apple_smc_read(9)

💖 apple_smc_read — the kernel API manual, bestie edition 💖

okay so this is apple_smc_read(9) from the Kernel API Manual, and it's literally the function that goes "hey SMC, gimme size bytes of that key, thanks bestie" and drops them into your buffer. slay. let's get into it 🫶

✨ NAME ✨

apple_smc_read — read size bytes from the given SMC key into buf. that's it, that's the whole vibe. 👑

🌸 SYNOPSIS 🌸

int apple_smc_read (struct apple_smc *smc , smc_key key , void *buf ,
size_t size );

🎀 ARGUMENTS 🎀

• smc — pointer to the struct apple_smc. this is the main character, the thing we're reading from 💅
• key — the smc_key you wanna read. pick your key, bestie 🗝️
• buf — the buffer that size bytes of data get read into from the SMC. your lil container 🍓
• size — the number of bytes to be read into buf. tell it exactly how much you want, no cap ✨

⭐ RETURN ⭐

zero on success, negative errno on error. so like — 0 is the slay outcome, and if it goes negative that's the kernel telling you "not today" 😭

🦋 SEE ALSO 🦋

the kernel file ./include/linux/mfd/macsmc.h, plus the whole friend group: smc_key(9), SMC_KEY(9), struct apple_smc_key_info(9), enum apple_smc_boot_stage(9), struct apple_smc(9), apple_smc_write(9), apple_smc_enter_atomic(9), apple_smc_write_atomic(9), apple_smc_rw(9), apple_smc_get_key_by_index(9), apple_smc_get_key_info(9), apple_smc_key_exists(9) — go read those too, iykyk 💜

anyway that's the whole page, mwah 💋 — this one lives over in ./include/linux/mfd, dated October 2026, and yes it's still called apple_smc_read(9) in case you forgot already. ily, go read some SMC keys 🧚‍♀️