Problems defining an udev rule for usb-daq board

Problems defining an udev rule for usb-daq board

[a0123195]

Hi all,
I've got trouble configuring an usb-daq board with udev. I use a 
recent self-compiled kernel (2.6.16-2-686) on Debian testing with 
comedi-0.7.72 and an usb-daq board (usbdux). The daq-board runs 
perfect, but I can't figure out how it can be automagically configured 
by udev when hotplugged. After connecting the board,  one had to 
execute the following command (as root): 

/usr/local/sbin/comedi_config -i /usr/local/share/usb/usbdux_firmware.
hex /dev/comedi0 usbdux

I tried the following udev-rule without success:

KERNEL="usbdux", SUSBSYSTEM="module",  SYSFS{refcnt}="0", RUN+="
/usr/local/bin/config_usbdux"

where "config_usbdux" is a shell-script with the comedi_config command 
above.

The following output might be helpful:

# udevinfo -a -p /sys/module/usbdux/

[...]

  looking at device '/module/usbdux':
    KERNEL="usbdux"
    SUBSYSTEM="module"
    SYSFS{refcnt}="0"

# udevinfo -a -p /sys/bus/usb/drivers/usbdux/

  looking at device '/bus/usb/drivers/usbdux':
    KERNEL="usbdux"
    SUBSYSTEM="drivers"

After connecting the daq-board, dmesg shows:

usb 5-1: new high speed USB device using ehci_hcd and address 34
usb 5-1: configuration #1 chosen from 1 choice
comedi_: usbdux_: finding a free structure for the usb-device
comedi_: usbdux: usbduxsub[0] is ready to connect to comedi.
comedi_: usbdux: ifnum=0
comedi_: usbdux0 has been successfully initialised.

After configuring with comedi_config dmesg shows

comedi0: usbdux: uploading 1471 bytes to addr 0, first byte=2.
comedi0: usbdux: usb-device 0 is attached to comedi.
comedi0: attached to usbdux.

Now the board is ready to use,. Any ideas? Thanks in advance, Sven








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Re: Problems defining an udev rule for usb-daq board

[Kay Sievers]

On Fri, 2006-08-18 at 12:59 +0200, a0123195@tiscali.de wrote:
> Hi all,
> I've got trouble configuring an usb-daq board with udev. I use a 
> recent self-compiled kernel (2.6.16-2-686) on Debian testing with 
> comedi-0.7.72 and an usb-daq board (usbdux). The daq-board runs 
> perfect, but I can't figure out how it can be automagically configured 
> by udev when hotplugged. After connecting the board,  one had to 
> execute the following command (as root): 
> 
> /usr/local/sbin/comedi_config -i /usr/local/share/usb/usbdux_firmware.
> hex /dev/comedi0 usbdux
> 
> I tried the following udev-rule without success:
> 
> KERNEL="usbdux", SUSBSYSTEM="module",  SYSFS{refcnt}="0", RUN+="
> /usr/local/bin/config_usbdux"

You plug into the module-load event. Are you sure that the module isn't
already loaded when you connect the device? And how will the module-load
event, that calls your script, find the the device?

Why don't you plug into the event for the device to upload the firmware?

Kay


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AW: Re: Problems defining an udev rule for usb-daq board

[a0123195]

>You plug into the module-load event. Are you sure that the module 
isn't
>already loaded when you connect the device? And how will the module-
load
>event, that calls your script, find the the device?

The module usbdux is automatically loaded when the device is
connetcted.

>Why don't you plug into the event for the device to upload the 
firmware?

How? I don't know much about udev, but it worked with kernel 2.6.8.
and the hotplug scripts.

Thanks, Sven
>
>Kay
>
>









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Re: AW: Re: Problems defining an udev rule for usb-daq board

[Kay Sievers]

On Fri, 2006-08-18 at 14:20 +0200, a0123195@tiscali.de wrote:
> >You plug into the module-load event. Are you sure that the module 
> isn't
> >already loaded when you connect the device? And how will the module-
> load
> >event, that calls your script, find the the device?
> 
> The module usbdux is automatically loaded when the device is
> connetcted.

But only the first time you connect a matching device and never again,
except you unload it manually.

> >Why don't you plug into the event for the device to upload the 
> firmware?
> 
> How? I don't know much about udev, but it worked with kernel 2.6.8.
> and the hotplug scripts.

Run 'udevmonitor --env', plug-in the device, pick from the list of
events the one for the device and use this.

Try the one which contains the correct DEVNAME and use that value as the
device node name you upload the firmware to.

Good luck,
Kay


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Re: Problems defining an udev rule for usb-daq board

[Greg KH]

On Fri, Aug 18, 2006 at 12:59:34PM +0200, a0123195@tiscali.de wrote:
> Hi all,
> I've got trouble configuring an usb-daq board with udev. I use a 
> recent self-compiled kernel (2.6.16-2-686) on Debian testing with 
> comedi-0.7.72 and an usb-daq board (usbdux). The daq-board runs 
> perfect, but I can't figure out how it can be automagically configured 
> by udev when hotplugged. After connecting the board,  one had to 
> execute the following command (as root): 

Hm, do you have a pointer to where you got the usbdux code from?  It's
not in the main kernel tree, right?

thanks,

greg k-h

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AW: Re: Problems defining an udev rule for usb-daq board

[a0123195]

The usbdux code is part of comedi, see e.g. http://www.comedi.
org/download/comedilib-0.7.22.tar.gz, more information about the daq 
board is here: http://www.linux-usb-daq.co.uk/.

Thanks, Sven

>----Ursprüngliche Nachricht----
>Von: greg@kroah.com
>Datum: 19.08.2006 04:59
>An: <a0123195@tiscali.de>
>Cc: <linux-hotplug-devel@lists.sourceforge.net>
>Betreff: Re: Problems defining an udev rule for usb-daq board
>
>On Fri, Aug 18, 2006 at 12:59:34PM +0200, a0123195@tiscali.de wrote:
>> Hi all,
>> I've got trouble configuring an usb-daq board with udev. I use a 
>> recent self-compiled kernel (2.6.16-2-686) on Debian testing with 
>> comedi-0.7.72 and an usb-daq board (usbdux). The daq-board runs 
>> perfect, but I can't figure out how it can be automagically 
configured 
>> by udev when hotplugged. After connecting the board,  one had to 
>> execute the following command (as root): 
>
>Hm, do you have a pointer to where you got the usbdux code from?  
It's
>not in the main kernel tree, right?
>
>thanks,
>
>greg k-h
>









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Re: Re: Problems defining an udev rule for usb-daq board

[Greg KH]

On Mon, Aug 21, 2006 at 04:55:33PM +0200, a0123195@tiscali.de wrote:
> The usbdux code is part of comedi, see e.g. http://www.comedi.
> org/download/comedilib-0.7.22.tar.gz, more information about the daq 
> board is here: http://www.linux-usb-daq.co.uk/.

Ah, ok, that fun thing :(

Try asking the authors of that code to fix it up, as it is not under the
GPL, I'm not allowed to touch it, sorry.

good luck,

greg k-h

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