Userled driver: Add option to check actual pin state with getall

include/nuttx/board.h

@@ -673,6 +673,28 @@ void board_userled(int led, bool ledon);
 void board_userled_all(uint32_t ledset);
 #endif
 
+/****************************************************************************
+ * Name:  board_userled_getall
+ *
+ * Description:
+ *   This interface may be used by application specific logic to read the
+ *   state of all board LEDs.  Definitions for the led set member
+ *   identification is provided in the board-specific board.h header file
+ *   that may be included like:
+ *
+ *     #included <arch/board/board.h>
+ *
+ *   If CONFIG_ARCH_LEDS is defined, then NuttX will control the on-board
+ *   LEDs.  If CONFIG_ARCH_LEDS is not defined, then this interfaces may be
+ *   available to check the LEDs directly from user board logic or indirectly
+ *   user applications (via the common LED character driver).
+ *
+ ****************************************************************************/
+
+#if defined(CONFIG_ARCH_HAVE_LEDS) && defined(CONFIG_USERLED_LOWER_READSTATE)
+void board_userled_getall(uint32_t *ledset);
+#endif
+
 /****************************************************************************
  * Name: board_button_initialize
  *

include/nuttx/leds/userled.h

@@ -126,6 +126,13 @@ struct userled_lowerhalf_s
 
   CODE void (*ll_setall)(FAR const struct userled_lowerhalf_s *lower,
                          userled_set_t ledset);
+
+#ifdef CONFIG_USERLED_LOWER_READSTATE
+  /* Get the state of all LEDs */
+
+  CODE void (*ll_getall)(FAR const struct userled_lowerhalf_s *lower,
+                         userled_set_t *ledset);
+#endif
 };
 
 /****************************************************************************