CentOS - May 2012 - Help with writing a udev rule

Can someone please help me with writing a udev rule?

I need /dev/ttyUSB0 to automatically have 777 rights when plugged in.  I'd
like it to only apply to that one specific device.

I'm not sure where to start, what files to look at and also what to write to
make it work.

TIA

Brad
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At Wed, 2 May 2012 16:27:48 +0000 CentOS mailing list <centos at
centos.org> wrote:
> 
> Can someone please help me with writing a udev rule?
> 
> I need /dev/ttyUSB0 to automatically have 777 rights when plugged in. 
I'd like it to only apply to that one specific device.
> 
> I'm not sure where to start, what files to look at and also what to
write to make it work.
Does this give you a clue:

sauron.deepsoft.com% cat /etc/udev/rules.d/10-local.rules
#KERNEL="ttyS0", SYMLINK="mouse"
#KERNEL="mice",         
NAME="input/%k",SYMLINK="mouse"
KERNEL=="ttyS4", SYMLINK="modem"
KERNEL=="ttyS5", SYMLINK="back", MODE="0666"
KERNEL=="ttyS7", SYMLINK="front", MODE="0666"
#KERNEL=="sr[0-9]*", GROUP="disk", MODE="0666"
#KERNEL=="scd[0-9]*", GROUP="disk", MODE="0666"
#KERNEL=="hd[a-z]", BUS=="ide",
SYSFS{removable}=="1",
PROGRAM=="check-cdrom.sh %k DVD", SYMLINK+="dvdrom"
KERNEL=="sd[a-z]*", BUS=="scsi",
SYSFS{vendor}=="Kingston", NAME="thumb"

Things to note: '/dev/ttyUSB0' is probably not a good name (I get away
with ttyS4, ttyS5, and ttyS7, since these are not hotplugable devices
(they are on a 4 port PCI card).  Anything subject to hot pluging (like
my Kingston thum drive), should probably be using a NAME or SYMLINK
directive and be testing on something like a SYSFS{vendor} or something.
Each time you plug it in the name could change, depending on what else
is plugged in at the time.

You probably want something like:

KERNEL=="ttyUSB*", BUS=="usb",
SYSFS{vendor}=="whatever", MODE="0777",
SYMLINK="USBSerialPort"

Put this in /etc/udev/rules.d/10-local.rules

Replace 'whatever' with the vendor name or use SYSFS{idVendor} and the
hex code, possibly also with a SYSFS{idProduct} test as well. You can
find out what works for the SYSFS keys by looking in
/sys/bus/usb/devices/usb*/* -- the keys are the names of the files and
the values to test for are the contents of these 'files'.

> 
> TIA
> 
> Brad
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>                  
-- 
Robert Heller             -- 978-544-6933 / heller at deepsoft.com
Deepwoods Software        -- http://www.deepsoft.com/
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