device (in much the same way as the "loop" device driver),
specified as a module parameter or sysfs option.
+config USB_CONFIGFS_F_LB_SS
+ boolean "Loopback and sourcesink function (for testing)"
+ depends on USB_CONFIGFS
+ select USB_F_SS_LB
+ help
+ Loopback function loops back a configurable number of transfers.
+ Sourcesink function either sinks and sources bulk data.
+ It also implements control requests, for "chapter 9" conformance.
+ Make this be the first driver you try using on top of any new
+ USB peripheral controller driver. Then you can use host-side
+ test software, like the "usbtest" driver, to put your hardware
+ and its driver through a basic set of functional tests.
+
config USB_ZERO
tristate "Gadget Zero (DEVELOPMENT)"
select USB_LIBCOMPOSITE