extcon_register_notifier(9)

💖 extcon_register_notifier(9) 💖

okay bestie, welcome to the Kernel API Manual — today’s main character is extcon_register_notifier, and she is here to get you hooked up with extcon state-change notifications. no cap. 🎀

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✨ NAME ✨

extcon_register_notifier — register a notifier block to get notified by any state changes from the extcon. literally that’s the whole vibe. 💅

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🌸 SYNOPSIS 🌸

int extcon_register_notifier (struct extcon_dev *edev , unsigned int id
, struct notifier_block *nb );

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💅 ARGUMENTS 💅

• edev — the extcon device. your extcon bestie in question. 🫶
• id — the unique id indicating an external connector. yes, the one and only id. ⭐
• nb — a notifier block to be registered. this is the block that gets its moment. 💖

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🦋 DESCRIPTION 🦋

Heads up, bestie: the second parameter given to the callback of nb (val) is the current state of an external connector, and the third pameter is the pointer of extcon device. 💀 yes, keep that mental note close.

Returns 0 if success or an error number if fail. periodt. ✨

okay but fr fr, remember: val = current state of an external connector, third pameter = pointer of extcon device. don’t let the callback girlies confuse you. 💅

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/extcon/extcon.c
• struct extcon_cable(9)
• extcon_sync(9)
• extcon_get_state(9)
• extcon_set_state(9)
• extcon_set_state_sync(9)
• extcon_get_property(9)
• extcon_set_property(9)
• extcon_set_property_sync(9)
• extcon_get_property_capability(9)
• extcon_set_property_capability(9)
• extcon_get_extcon_dev(9)
• extcon_unregister_notifier(9)
• extcon_register_notifier_all(9)
• extcon_unregister_notifier_all(9)
• extcon_alloc_cables(9)
• extcon_alloc_muex(9)
• extcon_alloc_groups(9)
• extcon_dev_register(9)
• extcon_dev_unregister(9)
• extcon_get_edev_name(9)

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mwah 💋 — signed off from the Kernel API Manual, source ./drivers/extcon, date October 2026. slay and read your notifier docs, bestie. 👑