From mboxrd@z Thu Jan  1 00:00:00 1970
From: Arne Ahrend <aahrend@web.de>
Date: Tue, 13 Feb 2007 22:05:20 +0000
Subject: usblp attributes split in udevinfo
Message-Id: <20070213230520.64fe8c2b.aahrend@web.de>
List-Id: <linux-hotplug.vger.kernel.org>
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To: linux-hotplug@vger.kernel.org

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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