gamepad: Add wpe_gamepad_provider_get_implementator_backend()

So implementators can get access of their internal gamepad provider.

Author: ceyusa

include/wpe/gamepad.h

@@ -256,6 +256,19 @@ void wpe_gamepad_provider_start(struct wpe_gamepad_provider*);
 WPE_EXPORT
 void wpe_gamepad_provider_stop(struct wpe_gamepad_provider*);
 
+/**
+ * wpe_gamepad_provider_get_backend:
+ * @provider: opaque libwpe's representation of gamepad provider.
+ *
+ * Called by application (gamepad implementator) to access it's internal object.
+
+ * Returns: the pointer to the implementator's object.
+ *
+ * Since: 1.14
+ */
+WPE_EXPORT
+void* wpe_gamepad_provider_get_backend(struct wpe_gamepad_provider*);
+
 /**
  * wpe_gampepad_provider_get_view_backend:
  * @provider: opaque libwpe's representation of gamepad provider.

src/gamepad.c

@@ -88,6 +88,14 @@ wpe_gamepad_provider_stop(struct wpe_gamepad_provider* provider)
         provider_interface->stop(provider->backend);
 }
 
+void*
+wpe_gamepad_provider_get_backend(struct wpe_gamepad_provider* provider)
+{
+    if (provider)
+        return provider->backend;
+    return NULL;
+}
+
 struct wpe_view_backend*
 wpe_gamepad_provider_get_view_backend(struct wpe_gamepad_provider* provider, struct wpe_gamepad* gamepad)
 {