getting /dev entries for USB devices

getting /dev entries for USB devices

[Stephen Morgan]

Hello all,

I'm trying to get udev to create nodes for my USB devices.  There will be
several of the same device and I need their nodes named according to their
bus location.

I created this rule file in /etc/udev/rules.d, called it 05-aa_dev.rules

BUS="usb", PLACE="1.1", NAME="aa_dev01"
BUS="usb", PLACE="1.2", NAME="aa_dev02"
BUS="usb", PLACE="2.1", NAME="aa_dev03"
BUS="usb", PLACE="2.2", NAME="aa_dev04"
BUS="usb", PLACE="3.1", NAME="aa_dev05"
BUS="usb", PLACE="3.2", NAME="aa_dev06"
BUS="usb", PLACE="4.1", NAME="aa_dev07"
BUS="usb", PLACE="4.2", NAME="aa_dev08"

When I plug the devices in, I see a new entry show up in
/sys/bus/usb/devices, for instance "3-1". In that directory, I can find the
idProduct and idVendor that match my device - so far, so good.

But nothing ever shows up in /dev.  I should see one of my device names
appear, shouldn't I?

I've read Daniel Drake's article on writing rules, but I'm sure I could be
missing something.

Thanks for your help.

Stephen Morgan



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RE: getting /dev entries for USB devices

[Stephen Morgan]

> -----Original Message-----
> From: Stephen Morgan [mailto:stephenm@glw.com]
> Sent: Friday, April 22, 2005 10:02 AM
> To: linux-hotplug-devel@lists.sourceforge.net
> Subject: getting /dev entries for USB devices
>
>
> Hello all,
>
> I'm trying to get udev to create nodes for my USB devices.  There
> will be several of the same device and I need their nodes named
> according to their bus location.
>
> I created this rule file in /etc/udev/rules.d, called it 05-aa_dev.rules
>
> BUS="usb", PLACE="1.1", NAME="aa_dev01"
> BUS="usb", PLACE="1.2", NAME="aa_dev02"
> BUS="usb", PLACE="2.1", NAME="aa_dev03"
> BUS="usb", PLACE="2.2", NAME="aa_dev04"
> BUS="usb", PLACE="3.1", NAME="aa_dev05"
> BUS="usb", PLACE="3.2", NAME="aa_dev06"
> BUS="usb", PLACE="4.1", NAME="aa_dev07"
> BUS="usb", PLACE="4.2", NAME="aa_dev08"
>
> When I plug the devices in, I see a new entry show up in
> /sys/bus/usb/devices, for instance "3-1". In that directory, I
> can find the idProduct and idVendor that match my device - so
> far, so good.
>
> But nothing ever shows up in /dev.  I should see one of my device
> names appear, shouldn't I?
>
> I've read Daniel Drake's article on writing rules, but I'm sure I
> could be missing something.
>
> Thanks for your help.
>
> Stephen Morgan
>

Is there a simple way to tell if the .rules file is being applied, I mean,
other than the nodes appearing in /dev?  I've tried intentionally putting
typos in my file and in 50-udev.rules, but couldn't see that it affected
anything.

I don't see a lot of use of PLACE in .rules files, is it working okay?

running Fedora Core 3 (Linux 2.6.9-1.667, which uses udev version 039)



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RE: getting /dev entries for USB devices

[Kay Sievers]

On Wed, 2005-04-27 at 11:18 -0500, Stephen Morgan wrote:
> > I'm trying to get udev to create nodes for my USB devices.  There
> > will be several of the same device and I need their nodes named
> > according to their bus location.
> >
> > I created this rule file in /etc/udev/rules.d, called it 05-aa_dev.rules
> >
> > BUS="usb", PLACE="1.1", NAME="aa_dev01"
> > BUS="usb", PLACE="1.2", NAME="aa_dev02"
> > BUS="usb", PLACE="2.1", NAME="aa_dev03"
> > BUS="usb", PLACE="2.2", NAME="aa_dev04"
> > BUS="usb", PLACE="3.1", NAME="aa_dev05"
> > BUS="usb", PLACE="3.2", NAME="aa_dev06"
> > BUS="usb", PLACE="4.1", NAME="aa_dev07"
> > BUS="usb", PLACE="4.2", NAME="aa_dev08"
> >
> > When I plug the devices in, I see a new entry show up in
> > /sys/bus/usb/devices, for instance "3-1". In that directory, I
> > can find the idProduct and idVendor that match my device - so
> > far, so good.
> >
> > But nothing ever shows up in /dev.  I should see one of my device
> > names appear, shouldn't I?

