mma9551_read_config_word(9)

📦 version 7.3.1, in nixpkgs unstable

💖 mma9551_read_config_word — Kernel API Manual vibes ✨

okay so bestie, welcome to the mma9551_read_config_word(9) era 🎀 this is a lil page from the Kernel API Manual and honestly? it's giving "tiny function, big responsibility" energy. Let's get into it 💅

✨ NAME ✨

mma9551_read_config_word — read 1 config word 🫶

like, one (1) word. a whole single config word. iconic minimalism, no cap ✨

🌸 SYNOPSIS 🌸

int mma9551_read_config_word (struct i2c_client *client , u8 app_id ,
u16 reg , u16 *val );

look at her go 😭 four lil params, one int coming back atcha 💖

🦋 ARGUMENTS 🦋

  • client — the I2C client, aka the device we're chatting with 🫶
  • app_id — the Application ID, your little "which app are we in" badge 🎀
  • reg — the Application register, the exact spot we're reading from ✨
  • val — pointer to store the value that got read, so you actually get to keep the tea 🍓

💜 DESCRIPTION 💜

So what she does: she reads one configuration word from the device, using the MMA955xL command format 🔥

And here's the whole vibe of that format, bestie — commands to the MMA955xL platform are literally a write followed by one or more reads. that's it, that's the protocol 💅

⚠️ Locking note, and this one is serious, ngl: this function must be called with the device lock held. Locking is not handled inside the function. Callers should ensure they serialize access to the HW. no lock, no love, fr fr 😭

like she will not lock things for you. she is not your mom. you bring the lock 🔒💖

⭐ RETURN ⭐

  • 0 on success — slay 🎉
  • negative value on failure — not slay, but informative 💀

🌈 SEE ALSO 🌈

Kernel file: ./drivers/iio/accel/mma9551_core.c 👑

and the whole friend group, aka the rest of the mma9551 crew:

aaaand that's the page, bestie 🧚 this lil doc lives in ./drivers/iio/accel, dated October 2026 — consider this your cute lil sign-off, mwah 💋💖✨

📦 where this page comes from