[Bug 252434] for USB audio headset, need do set interface dynamiclly for power save and correct status of headsets

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252434

            Bug ID: 252434
           Summary: for USB audio headset, need do set interface
                    dynamiclly for power save and correct status of
                    headsets
           Product: Base System
           Version: Unspecified
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: usb
          Assignee: usb at FreeBSD.org
          Reporter: shichun_ma at dell.com

Created attachment 221286
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=221286&action=edit
patch to add set interface dynamicly.

1. set interface 0 and alt number when headset stop/start working is quite
standard on windows/Linux OS
2. set interface 0 when not headset doesn't work can help power save;
3. some Epos headset tool check will check the headset status by polling it's
current alt interface, and "0" set interface alt stands that headset is idle,
so EPOS application do can do firmware update for this device.

Base above comment, it's good deal to add this patch.

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