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List:       linux-hotplug
Subject:    Re: udev - ttyACM0
From:       "Gerold J. Wucherpfennig" <gjwucherpfennig () gmx ! net>
Date:       2005-05-12 12:31:47
Message-ID: 200505121431.47611.gjwucherpfennig () gmx ! net
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Thanks a lot for replying to my latest posting :-)
 
Every time I want to use the USB Modem for the first time after a system
(re)boot I have to do

mknod /dev/ttyACM0 c 166 0

manually to get the device file though

/sys/class/tty/ttyACM0/ is present

root@localhost ~]# ls -l /sys/class/tty/ttyACM0/
total 0
-r--r--r--    1 root     root         4096 May 12 13:33 dev
lrwxrwxrwx    1 root     root            0 May 12 13:33 device 
-> ../../../devices/pci0000:00/0000:00:10.1/usb2/2-1/2-1.1/2-1.1:2.0
lrwxrwxrwx    1 root     root            0 May 12 14:05 driver 
-> ../../../bus/usb/drivers/cdc_acm
[root@localhost ~]#

[root@localhost ~]# cat /sys/class/tty/ttyACM0/dev
166:0
[root@localhost ~]#

On Tuesday 10 May 2005 23:43, Greg KH wrote:
> On Sun, May 08, 2005 at 10:49:08AM +0200, Gerold J. Wucherpfennig wrote:
> > Unfortunately udev doesn't create ttyACMx devices though they are listed
> > in /sys/class/tty/. The udev developers seemed to have forgotten this
> > devices.
>
> Why does udev have to do anything special for acm devices, they should
> work just fine.  Do your devices not work properly somehow?
>

On Monday 09 May 2005 22:01, Kay Sievers wrote:
> On Mon, 2005-05-09 at 19:07 +0200, Gerold J. Wucherpfennig wrote:
> > No response, very sad...
> > Can at least anybody confirm that NO ttyACM device files are created
> > though CDC_ACM devices are present? Is there anybody else with a CDC_ACM
> > device?
>
> I don't know if that device will work - never tried that. But
> udev works perfectly with my mobile phone:
>
>   [kay@pim ~]$ ls -la /dev/ttyACM0
>   crw-rw----  1 root root 166, 0 May  9 21:57 /dev/ttyACM0
>
>   [kay@pim ~]$ tree /sys/class/tty/ttyACM0/
>   /sys/class/tty/ttyACM0/
>
>   |-- dev
>
>   `-- device -> ../../../devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.1
>
>
> Kay




Thanks for replying


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