Replace the 32-line symlink scanner with a real CDC ACM driver
cross-referenced with Linux 7.1 drivers/usb/class/cdc-acm.c.
Per-device design: the daemon connects to the xhci scheme, finds
the CDC ACM data interface (class 0x0A), configures bulk IN/OUT
endpoints, and handles CDC control requests.
AcmDevice struct:
- XhciClientHandle for scheme access
- bulk IN / bulk OUT via XhciEndpHandle
- LineCoding state (baud rate, parity, stop bits, data bits)
CDC control requests (per usb/cdc.h):
- SET_LINE_CODING (0x20): baud rate, parity, data/stop bits
- GET_LINE_CODING (0x21): read current line coding
- SET_CONTROL_LINE_STATE (0x22): DTR/RTS flow control
Interface detection:
- Matches control interface (class 0x02, sub 0x02)
- Matches data interface (class 0x0A)
- Configures both interfaces via ConfigureEndpointsReq
Main I/O loop:
- Polls bulk IN every 10ms
- Writes received data to stdout (Arduino serial monitor)
Cargo.toml updated with xhcid, common, and libredox deps.
Cross-reference: Linux 7.1
- drivers/usb/class/cdc-acm.c (2,186 lines)
- include/uapi/linux/usb/cdc.h: CDC control request defines
vasilito
19829958db