Cross-referenced with Linux 7.1 tty_port_register_device() pattern.
New scheme.rs module:
- AcmScheme implements SchemeSync with Mutex-wrapped XhciEndpHandle
- openat(): root dir listing + device file open (O_RDWR)
- read(): USB bulk IN → scheme client (getty, terminal)
- write(): scheme client → USB bulk OUT
- close(): decrements open count
- fsync(): no-op
main.rs:
- #[cfg(target_os = redox)]: Socket::create() + register scheme
under /scheme/ttys/usbACM_<port_id>, process requests with
handle_scheme_mut() in event loop
- #[cfg(not(target_os = redox))]: stdout fallback for testing
This enables getty to open /scheme/ttys/usbACM_<N> as a serial
console on USB CDC ACM devices — the driver is now a proper
Redox scheme service, not just a stdout debugging tool.
Pattern replicable for redbear-ftdi (same scheme:ttys), redbear-ecmd
(scheme:net), and redbear-usbaudiod (scheme:audio).
vasilito
726e628e0d