Re: Threaded interrupts for synaptic touchscreen in HTC dream

[David Brownell]

On Wednesday 22 July 2009, Thomas Gleixner wrote:
> 
> > Can that be cleaned up a bit, so that the handle_level_oneshot_irq()
> > and unmask_oneshot_irq() stuff kicks in automatically when needed,
> > instead of requiring board-specific (or driver-specific) code to get
> > that stuff right?
> 
> The only way I can see is to set a special trigger flag like
> IRQF_TRIGGER_RISING & Co. 
> 
> i.e. IRQF_TRIGGER_LEVEL | IRQF_TRIGGER_ONESHOT
> 
> That might work.

That direction, yes ... request_threaded_irq() can't infer ONESHOT
from IRQF_TRIGGER_{LOW,HIGH} since the hardirq handler might be
able to get Real Work (tm) done in some non-I2C/non-SPI cases.

Another alternative syntax:  magic cookies for the hardirq handler.
Example, pass NULL to get a default punt-to-irqthread behavior, with
ONESHOT set up if it sees IRQF_TRIGGER_HIGH or IRQF_TRIGGER_LOW.

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