, jobject clazz, jstring ifname)
{int result;const char *nameStr = env->GetStringUTFChars(ifname, NULL);result = ::ifc_disable(nameStr);env->ReleaseStringUTFChars(ifname, nameStr);return (jint)result;
}

int ifc_disable(const char *ifname)
{int result;ifc_init();  // 调用socket函数，得到fdresult = ifc_down(ifname);  // 通过ioctl设定到内核ifc_set_addr(ifname, 0);ifc_close(); // 关闭fdreturn result;
}

int ifc_down(const char *name)
{return ifc_set_flags(name, 0, IFF_UP);
}static int ifc_set_flags(const char *name, unsigned set, unsigned clr)
{struct ifreq ifr;ifc_init_ifr(name, &ifr);if(ioctl(ifc_ctl_sock, SIOCGIFFLAGS, &ifr) < 0) return -1;ifr.ifr_flags = (ifr.ifr_flags & (~clr)) | set;return ioctl(ifc_ctl_sock, SIOCSIFFLAGS, &ifr);
}

down时flags & fffffffe，然后通过ioctl 设定到kernel。

                     在你的board配置目录下MIPSAndroid_Phase2.1/bcm_mipsgingerbread20111129/AppLibs/opensource/android/src/mips-gingerbread/vendor/broadcom/bcm_platform/prebuilt创建一个wpa_supplicant.conf文件，输入如下内容：

                        ctrl_interface=DIR=/data/system/wpa_supplicant GROUP=wifi

                        update_config=1

                        ap_scan=1

              8)修改board配置目录下的AndroidBoard.mk

               在MIPSAndroid_Phase2.1/bcm_mipsgingerbread20111129/AppLibs/opensource/android/src/mips-gingerbread/vendor/broadcom/bcm_platform/Android.mk 或AndroidBoard.mk下增加如下代码：

                      include$(CLEAR_VARS)

                      LOCAL_MODULE:= wpa_supplicant.conf

                      LOCAL_MODULE_TAGS:= user

                      LOCAL_MODULE_CLASS:= ETC

                      LOCAL_MODULE_PATH:= $(TARGET_OUT_ETC)/wifi

                      LOCAL_SRC_FILES:= $(LOCAL_MODULE)

                      include$(BUILD_PREBUILT)

              9)少了一个步骤，就是拷贝RT2870STA.dat到etc下

                      include $(CLEAR_VARS)
                      LOCAL_MODULE := RT2870STA.dat

                      LOCAL_MODULE_CLASS := ETC

                      LOCAL_MODULE_PATH := $(TARGET_OUT_ETC)/Wireless/RT2870STA

                      LOCAL_SRC_FILES := $(LOCAL_MODULE)

                      include $(BUILD_PREBUILT)

              10) make clean 然后

                 根据您的脚本build android or all

sqlite3 /data/data/com.android.providers.settings/databases/settings.db
delete from system where name = 'airplane_mode_on';
.exit

            else if (action.equals(WifiManager.NETWORK_STATE_CHANGED_ACTION) ||action.equals(WifiManager.WIFI_STATE_CHANGED_ACTION) ||action.equals(WifiManager.RSSI_CHANGED_ACTION)) {updateWifi(intent); }

    private final void updateWifi(Intent intent) {final String action = intent.getAction();if (action.equals(WifiManager.WIFI_STATE_CHANGED_ACTION)) {final boolean enabled = intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE,WifiManager.WIFI_STATE_UNKNOWN) == WifiManager.WIFI_STATE_ENABLED;if (!enabled) {// If disabled, hide the icon. (We show icon when connected.)mService.setIconVisibility("wifi", false);}} else if (action.equals(WifiManager.SUPPLICANT_CONNECTION_CHANGE_ACTION)) {final boolean enabled = intent.getBooleanExtra(WifiManager.EXTRA_SUPPLICANT_CONNECTED,false);if (!enabled) {mService.setIconVisibility("wifi", false);}} else if (action.equals(WifiManager.RSSI_CHANGED_ACTION)) {int iconId;final int newRssi = intent.getIntExtra(WifiManager.EXTRA_NEW_RSSI, -200);int newSignalLevel = WifiManager.calculateSignalLevel(newRssi,sWifiSignalImages[0].length);if (newSignalLevel != mLastWifiSignalLevel) {mLastWifiSignalLevel = newSignalLevel;if (mIsWifiConnected) {iconId = sWifiSignalImages[mInetCondition][newSignalLevel];} else {iconId = sWifiTemporarilyNotConnectedImage;}mService.setIcon("wifi", iconId, 0);}}} 

    /*** Calculates the level of the signal. This should be used any time a signal* is being shown.* * @param rssi The power of the signal measured in RSSI.* @param numLevels The number of levels to consider in the calculated*            level.* @return A level of the signal, given in the range of 0 to numLevels-1*         (both inclusive).*/public static int calculateSignalLevel(int rssi, int numLevels) {if (rssi <= MIN_RSSI) {return 0;} else if (rssi >= MAX_RSSI) {return numLevels - 1;} else {int partitionSize = (MAX_RSSI - MIN_RSSI) / (numLevels - 1);return (rssi - MIN_RSSI) / partitionSize;}}



I/WifiStateTracker( 1799): ----------getRssiApprox------------WifiNative.getRssiCommand():-20
I/WifiStateTracker( 1799): ---------------------->newRssi:-20
I/WifiStateTracker( 1799): ---------------------->newSignalLevel:3


        根据log可发现level为-20，而根据计算公式算为 （-55 - （-100））/ 3 = 15；

/sys/class/net # ls
lo
eth0
wlan0
/sys/class/net # ls -l
lrwxrwxrwx root     root              1969-12-31 16:59 lo -> ../../devices/virtual/net/lo
lrwxrwxrwx root     root              1969-12-31 16:00 eth0 -> ../../devices/platform/bcmgenet.0/net/eth0
lrwxrwxrwx root     root              1969-12-31 16:59 wlan0 -> ../../devices/platform/ehci-brcm.1/usb2/2-1/net/wlan0

static const char DRIVER_FILE[]         = "/sys/class/net/wlan0";

int check_device(){int devfd = 0;devfd = open(DRIVER_FILE, O_RDONLY);if (devfd < 0) {close(devfd);LOGE("Cannot open \"%s\": %s", DRIVER_FILE, strerror(errno));return -1;}close(devfd);return 0;
}