Make the virtual hid-steam device a selectable per-session host gamepad,
end-to-end on Linux: PUNKTFUNK_GAMEPAD=steamdeck now builds a
SteamControllerManager that creates a /dev/uhid 28DE:1205 Deck, enters
gamepad_mode, and feeds the byte-exact Deck report (M1).
- inject/linux/steam_controller.rs: SteamControllerManager / SteamDeckPad,
mirroring dualsense.rs (open/create2, GET/SET_REPORT pump, heartbeat, RAII
destroy). Two Steam-specific quirks beyond the DualSense path:
* gamepad_mode entry — best-effort `lizard_mode=0` via sysfs, plus a b9.6
creation pulse (MODE_ENTER) so steam_do_deck_input_event stops
early-returning, plus an anti-toggle guard (MENU_HOLD_CAP) so a long
in-game Start-hold can't flip gamepad_mode back off.
* UHID_SET_REPORT answered err=0 (DualSense omits it; the kernel stalls
~5s/cmd otherwise); the 0xEB rumble report parsed onto the 0xCA plane.
- core config.rs: GamepadPref::SteamDeck (wire byte 6) + SteamController
(byte 5, reserved — folds to Xbox360 until its backend lands); from_u8 /
from_name / as_str. Forward-compatible (unknown byte -> Auto); the C-ABI
PUNKTFUNK_GAMEPAD_* constants stay M3, so no generated-header drift.
- punktfunk1.rs: PadBackend::SteamDeck variant + select / handle / apply_rich
/ pump / heartbeat arms; pick_gamepad Linux arm.
On-box: an #[ignore]d backend test (backend_binds_and_input_flows) drives the
real SteamDeckPad — it binds hid-steam (gamepad + IMU evdevs), enters gamepad
mode, BTN_A reaches the evdev, and the device tears down on drop. Workspace
clippy/fmt/test green. Not pushed. Next: M3 (protocol/ABI wire) + M4 (client
capture).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
enricobuehler
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