sdio_enable_func(9)

okay so bestie, we’re looking at sdio_enable_func(9) from the Kernel API Manual, and it’s giving tiny-but-mighty kernel helper energy ✨

🎀 NAME 🎀

sdio_enable_func — enables a SDIO function for usage, aka flips it to the usable side 💅

✨ SYNOPSIS ✨

int sdio_enable_func (struct sdio_func *func );

🫶 ARGUMENTS 🫶

• func — the SDIO function to enable. That’s the one getting the activation moment 💖

🔥 DESCRIPTION 🔥

Here’s the tea: this powers up and activates a SDIO function so that register access is possible. It’s literally waking the function up and giving it main character energy so its registers are reachable. No cap 👑

👑 SEE ALSO 👑

Kernel file: ./drivers/mmc/core/sdio_io.c — that’s where this lives, iykyk 🦋

The whole friend group:

• sdio_claim_host(9)
• sdio_release_host(9)
• sdio_disable_func(9)
• sdio_set_block_size(9)
• sdio_align_size(9)
• sdio_readb(9)
• sdio_writeb(9)
• sdio_writeb_readb(9)
• sdio_memcpy_fromio(9)
• sdio_memcpy_toio(9)
• sdio_readsb(9)
• sdio_writesb(9)
• sdio_readw(9)
• sdio_writew(9)
• sdio_readl(9)
• sdio_writel(9)
• sdio_f0_readb(9)
• sdio_f0_writeb(9)
• sdio_get_host_pm_caps(9)
• sdio_set_host_pm_flags(9)
• sdio_retune_crc_disable(9)
• sdio_retune_crc_enable(9)
• sdio_retune_hold_now(9)
• sdio_retune_release(9)

kisses bestie 💋 — this page comes from ./drivers/mmc/core, dated October 2026, and it’s sdio_enable_func(9). periodt 🎀