devm_of_led_get_optional(9)

📦 version 7.3.1, in nixpkgs unstable

💡 devm_of_led_get_optional(9) — the Kernel API Manual tea ☕✨

okay so bestie, welcome to the glow-up zone 🎀 this one lives in the Kernel API Manual and it's literally called devm_of_led_get_optional — say that five times fast, i dare you 💀

✨ NAME ✨

devm_of_led_get_optional — resource-managed request of an optional LED device 🌈

like, it grabs you an LED but it's the chill, "no pressure if it's not there" kind of grab 🫶

🦋 SYNOPSIS 🦋

struct led_classdev * devm_of_led_get_optional (struct device *dev , int index );

that's the whole vibe check right there 👑 returns a pointer to struct led_classdev, takes your device plus an index, no cap 💅

🌸 ARGUMENTS 🌸

  • dev — the LED consumer 💖 (yes, that's you, you're the consumer, main character energy)
  • index — index of the LED to obtain in the consumer 🔢

⭐ DESCRIPTION ⭐

so what actually happens? the device node of the device is parsed to find the requested LED device 🔍✨ that's the whole process, it goes looking through the device node, finds the LED you asked for.

and here's the iconic part: the LED device returned from this function is automatically released on driver detach 🧚‍♀️🎀 it's resource-managed, meaning devm_ did the cleanup chores for you, bestie. you don't have to remember. it remembers for you. obsessed.

then it returns a pointer to a LED device, ERR_PTR(errno) on failure, and NULL if the led was not found 💜

⚠️ okay so real talk — NULL does not mean "oops something broke". NULL means "the led was not found", which tracks, because this is the optional one. failure is a whole separate thing: that's ERR_PTR(errno). don't confuse them fr fr 🙈

🔥 SEE ALSO 🔥

the kernel file is ./drivers/leds/led-class.c and it's giving lore encyclopedia:

and that's the page, bestie 🌈💖

this whole thing ships out of ./drivers/leds and the date on it is October 2026 — so yeah, it's from the future, iykyk ⭐🦋 slay, go light something up 💡✨

📦 where this page comes from