Added mouse DPI interface

src/device/device.h

@@ -2,6 +2,10 @@
 #define DEVICE_H
 
 #include <stdlib.h>
+#include <dlfcn.h>
+
+#include "driver_interface.h"
+
 #include "utils/array.h"
 
 typedef struct DEVICE device_t;
@@ -11,6 +15,8 @@ void device_init();
 array_t* device_get_array();
 
 // Handling a single device
+void* device_handle(device_t* device);
+void* device_driver(device_t* device);
 device_t* device_register(void* driver, void* handle);
 char* device_get_image(device_t* device);
 char* device_get_name(device_t* device);