The two things this driver's README has always listed as the missing WGI/GameInput work,
both user-mode, neither needing a bus driver:
`IOCTL_XUSB_WAIT_FOR_INPUT` is now pended on a manual queue and completed by the periodic
timer on a dwPacketNumber edge, answering with the same 29-byte GET_STATE payload the
synchronous path serves. Declining it was enough for classic xinput1_4, which just falls
back to sync GET_STATE polling — that is why the pad has always worked there. It is not
enough for WGI/GameInput, which poll asynchronously: to them a decline is a refusal, not
a fallback. Completion is edge-gated because releasing a waiter on an unchanged packet
spins its caller at timer rate. WAIT_GUIDE_BUTTON stays declined — we have no state to
signal on.
The INF adds UpperFilters=xinputhid on the XUSB devnode. Note the earlier attempt put
that filter on the HID child of the *other* backend, which was simply the wrong devnode:
XInput does not read HID at all, it enumerates GUID_DEVINTERFACE_XUSB, which is what this
driver registers.
Verified on .173: build + sign + catalog exit 0; infverif "INF is VALID"; the devnode
starts Status OK with UpperFilters=xinputhid readable back from its enum key; and XInput
still sees the pad (slot 1 live alongside the box's real Elite in slot 0), so the async
queue is no regression to the path that already worked.
NOT yet measured: whether WGI/GameInput now admit the pad. `IG_` is the wrong probe for
this driver — it is a HID-path artifact and pf-xusb is System-class with no HID child, so
its absence says nothing either way. That needs a real WinRT/GameInput enumeration test.
enricobuehler
d2a2bcc25d