feat(host/steam): M0 — virtual hid-steam UHID device binds + parses (Linux)
Greenfield virtual Steam Deck controller, the Steam analogue of the shipped virtual DualSense. Proves the kernel hid-steam driver binds a /dev/uhid 28DE:1205 device, registers it as a real Steam Deck, and parses our input reports — the go/no-go gate for the full Steam Controller/Deck pipeline. - inject/proto/steam_proto.rs: keeper module — the vendor HID descriptor (one feature report, the sole thing steam_is_valve_interface() checks), the command/feature IDs, serialize_deck_state, and the serial GET_REPORT reply. Unit-tested. - src/bin/steam_uhid_spike.rs: throwaway M0 spike (Linux-only) — opens /dev/uhid, creates the device, services the handshake including UHID_SET_REPORT (which the DualSense backend omits and which hid-steam stalls ~5s/cmd without), and heartbeats a neutral report. - design/steam-controller-deck-support.md: full design + M0–M7 plan; the two walls (Steam Input capture ownership; virtual-Steam recognition) and the fidelity ceiling. Status: M0 GREEN. On-box (headless Ubuntu 26.04, kernel 7.0, no Steam): journalctl -k shows hid-steam binding the device (rebind off hid-generic), "Steam Controller connected", and the kernel creating BOTH a "Steam Deck" gamepad evdev and a "Steam Deck Motion Sensors" IMU evdev (INPUT_PROP_ACCELEROMETER). A layout-agnostic mash-probe drove 23 distinct BTN_* codes through hid-steam -> evdev, proving the input-report parse path. M1 line-checks the exact per-bit report layout against the lab kernel. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
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//! M0 recognition spike (THROWAWAY) — `design/steam-controller-deck-support.md` go/no-go gate.
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//!
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//! Opens `/dev/uhid`, creates a virtual `28DE:1205` Steam Deck controller using
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//! [`steam_proto::STEAMDECK_RDESC`], services the kernel handshake (the three event types the
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//! DualSense backend does NOT: `UHID_SET_REPORT` must be answered or `hid-steam` stalls ~5 s/cmd),
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//! answers `steam_get_serial`, heartbeats a neutral Deck report at 125 Hz, and toggles `BTN_A`
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//! every 500 ms so a button event is observable.
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//!
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//! PASS (GO): `dmesg` shows `hid-steam` binding the device; both a gamepad evdev and an IMU evdev
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//! (`INPUT_PROP_ACCELEROMETER`) appear; an evdev reader sees `BTN_A` toggle. Run:
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//! `cargo run -p punktfunk-host --bin steam_uhid_spike -- [seconds]`
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//!
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//! This binary is deleted once M1's `inject/linux/steam_controller.rs` subsumes it.
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#[cfg(target_os = "linux")]
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#[path = "../inject/proto/steam_proto.rs"]
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mod steam_proto;
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#[cfg(target_os = "linux")]
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fn main() -> anyhow::Result<()> {
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use anyhow::Context;
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use std::fs::OpenOptions;
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use std::io::{Read, Write};
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use std::os::unix::fs::OpenOptionsExt;
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use std::time::{Duration, Instant};
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use steam_proto::{
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serial_reply, serialize_deck_state, SteamState, STEAMDECK_PRODUCT, STEAMDECK_RDESC,
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STEAM_REPORT_LEN, STEAM_VENDOR,
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};
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// /dev/uhid event ABI (linux/uhid.h): a u32 `type` then a __packed union (largest member is
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// uhid_create2_req). Field offsets below are union-start (event byte 4) + struct offset.
