1 files changed, 91 insertions, 0 deletions
diff --git a/quantum/process_keycode/process_underglow.c b/quantum/process_keycode/process_underglow.c
new file mode 100644
index 0000000000..779672ac07
--- /dev/null
+++ b/quantum/process_keycode/process_underglow.c
@@ -0,0 +1,91 @@
+// Copyright 2024 QMK
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "process_underglow.h"
+#include "rgblight.h"
+#include "action_util.h"
+#include "keycodes.h"
+#include "modifiers.h"
+
+bool process_underglow(uint16_t keycode, keyrecord_t *record) {
+    if (record->event.pressed) {
+        uint8_t shifted = get_mods() & MOD_MASK_SHIFT;
+        switch (keycode) {
+            case QK_UNDERGLOW_TOGGLE:
+                rgblight_toggle();
+                return false;
+            case QK_UNDERGLOW_MODE_NEXT:
+                if (shifted) {
+                    rgblight_step_reverse();
+                } else {
+                    rgblight_step();
+                }
+                return false;
+            case QK_UNDERGLOW_MODE_PREVIOUS:
+                if (shifted) {
+                    rgblight_step();
+                } else {
+                    rgblight_step_reverse();
+                }
+                return false;
+            case QK_UNDERGLOW_HUE_UP:
+                if (shifted) {
+                    rgblight_decrease_hue();
+                } else {
+                    rgblight_increase_hue();
+                }
+                return false;
+            case QK_UNDERGLOW_HUE_DOWN:
+                if (shifted) {
+                    rgblight_increase_hue();
+                } else {
+                    rgblight_decrease_hue();
+                }
+                return false;
+            case QK_UNDERGLOW_SATURATION_UP:
+                if (shifted) {
+                    rgblight_decrease_sat();
+                } else {
+                    rgblight_increase_sat();
+                }
+                return false;
+            case QK_UNDERGLOW_SATURATION_DOWN:
+                if (shifted) {
+                    rgblight_increase_sat();
+                } else {
+                    rgblight_decrease_sat();
+                }
+                return false;
+            case QK_UNDERGLOW_VALUE_UP:
+                if (shifted) {
+                    rgblight_decrease_val();
+                } else {
+                    rgblight_increase_val();
+                }
+                return false;
+            case QK_UNDERGLOW_VALUE_DOWN:
+                if (shifted) {
+                    rgblight_increase_hue();
+                } else {
+                    rgblight_decrease_hue();
+                }
+                return false;
+            case QK_UNDERGLOW_SPEED_UP:
+                if (shifted) {
+                    rgblight_decrease_speed();
+                } else {
+                    rgblight_increase_speed();
+                }
+                return false;
+            case QK_UNDERGLOW_SPEED_DOWN:
+                if (shifted) {
+                    rgblight_increase_speed();
+                } else {
+                    rgblight_decrease_speed();
+                }
+                return false;
+        }
+    }
+
+    return true;
+}