I think, hotplug just processes the hot plug events, but not existed devices.

Once hotplug is registered - it has to report all existing devices.

The likely alternative you probably want to have is:

enumerate existing devices;
register callback for new devices;

Or the other way around (first register callback, then enumerate existing devices).

In either case you're having a race condition if the device is plugged at the moment you're registering a callback (and that is happening more often than you could imagine).
You either miss a device or have it reported twice.

The only 100% reliable way to use device hotplug events - is to use only hotplug callback events to get a list of all devices (existing and new).
And not use things like hid_enumerate at all.

Add hotplug support #238

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