Why do we need usb_modeswitch?

"Suresh Kumar N." <[email protected]>
Newsgroups org.kernel.vger.linux-hotplug
Message-ID <CALR+S1jo537Ov6EWp4Y19yuBek9-ZqregV3bch6iVZQoJVWqAA@mail.gmail.com> 
Hi,

I am new to udev and plug-n-play.

Please let me know -
1. Why do we need usb_modeswitch?
2. In case usb_modeswitch is used to just convert USB device to Serial
or Ethernet device (as per my understanding), then why not enumerate
the device as Serial or Ethernet device itself?

Good Day!

Warm Regards,
Suresh
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