ad7944_chain_mode_alloc(9)

💅 ad7944_chain_mode_alloc — a Kernel API Manual moment

okay so bestie, welcome to the <pink>ad7944_chain_mode_alloc</pink> page ✨ this is from the Kernel API Manual, and it's literally the glow-up you need for daisy-chained devices. buckle up 🎀

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🌸 NAME 🌸

ad7944_chain_mode_alloc — allocate and initialize channel specs and buffers for daisy-chained devices 🦋

like, it makes the channel specs and the buffers, and it also sets them up. both. she does both. 👑

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✨ SYNOPSIS ✨

int ad7944_chain_mode_alloc(struct device *dev,
                            const struct iio_chan_spec *chan_template,
                            u32 n_chain_dev,
                            struct iio_chan_spec **chain_chan,
                            void **chain_mode_buf,
                            unsigned long **chain_scan_masks);

that signature is long and honestly it's giving main character energy 💅 every single pointer is doing its job, no cap.

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🫶 ARGUMENTS 🫶

• dev — the device for the devm_ functions 🧚 this is the one whose lifetime rules you're riding on, iykyk.
• chan_template — the channel template for the devices. it's an array of 2 channels: voltage and timestamp. that's the blueprint, bestie, don't lose it 💖
• n_chain_dev — the number of devices in the chain. yes, the whole little chain 🌈 count them properly, fr fr.
• chain_chan — pointer to receive the allocated channel specs. it's an out-param, so she gets filled in for you 👀
• chain_mode_buf — pointer to receive the allocated rx buffer. also an out-param. also getting filled in 🍓
• chain_scan_masks — pointer to receive the allocated scan masks. yep, third out-param, still slaying 🎀

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⭐ RETURN ⭐

0 on success 🎉 and a negative error code on failure 😭 (if it's negative, it's not a vibe — check it, please and thank you).

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👑 SEE ALSO 👑

• Kernel file ./drivers/iio/adc/ad7944.c — literally the source, go read her 💜
• ad7944_convert_and_acquire(9) — the related manual page, highly recommend 🦋

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quick vibe check: the out-params (chain_chan, chain_mode_buf, chain_scan_masks) are pointers to receive the allocated things — so don't pass garbage and then act surprised. 🙈

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and that's the whole page, bestie 💖 this little gem lives under ./drivers/iio/adc and it's dated October 2026 — from the Kernel API Manual, no less. go forth and daisy-chain responsibly 🌸💅✨