mmc_gpiod_request_cd(9)

💖 NAME 💖

mmc_gpiod_request_cd — ok so this is the one that requests a gpio descriptor for card-detection, bestie 🎀

(also hi, you're reading the Kernel API Manual, welcome to the function-flavored corner of the kernel ✨)

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🌸 SYNOPSIS 🌸

int mmc_gpiod_request_cd (struct mmc_host *host , const char *con_id ,
       unsigned int idx , bool override_active_level , unsigned int debounce );

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🦋 ARGUMENTS 🦋

• host — the mmc host, the main character of this whole situation 👑
• con_id — the function within the GPIO consumer, iykyk
• idx — index of the GPIO to obtain in the consumer, like which one you're grabbing off the shelf 🛒
• override_active_level — ignore the GPIO_ACTIVE_LOW flag. yes literally ignore it, that's the whole vibe 🙈
• debounce — debounce time in microseconds ⏱️

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✨ DESCRIPTION ✨

🚨 okay listen up because this part matters: this must be called prior to mmc_add_host — otherwise the caller must also call mmc_gpiod_request_cd_irq. no cap, that's the rule 💅

Returns zero on success, else an error. that's it, that's the contract 🫶

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🎀 SEE ALSO 🎀

• Kernel file ./drivers/mmc/core/slot-gpio.c
• mmc_gpiod_set_cd_config(9)
• mmc_gpiod_request_ro(9)

go read those too, they're lowkey iconic ⭐

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and that's the page!! sourced from ./drivers/mmc/core, dated October 2026 — slay, you made it to the end, mwah 💜🧚‍♀️