STRUCT ALPS_NIBBLE_COMMANDS(9)

💅 struct alps_nibble_commands(9) — a Kernel API Manual moment

okay so bestie, welcome to the Kernel API Manual page for struct alps_nibble_commands — yes that's the whole title, and yes it's a lot, but stay with me because this little struct is genuinely iconic. 🎀

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✨ NAME ✨

struct alps_nibble_commands — encodings for register accesses 🦋

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🌸 SYNOPSIS 🌸

struct alps_nibble_commands {
    int command;
    unsigned char data;
 };

like, that's it. two fields. tiny struct, main character energy. 👑

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💖 Members 💖

• command — the PS/2 command used for the nibble. this is the actual instruction being sent out, no cap. 💅
• data — the data supplied as an argument to the PS/2 command, if applicable. so like, sometimes it needs a lil extra, sometimes it doesn't. know your context, bestie. 🫶

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🔥 Description 🔥

so here's the tea: the ALPS protocol uses magic sequences to transmit binary data to the touchpad. 🧚 why sequences and not just, you know, sending the bytes? because it is generally not OK to send arbitrary bytes out the PS/2 port. periodt. that's the whole reason this table exists.

each of the sequences in this table sends one nibble of the register address or (write) data. one nibble. half a byte. that's the vibe — slow and steady, one nibble at a time. 🍓

and because nothing in this world is ever simple: different versions of the ALPS protocol use slightly different encodings. so like, same idea, different fits. 💀

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⭐ SEE ALSO ⭐

• Kernel file ./drivers/input/mouse/alps.h
• struct alps_protocol_info(9)
• struct alps_model_info(9)
• struct alps_fields(9)
• struct alps_data(9)

go read the whole friend group, they all hang out in the same header. 🌈

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ngl this page is short but she ate. no invented behaviour, no extra lore — just the struct, the members, the magic sequences, and the friends she references. 💜

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okay bye bestie! 🦋 this one lives in ./drivers/input/mouse (that's the source, mwah) and it's dated October 2026 — so like, future vibes only. the manual name is struct alps_nibble_commands(9) in case you forgot on your way out. slay. 💅✨