nvmem_device_read(9)

📦 version 7.3.1, in nixpkgs unstable

✨ nvmem_device_read(9) ✨

okay so bestie, welcome to the Kernel API Manual 💅 this one is a lil function called nvmem_device_read — it reads stuff out of a given nvmem device 🎀 and honestly? it's giving "just read the bytes, diva." let's get into it 🦋

🌸 NAME 🌸

nvmem_device_read — read from a given nvmem device 📖✨

🫶 SYNOPSIS 🫶

int nvmem_device_read (struct nvmem_device *nvmem , unsigned int offset
, size_t bytes , void *buf );

like, that's the whole signature, no cap 🔥

💖 ARGUMENTS 💖

  • nvmem — the nvmem device you wanna read from 🎀 this is your main character.
  • offset — where in the nvmem device you're starting, bestie. an offset, if you will 😌
  • bytes — how many bytes you want. the literal count 🍓
  • buf — buffer pointer which will be populated on successful read ✨ like, it starts empty-ish and gets filled up with the good stuff if everything goes well 💜

⭐ RETURN ⭐

on success you get the length of successful bytes read — like, how much actually came through 🥳

on error you get a negative error code 😭 so if you see a negative number, that's the vibe check failing, periodt.

🦋 SEE ALSO 🦋

kernel file ./drivers/nvmem/core.c — and the whole friend group of related funcs, all listed here because we don't gatekeep 👑

like, that's a lot of friends but they're all iconic in their own way 🌈

lowkey a reminder: if the read fails you're getting a negative error code back, so don't just cast it to a length and vibe — check that sign first 🙈💀

omg and that's a wrap 🎀 this page lives under ./drivers/nvmem, from the October 2026 era of the manual, and yes — nvmem_device_read(9) is the title, slay 💜 bye bestie, go read some bytes 🦋✨

📦 where this page comes from