tb_nvm_read_version(9)

📦 version 7.3.1, in nixpkgs unstable

✨ tb_nvm_read_version ✨

okay so real talk, bestie — this is a page straight out of the Kernel API Manual, and it's about one very specific little function called tb_nvm_read_version. it's giving "quiet hero of the Thunderbolt NVM world" honestly 🦋

🌸 NAME 🌸

tb_nvm_read_version — Read and populate NVM version 💅

like yes, that's literally the whole job. read the version, populate the version. no cap.

🌈 SYNOPSIS 🌈

int tb_nvm_read_version (struct tb_nvm *nvm );

that's it. that's the whole call. one argument, one int coming back at you 🎀

💜 ARGUMENTS 💜

  • nvm — the NVM structure, aka your main character of the hour. it's a struct tb_nvm *, and it's the thing getting read into.

🫶 DESCRIPTION 🫶

so what does it actually do? it uses vendor specific means to read and fill out the existing active NVM version. yep — vendor specific, meaning the actual way it goes about it depends on the vendor's own ops. this function is just the friendly doorway to that whole situation ✨

think of it as: "hey, whoever made this hardware, go read the current active NVM version and stick it in here." and it does. iconic behavior, honestly 👑

⭐ RETURN ⭐

  • 0 on success 🎉
  • a negative errno otherwise 😭

that's the whole contract. zero means we ate. negative means something went sideways.

ngl bestie, always check the return value. 0 is the vibe, anything negative is your sign to go look at errno and figure out what the hardware was going through 💀

🦋 SEE ALSO 🦋

Kernel file ./drivers/thunderbolt/nvm.c, plus the whole friend group:

okay that's the whole page, bestie — you now know tb_nvm_read_version better than it knows itself 💖

this little cutie lives in ./drivers/thunderbolt, and the page is dated October 2026. go forth and read those NVM versions, you absolute legend 🌟👑
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