ENUM HWMON_TYPE(9)

💅 enum hwmon_type(9)

okay so welcome to the Kernel API Manual bestie, we're doing an enum today and honestly it's giving "list of vibes" 🦋

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✨ NAME ✨

enum hwmon_type — yeah so the original page literally has no description here, not a single word. iconic of it, honestly. 💀 so like... an enum, named hwmon_type, and that's the whole story. it does not elaborate. periodt.

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🌸 SYNOPSIS 🌸

okay so here's the whole thing laid out, every single constant, exactly as written, no cap:

enum hwmon_type {
    HWMON_TYPE_NONE ,
    HWMON_TYPE_CPU ,
    HWMON_TYPE_CURR ,
    HWMON_TYPE_ENERGY ,
    HWMON_TYPE_FAN ,
    HWMON_TYPE_HUMIDITY ,
    HWMON_TYPE_IN ,
    HWMON_TYPE_INTRUSION ,
    HWMON_TYPE_POWER ,
    HWMON_TYPE_PWM ,
    HWMON_TYPE_TEMP ,
    HWMON_TYPE_MAX

};

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🎀 Constants 🎀

so the source doc is very much "no thoughts, head empty" on these, and I'm not about to make stuff up, so here's the honest truth — every one of these is marked -- undescribed --. yes, literally all twelve. we love a mysterious queen 👑

• HWMON_TYPE_NONE — -- undescribed --
• HWMON_TYPE_CPU — -- undescribed --
• HWMON_TYPE_CURR — -- undescribed --
• HWMON_TYPE_ENERGY — -- undescribed --
• HWMON_TYPE_FAN — -- undescribed --
• HWMON_TYPE_HUMIDITY — -- undescribed --
• HWMON_TYPE_IN — -- undescribed --
• HWMON_TYPE_INTRUSION — -- undescribed --
• HWMON_TYPE_POWER — -- undescribed --
• HWMON_TYPE_PWM — -- undescribed --
• HWMON_TYPE_TEMP — -- undescribed --
• HWMON_TYPE_MAX — -- undescribed --

heads up bestie: that's not me being lazy, that's genuinely what's written. all twelve are undescribed in the source. don't come for me 😭

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💜 Description 💜

okay here's the actual tea, and it's good tea ☕

As described in Documentation/hwmon/sysfs-interface.rst, hwmon events are defined over multiple files of the form <type><num>_<item>. This enum captures potential <type> values. 🫶

so like — the filename pattern is literally <type><num>_<item>, and this enum is the <type> part of that equation. the whole squad of possible type values, collected in one place. ate. 💅

also, this enum is exposed for testing. yes, it's a whole testing situation. iykyk 🌈

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🔥 SEE ALSO 🔥

go look at these, they're all right there in the kernel file ./tools/perf/util/hwmon_pmu.h, and honestly they're all main characters:

• enum hwmon_item(9)
• union hwmon_pmu_event_key(9)
• parse_hwmon_filename(9)
• hwmon_pmu__new(9)

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fr fr though: none of these are optional reading if you're deep in the hwmon perf util situation. go read them. i'll wait. 🧚

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and that's the page!! 🎉 shoutout to ./tools/perf/util for bringing us this absolute bop, dated October 2026, from the Kernel API Manual obviously. mwah 💋 slay, go read some sysfs docs, drink water, ily 💖⭐