snd_dmaengine_pcm_open(9)

📦 version 7.3.1, in nixpkgs unstable

💖 snd_dmaengine_pcm_open(9) 💖

okay so bestie, welcome to the Kernel API Manual ✨ — today we're opening a dmaengine-based PCM substream and honestly? it's giving main character energy in the audio pipeline 🎀

🌸 NAME 🌸

snd_dmaengine_pcm_open — open a dmaengine based PCM substream 🦋

✨ SYNOPSIS ✨

int snd_dmaengine_pcm_open (struct snd_pcm_substream *substream , struct
dma_chan *chan );

🎀 ARGUMENTS 🎀

  • substream — the PCM substream, aka the whole reason we're here 💅
  • chan — the DMA channel you're gonna use for data transfers, no cap

🧚 DESCRIPTION 🧚

so like, the function should usually be called from the pcm open callback — that's the vibe, that's the moment, that's where it belongs ⭐

⚠️ Okay this part is important bestie, listen up: this function will use the private_data field of the substream's runtime. So it is not available to your pcm driver implementation. Like, it's taken. claimed. off the market. 🙈 don't try to use it, it's not yours anymore 😭

🔥 RETURN 🔥

  • 0 on success 🎉
  • a negative error code otherwise 💀

👑 SEE ALSO 👑

Kernel file ./sound/core/pcm_dmaengine.c — go read it, iykyk 📖

like the whole friend group fr fr 🫶 go say hi to all of them 🌈

and that's the tea, bestie 🍓 this lil page lives over in ./sound/core and it's dated October 2026 — so yeah, it's from the future, slay 👑✨ bye bye, go write some bomb audio drivers 💜🎀

📦 where this page comes from