LED subsystem supports POLLPRI on "brightness_hw_changed" sysfs file
of LED class devices. This tool demonstrates how to use the feature.
Signed-off-by: NJacek Anaszewski <jacek.anaszewski@gmail.com>
Acked-by: NHans de Goede <hdegoede@redhat.com>
Acked-by: NPavel Machek <pavel@ucw.cz>