How do I make a modalias for my usb device?

Bus 008 Device 002: ID 0a5c:21e8 Broadcom Corp. BCM20702A0 Bluetooth 4.0

Any idea, because i need to make one so it auto loads the bluetooth firmware.

If the working! frrmware is there, it will be loaded.

But I was affected by an firmware Version, which does not work with my old Bluetooth Stck.
The newer and also oldest were working…
But for my old Stick.