enricobuehler
8870e85233
The interface-2 wall is climbed. packaging/linux/steam-deck-gadget/deck_raw_gadget.c is a raw_gadget userspace emulator of a real 3-interface USB Steam Deck (28DE:1205, mouse=0/keyboard=1/controller=2) on a dummy_hcd loopback UDC, with descriptors captured verbatim from a physical Deck and full HID feature-report handling. Live on a real Deck (SteamOS 3.8.11): hid-steam reads our serial (PFDECK000), creates the Steam Deck + Motion Sensors evdevs, and Steam Input PROMOTES it — controller.txt "Interface: 2 ... device opened ... reserving XInput slot 1" + "input: Microsoft X-Box 360 pad 1". Stable (1 connect, 0 disconnects, no zombie); the kernel Steam Deck evdev is then grabbed by Steam Input which exposes its own X-Box pad, exactly like a real Deck. First time a virtual Deck is fully Steam-Input promoted (UHID can't — it has no USB interface number, so Steam filters it). Also includes the configfs f_hid variant (configfs_gadget_up/down.sh) — the minimal reproducer that proved interface 2 makes Steam open+XInput-reserve the device, but f_hid can't serve feature reports so Steam dropped it as a zombie. Gotchas documented in the README: 7-byte vs 9-byte endpoint descriptor, no-data OUT controls acked via zero-length EP0_READ (not WRITE, else error -110), streamer must not start before SET_CONFIGURATION is acked. SteamOS-host only (needs dummy_hcd + raw_gadget). Recognition proven; feeding real client reports + a host backend is next. Not pushed. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
13 lines
571 B
Bash
13 lines
571 B
Bash
#!/bin/bash
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# Tear down the PoC virtual Deck gadget.
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G=/sys/kernel/config/usb_gadget/pfdeck
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[ -d "$G" ] || { echo "no gadget"; exit 0; }
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echo "" > "$G/UDC" 2>/dev/null || true
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for l in "$G"/configs/c.1/hid.usb*; do [ -e "$l" ] && rm -f "$l"; done
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rmdir "$G"/configs/c.1/strings/0x409 2>/dev/null || true
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rmdir "$G"/configs/c.1 2>/dev/null || true
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rmdir "$G"/functions/hid.usb* 2>/dev/null || true
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rmdir "$G"/strings/0x409 2>/dev/null || true
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rmdir "$G" 2>/dev/null || true
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echo "gadget torn down ($(ls /sys/kernel/config/usb_gadget/ 2>/dev/null | wc -l) gadgets remain)"
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