tpm_cr50_i2c_read(9)

📦 version 7.3.1, in nixpkgs unstable

💅 NAME 💅

okay so bestie, this one is tpm_cr50_i2c_read — it's the "Read from TPM register." girlie. that's the whole vibe. it reads. from a TPM. register. periodt ✨

(this is from the Kernel API Manual, section 9, if you were wondering where we're at 🎀)

🌈 SYNOPSIS 🌈

int tpm_cr50_i2c_read (struct tpm_chip *chip , u8 addr , u8 *buffer ,
       size_t len );

look at her. four arguments, one int return, zero drama 💅

🦋 ARGUMENTS 🦋

  • chip — a TPM chip. literally just the chip we're working with, she's the main character here 👑
  • addr — the register address to read from. like, which register, bestie. you gotta say 📍
  • buffer — the read destination, provided by caller. so you bring the bucket, the function just fills it 🪣
  • len — number of bytes to read. don't be shy, tell her how many 💫

🌸 DESCRIPTION 🌸

okay so here's the little routine she does, step by step, no cap:

  1. sends the register address byte to the TPM ✨
  2. then waits until the TPM is ready — either via interrupt signal or timeout expiration (whichever comes first, it's giving patient queen energy) ⏳
  3. then len bytes are read from the TPM response into the provided buffer 💖

that's it. that's the whole flow. simple, iconic, does exactly what it says 🫶

⭐ RETURN ⭐

  • 0 — Success. we ate. 🎉
  • -errno — a POSIX error code. so if something went sideways, you get a negative errno and not a cute moment 😭💀

🧚 SEE ALSO 🧚

the whole friend group, fr fr. first up, the kernel file she lives in: ./drivers/char/tpm/tpm_tis_i2c_cr50.c 🏠

then the extended squad — struct and functions, all in section 9:

like, go read them too. iykyk 💜

and that's the whole page, bestie!! 🎀 this baby lives in ./drivers/char/tpm, dated October 2026, and yeah — she's tpm_cr50_i2c_read(9) until the end of time. slay 💅✨🦋

📦 where this page comes from