IIO_DECLARE_QUATERNION(9)

💅 IIO_DECLARE_QUATERNION 💅

okay bestie, welcome to the kernel API manual — this one is IIO_DECLARE_QUATERNION, and it's honestly a little icon of a macro. it lives in the IIO corner of the kernel and it's here to make your structs look correct. let's go 🫶

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✨ SYNOPSIS ✨

IIO_DECLARE_QUATERNION (type , name );

like, that's it. two args, one macro, zero drama. 💅

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🎀 ARGUMENTS 🎀

• type — the element type of the individual vectors. yeah, the individual ones — this macro is built out of vectors, so you tell it what each of those little guys is made of. 🧚
• name — the identifier name. literally just what you wanna call the thing. your struct member's whole identity, no cap. ✨

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🌸 DESCRIPTION 🌸

okay so, a quaternion? it's a vector composed of 4 elements: W, X, Y, Z. all four, together, as a unit. 💖

use this macro to declare a quaternion element in a struct — that's the whole job, that's the assignment — and it makes sure you get proper alignment in an IIO buffer. the way that alignment matters is genuinely not a joke, so pls don't hand-roll this one, bestie. 🔥

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🦋 SEE ALSO 🦋

this is the part where the page goes full main-character and name-drops, like, the entire friend group. no gatekeeping here, iykyk 👑

kernel file ./include/linux/iio/iio.h

• struct iio_chan_spec_ext_info(9)
• struct iio_enum(9)
• IIO_ENUM(9)
• IIO_ENUM_AVAILABLE(9)
• struct iio_mount_matrix(9)
• IIO_MOUNT_MATRIX(9)
• struct iio_event_spec(9)
• IIO_SCAN_FORMAT_SIGNED_INT(9)
• IIO_SCAN_FORMAT_UNSIGNED_INT(9)
• IIO_SCAN_FORMAT_FLOAT(9)
• struct iio_scan_type(9)
• struct iio_chan_spec(9)
• iio_channel_has_info(9)
• iio_channel_has_available(9)
• struct iio_info(9)
• struct iio_buffer_setup_ops(9)
• struct iio_dev(9)
• iio_device_register(9)
• devm_iio_device_register(9)
• iio_device_claim_direct(9)
• iio_device_release_direct(9)
• iio_device_try_claim_buffer_mode(9)
• iio_device_release_buffer_mode(9)
• IIO_DEV_ACQUIRE_DIRECT_MODE(9)
• IIO_DEV_ACQUIRE_FAILED(9)
• IIO_DEV_GUARD_CURRENT_MODE(9)
• iio_device_put(9)
• dev_to_iio_dev(9)
• iio_device_get(9)
• iio_device_set_parent(9)
• iio_device_set_drvdata(9)
• iio_device_get_drvdata(9)
• IIO_DECLARE_BUFFER_WITH_TS(9)
• IIO_DECLARE_DMA_BUFFER_WITH_TS(9)
• iio_get_debugfs_dentry(9)
• iio_device_suspend_triggering(9)
• iio_device_resume_triggering(9)
• iio_get_current_scan_type(9)
• iio_get_masklength(9)
• iio_for_each_active_channel(9)
• IIO_DEGREE_TO_RAD(9)
• IIO_RAD_TO_DEGREE(9)
• IIO_G_TO_M_S_2(9)
• IIO_M_S_2_TO_G(9)

like i said. the whole group chat. 💀

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fr fr the only thing you actually have to remember: 4 elements, W X Y Z, declared in a struct, aligned properly in an IIO buffer. slay that and you're done. 🌈

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and that's the page, bestie! this one came out of ./include/linux/iio, dated October 2026 — so go forth, declare your quaternions, and remember who told you about the alignment. periodt. 👑💜