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Regular generated paths make it hard to identify individual GPIO devices. This is a challenge when using multiple USB-to-GPIO adapters like Diolan DLN2. The unique symlinks from this rule can be used, e.g., with gpiod tools.
18 lines
579 B
Plaintext
18 lines
579 B
Plaintext
# do not edit this file, it will be overwritten on update
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ACTION=="remove", GOTO="gpiochip_end"
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SUBSYSTEM!="gpio", GOTO="gpiochip_end"
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KERNEL!="gpiochip[0-9]*", GOTO="gpiochip_end"
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IMPORT{builtin}="path_id"
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ENV{ID_PATH_WITH_USB_REVISION}=="?*", SYMLINK+="gpio/by-path/$env{ID_PATH_WITH_USB_REVISION}"
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SUBSYSTEMS=="usb", IMPORT{builtin}="usb_id"
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ENV{ID_BUS}=="", GOTO="gpiochip_end"
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ENV{ID_SERIAL}=="", GOTO="gpiochip_end"
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ENV{ID_USB_INTERFACE_NUM}=="", GOTO="gpiochip_end"
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SYMLINK+="gpio/by-id/$env{ID_BUS}-$env{ID_SERIAL}-if$env{ID_USB_INTERFACE_NUM}"
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LABEL="gpiochip_end"
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