poll function implementation

I am stuck on implementing the poll method in the kernel code. how to set up the poll file operation for the parport device driver. I set up the irq function and hook_poll like this:

irq_function(struct pp_adc *p)
{
p->irq_counter++;
wake_up(p->wait_queue);
}
hook_poll(filp, wait)
{
mask = POLLIN | POLLNORMRD;
struct pp_adc *p = filp->private data;
poll_wait(filp, &p->wait_queue, wait);
if (irq_counter > 0)
{
mask |= POLLBAND;
}
return mask;
}
I tried the poll method with various timeout values but the function always returns in 3-4 seconds saying that it detected traffic (input) on the pins even though the device is off. So I don't think I am doing it correctly. I could technically get this function to work by simply telling it to watch the ACK and return the mask value when detected. Is there a more refined method I could use? please help