v4l2_device_register_subdev(9)

📦 version 7.3.1, in nixpkgs unstable

okay so bestie, welcome to the v4l2_device_register_subdev(9) page from the Kernel API Manual — this is the kernel-media moment where a subdev gets registered with a v4l2 device, and it's lowkey iconic 💖

🌸 NAME 🌸

v4l2_device_register_subdev — registers a subdev with a v4l2 device. That's the whole assignment: make the registration happen, bestie 💅

✨ SYNOPSIS ✨

v4l2_device_register_subdev (v4l2_dev , sd );

💖 ARGUMENTS 💖

  • v4l2_dev — pointer to struct v4l2_device 🦋
  • sd — pointer to struct v4l2_subdev 🎀

🦋 DESCRIPTION 🦋

While it's registered, the subdev module is marked as in-use. Yep, that's the state of things — registered means in-use, periodt ✨

And if the module is no longer loaded? You get an error on any attempts to register it. Every attempt. So that's your very important caveat, bestie 😭

🔥 SEE ALSO 🔥

Kernel file ./include/media/v4l2-device.h and struct v4l2_device(9), plus the whole squad:

mwah 💋 this page's source/version is ./include/media, dated October 2026, and it's the v4l2_device_register_subdev(9) page. Bye bestie, go register responsibly 🫶✨

📦 where this page comes from