STRUCT ADIS(9)

💖 struct adis(9) 💖

okay so welcome to the struct adis manpage, section 9 of the Kernel API Manual — this is the one that defines what a little ADIS device instance actually is on the inside 🫶 it lives in the kernel, it's giving "one struct to hold the whole vibe", and honestly the way it just… holds everything? iconic.

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✨ NAME ✨

struct adis — the device instance data for an ADIS device. like, the whole little bundle of state. no cap.

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🌸 SYNOPSIS 🌸

struct adis {
    struct spi_device       *spi;
    struct iio_trigger      *trig;
    const struct adis_data  *data;
    unsigned int            burst_extra_len;
    const struct adis_ops   *ops;
    struct mutex            state_lock;
    struct spi_message      msg;
    struct spi_transfer     *xfer;
    unsigned int            current_page;
    unsigned long           irq_flag;
    void *buffer;
    u8 tx[10];
    u8 rx[4];
 };

literally just copy it exactly like that, bestie — the field order and the types are the whole point 💅

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🎀 Members 🎀

okay so this is the part where we go field by field, and every single one of them matters:

• spi — reference to the SPI device that owns this ADIS IIO device. the main character of the ownership situation fr.
• trig — the IIO trigger object data. 🦋
• data — the ADIS chip variant specific data. every chip's own personal lore.
• burst_extra_len — the burst extra length. ⚠️ heads up: this one should only be used by devices that can dynamically change their burst mode length. so if yours can't, hands off please 🙈
• ops — the ops struct for custom read and write functions. you want your own read/write behaviour? this is where you put it.
• state_lock — the lock the device uses to protect state. mutual exclusion slay 🔥
• msg — the SPI message object. yes, the actual message, not a text 💀
• xfer — the SPI transfer objects that get used for a msg. plural, bestie, it's a pointer.
• current_page — some ADIS devices have registers, and this selects the current page. iykyk 📄
• irq_flag — the IRQ handling flags, as passed to request_irq. keep them exactly as they went in.
• buffer — the data buffer for information read from the device. 🍓
• tx — DMA safe TX buffer for SPI transfers. DMA safe is not a suggestion, it's a lifestyle ✨
• rx — DMA safe RX buffer for SPI transfers. same energy, other direction 🧚

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👑 SEE ALSO 👑

Kernel file ./include/linux/iio/imu/adis.h, plus all of these cuties:

• struct adis_data(9)
• struct adis_ops(9)
• adis_reset(9)
• __adis_write_reg_8(9)
• __adis_write_reg_16(9)
• __adis_write_reg_32(9)
• __adis_read_reg_16(9)
• __adis_read_reg_32(9)
• adis_write_reg(9)
• adis_read_reg(9)
• adis_write_reg_8(9)
• adis_write_reg_16(9)
• adis_write_reg_32(9)
• adis_read_reg_16(9)
• adis_read_reg_32(9)
• adis_update_bits_base(9)
• adis_update_bits(9)

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aaaand that's the page 🌈 mwah 💋 this one ships out of ./include/linux/iio/imu, dated October 2026 — go read the other ones too, they're lowkey obsessed with this struct, and honestly? valid. 🫶💜