comedi_range_is_bipolar(9)

📦 version 7.3.1, in nixpkgs unstable

💅 comedi_range_is_bipolar — the kernel API manual, bestie edition 🎀

okay so real talk, this is a page from the Kernel API Manual (section 9, kernel-flavored, very demure, very minding-its-own-business). It's about comedi_range_is_bipolar and honestly? It's a tiny little function with main character energy. Let's get into it ✨

🌸 NAME 🌸

comedi_range_is_bipolar — the vibe check that tells you whether a subdevice range is bipolar 🦋

✨ SYNOPSIS ✨

bool comedi_range_is_bipolar (struct comedi_subdevice *s , unsigned int
range );

literally just that. one call, one answer, one bool. no cap 💖

🎀 ARGUMENTS 🎀

  • s — your COMEDI subdevice. the whole point of the function, honestly.
  • range — the index of the range within a range table. it's an index, bestie, not a pointer, not a vibe, an index 🔥

💜 DESCRIPTION 💜

so what does it actually do? It tests whether a range is bipolar by checking whether its minimum value is negative. that's the whole test. if the min is negative → bipolar. iconic, efficient, no notes 🌈

two things you need to know though, and I'm saying this with love:

It assumes the range is valid. It does not validate it for you. If you hand it nonsense, that's a you problem, not a comedi_range_is_bipolar problem 😭
It does not work for subdevices using a channel-specific range table list. so if that's your setup, this function is not the one, fr fr 🙈

⭐ RETURN ⭐

  • true — the range is bipolar 💅
  • false — the range is unipolar 🫶

that's it. that's the return. binary queen behavior 👑

🔥 SEE ALSO 🔥

the whole friend group, in the original order, no one left out (iykyk):

Kernel file ./include/linux/comedi/comedidev.h and then:

and that's the page!! 🧚 sources say this one lives over in ./include/linux/comedi, dated October 2026, and it goes by comedi_range_is_bipolar(9). mwah, go check your ranges, bestie 💖🎀💅

📦 where this page comes from