Re: User mode drivers: part 1, interrupt handling (patch for2.6.11)

From: Alan Cox
Date: Tue Mar 15 2005 - 08:35:12 EST

On Maw, 2005-03-15 at 04:32, Lee Revell wrote:
> This seems sufficient for the simplest devices, that just have an
> IRQ_PENDING and an IRQ_ACK register. But what about a device like the
> emu10k1 where you have a half loop and loop interrupt for each of 64
> channels, plus about 10 other interrupt sources? The IPR just tells you
> there's a channel loop interrupt pending, in order to properly ACK it
> you need to set a bit in one of 4 registers depending on whether it's a
> loop or half loop interrupt, and whether the channel is 0-31 or 32-64.

Do we need to solve it for all such devices in one go and can we write
custom code for the hard cases. Peter solved the simple unshared-IRQ
case. I'd like to solve the simple shared IRQ cases too (because X can
use this).

I'm wondering where the right line is ?

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