mux_state_get(9)

📦 version 7.3.1, in nixpkgs unstable

💅 mux_state_get — from the Kernel API Manual ✨

okay bestie, gather round, because this one is a lookup function and she is lowkey the main character of the mux subsystem. mux_state_get is literally the function that goes "hey, does this device have a mux-state? and if so, can I have it?" 🎀

✨ NAME ✨

mux_state_get — Get the mux-state for a device. 🫶 that's it, that's the whole vibe.

🌸 SYNOPSIS 🌸

struct mux_state * mux_state_get (struct device *dev , const char
*mux_name , bool optional , struct device_node *np );

no cap, that's the exact signature, don't @ me, I copied it character for character 💅

💖 ARGUMENTS 💖

  • dev — The device that needs a mux-state. your little guy. the one who's asking. 👑
  • mux_name — The name identifying the mux-state. like a name tag at a party, but for muxes. 🏷️
  • optional — Whether to return NULL and silence errors when mux doesn't exist. so if it's set and the mux is a no-show, you get a chill NULL instead of a whole dramatic error situation. 😌
  • np — the device nodes, use dev->of_node if it is NULL. that's the fallback, that's the default, that's the move. 🦋

⭐ RETURN ⭐

  • Pointer to the mux-state on success 🎉 — you ate, congrats
  • an ERR_PTR with a negative errno on error 😭 — check it with IS_ERR()-energy, don't just raw-dog the pointer
  • or NULL if optional is true and mux doesn't exist 🙈 — no drama, no error, just a gentle nothing
like yes queen, three whole outcomes, so please actually check what you got back before you dereference it. fr fr. 💀

🌈 SEE ALSO 🌈

the source of truth lives in the Kernel file ./drivers/mux/core.c — go read her, she's iconic. and then the whole extended friend group:

like, that's a whole group chat and every single one of them is in it. iykyk 💜

okay that's the page!! sourced straight from ./drivers/mux, dated October 2026, and brought to you by the Kernel API Manual. mwah 💋 slay, go get your mux-state, and remember: check your return values bestie 🧚✨

📦 where this page comes from