snd_dmaengi...uest_channel(9)

📦 version 7.3.1, in nixpkgs unstable

💅 snd_dmaengine_pcm_request_channel — like, the Kernel API Manual (section 9) page you didn't know you needed 🎀

okay so bestie, welcome to the <pink>Kernel API Manual</pink>, section 9 — yes it's a real section, no I will not be taking questions. this one's about grabbing yourself a DMA channel for dmaengine PCM, and honestly? it's giving tiny-but-powerful. let's go ✨

🌸 NAME 🌸

snd_dmaengine_pcm_request_channel — literally just: request a channel for the dmaengine PCM. that's the whole vibe. that's the whole function. 💖

✨ SYNOPSIS ✨

struct dma_chan * snd_dmaengine_pcm_request_channel (dma_filter_fn
filter_fn , void *filter_data );

no cap, that's the whole signature. two args, one channel struct pointer coming back at you. she's simple, she's elegant, she slays 🫶

🦋 ARGUMENTS 🦋

  • filter_fn — the filter function, bestie. it's what you use to request the DMA channel. think of it as your little matchmaker that decides which channel is the one 💅
  • filter_data — the data you pass along to that DMA filter function. it rides shotgun with filter_fn, iykyk 🎀

🌈 DESCRIPTION 🌈

okay so here's the tea: this function requests a DMA channel for usage with dmaengine PCM. that's it. that's the description. she's a one-liner and she knows it. main character energy fr fr 👑

⭐ RETURN ⭐

it hands you back NULL, or the requested DMA channel. so like... vibe check your pointer before you use it, bestie 😭💀

a NULL return is a real possibility, don't be out here dereferencing like it's guaranteed. that's not a warning the manpage gives, that's just me caring about you 🫶

👑 SEE ALSO 👑

the kernel file lives at ./sound/core/pcm_dmaengine.c — that's the source, go read it, it's iconic 💜

and the whole friend group shows up here:

like a whole squad, all (9) pages, all hanging out in ./sound/core. obsessed 🧚‍♀️

mwah 💋 that's the page! shoutout to ./sound/core for being the source location and to October 2026 for the date stamp — my little sign-off before you close the terminal. go request some channels, bestie, u got this 🌸💖✨

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