Refactor to using .keymap files

* Still just devicetree keymaps.
* Filename can now use `<board>.keymap` or
  `<shield>.keymap` convention, including
  overrides for revisions, etc.

app/CMakeLists.txt

@@ -18,10 +18,6 @@ include(cmake/zmk_config.cmake)
 find_package(Zephyr REQUIRED HINTS ../zephyr)
 project(zmk)
 
-if(EXISTS ${KEYMAP_DIR}/keymap.c)
-  target_sources(app PRIVATE ${KEYMAP_DIR}/keymap.c)
-endif()
-
 zephyr_linker_sources(RODATA include/linker/zmk-events.ld)
 
 # Add your source file to the "app" target. This must come after

app/boards/shields/petejohanson_handwire/Kconfig.defconfig

@@ -1,13 +0,0 @@
-
-if SHIELD_PETEJOHANSON_HANDWIRE
-
-config ZMK_KEYBOARD_NAME
-	default "Pete's Handwire Breadboard"
-
-config ZMK_BLE
-	default y
-
-config ZMK_ACTION_MOD_TAP
-	default y
-
-endif

app/boards/shields/petejohanson_handwire/Kconfig.shield

@@ -1,5 +0,0 @@
-# Copyright (c) 2019 Linaro Limited
-# SPDX-License-Identifier: MIT
-
-config SHIELD_PETEJOHANSON_HANDWIRE
-	def_bool $(shields_list_contains,petejohanson_handwire)

app/boards/shields/petejohanson_handwire/keymap/keymap.overlay

@@ -1,40 +0,0 @@
-#include <dt-bindings/zmk/keys.h>
-#include <behaviors.dtsi>
-
-/ {
-	chosen {
-		zmk,keymap = &keymap0;
-	};
-
-	keymap0: keymap {
-		compatible = "zmk,keymap";
-		label ="Default keymap";
-		layers = <&default &lower &raise>;
-	};
-
-	layers {
-		compatible = "zmk,layers";
-
-		default: layer_0 {
-			label = "DEFAULT";
-			bindings = <
-				&cp M_NEXT &mt MOD_LSFT B &trans &trans
-				&mo 1  &mo 2         &trans &trans>;
-		};
-
-		lower: layer_1 {
-			label = "LOWER";
-
-			bindings = <
-				&cp M_PLAY &cp M_NEXT &trans &trans
-				&trans  &trans &trans &trans>;
-		};
-
-		raise: layer_2 {
-			label = "RAISE";
-			bindings = <
-				&kp C &kp D &trans &trans
-				&trans  &kp E &trans &trans>;
-		};
-	};
-};

app/boards/shields/petejohanson_handwire/petejohanson_handwire.conf

@@ -1 +0,0 @@
-CONFIG_ZMK_KSCAN_COMPOSITE_DRIVER=y

app/boards/shields/petejohanson_handwire/petejohanson_handwire.overlay

@@ -1,44 +0,0 @@
-
-/ {
-	chosen {
-		zmk,kscan = &kscan0;
-	};
-
-	kscan0: kscan_0 {
-		compatible = "zmk,kscan-composite";
-		label = "KSCAN_COMP";
-		rows = <2>;
-		columns = <4>;
-
-		left {
-			kscan = <&left_hand>;
-		};
-
-		right {
-			kscan = <&right_hand>;
-			column-offset = <2>;
-		};
-	};
-
-	left_hand: kscan_1 {
-		compatible = "zmk,kscan-gpio-matrix";
-		label = "KSCAN_LEFT";
-
-		diode-direction = "row2col";
-		row-gpios = <&arduino_header 8 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>,
-		            <&arduino_header 9 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
-		col-gpios = <&arduino_header 10 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>,
-		            <&arduino_header 11 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
-	};
-
-	right_hand: kscan_2 {
-		compatible = "zmk,kscan-gpio-matrix";
-		label = "KSCAN_RIGHT";
-
-		diode-direction = "row2col";
-		row-gpios = <&arduino_header 12 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>,
-		            <&arduino_header 13 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
-		col-gpios = <&arduino_header 14 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>,
-		            <&arduino_header 15 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
-	};
-};

app/boards/shields/petejohanson_pro_micro_handwire/Kconfig.defconfig

@@ -1,13 +0,0 @@
-
-if SHIELD_PETEJOHANSON_PRO_MICRO_HANDWIRE
-
-config ZMK_KEYBOARD_NAME
-	default "Pete's ProMicro Compat Handwire"
-
-config ZMK_USB
-	default y
-
-config ZMK_ACTION_MOD_TAP
-	default y
-
-endif

app/boards/shields/petejohanson_pro_micro_handwire/Kconfig.shield

@@ -1,5 +0,0 @@
-# Copyright (c) 2020 Pete Johanson
-# SPDX-License-Identifier: MIT
-
-config SHIELD_PETEJOHANSON_PRO_MICRO_HANDWIRE
-	def_bool $(shields_list_contains,petejohanson_pro_micro_handwire)

app/boards/shields/petejohanson_pro_micro_handwire/keymap/keymap.overlay

@@ -1,41 +0,0 @@
-#include <behaviors.dtsi>
-#include <dt-bindings/zmk/keys.h>
-
-/ {
-	chosen {
-		zmk,keymap = &keymap0;
-	};
-	keymap0: keymap {
-		compatible = "zmk,keymap";
-		label ="Default keymap";
-		layers = <&default &lower &raise>;
-	};
-
-	layers {
-		compatible = "zmk,layers";
-
-		default: layer_0 {
-			label = "DEFAULT";
-
-			bindings = <
-				&mo 1 &kp A
-				&mo 2 &kp C>;
-		};
-
-		lower: layer_1 {
-			label = "LOWER";
-
-			bindings = <
-				&trans &kp D
-				&trans &kp E>;
-		};
-
-		raise: layer_2 {
-			label = "RAISE";
-
-			bindings = <
-				&trans &kp I
-				&trans &kp H>;
-		};
-	};
-};

app/boards/shields/petejohanson_pro_micro_handwire/petejohanson_pro_micro_handwire.overlay

