snd_hda_ctl_add(9)

📦 version 7.3.1, in nixpkgs unstable

okay bestie, welcome to snd_hda_ctl_add(9) from the Kernel API Manual — this is the page for adding a control element and assigning it to the codec, and it's giving "small function, very important cleanup energy" 💖

✨ NAME ✨

snd_hda_ctl_add — add a control element and assign it to the codec. That's the mission, periodt.

🌸 SYNOPSIS 🌸

int snd_hda_ctl_add (struct hda_codec *codec , hda_nid_t nid , struct
       snd_kcontrol *kctl );

🎀 ARGUMENTS 🎀

  • codec — the HD-audio codec, aka the main character here.
  • nid — the corresponding NID, and it's optional — yes bestie, optional.
  • kctl — the control element you're assigning.

🌈 DESCRIPTION 🌈

Okay so the whole vibe: this function adds the given control element to an array inside the codec instance. Every control element that belongs to a codec is supposed to be added through this function, so that a proper clean-up actually works at free or reconfiguration time. no skipping the system, bestie 😭

If a non-zero nid is passed, that NID gets assigned to the control element. The assignment is shown in the codec proc file.

snd_hda_ctl_add checks the control subdev id field to see whether the #HDA_SUBDEV_NID_FLAG bit is set. If it is set — and nid is zero — then the lower bits value is taken as the NID to assign. The #HDA_NID_ITEM_AMP bit specifies whether kctl->private_value is a HDA amplifier value. lowkey clever, ngl 💅

🦋 SEE ALSO 🦋

Kernel file: ./sound/hda/common/codec.c — literally the spot, bestie 🫶

xoxo, this page's source/version is ./sound/hda/common, dated October 2026 — mwah, bye bestie 🫶💅✨

📦 where this page comes from