mma9551_set_power_state(9)

📦 version 7.3.1, in nixpkgs unstable

💅 mma9551_set_power_state — a kernel API manual moment

okay so bestie, we're literally in the Kernel API Manual today and the main character is mma9551_set_power_state. yes it's a function. yes it's about power. yes we're gonna get into it. 🫶

✨ NAME ✨

mma9551_set_power_state — sets runtime PM state

like, it sets the runtime PM state. that's the whole vibe. no cap.

🌸 SYNOPSIS 🌸

int mma9551_set_power_state (struct i2c_client *client , bool on );

that return type is int btw, and it takes two things: an I2C client and a boolean. we love a two-argument icon.

🎀 ARGUMENTS 🎀

  • client — the I2C client. that's the device we're talking to, she's the main character here 💖
  • on — pass true to power the device on, pass false to power it off. literally just on/off bestie, you got this ⭐

🦋 DESCRIPTION 🦋

Resume or suspend the device using Runtime PM. the way it just... resumes or suspends. iconic behaviour honestly.

and here's the little detail everyone forgets: the device will suspend after the autosuspend delay. so like, it doesn't yeet itself into suspend instantly, it waits out the delay first. don't @ me, that's just what the manpage says 🙈

🔥 RETURN 🔥

  • 0 on success 🎉
  • a negative value on failure 😭

that's it. zero is the good one. negative means something went sideways. vibe check accordingly.

👑 SEE ALSO 👑

the kernel file lives right here, go peek:

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

and the whole friend group, all of these:

seriously, read them all, they're all slay 💜

kudos to ./drivers/iio/accel for being the source — dated October 2026, no cap 🌈✨

that's the page bestie, go forth and manage your runtime power state responsibly 💅🌸

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