Getting notification of PS/2 mouse packages

[Michael Thayer <michael.thayer@oracle.com>]

Hello,

I am looking at writing a driver (it is to be open source, but not for
mainstream kernel inclusion) for a virtual machine-specific input
device.  Unfortunately one of the versions of the device I have to
support signals that it has new data available by sending a fake package
to the PS/2 mouse, so I need to be able to get notification of that
somehow.  Looking at the kernel source, I see that the i8042 driver
requests IRQ 12 as IRQF_SHARED, and that the kernel always notifies all
registered interrupt handlers of an interrupt, even if one of them
returns IRQ_HANDLED.  So it looks like I can just request my own shared
handler for IRQ 12 and always return IRQ_NONE, but still update my data.
However I am not sure whether this is something I can count on to keep
working in future kernel releases.  Does anyone on this list know more
about this, or can someone suggest a cleaner way to get the
notifications I need?

Thanks.

Regards,

Michael
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