Problem accessing IR port - Ubuntu 8.10

[wizche]

Hi,

I'm currently trying to develop a IR Remote (TV consumer) listener in C under Linux.

First of all I tried with an old notebook with an integrated IR peripheral (FIR)under Debian (kernel 2.6). All seems to work fine, I can also access directly with
#cat /dev/ttyS1
And my listener (written in C) work pretty fine.

Problems came up with a newer notebook with Ubuntu 8.10.
I set FIR in Bios like the older notebook. But trying to access with cat /dev/ttyS1 raise this error: read: Input/output error
I took immediatly that something lock this device but, how can I see which process lock this resource?

Running my program (a simple non canonical read from the /dev/ttyS1) give me NO data... Seems to be that nothing is coming through the IR port (despite I was trying clicking about an hundred buttons on 3 differents remote controllers :) ).
I tried to unload all modules of irda and I disable UART setting with setserial, but nothing change.

I'm pretty sure that problem came because of "something" who lock this device, but I have no idea how to patch it.

Any suggestions?

Thanks a lot

Sergio

[Nepomuk]

First thing I'd check is: Is /dev/ttyS1 really the correct device? Maybe this Laptop is wired slightly different than the Debian machine. I just checked on my machine (currently Xubuntu 8.04, going to install 8.10 soon) and I have ttyS0 - ttyS3. I don't know which of them is my IR device, but one of them will be. (I'm sure you can check that somehow, but don't know how to right now.)

Greetings,
Nepomuk

[wizche]

Hi nepomoku!
Thanks for reply...

I'm sure that /dev/ttyS1 is the correct device...
I checked the address and IRQ in the BIOS and is the exactly the same of the result from setserial /dev/ttyS1 and from dmesg ¦ grep tty

You've tried to make a simple cat to your ir device? It works?