Merge branch 'master' into fork/ennebi/mtp

1 files changed, 14 insertions, 4 deletions

diff --git a/src/device/usbd.c b/src/device/usbd.c
index e5542914a..339ccf4b4 100644
--- a/src/device/usbd.c
+++ b/src/device/usbd.c
@@ -407,6 +407,18 @@ void usbd_control_set_request(tusb_control_request_t const *request);
 void usbd_control_set_complete_callback( usbd_control_xfer_cb_t fp );
 bool usbd_control_xfer_cb (uint8_t rhport, uint8_t ep_addr, xfer_result_t event, uint32_t xferred_bytes);
 
+//--------------------------------------------------------------------+
+// Weak stubs: invoked if no strong implementation is available
+//--------------------------------------------------------------------+
+TU_ATTR_WEAK usbd_class_driver_t const* usbd_app_driver_get_cb(uint8_t* driver_count) {
+  *driver_count = 0;
+  return NULL;
+}
+
+TU_ATTR_WEAK bool dcd_edpt_xfer_fifo(uint8_t rhport, uint8_t ep_addr, tu_fifo_t * ff, uint16_t total_bytes) {
+  (void) rhport; (void) ep_addr; (void) ff; (void) total_bytes;
+  return false;
+}
 
 //--------------------------------------------------------------------+
 // Debug
@@ -530,10 +542,8 @@ bool tud_rhport_init(uint8_t rhport, const tusb_rhport_init_t* rh_init) {
   TU_ASSERT(_usbd_q);
 
   // Get application driver if available
-  if (usbd_app_driver_get_cb) {
-    _app_driver = usbd_app_driver_get_cb(&_app_driver_count);
-    TU_ASSERT(_app_driver_count + BUILTIN_DRIVER_COUNT <= UINT8_MAX);
-  }
+  _app_driver = usbd_app_driver_get_cb(&_app_driver_count);
+  TU_ASSERT(_app_driver_count + BUILTIN_DRIVER_COUNT <= UINT8_MAX);
 
   // Init class drivers
   for (uint8_t i = 0; i < TOTAL_DRIVER_COUNT; i++) {