pcm_open(9)

pcm_open(9) 💅

okay so this is pcm_open(9) from the Kernel API Manual, and we're gonna get you comfy with it 💖

🎀 NAME 🎀

pcm_open — implements open callback function for PCM middle layer. That's the whole name situation, bestie.

✨ SYNOPSIS ✨

int pcm_open (struct snd_pcm_substream *substream );

🫶 ARGUMENTS 🫶

• substream — pointer to ALSA PCM substream. That's it, one pointer, main character energy.

💖 DESCRIPTION 💖

This is called when a PCM substream is opened. At least, the function should initialize the runtime->hw record — don't skip that part, it's literally the minimum.

Returns 0 on success or error code otherwise. Periodt.

🦋 SEE ALSO 🦋

the whole squad, no skips:

• Kernel file ./drivers/most/most_snd.c
• struct channel(9)
• get_channel(9)
• copy_data(9)
• playback_thread(9)
• pcm_close(9)
• pcm_prepare(9)
• pcm_trigger(9)
• pcm_pointer(9)
• audio_probe_channel(9)
• audio_disconnect_channel(9)
• audio_rx_completion(9)
• audio_tx_completion(9)

xoxo, your Unix bestie 🫶 — source/version: ./drivers/most, date: October 2026 💜