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diff --git a/quantum/process_keycode/process_layer_lock.c b/quantum/process_keycode/process_layer_lock.c
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+// Copyright 2022-2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @file layer_lock.c
+ * @brief Layer Lock implementation
+ *
+ * For full documentation, see
+ * <https://getreuer.info/posts/keyboards/layer-lock>
+ */
+
+#include "layer_lock.h"
+#include "process_layer_lock.h"
+#include "quantum_keycodes.h"
+#include "action_util.h"
+
+// The current lock state. The kth bit is on if layer k is locked.
+extern layer_state_t locked_layers;
+#if defined(LAYER_LOCK_IDLE_TIMEOUT) && LAYER_LOCK_IDLE_TIMEOUT > 0
+extern uint32_t layer_lock_timer;
+#endif
+
+// Handles an event on an `MO` or `TT` layer switch key.
+static bool handle_mo_or_tt(uint8_t layer, keyrecord_t* record) {
+ if (is_layer_locked(layer)) {
+ if (record->event.pressed) { // On press, unlock the layer.
+ layer_lock_invert(layer);
+ }
+ return false; // Skip default handling.
+ }
+ return true;
+}
+
+bool process_layer_lock(uint16_t keycode, keyrecord_t* record) {
+#ifndef NO_ACTION_LAYER
+# if defined(LAYER_LOCK_IDLE_TIMEOUT) && LAYER_LOCK_IDLE_TIMEOUT > 0
+ layer_lock_timer = timer_read32();
+# endif // LAYER_LOCK_IDLE_TIMEOUT > 0
+
+ // The intention is that locked layers remain on. If something outside of
+ // this feature turned any locked layers off, unlock them.
+ if ((locked_layers & ~layer_state) != 0) {
+ layer_lock_set_kb(locked_layers &= layer_state);
+ }
+
+ if (keycode == QK_LAYER_LOCK) {
+ if (record->event.pressed) { // The layer lock key was pressed.
+ layer_lock_invert(get_highest_layer(layer_state));
+ }
+ return false;
+ }
+
+ switch (keycode) {
+ case QK_MOMENTARY ... QK_MOMENTARY_MAX: // `MO(layer)` keys.
+ return handle_mo_or_tt(QK_MOMENTARY_GET_LAYER(keycode), record);
+
+ case QK_LAYER_TAP_TOGGLE ... QK_LAYER_TAP_TOGGLE_MAX: // `TT(layer)`.
+ return handle_mo_or_tt(QK_LAYER_TAP_TOGGLE_GET_LAYER(keycode), record);
+
+ case QK_LAYER_MOD ... QK_LAYER_MOD_MAX: { // `LM(layer, mod)`.
+ uint8_t layer = QK_LAYER_MOD_GET_LAYER(keycode);
+ if (is_layer_locked(layer)) {
+ if (record->event.pressed) { // On press, unlock the layer.
+ layer_lock_invert(layer);
+ } else { // On release, clear the mods.
+ clear_mods();
+ send_keyboard_report();
+ }
+ return false; // Skip default handling.
+ }
+ } break;
+
+# ifndef NO_ACTION_TAPPING
+ case QK_LAYER_TAP ... QK_LAYER_TAP_MAX: // `LT(layer, key)` keys.
+ if (record->tap.count == 0 && !record->event.pressed && is_layer_locked(QK_LAYER_TAP_GET_LAYER(keycode))) {
+ // Release event on a held layer-tap key where the layer is locked.
+ return false; // Skip default handling so that layer stays on.
+ }
+ break;
+# endif // NO_ACTION_TAPPING
+ }
+#endif // NO_ACTION_LAYER
+ return true;
+}