Move Zephyr app into subdirectory.

app/include/zmk/keymap.h

@@ -0,0 +1,28 @@
+#pragma once
+
+#include <devicetree.h>
+#include <usb/usb_device.h>
+#include <usb/class/usb_hid.h>
+#include <dt-bindings/zmk/keys.h>
+
+#include <zmk/matrix.h>
+#include <zmk/keys.h>
+
+#define ZMK_KEYMAP_NODE DT_CHOSEN(zmk_keymap)
+#define ZMK_KEYMAP_LAYERS_LEN DT_PROP_LEN(ZMK_KEYMAP_NODE, layers)
+
+/* TODO: Need to actually be able to get a NODELABEL from a node id
+#define _ZMK_KEYMAP_GENERATE_LAYER_CONST(node_id) \
+    DT_NODELABEL_FOR_NODE(node_id)_layer,
+
+enum zmk_keymap_layer
+{
+    DT_FOREACH_CHILD(DT_INST(0, zmk_layers), _ZMK_KEYMAP_GENERATE_LAYER_CONST)
+};
+*/
+
+bool zmk_keymap_layer_activate(u8_t layer);
+bool zmk_keymap_layer_deactivate(u8_t layer);
+
+zmk_key
+zmk_keymap_keycode_from_position(u32_t row, u32_t column);