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const EVENT_SIZE: usize = 4 + 4372;
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const UHID_DESTROY: u32 = 1;
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const UHID_START: u32 = 2;
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const UHID_STOP: u32 = 3;
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const UHID_OPEN: u32 = 4;
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const UHID_CLOSE: u32 = 5;
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const UHID_OUTPUT: u32 = 6;
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const UHID_GET_REPORT: u32 = 9;
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const UHID_GET_REPORT_REPLY: u32 = 10;
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const UHID_CREATE2: u32 = 11;
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const UHID_INPUT2: u32 = 12;
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const UHID_SET_REPORT: u32 = 13;
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const UHID_SET_REPORT_REPLY: u32 = 14;
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const BUS_USB: u16 = 0x03;
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let seconds: u64 = std::env::args()
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.nth(1)
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.and_then(|s| s.parse().ok())
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.unwrap_or(25);
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let mut fd = OpenOptions::new()
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.read(true)
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.write(true)
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.custom_flags(libc::O_NONBLOCK)
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.open("/dev/uhid")
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.context("open /dev/uhid (are you in the 'input' group?)")?;
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// --- UHID_CREATE2: identity + report descriptor ---
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let put_cstr = |ev: &mut [u8], off: usize, cap: usize, s: &str| {
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let n = s.len().min(cap - 1);
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ev[off..off + n].copy_from_slice(&s.as_bytes()[..n]);
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};
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let mut ev = vec![0u8; EVENT_SIZE];
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ev[0..4].copy_from_slice(&UHID_CREATE2.to_ne_bytes());
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put_cstr(&mut ev, 4, 128, "Punktfunk Steam Deck (M0 spike)"); // name[128]
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put_cstr(&mut ev, 132, 64, "punktfunk/steam/0"); // phys[64]
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put_cstr(&mut ev, 196, 64, "punktfunk-steam-0"); // uniq[64]
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ev[260..262].copy_from_slice(&(STEAMDECK_RDESC.len() as u16).to_ne_bytes()); // rd_size
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ev[262..264].copy_from_slice(&BUS_USB.to_ne_bytes()); // bus
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ev[264..268].copy_from_slice(&STEAM_VENDOR.to_ne_bytes()); // vendor
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ev[268..272].copy_from_slice(&STEAMDECK_PRODUCT.to_ne_bytes()); // product
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ev[272..276].copy_from_slice(&0x0100u32.to_ne_bytes()); // version
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ev[276..280].copy_from_slice(&0u32.to_ne_bytes()); // country
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ev[280..280 + STEAMDECK_RDESC.len()].copy_from_slice(STEAMDECK_RDESC);
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fd.write_all(&ev).context("write UHID_CREATE2")?;
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eprintln!(
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"UHID_CREATE2 -> 28DE:1205 \"Punktfunk Steam Deck (M0 spike)\", {} byte rdesc; running {seconds}s",
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STEAMDECK_RDESC.len()
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);
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let (mut starts, mut opens, mut gets, mut sets, mut outputs) = (0u32, 0u32, 0u32, 0u32, 0u32);
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let mut seq: u32 = 0;
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let mut a_down = false;
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let start = Instant::now();
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let mut last_hb = start;
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let mut last_toggle = start;
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let mut rbuf = vec![0u8; EVENT_SIZE];
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while start.elapsed() < Duration::from_secs(seconds) {
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// Drain all pending kernel events; reply to the handshake (O_NONBLOCK → WouldBlock = empty).
