Clicker2-STM32: Add some mostly bogus MAC initializatinon logic.

wireless/ieee802154/mac802154.c

@@ -524,6 +524,19 @@ static int mac802154_rsporphan(FAR struct ieee802154_mac_s *mac,
  *
  * Description:
  *   Create a 802.15.4 MAC device from a 802.15.4 compatible radio device.
+ *   To create a 802.15.4 MAC, you need to pass:
+ *
+ *     - an instance of a radio driver in radiodev
+ *     - a pointer to a structure that contains MAC callback routines to
+ *       handle confirmations and indications. NULL entries indicate no
+ *       callback.
+ *
+ *   In return you get a mac structure that has pointers to MAC operations
+ *   and responses.
+ *
+ *   This API does not create any device accessible to userspace. If you
+ *   want to call these APIs from userspace, you have to wrap your mac in a
+ *   character device via mac802154_device.c.
  *
  ****************************************************************************/
 
@@ -537,7 +550,8 @@ FAR struct ieee802154_mac_s *
 
   mac = (FAR struct ieee802154_privmac_s *)
     kmm_zalloc(sizeof(struct ieee802154_privmac_s));
-  if(!mac)
+
+  if (mac == NULL)
     {
       return NULL;
     }
@@ -546,7 +560,9 @@ FAR struct ieee802154_mac_s *
 
   mac->pubmac.radio = radiodev;
   mac->pubmac.ops   = mac802154ops;
+
   mac802154_defaultmib(mac);
   mac802154_applymib(mac);
+
   return &mac->pubmac;
 }

wireless/ieee802154/radio802154_device.c

@@ -487,7 +487,8 @@ static int radio802154dev_ioctl(FAR struct file *filep, int cmd,
  *
  ****************************************************************************/
 
-int radio802154dev_register(FAR struct ieee802154_radio_s *radio, FAR char *devname)
+int radio802154dev_register(FAR struct ieee802154_radio_s *radio,
+                            FAR char *devname)
 {
   FAR struct radio802154_devwrapper_s *dev;