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usb: Implement GUD class #101446

@VynDragon

Description

@VynDragon

Is your feature request related to a problem? Please describe.

GUD class is for using USB devices as simple displays.
It is supported on Linux since 5.13.
It would be nice to have.

Describe the solution you'd like

GUD class is implemented in usb_next.

Protocol is described there: https://github.com/notro/gud/wiki/GUD-Protocol
and has examples there: https://github.com/samcday/gud-gadget?tab=readme-ov-file and in the Linux kernel.

Describe alternatives you've considered

No response

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