__uio_register_device(9)

✨ __uio_register_device(9) ✨

okay so this is the Kernel API Manual page for __uio_register_device and bestie, it's literally the "hey kernel, meet your new userspace IO device" function 💖 nothing more, nothing less, and we're gonna go through it together, no cap.

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🌸 NAME 🌸

__uio_register_device — register a new userspace IO device

like, that's the whole gig. it makes the kernel aware of a fresh UIO device. slay. 👑

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🎀 SYNOPSIS 🎀

int __uio_register_device (struct module *owner , struct device *parent
, struct uio_info *info );

that's the signature, copied exactly, don't come for me about the spacing 💅

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🦋 ARGUMENTS 🦋

• owner — the module that creates the new device 🫶 like, who's the parent... no wait, that's the next one, this is the module doing the creating.
• parent — the parent device 🌈 the device that this new one hangs off of, its main character origin story if you will.
• info — the UIO device capabilities ⭐ all the good stuff about what this device can actually do lives in here.

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💜 DESCRIPTION 💜

so what does it actually return? okay so: it returns zero on success, or a negative error code if things went sideways 😭 that's it, that's the description. short and iconic.

ngl bestie, "negative error code" means something went wrong — always check the return value, fr fr. 🙈

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🔥 SEE ALSO 🔥

• Kernel file ./drivers/uio/uio.c 📁 — the whole neighbourhood this function lives in
• uio_event_notify(9)
• uio_interrupt_handler(9)
• uio_interrupt_thread(9)
• __devm_uio_register_device(9)
• uio_unregister_device(9)

go read those next, iykyk 🧚

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that's the whole page bestie, every last crumb of it 🍓 this little gem comes to you from ./drivers/uio, dated October 2026 — periodt, that's the source and the date, and now you know 💖✨🎀