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while let Ok(n) = fd.read(&mut rbuf) {
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if n < 4 {
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break;
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}
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match u32::from_ne_bytes([rbuf[0], rbuf[1], rbuf[2], rbuf[3]]) {
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UHID_START => {
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starts += 1;
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eprintln!(" <- UHID_START");
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}
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UHID_OPEN => {
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opens += 1;
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eprintln!(" <- UHID_OPEN (a consumer opened the evdev/hidraw)");
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}
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UHID_STOP => eprintln!(" <- UHID_STOP"),
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UHID_CLOSE => eprintln!(" <- UHID_CLOSE"),
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UHID_OUTPUT => {
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outputs += 1;
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let sz = u16::from_ne_bytes([rbuf[4100], rbuf[4101]]) as usize;
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eprintln!(
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" <- UHID_OUTPUT ({sz} bytes, head={:02X?})",
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&rbuf[4..4 + sz.min(8)]
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);
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}
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UHID_GET_REPORT => {
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gets += 1;
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let id = u32::from_ne_bytes([rbuf[4], rbuf[5], rbuf[6], rbuf[7]]);
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let rnum = rbuf[8];
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let reply = serial_reply("PUNKTFUNK01");
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let mut out = vec![0u8; EVENT_SIZE];
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out[0..4].copy_from_slice(&UHID_GET_REPORT_REPLY.to_ne_bytes());
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out[4..8].copy_from_slice(&id.to_ne_bytes()); // id
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out[8..10].copy_from_slice(&0u16.to_ne_bytes()); // err = 0
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out[10..12].copy_from_slice(&(reply.len() as u16).to_ne_bytes()); // size
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out[12..12 + reply.len()].copy_from_slice(&reply);
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fd.write_all(&out).context("write GET_REPORT_REPLY")?;
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eprintln!(" <- UHID_GET_REPORT (rnum={rnum}) -> replied serial");
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}
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UHID_SET_REPORT => {
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sets += 1;
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let id = u32::from_ne_bytes([rbuf[4], rbuf[5], rbuf[6], rbuf[7]]);
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let rnum = rbuf[8];
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let cmd = rbuf[12]; // data[0] = the Steam command id
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let mut out = vec![0u8; EVENT_SIZE];
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out[0..4].copy_from_slice(&UHID_SET_REPORT_REPLY.to_ne_bytes());
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out[4..8].copy_from_slice(&id.to_ne_bytes()); // id
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out[8..10].copy_from_slice(&0u16.to_ne_bytes()); // err = 0 (ack)
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fd.write_all(&out).context("write SET_REPORT_REPLY")?;
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eprintln!(" <- UHID_SET_REPORT (rnum={rnum}, cmd=0x{cmd:02X}) -> ack err=0");
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}
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other => eprintln!(" <- UHID event type {other}"),
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}
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}
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// Heartbeat the current state at ~125 Hz (a real Deck streams continuously; silence reads
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// as an unplug to the kernel/SDL).
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if last_hb.elapsed() >= Duration::from_millis(8) {
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last_hb = Instant::now();
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seq = seq.wrapping_add(1);
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let mut st = SteamState::neutral();
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if a_down {
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// M0 parse-path probe: mash every button byte so SOME BTN_* fires regardless of the
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// exact (M1-confirmed) per-bit mapping — proves hid-steam parses our state reports.
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st.b8 = 0xFF;
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st.b9 = 0xFF;
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st.b10 = 0xFF;
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st.b13 = 0xFF;
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st.b14 = 0xFF;
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}
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let mut r = [0u8; STEAM_REPORT_LEN];
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serialize_deck_state(&mut r, &st, seq);
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let mut out = vec![0u8; EVENT_SIZE];
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out[0..4].copy_from_slice(&UHID_INPUT2.to_ne_bytes());
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out[4..6].copy_from_slice(&(r.len() as u16).to_ne_bytes()); // input2.size
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out[6..6 + r.len()].copy_from_slice(&r); // input2.data
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fd.write_all(&out).context("write UHID_INPUT2")?;
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}
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// Toggle BTN_A every 500 ms so an evdev reader sees a key event.
