upgrade to linux kernel's character device API (v2 ABI) #5
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The Linux kernel has finally started phasing out the old userspace API that used sysfs calls for GPIO pins. This phased out API has impacted RPi5 since it exposes the GPIO pins in a new way - using a separate RP1 chip attached to PCI Express. Now, the sysfs approach no longer works as conveniently as it did in the past. The character device API works better and more efficiently with other benefits, namely thread safety, and it is compatible with most Linux distributions.
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The Linux kernel has finally started phasing out the old userspace API that used sysfs calls for GPIO pins.
This phased out API has impacted RPi5 since it exposes the GPIO pins in a new way - using a separate RP1 chip attached to PCI Express. Now, the sysfs approach no longer works as conveniently as it did in the past.
The character device API works better and more efficiently with other benefits, namely thread safety, and it is compatible with most Linux distributions.