interface for a hardware trigger driver

[Andre Haupt]

Hi folks,

Its been a while since i last did some kernel related stuff,
so please bear with me if this sounds strange to your ears.

What i want to achieve:
I want to implement a hardware trigger that a user space process
can react on.

I need a driver that blocks a process/thread until a sepcific
hardware interrupt occurs. The process should call a kernel
interface and then should get blocked until another
process/thread calls another kernel interface to stop waiting
for the irq or an interrupt actually occurs.

What i have:
Back in the days i wrote a little character driver which implemented
2 ioctl commands. One command (IOCTL_TRIGGER_WAIT_IRQ) put the
calling process to sleep using wait_evemt_interruptible() and
the other command (IOCTL_TRIGGER_STOP_WAIT_IRQ) woke a processes
again by calling wake_up_interruptible().

Now ioctls are frowned upon and i do not want to mess with
majors and minors anymore either.

Do you have any hints to the right approach for such a driver?
Should i use some sysfs interface? If yes, which? Or does
such a driver already exist? Can it be one completely in
user space?

puzzled.

cheers,

Andre