STRUCT V4L2_ASYNC_NOTIFIER_OPERATIONS(9)

📦 version 7.3.1, in nixpkgs unstable

💅 struct v4l2_async_notifier_operations(9) — a Kernel API Manual moment

okay so bestie, welcome to the Kernel API Manual ✨ this one is from ./include/media, and it's all about the asynchronous V4L2 notifier operations — yes that is a whole mouthful, i know, but stay with me 🫶

✨ NAME ✨

struct v4l2_async_notifier_operations — Asynchronous V4L2 notifier operations 💫 like, the callback squad for your async notifier, no cap.

🌸 SYNOPSIS 🌸

okay here's the actual struct, copy it exactly bestie, don't be cute with it:

struct v4l2_async_notifier_operations {
    int (*bound)(struct v4l2_async_notifier *notifier, struct v4l2_subdev *subdev, struct v4l2_async_connection *asc);
    int (*complete)(struct v4l2_async_notifier *notifier);
    void (*unbind)(struct v4l2_async_notifier *notifier, struct v4l2_subdev *subdev, struct v4l2_async_connection *asc);
    void (*destroy)(struct v4l2_async_connection *asc);
};

it's giving function-pointer buffet 🍓 four of them, all iconic, all doing their own little job.

🎀 Members 🎀

  • bound — a sub-device has been bound by the given connection 💖 this one fires when the glow-up happens.
  • complete — All connections have been bound successfully. okay so hear me this one is special: the complete callback is only executed for the root notifier 👑 (yes, root. not the little baby notifiers. main character energy only.)
  • unbind — a subdevice is leaving 😭 it's not you it's the driver lifecycle.
  • destroy — the asc is about to be freed 💀 last call, say your goodbyes.

🦋 SEE ALSO 🦋

literally the whole friend group, go say hi:

ngl bestie, if you're touching these callbacks you're already deep in the media subsystem — drink some water 💧 and read the SEE ALSO list before you ship, fr fr 🙈

and that's the tea 🧚 this lil page lives at ./include/media and it's dated October 2026, version and all — so go forth, bind your subdevices, and slay ✨💅🌈

📦 where this page comes from