v4l2_device_call_all(9)

📦 version 7.3.1, in nixpkgs unstable

💅 v4l2_device_call_all 💅

okay so bestie, welcome to the Kernel API Manual — yes that Kernel API Manual, the one your kernel-dev crush keeps quoting. today's main character is v4l2_device_call_all, and honestly? she's a vibe.

✨ NAME ✨

v4l2_device_call_all — Calls the specified operation for all subdevs matching the &v4l2_subdev.grp_id, as assigned by the bridge driver.

like, all of them. every single subdev that matches. she does not do halfway 💅

🎀 SYNOPSIS 🎀

v4l2_device_call_all (v4l2_dev , grpid , o , f , args... );

one line, five-ish things, zero drama. slay.

🦋 ARGUMENTS 🦋

  • v4l2_dev — the struct v4l2_device that owns the sub-devices you're about to iterate over. think of it as the group chat admin 👑
  • grpid — the struct v4l2_subdev->grp_id group ID to match. pass 0 to match them all — no cap, 0 is the "everyone's invited" of group IDs 🫶
  • o — the name of the element at struct v4l2_subdev_ops that contains f. each element in there groups together a whole set of operation functions, like little friend groups ✨
  • f — the operation function that gets called if cond matches. these operation functions are defined in groups, according to each element at struct v4l2_subdev_ops. so o picks the friend group, f picks the specific bestie 💖
  • args — the arguments for f. you know, the snacks you bring to the function 🍓

🌸 DESCRIPTION 🌸

Ignore any errors.

that's it. that's the whole description. she is unbothered, she is moisturized, she is in her lane. errors? never heard of her 💀✨

🔥 NOTE 🔥

subdevs cannot be added or deleted while walking the subdevs list. do not try it. this is a "look with your eyes, not your hands" situation bestie 😭🙈

🌈 SEE ALSO 🌈

the whole squad, in order, no one left out 👑

k that's the whole page bestie, go forth and call all the subdevs 🧚‍♀️💜

— signed off with love from ./include/media, dated October 2026, version vibes only. bye pookie 🎀✨

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