usb_register_dev(9)

💅 usb_register_dev(9) — from the Kernel API Manual, bestie ✨

okay so this is usb_register_dev from section 9, and it's giving "let me introduce my USB device to the kernel and also please give it a minor number" 🎀

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🌸 SYNOPSIS 🌸

int usb_register_dev (struct usb_interface *intf , struct
usb_class_driver *class_driver );

like, exactly that. copy it byte for byte, bestie, don't be creative with it 💀

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✨ ARGUMENTS ✨

• intf — a pointer to the usb_interface that's being registered 🫶 that's the thing you're handing over.
• class_driver — a pointer to the usb_class_driver for this device 💖 the driver's whole little personality, basically.

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🦋 DESCRIPTION 🦋

so every single USB driver that uses the USB major number should be calling this. no cap, all of them 🌈

if CONFIG_USB_DYNAMIC_MINORS is enabled, your minor number gets dynamically allocated out of the list of available ones — the kernel just hands you one, main character energy ✨

if it's not enabled, the minor number is based on the next available free minor, starting at class_driver->minor_base 📍 so that's the starting line, okay?

this function also creates a usb class device in the sysfs tree 🌳 (yes, it's doing the most, and it's slaying).

⚠️ bestie listen — usb_deregister_dev must be called when the driver is done with the minor numbers given out by this function. that's not optional, that's periodt. don't leave the kernel hanging 😭

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🔥 RETURN 🔥

• -EINVAL — if something bad happens while trying to register a device 💀 (iykyk, it's the "that went wrong" number)
• 0 — on success 👑 iconic, we love a zero

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🌟 SEE ALSO 🌟

• Kernel file ./drivers/usb/core/file.c 📄
• usb_deregister_dev(9) — the cleanup bestie, go read it too 💜

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and that's the whole vibe, fr fr 🧚 this page came from ./drivers/usb/core and it's dated October 2026 — so bye bestie, go register that device 💅