Linking Node Names to Custom Names with Udev

This guide explains how to assign a custom name to a device node using udev rules. Follow the steps below to create a persistent and meaningful device name.

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Step 1: Identify the Device Attributes

Run the following command to inspect the device’s attributes and find its unique identifiers (e.g., idVendor and idProduct):

udevadm info -a -n /dev/ttyUSB0 $(udevadm info -q path -n /dev/ttyUSB0)

This command provides detailed information about the device at /dev/ttyUSB0.

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Step 2: Create or Edit the Udev Rule File

1. Open (or create) a file for udev rules in the /etc/udev/rules.d/ directory. For example:

   sudo subl /etc/udev/rules.d/serial-symlinks.rules
   

2. Add a rule using the attributes you identified. For instance:

   ACTION=="add", ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6001", SYMLINK+="tty-xxx"
   

   • Replace 0403 and 6001 with the idVendor and idProduct values from your device.
   • The SYMLINK+="tty-xxx" part specifies the custom name (tty-xxx).

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Step 3: Restart Udev

Apply the changes by restarting the udev service:

sudo service udev restart

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Step 4: Verify the Custom Name

Check whether the custom name (tty-xxx) has been created:

ls /dev/tty*

Look for tty-xxx in the list of device nodes.

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Summary of Steps

udevadm info -a -n /dev/ttyUSB0
sudo subl /etc/udev/rules.d/serial-symlinks.rules
# Modify the file to include the udev rule
sudo service udev restart
ls /dev/tty*

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By following these steps, you can assign a persistent custom name to a device node, making it easier to identify and use specific devices in your system.