usbd_core: add usb_device_is_suspend() API

- add usb_device_is_suspend() API

Signed-off-by: Zhihong Chen <zhihong.chen@hpmicro.com>

core/usbd_core.c

@@ -1360,6 +1360,11 @@ bool usb_device_is_configured(uint8_t busid)
     return g_usbd_core[busid].configuration;
 }
 
+bool usb_device_is_suspend(uint8_t busid)
+{
+    return g_usbd_core[busid].is_suspend;
+}
+
 int usbd_send_remote_wakeup(uint8_t busid)
 {
     if (g_usbd_core[busid].remote_wakeup_support && g_usbd_core[busid].remote_wakeup_enabled && g_usbd_core[busid].is_suspend) {

core/usbd_core.h

@@ -103,6 +103,7 @@ void usbd_add_endpoint(uint8_t busid, struct usbd_endpoint *ep);
 uint16_t usbd_get_ep_mps(uint8_t busid, uint8_t ep);
 uint8_t usbd_get_ep_mult(uint8_t busid, uint8_t ep);
 bool usb_device_is_configured(uint8_t busid);
+bool usb_device_is_suspend(uint8_t busid);
 int usbd_send_remote_wakeup(uint8_t busid);
 
 int usbd_initialize(uint8_t busid, uintptr_t reg_base, void (*event_handler)(uint8_t busid, uint8_t event));