Modern USB Gadget with Custom USB Functions & its Integration with systemd
summary
Linux composes USB gadgets at runtime with configfs instead of kernel modules, uses FunctionFS to implement custom functions in userspace, and integrates gadget lifecycle with systemd via a gadget.target, udc availability deferral, plus load/enable service, mount and socket units. The demo uses the gt gadget tool to load an MTP scheme and launches the cMTP responder on an Odroid U2; a photo is copied over successfully, proving the setup works.
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chapters (9)
- 0:00Start
- 9:21Configfs
- 13:11The "glue layer"
- 15:12Service unit templatized
- 15:51FunctionFS vs systemd
- 17:42Mount unit
- 18:22Socket unit
- 20:30Descriptors and strings
- 21:12MTP Device
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