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diff --git a/Marlin/src/feature/caselight.cpp b/Marlin/src/feature/caselight.cpp
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+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "../inc/MarlinConfig.h"
+
+#if ENABLED(CASE_LIGHT_ENABLE)
+
+#include "caselight.h"
+
+CaseLight caselight;
+
+#if CASELIGHT_USES_BRIGHTNESS && !defined(CASE_LIGHT_DEFAULT_BRIGHTNESS)
+  #define CASE_LIGHT_DEFAULT_BRIGHTNESS 0 // For use on PWM pin as non-PWM just sets a default
+#endif
+
+#if CASELIGHT_USES_BRIGHTNESS
+  uint8_t CaseLight::brightness = CASE_LIGHT_DEFAULT_BRIGHTNESS;
+#endif
+
+bool CaseLight::on = CASE_LIGHT_DEFAULT_ON;
+
+#if ENABLED(CASE_LIGHT_USE_NEOPIXEL)
+  LEDColor CaseLight::color =
+    #ifdef CASE_LIGHT_NEOPIXEL_COLOR
+      CASE_LIGHT_NEOPIXEL_COLOR
+    #else
+      { 255, 255, 255, 255 }
+    #endif
+  ;
+#endif
+
+#ifndef INVERT_CASE_LIGHT
+  #define INVERT_CASE_LIGHT false
+#endif
+
+void CaseLight::update(const bool sflag) {
+  #if CASELIGHT_USES_BRIGHTNESS
+    /**
+     * The brightness_sav (and sflag) is needed because ARM chips ignore
+     * a "WRITE(CASE_LIGHT_PIN,x)" command to the pins that are directly
+     * controlled by the PWM module. In order to turn them off the brightness
+     * level needs to be set to OFF. Since we can't use the PWM register to
+     * save the last brightness level we need a variable to save it.
+     */
+    static uint8_t brightness_sav;  // Save brightness info for restore on "M355 S1"
+
+    if (on || !sflag)
+      brightness_sav = brightness;  // Save brightness except for M355 S0
+    if (sflag && on)
+      brightness = brightness_sav;  // Restore last brightness for M355 S1
+
+    const uint8_t i = on ? brightness : 0, n10ct = INVERT_CASE_LIGHT ? 255 - i : i;
+  #endif
+
+  #if ENABLED(CASE_LIGHT_USE_NEOPIXEL)
+
+    leds.set_color(
+      MakeLEDColor(color.r, color.g, color.b, color.w, n10ct),
+      false
+    );
+
+  #else // !CASE_LIGHT_USE_NEOPIXEL
+
+    #if CASELIGHT_USES_BRIGHTNESS
+      if (PWM_PIN(CASE_LIGHT_PIN))
+        analogWrite(pin_t(CASE_LIGHT_PIN), (
+          #if CASE_LIGHT_MAX_PWM == 255
+            n10ct
+          #else
+            map(n10ct, 0, 255, 0, CASE_LIGHT_MAX_PWM)
+          #endif
+        ));
+      else
+    #endif
+      {
+        const bool s = on ? !INVERT_CASE_LIGHT : INVERT_CASE_LIGHT;
+        WRITE(CASE_LIGHT_PIN, s ? HIGH : LOW);
+      }
+
+  #endif // !CASE_LIGHT_USE_NEOPIXEL
+}
+
+#endif // CASE_LIGHT_ENABLE