Added toggle and removed a param

app/include/dt-bindings/zmk/ext_power.h

@@ -6,11 +6,8 @@
 
 #define EXT_POWER_OFF_CMD 0
 #define EXT_POWER_ON_CMD 1
+#define EXT_POWER_TOGGLE_CMD 2
 
-/*
- * Note: Some future commands might include additional parameters, so we
- * defines these aliases up front.
- */
-
-#define EP_ON EXT_POWER_ON_CMD 0
-#define EP_OFF EXT_POWER_OFF_CMD 0
+#define EP_ON EXT_POWER_ON_CMD
+#define EP_OFF EXT_POWER_OFF_CMD
+#define EP_TOG EXT_POWER_TOGGLE_CMD

app/src/behaviors/behavior_ext_power.c

@@ -30,6 +30,11 @@ static int on_keymap_binding_pressed(struct device *dev, u32_t position, u32_t c
         return ext_power_api->disable(ext_power);
     case EXT_POWER_ON_CMD:
         return ext_power_api->enable(ext_power);
+    case EXT_POWER_TOGGLE_CMD:
+        if(ext_power_api->get(ext_power) > 0)
+            return ext_power_api->disable(ext_power);
+        else
+            return ext_power_api->enable(ext_power);
     default:
         LOG_ERR("Unknown ext_power command: %d", command);
     }