STRUCT QUAD8(9)

✨ struct quad8(9) ✨

okay so bestie, welcome to the struct quad8(9) glow-up 💅 this is a page from the Kernel API Manual, and it's literally just one struct — but she's that girl. it's the device private data structure, aka the little backpack this driver carries around for every quad8 device it babysits. 🎀

🌸 NAME 🌸

struct quad8 — the device private data structure. that's it. that's the whole vibe. she holds the state, she holds the regmap, she holds the counters. queen behavior honestly 👑

🦋 SYNOPSIS 🦋

struct quad8 {
    spinlock_t lock;
    u8 cmr[QUAD8_NUM_COUNTERS];
    u8 ior[QUAD8_NUM_COUNTERS];
    u8 idr[QUAD8_NUM_COUNTERS];
    unsigned int fck_prescaler[QUAD8_NUM_COUNTERS];
    unsigned int preset[QUAD8_NUM_COUNTERS];
    unsigned int cable_fault_enable;
    struct regmap *map;
 };

no cap, that's the whole thing. every field below gets its own lil moment ✨

💖 Members 💖

• lock — a spinlock_t that keeps the device states from getting clobbered during R/W ops 🙈 like, bestie, we are not letting two writers fight over the same registers. not on her watch. 💀
• cmr — array of Counter Mode Register states. one entry per counter, all cozy in there. 🍓
• ior — array of Input / Output Control Register states. same deal, array energy, QUAD8_NUM_COUNTERS wide. 🧚
• idr — array of Index Control Register states. yup, another array. she collects them. it's her thing. 💜
• fck_prescaler — array of filter clock prescaler configurations. unsigned int, one per counter. the timing vibes ✨
• preset — array of preset values. unsigned int again. those starting numbers live here 🎀
• cable_fault_enable — differential encoder cable status enable configurations. a single unsigned int, no array, she's a solo act. 🌈
• map — the regmap for the device. this is the main-character field, fr fr — it's how we actually talk to the hardware 🔥👑

lowkey important: the arrays are all sized with QUAD8_NUM_COUNTERS, so don't go indexing past that 😭 that's not a vibe check you want to fail.

🌟 SEE ALSO 🌟

• Kernel file ./drivers/counter/104-quad-8.c — go read the source, bestie, iykyk 🫶

and that's the page!! sourced fresh from ./drivers/counter, dated October 2026, and yes it's giving vintage-future manual energy 💀💖 mwah, slay, go forth and read your structs 😭👑