lwmi_dev_evaluate_int(9)

💅 lwmi_dev_evaluate_int(9) — the Kernel API Manual glow-up 🎀

okay so you're in the lwmi_dev_evaluate_int girlies now?? welcome to the Kernel API Manual, bestie, this is literally the page for the helper function that calls WMI methods which return an integer. iykyk ✨

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✨ NAME ✨

lwmi_dev_evaluate_int — the helper function you use when you need to call WMI methods that hand you back an integer. no cap, that's the whole job description 🫶

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🌸 SYNOPSIS 🌸

int lwmi_dev_evaluate_int (struct wmi_device *wdev , u8 instance , u32
method_id , unsigned char *buf , size_t size , u32 *retval );

like, look at her. six arguments, all present and accounted for 💅

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🦋 ARGUMENTS 🦋

• wdev — pointer to the WMI device you're calling. the main character, fr 🔥
• instance — the instance of the called method. yes it's a u8, don't come for her.
• method_id — the WMI Method ID for the method you want to call. this is how the kernel knows which one you mean 👑
• buf — the buffer holding all the arguments for the given method_id. everything you're passing in lives here.
• size — length of the buffer. respect her boundaries 🎀
• retval — pointer where the return value gets assigned. she's an output param and she's thriving ✨

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💖 DESCRIPTION 💖

so what does she actually do? she calls wmidev_evaluate_method for Lenovo WMI devices that return an ACPI integer — that's the vibe check she runs. then she validates the return value type and assigns the value to the retval pointer. clean, efficient, iconic. no notes 💅

lowkey the important part: retval is a pointer, so the value gets written through it. you're not getting a return value back from the function itself — that's the int in the synopsis and it's a whole different thing, bestie, don't mix them up 🙈

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⭐ RETURN ⭐

0 on success, or an error code. that's it, that's the tea ☕

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/platform/x86/lenovo/wmi-helpers.c — go read the source, it's giving main character energy 🦋
• lwmi_tm_register_notifier(9)
• lwmi_tm_unregister_notifier(9)
• devm_lwmi_tm_unregister_notifier(9)
• devm_lwmi_tm_register_notifier(9)
• lwmi_tm_notifier_call(9)
• lwmi_debugfs_create_dir(9)

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and that's the whole page, bestie 🍓 she lives in ./drivers/platform/x86/lenovo, version October 2026, and she's filed under lwmi_dev_evaluate_int(9) — go forth and call your WMI methods responsibly 💜🧚‍♀️