mmc_regulato...age_notifier(9)

💅 mmc_regulato...age_notifier(9) — like, the whole glow-up ✨

okay so bestie, welcome to the Kernel API Manual 🎀 this one's a lil function with a very long name and a very short job description, and honestly? she's iconic for that. let's get into it 🫶

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✨ NAME ✨

mmc_regulator_register_undervoltage_notifier — bestie, this is how you register for undervoltage events 💀 like it literally says it in the name, no cap.

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🌸 SYNOPSIS 🌸

void mmc_regulator_register_undervoltage_notifier (struct mmc_host *host);

that's it. that's the whole vibe check. one function, one argument, returns nothing (void, she gives nothing and takes nothing 💅).

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🦋 ARGUMENTS 🦋

• host — the MMC host 🫶 that's the whole description, she's a woman of few words and we respect it.

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✨ DESCRIPTION ✨

okay so here's the tea ☕ — this one gets called by a bus driver when a card that supports graceful shutdown gets attached. that's the entire situation. bus driver sees a graceful-shutdown-capable card slide in, hits up this function, done. main character energy only 🌈

no extra lore given, bestie — the manpage keeps it mysterious 🙈

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👑 SEE ALSO 👑

lowkey the best part, because there's a whole friend group here 🥰 all of these live in the kernel file ./drivers/mmc/core/regulator.c — go say hi:

• mmc_ocrbitnum_to_vdd(9)
• mmc_regulator_get_ocrmask(9)
• mmc_regulator_set_ocr(9)
• mmc_regulator_set_vqmmc(9)
• mmc_regulator_set_vqmmc2(9)
• mmc_regulator_unregister_undervoltage_notifier(9) — yes, the un-register twin, she exists 💜
• mmc_regulator_get_supply(9)
• mmc_regulator_enable_vqmmc(9)
• mmc_regulator_disable_vqmmc(9)

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and that's a wrap, bestie 🎀 this lil page came straight out of ./drivers/mmc/core and it's dated October 2026 — slay, periodt, go read the regulator source if you want the full story 💖✨