Hello-

I don't know if I like the idea of needing a udev/hotplug script to map
my camera features.  However, I reviewed dynctrl.txt it seems
reasonable.  

I just had one question:  

>       __u32   flags           See below
> 
>       * struct uvc_xu_control_info flags field
> 
>       UVC_CONTROL_SET_CUR     Control is writable.
>       UVC_CONTROL_GET_CUR     Control is readable.
>       UVC_CONTROL_GET_MIN     Control supports GET MIN queries.
>       UVC_CONTROL_GET_MAX     Control supports GET MAX queries.
>       UVC_CONTROL_GET_RES     Control supports GET RES queries.
>       UVC_CONTROL_GET_DEF     Control supports GET DEF queries.
>       UVC_CONTROL_RESTORE     Control should be restored when resuming from
>                               sleep.

Quoting the UVC spec:

"All controls supported by the Extension Unit must support the following
requests: GET_CUR, GET_MIN, GET_MAX, GET_RES, GET_INFO, GET_DEF,
GET_LEN"

And the driver can find out about SET_CUR via GET_INFO.  So, besides
RESTORE what is this flag field needed for?

Thanks,

        Brandon

P.S. Is there a Logitech XU spec sheet somewhere?  It would be nice to
have information on the controls on my device.

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