mma9551_update_config_bits(9)

📦 version 7.3.1, in nixpkgs unstable

💅 mma9551_update_config_bits(9) — from the Kernel API Manual, bestie 🎀

okay so picture this: it's a kernel API manual page, it's section 9, and it's literally all about updating bits in a register. yes ma'am, we're in the driver-zone today ✨

🌸 NAME 🌸

mma9551_update_config_bits — update bits in register. that's it, that's the whole vibe. she does one thing and she does it well 💖

✨ SYNOPSIS ✨

int mma9551_update_config_bits(struct i2c_client *client, u8 app_id,
                               u16 reg, u8 mask, u8 val);

look at her. iconic signature, no notes 🫶

🦋 ARGUMENTS 🦋

  • client — the I2C client. your device bestie, basically 💫
  • app_id — the Application ID. which app we're talking to 🎀
  • reg — the Application register. the little spot we're poking at 👑
  • mask — mask for the bits to update. tells us which bits are the main characters 🌟
  • val — value of the bits to update. what those bits are gonna be, periodt 💅

🔥 DESCRIPTION 🔥

so what she does is: update bits in the given register using a bit mask. that's the whole move. surgical, precise, ate 💀✨

⚠️ Locking note, and this is NOT a drill: this function must be called with the device lock held. locking is not handled inside the function — she's not doing that labor for you, bestie 😭 callers should ensure they serialize access to the HW.

lowkey this is the most important part of the whole page ngl. no lock = chaos, and nobody wants chaos in the hardware layer 🙈

🌈 RETURN 🌈

  • 0 on success — slay 🎉
  • negative value on failure — not slay, handle it 😭

💜 SEE ALSO 💜

kernel file: ./drivers/iio/accel/mma9551_core.c — that's where she lives, go visit 🏠

and her whole friend group, fr fr:

🫶 ok that's the page!! sourced straight from ./drivers/iio/accel, dated October 2026, in the Kernel API Manual, section 9. go forth and hold that lock, bestie — ily, bye 💖🎀✨
📦 where this page comes from