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-rw-r--r--core/jni/android_location_GpsLocationProvider.cpp293
1 files changed, 293 insertions, 0 deletions
diff --git a/core/jni/android_location_GpsLocationProvider.cpp b/core/jni/android_location_GpsLocationProvider.cpp
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+++ b/core/jni/android_location_GpsLocationProvider.cpp
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+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "GpsLocationProvider"
+
+#include "JNIHelp.h"
+#include "jni.h"
+#include "hardware/gps.h"
+#include "utils/Log.h"
+#include "utils/misc.h"
+
+#include <string.h>
+#include <pthread.h>
+
+
+static pthread_mutex_t sEventMutex = PTHREAD_MUTEX_INITIALIZER;
+static pthread_cond_t sEventCond = PTHREAD_COND_INITIALIZER;
+static jmethodID method_reportLocation;
+static jmethodID method_reportStatus;
+static jmethodID method_reportSvStatus;
+static jmethodID method_xtraDownloadRequest;
+
+static const GpsInterface* sGpsInterface = NULL;
+static const GpsXtraInterface* sGpsXtraInterface = NULL;
+
+// data written to by GPS callbacks
+static GpsLocation sGpsLocation;
+static GpsStatus sGpsStatus;
+static GpsSvStatus sGpsSvStatus;
+
+// a copy of the data shared by android_location_GpsLocationProvider_wait_for_event
+// and android_location_GpsLocationProvider_read_status
+static GpsLocation sGpsLocationCopy;
+static GpsStatus sGpsStatusCopy;
+static GpsSvStatus sGpsSvStatusCopy;
+
+enum CallbackType {
+ kLocation = 1,
+ kStatus = 2,
+ kSvStatus = 4,
+ kXtraDownloadRequest = 8,
+ kDisableRequest = 16,
+};
+static int sPendingCallbacks;
+
+namespace android {
+
+static void location_callback(GpsLocation* location)
+{
+ pthread_mutex_lock(&sEventMutex);
+
+ sPendingCallbacks |= kLocation;
+ memcpy(&sGpsLocation, location, sizeof(sGpsLocation));
+
+ pthread_cond_signal(&sEventCond);
+ pthread_mutex_unlock(&sEventMutex);
+}
+
+static void status_callback(GpsStatus* status)
+{
+ pthread_mutex_lock(&sEventMutex);
+
+ sPendingCallbacks |= kStatus;
+ memcpy(&sGpsStatus, status, sizeof(sGpsStatus));
+
+ pthread_cond_signal(&sEventCond);
+ pthread_mutex_unlock(&sEventMutex);
+}
+
+static void sv_status_callback(GpsSvStatus* sv_status)
+{
+ pthread_mutex_lock(&sEventMutex);
+
+ sPendingCallbacks |= kSvStatus;
+ memcpy(&sGpsSvStatus, sv_status, sizeof(GpsSvStatus));
+
+ pthread_cond_signal(&sEventCond);
+ pthread_mutex_unlock(&sEventMutex);
+}
+
+GpsCallbacks sGpsCallbacks = {
+ location_callback,
+ status_callback,
+ sv_status_callback,
+};
+
+static void
+download_request_callback()
+{
+ pthread_mutex_lock(&sEventMutex);
+ sPendingCallbacks |= kXtraDownloadRequest;
+ pthread_cond_signal(&sEventCond);
+ pthread_mutex_unlock(&sEventMutex);
+}
+
+GpsXtraCallbacks sGpsXtraCallbacks = {
+ download_request_callback,
+};
+
+
+static void android_location_GpsLocationProvider_class_init_native(JNIEnv* env, jclass clazz) {
+ method_reportLocation = env->GetMethodID(clazz, "reportLocation", "(IDDDFFFJ)V");
+ method_reportStatus = env->GetMethodID(clazz, "reportStatus", "(I)V");
+ method_reportSvStatus = env->GetMethodID(clazz, "reportSvStatus", "()V");
