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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).