android之Radio状态

android 5.1

在Java层，Radio只有三种状态：

    enum RadioState {        RADIO_OFF,         /* Radio explicitly powered off (eg CFUN=0) */        RADIO_UNAVAILABLE, /* Radio unavailable (eg, resetting or not booted) */        RADIO_ON;          /* Radio is on */        public boolean isOn() /* and available...*/ {            return this == RADIO_ON;        }        public boolean isAvailable() {            return this != RADIO_UNAVAILABLE;        }    }

在C层，radio有多个状态：

状态转换在RIL.java中的getRadioStateFromInt方法中

第一，在rild和RILJ中，radio初始状态都是UNAVAILABLE

rild进程启动时，radio的状态默认会设置为RADIO_STATE_UNAVAILABLE

reference-ril.c

static RIL_RadioState sState = RADIO_STATE_UNAVAILABLE;

RILJ初始化时，Radio状态为RADIO_UNAVAILABLE

BaseCommands.java

protected RadioState mState = RadioState.RADIO_UNAVAILABLE;

第二，rild进程初始化过程中，设置radio状态为OFF

1. rild.cpp main()

rilInit = (const RIL_RadioFunctions *(*)(const struct RIL_Env *, int, char **))dlsym(dlHandle, "RIL_Init");funcs = rilInit(&s_rilEnv, argc, rilArgv);

2. reference-ril.c

ret = pthread_create(&s_tid_mainloop, &attr, mainLoop, NULL);RIL_requestTimedCallback(initializeCallback, NULL, &TIMEVAL_0);static void initializeCallback(void *param __unused)setRadioState (RADIO_STATE_OFF);

第三，rild中，radio状态切换为OFF后，会通知RILJ

        RIL_onUnsolicitedResponse (RIL_UNSOL_RESPONSE_RADIO_STATE_CHANGED,                                    NULL, 0);        // Sim state can change as result of radio state change        RIL_onUnsolicitedResponse (RIL_UNSOL_RESPONSE_SIM_STATUS_CHANGED,                                    NULL, 0);

第四，RILJ收到radio的新状态，会去通知关心RadioStateChange和RadioAvailable的订阅者

case RIL_UNSOL_RESPONSE_RADIO_STATE_CHANGED:    /* has bonus radio state int */    RadioState newState = getRadioStateFromInt(p.readInt());    if (RILJ_LOGD) unsljLogMore(response, newState.toString());    switchToRadioState(newState);private void switchToRadioState(RadioState newState) {    setRadioState(newState);}protected void setRadioState(RadioState newState) {    mRadioStateChangedRegistrants.notifyRegistrants();    if (mState.isAvailable() && !oldState.isAvailable()) {        mAvailRegistrants.notifyRegistrants();        onRadioAvailable();    }}

第五，只有ServiceStateTracker关心RadioStateChange，它会请求RILJ去打开radio

忽略RadioAvailable的订阅者，同时也忽略CDMA，只关注GSM

GsmServiceStateTracker.java

public GsmServiceStateTracker(GSMPhone phone) {    mCi.registerForRadioStateChanged(this, EVENT_RADIO_STATE_CHANGED, null);    // system setting property AIRPLANE_MODE_ON is set in Settings.    int airplaneMode = Settings.Global.getInt(            phone.getContext().getContentResolver(),            Settings.Global.AIRPLANE_MODE_ON, 0);    mDesiredPowerState = ! (airplaneMode > 0);}case EVENT_RADIO_STATE_CHANGED:    // This will do nothing in the radio not    // available case    setPowerStateToDesired();    pollState();    break;protected void setPowerStateToDesired() {    // If we want it on and it's off, turn it on    if (mDesiredPowerState && mCi.getRadioState() == CommandsInterface.RadioState.RADIO_OFF) {        mCi.setRadioPower(true, null);    }}

第六，RILJ去和rild通信，请求打开radio：RIL_REQUEST_RADIO_POWER

注意：GSMSST虽然通过RILJ向rild发送request，但它并不关心返回的结果，所以Msg是null，它是通过订阅来得到相应的结果

setRadioPower(boolean on, Message result) {    RILRequest rr = RILRequest.obtain(RIL_REQUEST_RADIO_POWER, result);    rr.mParcel.writeInt(1);    rr.mParcel.writeInt(on ? 1 : 0);    send(rr);}

第七，rild去打开radio

通过AT命令打开radio：AT+CFUN=1

检查radio当前的状态：AT+CFUN?

