Get into Android HAL Architecture With Exampls

AGPS_INTERFACE : AGPS  -> Aiding / Assisted GPS (A-GPS) (in ublox gps module)

 frameworksaseservicesjavacomandroidserverlocationGpsLocationProvider.java

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frameworksaseservicesjnicom_android_server_location_GpsLocationProvider.cpp

                      err = hw_get_module(GPS_HARDWARE_MODULE_ID, (hw_module_t const**)&module);

                      err = module->methods->open(module, GPS_HARDWARE_MODULE_ID, &device);

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hardwareimxlibgpsgps.c

const GpsInterface* gps__get_gps_interface(struct gps_device_t* dev)
{
return gps_get_hardware_interface();

}

static int open_gps(const struct hw_module_t* module, char const* name, struct hw_device_t** device)
{
struct gps_device_t *dev = malloc(sizeof(struct gps_device_t));
memset(dev, 0, sizeof(*dev));

dev->common.tag = HARDWARE_DEVICE_TAG;
dev->common.version = 0;
dev->common.module = (struct hw_module_t*)module;
dev->get_gps_interface = gps__get_gps_interface;

*device = (struct hw_device_t*)dev;
return 0;
}

static struct hw_module_methods_t gps_module_methods = {
.open = open_gps
};

struct hw_module_t HAL_MODULE_INFO_SYM = {
.tag = HARDWARE_MODULE_TAG,
.version_major = 1,
.version_minor = 0,
.id = GPS_HARDWARE_MODULE_ID,
.name = "Atheros GPS Module",
.author = "FSL MAD, Inc.",
.methods = &gps_module_methods,
};

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hardwareimxlibgpsathr_gps.c

static const GpsInterface athrGpsInterface = {
.size =sizeof(GpsInterface),
.init = athr_gps_init,
.start = athr_gps_start,
.stop = athr_gps_stop,
.cleanup = athr_gps_cleanup,
.inject_time = athr_gps_inject_time,
.inject_location = athr_gps_inject_location,
.delete_aiding_data = athr_gps_delete_aiding_data,
.set_position_mode = athr_gps_set_position_mode,
.get_extension = athr_gps_get_extension,
};

const GpsInterface* gps_get_hardware_interface()
{
return &athrGpsInterface;
}