> #define TIOCSFIFORTRIG _IOW('T', 0x41, unsigned char)
>
> > Also, why pass a pointer to a variable, and not just the value itself?
>
> Ah, it's no big reason.
> It will pass just the value itself in V2.
We don't need ioctls here - we have a sysfs interface we can expand to do
this. We also need proper locking. This isn't a trivial change but its
perfectly doable given a real world use case.
> According to a manual of setserial command, we could set RX interrupt
> trigger only for the Hayes ESP serial driver. However, current kernel
> does not support Hayes ESP serial[1]. I couldn't find this feature for
> current 8250/16X50 drivers.
It is long gone and was a set of ugly device specific hacks.
Alan
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