diff --git a/gphoto2/gphoto2-setting.h b/gphoto2/gphoto2-setting.h
index 34c6d8942..b6af5f2a4 100644
--- a/gphoto2/gphoto2-setting.h
+++ b/gphoto2/gphoto2-setting.h
@@ -28,6 +28,9 @@
 extern "C" {
 #endif /* __cplusplus */
 
+typedef int(*gp_settings_func)(char*,char*,char*,void*);
+void gp_setting_set_get_func (gp_settings_func func, void *userdata);
+void gp_setting_set_set_func (gp_settings_func func, void *userdata);
 int gp_setting_set (char *id, char *key, char *value);
 int gp_setting_get (char *id, char *key, char *value);
 
diff --git a/libgphoto2/gphoto2-setting.c b/libgphoto2/gphoto2-setting.c
index 52c3ce169..370a1220d 100644
--- a/libgphoto2/gphoto2-setting.c
+++ b/libgphoto2/gphoto2-setting.c
@@ -61,6 +61,39 @@ static int save_settings (void);
 
 static int load_settings (void);
 
+static void *get_func_userdata = NULL;
+static void *set_func_userdata = NULL;
+static gp_settings_func custom_get_func = NULL;
+static gp_settings_func custom_set_func = NULL;
+
+/**
+ * \brief Set user defined function to get a gphoto setting.
+ * \param func The function to get the settings
+ * \param userdata userdata passed to func
+ *
+ * This function is expected to behave like gp_settings_get.
+ * To clear set func to NULL.
+ */
+void gp_setting_set_get_func (gp_settings_func func, void *userdata)
+{
+	custom_get_func = func;
+	get_func_userdata = userdata;
+}
+
+/**
+ * \brief Set user defined function to set a gphoto setting.
+ * \param func The function to set the settings
+ * \param userdata userdata passed to func
+ *
+ * This function is expected to behave like gp_settings_set.
+ * To clear set func to NULL.
+ */
+void gp_setting_set_set_func (gp_settings_func func, void *userdata)
+{
+	custom_set_func = func;
+	set_func_userdata = userdata;
+}
+
 /**
  * \brief Retrieve a specific gphoto setting.
  * \param id the frontend id of the caller
@@ -74,6 +107,9 @@ static int load_settings (void);
 int
 gp_setting_get (char *id, char *key, char *value)
 {
+	if (custom_get_func != NULL)
+		return custom_get_func(id, key, value, get_func_userdata);
+
 	int x;
 
 	C_PARAMS (id && key);
@@ -106,6 +142,9 @@ gp_setting_get (char *id, char *key, char *value)
 int
 gp_setting_set (char *id, char *key, char *value)
 {
+	if (custom_set_func != NULL)
+		return custom_set_func(id, key, value, set_func_userdata);
+
 	int x;
 
 	C_PARAMS (id && key);
diff --git a/libgphoto2/libgphoto2.sym b/libgphoto2/libgphoto2.sym
index bcb951cc4..d53f8043a 100644
--- a/libgphoto2/libgphoto2.sym
+++ b/libgphoto2/libgphoto2.sym
@@ -140,6 +140,8 @@ gp_list_sort
 gp_list_unref
 gp_message_codeset
 gp_result_as_string
+gp_setting_set_get_func
+gp_setting_set_set_func
 gp_setting_get
 gp_setting_set
 gp_widget_add_choice