iosf_mbi_bl...t_i2c_access(9)

📦 version 7.3.1, in nixpkgs unstable

💅 iosf_mbi_block_punit_i2c_access(9) — from the Kernel API Manual, bestie ✨

okay so real talk, this one is a function from the Kernel API Manual and it's literally the bouncer for a shared bus. let's get into it 🫶

✨ NAME ✨

iosf_mbi_block_punit_i2c_access — blocks P-Unit accesses to the PMIC bus, no cap 🚫🚌

🌸 SYNOPSIS 🌸

int iosf_mbi_block_punit_i2c_access (void );

🎀 ARGUMENTS 🎀

  • void — no arguments. nothing. zero. empty set. she takes nothing and she delivers 💅

🦋 DESCRIPTION 🦋

call this function to block P-Unit access to the PMIC I2C bus, so that the kernel can safely access the PMIC over the shared I2C bus. it's giving "excuse me, we need the room" energy 🙈

this function acquires the P-Unit bus semaphore and notifies pmic_bus_access_notifier listeners that they may no longer access the P-Unit in a way which may cause it to access the shared I2C bus. so it's like, two things at once — semaphore acquired, besties notified. iconic. 👑

note this function may be called multiple times and the bus will not be released until iosf_mbi_unblock_punit_i2c_access has been called the same amount of times. so like, it's counting. keep track fr fr 🔥

⭐ RETURN ⭐

nonzero on error 😭 — so 0 means you're chilling, anything else means something went sideways.

🌈 SEE ALSO 🌈

kernel file ./arch/x86/include/asm/iosf_mbi.h and its whole friend group:

that's the whole vibe bestie 🧚💖 this one lives in ./arch/x86/include/asm and the page is dated October 2026 — go read the header file, iykyk 💜

mwah 💋 slay safely out there, and remember: every block needs its unblock 🫶✨
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