From: "Grischa Stegemann" <gs-ml@gmx.net>
To: linux-hotplug@vger.kernel.org
Subject: udev does not create ttyUSB devices for Visor
Date: Tue, 07 Mar 2006 22:13:40 +0000 [thread overview]
Message-ID: <1469.1141769620@www024.gmx.net> (raw)
I have a Handspring Visor device which is supposed to communicate with my
computer using the usb-serial driver.
My udev version is 056 (Debian stable, Kernel 2.6.15.1) and it fails to
create the appropriate device nodes ttyUSB0 and ttyUSB1. When I hit the
hotsync-button on the cradle the kernel recognizes the device correctly:
localhost kernel: usb 1-2: Handspring Visor now attached to ttyUSB0
localhost kernel: usb 1-2: Handspring Visor now attached to ttyUSB1
The simple udev-rule
KERNEL="ttyUSB[0-9]*", NAME="%k"
should now yield the corresponding devices, but it does not. It is
perfectly ignored by udev and I cannot figure out why. There's no problem
with any other device.
It becomes even weirder (for me) if I create the device-nodes by hand:
mknod /dev/ttyUSB0 c 188 0; mknod /dev/ttyUSB1 c 188 1
Now I can communicate with my Visor. BUT once the hotsync-procedure is
finished, the visor disconnects completely from the computer, the
usb-driver deregisters the device and -guess what!- NOW udev removes the
corresponding ttyUSB-nodes.:(
How comes udev is ignoring the device during registering but removes the
device nodes during deregistering the device?
It also removes them if I have absolutely no rule concerning ttyUSB
at all.
Any suggestion and/or clarification is greatly appretiated.
Grischa
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next reply other threads:[~2006-03-07 22:13 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-07 22:13 Grischa Stegemann [this message]
2006-03-07 23:07 ` udev does not create ttyUSB devices for Visor Kay Sievers
2006-03-08 0:43 ` Greg KH
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