snd_register_device(9)

✨ snd_register_device(9) ✨

okay bestie, welcome to the Kernel API Manual — today's main character is snd_register_device, and honestly? she's kind of a big deal. she's the one who actually puts your ALSA device file out there into the world so people can open it. 🎀

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🌸 NAME 🌸

snd_register_device — register the ALSA device file for the card 💅

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🦋 SYNOPSIS 🦋

int snd_register_device (int type , struct snd_card *card , int dev ,
       const struct file_operations *f_ops , void *private_data , struct device
       *device );

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💖 ARGUMENTS 💖

• type — the device type, and it's one of those SNDRV_DEVICE_TYPE_XXX values. iykyk 👑
• card — the card instance. yes, the card. the whole vibe. 🃏
• dev — the device index, like which one of them this is
• f_ops — the file operations, AKA the whole personality of the file
• private_data — user pointer for f_ops->open, so your open callback knows what's up 🫶
• device — the device to register. that's it, that's the one ✨

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🧚 DESCRIPTION 🧚

so what does she actually do? she registers an ALSA device file for the given card. simple as that. 💫

the operators have to be set in the reg parameter — no cap, that's a requirement, not a suggestion. 🙈

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⭐ RETURN ⭐

zero if successful, or a negative error code on failure. that's the whole vibe check: 0 = slay, negative = 😭 💀

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🔥 SEE ALSO 🔥

• Kernel file ./sound/core/sound.c
• snd_request_card(9)
• snd_lookup_minor_data(9)
• snd_unregister_device(9)

all of these are lowkey her besties, go say hi 🫶

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mwah 💜 that's a wrap! this page lives in ./sound/core, and it's dated October 2026 — bookmark it, screenshot it, tattoo it, whatever. periodt. 🌈✨