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if last_toggle.elapsed() >= Duration::from_millis(500) {
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last_toggle = Instant::now();
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a_down = !a_down;
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eprintln!("BTN_A -> {}", if a_down { "DOWN" } else { "UP" });
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}
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std::thread::sleep(Duration::from_millis(1));
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}
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let mut out = vec![0u8; EVENT_SIZE];
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out[0..4].copy_from_slice(&UHID_DESTROY.to_ne_bytes());
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let _ = fd.write_all(&out);
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eprintln!(
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"UHID_DESTROY. handshake counts: START={starts} OPEN={opens} GET_REPORT={gets} SET_REPORT={sets} OUTPUT={outputs}"
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);
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Ok(())
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}
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#[cfg(not(target_os = "linux"))]
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fn main() {
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eprintln!("steam_uhid_spike: Linux-only (needs /dev/uhid + the hid-steam kernel driver)");
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}
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@@ -0,0 +1,183 @@
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//! Transport-independent Steam Controller / Steam Deck HID contract — the Steam analogue of
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//! [`super::dualsense_proto`]. Descriptor, command/feature IDs, the serial GET_REPORT reply, and
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//! the input-report serializer that the kernel `hid-steam` driver parses.
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//!
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//! **M0 scope (recognition spike):** only what is needed for `hid-steam` to bind a `/dev/uhid`
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//! `28DE:1205` device and create its evdevs —
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//! * [`STEAMDECK_RDESC`]: a vendor collection with ≥1 **feature** report, which is the *sole*
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//! thing `steam_is_valve_interface()` checks (`!list_empty(&FEATURE.report_list)`);
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//! * [`serial_reply`]: the `steam_get_serial()` answer `[0xAE, len, 0x01, ascii…]` (a bad/absent
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//! reply is non-fatal — the kernel falls back to `"XXXXXXXXXX"` — but a valid one keeps probe
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//! instant);
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//! * [`serialize_deck_state`]: a neutral Deck state report whose header (`[0x01,0x00,0x09,len]`)
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//! `hid-steam` accepts and parses (the M0 spike proved 23 distinct `BTN_*` codes reach the
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//! evdev). The exact per-bit button offsets below are PROVISIONAL — M1 confirms them
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//! line-by-line against the lab kernel's `steam_do_deck_input_event` (the v6.12-sourced
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//! `byte 8 bit 7 = BTN_A` did NOT match on the 7.0 box).
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//!
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//! The **full** field layout (sticks, triggers, both trackpads, the IMU, all four back grips, the
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//! `0xEB`/`0x8F` feedback reports) lands in M1, line-checked against the lab kernel's
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//! `steam_do_deck_input_event` / `steam_haptic_rumble` — see `design/steam-controller-deck-support.md`.
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#![allow(dead_code)] // M0: the full state model + the PadBackend wiring arrive in M1.
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/// Valve. `hid-steam` matches purely by VID/PID over `BUS_USB`
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/// (`HID_USB_DEVICE(0x28DE, 0x1205, STEAM_QUIRK_DECK)`), so a UHID device with these IDs binds.
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pub const STEAM_VENDOR: u32 = 0x28DE;
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/// Steam Deck built-in controller (same PID on LCD + OLED).
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pub const STEAMDECK_PRODUCT: u32 = 0x1205;
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/// Classic Steam Controller, wired (report id 1; a later identity behind the same manager).
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pub const STEAMCTRL_WIRED_PRODUCT: u32 = 0x1102;
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/// The Steam HID state/command report is a fixed 64-byte, **unnumbered** (report-id-0) frame.
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pub const STEAM_REPORT_LEN: usize = 64;
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// Command IDs (drivers/hid/hid-steam.c), confirmed against the kernel source.
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pub const ID_CLEAR_DIGITAL_MAPPINGS: u8 = 0x81;
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pub const ID_GET_ATTRIBUTES_VALUES: u8 = 0x83;
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pub const ID_SET_SETTINGS_VALUES: u8 = 0x87;
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pub const ID_LOAD_DEFAULT_SETTINGS: u8 = 0x8E;
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pub const ID_GET_DEVICE_INFO: u8 = 0xA1;
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pub const ID_GET_STRING_ATTRIBUTE: u8 = 0xAE;
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pub const ATTRIB_STR_UNIT_SERIAL: u8 = 0x01;
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/// Input report message types: SC = `ID_CONTROLLER_STATE`, Deck = `ID_CONTROLLER_DECK_STATE`.
