diff options
| -rw-r--r-- | drivers/usb/core/usb.c | 10 | ||||
| -rw-r--r-- | include/linux/usb.h | 2 |
2 files changed, 10 insertions, 2 deletions
diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c index 020b58528d9..f026991d0bd 100644 --- a/drivers/usb/core/usb.c +++ b/drivers/usb/core/usb.c @@ -375,18 +375,24 @@ struct usb_device *usb_alloc_dev(struct usb_device *parent, */ if (unlikely(!parent)) { dev->devpath[0] = '0'; + dev->route = 0; dev->dev.parent = bus->controller; dev_set_name(&dev->dev, "usb%d", bus->busnum); root_hub = 1; } else { /* match any labeling on the hubs; it's one-based */ - if (parent->devpath[0] == '0') + if (parent->devpath[0] == '0') { snprintf(dev->devpath, sizeof dev->devpath, "%d", port1); - else + /* Root ports are not counted in route string */ + dev->route = 0; + } else { snprintf(dev->devpath, sizeof dev->devpath, "%s.%d", parent->devpath, port1); + dev->route = parent->route + + (port1 << ((parent->level - 1)*4)); + } dev->dev.parent = &parent->dev; dev_set_name(&dev->dev, "%d-%s", bus->busnum, dev->devpath); diff --git a/include/linux/usb.h b/include/linux/usb.h index fb1f2a32ae0..2b380a16c62 100644 --- a/include/linux/usb.h +++ b/include/linux/usb.h @@ -362,6 +362,7 @@ struct usb_tt; * struct usb_device - kernel's representation of a USB device * @devnum: device number; address on a USB bus * @devpath: device ID string for use in messages (e.g., /port/...) + * @route: tree topology hex string for use with xHCI * @state: device state: configured, not attached, etc. * @speed: device speed: high/full/low (or error) * @tt: Transaction Translator info; used with low/full speed dev, highspeed hub @@ -427,6 +428,7 @@ struct usb_tt; struct usb_device { int devnum; char devpath [16]; + u32 route; enum usb_device_state state; enum usb_device_speed speed; |