G760A(4)

💖 G760A 💖

okay bestie, so this one's g760a from the Kernel Interfaces Manual — a driver page, and honestly it's short and sweet, so let's go 🎀

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✨ NAME ✨

g760a — the Global Mixed-mode Technology Inc. G760a fan speed controller driver. yes, that's the whole name, it's a whole mouthful, I know 😭

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✨ SYNOPSIS ✨

g760a0 at iic? addr 0x3e

that's it. that's the whole vibe. one line, slays, moves on 💅

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✨ DESCRIPTION ✨

so the g760a driver provides support for the Global Mixed-mode Technology Inc. G760a fan speed controller — it lives on iicbus and it's meant to be used with the envsys(4) API 🌀 and like, fun fact, this chip could be found in D-Link's DNS-323 NAS box, which is giving vintage tech main character energy ngl.

the following sysctl(8) variable controls the fan's speed 👇

🌀 machdep.g760a0.rpm

• machdep.g760a0.rpm — this value specifies the desired speed for the fan 💨 valid range is 2000..20000 or 0 (which means the fan is turned off, lights out, sleepy time 😴). the default value is 0.

⚠️ okay so here's the tea, and it's important: when you set the desired speed, the RPM number gets converted to the internal representation and truncated 🫠 like, it doesn't land exactly where you asked. for example, when you're setting 2000 it'll be truncated to 2006, and 8000 will be changed to 8057. so close bestie, but not quite 😭 that's just how the chip maths out, no cap.

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✨ SEE ALSO ✨

• envsys(4)
• lm(4)
• envstat(8)

go read those, they're the supporting cast and they ate 🫶

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✨ AUTHORS ✨

the g760a driver was written by A. Leo 👑 iconic of them honestly, we stan a credited author.

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and that's the whole page bestie!! 🌈✨ this one came from Debian, dated April 11, 2008 🎀 so yeah she's an elder, respect the elders, mwah 💋🦋