mma9551_read_config_words(9)

📦 version 7.3.1, in nixpkgs unstable

💅 mma9551_read_config_words(9) — like, the official kernel API manual bestie ✨

okay so real talk, this one's from the Kernel API Manual and it's giving "I read multiple config words and I'm not sorry about it" 🎀

🌸 NAME 🌸

mma9551_read_config_words — read multiple config words 🦋

✨ SYNOPSIS ✨

int mma9551_read_config_words (struct i2c_client *client , u8 app_id ,
       u16 reg , u8 len , u16 *buf );

🫶 ARGUMENTS 🫶

  • client — your I2C client, the whole reason we're here 💖
  • app_id — the Application ID, yes it matters, don't skip it bestie
  • reg — the Application register, the exact one you're trying to vibe with
  • len — length of the array you want to read, and it's measured in words 🔥
  • buf — the array of words that gets read into, main character energy only 👑

👑 DESCRIPTION 👑

so this is the one that reads multiple configuration registers — and yeah, we mean word-sized registers, not the little byte ones 🌈

⚠️ Locking note, and this is important so listen up: this function must be called with the device lock held. Locking is not handled inside the function — like, at all. Callers gotta make sure they serialize access to the HW themselves, fr fr. no cap, that's on you 💀

🎀 RETURN 🎀

  • 0 on success, slay 💅
  • a negative value on failure 😭

💜 SEE ALSO 💜

the kernel file where this lives:

  • ./drivers/iio/accel/mma9551_core.c

and the whole friend group of related functions, all of them, no gatekeeping:

aaaand that's the whole page 🧚💖 this came from ./drivers/iio/accel, dated October 2026 — iconic, timestamped, and archived in the group chat forever ⭐🌸🦋

📦 where this page comes from