parport_register_port(9)

🌸 NAME 🌸

parport_register_port — register a parallel port. This page is parport_register_port(9) from the Kernel API Manual, and it's giving main character energy, no cap ✨

🛠️ SYNOPSIS 🛠️

struct parport * parport_register_port (unsigned long base , int irq , int dma , struct parport_operations *ops );

🎀 ARGUMENTS 🎀

• base — base I/O address
• irq — IRQ line
• dma — DMA channel
• ops — pointer to the port driver's port operations structure

💖 DESCRIPTION 💖

okay so bestie, picture this: a parallel port (lowlevel) driver finds a port that should be made available to parallel port device drivers. When that happens, it should call parport_register_port. Periodt. 💅

The base, irq, and dma parameters are lowkey for the convenience of port drivers — and for ports where they aren't meaningful, they needn't be set to anything special. They can be altered afterwards by adjusting the relevant members of the parport structure that is returned and represents the port.

⚠️ But they should not be tampered with after calling parport_announce_port, however. That's the cutoff, bestie — highkey important.

If there are parallel port device drivers in the system that have registered themselves using parport_register_driver, they are not told about the port at this time; that is done by parport_announce_port. Not me expecting the announcement to happen early — nope, that's literally parport_announce_port's job 😭

The ops structure is allocated by the caller, and must not be deallocated before calling parport_remove_port. Keep it alive until then, fr fr. 🫶

⚠️ If there is no memory to allocate a new parport structure, this function will return NULL. Ngl, that's the failure vibe check. 💀

🌈 SEE ALSO 🌈

Kernel file ./drivers/parport/share.c — __parport_register_driver(9), parport_unregister_driver(9), parport_get_port(9), parport_put_port(9), parport_announce_port(9), parport_remove_port(9), parport_register_dev_model(9), parport_unregister_device(9), parport_find_number(9), parport_find_base(9), parport_claim(9), parport_claim_or_block(9), parport_release(9).

Source/version: ./drivers/parport · date: October 2026 · page: parport_register_port(9) — bye bestie, go register those ports responsibly 💜🦋