Date: Sat, 10 Feb 2001 22:19:49 -0800 (PST) From: Matt Dillon <dillon@earth.backplane.com> To: Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp> Cc: Warner Losh <imp@harmony.village.org>, Jesper Skriver <jesper@skriver.dk>, Robert <robert@chalmers.com.au>, freebsd-stable@FreeBSD.ORG, yokota@zodiac.mech.utsunomiya-u.ac.jp Subject: Re: uh oh - after 4 -> 4.2 cvsup, no keyboard. any ideas? Message-ID: <200102110619.f1B6Jn830124@earth.backplane.com> References: <20010204112503.E71706@skriver.dk> <EJEPLCEELLLLAMPNEJMHIECHCLAA.robert@chalmers.com.au> <200102110424.f1B4OVW18984@harmony.village.org> <200102110446.f1B4ksR29654@earth.backplane.com> <200102110525.OAA06084@zodiac.mech.utsunomiya-u.ac.jp> <200102110549.f1B5n8A29927@earth.backplane.com> <200102110616.PAA07027@zodiac.mech.utsunomiya-u.ac.jp>
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:The flags 0x1 was added to the AT keyboard driver when the USB
:support was added to GENERIC by default in -CURRENT (GENERIC
:rev 1.255) and in -STABLE (GENERIC rev 1.246.2.5). (I don't recall
:many complaints at that time...)
:
:We need to develop consensus on this.
:
:Kazu
What if we simply created an API to overload the syscons input device?
That is, allow any device driver to install a syscons input device. The
most recent device driver to do so is the one that gets called. If it
deinstalls itself, prior device drivers take back over. We wouldn't
worry about allowing input from two sources at the same time... one would
simply override the other with the other going into the bit bucket.
It looks like it would be fairly easy to do in the code. It would be
a small, simple structure managed in a linked list.
Then *all* keyboard device drivers would be allowed to probe independantly
from each other. We simply probe the AT keyboard device first. It will
nominally succeed. Then later on we probe the USB keyboard and if it
exists it simply overloads the AT device (AT key strokes start going into
the bit bucket). If the USB keyboard is removed, it removes its
overloading and the AT keyboard works again.
-Matt
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