STRUCT AB8500(9)

💖 struct ab8500(9) — like, the ab8500 internal structure, bestie 💖

okay so this is a page from the Kernel API Manual, and it's all about struct ab8500 — literally the ab8500 internal structure. it's giving "driver guts" and honestly i'm obsessed 🫶

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✨ NAME ✨

struct ab8500 — ab8500 internal structure. that's it, that's the whole vibe 💅

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🌸 SYNOPSIS 🌸

struct ab8500 {
    struct device   *dev;
    struct mutex    lock;
    struct mutex    irq_lock;
    atomic_t transfer_ongoing;
    int irq;
    struct irq_domain  *domain;
    enum ab8500_version version;
    u8 chip_id;
    int (*write)(struct ab8500 *ab8500, u16 addr, u8 data);
    int (*write_masked)(struct ab8500 *ab8500, u16 addr, u8 mask, u8
data);
    int (*read)(struct ab8500 *ab8500, u16 addr);
    unsigned long   tx_buf[4];
    unsigned long   rx_buf[4];
    u8 *mask;
    u8 *oldmask;
    int mask_size;
    const int *irq_reg_offset;
    int it_latchhier_num;
 };

no cap, that's the whole struct. every field, not one skipped, because we do not leave members behind in this house 🎀

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🦋 MEMBERS 🦋

okay bestie, field-by-field tour, let's GO 🔥

• dev — parent device. the main character, the one it answers to 💜
• lock — read/write operations lock. guards the actual data moves 🔒
• irq_lock — genirq bus lock. yes it's a second lock, she's got layers ✨
• transfer_ongoing — 0 if no transfer ongoing. literally a "is anybody home" flag 🙈
• irq — irq line. the actual interrupt line, iconic 🌈
• version — chip version id (e.g. ab8500 or ab9540). which chip era we're in ⭐
• chip_id — chip revision id. tiny little revision number, but she matters 🍓
• write — register write. the functor that actually writes 📝
• write_masked — masked register write. writing but selectively, picky queen 💅
• read — register read. yep, the read one 🌸
• tx_buf — tx buf for SPI. transmit buffer for SPI 💖
• rx_buf — rx buf for SPI. receive buffer for SPI, the twin 🫶
• mask — cache of IRQ regs for bus lock. cached IRQ regs, for the bus lock 🧚
• oldmask — cache of previous IRQ regs for bus lock. the previous cached IRQ regs, also for the bus lock 👑
• mask_size — Actual number of valid entries in mask[], oldmask[] and irq_reg_offset. like, the real count of what's actually valid in there, no fake entries 🔥
• irq_reg_offset — Array of offsets into IRQ registers. an array, and it's full of offsets into the IRQ registers 💀
• it_latchhier_num — ok so this one's just chillin' in the struct with no description on the page. i'm not gonna invent lore for her, that would be lying and we don't do that 🎀

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👑 SEE ALSO 👑

go look at these, iykyk:

• Kernel file ./include/linux/mfd/abx500/ab8500.h
• struct ab8500_platform_data(9)

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fr fr: every field name and type above is copy-pasted exactly from the source, so don't come for me if your u8 count is off — it's not, it's just a lot 💀

and that's the page!! 💖 stay slay, keep your locks balanced, and may your transfers never be "ongoing" forever ✨🎀🦋

this lil gem comes from ./include/linux/mfd/abx500, dated October 2026, and she's filed as struct ab8500(9) — mwah, bye bestie 💜🌸