snd_ctl_add_follower(9)

snd_ctl_add_follower(9) 💖

Hiii bestie! Welcome to the Kernel API Manual entry for snd_ctl_add_follower — this is where we add a virtual follower control to a vmaster, and it's lowkey iconic. ✨🎀

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🌸 NAME 🌸

snd_ctl_add_follower — add a virtual follower control 💅

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✨ SYNOPSIS ✨

int snd_ctl_add_follower (struct snd_kcontrol *master , struct snd_kcontrol *follower );

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🎀 ARGUMENTS 🎀

• master — vmaster element 👑
• follower — follower element to add 🦋

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🦋 DESCRIPTION 🦋

Okay so picture this: you're adding a virtual follower control to the given master element — and that master element has to have been created via snd_ctl_create_virtual_master beforehand. No cap. 💖

All followers must be the same type, meaning they return the same information via the info callback. The function doesn't check it, so it's your responsibility. iykyk 😭💀

🚨 Bestie, that's a real caveat — same type or it's on you. The function is literally not checking.

Also, some additional limitations:

• at most two channels
• logarithmic volume control (dB level) thus no linear volume
• master can only attenuate the volume without gain

That's the whole vibe check — no linear volume, no gain, just attenuation. 🫶✨

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👑 RETURN 👑

Zero if successful or a negative error code. Slay when it's zero, cry when it's negative. 💖😭

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🔥 SEE ALSO 🔥

• Kernel file ./include/sound/control.h — snd_ctl_find_id_mixer(9), snd_ctl_add_follower_uncached(9) 👀✨

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That's the whole page, bestie. Signed off from ./include/sound, October 2026 — mwah 💋🎀