Add Suspend functions (#3112)

* Add suspend functions

* Disable RGB code if it's disabled

* Add suspend code to ChibiOS for future compatibility

* Add keyboard_init functions

* Change where references so it will compile

* Wrong command chained in wake up kb function

* Fix non-feature file changes

* Add documentation

* Re-add matrix init docs

* add rgblight code to example

* Remove keyboard init stuff for separate PR

tmk_core/common/avr/suspend.c

@@ -72,6 +72,21 @@ void suspend_idle(uint8_t time)
  */
 static uint8_t wdt_timeout = 0;
 
+/** \brief Run keyboard level Power down
+ *
+ * FIXME: needs doc
+ */
+__attribute__ ((weak))
+void suspend_power_down_user (void) { }
+/** \brief Run keyboard level Power down
+ *
+ * FIXME: needs doc
+ */
+__attribute__ ((weak))
+void suspend_power_down_kb(void) {
+  suspend_power_down_user();
+}
+
 /** \brief Power down
  *
  * FIXME: needs doc
@@ -103,6 +118,8 @@ static void power_down(uint8_t wdto)
 #endif
   rgblight_disable_noeeprom();
 #endif
+  suspend_power_down_kb();
+
     // TODO: more power saving
     // See PicoPower application note
     // - I/O port input with pullup
@@ -144,6 +161,21 @@ bool suspend_wakeup_condition(void)
      return false;
 }
 
+/** \brief run user level code immediately after wakeup
+ *
+ * FIXME: needs doc
+ */
+__attribute__ ((weak))
+void suspend_wakeup_init_user(void) { }
+
+/** \brief run keyboard level code immediately after wakeup
+ *
+ * FIXME: needs doc
+ */
+__attribute__ ((weak))
+void suspend_wakeup_init_kb(void) {
+  suspend_wakeup_init_user();
+}
 /** \brief run immediately after wakeup
  *
  * FIXME: needs doc
@@ -162,6 +194,7 @@ void suspend_wakeup_init(void)
   rgblight_timer_enable();
 #endif
 #endif
+  suspend_wakeup_init_kb();
 }
 
 #ifndef NO_SUSPEND_POWER_DOWN