usb4_port_retimer_nvm_read(9)

📦 version 7.3.1, in nixpkgs unstable

💅 usb4_port_retimer_nvm_read(9) — like, the Kernel API Manual bestie 🎀

okay so. bestie. picture this: you've got a USB4 port, you've got a retimer, and you've got an NVM that's just sitting there full of bytes you desperately need to see. this little function? it's the one that goes and gets them for you. it's giving "personal shopper, but for firmware." no cap. 🦋

✨ NAME ✨

usb4_port_retimer_nvm_read — literally just reads the contents of a retimer NVM. that's it. that's the whole thing. and honestly? iconic. 👑

🌸 SYNOPSIS 🌸

int usb4_port_retimer_nvm_read (struct tb_port *port , u8 index ,
       unsigned int address , void *buf , size_t size );

the way this signature just lines up. chef's kiss. 🤌

💖 ARGUMENTS 💖

  • port — the USB4 port in question. your main character, if you will. 🌟
  • index — the retimer index. yes bestie, you gotta say which retimer, they're not mind readers. 🙈
  • address — the NVM address, measured in bytes, where the reading starts. your little starting line. 📍
  • buf — the data read from the NVM gets stored here. this is the bag you're carrying it home in. 👜
  • size — number of bytes to read. how much you're grabbing. know your limits, queen. ✨

🎀 DESCRIPTION 🎀

so what it does is: reads the retimer NVM, then copies the contents to buf. that's the whole vibe check. it reads, it copies, it slays. 💅 no extra steps, no drama, no notes.

🔥 RETURN 🔥

  • 0 — if the read was successful. we love a zero. we stan a zero. 🥳
  • -ENODEV — if there is no retimer at index. like showing up to the party and nobody's there. devastating, honestly. 😭
  • Negative errno — in case of an error. bad vibes, unspecified flavour. 💀

🫶 SEE ALSO 🫶

Kernel file ./drivers/thunderbolt/usb4.c and honestly the entire extended universe of these functions, bestie, i'm not gatekeeping a single one:

iykyk. 🌈

okay that's the whole page, bestie, you ate that. signing off from ./drivers/thunderbolt, version October 2026 — mwah, go read some NVM, ily 💜🧚‍♀️

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