Flesh out inject/proto/steam_proto.rs into the full Steam Deck HID contract,
transcribed verbatim from the kernel steam_do_deck_input_event /
steam_do_deck_sensors_event and validated field-for-field against kernel 7.0:
- SteamState: the u64 button map (bytes 8..16), sticks/triggers/trackpads/IMU
stored as raw little-endian report values; serialize_deck_state is a pure,
byte-exact memcpy into the 64-byte unnumbered frame.
- from_gamepad (XInput frame -> Deck buttons/sticks/triggers) + apply_rich
(RichInput touchpad -> right pad, motion -> IMU).
- parse_steam_output: the 0xEB ID_TRIGGER_RUMBLE_CMD feedback -> (low, high)
for the universal rumble plane.
- serial_reply fixed: prepend the report-id-0 byte the kernel strips
(steam_recv_report does memcpy(data, buf+1, ...)); M0's reply lacked it, so
the kernel fell back to the "XXXXXXXXXX" serial.
- SteamModel (Deck now; classic Controller later), command/feature IDs.
The spike is repurposed as the M1 validator: it pulses the b9.6 mode-switch to
enter gamepad_mode (steam_do_deck_input_event early-returns under the default
lizard_mode otherwise), then holds a known test pattern. Reading both evdevs via
EVIOCGABS/EVIOCGKEY, every field matched: ABS_X/Y/RX/RY (incl. the kernel
Y-negation), both triggers, the touched right-pad HAT1X/Y, the IMU accel/gyro
(with ABS_Z/RZ negations), and the 6 expected buttons incl. the L4/R5 grips.
5 unit tests + workspace clippy/fmt/test green. Next: M2 (SteamControllerManager
UHID backend + PadBackend wiring). Not pushed — pipeline not yet shippable.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
enricobuehler
9ff7d41bfe