Re: best way to handle LEDs

[Pavel Machek]

Hi!

> > Except the led code that is being proposed CAN sit on top of a generic
> > GPIO layer.
> 
> I also have issues with a generic GPIO layer.  As I mentioned in the
> past, there's serious locking issues with any generic abstraction of
> GPIOs.
> 
> 1. You want to be able to change GPIO state from interrupts.  This
>    implies you can not sleep in GPIO state changing functions.
> 
> 2. Some GPIOs are implemented on I2C devices.  This means that to
>    change state, you must sleep.

Can't you just busywait? Yes, it is ugly in general, but perhaps it
is better than alternatives...


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