/proc/1/root/sys/bus/usb/devices/usb2/ep_00/subsystem/usbdev2.1_ep81/device/

../
bAlternateSetting                4096
bInterfaceClass                  4096
bInterfaceNumber                 4096
bInterfaceProtocol               4096
bInterfaceSubClass               4096
bNumEndpoints                    4096
bus/
driver/
ep_81/
modalias                         4096
subsystem/
uevent                           4096
usb_endpoint:usbdev2.1_ep81/