a simple interface consisting of a character device and a set of sysfs files:
See:
-Documentation/ABI/testing/sysfs-class-fieldbus-dev
-Documentation/ABI/testing/fieldbus-dev-cdev
+drivers/staging/fieldbus/Documentation/ABI/sysfs-class-fieldbus-dev
+drivers/staging/fieldbus/Documentation/ABI/fieldbus-dev-cdev
Note that this simple interface does not provide a way to modify adapter
configuration settings. It is therefore useful only for adapters that get their