sdca_asoc_set_constraints(9)

📦 version 7.3.1, in nixpkgs unstable

💅 sdca_asoc_set_constraints(9)

okay so bestie, welcome to the kernel API manual, section 9 — this is sdca_asoc_set_constraints(9) and it's literally the function that constrains the channels available on a DAI 🎀

✨ NAME ✨

sdca_asoc_set_constraints — constrain channels available on a DAI

like. that's the whole job. it sets the constraints. on a DAI. slay.

🌸 SYNOPSIS 🌸

int sdca_asoc_set_constraints (struct device *dev , struct regmap
*regmap , struct sdca_function_data *function , struct snd_pcm_substream
*substream , struct snd_soc_dai *dai );

five arguments, one int return, no cap 🫶

🦋 ARGUMENTS 🦋

  • dev — Pointer to the device, used for error messages. it's giving "when things go wrong, this is who we blame (politely, in a log)" 💀
  • regmap — Pointer to the Function register map. the actual vibe source, register-style ✨
  • function — Pointer to the Function information. all the deets about the Function live here 🎀
  • substream — Pointer to the PCM substream. the PCM side of the story 🍓
  • dai — Pointer to the ASoC DAI. the DAI in question, main character energy 👑

🔥 DESCRIPTION 🔥

Typically called from startup.

that's it, that's the description — but like, it's an important typically, okay? startup is when this whole constraints thing goes down. periodt 💅

⭐ RETURN ⭐

Returns zero on success, and a negative error code on failure.

so: 0 = we ate, negative = we did not eat 😭 check ur return value besties, always.

🌈 SEE ALSO 🌈

Kernel file ./sound/soc/sdca/sdca_asoc.c — plus the whole friend group:

ngl, sdca_asoc_free_constraints(9) is the one you call when you're done constraining — set 'em, free 'em, no leaks, iykyk 🧚

and that's the page!! sourced straight from ./sound/soc/sdca, dated October 2026 — bookmark it, screenshot it, put it on ur fridge, it's iconic 💖✨

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