+ method_xtraDownloadRequest = env->GetMethodID(clazz, "xtraDownloadRequest", "()V");
+}
+
+static jboolean android_location_GpsLocationProvider_is_supported(JNIEnv* env, jclass clazz) {
+ if (!sGpsInterface)
+ sGpsInterface = gps_get_interface();
+ return (sGpsInterface != NULL);
+}
+
+static jboolean android_location_GpsLocationProvider_init(JNIEnv* env, jobject obj)
+{
+ if (!sGpsInterface)
+ sGpsInterface = gps_get_interface();
+ return (sGpsInterface && sGpsInterface->init(&sGpsCallbacks) == 0);
+}
+
+static void android_location_GpsLocationProvider_disable(JNIEnv* env, jobject obj)
+{
+ pthread_mutex_lock(&sEventMutex);
+ sPendingCallbacks |= kDisableRequest;
+ pthread_cond_signal(&sEventCond);
+ pthread_mutex_unlock(&sEventMutex);
+}
+
+static void android_location_GpsLocationProvider_cleanup(JNIEnv* env, jobject obj)
+{
+ sGpsInterface->cleanup();
+}
+
+static jboolean android_location_GpsLocationProvider_start(JNIEnv* env, jobject obj, jboolean singleFix, jint fixFrequency)
+{
+ int result = sGpsInterface->set_position_mode(GPS_POSITION_MODE_STANDALONE, (singleFix ? 0 : fixFrequency));
+ if (result) {
+ return result;
+ }
+
+ return (sGpsInterface->start() == 0);
+}
+
+static jboolean android_location_GpsLocationProvider_stop(JNIEnv* env, jobject obj)
+{
+ return (sGpsInterface->stop() == 0);
+}
+
+static void android_location_GpsLocationProvider_set_fix_frequency(JNIEnv* env, jobject obj, jint fixFrequency)
+{
+ if (sGpsInterface->set_fix_frequency)
+ sGpsInterface->set_fix_frequency(fixFrequency);
+}
+
+static void android_location_GpsLocationProvider_delete_aiding_data(JNIEnv* env, jobject obj, jint flags)
+{
+ sGpsInterface->delete_aiding_data(flags);
+}
+
+static void android_location_GpsLocationProvider_wait_for_event(JNIEnv* env, jobject obj)
+{
+ pthread_mutex_lock(&sEventMutex);
+ pthread_cond_wait(&sEventCond, &sEventMutex);
+
+ // copy and clear the callback flags
+ int pendingCallbacks = sPendingCallbacks;
+ sPendingCallbacks = 0;
+
+ // copy everything and unlock the mutex before calling into Java code to avoid the possibility
+ // of timeouts in the GPS engine.
+ memcpy(&sGpsLocationCopy, &sGpsLocation, sizeof(sGpsLocationCopy));
+ memcpy(&sGpsStatusCopy, &sGpsStatus, sizeof(sGpsStatusCopy));
+ memcpy(&sGpsSvStatusCopy, &sGpsSvStatus, sizeof(sGpsSvStatusCopy));
+ pthread_mutex_unlock(&sEventMutex);
+
+ if (pendingCallbacks & kLocation) {
+ env->CallVoidMethod(obj, method_reportLocation, sGpsLocationCopy.flags,
+ (jdouble)sGpsLocationCopy.latitude, (jdouble)sGpsLocationCopy.longitude,
+ (jdouble)sGpsLocationCopy.altitude,
+ (jfloat)sGpsLocationCopy.speed, (jfloat)sGpsLocationCopy.bearing,
+ (jfloat)sGpsLocationCopy.accuracy, (jlong)sGpsLocationCopy.timestamp);
+ }
+ if (pendingCallbacks & kStatus) {
+ env->CallVoidMethod(obj, method_reportStatus, sGpsStatusCopy.status);
+ }
+ if (pendingCallbacks & kSvStatus) {
+ env->CallVoidMethod(obj, method_reportSvStatus);
+ }
+ if (pendingCallbacks & kXtraDownloadRequest) {
+ env->CallVoidMethod(obj, method_xtraDownloadRequest);
+ }
+ if (pendingCallbacks & kDisableRequest) {
+ // don't need to do anything - we are just poking so wait_for_event will return.
