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I previously followed the answer in this question: Attaching USB-Serial device with custom PID to ttyUSB0 on embedded

Now, I need to revert that step so that the device id I echoed to new_id doesn't map to ttyUSB0 every time I connect it. The file, new_id, seems to have '0403 e0d0' permanently written to it now. I've tried to use the unbind file to no luck. There's also no "remove_id" file. Only bind, new_id, uevent, and unbind.

How can I revert this?

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2 Answers 2

Reset to default
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I looked into this, and it does seem like remove_id was never implemented for usb-serial. Should be able to take the work in drivers/usb/core/driver.c and implement remove_id in drivers/usb/serial/bus.c.

Sorry for not having an easy answer.

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  • Wouldn't reinstalling the kernel fix it? Commented Dec 19, 2022 at 17:00
  • @DimaPasechnik just a reboot would do it. No reinstall. Commented Mar 22, 2023 at 23:07
  • You can also do this without a reboot by removing then adding the serial module. sudo modprobe -r usb_serial_simple; sudo modprobe usb_serial_simple. This doesn't remove individual VID:PIDs that you added but will revert the driver back to it's fresh state. Commented Jan 12, 2024 at 22:05
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As @robbat2 states. The remove_id attribute isn't implemented for the generic usb-serial driver. Rather than rebooting the entire system though, you can revert your changes by just unloading and reloading the kernel module. Since this wipes the new_id device table you get your desired effect.

Remove the module

sudo modprobe -r usb_serial_simple

Reinsert the module

sudo modprobe usb_serial_simple
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