[Keyboard] Add Lain keyboard (#16345)

Co-authored-by: Joel Challis <git@zvecr.com>
Co-authored-by: Ryan <fauxpark@gmail.com>

keyboards/dm9records/lain/config.h

@@ -0,0 +1,47 @@
+// Copyright 2022 Takuya Urakawa @hsgw (dm9records.com, 5z6p.com)
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "config_common.h"
+
+/* USB Device descriptor parameter */
+#define VENDOR_ID 0x04D8
+#define PRODUCT_ID 0xE8F4
+#define DEVICE_VER 0x0001
+#define MANUFACTURER Dm9Records
+#define PRODUCT lain
+
+/* key matrix size */
+#define MATRIX_ROWS 4
+#define MATRIX_COLS 13
+
+/*
+ * Keyboard Matrix Assignments
+ */
+#define MATRIX_ROW_PINS \
+    { C6, D7, D6, D4 }
+#define MATRIX_COL_PINS \
+    { C7, F7, F6, F5, F4, F1, F0, B3, B2, B1, D2, D3, D5 }
+
+/* COL2ROW, ROW2COL */
+#define DIODE_DIRECTION COL2ROW
+
+/* LED Settings */
+#define LED_NUM 3
+#define LED_PINS \
+    { B6, B5, B4 }
+
+/* Debounce reduces chatter (unintended double-presses) - set 0 if debouncing is not needed */
+#define DEBOUNCE 5
+
+/* Mechanical locking support. Use KC_LCAP, KC_LNUM or KC_LSCR instead in keymap */
+#define LOCKING_SUPPORT_ENABLE
+/* Locking resynchronize hack */
+#define LOCKING_RESYNC_ENABLE
+
+/* disable these deprecated features by default */
+#define NO_ACTION_MACRO
+#define NO_ACTION_FUNCTION
+
+#define DYNAMIC_KEYMAP_LAYER_COUNT 6