core: Add hook_usb_startup_wait_loop

tmk_core/common/hook.h

@@ -21,6 +21,10 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "keyboard.h"
 #include "led.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /* -------------------------------------
  * Protocol hooks
  * ------------------------------------- */
@@ -47,6 +51,10 @@ void hook_usb_suspend_loop(void);
  * the "normal" indicator LED status by default. */
 void hook_usb_wakeup(void);
 
+/* Called repeatedly until getting to CONFIGURED state */
+/* Default behaviour: do nothing. */
+void hook_usb_startup_wait_loop(void);
+
 
 /* -------------------------------------
  * Keyboard hooks
@@ -76,5 +84,8 @@ void hook_keyboard_leds_change(uint8_t led_status);
 /* Default behaviour: do nothing. */
 void hook_bootmagic(void);
 
+#ifdef __cplusplus
+}
+#endif
 
 #endif /* _HOOKS_H_ */

tmk_core/common/suspend.h

@@ -5,9 +5,17 @@
 #include <stdbool.h>
 
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 void suspend_idle(uint8_t timeout);
 void suspend_power_down(void);
 bool suspend_wakeup_condition(void);
 void suspend_wakeup_init(void);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif