samples: usb: add samples function to setup USB device only

Add a function similar to sample_usbd_init_device(), but one that does
not initialize the device. It allows the application to set additional
features, such as additional descriptors.

Signed-off-by: Johann Fischer <[email protected]>

Author: jfischer-no

samples/subsys/usb/common/sample_usbd.h

@@ -29,4 +29,11 @@
  */
 struct usbd_context *sample_usbd_init_device(usbd_msg_cb_t msg_cb);
 
+/*
+ * This function is similar to sample_usbd_init_device(), but does not
+ * initialize the device. It allows the application to set additional features,
+ * such as additional descriptors.
+ */
+struct usbd_context *sample_usbd_setup_device(usbd_msg_cb_t msg_cb);
+
 #endif /* ZEPHYR_SAMPLES_SUBSYS_USB_COMMON_SAMPLE_USBD_H */

samples/subsys/usb/common/sample_usbd_init.c

@@ -86,7 +86,7 @@ static void sample_fix_code_triple(struct usbd_context *uds_ctx,
 	}
 }
 
-struct usbd_context *sample_usbd_init_device(usbd_msg_cb_t msg_cb)
+struct usbd_context *sample_usbd_setup_device(usbd_msg_cb_t msg_cb)
 {
 	int err;
 
@@ -173,6 +173,17 @@ struct usbd_context *sample_usbd_init_device(usbd_msg_cb_t msg_cb)
 		}
 	}
 
+	return &sample_usbd;
+}
+
+struct usbd_context *sample_usbd_init_device(usbd_msg_cb_t msg_cb)
+{
+	int err;
+
+	if (sample_usbd_setup_device(msg_cb) == NULL) {
+		return NULL;
+	}
+
 	/* doc device init start */
 	err = usbd_init(&sample_usbd);
 	if (err) {