devm_extcon...ter_notifier(9)

💖 NAME 💖

devm_extcon_register_notifier — it's literally the resource-managed version of extcon_register_notifier() ✨ (yes, the Kernel API Manual girlies stay winning)

🎀 SYNOPSIS 🎀

int devm_extcon_register_notifier (struct device *dev , struct extcon_dev *edev , unsigned int id , struct notifier_block *nb );

🦋 ARGUMENTS 🦋

• dev — the device that owns the extcon device being created 🫶 like, this is the main character's parent, okurr
• edev — the extcon device itself, hi bestie 💅
• id — the unique id among the extcon enumeration 🔥 unique queen behavior, no dupes allowed
• nb — a notifier block to be registered 📝 the little block that's about to be on the list

🌸 DESCRIPTION 🌸

Okay so here's the tea ☕: this function manages the notifier of an extcon device automatically, using device resource management — which is the whole point, it lowkey simplifies the control of unregistering the notifier of the extcon device. You don't have to hand-hold the cleanup, it's giving main character energy that handles its own business 💖

⚠️ not me forgetting this one — the second parameter given to the callback of nb (val) is "old_state", not the current state. Bestie. Read that twice 😭 The current state can be retrieved by looking at the third parameter (the edev pointer)'s state value. That's where the now lives, iykyk 👑

Returns 0 if success, or a negative error number if failure 💀 (so like, if you get a negative back, that's a no from the kernel, periodt)

🧚 SEE ALSO 🧚

• Kernel file ./drivers/extcon/devres.c
• devm_extcon_dev_allocate(9)
• devm_extcon_dev_free(9)
• devm_extcon_dev_register(9)
• devm_extcon_dev_unregister(9)
• devm_extcon_unregister_notifier(9)
• devm_extcon_register_notifier_all(9)
• devm_extcon_unregister_notifier_all(9)

🌈 and that's the whole page bestie! This one lives in the Kernel API Manual, source ./drivers/extcon, dated October 2026 — go slay some notifiers, mwah 💋🎀