Clarify solenoid active / magnet-on state

Marlin/src/module/tool_change.cpp

 #elif ENABLED(PARKING_EXTRUDER)
 
   void pe_solenoid_init() {
-    LOOP_LE_N(n, 1)
-      TERN(PARKING_EXTRUDER_SOLENOIDS_INVERT, pe_activate_solenoid, pe_deactivate_solenoid)(n);
+    LOOP_LE_N(n, 1) pe_solenoid_set_pin_state(n, !PARKING_EXTRUDER_SOLENOIDS_PINS_ACTIVE);
   }
 
-  void pe_set_solenoid(const uint8_t extruder_num, const uint8_t state) {
+  void pe_solenoid_set_pin_state(const uint8_t extruder_num, const uint8_t state) {
     switch (extruder_num) {
       case 1: OUT_WRITE(SOL1_PIN, state); break;
       default: OUT_WRITE(SOL0_PIN, state); break;
     if (!extruder_parked) return false; // nothing to do
 
     if (homed_towards_final_tool) {
-      pe_deactivate_solenoid(1 - final_tool);
+      pe_solenoid_magnet_off(1 - final_tool);
       DEBUG_ECHOLNPAIR("Disengage magnet", (int)(1 - final_tool));
-      pe_activate_solenoid(final_tool);
+      pe_solenoid_magnet_on(final_tool);
       DEBUG_ECHOLNPAIR("Engage magnet", (int)final_tool);
-      extruder_parked = false;
+      parking_extruder_set_parked(false);
       return false;
     }
 
 
         planner.synchronize();
         DEBUG_ECHOLNPGM("(2) Disengage magnet");
-        pe_deactivate_solenoid(active_extruder);
+        pe_solenoid_magnet_off(active_extruder);
 
         // STEP 3
 
       DEBUG_ECHOLNPGM("(4) Engage magnetic field");
 
       // Just save power for inverted magnets
-      TERN_(PARKING_EXTRUDER_SOLENOIDS_INVERT, pe_activate_solenoid(active_extruder));
-      pe_activate_solenoid(new_tool);
+      TERN_(PARKING_EXTRUDER_SOLENOIDS_INVERT, pe_solenoid_magnet_on(active_extruder));
+      pe_solenoid_magnet_on(new_tool);
 
       // STEP 5
 
       extruder_parked = false;
     }
     else if (do_solenoid_activation) { // && nomove == true
-      // Deactivate old extruder solenoid
-      TERN(PARKING_EXTRUDER_SOLENOIDS_INVERT, pe_activate_solenoid, pe_deactivate_solenoid)(active_extruder);
-      // Only engage magnetic field for new extruder
-      TERN(PARKING_EXTRUDER_SOLENOIDS_INVERT, pe_deactivate_solenoid, pe_activate_solenoid)(new_tool);
+      // Deactivate current extruder solenoid
+      pe_solenoid_set_pin_state(active_extruder, !PARKING_EXTRUDER_SOLENOIDS_PINS_ACTIVE);
+      // Engage new extruder magnetic field
+      pe_solenoid_set_pin_state(new_tool, PARKING_EXTRUDER_SOLENOIDS_PINS_ACTIVE);
     }
 
     do_solenoid_activation = true; // Activate solenoid for subsequent tool_change()
             // Just move back down
             DEBUG_ECHOLNPGM("Move back Z only");
 
-            #if ENABLED(TOOLCHANGE_PARK)
-              if (toolchange_settings.enable_park)
-            #endif
-            do_blocking_move_to_z(destination.z, planner.settings.max_feedrate_mm_s[Z_AXIS]);
+            if (TERN1(TOOLCHANGE_PARK, toolchange_settings.enable_park))
+              do_blocking_move_to_z(destination.z, planner.settings.max_feedrate_mm_s[Z_AXIS]);
 
           #else
             // Move back to the original (or adjusted) position

Marlin/src/module/tool_change.h

     #define PE_MAGNET_ON_STATE PARKING_EXTRUDER_SOLENOIDS_PINS_ACTIVE
   #endif
 
-  void pe_set_solenoid(const uint8_t extruder_num, const uint8_t state);
+  void pe_solenoid_set_pin_state(const uint8_t extruder_num, const uint8_t state);
 
-  inline void pe_activate_solenoid(const uint8_t extruder_num) { pe_set_solenoid(extruder_num, PE_MAGNET_ON_STATE); }
-  inline void pe_deactivate_solenoid(const uint8_t extruder_num) { pe_set_solenoid(extruder_num, !PE_MAGNET_ON_STATE); }
+  inline void pe_solenoid_magnet_on(const uint8_t extruder_num)  { pe_solenoid_set_pin_state(extruder_num,  PE_MAGNET_ON_STATE); }
+  inline void pe_solenoid_magnet_off(const uint8_t extruder_num) { pe_solenoid_set_pin_state(extruder_num, !PE_MAGNET_ON_STATE); }
 
   void pe_solenoid_init();