Case light brightness cleanup (#19856)

Co-authored-by: Chris <chris@chrisnovoa.com>

Marlin/src/feature/caselight.cpp

 
 CaseLight caselight;
 
-uint8_t CaseLight::brightness = CASE_LIGHT_DEFAULT_BRIGHTNESS;
+#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)
 #endif
 
 void CaseLight::update(const bool sflag) {
-  /**
-   * 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
-
-  #if ENABLED(CASE_LIGHT_USE_NEOPIXEL) || DISABLED(CASE_LIGHT_NO_BRIGHTNESS)
+  #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
 
 
   #else // !CASE_LIGHT_USE_NEOPIXEL
 
-    #if DISABLED(CASE_LIGHT_NO_BRIGHTNESS)
+    #if CASELIGHT_USES_BRIGHTNESS
       if (PWM_PIN(CASE_LIGHT_PIN))
         analogWrite(pin_t(CASE_LIGHT_PIN), (
           #if CASE_LIGHT_MAX_PWM == 255

Marlin/src/feature/caselight.h

   #include "leds/leds.h"
 #endif
 
+#if DISABLED(CASE_LIGHT_NO_BRIGHTNESS) || ENABLED(CASE_LIGHT_USE_NEOPIXEL)
+  #define CASELIGHT_USES_BRIGHTNESS 1
+#endif
+
 class CaseLight {
 public:
-  static uint8_t brightness;
+  #if CASELIGHT_USES_BRIGHTNESS
+    static uint8_t brightness;
+  #endif
   static bool on;
 
   static void update(const bool sflag);

Marlin/src/gcode/feature/caselight/M355.cpp

  */
 void GcodeSuite::M355() {
   bool didset = false;
-  if (parser.seenval('P')) {
-    didset = true;
-    caselight.brightness = parser.value_byte();
-  }
+  #if CASELIGHT_USES_BRIGHTNESS
+    if (parser.seenval('P')) {
+      didset = true;
+      caselight.brightness = parser.value_byte();
+    }
+  #endif
   const bool sflag = parser.seenval('S');
   if (sflag) {
     didset = true;
   if (!caselight.on)
     SERIAL_ECHOLNPGM(STR_OFF);
   else {
-    if (!PWM_PIN(CASE_LIGHT_PIN)) SERIAL_ECHOLNPGM(STR_ON);
-    else SERIAL_ECHOLN(int(caselight.brightness));
+    #if CASELIGHT_USES_BRIGHTNESS
+      if (PWM_PIN(CASE_LIGHT_PIN)) {
+        SERIAL_ECHOLN(int(caselight.brightness));
+        return;
+      }
+    #endif
+    SERIAL_ECHOLNPGM(STR_ON);
   }
 }
 

Marlin/src/gcode/host/M115.cpp

   #include "../../module/motion.h"
 #endif
 
+#if ENABLED(CASE_LIGHT_ENABLE)
+  #include "../../feature/caselight.h"
+#endif
+
 #if ENABLED(EXTENDED_CAPABILITIES_REPORT)
   static void cap_line(PGM_P const name, bool ena=false) {
     SERIAL_ECHOPGM("Cap:");
 
     // TOGGLE_LIGHTS (M355)
     cap_line(PSTR("TOGGLE_LIGHTS"), ENABLED(CASE_LIGHT_ENABLE));
-    cap_line(PSTR("CASE_LIGHT_BRIGHTNESS"), TERN0(CASE_LIGHT_ENABLE, PWM_PIN(CASE_LIGHT_PIN)));
+    cap_line(PSTR("CASE_LIGHT_BRIGHTNESS"), TERN0(CASE_LIGHT_ENABLE, TERN0(CASELIGHT_USES_BRIGHTNESS, TERN(CASE_LIGHT_USE_NEOPIXEL, true, PWM_PIN(CASE_LIGHT_PIN)))));
 
     // EMERGENCY_PARSER (M108, M112, M410, M876)
     cap_line(PSTR("EMERGENCY_PARSER"), ENABLED(EMERGENCY_PARSER));

Marlin/src/lcd/extui/ui_api.cpp

       caselight.update_enabled();
     }
 
-    #if DISABLED(CASE_LIGHT_NO_BRIGHTNESS)
+    #if CASELIGHT_USES_BRIGHTNESS
       float getCaseLightBrightness_percent()                 { return ui8_to_percent(caselight.brightness); }
       void setCaseLightBrightness_percent(const float value) {
          caselight.brightness = map(constrain(value, 0, 100), 0, 100, 0, 255);

Marlin/src/lcd/menu/menu_led.cpp

 #if ENABLED(CASE_LIGHT_MENU)
   #include "../../feature/caselight.h"
 
-  #if DISABLED(CASE_LIGHT_NO_BRIGHTNESS)
+  #if CASELIGHT_USES_BRIGHTNESS
     void menu_case_light() {
       START_MENU();
       BACK_ITEM(MSG_CONFIGURATION);

Marlin/src/module/settings.cpp

   void M710_report(const bool forReplay);
 #endif
 
-#if ENABLED(CASE_LIGHT_ENABLE) && DISABLED(CASE_LIGHT_NO_BRIGHTNESS)
+#if ENABLED(CASE_LIGHT_ENABLE)
   #include "../feature/caselight.h"
-  #define HAS_CASE_LIGHT_BRIGHTNESS 1
 #endif
 
 #if ENABLED(PASSWORD_FEATURE)
   #endif
 
   //
-  // HAS_CASE_LIGHT_BRIGHTNESS
+  // CASELIGHT_USES_BRIGHTNESS
   //
-  #if HAS_CASE_LIGHT_BRIGHTNESS
+  #if CASELIGHT_USES_BRIGHTNESS
     uint8_t caselight_brightness;                        // M355 P
   #endif
 
 
   TERN_(HAS_LINEAR_E_JERK, planner.recalculate_max_e_jerk());
 
-  TERN_(HAS_CASE_LIGHT_BRIGHTNESS, caselight.update_brightness());
+  TERN_(CASELIGHT_USES_BRIGHTNESS, caselight.update_brightness());
 
   // Refresh steps_to_mm with the reciprocal of axis_steps_per_mm
   // and init stepper.count[], planner.position[] with current_position
     //
     // Case Light Brightness
     //
-    #if HAS_CASE_LIGHT_BRIGHTNESS
+    #if CASELIGHT_USES_BRIGHTNESS
       EEPROM_WRITE(caselight.brightness);
     #endif
 
       //
       // Case Light Brightness
       //
-      #if HAS_CASE_LIGHT_BRIGHTNESS
+      #if CASELIGHT_USES_BRIGHTNESS
         _FIELD_TEST(caselight_brightness);
         EEPROM_READ(caselight.brightness);
       #endif
   //
   // Case Light Brightness
   //
-  TERN_(HAS_CASE_LIGHT_BRIGHTNESS, caselight.brightness = CASE_LIGHT_DEFAULT_BRIGHTNESS);
+  TERN_(CASELIGHT_USES_BRIGHTNESS, caselight.brightness = CASE_LIGHT_DEFAULT_BRIGHTNESS);
 
   //
   // TOUCH_SCREEN_CALIBRATION