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pub const ID_CONTROLLER_STATE: u8 = 0x01;
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pub const ID_CONTROLLER_DECK_STATE: u8 = 0x09;
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/// Minimal vendor-defined HID report descriptor: one application collection with a 64-byte input
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/// report and a 64-byte feature report, both UNNUMBERED (report id 0). `hid-steam` is a raw-event
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/// driver (`steam_raw_event` consumes reports before HID field parsing), so the field layout is
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/// cosmetic — but `steam_probe` requires `hid_parse` to succeed AND a non-empty FEATURE report
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/// list (`steam_is_valve_interface`), so the feature item is mandatory.
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#[rustfmt::skip]
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pub const STEAMDECK_RDESC: &[u8] = &[
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0x06, 0x00, 0xFF, // Usage Page (Vendor-Defined 0xFF00)
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0x09, 0x01, // Usage (0x01)
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0xA1, 0x01, // Collection (Application)
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0x15, 0x00, // Logical Minimum (0)
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0x26, 0xFF, 0x00, // Logical Maximum (255)
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0x75, 0x08, // Report Size (8 bits)
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0x95, 0x40, // Report Count (64)
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0x09, 0x01, // Usage (0x01)
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0x81, 0x02, // Input (Data,Var,Abs) — the 64-byte state report
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0x09, 0x01, // Usage (0x01)
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0x95, 0x40, // Report Count (64)
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0xB1, 0x02, // Feature (Data,Var,Abs) — makes steam_is_valve_interface() true
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0xC0, // End Collection
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];
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// PROVISIONAL Deck button bits (from the v6.12 steam_do_deck_input_event listing) — NOT yet
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// on-box validated: the M0 spike's mash-probe confirmed the report PARSES (the full BTN_* set
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// fires), but byte 8 bit 7 alone did not produce BTN_A on the 7.0 box, so M1 must line-check the
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// real per-bit map against the lab kernel before these are trusted.
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/// `data[8]` bit 7 → (claimed) `BTN_A`.
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pub const DECK_B8_A: u8 = 0x80;
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/// `data[9]` bit 5 → (claimed) `BTN_MODE` (the Steam button).
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pub const DECK_B9_STEAM: u8 = 0x20;
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/// M0 controller state: just the five button bytes the Deck report packs (8, 9, 10, 13, 14). The
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/// sticks, triggers, trackpads and IMU stay neutral (signed-centred at 0) for the recognition
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/// spike; M1 fills them from the wire frame + rich-input planes.
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#[derive(Clone, Copy, Default)]
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pub struct SteamState {
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pub b8: u8,
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pub b9: u8,
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pub b10: u8,
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pub b13: u8,
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pub b14: u8,
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}
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impl SteamState {
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pub fn neutral() -> SteamState {
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SteamState::default()
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}
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/// Press/release `BTN_A` (the spike's toggle target).
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pub fn set_a(&mut self, down: bool) {
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if down {
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self.b8 |= DECK_B8_A;
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} else {
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self.b8 &= !DECK_B8_A;
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}
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}
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}
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/// Serialize a neutral-plus-buttons Deck state into the 64-byte unnumbered report. Header is
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/// `[0x01, 0x00, 0x09, len]` + a little-endian frame counter; `steam_raw_event` drops anything
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/// where `size != 64 || data[0] != 1 || data[1] != 0`, then switches on `data[2]`.
