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From: Dan Streetman <>
To: Vojtech Pavlik <>, Alan Cox <>
Cc: Linux Kernel <>
Subject: Re: ps2 keyboard filter hook
Date: Fri, 15 Jun 2001 17:30:03 -0400 (EDT)	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

>X11 likes to talk direct to the PS/2 port.  I actually think you should
>talk to Vojtech for the mainstream kernel about the input device work. It
>sounds much cleaner and more close to what you need

Ah, I didn't realize the input layer was handling PS/2 stuff...?  Although I am
not sure it would work; the special needs of these keyboards requires the driver
to do some bizarre things, such as:

- change scancodes.  I was and still am shocked by this.  I will say that it is
  a 'legacy feature' that I'm told is due having to deal with Windoze...
- consume scancodes.  The keyboard uses normal scancodes for the extra hardware
  as well as normal keys, so if the driver can't filter them out large amounts
  of strange characters will appear when (e.g.) a credit card is swiped.
- send large amounts of bytes (multi-KB) to the PS/2 port (I think this
  may be possible).

The filtering needs to be done fairly early (I think), or the keyboard state may
get corrupted by seemingly random 'normal' scancodes coming in (for non-raw

Vojtech, could you comment on if the above is possible using the input layer?

Dan Streetman
186,282 miles per second:
It isn't just a good idea, it's the law!

       reply	other threads:[~2001-06-15 21:35 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <>
2001-06-15 21:30 ` Dan Streetman [this message]
2001-06-15 21:44   ` Vojtech Pavlik
2001-06-28 15:40 Dan Streetman
  -- strict thread matches above, loose matches on Subject: below --
2001-06-18 16:42 Dan Streetman
2001-06-16 16:00 Andries.Brouwer
2001-06-16 12:53 Andries.Brouwer
2001-06-16 13:38 ` Christoph Hellwig
     [not found] <>
2001-06-15 22:14 ` Dan Streetman
2001-06-15 22:21   ` Vojtech Pavlik
     [not found] <>
2001-06-15 21:03 ` Dan Streetman
2001-06-16  4:50   ` Mike A. Harris
2001-06-15 20:03 ddstreet
2001-06-15 20:24 ` Jeff Garzik
2001-06-15 20:35 ` Alan Cox
2001-06-16 14:13 ` Michael Rothwell

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