STRUCT I8254(9)

💜 struct i8254(9) — I8254 device private data structure 💜

okay bestie, welcome to the Kernel API Manual ✨ this one's short and sweet — it's the private data struct for an I8254 device, and honestly? it's giving "small but mighty." let's get into it 🫶

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🌸 NAME 🌸

struct i8254 — the I8254 device private data structure. that's it, that's the whole vibe 💅

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✨ SYNOPSIS ✨

here's the whole thing, no cap — copy it exactly, don't touch a single character:

struct i8254 {
    struct mutex lock;
    u16 preset[I8254_NUM_COUNTERS];
    u8 out_mode[I8254_NUM_COUNTERS];
    struct regmap *map;
 };

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🎀 Members 🎀

okay so these are the four things inside, and every single one of them matters:

• lock — a synchronization lock, and its whole job is to prevent I/O race conditions. lowkey the bouncer of the struct 😤 no two things touching the hardware at once, periodt.
• preset — an array of Counter Register states. yep, an array, sized I8254_NUM_COUNTERS, holding the counter states 💖
• out_mode — an array of mode configuration states. also sized I8254_NUM_COUNTERS — gotta store the mode config somewhere, and this is where 🦋
• map — the Regmap for the device. literally the map, it maps, iconic behavior 🗺️✨

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🌈 SEE ALSO 🌈

go look at these, bestie, iykyk:

• Kernel file ./drivers/counter/i8254.c
• devm_i8254_regmap_register(9)

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fr fr — if you're touching this struct you better be holding lock, that's the whole point of it 🙈

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and that's the page! 🎀 sign-off time: this masterpiece lives in ./drivers/counter, dated October 2026, and it's struct i8254(9) all the way down 💖✨ slay, bye 👑