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Subject: Re: Interrupt handler registration for multiple devices
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Rick Brown <rick.brown.3@gmail.com>
Cc: linux-newbie@vger.kernel.org, kernelnewbies@nl.linux.org,
       linux-kernel@vger.kernel.org
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Date: Wed, 30 Aug 2006 20:38:35 +0100
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Ar Mer, 2006-08-30 am 20:42 +0530, ysgrifennodd Rick Brown:
> Hi,
> 
> I want to write a driver that will handle multiple devices. These
> devices will share the IRQ line. Do I need to register my (same)
> interrupt handler as many times as the number of devices(by calling
> request_irq())?

Up to you. If you are working with standard devices that need no special
handling to share interrupts (eg PCI bus), the device model makes it
more natural to do that and let the kernel call your handler once for
each device (passing a different dev_id).