* usblp attributes split in udevinfo
@ 2007-02-13 22:05 Arne Ahrend
2007-02-13 22:10 ` Kay Sievers
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: Arne Ahrend @ 2007-02-13 22:05 UTC (permalink / raw)
To: linux-hotplug
Hi,
lately the relevant attributes for my USB printer udev rule are split over two device
groups in udevinfo output (running udev-103):
looking at device '/class/usb/lp0':
KERNEL="lp0"
SUBSYSTEM="usb"
DRIVER=""
ATTR{dev}="180:0"
looking at parent device '/devices/pci0000:00/0000:00:10.1/usb2/2-2/2-2:1.0':
KERNELS="2-2:1.0"
SUBSYSTEMS="usb"
DRIVERS="usblp"
ATTRS{ieee1284_id}="MFG:Brother_CMD:PCL5,PJL,PCLXL_MDL:HL-1050 series_CLS:PRINTER_"
ATTRS{modalias}="usb:v04F9p0002d0100dc00dsc00dp00ic07isc01ip02"
ATTRS{bInterfaceProtocol}="02"
ATTRS{bInterfaceSubClass}="01"
ATTRS{bInterfaceClass}="07"
ATTRS{bNumEndpoints}="02"
ATTRS{bAlternateSetting}=" 0"
ATTRS{bInterfaceNumber}="00"
[....]
It is not clear to me if this intended (but it does make writing rules for persistent
printer symlinks much harder than it used to be around 2.6.12 or so), or something that
should be fixed in udev or the kernel (I am running 2.6.20 now).
In particular the DRIVER="" for /class/usb/lp0 seems awkward, should it not be usblp? The next group has
DRIVERS="usblp", but a device which is not suitable for printing. Using its ATTRS{modalias} for my udev printer rules
I get symlinks to device nodes like
crw-rw---- 1 root root 254, 14 2007-02-13 18:53 /dev/usbdev2.3_ep82
and not to /dev/usb/lp0.
Can anyone shed some light on this?
Cheers,
Arne
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: usblp attributes split in udevinfo
2007-02-13 22:05 usblp attributes split in udevinfo Arne Ahrend
@ 2007-02-13 22:10 ` Kay Sievers
2007-02-13 23:53 ` Arne Ahrend
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: Kay Sievers @ 2007-02-13 22:10 UTC (permalink / raw)
To: linux-hotplug
On 2/13/07, Arne Ahrend <aahrend@web.de> wrote:
> lately the relevant attributes for my USB printer udev rule are split over two device
> groups in udevinfo output (running udev-103):
>
> looking at device '/class/usb/lp0':
> KERNEL="lp0"
> SUBSYSTEM="usb"
> DRIVER=""
> ATTR{dev}="180:0"
>
> looking at parent device '/devices/pci0000:00/0000:00:10.1/usb2/2-2/2-2:1.0':
> KERNELS="2-2:1.0"
> SUBSYSTEMS="usb"
> DRIVERS="usblp"
> ATTRS{ieee1284_id}="MFG:Brother_CMD:PCL5,PJL,PCLXL_MDL:HL-1050 series_CLS:PRINTER_"
> ATTRS{modalias}="usb:v04F9p0002d0100dc00dsc00dp00ic07isc01ip02"
> ATTRS{bInterfaceProtocol}="02"
> ATTRS{bInterfaceSubClass}="01"
> ATTRS{bInterfaceClass}="07"
> ATTRS{bNumEndpoints}="02"
> ATTRS{bAlternateSetting}=" 0"
> ATTRS{bInterfaceNumber}="00"
>
> [....]
>
> It is not clear to me if this intended (but it does make writing rules for persistent
> printer symlinks much harder than it used to be around 2.6.12 or so), or something that
> should be fixed in udev or the kernel (I am running 2.6.20 now).
This all looks fine.
> In particular the DRIVER="" for /class/usb/lp0 seems awkward, should it not be usblp?
The lp0 device has no driver, that is correct.
The next group has
> DRIVERS="usblp", but a device which is not suitable for printing. Using its ATTRS{modalias} for my udev printer rules
> I get symlinks to device nodes like
> crw-rw---- 1 root root 254, 14 2007-02-13 18:53 /dev/usbdev2.3_ep82
> and not to /dev/usb/lp0.
>
> Can anyone shed some light on this?
What are you trying to do?
Kay
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: usblp attributes split in udevinfo
2007-02-13 22:05 usblp attributes split in udevinfo Arne Ahrend
2007-02-13 22:10 ` Kay Sievers
@ 2007-02-13 23:53 ` Arne Ahrend
2007-02-14 0:02 ` Matthias Schwarzott
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: Arne Ahrend @ 2007-02-13 23:53 UTC (permalink / raw)
To: linux-hotplug
On Tue, 13 Feb 2007 23:10:25 +0100
"Kay Sievers" <kay.sievers@vrfy.org> wrote:
> The next group has
> > DRIVERS="usblp", but a device which is not suitable for printing. Using its ATTRS{modalias} for my udev printer rules
> > I get symlinks to device nodes like
> > crw-rw---- 1 root root 254, 14 2007-02-13 18:53 /dev/usbdev2.3_ep82
> > and not to /dev/usb/lp0.
> >
> > Can anyone shed some light on this?
>
> What are you trying to do?
Thanks for replying. I am trying to create a persistent symlink (e.g. HL-1050) to the lp0 device.
