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What:		/config/usb-gadget/gadget/functions/uac1.name
Date:		June 2017
KernelVersion:	4.14
Description:
		The attributes:

		==========	===================================
		c_chmask	capture channel mask
		c_srate		capture sampling rate
		c_ssize		capture sample size (bytes)
		p_chmask	playback channel mask
		p_srate		playback sampling rate
		p_ssize		playback sample size (bytes)
		req_number	the number of pre-allocated request
				for both capture and playback
		==========	===================================