STRUCT AC97_ID(9)

🌸 struct ac97_id(9) 🌸

okay so bestie, welcome to the struct ac97_id(9) page — straight out of the Kernel API Manual, no cap. this is the little struct that matches a codec device and driver on an ac97 bus, and honestly? she's doing a lot with very few fields. 💅

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✨ NAME ✨

struct ac97_id — matches a codec device and driver on an ac97 bus 🎀

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✨ SYNOPSIS ✨

struct ac97_id {
    unsigned int            id;
    unsigned int            mask;
    void *data;
 };

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💖 Members 💖

• id — the significant bits of the codec vendor ID1 and ID2. that's the part that actually matters when we're doing the whole matching thing 🦋
• mask — the bitmask that says which bits of the id field are significant when matching. basically the "only look over here" list. lowkey the whole personality of this struct ngl. 💀

a driver binds to a device when:

((vendorID1 << 8 | vendorID2) & (mask_id1 << 8 | mask_id2)) == id.

like, that's the vibe check. if the masked vendor IDs line up with id, congratulations, you're matched 💖

• data — private data used by the driver. her own little stash, nobody else's business 🫶

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🌈 SEE ALSO 🌈

• Kernel file ./include/sound/ac97/codec.h
• struct ac97_codec_device(9)
• struct ac97_codec_driver(9)

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bestie reminder: the match only works because of that exact expression up in mask — don't go rewriting it, the parentheses are load-bearing 💅✨

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and that's the whole page, you ate it 💜 this came from ./include/sound/ac97, dated October 2026, and the man page herself goes by struct ac97_id(9). periodt. 🎀🧚‍♀️⭐