Support hot unplugging

include/grub/term.h

@@ -459,6 +459,7 @@ grub_print_spaces (struct grub_term_output *term, int number_spaces)
     grub_putcode (' ', term);
 }
 
+extern void (*EXPORT_VAR (grub_term_poll_usb)) (void);
 
 /* For convenience.  */
 #define GRUB_TERM_ASCII_CHAR(c)	((c) & 0xff)

include/grub/usb.h

@@ -177,6 +177,12 @@ struct grub_usb_device
 
   /* Data toggle values (used for bulk transfers only).  */
   int toggle[256];
+
+  /* Array of children for a hub.  */
+  grub_usb_device_t *children;
+
+  /* Number of hub ports.  */
+  unsigned nports;
 };