qcom android GPS 启动流程
2024-04-18 12:42:39
1 LocationManagerService启动及初始化过程
(1) 在SystemServer.java的startOtherServices中添加LocationManagerService的代码如下：
try {location = new LocationManagerService(context);ServiceManager.addService(Context.LOCATION_SERVICE, location);
} catch (Throwable e) {reportWtf("starting Location Manager", e);
}(2) 在systemReady中调用systemRunning, 启动LocationManagerService的代码如下：
try {if (locationF != null) locationF.systemRunning();
} catch (Throwable e) {reportWtf("Notifying Location Service running", e);
}(3) 准备GnssLocationProvider，LocationManagerService的systemRunning函数中会调用 loadProvidersLocked， 其代码如下：
private void loadProvidersLocked() { // create a passive location provider, which is always enabledPassiveProvider passiveProvider = new PassiveProvider(this);addProviderLocked(passiveProvider);mEnabledProviders.add(passiveProvider.getName());mPassiveProvider = passiveProvider;if (GnssLocationProvider.isSupported()) {// Create a gps location providerGnssLocationProvider gnssProvider = new GnssLocationProvider(mContext, this,mLocationHandler.getLooper());mGnssSystemInfoProvider = gnssProvider.getGnssSystemInfoProvider();......}......
}(4) GnssLocationProvider的class_init_native方法。
该方法是一个静态方法，会在isSupported方法之前被调用。最终会调用到native函数中：android_location_GnssLocationProvider_class_init_native。
在这个函数中实现对gps.default.so的加载。
static void android_location_GnssLocationProvider_class_init_native(JNIEnv* env, jclass clazz) {int err;hw_module_t* module;.......err = hw_get_module(GPS_HARDWARE_MODULE_ID, (hw_module_t const**)&module);if (err == 0) {hw_device_t* device;err = module->methods->open(module, GPS_HARDWARE_MODULE_ID, &device);if (err == 0) {gps_device_t* gps_device = (gps_device_t *)device;sGpsInterface = gps_device->get_gps_interface(gps_device);}}if (sGpsInterface) {......}
}(5) sGpsInterface 接口：
static const GpsInterface sLocEngInterface =
{sizeof(GpsInterface),loc_init,loc_start,loc_stop,loc_cleanup,loc_inject_time,loc_inject_location,loc_delete_aiding_data,loc_set_position_mode,loc_get_extension
};(6) Others interface:
具体实现请参考：/LINUX/android/hardware/qcom/gps/loc_api/libloc_api_50001/loc.cpp
if (sGpsInterface) {sGpsXtraInterface =(const GpsXtraInterface*)sGpsInterface->get_extension(GPS_XTRA_INTERFACE);sAGpsInterface =(const AGpsInterface*)sGpsInterface->get_extension(AGPS_INTERFACE);sGpsNiInterface =(const GpsNiInterface*)sGpsInterface->get_extension(GPS_NI_INTERFACE);sGpsDebugInterface =(const GpsDebugInterface*)sGpsInterface->get_extension(GPS_DEBUG_INTERFACE);sAGpsRilInterface =(const AGpsRilInterface*)sGpsInterface->get_extension(AGPS_RIL_INTERFACE);sGpsGeofencingInterface =(const GpsGeofencingInterface*)sGpsInterface->get_extension(GPS_GEOFENCING_INTERFACE);sGpsMeasurementInterface =(const GpsMeasurementInterface*)sGpsInterface->get_extension(GPS_MEASUREMENT_INTERFACE);sGpsNavigationMessageInterface =(const GpsNavigationMessageInterface*)sGpsInterface->get_extension(GPS_NAVIGATION_MESSAGE_INTERFACE);sGnssConfigurationInterface =(const GnssConfigurationInterface*)sGpsInterface->get_extension(GNSS_CONFIGURATION_INTERFACE);
}(7) GPS framework 回调函数库：
