diff --git a/src/meson.build b/src/meson.build
index f916890..e0fe1f4 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -25,6 +25,7 @@ sources = [
   'accel-mount-matrix.c',
   'accel-scale.c',
   'accel-attributes.c',
+  'utils.c',
   resources,
 ]
 
diff --git a/src/utils.c b/src/utils.c
new file mode 100644
index 0000000..5ea4287
--- /dev/null
+++ b/src/utils.c
@@ -0,0 +1,21 @@
+/*
+ * Copyright (c) 2021 Bastien Nocera <hadess@hadess.net>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 3 as published by
+ * the Free Software Foundation.
+ *
+ */
+
+#include "utils.h"
+
+char *
+get_device_file (GUdevDevice *device)
+{
+	if (!IS_TEST)
+		return g_udev_device_get_device_file (device);
+
+	return g_build_filename (g_getenv ("UMOCKDEV_DIR"),
+				 "iio-dev-data.bin",
+				 NULL);
+}
diff --git a/src/utils.h b/src/utils.h
index 0109a1b..a117d51 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -10,5 +10,8 @@
 #pragma once
 
 #include <glib.h>
+#include <gudev/gudev.h>
 
 #define IS_TEST (g_getenv ("UMOCKDEV_DIR") != NULL)
+
+char *get_device_file (GUdevDevice *device);