It depends. Not all devices have device nodes. Some USB devices, like
scanners, are only accessed through usbfs with a userspaces driver.

> Is there a simple way to tell if the .rules file is being applied, I mean,
> other than the nodes appearing in /dev?  I've tried intentionally putting
> typos in my file and in 50-udev.rules, but couldn't see that it affected
> anything.

You may run udevtest, with the DEVPATH of this device.

> I don't see a lot of use of PLACE in .rules files, is it working okay?

PLACE is not used anymore and removed from future udev versions. ID
works the same way.

Kay



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RE: getting /dev entries for USB devices

[Stephen Morgan]

> Kay Sievers wrote:
> On Wed, 2005-04-27 at 11:18 -0500, Stephen Morgan wrote:
> > > I'm trying to get udev to create nodes for my USB devices.  There
> > > will be several of the same device and I need their nodes named
> > > according to their bus location.
> > >
> > > I created this rule file in /etc/udev/rules.d, called it
> 05-aa_dev.rules
> > >
> > > BUS="usb", PLACE="1.1", NAME="aa_dev01"
> > > BUS="usb", PLACE="1.2", NAME="aa_dev02"
> > > BUS="usb", PLACE="2.1", NAME="aa_dev03"
> > > BUS="usb", PLACE="2.2", NAME="aa_dev04"
> > > BUS="usb", PLACE="3.1", NAME="aa_dev05"
> > > BUS="usb", PLACE="3.2", NAME="aa_dev06"
> > > BUS="usb", PLACE="4.1", NAME="aa_dev07"
> > > BUS="usb", PLACE="4.2", NAME="aa_dev08"
> > >
> > > When I plug the devices in, I see a new entry show up in
> > > /sys/bus/usb/devices, for instance "3-1". In that directory, I
> > > can find the idProduct and idVendor that match my device - so
> > > far, so good.
> > >
> > > But nothing ever shows up in /dev.  I should see one of my device
> > > names appear, shouldn't I?
>
> It depends. Not all devices have device nodes. Some USB devices, like
> scanners, are only accessed through usbfs with a userspaces driver.
>
> > Is there a simple way to tell if the .rules file is being
> applied, I mean,
> > other than the nodes appearing in /dev?  I've tried
> intentionally putting
> > typos in my file and in 50-udev.rules, but couldn't see that it affected
> > anything.
>
> You may run udevtest, with the DEVPATH of this device.
>
> > I don't see a lot of use of PLACE in .rules files, is it working okay?
>
> PLACE is not used anymore and removed from future udev versions. ID
> works the same way.
>
> Kay
>

Hi Kay,

Thanks very much for your help - it led me directly to the answer.  I'm in
the process of converting my 2.4 driver to run under 2.6 and apparently I
now have to create a device class in my driver before all the udev stuff
will work.

But, after I added the class definition to my driver, I still wasn't getting
the nodes.  Running udevtest as you suggested showed my what was going
wrong.

Both udev.rules.examples and man udev show examples of using PLACE like
this:

  BUS="usb", PLACE="1.3", NAME="mouse0"

and that's the format I used in my .rules file.  But in order to match, that
string should instead be:

  BUS="usb", PLACE="1-3", NAME="mouse0"

dashes, not dots.  I changed all the "." to "-" in my .rules and my nodes
suddenly appeared!

Thanks again for you help,

Stephen



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