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It is possible to switch the USB function from host to gadget on Linux. This can be done using the "gadgetfs" filesystem, which provides a way to create a USB gadget that can be used by a host computer.

However, it requires specific hardware that supports USB OTG (On-The-Go) mode or a USB gadget controller, which not all devices have. Additionally, switching between host and gadget mode requires changing the device's configuration, which may not be easily accessible or user-friendly in some cases.

In short, it is possible to switch the USB function from host to gadget on Linux, but it depends on the hardware and the device's configuration.