comedi_check_trigger_src(9)

💅 comedi_check_trigger_src(9) — your fave lil trigger validator

okay so this one lives in the Kernel API Manual bestie, and it's genuinely one of the chillest little helpers in the comedi-verse. no cap, it's giving "bouncer at the club checking IDs" energy 🫶

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✨ SYNOPSIS ✨

int comedi_check_trigger_src (unsigned int *src , unsigned int flags );

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🎀 ARGUMENTS 🎀

• src — pointer to the trigger source you wanna validate. like, hand it over and let it do its thing 💖
• flags — the bitmask of valid TRIG_* values for this particular trigger. this is the rulebook, the vibe check, the guest list 🌸

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💫 DESCRIPTION 💫

so bestie, picture this: you're writing a comedi driver, and you've got a do_cmdtest function, and you're on "step 1" of it. that's literally where this function lives. it's the designated bouncer for your comedi_cmd triggers 👑

it validates the comedi_cmd triggers by masking src against flags. and the reason that masking is so iconic? it lets userspace comedilib pass all the comedi_cmd triggers in as TRIG_ANY and get back a bitmask of the valid trigger sources. literally so convenient, we love a mutual exchange 🔥

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⭐ RETURN ⭐

• 0 — everything in *src is supported. slay, we're so back ✨
• -EINVAL — one or more of the trigger sources in *src is not supported. it's giving rejected at the door 💀

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🌈 SEE ALSO 🌈

okay this list is a whole friend group, buckle up:

• 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_unipolar(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_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)

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💜 ngl, if you're poking around do_cmdtest at all, you're gonna bump into the rest of these — they're all part of the same little comedi family. iykyk.

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kisses bestie, this page came from ./include/linux/comedi, dated October 2026, and yes it is literally titled comedi_check_trigger_src(9) — go forth and validate those triggers 💅🎀