Doubt in USB Drivers

[me storage]

Hi to all
I am new to Linux Kernel Programming .I want to develop usb drivers so i
read LDD3 Chapter 14. i didn't find /sbin/hotplug in Ubuntu 12.04.And my
doubt is how kernel handles the usb devices i.e who detects usb events
,then who fires hotplug script to run ,where kernel searches corresponding
module ,who loads the modules etc...
Any resources are helpful to me
Thanks to all
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