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/******************************************************************************
* GPS HAL wrapper
* wrapps around Samsung GPS Libary and replaces a faulty pointer to
* a faulty function from Samsung that will cause the system_server
* to crash.
*
* Copyright 2010 - Kolja Dummann
*
* 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.
*
******************************************************************************/
#include <hardware/hardware.h>
#include <hardware/gps.h>
#include <errno.h>
#include <dlfcn.h>
//#define ALOG_NDEBUG 0
#include <stdlib.h>
#define ALOG_TAG "gps-wrapper"
#include <utils/Log.h>
#define ORIGINAL_HAL_PATH "/system/lib/hw/vendor-gps.exynos4.so"
static const AGpsRilInterface* oldAGPSRIL = NULL;
static AGpsRilInterface newAGPSRIL;
static const GpsInterface* originalGpsInterface = NULL;
static GpsInterface newGpsInterface;
/**
* Load the file defined by the variant and if successful
* return the dlopen handle and the hmi.
* @return 0 = success, !0 = failure.
*/
static int load(const char *id,
const char *path,
const struct hw_module_t **pHmi)
{
int status;
void *handle;
struct hw_module_t *hmi;
/*
* load the symbols resolving undefined symbols before
* dlopen returns. Since RTLD_GLOBAL is not or'd in with
* RTLD_NOW the external symbols will not be global
*/
handle = dlopen(path, RTLD_NOW);
if (handle == NULL) {
char const *err_str = dlerror();
ALOGE("load: module=%s\n%s", path, err_str?err_str:"unknown");
status = -EINVAL;
goto done;
}
/* Get the address of the struct hal_module_info. */
const char *sym = HAL_MODULE_INFO_SYM_AS_STR;
hmi = (struct hw_module_t *)dlsym(handle, sym);
if (hmi == NULL) {
ALOGE("load: couldn't find symbol %s", sym);
status = -EINVAL;
goto done;
}
/* Check that the id matches */
if (strcmp(id, hmi->id) != 0) {
ALOGE("load: id=%s != hmi->id=%s", id, hmi->id);
status = -EINVAL;
goto done;
}
hmi->dso = handle;
/* success */
status = 0;
done:
if (status != 0) {
hmi = NULL;
if (handle != NULL) {
dlclose(handle);
handle = NULL;
}
} else {
ALOGV("loaded HAL id=%s path=%s hmi=%p handle=%p",
id, path, *pHmi, handle);
}
*pHmi = hmi;
return status;
}
static void update_network_state_wrapper(int connected, int type, int roaming, const char* extra_info)
{
ALOGI("%s was called and saved your from a faulty implementation ;-)", __func__);
}
static const void* wrapper_get_extension(const char* name)
{
ALOGV("%s was called", __func__);
if (!strcmp(name, AGPS_RIL_INTERFACE) && (oldAGPSRIL = originalGpsInterface->get_extension(name)))
{
ALOGV("%s AGPS_RIL_INTERFACE extension requested", __func__);
/* use a wrapper to avoid calling samsungs faulty implemetation */
newAGPSRIL.size = sizeof(AGpsRilInterface);
newAGPSRIL.init = oldAGPSRIL->init;
newAGPSRIL.set_ref_location = oldAGPSRIL->set_ref_location;
newAGPSRIL.set_set_id = oldAGPSRIL->set_set_id;
newAGPSRIL.ni_message = oldAGPSRIL->ni_message;
ALOGV("%s setting update_network_state_wrapper", __func__);
newAGPSRIL.update_network_state = update_network_state_wrapper;
return &newAGPSRIL;
}
return originalGpsInterface->get_extension(name);
}
/* HAL Methods */
const GpsInterface* gps_get_gps_interface(struct gps_device_t* dev)
{
hw_module_t* module;
int err;
ALOGV("%s was called", __func__);
err = load(GPS_HARDWARE_MODULE_ID, ORIGINAL_HAL_PATH, (hw_module_t const**)&module);
if (err == 0) {
ALOGV("%s vendor lib loaded", __func__);
hw_device_t* device;
struct gps_device_t *gps_device;
err = module->methods->open(module, GPS_HARDWARE_MODULE_ID, &device);
if (err == 0) {
ALOGV("%s got gps device", __func__);
gps_device = (struct gps_device_t *)device;
originalGpsInterface = gps_device->get_gps_interface(gps_device);
ALOGV("%s device set", __func__);
}
}
if(originalGpsInterface)
{
ALOGV("%s exposing callbacks", __func__);
newGpsInterface.size = sizeof(GpsInterface);
newGpsInterface.init = originalGpsInterface->init;
newGpsInterface.start = originalGpsInterface->start;
newGpsInterface.stop = originalGpsInterface->stop;
newGpsInterface.cleanup = originalGpsInterface->cleanup;
newGpsInterface.inject_time = originalGpsInterface->inject_time;
newGpsInterface.inject_location = originalGpsInterface->inject_location;
newGpsInterface.delete_aiding_data = originalGpsInterface->delete_aiding_data;
newGpsInterface.set_position_mode = originalGpsInterface->set_position_mode;
ALOGV("%s setting extension wrapper", __func__);
newGpsInterface.get_extension = wrapper_get_extension;
}
ALOGV("%s done", __func__);
return &newGpsInterface;
}
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));
ALOGV("%s was called", __func__);
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
};
const struct hw_module_t HAL_MODULE_INFO_SYM = {
.tag = HARDWARE_MODULE_TAG,
.version_major = 1,
.version_minor = 0,
.id = GPS_HARDWARE_MODULE_ID,
.name = "GPS HAL Wrapper Module",
.author = "Kolja Dummann",
.methods = &gps_module_methods,
};
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