STRUCT KX022A_CHIP_INFO(9)

🎀 struct kx022a_chip_info(9) 🎀

okay bestie, so this is a page from the Kernel API Manual, section 9, and it's literally all about struct kx022a_chip_info — the little vibe-check struct that holds chip specific information for Kionix accelerometers. ngl it's giving "backend lore that makes the driver actually work" ✨

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✨ NAME ✨

struct kx022a_chip_info — Kionix accelerometer chip specific information 💅

So basically: every Kionix accelerometer has its own little personality (registers, scaling, channels), and this struct is where all that per-chip intel lives. Obsessed.

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🌸 SYNOPSIS 🌸

struct kx022a_chip_info {
    const char *name;
    const struct regmap_config *regmap_config;
    const int (*scale_table)[2];
    const int scale_table_size;
    const struct iio_chan_spec *channels;
    unsigned int num_channels;
    unsigned int fifo_length;
    u16 buf_smp_lvl_mask;
    u8 who;
    u8 id;
    u8 cntl;
    u8 cntl2;
    u8 odcntl;
    u8 buf_cntl1;
    u8 buf_cntl2;
    u8 buf_clear;
    u8 buf_status1;
    u8 buf_read;
    u8 inc1;
    u8 inc4;
    u8 inc5;
    u8 inc6;
    u8 xout_l;
    int (*get_fifo_bytes_available)(struct kx022a_data *);
};

look at all those fields, main character energy fr fr 👑

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🌈 Members 🌈

okay so here's the whole cast, one by one, no cap:

• name — name of the device 🏷️
• regmap_config — pointer to register map configuration
• scale_table — An array of tables of scaling factors for a supported acceleration measurement range. Each table contains a single scaling factor consisting of two integers. The first value in a table is the integer part, and the second value is the fractional part as parts per billion. so like... integer part, then the ppb fractional part. cute, precise, iconic 💖
• scale_table_size — Amount of values in tables. (yep, count 'em)
• channels — pointer to iio_chan_spec array
• num_channels — number of iio_chan_spec channels
• fifo_length — number of 16-bit samples in a full buffer
• buf_smp_lvl_mask — buffer sample level mask
• who — WHO_AM_I register 👀 (yes it's literally called that, we love a self-aware register)
• id — WHO_AM_I register value
• cntl — control register 1
• cntl2 — control register 2
• odcntl — output data control register
• buf_cntl1 — buffer control register 1
• buf_cntl2 — buffer control register 2
• buf_clear — buffer clear register
• buf_status1 — buffer status register 1
• buf_read — buffer read register
• inc1 — interrupt control register 1
• inc4 — interrupt control register 4
• inc5 — interrupt control register 5
• inc6 — interrupt control register 6
• xout_l — x-axis output least significant byte
• get_fifo_bytes_available — function pointer to get amount of acceleration data bytes currently stored in the sensor's FIFO buffer 🫶

lowkey the best part? it's all const-friendly and per-chip, so the driver just picks the right struct and slays. no runtime guessing, no mess. periodt.

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🦋 SEE ALSO 🦋

Kernel file ./drivers/iio/accel/kionix-kx022a.h — go read it, iykyk 💜

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and that's the whole page bestie 💅 this gem lives in ./drivers/iio/accel, dated October 2026, and it's filed under struct kx022a_chip_info(9) — go forth and read registers responsibly 🎀✨🌸