Keep the rich Steam inputs from silently dropping when the resolved backend
isn't the virtual hid-steam device, and fix a cross-device motion-scale bug.
- inject/proto/steam_remap.rs (new, pure + unit-tested):
* motion_wire_to_deck — the wire carries DualSense-convention units (20 LSB/
deg.s gyro, 10000 LSB/g accel — what every client capture emits), but the
Deck's hid-steam report wants 16 LSB/deg.s + 16384 LSB/g. The Deck backend
now rescales (gyro x16/20, accel x16384/10000): a real Deck<->Deck gyro/
accel correctness fix (the DualSense/DS4 backends consume the wire 1:1).
* fold_paddles + RemapConfig (PUNKTFUNK_STEAM_REMAP=paddles=drop|stickclicks|
shoulders, default drop) — the DualSense + DS4 managers fold a client's back
grips onto standard buttons rather than dropping them (those pads have no
back-button HID slot; the uinput Xbox pad already exposes them as Elite
paddles BTN_TRIGGER_HAPPY5-8).
- resolve_gamepad: a runtime degrade ladder — a UHID backend (DualSense / DS4 /
Steam Deck) on a host where /dev/uhid isn't writable now falls back to the
uinput Xbox 360 pad instead of a dead controller (the device-create would
just fail). Separate from pick_gamepad's compile-time platform check, so the
existing pick_gamepad tests are untouched.
- Delete the throwaway M0/M1 spike (src/bin/steam_uhid_spike.rs) — M2's
#[ignore]d backend test subsumes its validation, and removing it frees
steam_proto to reference steam_remap cleanly.
On-box backend test still green; workspace clippy/fmt/test green (incl. the new
steam_remap tests). Deferred as optional RemapConfig growth: gyro->mouse /
trackpad->stick synthesis on an Xbox target (no slot — documented drop today).
Not pushed.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
enricobuehler
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