comedi_chan..._is_unipolar(9)

💅 comedi_chan_range_is_unipolar — the Kernel API Manual, but make it make sense

okay so bestie, we're in the Kernel API Manual today and this one's a lil function called comedi_chan_range_is_unipolar and honestly? she's a whole vibe check for your ranges. let's get into it 🎀

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✨ NAME ✨

comedi_chan_range_is_unipolar — she tests whether a channel-specific range is unipolar. that's it, that's the job 💅

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🦋 SYNOPSIS 🦋

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

like look at her. three args, returns a bool, no drama 🌸

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🎀 ARGUMENTS 🎀

• s — the COMEDI subdevice. the main character, the one we're snooping on 👑
• chan — the channel number. which channel we're talking about, iykyk
• range — the index of the range within a range table. it's a position, not the range itself, don't come for me 😭

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🌈 DESCRIPTION 🌈

so what she actually does: she tests whether a range is unipolar by checking whether its minimum value is at least 0. that's the whole test. if the floor of the range is zero or above, she's unipolar, slay ✨

⚠️ ok important caveat bestie, listen up: this function assumes chan and range are valid. no validation, no vibe check, no nothing — you hand her garbage and that's on you fr fr.

also she only works for subdevices with a channel-specific range table list. if your subdevice doesn't have one of those, this is not the function for you, periodt.

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💖 RETURN 💖

• true — if the range is unipolar 🎉
• false — if the range is bipolar 😔

it's giving binary. it's giving decisive. we love her for it.

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👀 SEE ALSO 👀

okay this list is long but every single one of these is invited to the party, no cap:

• Kernel file ./include/linux/comedi/comedidev.h
• struct comedi_subdevice(9)
• struct comedi_buf_page(9)
• struct comedi_buf_map(9)
• struct comedi_async(9)
• enum comedi_cb(9)
• struct comedi_driver(9)
• struct comedi_device(9)
• struct comedi_lrange(9)
• comedi_range_is_bipolar(9)
• comedi_range_is_unipolar(9)
• comedi_range_is_external(9)
• comedi_chan_range_is_bipolar(9)
• comedi_chan_range_is_external(9)
• comedi_offset_munge(9)
• comedi_bytes_per_sample(9)
• comedi_sample_shift(9)
• comedi_bytes_to_samples(9)
• comedi_samples_to_bytes(9)
• comedi_check_trigger_src(9)
• comedi_check_trigger_is_unique(9)
• comedi_check_trigger_arg_is(9)
• comedi_check_trigger_arg_min(9)
• comedi_check_trigger_arg_max(9)
• comedi_buf_n_bytes_ready(9)
• __comedi_request_region(9)
• comedi_request_region(9)
• module_comedi_driver(9)

like genuinely go read the siblings, they're all iconic in their own way 🫶

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and that's the tea 🍓 this lil guy lives in ./include/linux/comedi and the page is dated October 2026 — so yeah, slightly future-coded of her, but we stan a forward-thinking function. mwah 💜🧚