cs_dsp_coeff_read_ctrl(9)

📦 version 7.3.1, in nixpkgs unstable

💅 cs_dsp_coeff_read_ctrl — a Kernel API Manual moment

okay so bestie, welcome to the cs_dsp_coeff_read_ctrl(9) page 💖 this one lives in the Kernel API Manual and honestly? it's a little read-only icon. it takes the coefficient control you point at and reads it straight into your buffer. no cap, that's the whole vibe.

✨ NAME ✨

cs_dsp_coeff_read_ctrl — Reads the given coefficient control into the given buffer 🎀

🌸 SYNOPSIS 🌸

int cs_dsp_coeff_read_ctrl (struct cs_dsp_coeff_ctl *ctl , unsigned int
off , void *buf , size_t len );

like, that's the whole signature, she's not complicated 🦋

🫶 ARGUMENTS 🫶

  • ctl — pointer to coefficient control. this is your main character, the control we're reading from 👑
  • off — word offset at which data should be read. yes, word offset, not byte, read carefully ngl
  • buf — the buffer to store to the given control. this is where the good stuff lands 🍓
  • len — the length of the buffer in bytes. (bytes here, bestie, keep your units straight 😭)

💜 DESCRIPTION 💜

Must be called with pwr_lock held.

⚠️ okay this is the important bit — pwr_lock has to be held when you call this. not optional, not a suggestion, it's literally in the description. lock first, then read, iykyk 🔥

⭐ RETURN ⭐

Zero for success, a negative number on error.

like, 0 = slay, negative = something's giving "nope" 💀

🌈 SEE ALSO 🌈

the kernel file lives right here: ./drivers/firmware/cirrus/cs_dsp.c

and here's the whole friend group, fr fr — go say hi to all of them:

and that's the page, bestie!! 🌟 big sign-off energy: this one comes from ./drivers/firmware/cirrus and it's dated October 2026 — so yeah, she's from the future, and she's still out here reading coefficients into buffers 💅✨🎀

📦 where this page comes from