STRUCT ALPS_PROTOCOL_INFO(9)

💅 struct alps_protocol_info(9) — like, the whole vibe of a device's protocol, bestie ✨

okay so this is a page from the Kernel API Manual, section 9, and it's all about struct alps_protocol_info — literally the little info card that tells you which protocol a device is speaking 🎀

🌸 NAME 🌸

struct alps_protocol_info — the tea on which protocol a device is using 🫖✨

💖 SYNOPSIS 💖

here's the struct in all its glory, no cap, copy it exactly:

struct alps_protocol_info {
    u16 version;
    u8 byte0, mask0;
    unsigned int flags;
 };

that's it. that's the whole thing. she's small but she's doing a lot 💅

👑 Members 👑

• version — tells you whether we're in V1 / V2 / V3 / ... territory, iykyk 🔥
• byte0 — this one's a little detective 🕵️‍♀️ it helps you figure out whether a position report packet actually matches the known format for this model. the rule is: the first byte of the report, ANDed with mask0, should match byte0. that's the vibe check right there ✨
• mask0 — the mask used to check the first byte of the report. yes it works with byte0 above, they're a duo 🫶
• flags — bonus device capabilities, like the passthrough port, trackstick, etc. — the extra little garnish on top 🌈

🦋 SEE ALSO 🦋

kernel file ./drivers/input/mouse/alps.h, plus these iconic structs: struct alps_model_info(9), struct alps_nibble_commands(9), struct alps_fields(9), and struct alps_data(9) ⭐ go read them, they're all in the same friend group fr fr

okay that's the whole page, mwah 💋 and for the cute sign-off: this one lives under ./drivers/input/mouse and it's dated October 2026 — periodt, go off, and remember: mask first, then match 💖✨🎀