snd_dmaengine_pcm_trigger(9)

📦 version 7.3.1, in nixpkgs unstable

💖 snd_dmaengine_pcm_trigger(9) 💖

okay so bestie, welcome to the Kernel API Manual — this one's a lil kernel function called snd_dmaengine_pcm_trigger, and honestly? she's giving "small but mighty" energy. let's get into it 🎀

✨ NAME ✨

snd_dmaengine_pcm_trigger — the dmaengine-based PCM trigger implementation, aka the girl who handles your trigger callbacks 💅

🌸 SYNOPSIS 🌸

int snd_dmaengine_pcm_trigger (struct snd_pcm_substream *substream , int
cmd );

that's it. that's the whole signature. short queen 👑

🦋 ARGUMENTS 🦋

  • substream — the PCM substream. like, the actual stream we're messing with 💖
  • cmd — the trigger command. the vibe check of what you want done ✨

🎀 DESCRIPTION 🎀

so here's the tea ☕ — you can use this function as the PCM trigger callback for your dmaengine-based PCM driver implementations. it's literally built for that. main character energy, no cap 🫶

⭐ RETURN ⭐

she returns 0 on success bestie 🎉 and a negative error code otherwise 😭 (yeah, the classic "not zero = something went wrong" situation, iykyk).

🌈 SEE ALSO 🌈

the kernel file lives right here, iconic:

  • ./sound/core/pcm_dmaengine.c

and the whole friend group 💜:

ngl, if your driver's trigger callback was looking for a home, this function ate and left no crumbs 💅

k byeee, this page came to you straight out of ./sound/core, dated October 2026 — stay slay, keep your error codes negative, and remember: she's in the Kernel API Manual for a reason 🧚‍♀️💖✨

📦 where this page comes from