Finding keyboards and mice and other devices

This is probably not a udev questin, but I hope someone can direct to a better place....

I am trying to scan the system to find all of the mice, keyboards, dvd drives, etc connected via usb.

I need to enumerate all of the devices connected to any USB hub by type. I can find devices in /sys but I don't know what they are....

Ideally I need a script that will tell me

2-4:1.0 keyboard
2-4:2.0 mouse
2-4:3.0 dvd player

Is there any way I can pull this from sysfs? Or set it up via udev?

Thanks,

--Yan