uio_register_device(9)

okay bestie, gather ’round — this is the uio_register_device(9) page from the Kernel API Manual, and it’s lowkey a whole moment. 💅

✨ NAME ✨

uio_register_device — register a new userspace IO device. that’s the name, that’s the vibe, no cap. 🫶

🦋 SYNOPSIS 🦋

uio_register_device (parent , info );

🎀 ARGUMENTS 🎀

• parent — the parent device. it’s giving “device family tree” energy. 🌳
• info — the UIO device capabilities. this is the little packet of info that says what the device can do. ✨

💅 DESCRIPTION 💅

okay so when you call this icon, it returns zero on success or a negative error code. that’s literally the return-value tea: 0 = slay, negative = error code. periodt. 🍵

🌈 SEE ALSO 🌈

go peek at the Kernel file ./include/linux/uio_driver.h and these iconic buddies:

• struct uio_mem(9)
• struct uio_port(9)
• struct uio_info(9)
• devm_uio_register_device(9)

and that’s the page, bestie — brought to you by ./include/linux, October 2026. mwah 💋✨