@@ -1,17 +0,0 @@
-
-/ {
-	chosen {
-		zmk,kscan = &kscan0;
-	};
-
-	kscan0: kscan {
-		compatible = "zmk,kscan-gpio-matrix";
-		label = "KSCAN";
-
-		diode-direction = "row2col";
-		row-gpios = <&pro_micro_d 6 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>,
-		            <&pro_micro_d 7 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
-		col-gpios = <&pro_micro_d 8 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>,
-		            <&pro_micro_d 9 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
-	};
-};

app/cmake/zmk_config.cmake

@@ -62,11 +62,9 @@ foreach(root ${BOARD_ROOT})
 	    NAMES ${BOARD}_defconfig
 	    PATHS ${root}/boards/*/*
 	    NO_DEFAULT_PATH
-	    )
-    	if(BOARD_DIR)
-		if (EXISTS "${BOARD_DIR}/keymap")
-			list(APPEND KEYMAP_DIRS ${BOARD_DIR}/keymap)
-		endif()
+		)
+	if(BOARD_DIR)
+		list(APPEND KEYMAP_DIRS ${BOARD_DIR})
 	endif()
 
 	if(DEFINED SHIELD)
@@ -77,37 +75,16 @@ foreach(root ${BOARD_ROOT})
 		    )
 		foreach(shield_path ${shields_refs_list})
 			get_filename_component(SHIELD_DIR ${shield_path} NAME)
-			if (EXISTS "${shield_path}/keymap")
-				list(APPEND KEYMAP_DIRS ${shield_path}/keymap)
-			endif()
+			list(APPEND KEYMAP_DIRS ${shield_path})
 		endforeach()
 	endif()
 endforeach()
 
-find_path(BASE_KEYMAPS_DIR
-	NAMES ${KEYMAP}/keymap.overlay
-	PATHS ${KEYMAP_DIRS}
-	NO_DEFAULT_PATH
-)
-
-if (BASE_KEYMAPS_DIR)
-	set(KEYMAP_DIR "${BASE_KEYMAPS_DIR}/${KEYMAP}" CACHE STRING "Selected keymap directory")
-	message(STATUS "Keyboard Base Keymap: ${KEYMAP_DIR}/")
-	# Used to let local imports of custom keycodes work as expected
-	list(APPEND DTS_ROOT ${KEYMAP_DIR})
-	if (EXISTS "${KEYMAP_DIR}/include")
-		include_directories("${KEYMAP_DIR}/include")
-	endif()
-	list(APPEND ZMK_DTC_FILES "${KEYMAP_DIR}keymap.overlay")
-endif()
-
 if (ZMK_CONFIG)
 	if (EXISTS ${ZMK_CONFIG})
 		message(STATUS "ZMK Config directory: ${ZMK_CONFIG}")
 		list(APPEND DTS_ROOT ${ZMK_CONFIG})
-		if (EXISTS "${ZMK_CONFIG}/include")
-			include_directories("${ZMK_CONFIG}/include")
-		endif()
+		list(PREPEND KEYMAP_DIRS "${ZMK_CONFIG}")
 
 		if (SHIELD)
 			message(STATUS "Board: ${BOARD}, ${BOARD_DIR}, ${SHIELD}, ${SHIELD_DIR}")
@@ -137,7 +114,7 @@ if (ZMK_CONFIG)
 
 		foreach(conf ${config_candidates})
 			if (EXISTS "${conf}")
-				message(STATUS "ZMK Config Kconfig: ${overlay}")
+				message(STATUS "ZMK Config Kconfig: ${conf}")
 				set(CONF_FILE "${conf}")
 				break()
 			endif()
@@ -147,6 +124,25 @@ if (ZMK_CONFIG)
 	endif()
 endif()
 
+
+if(NOT KEYMAP_FILE)
+	foreach(keymap_dir ${KEYMAP_DIRS})
+		foreach(keymap_prefix ${SHIELD} ${SHIELD_DIR} ${BOARD} ${BOARD_DIR})
+			if (EXISTS ${keymap_dir}/${keymap_prefix}.keymap)
+				set(KEYMAP_FILE "${keymap_dir}/${keymap_prefix}.keymap" CACHE STRING "Selected keymap file")
+				message(STATUS "Using keymap file: ${KEYMAP_FILE}")
+				break()
+			endif()
+		endforeach()
+	endforeach()
+endif()
+
+if (NOT KEYMAP_FILE)
+	message(FATAL_ERROR "Failed to locate keymap file!")
+endif()
+
+list(APPEND ZMK_DTC_FILES ${KEYMAP_FILE})
+
 if (ZMK_DTC_FILES)
 	string(REPLACE ";" " " DTC_OVERLAY_FILE "${ZMK_DTC_FILES}")
 endif()