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