What: /sys/class/mux/ Date: April 2017 KernelVersion: 4.13 Contact: Peter Rosin Description: The mux/ class sub-directory belongs to the Generic MUX Framework and provides a sysfs interface for using MUX controllers. What: /sys/class/mux/muxchip/ Date: April 2017 KernelVersion: 4.13 Contact: Peter Rosin Description: A /sys/class/mux/muxchipN directory is created for each probed MUX chip where N is a simple enumeration.