usb: gadget: f_uac2: allow changing interface name via configfs
This adds "function_name" configfs entry to change string value of the iInterface field. This field will be shown in Windows' audio settings panel, so being able to change it is useful. It will default to "Source/Sink" just as before. Signed-off-by: Yunhao Tian <t123yh.xyz@gmail.com> Link: https://lore.kernel.org/r/20220122112446.1415547-2-t123yh.xyz@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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