What: /config/usb-gadget/gadget/functions/uac1_legacy.name Date: Sep 2014 KernelVersion: 3.18 Description: The attributes: audio_buf_size - audio buffer size fn_cap - capture pcm device file name fn_cntl - control device file name fn_play - playback pcm device file name req_buf_size - ISO OUT endpoint request buffer size req_count - ISO OUT endpoint request count