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1What: /config/usb-gadget/gadget/functions/uac1_legacy.name2Date: Sep 20143KernelVersion: 3.184Description:5 The attributes:6 7 audio_buf_size - audio buffer size8 fn_cap - capture pcm device file name9 fn_cntl - control device file name10 fn_play - playback pcm device file name11 req_buf_size - ISO OUT endpoint request buffer size12 req_count - ISO OUT endpoint request count13