+ }
+}
+
+static jint android_location_GpsLocationProvider_read_sv_status(JNIEnv* env, jobject obj,
+ jintArray prnArray, jfloatArray snrArray, jfloatArray elevArray, jfloatArray azumArray,
+ jintArray maskArray)
+{
+ // this should only be called from within a call to reportStatus, so we don't need to lock here
+
+ jint* prns = env->GetIntArrayElements(prnArray, 0);
+ jfloat* snrs = env->GetFloatArrayElements(snrArray, 0);
+ jfloat* elev = env->GetFloatArrayElements(elevArray, 0);
+ jfloat* azim = env->GetFloatArrayElements(azumArray, 0);
+ jint* mask = env->GetIntArrayElements(maskArray, 0);
+
+ int num_svs = sGpsSvStatusCopy.num_svs;
+ for (int i = 0; i < num_svs; i++) {
+ prns[i] = sGpsSvStatusCopy.sv_list[i].prn;
+ snrs[i] = sGpsSvStatusCopy.sv_list[i].snr;
+ elev[i] = sGpsSvStatusCopy.sv_list[i].elevation;
+ azim[i] = sGpsSvStatusCopy.sv_list[i].azimuth;
+ }
+ mask[0] = sGpsSvStatusCopy.ephemeris_mask;
+ mask[1] = sGpsSvStatusCopy.almanac_mask;
+ mask[2] = sGpsSvStatusCopy.used_in_fix_mask;
+
+ env->ReleaseIntArrayElements(prnArray, prns, 0);
+ env->ReleaseFloatArrayElements(snrArray, snrs, 0);
+ env->ReleaseFloatArrayElements(elevArray, elev, 0);
+ env->ReleaseFloatArrayElements(azumArray, azim, 0);
+ env->ReleaseIntArrayElements(maskArray, mask, 0);
+ return num_svs;
+}
+
+static void android_location_GpsLocationProvider_inject_time(JNIEnv* env, jobject obj, jlong time,
+ jlong timeReference, jint uncertainty)
+{
+ sGpsInterface->inject_time(time, timeReference, uncertainty);
+}
+
+static jboolean android_location_GpsLocationProvider_supports_xtra(JNIEnv* env, jobject obj)
+{
+ if (!sGpsXtraInterface) {
+ sGpsXtraInterface = (const GpsXtraInterface*)sGpsInterface->get_extension(GPS_XTRA_INTERFACE);
+ if (sGpsXtraInterface) {
+ int result = sGpsXtraInterface->init(&sGpsXtraCallbacks);
+ if (result) {
+ sGpsXtraInterface = NULL;
+ }
+ }
+ }
+
+ return (sGpsXtraInterface != NULL);
+}
+
+static void android_location_GpsLocationProvider_inject_xtra_data(JNIEnv* env, jobject obj,
+ jbyteArray data, jint length)
+{
+ jbyte* bytes = env->GetByteArrayElements(data, 0);
+ sGpsXtraInterface->inject_xtra_data((char *)bytes, length);
+ env->ReleaseByteArrayElements(data, bytes, 0);
+}
+
+static JNINativeMethod sMethods[] = {
+ /* name, signature, funcPtr */
+ {"class_init_native", "()V", (void *)android_location_GpsLocationProvider_class_init_native},
+ {"native_is_supported", "()Z", (void*)android_location_GpsLocationProvider_is_supported},
+ {"native_init", "()Z", (void*)android_location_GpsLocationProvider_init},
+ {"native_disable", "()V", (void*)android_location_GpsLocationProvider_disable},
+ {"native_cleanup", "()V", (void*)android_location_GpsLocationProvider_cleanup},
+ {"native_start", "(ZI)Z", (void*)android_location_GpsLocationProvider_start},
+ {"native_stop", "()Z", (void*)android_location_GpsLocationProvider_stop},
+ {"native_set_fix_frequency", "(I)V", (void*)android_location_GpsLocationProvider_set_fix_frequency},
+ {"native_delete_aiding_data", "(I)V", (void*)android_location_GpsLocationProvider_delete_aiding_data},
+ {"native_wait_for_event", "()V", (void*)android_location_GpsLocationProvider_wait_for_event},
+ {"native_read_sv_status", "([I[F[F[F[I)I", (void*)android_location_GpsLocationProvider_read_sv_status},
+ {"native_inject_time", "(JJI)V", (void*)android_location_GpsLocationProvider_inject_time},
+ {"native_supports_xtra", "()Z", (void*)android_location_GpsLocationProvider_supports_xtra},
+ {"native_inject_xtra_data", "([BI)V", (void*)android_location_GpsLocationProvider_inject_xtra_data},
+};
+
+int register_android_location_GpsLocationProvider(JNIEnv* env)
+{
+ return jniRegisterNativeMethods(env, "com/android/internal/location/GpsLocationProvider", sMethods, NELEM(sMethods));
+}
+
+} /* namespace android */
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