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wifi enable

时间:2014-06-06 20:13:55      阅读:600      评论:0      收藏:0      [点我收藏+]

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wifiservice.java wifistateMachine.java中
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/**
     * see {@link android.net.wifi.WifiManager#setWifiEnabled(boolean)}
     * @param enable {@code true} to enable, {@code false} to disable.
     * @return {@code true} if the enable/disable operation was
     *         started or is already in the queue.
     */
    public synchronized boolean setWifiEnabled(boolean enable) {
        enforceChangePermission();
        Slog.d(TAG, "setWifiEnabled: " + enable + " pid=" + Binder.getCallingPid()
                    + ", uid=" + Binder.getCallingUid());
        if (DBG) {
            Slog.e(TAG, "Invoking mWifiStateMachine.setWifiEnabled\n");
        }

        if (enable) {
            reportStartWorkSource();
        }
        mWifiStateMachine.setWifiEnabled(enable);

        /*
         * Caller might not have WRITE_SECURE_SETTINGS,
         * only CHANGE_WIFI_STATE is enforced
         */

        long ident = Binder.clearCallingIdentity();
        try {
            handleWifiToggled(enable);
        } finally {
            Binder.restoreCallingIdentity(ident);
        }

        if (enable) {
            if (!mIsReceiverRegistered) {
                registerForBroadcasts();
                mIsReceiverRegistered = true;
            }
        } else if (mIsReceiverRegistered) {
            mContext.unregisterReceiver(mReceiver);
            mIsReceiverRegistered = false;
        }

        return true;
    }
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public void setWifiEnabled(boolean enable) {
        mLastEnableUid.set(Binder.getCallingUid());
        if (enable) {
            /* Argument is the state that is entered prior to load */
            sendMessage(obtainMessage(CMD_LOAD_DRIVER, WIFI_STATE_ENABLING, 0));
            sendMessage(CMD_START_SUPPLICANT);
        } else {
            sendMessage(CMD_STOP_SUPPLICANT);
            /* Argument is the state that is entered upon success */
            sendMessage(obtainMessage(CMD_UNLOAD_DRIVER, WIFI_STATE_DISABLED, 0));
        }
    }
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当前stateMachine应为DriverUnloadedState,转到mDriverLoadingState状态

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class DriverUnloadedState extends State {
        @Override
        public void enter() {
            if (DBG) log(getName() + "\n");
            EventLog.writeEvent(EVENTLOG_WIFI_STATE_CHANGED, getName());
        }
        @Override
        public boolean processMessage(Message message) {
            if (DBG) log(getName() + message.toString() + "\n");
            switch (message.what) {
                case CMD_LOAD_DRIVER:
                    transitionTo(mDriverLoadingState);
                    break;
                default:
                    return NOT_HANDLED;
            }
            return HANDLED;
        }
    }
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class DriverLoadingState extends State {
        @Override
        public void enter() {
            if (DBG) log(getName() + "\n");
            EventLog.writeEvent(EVENTLOG_WIFI_STATE_CHANGED, getName());

            final Message message = new Message();
            message.copyFrom(getCurrentMessage());
            /* TODO: add a timeout to fail when driver load is hung.
             * Similarly for driver unload.
             */
            new Thread(new Runnable() {
                public void run() {
                    mWakeLock.acquire();
                    //enabling state
                    switch(message.arg1) {
                        case WIFI_STATE_ENABLING:
                            setWifiState(WIFI_STATE_ENABLING);
                            break;
                        case WIFI_AP_STATE_ENABLING:
                            setWifiApState(WIFI_AP_STATE_ENABLING);
                            break;
                    }

                    if(mWifiNative.loadDriver()) {
                        if (DBG) log("Driver load successful");
                        sendMessage(CMD_LOAD_DRIVER_SUCCESS);
                    } else {
                        loge("Failed to load driver!");
                        switch(message.arg1) {
                            case WIFI_STATE_ENABLING:
                                setWifiState(WIFI_STATE_UNKNOWN);
                                break;
                            case WIFI_AP_STATE_ENABLING:
                                setWifiApState(WIFI_AP_STATE_FAILED);
                                break;
                        }
                        sendMessage(CMD_LOAD_DRIVER_FAILURE);
                    }
                    mWakeLock.release();
                }
            }).start();
        }

        @Override
        public boolean processMessage(Message message) {
            if (DBG) log(getName() + message.toString() + "\n");
            switch (message.what) {
                case CMD_LOAD_DRIVER_SUCCESS:
                    transitionTo(mDriverLoadedState);
                    break;
                case CMD_LOAD_DRIVER_FAILURE:
                    transitionTo(mDriverFailedState);
                    break;
                case CMD_LOAD_DRIVER:
                case CMD_UNLOAD_DRIVER:
                case CMD_START_SUPPLICANT:
                case CMD_STOP_SUPPLICANT:
                case CMD_START_AP:
                case CMD_STOP_AP:
                case CMD_START_DRIVER:
                case CMD_STOP_DRIVER:
                case CMD_SET_SCAN_MODE:
                case CMD_SET_SCAN_TYPE:
                case CMD_SET_COUNTRY_CODE:
                case CMD_SET_FREQUENCY_BAND:
                case CMD_START_PACKET_FILTERING:
                case CMD_STOP_PACKET_FILTERING:
                    deferMessage(message);
                    break;
                default:
                    return NOT_HANDLED;
            }
            return HANDLED;
        }
    }
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在DriverLoadingState 中产生第一个native函数:mWifiNative.loadDriver

