diff options
Diffstat (limited to 'src/include')
| -rw-r--r-- | src/include/ipxe/usb.h | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/src/include/ipxe/usb.h b/src/include/ipxe/usb.h index f41f4c355..911247ede 100644 --- a/src/include/ipxe/usb.h +++ b/src/include/ipxe/usb.h @@ -1239,6 +1239,23 @@ usb_set_interface ( struct usb_device *usb, unsigned int interface, NULL, 0 ); } +/** + * Get USB depth + * + * @v usb USB device + * @ret depth Hub depth + */ +static inline unsigned int usb_depth ( struct usb_device *usb ) { + struct usb_device *parent; + unsigned int depth; + + /* Navigate up to root hub, constructing depth as we go */ + for ( depth = 0 ; ( parent = usb->port->hub->usb ) ; usb = parent ) + depth++; + + return depth; +} + extern struct list_head usb_buses; extern struct usb_interface_descriptor * @@ -1274,7 +1291,6 @@ extern struct usb_bus * find_usb_bus_by_location ( unsigned int bus_type, extern int usb_alloc_address ( struct usb_bus *bus ); extern void usb_free_address ( struct usb_bus *bus, unsigned int address ); extern unsigned int usb_route_string ( struct usb_device *usb ); -extern unsigned int usb_depth ( struct usb_device *usb ); extern struct usb_port * usb_root_hub_port ( struct usb_device *usb ); extern struct usb_port * usb_transaction_translator ( struct usb_device *usb ); |