RE: Question about Hot device Identity

["Guo, Min" <min.guo@intel.com>]

I can not find the file dev in the /sys/class/usb, does it means that 
Udev does not support my USB CDROM? If not, which file is behalf of 
my USB CDROM device?

you said that udev only creates dev entries for things that show up in
/sys/class/* that have a file called "dev" in them, in my machine,

# ls /sys/
block  bus  cdev  class  devices  firmware
#ls /sys/class/usb/
#ls /sys/bus/usb/devices/
Both the outputs are null, I think the system has not recognized the USB devices, is that right?

Oh, the second question is whether the patch for Udev to support USB mice 
has been applied to kernel 2.5.73?

Thank you very much!

Thanks
Guo Min


-----Original Message-----
From: Greg KH [mailto:greg@kroah.com]
Sent: Thursday, June 26, 2003 1:01 AM
To: Guo, Min
Cc: linux-hotplug-devel@lists.sourceforge.net
Subject: Re: Question about Hot device Identity


On Wed, Jun 25, 2003 at 05:05:22PM +0800, Guo, Min wrote:
>  I download the linux2.5.73 and use USB CDROM to do the testing.
> ls /sysfs

Why /sysfs?  Why not /sys like everyone is standardizing on?

> > block  bus  cdev  class  devices  firmware
> ls /sysfs/class
> >firmware  input  net  pcmcia_socket  scsi_device  scsi_host  tty  usb
> ls /sysfs/block
> > fd0  hda  initrd  sda
> ls /sysfs/devices/pci0
> >0000:00:00.0  0000:00:02.0  0000:00:0f.0  0000:00:0f.2  power
> 0000:00:00.1  0000:00:03.0  0000:00:0f.1  name
> ls /sysfs/devices/pci0/0000\:00\:0f.2/
> >class   irq   power     subsystem_device  vendor
> device  name  resource  subsystem_vendor
> 
> 
> 0000:00:0f.2 is my USB controller.
> So ,in such environment, how to configure DEVPATH in test file?

udev only cares about DEVPATH values for class devices.  It ignores
DEVPATH values for other kinds of devices.  So set it to your block
device and you should be fine.

> Another question is whether 2.5.73 supports USB mice?

Yes, the kernel does.  Even 2.2 does :)

greg k-h


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