GpsCallbacks sGpsCallbacks = {sizeof(GpsCallbacks),location_callback,status_callback,sv_status_callback,nmea_callback,set_capabilities_callback,acquire_wakelock_callback,release_wakelock_callback,create_thread_callback,request_utc_time_callback,set_system_info_callback,gnss_sv_status_callback,
};GpsXtraCallbacks sGpsXtraCallbacks = {xtra_download_request_callback,create_thread_callback,
};AGpsCallbacks sAGpsCallbacks = {agps_status_callback,create_thread_callback,
};GpsNiCallbacks sGpsNiCallbacks = {gps_ni_notify_callback,create_thread_callback,
};AGpsRilCallbacks sAGpsRilCallbacks = {agps_request_set_id,agps_request_ref_location,create_thread_callback,
};......2 GPS启动流程
(1) GnssLocationProvider.java里处理GPS启动，关闭请求
@Override public void handleMessage(Message msg) {int message = msg.what;switch (message) {case ENABLE:if (msg.arg1 == 1) {handleEnable();} else {handleDisable();}break;......}
}(2) handleEnable里启动native层初始化动作
private void handleEnable() {if (DEBUG) Log.d(TAG, "handleEnable");synchronized (mLock) {if (mEnabled) return;mEnabled = true;}boolean enabled = native_init();if (enabled) {mSupportsXtra = true;} else {synchronized (mLock) {mEnabled = false;}Log.w(TAG, "Failed to enable location provider");}
}(3) GPS native初始化，即GnssLocationProvider初始化过程：
static jboolean android_location_GnssLocationProvider_init(JNIEnv* env, jobject obj){// this must be set before calling into the HAL libraryif (!mCallbacksObj)mCallbacksObj = env->NewGlobalRef(obj);// fail if the main interface fails to initializeif (!sGpsInterface || sGpsInterface->init(&sGpsCallbacks) != 0)return JNI_FALSE;// if XTRA initialization fails we will disable it by sGpsXtraInterface to NULL,// but continue to allow the rest of the GPS interface to work.if (sGpsXtraInterface && sGpsXtraInterface->init(&sGpsXtraCallbacks) != 0)sGpsXtraInterface = NULL;......return JNI_TRUE;
}(4) Loc_init, 设置framework层回调函数，初始化loc eng，并通过modem接口上电：
static int loc_init(GpsCallbacks* callbacks){int retVal = -1;ENTRY_LOG();LOC_API_ADAPTER_EVENT_MASK_T event;......LocCallbacks clientCallbacks = {local_loc_cb, /* location_cb */callbacks->status_cb, /* status_cb */local_sv_cb, /* sv_status_cb */callbacks->nmea_cb, /* nmea_cb */callbacks->set_capabilities_cb, /* set_capabilities_cb */callbacks->acquire_wakelock_cb, /* acquire_wakelock_cb */callbacks->release_wakelock_cb, /* release_wakelock_cb */callbacks->create_thread_cb, /* create_thread_cb */NULL, /* location_ext_parser */NULL, /* sv_ext_parser */callbacks->request_utc_time_cb, /* request_utc_time_cb */callbacks->set_system_info_cb, /* set_system_info_cb */callbacks->gnss_sv_status_cb, /* gnss_sv_status_cb */};gps_loc_cb = callbacks->location_cb;gps_sv_cb = callbacks->sv_status_cb;retVal = loc_eng_init(loc_afw_data, &clientCallbacks, event, NULL);......if(retVal) {LOC_LOGE("loc_eng_init() fail!");goto err;}loc_afw_data.adapter->setPowerVoteRight(loc_get_target() == TARGET_QCA1530);loc_afw_data.adapter->setPowerVote(true);LOC_LOGD("loc_eng_init() success!");err:EXIT_LOG(%d, retVal);return retVal;
}(5) LocEngInit及msgTask初始化流程：
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