STRUCT INV_ICM45600_FIFO(9)

💅 struct inv_icm45600_fifo(9) — from the Kernel API Manual, bestie 🎀

okay so picture this: you're deep in the kernel, you cracked open struct inv_icm45600_fifo, and you're like "what even is all this" — bestie, same. this is the FIFO state variables struct, and honestly? she's iconic. let's go member by member, no cap, nothing skipped. ✨

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🌸 NAME

struct inv_icm45600_fifo — the FIFO state variables. that's the whole vibe. that's the gig. 💖

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🦋 SYNOPSIS

struct inv_icm45600_fifo {
    unsigned int on;
    unsigned int en;
    u32 period;
    struct {
      unsigned int gyro;
      unsigned int accel;
      unsigned int eff_gyro;
      unsigned int eff_accel;
    } watermark;
    size_t count;
    struct {
      size_t gyro;
      size_t accel;
      size_t total;
    } nb;
    u8 *data;
 };

look at her. gorgeous. every field accounted for, not one dropped, and we're about to go through all of them. 🫶

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👑 Members

the top-level girlies

• on — the reference counter for FIFO on. think of it like a little tally of how many things are currently like "yeah the FIFO is ON". 📈
• en — a bits field of INV_ICM45600_SENSOR_* for the FIFO EN bits. literally just the enable bits, chillin' in a bitfield. 🔥
• period — the FIFO internal period. that's her timing, that's her rhythm. ⏳
• watermark — the watermark configuration values for accel and gyro. yes she has sub-fields, we'll get to those, patience bestie 💅
• count — number of bytes in the FIFO data buffer. just a count. a byte count. keepin' it real. 🍓
• nb — the gyro, accel and total samples in the FIFO data buffer. again: sub-fields. coming right up. 👀
• data — the FIFO data buffer, aligned for DMA (8kB). that's the big one, the main character, the actual payload. ⭐

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🧚 inside watermark (yes, she has layers)

• watermark.gyro — the requested watermark for gyro. what you asked for. 🙈
• watermark.accel — the requested watermark for accel. again: what you asked for. 🙈
• watermark.eff_gyro — the effective watermark for gyro. what actually ended up happening. 💀
• watermark.eff_accel — the effective watermark for accel. ditto, but for accel. 😭

ngl the requested-vs-effective split is giving "me vs the me that actually shows up" and honestly? relatable. keep both in your head, they are not the same thing. ✨

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🌈 inside nb

• nb.gyro — gyro samples in the FIFO data buffer. 🌀
• nb.accel — accel samples in the FIFO data buffer. 🏃‍♀️
• nb.total — total samples in the FIFO data buffer. the sum, the whole squad. 👯‍♀️

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💜 SEE ALSO

• Kernel file ./drivers/iio/imu/inv_icm45600/inv_icm45600_buffer.h — go read her, she's right there, iykyk 📖

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okay that's the whole page, nothing left out, we ate and left no crumbs 🍽️✨

this came to you from ./drivers/iio/imu/inv_icm45600, dated October 2026, and the page itself is struct inv_icm45600_fifo(9). mwah, ily, go write some buffer code bestie 💖🎀🦋