wmi_install_notify_handler(9)

💅 wmi_install_notify_handler — kernel API manual, bestie edition ✨

Okay so we're looking at wmi_install_notify_handler, a page straight out of the Kernel API Manual, and the very first thing you need to know is that this one is deprecated 😭 — like, it still exists, it still works, but it's giving "we don't do that anymore." Do with that information what you will, but I said what I said. 🫶

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🌸 NAME 🌸

wmi_install_notify_handler — register a handler for WMI events, and yes, it's deprecated (I'm not being dramatic, it's literally in the name section 💀).

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✨ SYNOPSIS ✨

acpi_status wmi_install_notify_handler (const char *guid ,
       wmi_notify_handler handler , void *data );

That's the whole vibe — three args, one acpi_status coming back at you. 🎀

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🦋 ARGUMENTS 🦋

• guid — a 36 char string, and it's gotta be in this exact shape: fa50ff2b-f2e8-45de-83fa-65417f2f49ba. Thirty-six characters, dashes and all, no freestyling. 🔥
• handler — the function that handles the notifications. This is your girl, she does the actual work when the event fires. 👑
• data — data to be returned to handler when the event is fired. It gets handed right back to your handler, so put whatever you need in there. 🎁

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💜 DESCRIPTION 💜

So what does it actually do? It registers a handler for events sent to the ACPI-WMI mapper device. That's it, that's the whole thing. You bring the guid, you bring the handler, you bring the data, and the kernel wires it up for you. Slay. ✨

Ngl though, this function is deprecated — keep that in mind before you build your whole main character energy around it. 💅

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🌈 RETURN 🌈

Returns an acpi_status — it's signaling success or error. Check it, bestie, don't just assume it worked. 😭

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🍓 SEE ALSO 🍓

Kernel file ./drivers/platform/wmi/core.c, plus this absolutely stacked lineup of friends:

• wmi_instance_count(9)
• wmidev_instance_count(9)
• wmi_evaluate_method(9)
• wmidev_evaluate_method(9)
• wmidev_invoke_method(9)
• wmidev_invoke_procedure(9)
• wmi_query_block(9)
• wmidev_block_query(9)
• wmidev_query_block(9)
• wmi_set_block(9)
• wmidev_block_set(9)
• wmidev_set_block(9)
• wmi_remove_notify_handler(9)
• wmi_has_guid(9)
• wmi_get_acpi_device_uid(9)
• wmi_driver_unregister(9)

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And that's a wrap, bestie! 🧚 This edition lives in ./drivers/platform/wmi, dated October 2026, and it's all about wmi_install_notify_handler(9). Go forth, register your handlers, and remember: deprecated doesn't mean unlovable 💖🦋🌟