acpi_device_modalias(9)

💅 acpi_device_modalias(9) 🎀

okay so welcome to the Kernel API Manual page for acpi_device_modalias(9), bestie. This is the whole vibe: a kernel API function that deals with the modalias sysfs attribute for ACPI-enumerated devices. Keep your struct device * close and your buffer closer. 💖

🌸 NAME 🌸

acpi_device_modalias — modalias sysfs attribute for ACPI-enumerated devices.

✨ SYNOPSIS ✨

int acpi_device_modalias (struct device *dev , char *buf , int size );

That's the whole signature, no cap.

🫶 ARGUMENTS 🫶

• dev — the struct device to get the ACPI device node. It's giving “where’s the ACPI node?” energy.
• buf — the buffer to save pnp_modalias and of_modalias. Bestie, this is where the good stuff goes.
• size — size of buffer. Yes, the size of the buffer, and yes it matters.

💖 DESCRIPTION 💖

Create the modalias sysfs attribute for ACPI-enumerated devices. That's the main character job, fr fr.

Why does this exist? Because other buses do not support ACPI HIDs & CIDs. So, e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get: "acpi:IBM0001:ACPI0001". The way that string comes together is honestly iconic. ✨

👑 SEE ALSO 👑

Go look at these, bestie:

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

xoxo bestie 💅 source/version is ./drivers/acpi, dated October 2026, and the page is acpi_device_modalias(9). slay. 🎀✨