STRUCT CROS_EC_LPC(9)

💅 struct cros_ec_lpc(9) — like, the LPC device-specific data era 💅

okay bestie, welcome to the Kernel API Manual ✨ — this one's all about struct cros_ec_lpc, which is literally just the LPC device-specific data and nothing more, no cap 🫶. Think of it as the little info packet that says "hey, here's where the EC lives and here's how we talk to it." 🌸

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✨ NAME ✨

struct cros_ec_lpc — LPC device-specific data 🎀 (yes that's the whole name, she's minimal, she's iconic)

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🦋 SYNOPSIS 🦋

struct cros_ec_lpc {
    u16 mmio_memory_base;
    void __iomem *base;
    struct acpi_resource_fixed_memory32 mem32;
    int (*read)(struct cros_ec_lpc *ec_lpc, unsigned int offset,
unsigned int length, u8 *dest);
    int (*write)(struct cros_ec_lpc *ec_lpc, unsigned int offset,
unsigned int length, const u8 *msg);
 };

like, look at her. five fields. every one of them pulling its weight 💜

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🫶 Members 🫶

• mmio_memory_base — the first I/O port addressing EC mapped memory. that's it, that's the vibe check 👑
• base — for EC supporting memory mapping, this is the base address of the mapped region. if your EC is a memory-mapping main character, this is her address 🏡
• mem32 — the info about the memory mapped register region, if present. note the "if present," bestie — it might not be there 🙈
• read — copies length bytes from the EC address offset into the buffer dest. returns a negative error code on error, or the 8-bit checksum of all bytes read. so like, either it's mad 😭 or it hands you a checksum 🔥
• write — copies length bytes from the buffer msg into the EC address offset. returns a negative error code on error, or the 8-bit checksum of all bytes written. same deal, opposite direction, symmetry slay 💅

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/platform/chrome/cros_ec_lpc.c
• struct lpc_driver_data(9)

both linked from that kernel file, so go read them together, iykyk 🧚

ngl if you're poking at the EC without knowing which of these fields actually got filled in, that's giving "undefined behaviour energy" — check mem32 before you assume anything is present ⭐

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aaand that's the page, bestie 💖 — straight from ./drivers/platform/chrome, October 2026, struct cros_ec_lpc(9) era. go forth and interrogate your embedded controller 🦋🎀