Notifying MTP class-specific requests

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Hi,

I have a MTP USB function driver and want to notify to userspace
about class-specific requests (get device status, cancel request,
device reset, as per PIMA15740 specification) received by the
driver. What is the best way to pass these control events to user
space?

The current implementation of the driver uses a signal (using
send_sig_info()) to pass the ID of the request to userspace, but
that solution doesn't look clean to me, maybe I'm wrong. Anyway I
guess there may be a standard way to make this kind of notifications.

Thanks,
-Misa
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