From 7af516a6186288e8f60eedb3406a465fd52697d9 Mon Sep 17 00:00:00 2001
From: Hauke Petersen <hauke.petersen@fu-berlin.de>
Date: Wed, 21 Nov 2018 14:15:37 +0100
Subject: [PATCH 1/3] netdev: add funcs for declaring get/set as notsup

This commit adds two convenience functions that allow to declare
get() and/or set() as not supported when declaring a
netdev_driver struct.
---
 drivers/include/net/netdev.h | 42 ++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/drivers/include/net/netdev.h b/drivers/include/net/netdev.h
index f27e6c791f..3bbf429510 100644
--- a/drivers/include/net/netdev.h
+++ b/drivers/include/net/netdev.h
@@ -195,6 +195,7 @@ extern "C" {
 #endif
 
 #include <stdint.h>
+#include <errno.h>
 
 #include "iolist.h"
 #include "net/netopt.h"
@@ -413,6 +414,47 @@ typedef struct netdev_driver {
                const void *value, size_t value_len);
 } netdev_driver_t;
 
+/**
+ * @brief   Convenience function for declaring get() as not supported in general
+ *
+ * @param[in] dev           ignored
+ * @param[in] opt           ignored
+ * @param[in] value         ignored
+ * @param[in] max_len       ignored
+ *
+ * @return  always returns `-ENOTSUP`
+ */
+static inline int netdev_get_notsup(netdev_t *dev, netopt_t opt,
+                                    void *value, size_t max_len)
+{
+    (void)dev;
+    (void)opt;
+    (void)value;
+    (void)max_len;
+    return -ENOTSUP;
+}
+
+/**
+ * @brief   Convenience function for declaring set() as not supported in general
+ *
+ * @param[in] dev           ignored
+ * @param[in] opt           ignored
+ * @param[in] value         ignored
+ * @param[in] value_len     ignored
+ *
+ * @return  always returns `-ENOTSUP`
+ */
+static inline int netdev_set_notsup(netdev_t *dev, netopt_t opt,
+                                    const void *value, size_t value_len)
+{
+    (void)dev;
+    (void)opt;
+    (void)value;
+    (void)value_len;
+    return -ENOTSUP;
+}
+
+
 #ifdef __cplusplus
 }
 #endif

From a07e71418e775d553950af20f36651de4ac10bb2 Mon Sep 17 00:00:00 2001
From: Hauke Petersen <hauke.petersen@fu-berlin.de>
Date: Wed, 21 Nov 2018 14:24:12 +0100
Subject: [PATCH 2/3] drivers/slipdev: use netdev_set_notsup()

---
 drivers/slipdev/slipdev.c | 12 +-----------
 1 file changed, 1 insertion(+), 11 deletions(-)

diff --git a/drivers/slipdev/slipdev.c b/drivers/slipdev/slipdev.c
index 9d0a15ac3e..430c26b241 100644
--- a/drivers/slipdev/slipdev.c
+++ b/drivers/slipdev/slipdev.c
@@ -188,23 +188,13 @@ static int _get(netdev_t *netdev, netopt_t opt, void *value, size_t max_len)
     }
 }
 
-static int _set(netdev_t *netdev, netopt_t opt, const void *value,
-                size_t value_len)
-{
-    (void)netdev;
-    (void)opt;
-    (void)value;
-    (void)value_len;
-    return -ENOTSUP;
-}
-
 static const netdev_driver_t slip_driver = {
     .send = _send,
     .recv = _recv,
     .init = _init,
     .isr = _isr,
     .get = _get,
-    .set = _set,
+    .set = netdev_set_notsup,
 };
 
 void slipdev_setup(slipdev_t *dev, const slipdev_params_t *params)

From 755113d9212b150861bc76cddb8319381b810009 Mon Sep 17 00:00:00 2001
From: Hauke Petersen <hauke.petersen@fu-berlin.de>
Date: Wed, 21 Nov 2018 14:24:41 +0100
Subject: [PATCH 3/3] pkg/softdevice: use netdev_set_notsup()

---
 .../src/gnrc_nordic_ble_6lowpan.c                    | 12 +-----------
 1 file changed, 1 insertion(+), 11 deletions(-)

diff --git a/pkg/nordic_softdevice_ble/src/gnrc_nordic_ble_6lowpan.c b/pkg/nordic_softdevice_ble/src/gnrc_nordic_ble_6lowpan.c
index 312a6135b4..760bbdd343 100644
--- a/pkg/nordic_softdevice_ble/src/gnrc_nordic_ble_6lowpan.c
+++ b/pkg/nordic_softdevice_ble/src/gnrc_nordic_ble_6lowpan.c
@@ -230,16 +230,6 @@ static int _netdev_get(netdev_t *netdev, netopt_t opt,
     return res;
 }
 
-static int _netdev_set(netdev_t *netdev, netopt_t opt,
-                       const void *value, size_t value_len)
-{
-    (void)netdev;
-    (void)opt;
-    (void)value;
-    (void)value_len;
-    return -ENOTSUP;
-}
-
 static int _netif_send(gnrc_netif_t *netif, gnrc_pktsnip_t *pkt)
 {
     (void)netif;
@@ -282,7 +272,7 @@ static const netdev_driver_t _ble_netdev_driver = {
     .init = _netdev_init,
     .isr  =  NULL,
     .get  = _netdev_get,
-    .set  = _netdev_set,
+    .set  = netdev_set_notsup,
 };
 
 static netdev_t _ble_dummy_dev = {