Path: blob/master/Documentation/ABI/testing/configfs-usb-gadget-acm
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What: /config/usb-gadget/gadget/functions/acm.name Date: Jun 2013 KernelVersion: 3.11 Description: This item contains just one readonly attribute: port_num. It contains the port number of the /dev/ttyGS<n> device associated with acm function's instance "name". What: /config/usb-gadget/gadget/functions/acm.name/protocol Date: Aug 2024 KernelVersion: 6.13 Description: Reported bInterfaceProtocol for the ACM device. For legacy reasons, this defaults to 1 (USB_CDC_ACM_PROTO_AT_V25TER).