libgpiod V2: New Major Release with a Ton of New Features
summary
libgpiod v2 implements a redesigned user API: immutable line info snapshots, separated request config vs line config to avoid reconfigure mistakes, per-request file-descriptor objects with an edge-event buffer to avoid reallocations, line watch/info events to notify status changes, and per-line plus global sequence numbers for ordered events. Kernel side uses the new GPIO character device v2, testing uses gpio-sim via configfs, bindings exist for C, C++ and Python with Rust in progress, CLI adds gpio watch and interactive gpio set; release pending.
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chapters (12)
- 0:00Introduction and speaker background
- 3:15Why libgpiod exists
- 7:08Kernel GPIO character device recap
- 10:25Limitations of libgpiod V1
- 15:25libgpiod V2 API overhaul
- 17:14New line watch feature
- 19:44Compound line configuration
- 22:13Sequence numbers for events
- 23:16Testing with gpio-sim
- 25:05Language bindings and CLI tools
- 27:51Resources and getting involved
- 28:34Q&A on bit-banging and eBPF
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