[argyllcms] Re: Running dispcal stops usb card reader
- From: Graeme Gill <graeme@xxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Thu, 16 Feb 2012 15:03:30 +1100
Ridouan Agarad wrote:
> The script-approach (dmesg | grep ttyS) reported the correct number of ports
> available, on both
> machines. Problem with this is that if someone did 'dmesg -c' it wouldn't
> work anymore, not really
> that elegant (aside from using a script-approach in a compiled program).
Pretty horrid for an application - fine for a quick and dirty user look.
> Another quick way might be to access this information directly via the file
> system. It appears that
> that for e.g. ttyS0 the information can be found in /sys/class/tty/ttyS0/*,
> where the symlink
> 'driver' points to the driver for that port (either serial or serial8250 in
> my case). The
> directories for the specific port contains all kinds of info (e.g. a
> "resources" file with the
> allocated system resources).
Hmm. As far as I can see, this still doesn't distinguish between real and place
holder
serial ports though.
This is in contrast to "setserial -gb /dev/ttyS*" which does work,
but does so by opening the serial port.
I'm wondering if the problem you see is due to Argyll opening /dev/ttyUSB*
though.
It's easy enough to skip looking at those ports, since they only turn up
when they are present.
Graeme Gill.
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