STRUCT MEDIA_ENTITY_NOTIFY(9)

💖 struct media_entity_notify(9) 💖

okay bestie so this is from the Kernel API Manual and it's literally all about struct media_entity_notify — Media Entity Notify, the glow-up your media device gets when it wants to know when new entities show up ✨

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🌸 SYNOPSIS 🌸

like here's the whole vibe, character for character, no edits:

struct media_entity_notify {
    struct list_head list;
    void *notify_data;
    void (*notify)(struct media_entity *entity, void *notify_data);
 };

🎀 Members 🎀

• list — the list head, aka the lil anchor that keeps this thing chained into the list 🦋
• notify_data — the input data you hand over when the callback gets invoked, it's giving "payload, but make it yours" 💅
• notify — the callback function pointer, the main character of this struct fr fr 🔥

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👑 Description 👑

so basically, drivers may register a callback to take action when new entities get registered with the media device. that's the whole point. that's the assignment. 🫶

this handler is intended for creating links between existing entities — that's its job, that's its lane, that's its era.

⚠️ okay but listen: it should not create entities and register them. nope. not it. don't do that. that's not what this callback is for, bestie 😭

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🌈 SEE ALSO 🌈

Kernel file ./include/media/media-device.h — and every one of these icons, no skips, no cap:

• struct media_device_ops(9)
• struct media_device(9)
• media_device_init(9)
• media_device_cleanup(9)
• __media_device_register(9)
• media_device_register(9)
• media_device_unregister(9)
• media_device_register_entity(9)
• media_device_unregister_entity(9)
• media_device_register_entity_notify(9)
• media_device_unregister_entity_notify(9)
• media_device_pci_init(9)
• __media_device_usb_init(9)
• media_device_usb_init(9)
• media_set_bus_info(9)

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and that's the tea ☕ — shipped from ./include/media, dated October 2026, straight out of the Kernel API Manual. slay, go read the source, mwah 💜🎀