dynamically build and load adapter libs

This is to support bringup efforts. This change will decouple
the dependencies between GPS HAL and proprietary QMI headers,
so that we can build HAL without any proprietary repos.

Change-Id: I7b836d09f4ac6b1a1bdb38f8d6a2bfb90bb5bf01
Signed-off-by: Iliyan Malchev <malchev@google.com>

loc_api/Android.mk

@@ -12,6 +12,8 @@ LOCAL_PATH := $(call my-dir)
 
 GPS_DIR_LIST :=
 
+ifeq (exists, $(shell test -d $(TOP)/vendor/qcom/proprietary/qmi-frameworks && echo exists))
+
 # add RPC dirs if RPC is available
 ifneq ($(TARGET_NO_RPC),true)
 
@@ -25,6 +27,8 @@ GPS_DIR_LIST += $(LOCAL_PATH)/loc_api_v02/
 
 endif #TARGET_NO_RPC
 
+endif
+
 GPS_DIR_LIST += $(LOCAL_PATH)/libloc_api_50001/
 
 #call the subfolders

loc_api/libloc_api-rpc-50001/libloc_api-rpc-glue/src/LocApiRpcAdapter.cpp

@@ -98,7 +98,7 @@ static void loc_rpc_global_cb(void* user, CLIENT* clnt, enum rpc_reset_event eve
 }
 
 
-LocApiAdapter* getLocApiAdapter(LocEng &locEng)
+extern "C" LocApiAdapter* getLocApiAdapter(LocEng &locEng)
 {
     return new LocApiRpcAdapter(locEng);
 }

loc_api/libloc_api_50001/Android.mk

@@ -18,7 +18,8 @@ LOCAL_MODULE_TAGS := optional
 LOCAL_SHARED_LIBRARIES := \
     libutils \
     libcutils \
-    libgps.utils
+    libgps.utils \
+    libdl
 
 LOCAL_SRC_FILES += \
     loc_eng_log.cpp \
@@ -78,13 +79,6 @@ LOCAL_SRC_FILES += \
     loc_eng_dmn_conn_glue_msg.c \
     loc_eng_dmn_conn_glue_pipe.c
 
-## Check if RPC is not unsupported
-ifneq ($(TARGET_NO_RPC),true)
-LOCAL_SHARED_LIBRARIES += libloc_api-rpc-qc
-else
-LOCAL_SHARED_LIBRARIES += libloc_api_v02
-endif #TARGET_NO_RPC
-
 LOCAL_CFLAGS += \
      -fno-short-enums \
      -D_ANDROID_

loc_api/libloc_api_50001/LocApiAdapter.cpp

@@ -29,6 +29,7 @@
 #define LOG_NDDEBUG 0
 #define LOG_TAG "LocSvc_adapter"
 
+#include <dlfcn.h>
 #include <LocApiAdapter.h>
 #include "loc_eng_msg.h"
 #include "loc_log.h"
@@ -66,6 +67,35 @@ LocApiAdapter::~LocApiAdapter()
     LOC_LOGV("LocApiAdapter deleted");
 }
 
+LocApiAdapter* LocApiAdapter::getLocApiAdapter(LocEng &locEng)
+{
+    void* handle;
+    LocApiAdapter* adapter = NULL;
+
+    handle = dlopen ("libloc_api_v02.so", RTLD_NOW);
+
+    if (!handle) {
+        LOC_LOGI("%s: dlopen(libloc_api_v02.so) failed, trying to load libloc_api-rpc-qc.so", __FUNCTION__);
+        handle = dlopen ("libloc_api-rpc-qc.so", RTLD_NOW);
+    }
+    else
+        LOC_LOGE("%s: dlopen(libloc_api_v02.so) succeeded.", __FUNCTION__);
+
+    if (!handle) {
+        LOC_LOGI("%s: dlopen(libloc_api-rpc-qc.so) failed, constructing LocApiAdapter", __FUNCTION__);
+        adapter = new LocApiAdapter(locEng);
+    } else {
+        getLocApiAdapter_t* getHandle = (getLocApiAdapter_t*)dlsym(handle, "getLocApiAdapter");
+        if (!getHandle) {
+            LOC_LOGE("%s: dlsym(getLocApiAdapter) failed", __FUNCTION__);
+            return NULL;
+        }
+        adapter = (*getHandle)(locEng);
+    }
+
+    return adapter;
+}
+
 int LocApiAdapter::hexcode(char *hexstring, int string_size,
                         const char *data, int data_size)
 {

loc_api/libloc_api_50001/LocApiAdapter.h

@@ -107,6 +107,8 @@ public:
     //LocApiAdapter(int q, reportCb_t[LOC_API_ADAPTER_EVENT_MAX] callbackTable);
     virtual ~LocApiAdapter();
 
+    static LocApiAdapter* getLocApiAdapter(LocEng &locEng);
+
     static int hexcode(char *hexstring, int string_size,
                        const char *data, int data_size);
     static int decodeAddress(char *addr_string, int string_size,
@@ -199,7 +201,8 @@ public:
     {LOC_LOGW("%s: default implementation invoked", __func__); return LOC_API_ADAPTER_ERR_SUCCESS;}
 };
 
-LocApiAdapter* getLocApiAdapter(LocEng &locEng);
+extern "C" LocApiAdapter* getLocApiAdapter(LocEng &locEng);
 
+typedef LocApiAdapter* (getLocApiAdapter_t)(LocEng&);
 
 #endif //LOC_API_RPC_ADAPTER_H

loc_api/libloc_api_50001/loc_eng.cpp

@@ -265,7 +265,7 @@ int loc_eng_init(loc_eng_data_s_type &loc_eng_data, LocCallbacks* callbacks,
     LocEng locEngHandle(&loc_eng_data, event, loc_eng_data.acquire_wakelock_cb,
                         loc_eng_data.release_wakelock_cb, loc_eng_msg_sender,
                         callbacks->location_ext_parser, callbacks->sv_ext_parser);
-    loc_eng_data.client_handle = getLocApiAdapter(locEngHandle);
+    loc_eng_data.client_handle = LocApiAdapter::getLocApiAdapter(locEngHandle);
 
     int ret_val =-1;
     if (NULL == loc_eng_data.client_handle) {

loc_api/loc_api_v02/LocApiV02Adapter.cpp

@@ -2053,7 +2053,7 @@ void LocApiV02Adapter :: errorCb(locClientHandleType handle,
 }
 
 /* return a Loc API adapter */
-LocApiAdapter* getLocApiAdapter(LocEng &locEng)
+extern "C" LocApiAdapter* getLocApiAdapter(LocEng &locEng)
 {
  return(new LocApiV02Adapter(locEng));
 }