Blog entries tagged with "udev"

Naming devices under Linux

Thursday, November 28th, 2013 at 8:49 pm

When I recently started monitoring temperature it involved a USB to RS-232 adapter connected to my Linux box. A few weeks later I plugged in a USB device to monitor power usage.

Temperature was via /dev/ttyUSB0 and power was via /dev/ttyUSB1. Until an unscheduled reboot at which point they swapped around as that was the order the devices are detected at boot, not the order in which they were plugged in.

A quick search led me to discover that you can write rules for udev to give devices persistent names.

Relying heaving on Writing udev rules I muddled through to these rules:

SUBSYSTEM=="tty", ATTRS{product}=="USB2.0-Serial", SYMLINK+="digitemp"
SUBSYSTEM=="tty", ATTRS{product}=="RFA-Z106*", SYMLINK+="raven"

The generic RS-232 adapter now comes up under /dev/digitemp and the Raven comes up under /dev/raven. Now my monitoring will survive a reboot.

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