create_pnp_modalias(9)

✨ create_pnp_modalias ✨

okay so bestie, welcome to create_pnp_modalias(9) — a little function from the Kernel API Manual that literally builds hid/cid(s) strings for modalias and uevent. it's giving humble-but-essential, fr fr 💅

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🌸 SYNOPSIS 🌸

int create_pnp_modalias (const struct acpi_device *acpi_dev , char
*modalias , int size );

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🎀 ARGUMENTS 🎀

• acpi_dev — the ACPI device object in question. the main character of this whole operation 🫶
• modalias — the buffer you're printing into. this is where the string goes, no cap.
• size — the size of that buffer. gotta know your limits, bestie ✨

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🦋 DESCRIPTION 🦋

so what does it actually do? it creates the hid/cid(s) string that's needed for modalias and uevent. iconic behaviour, honestly.

like, for example — on a device with hid:IBM0001 and cid:ACPI0001, you get:

char *modalias: "acpi:IBM0001:ACPI0001"

that's it, that's the whole vibe. the string just gets assembled and printed into your buffer. lowkey elegant 🌈

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💖 RETURN 💖

• 0 — no _HID and no _CID
• -EINVAL — output error
• -ENOMEM — output is truncated

💀 pay attention to that last one: if your buffer is too small, you get -ENOMEM and the output is truncated. size matters, bestie, that's why size is right there in the argument list 🙈

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👑 SEE ALSO 👑

• Kernel file ./drivers/acpi/device_sysfs.c
• create_of_modalias(9)
• acpi_device_uevent_modalias(9)
• acpi_device_modalias(9)
• acpi_device_setup_files(9)
• acpi_device_remove_files(9)

all the sibling functions, the whole friend group 🫶 go read them, iykyk.

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⭐ that's the page!! sourced from the ./drivers/acpi directory, dated October 2026, and yes, create_pnp_modalias(9) is the name of the game. periodt. 🎀💜