On Fri, Nov 07, 2008 at 12:38:44AM +0900, J.H.Kim wrote: > Hi, everyone > > I'm looking for codes which makes dev files (for example, /dev/usb/lp0 for > usb printer) of USB character devices. > > Is it udev or kernel driver module? udev. > If it is udev, how does it determine the major and minor number of the > device? >From the "dev" file in the sys/class/... file for the device, or from the uevent itself. newer versions of udev only use the uevent, and don't need sysfs. > The uevent message from kernel for usb printer seems not to include the > information on the major and minor numbers. > Captured uevent message for usb printer was like this : > ACTION=add > DEVPATH=/devices/pci0000:00/0000:00:1d.3/usb4/4-2/4-2:1.0 > SUBSYSTEM=usb > DEVTYPE=usb_interface > DRIVER=usblp > PHYSDEVBUS=usb > PHYSDEVDRIVER=usblp > DEVICE=/proc/bus/usb/004/002 > PRODUCT=3f0/8604/100 > TYPE=0/0/0 > INTERFACE=7/1/2 > MODALIAS=usb:v03F0p8604d0100dc00dsc00dp00ic07isc01ip02 > SEQNUM=940 That's not the device that you are looking for to create the dev node. Wait a bit and look at the uevent for the USB lp0 device. thanks, greg k-h -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