通过JNI最终调用到wifi.c,

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int wifi_load_driver()
{
    do_wifi_workaround();// leon 1
#ifdef WIFI_DRIVER_MODULE_PATH
    char driver_status[PROPERTY_VALUE_MAX];
    int count = 100; /* wait at most 20 seconds for completion */

    if (is_wifi_driver_loaded()) {
        return 0;
    }

    if (insmod(DRIVER_MODULE_PATH, DRIVER_MODULE_ARG) < 0)// leon 2 
        return -1;
#ifdef BOARD_WIFI_ATHEROS
        if (insmod(DRIVER_MODULE_PATH_2, DRIVER_MODULE_ARG_2) < 0)
        return -1;
        if (insmod(DRIVER_MODULE_PATH_3, DRIVER_MODULE_ARG_3) < 0)
        return -1;        
        
    property_set("ctl.start", ADD_P2P);    
#endif

    if (strcmp(FIRMWARE_LOADER,"") == 0) {
        if (strcmp(WIFI_DRIVER_MODULE_NAME, "8192cu") == 0)
            usleep(1600000);
        else
            usleep(WIFI_DRIVER_LOADER_DELAY);
        property_set(DRIVER_PROP_NAME, "ok");
    }
    else {
        property_set("ctl.start", FIRMWARE_LOADER);
    }
    sched_yield();
    while (count-- > 0) {
        if (property_get(DRIVER_PROP_NAME, driver_status, NULL)) {
            if (strcmp(driver_status, "ok") == 0)
                return 0;
            else if (strcmp(DRIVER_PROP_NAME, "failed") == 0) {
                wifi_unload_driver();
                return -1;
            }
        }
        usleep(200000);
    }
    property_set(DRIVER_PROP_NAME, "timeout");
    wifi_unload_driver();
    return -1;
#else
    property_set(DRIVER_PROP_NAME, "ok");
    return 0;
#endif
}
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#define WIFI_FIX_SVC    "wififix"
int do_wifi_workaround() {                                                                                                                                                                                   
    property_set("ctl.start", WIFI_FIX_SVC);
    return 0;
}


driver 加载成功后,将状态转移到transitionTo(mDriverLoadedState); 接下来执行sendMessage(CMD_START_SUPPLICANT);

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class DriverLoadedState extends State {
        @Override
        public void enter() {
            if (DBG) log(getName() + "\n");
            EventLog.writeEvent(EVENTLOG_WIFI_STATE_CHANGED, getName());
        }
        @Override
        public boolean processMessage(Message message) {
            if (DBG) log(getName() + message.toString() + "\n");
            switch(message.what) {
                case CMD_UNLOAD_DRIVER:
                    transitionTo(mDriverUnloadingState);
                    break;
                case CMD_START_SUPPLICANT:
                    try {
                        mNwService.wifiFirmwareReload(mInterfaceName, "STA");
                    } catch (Exception e) {
                        loge("Failed to reload STA firmware " + e);
                        // continue
                    }
                   try {
                       //A runtime crash can leave the interface up and
                       //this affects connectivity when supplicant starts up.
                       //Ensure interface is down before a supplicant start.




mNwService.setInterfaceDown(mInterfaceName); //Set privacy extensions mNwService.setInterfaceIpv6PrivacyExtensions(mInterfaceName, true); } catch (RemoteException re) { loge("Unable to change interface settings: " + re); } catch (IllegalStateException ie) { loge("Unable to change interface settings: " + ie); } /* Stop a running supplicant after a runtime restart * Avoids issues with drivers that do not handle interface down * on a running supplicant properly. */ if (DBG) log("Kill any running supplicant"); mWifiNative.killSupplicant(mP2pSupported); if(mWifiNative.startSupplicant(mP2pSupported)) { if (DBG) log("Supplicant start successful"); mWifiMonitor.startMonitoring(); transitionTo(mSupplicantStartingState); } else { loge("Failed to start supplicant!"); sendMessage(obtainMessage(CMD_UNLOAD_DRIVER, WIFI_STATE_UNKNOWN, 0)); } break; case CMD_START_AP: transitionTo(mSoftApStartingState); break; default: return NOT_HANDLED; } return HANDLED; } }
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/* @param mode can be "AP", "STA" or "P2P" */
    @Override
    public void wifiFirmwareReload(String wlanIface, String mode) {
        mContext.enforceCallingOrSelfPermission(CONNECTIVITY_INTERNAL, TAG);
        try {
            mConnector.execute("softap", "fwreload", wlanIface, mode);
        } catch (NativeDaemonConnectorException e) {
            throw e.rethrowAsParcelableException();
        }
    }
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property_set("ctl.start", "wififix" );

insmod /system/lib/dhd.ko

usleep 1000,000

property_set(DRIVER_PROP_NAME, "ok");//static const char DRIVER_PROP_NAME[]    = "wlan.driver.status";

//间隔0.2s,总计20s

reload firmware,没有搞清楚是如何加载的。

killall wps

mWifiNative.startSupplicant(mP2pSupported)

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wifi enable

标签:android   c   style   class   blog   code   

原文地址:http://www.cnblogs.com/leino11121/p/3765988.html

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