The modalias or ieee1284_id attributes are in one group, but KERNEL="lp0" is in another.
So what is the best way to have a symlink /dev/HL-1050 -> /dev/usb/lp0 created automatically?
It used to be as easy as
SUBSYSTEM="usb", sysfs{modalias}="usb:v04F9p0002d0100dc00dsc00dp00ic07isc01ip02", SYMLINK="HL-1050"
but that now gives a link to device nodes like /dev/usbdev2.3_ep82 instead of /dev/usb/lp0.
Arne
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: usblp attributes split in udevinfo
2007-02-13 22:05 usblp attributes split in udevinfo Arne Ahrend
2007-02-13 22:10 ` Kay Sievers
2007-02-13 23:53 ` Arne Ahrend
@ 2007-02-14 0:02 ` Matthias Schwarzott
2007-02-14 7:18 ` Kay Sievers
2007-02-14 17:40 ` Arne Ahrend
4 siblings, 0 replies; 6+ messages in thread
From: Matthias Schwarzott @ 2007-02-14 0:02 UTC (permalink / raw)
To: linux-hotplug
On Mittwoch, 14. Februar 2007, Arne Ahrend wrote:
> Thanks for replying. I am trying to create a persistent symlink (e.g.
> HL-1050) to the lp0 device.
>
> The modalias or ieee1284_id attributes are in one group, but KERNEL="lp0"
> is in another. So what is the best way to have a symlink /dev/HL-1050 ->
> /dev/usb/lp0 created automatically?
>
> It used to be as easy as
>
> SUBSYSTEM="usb",
> sysfs{modalias}="usb:v04F9p0002d0100dc00dsc00dp00ic07isc01ip02",
> SYMLINK="HL-1050"
>
Why not change that minimally to:
SUBSYSTEM="usb", \
ATTRS{modalias}="usb:v04F9p0002d0100dc00dsc00dp00ic07isc01ip02", \
SYMLINK="HL-1050"
(like output of udevinfo suggests)
and perhaps add a KERNEL="lp*"
--
Matthias Schwarzott (zzam)
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: usblp attributes split in udevinfo
2007-02-13 22:05 usblp attributes split in udevinfo Arne Ahrend
` (2 preceding siblings ...)
2007-02-14 0:02 ` Matthias Schwarzott
@ 2007-02-14 7:18 ` Kay Sievers
2007-02-14 17:40 ` Arne Ahrend
4 siblings, 0 replies; 6+ messages in thread
From: Kay Sievers @ 2007-02-14 7:18 UTC (permalink / raw)
To: linux-hotplug
On Wed, 2007-02-14 at 00:53 +0100, Arne Ahrend wrote:
> On Tue, 13 Feb 2007 23:10:25 +0100
> "Kay Sievers" <kay.sievers@vrfy.org> wrote:
>
> > The next group has
> > > DRIVERS="usblp", but a device which is not suitable for printing. Using its ATTRS{modalias} for my udev printer rules
> > > I get symlinks to device nodes like
> > > crw-rw---- 1 root root 254, 14 2007-02-13 18:53 /dev/usbdev2.3_ep82
> > > and not to /dev/usb/lp0.
> > >
> > > Can anyone shed some light on this?
> >
> > What are you trying to do?
>
>
> Thanks for replying. I am trying to create a persistent symlink (e.g. HL-1050) to the lp0 device.
>
> The modalias or ieee1284_id attributes are in one group, but KERNEL="lp0" is in another.
Udev can match on _all_ parent devices, the attributes don't need to be
at the device itself. ATTRS walk up all parent devices to match, ATTR
looks only at the device itself.
> So what is the best way to have a symlink /dev/HL-1050 -> /dev/usb/lp0 created automatically?
>
> It used to be as easy as
>
> SUBSYSTEM="usb", sysfs{modalias}="usb:v04F9p0002d0100dc00dsc00dp00ic07isc01ip02", SYMLINK="HL-1050"
>
> but that now gives a link to device nodes like /dev/usbdev2.3_ep82 instead of /dev/usb/lp0.
You are matching the "usb_device" event.
Try:
KERNEL="lp*", ATTRS{ieee1284_id}="*HL-1050*", SYMLINK+="HL-1050"
Kay
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: usblp attributes split in udevinfo
2007-02-13 22:05 usblp attributes split in udevinfo Arne Ahrend
` (3 preceding siblings ...)
2007-02-14 7:18 ` Kay Sievers
@ 2007-02-14 17:40 ` Arne Ahrend
4 siblings, 0 replies; 6+ messages in thread
From: Arne Ahrend @ 2007-02-14 17:40 UTC (permalink / raw)
To: linux-hotplug
On Wed, 14 Feb 2007 08:18:49 +0100
Kay Sievers <kay.sievers@vrfy.org> wrote:
> Try:
> KERNEL="lp*", ATTRS{ieee1284_id}="*HL-1050*", SYMLINK+="HL-1050"
Many thanks -- that solves my problem!
Arne
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^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2007-02-14 17:40 UTC | newest]
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2007-02-13 22:05 usblp attributes split in udevinfo Arne Ahrend
2007-02-13 22:10 ` Kay Sievers
2007-02-13 23:53 ` Arne Ahrend
2007-02-14 0:02 ` Matthias Schwarzott
2007-02-14 7:18 ` Kay Sievers
2007-02-14 17:40 ` Arne Ahrend
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