sysfs & udev & multi-BUS device driver

[Klaus Hitschler <klaus.hitschler@gmx.de>]

Hi,

I'm maintaining a device driver for CAN-BUS interfaces since kernel version 
2.2.x (Controller Area Network - a BUS for automotive use) .  Since that time 
I implemented all that nice kernel features which were coming and going. 
(http://www.peak-system.com/linux)

The driver now comprises support for ISA/PCI/USB/PCMCIA/Parallelport devices. 
All support is done inside the same driver (I know It would be better to 
partion it :-))

Now I plan to add support for udev and sysfs. 

There's one feature I'd like to retain. The current users do know PCI devices 
as /dev/pcan0 to /dev/pcan7, ISA devices as /dev/pcan8 to /dev/pcan15, ..., 
USB devices as /dev/pcan32 to /dev/pcan39, and from /dev/pcan40 start PCMCIA 
based devices.

With udev rules it should be easy to create device nodes with the same 
numbering scheme. But how can I influence the 'kernel name' inside the driver 
so I know that my internal  'minor' 32 matches to /dev/pcan32 ?

Can you link me to some infos that I can fill this mind gap between udev in 
user space and device registration inside a driver.

Do you detect problems if I register the driver multilpe times for each BUS 
ist is associated to?

Regards, Klaus

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