Community-contributed round 5 of the Steam Controller 2 passthrough,
reviewed + verified. A Puck-captured pad now presents the dongle's real
seven-interface identity (CDC pair, four controller HID slots, management
HID) instead of relabelling its reports as a wired 1302 — Steam's Puck
feature dances (wireless_transport / esb/bond / 0xB4 slot status) get
capture-shaped answers, and the wired identity's canned replies are
corrected to the real captures (attribute count, string-attr framing,
0xF2 firmware info, bcdDevice nibble encoding).
- new wire pref 10 = SteamController2Puck (Hello/Welcome byte; older
peers degrade to Auto), selected by the Android capture link when the
transport is a dongle, or by VID/PID in the degraded InputDevice path
- TRITON_RDESC is now the captured numbered descriptor (mouse/keyboard
lizard collections + per-id vendor reports); unnumbered framing made
hidraw mangle feature report 2 and Steam eventually closed the device
- interrupt-IN now queues sparse reports (battery/RSSI/wireless edges)
instead of keeping latest-only, so a 250 Hz state packet can no longer
erase them before the USB/IP poll observes them; EP0 SET_REPORT is
split by wValue report type (OUTPUT parsed for rumble vs FEATURE)
- vendored usbip-sim: config attributes/max-power, IAD prefix + BOS
descriptor support, correct BCD minor.patch encoding (Deck's 0x0300/
0x0200 values are nibble-zero, so its bytes are unchanged), and
full-speed interrupt pacing in ms (was 8 kHz from the HS formula)
- Triton feedback is serviced at 1 kHz while an SC2 backend exists so
Steam's trackpad haptic writes reach the client unbatched
Verified: clippy -D warnings + 319 host tests green on Linux, core wire
tests green, Android kit/app compile + unit tests green. On-glass Puck
retest owed.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Steam Deck pass-through (design/steam-deck-passthrough-plan.md), code-complete +
all CI checks green on Linux + adversarially reviewed; on-glass validation pending:
- usbip/`vhci_hcd` virtual Deck transport (inject/linux/steam_usbip.rs) for
non-SteamOS hosts (Bazzite/generic) — presents a real interface-2 USB Deck so
Steam Input promotes it. In-process vhci attach (loopback OP_REQ_IMPORT handshake
→ sysfs attach) with a bounded `usbip`-CLI fallback; detach on drop.
- Backed by a vendored, libusb-free trim of the `usbip` crate
(crates/punktfunk-host/vendor/usbip-sim, MIT + NOTICE; host/cdc/hid + rusb/nusb
removed; interrupt-IN paced by bInterval).
- Selection ladder raw_gadget (SteamOS fast-path) → usbip (universal) → UHID,
with PUNKTFUNK_STEAM_USBIP / PUNKTFUNK_USBIP_ATTACH knobs.
- Shared Deck descriptors + the 0x83/0xAE feature contract + a Steam-accepted
serial consolidated into steam_proto.rs; the raw_gadget backend reuses them.
- Linux client leave-shortcuts: Ctrl+Alt+Shift+D + holding the escape chord
(L1+R1+Start+Select) >=1.5s end the session (short press still exits
fullscreen); the chord state resets across sessions.
Also bundles in-progress work already staged in the tree:
- host(kwin): xdg-output logical-geometry mapping so the KWin fake_input backend
places absolute coordinates correctly under display scaling.
- docs: design/README index entries + design/controller-only-mode.md.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
enricobuehler