Re: [PATCH] Update writing udev rules documentation

[sean <seandarcy2@gmail.com>]

Daniel Drake wrote:
> Hi,
> 
> I finally got around to reworking the udev rules documentation. It is 
> now more of a general guide to rule writing and the various things you 
> can do, with examples.
> 
> The patch isn't very readable, if anyone wants to review the changes I 
> suggest you just look at the online version as almost all of it has been 
> rewritten:
> http://www.reactivated.net/writing_udev_rules.html
> 
> Comments appreciated.
> 
> Daniel

Even this late?

Just been trying to set up a usb printer.

 From Writing udev rules:

Examples
USB Printer

I power on my printer, and it is assigned device node 
/dev/lp0. Not satisfied with such a bland name, I decide to 
use udevinfo to aid me in writing a rule which will provide 
an alternative name:

# udevinfo -a -p $(udevinfo -q path -n /dev/lp0)
........

At least on my fc6-test1 ( 2.6.18-rc1) machine, /dev/lp0 is 
for the parallel port (even though no printer is attached ) 
and /dev/usb/lp0 is for the usb printer.


dmesg |grep lp0
PM: Adding info for No Bus:lp0
drivers/usb/class/usblp.c: usblp0: USB Bidirectional printer 
dev 2 if 1 alt 0 proto 2 vid 0x04B8 pid 0x0803
lp0: using parport0 (interrupt-driven).
lp0: console ready
drivers/usb/class/usblp.c: usblp0: off-line

Did earlier kernels use lp0 for usb printers? If not, how about:

I power on my printer, and it is assigned device node 
/dev/usb/lp0. Not satisfied with such a bland name, I decide 
to use udevinfo to aid me in writing a rule which will 
provide an alternative name:

# udevinfo -a -p $(udevinfo -q path -n /dev/usb/lp0)


sean




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