Hi!
Currently I'm writing a char-driver for a serial multiportcard within
my degree dissertation. The only thing that doesn´t work is the
poll-routine. I have no idea what´s going wrong, I hope anyone can
help me.
The Problem is that the kernel never executes my poll-routine. This
routine is registered in the struct file_operations in my driver. The
poll-Routine looks like this:
static unsigned int addi_poll(struct file *filp, poll_table *wait)
{
unsigned int mask = 0;
addi_module *module_info;
module_info = (addi_module *) filp->private_data;
printk(KERN_INFO "Select\n");
/*module_info->readq is the waitqueue*/
poll_wait(filp, &module_info->readq, wait);
mask |= (POLLIN | POLLRDNORM);
return(mask);
}
Every time data is available my isr runs the following codeline:
wake_up_interruptible(&module_info->readq);
The source of my application contains the following lines:
...
int handle;
fd_set sel;
handle = open("/dev/ttySA0", O_RDWR | O_NONBLOCK);
if(handle < 0)
{
printf("Can`t find device\n");
return(1);
}
FD_ZERO(&sel);
FD_SET(handle, &sel);
ret = select(1, &sel, NULL, NULL, NULL);
...
When I´m running the application it will never leave the select,
although data is incoming and wake_up_interruptible executes. Also the
output of printk is never printed out, so it seems that my routine is
never entered.
Can anybody tell me what´s going wrong with that? For any hints I
would be very thankful.
Best regards
Thorsten Kruse
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