2020-11-10 21:09:13 -05:00
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---
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title: "Custom Device Paths with UDEV rules"
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date: 2020-11-10T20:58:37-05:00
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draft: false
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tags: []
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---
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I wanted to create a rule so that when I plug in my rtlsdr, a symlink to the device will appear in `/dev/rtlsdr`.
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To do this, first we need to get some uniquely identifying information about the SDR.
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```bash
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❯ lsusb
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Bus 001 Device 002: ID 8087:8001 Intel Corp. Integrated Hub
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Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
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Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
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Bus 002 Device 017: ID 0bda:2838 Realtek Semiconductor Corp. RTL2838 DVB-T
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Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
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```
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The part we care about here is the ID field. It is structured as `ID vendor:product`.
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Now we can create a UDEV rule in `/etc/udev/rules.d/` that says "when we see this specific USB plugged in, create a symlink called `rtlsdr`"
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(/etc/udev/rules.d/rtlsdr.rules)
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```
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SUBSYSTEM=="usb", ATTR{idVendor}=="0bda", ATTR{idProduct}=="2838", SYMLINK+="rtlsdr"
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```
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2020-11-10 21:11:03 -05:00
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Tell udev to reload its rules
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```bash
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sudo udevadm control --reload
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```
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Now once you have your device plugged in, you should be able to see it under `/dev/rtlsdr` or whatever you specified your symlink as.
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