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pub fn serialize_deck_state(r: &mut [u8; STEAM_REPORT_LEN], st: &SteamState, seq: u32) {
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r.fill(0);
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r[0] = 0x01;
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r[1] = 0x00;
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r[2] = ID_CONTROLLER_DECK_STATE;
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r[3] = 0x3C; // payload length; the kernel ignores it
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r[4..8].copy_from_slice(&seq.to_le_bytes());
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r[8] = st.b8;
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r[9] = st.b9;
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r[10] = st.b10;
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r[13] = st.b13;
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r[14] = st.b14;
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}
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/// Build the `steam_get_serial` GET_REPORT reply: `[0xAE, len, ATTRIB_STR_UNIT_SERIAL, ascii…]`,
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/// padded to 64 bytes. The kernel validates `reply[0] == 0xAE && 1 <= reply[1] <= 21 &&
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/// reply[2] == 1`; the serial ASCII follows at byte 3.
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pub fn serial_reply(serial: &str) -> [u8; STEAM_REPORT_LEN] {
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let mut buf = [0u8; STEAM_REPORT_LEN];
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let bytes = serial.as_bytes();
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let len = bytes.len().clamp(1, 21);
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buf[0] = ID_GET_STRING_ATTRIBUTE;
|
||||
buf[1] = len as u8;
|
||||
buf[2] = ATTRIB_STR_UNIT_SERIAL;
|
||||
buf[3..3 + len].copy_from_slice(&bytes[..len]);
|
||||
buf
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
use super::*;
|
||||
|
||||
/// `steam_is_valve_interface()` binds the device iff the descriptor declares ≥1 feature report,
|
||||
/// so the descriptor MUST contain a Feature main item (0xB1) — plus an Input item (0x81) for the
|
||||
/// state report. A regression here silently makes `hid-steam` treat the device as a
|
||||
/// keyboard/mouse boot interface and never create the gamepad.
|
||||
#[test]
|
||||
fn descriptor_declares_input_and_feature_reports() {
|
||||
assert!(
|
||||
STEAMDECK_RDESC.contains(&0xB1),
|
||||
"missing Feature main item — steam_is_valve_interface() would fail"
|
||||
);
|
||||
assert!(STEAMDECK_RDESC.contains(&0x81), "missing Input main item");
|
||||
assert_eq!(
|
||||
*STEAMDECK_RDESC.last().unwrap(),
|
||||
0xC0,
|
||||
"unterminated collection"
|
||||
);
|
||||
}
|
||||
|
||||
/// The report header is exactly what `steam_raw_event` requires (`data[0]==1, data[1]==0,
|
||||
/// data[2]==0x09`), the frame counter is little-endian, and `set_a` toggles byte 8 bit 7.
|
||||
#[test]
|
||||
fn serialize_header_seq_and_button() {
|
||||
let mut st = SteamState::neutral();
|
||||
st.set_a(true);
|
||||
let mut r = [0u8; STEAM_REPORT_LEN];
|
||||
serialize_deck_state(&mut r, &st, 0xAABB_CCDD);
|
||||
assert_eq!(&r[0..4], &[0x01, 0x00, 0x09, 0x3C]);
|
||||
assert_eq!(&r[4..8], &[0xDD, 0xCC, 0xBB, 0xAA]); // seq LE
|
||||
assert_eq!(r[8] & DECK_B8_A, DECK_B8_A);
|
||||
st.set_a(false);
|
||||
serialize_deck_state(&mut r, &st, 0);
|
||||
assert_eq!(r[8] & DECK_B8_A, 0);
|
||||
}
|
||||
|
||||
/// The serial reply passes `steam_get_serial`'s validation (`reply[0]==0xAE`, `1<=reply[1]<=21`,
|
||||
/// `reply[2]==1`) and carries the ASCII at byte 3.
|
||||
#[test]
|
||||
fn serial_reply_passes_kernel_validation() {
|
||||
let r = serial_reply("PUNKTFUNK01");
|
||||
assert_eq!(r[0], ID_GET_STRING_ATTRIBUTE);
|
||||
assert!((1..=21).contains(&r[1]));
|
||||
assert_eq!(r[2], ATTRIB_STR_UNIT_SERIAL);
|
||||
assert_eq!(&r[3..3 + r[1] as usize], b"PUNKTFUNK01");
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user