Re: i8042 problem

[Vojtech Pavlik]

On Tue, Jul 29, 2003 at 08:29:01PM +0200, Maciej W. Rozycki wrote:
 
>  Nice joke, but I'll answer seriously.  No support was provided.  Hooking
> a PC/XT keyboard to the 8042, if supported, requires a different setup of
> the command byte and is possibly done by the system firmware.  You can
> read the command byte to see which configuration is used.
> 
>  Wrt polling vs IRQ-driven probing and setup: using IRQ is a natural
> choice as you have to do keyboard detection in the IRQ handler anyway to
> properly support hot plugging of a PC/AT or a PS/2 keyboard. 

The only problem there is that it results in a damn complex state
machine. Look at the PS/2 mouse probing and imagine how the state
machine would look.

-- 
Vojtech Pavlik
SuSE Labs, SuSE CR
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