i2c_get_adapter_by_fwnode(9)

📦 version 7.3.1, in nixpkgs unstable

💅 i2c_get_adapter_by_fwnode — the i2c_adapter manual, bestie edition

okay so real talk: this page is a Kernel API Manual entry, and the function is literally called i2c_get_adapter_by_fwnode. Say it with your chest. 🎀

✨ NAME ✨

i2c_get_adapter_by_fwnode — find an i2c_adapter for the fwnode. that's it. that's the whole vibe. 🦋

✨ SYNOPSIS ✨

struct i2c_adapter * i2c_get_adapter_by_fwnode (struct fwnode_handle
*fwnode );

like yes she takes one argument and returns a pointer, she's lowkey low-maintenance 💅

✨ ARGUMENTS ✨

  • fwnode — a struct fwnode_handle that corresponds to the struct i2c_adapter. that's your little handle bestie, she's the matching key 🎀

✨ DESCRIPTION ✨

so basically ✨ she looks up the struct i2c_adapter that corresponds to the fwnode and returns it, and she increments the adapter module's use count. two things, one function, main character energy 👑

if no adapter can be found, or if fwnode is NULL, she returns NULL. no adapter, no problem, just NULL. 💀

⚠️ okay this part matters, do not skip it: the user must call i2c_put_adapter(adapter) once they're done with the i2c adapter. like, you gotta give her back. no cap.

and ngl, note that this is different from i2c_find_adapter_by_node. not the same function, not the same behavior, don't mix them up 🙈

✨ SEE ALSO ✨

kernel file ./drivers/i2c/i2c-core-base.c (yes, that's where she lives 🏠) and her whole friend group:

💖 that's the whole page babes 💖 signed, sealed, delivered from ./drivers/i2c, dated October 2026 — this Kernel API Manual moment is officially a wrap, slay 🫶🌸

📦 where this page comes from