Implement momentary layer + transparent behaviors

* Implement "momentary layer" behavior with `&mo`
  reference.
* Implement basic "transparent" behavior with `&trans`
  reference.

app/CMakeLists.txt

@@ -37,6 +37,8 @@ target_sources(app PRIVATE src/behaviors/behavior_hid.c)
 target_sources(app PRIVATE src/behaviors/behavior_key_press.c)
 target_sources(app PRIVATE src/behaviors/behavior_reset.c)
 target_sources(app PRIVATE src/behaviors/behavior_mod_tap.c)
+target_sources(app PRIVATE src/behaviors/behavior_momentary_layer.c)
+target_sources(app PRIVATE src/behaviors/behavior_transparent.c)
 target_sources_ifdef(CONFIG_ZMK_BLE app PRIVATE src/ble.c)
 target_sources_ifdef(CONFIG_ZMK_KSCAN_MOCK_DRIVER app PRIVATE src/kscan_mock.c)
 target_sources_ifdef(CONFIG_ZMK_KSCAN_COMPOSITE_DRIVER app PRIVATE src/kscan_composite.c)

app/boards/native_posix.overlay

@@ -1,6 +1,8 @@
 #include <dt-bindings/zmk/keys.h>
 #include <behaviors/key_press.dtsi>
+#include <behaviors/transparent.dtsi>
 #include <behaviors/mod_tap.dtsi>
+#include <behaviors/momentary_layer.dtsi>
 #include <behaviors/reset.dtsi>
 #include <behaviors/keymap.dtsi>
 #include <behaviors/hid.dtsi>
@@ -65,7 +67,7 @@
 			>;
 
 			bindings = <
-				&kp 5 &mt MOD_LSFT KC_B &kp 10 &kp 11
+				&kp 5 &mo 1 &kp 10 &kp 11
 				&kp 1  &kp 2 &kp 4 &kp 89>;
 		};
 
@@ -77,8 +79,8 @@
 			>;
 
 			bindings = <
-				&kp 5 &kp 0 &kp 10 &kp 11
+				&kp 20 &trans &kp 18 &kp 19
-				&kp 1  &kp 2 &kp 4 &kp 89>;
+				&kp 21  &kp 22 &kp 24 &kp 49>;
 		};
 
 		raise: layer_2 {

app/dts/behaviors/momentary_layer.dtsi

@@ -0,0 +1,9 @@
+/ {
+	behaviors {
+		mo: behavior_momentary_layer {
+			compatible = "zmk,behavior-momentary-layer";
+			label = "MO";
+			#binding-cells = <1>;
+		};
+	};
+};

app/dts/behaviors/transparent.dtsi

@@ -0,0 +1,9 @@
+/ {
+	behaviors {
+		trans: behavior_transparent {
+			compatible = "zmk,behavior-transparent";
+			label = "TRANS";
+			#binding-cells = <0>;
+		};
+	};
+};

app/dts/bindings/behaviors/zmk,behavior-momentary-layer.yaml

@@ -0,0 +1,8 @@
+# Copyright (c) 2020, Pete Johanson
+# SPDX-License-Identifier: MIT
+
+description: Momentary layer on press/release behavior
+
+compatible: "zmk,behavior-momentary-layer"
+
+include: one_param.yaml

app/dts/bindings/behaviors/zmk,behavior-transparent.yaml

@@ -0,0 +1,8 @@
+# Copyright (c) 2020, Pete Johanson
+# SPDX-License-Identifier: MIT
+
+description: Transparent Binding Behavior
+
+compatible: "zmk,behavior-transparent"
+
+include: zero_param.yaml

app/src/behaviors/behavior_momentary_layer.c

@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2020 Peter Johanson <peter@peterjohanson.com>
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#define DT_DRV_COMPAT zmk_behavior_momentary_layer
+
+#include <device.h>
+#include <drivers/behavior.h>
+#include <logging/log.h>
+
+#include <zmk/events.h>
+#include <zmk/keymap.h>
+
+LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
+
+struct behavior_mo_config { };
+struct behavior_mo_data { };
+
+static int behavior_mo_init(struct device *dev)
+{
+	return 0;
+};
+
+
+static int on_keymap_binding_pressed(struct device *dev, u32_t position, u32_t layer, u32_t _)
+{
+  LOG_DBG("position %d layer %d", position, layer);
+
+  return zmk_keymap_layer_activate(layer);
+}
+
+static int on_keymap_binding_released(struct device *dev, u32_t position, u32_t layer, u32_t _)
+{
+  LOG_DBG("position %d layer %d", position, layer);
+
+  return zmk_keymap_layer_deactivate(layer);
+}
+
+static const struct behavior_driver_api behavior_mo_driver_api = {
+  .binding_pressed = on_keymap_binding_pressed,
+  .binding_released = on_keymap_binding_released
+};
+
+
+static const struct behavior_mo_config behavior_mo_config = {};
+
+static struct behavior_mo_data behavior_mo_data;
+
+DEVICE_AND_API_INIT(behavior_mo, DT_INST_LABEL(0), behavior_mo_init,
+                    &behavior_mo_data,
+                    &behavior_mo_config,
+                    APPLICATION, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT,
+                    &behavior_mo_driver_api);

app/src/behaviors/behavior_transparent.c

@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2020 Peter Johanson <peter@peterjohanson.com>
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#define DT_DRV_COMPAT zmk_behavior_transparent
+
+#include <device.h>
+#include <power/reboot.h>
+#include <drivers/behavior.h>
+#include <logging/log.h>
+
+LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
+
+struct behavior_transparent_config { };
+struct behavior_transparent_data { };
+
+static int behavior_transparent_init(struct device *dev)
+{
+	return 0;
+};
+
+static int on_keymap_binding_pressed(struct device *dev, u32_t position, u32_t _param1, u32_t _param2)
+{
+  return 1;
+}
+
+static int on_keymap_binding_released(struct device *dev, u32_t position, u32_t _param1, u32_t _param2)
+{
+  return 1;
+}
+
+static const struct behavior_driver_api behavior_transparent_driver_api = {
+  .binding_pressed = on_keymap_binding_pressed,
+  .binding_released = on_keymap_binding_released,
+};
+
+
+static const struct behavior_transparent_config behavior_transparent_config = {};
+
+static struct behavior_transparent_data behavior_transparent_data;
+
+DEVICE_AND_API_INIT(behavior_transparent, DT_INST_LABEL(0), behavior_transparent_init,
+                    &behavior_transparent_data,
+                    &behavior_transparent_config,
+                    APPLICATION, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT,
+                    &behavior_transparent_driver_api);