Re: Possible to software trigger an interrupt?

[Jonathan Cameron <jic23@cam.ac.uk>]

On 04/03/11 17:04, Jonathan Cameron wrote:
> Hi,
> 
> Having produced a proof of concept for using gpio chips
> to handle the triggers in IIO I am looking at converting
> over our sysfs trigger.  This trigger is used to initialize
> capture on devices in a similar way to dataready interrupts.
> The key point is we want to handle this in the same way within
> drivers as the hardware event triggers. 
> 
> It is a very useful tool.  So the upshot is, what is the best
> way to handle causing an interrupt to occur from userspace?
> 
> Any pointers on how to do this would be most welcome.

For what it is worth, the incredibly dumb approach of just
calling handle_nested_irq seems to 'work'.   I dread to think
what that might be quietly breaking though...

My understanding of some of this code is still rather limited
I'm afraid!

Jonathan