最重要的是setRadioState(RADIO_STATE_ON);

它会通知到RILJ，radio状态又改变啦

RILJ向rild的每个Request，rild都会发回RESPONSE_SOLICITED给RILJ，但对于radio，RILJ不关心SOLICITE，只关心RESPONSE_UNSOLICITED

reference-ril.cstatic void onRequest (int request, void *data, size_t datalen, RIL_Token t){case RIL_REQUEST_RADIO_POWER:requestRadioPower(data, datalen, t);break;}static void requestRadioPower(void *data, size_t datalen, RIL_Token t){    int onOff = ((int *)data)[0];    if (onOff > 0 && sState == RADIO_STATE_OFF) {        err = at_send_command("AT+CFUN=1", &p_response);        if (err < 0|| p_response->success == 0) {            // Some stacks return an error when there is no SIM,            // but they really turn the RF portion on            // So, if we get an error, let's check to see if it            // turned on anyway            if (isRadioOn() != 1) {                goto error;            }        }        setRadioState(RADIO_STATE_ON);    }    at_response_free(p_response);    RIL_onRequestComplete(t, RIL_E_SUCCESS, NULL, 0);    return;}/** returns 1 if on, 0 if off, and -1 on error */static int isRadioOn(){    err = at_send_command_singleline("AT+CFUN?", "+CFUN:", &p_response);    line = p_response->p_intermediates->line;    err = at_tok_start(&line);    err = at_tok_nextbool(&line, &ret);    return (int)ret;}

第八，rild又要去通知RILJ

于之前setradio OFF不同的是，此时可以去获取SIM卡的状态啦

static void setRadioState(RIL_RadioState newState){RIL_onUnsolicitedResponse (RIL_UNSOL_RESPONSE_RADIO_STATE_CHANGED, NULL, 0);RIL_onUnsolicitedResponse (RIL_UNSOL_RESPONSE_SIM_STATUS_CHANGED, NULL, 0);if (sState == RADIO_STATE_ON) {onRadioPowerOn();}}static void onRadioPowerOn(){pollSIMState(NULL);}

第九，RILJ要把事件发给订阅radostatechanged的和radioon的

protected void setRadioState(RadioState newState) {    mRadioStateChangedRegistrants.notifyRegistrants();    if (mState.isOn() && !oldState.isOn()) {        mOnRegistrants.notifyRegistrants();    }}

但这一回，GSMSST什么也没必要干了，除了再重新去pollState()

说说关心radio avaliable的吧：GSMPhone.java

在radio avaliable之后，去获取一些重要信息：BasebandVersion，IMEI，IMEISV，RadioCapability

mCi.registerForAvailable(this, EVENT_RADIO_AVAILABLE, null);case EVENT_RADIO_AVAILABLE: {    mCi.getBasebandVersion(obtainMessage(EVENT_GET_BASEBAND_VERSION_DONE));    mCi.getIMEI(obtainMessage(EVENT_GET_IMEI_DONE));    mCi.getIMEISV(obtainMessage(EVENT_GET_IMEISV_DONE));    mCi.getRadioCapability(obtainMessage(EVENT_GET_RADIO_CAPABILITY));}

说说关心radio on的吧：UiccController.java

这是SIM卡管理的核心类，看这注释你就直到它有多重要

 * Following is class diagram for uicc classes: * *                       UiccController *                            # *                            | *                        UiccCard *                          #   # *                          |   ------------------ *                    UiccCardApplication    CatService *                      #            # *                      |            | *                 IccRecords    IccFileHandler *                 ^ ^ ^           ^ ^ ^ ^ ^ *    SIMRecords---- | |           | | | | ---SIMFileHandler *    RuimRecords----- |           | | | ----RuimFileHandler *    IsimUiccRecords---           | | -----UsimFileHandler *                                 | ------CsimFileHandler *                                 ----IsimFileHandler

可以说，所有关于SIM相关的最重要的类，都在这里管理

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