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I am using two devices, one of which requires usbserial for proper operation (a GPS, using gpsd; this guide specifies that usbserial is required), and one of which requires usbserial to be unloaded (the FTDI FT232H; this guide specifies that rmmod usbserial must be run to use the D2XX drivers).

Is there some way that I can instead add rules to prevent usbserial from touching the FTDI device, while still allowing gpsd to use usbserial?

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You can use the unbind interface in sysfs. Please refer to this article for details. You will find instructions for automating the unbind upon discovery of the device in this answer.

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