subdev_8255_mm_init(9)

📦 version 7.3.1, in nixpkgs unstable

💅 subdev_8255_mm_init(9) — Kernel API Manual ✨

okay so this is subdev_8255_mm_init(9), and honestly? she's the mmio-flavored sibling in the 8255 init family and she serves. grab a snack, bestie, this one's short but iconic 🎀

🌸 NAME 🌸

subdev_8255_mm_init — initialize DIO subdevice for driving mmio-mapped 8255

like, literally that's the whole job. she sets up a DIO subdevice so it can drive an 8255 chip that's sitting out there in mmio land 💖

✨ SYNOPSIS ✨

int subdev_8255_mm_init (struct comedi_device *dev , struct comedi_subdevice *s , unsigned long regbase );

three args, one int back. no cap, that's it 🫶

🦋 ARGUMENTS 🦋

  • dev — the comedi device that owns the subdevice. main character energy, she's in charge of the whole situation 👑
  • s — the comedi subdevice you're actually initializing. this is the one getting the glow-up ✨
  • regbase — the offset of the 8255 registers from dev->mmio. so like, where the registers live relative to the mmio base. iykyk 📍

🧚 DESCRIPTION 🧚

Initializes a comedi subdevice as a DIO subdevice driving an 8255 chip.

that's the tea. you hand her a comedi device, a subdevice and a register base offset, and she turns that subdevice into a DIO subdevice that drives an 8255 chip. it's giving "small function, big responsibility" 💅

⭐ RETURN ⭐

  • -ENOMEM if it failed to allocate memory 😭 (the allocation did NOT slay)
  • zero on success 🎉 (slay, periodt)

🔥 SEE ALSO 🔥

the whole 8255 friend group, fr fr — go say hi to the io and cb variants when you're done here 🌈

and that's the whole page, bestie! 💖 this one came from ./drivers/comedi/drivers, dated October 2026, and you just read subdev_8255_mm_init(9) — go forth and initialize something iconic 💅✨

📦 where this page comes from