devm_acpi_in...tify_handler(9)

📦 version 7.3.1, in nixpkgs unstable

✨ devm_acpi_install_notify_handler ✨

okay so bestie, welcome to the Kernel API Manual 💖 this one's a little devres-flavoured gem from the ACPI corner of the kernel, and honestly? it's giving "set it and forget it" energy. let's get into it 🫶

🎀 NAME 🎀

devm_acpi_install_notify_handler — install an ACPI notify handler for a managed device. yes, managed means the kernel cleans up after you. slay 💅

🌸 SYNOPSIS 🌸

int devm_acpi_install_notify_handler (struct device *dev , u32
handler_type , acpi_notify_handler handler , void *context );

literally just four args, no cap ✨

🦋 ARGUMENTS 🦋

  • dev — the device you're installing a notify handler for 💫
  • handler_type — the type of the notify handler, like which flavour of notification you're signing up for 🍓
  • handler — the actual handler function you're installing, the main character of this whole operation 👑
  • context — the data that gets passed back to your handler function later, so it remembers who it is 🧚

💜 DESCRIPTION 💜

so what does this thing actually do? it performs the exact same job as acpi_dev_install_notify_handler — called for the ACPI companion of dev, with the same handler_type, handler, and context arguments — but with one iconic twist: the ACPI notify handler it installs gets automatically removed on driver detach 😭🔥 no manual cleanup arc, no messy teardown era. it's giving devres magic and we're obsessed.

but listen, bestie, there's a whole caveat section and you need to read it 🙈:

callers should ensure that all resources used by handler have been allocated prior to invoking this function. and if you do that, those resources should be devres-managed so that they won't be released before the notify handler removal. otherwise? you're gonna need special synchronization between handler and the management of those resources. fr fr, don't skip this part 💀

and when the request fails, an error message is printed. don't add extra error messages at the call sites. the function already said what it had to say, okay? let it cook 🫶

⭐ RETURN ⭐

0 on success, or a negative error number if things went sideways 💖

🌈 SEE ALSO 🌈

all the ACPI besties you might wanna hang out with next, from the kernel file ./drivers/acpi/bus.c:

and that's the whole page, bestie 🎀 this one came out of ./drivers/acpi and it's dated October 2026 — so like, fresh out of the kernel oven 🔥 mwah, go install your notify handler responsibly 💅✨

📦 where this page comes from