is_jack_detectable(9)

✨ is_jack_detectable(9) — the "can this pin even?" check ✨

okay so bestie, this one's from the Kernel API Manual, section 9, and it's lowkey one of those tiny helper functions that saves you from a whole vibe collapse. let's get into it 🫶

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🌸 NAME 🌸

is_jack_detectable — checks whether the pin you're eyeing is actually jack-detectable 👀

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🎀 SYNOPSIS 🎀

bool is_jack_detectable (struct hda_codec *codec , hda_nid_t nid );

it returns a bool, so like… yes or no, no ✨mystery✨

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🦋 ARGUMENTS 🦋

• codec — the HDA codec, aka the main character of this whole situation 💅
• nid — the pin NID. that's your pin's little ID card 🪪

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💖 DESCRIPTION 💖

so what it does: it checks whether the given pin is capable of reporting jack detection. like, does this pin have the range? can it even? 🎤

and here's the tea — the jack detection might not work, and honestly there are several reasons for that, so don't come for this function:

• the jack detection is prohibited at the codec level 🚫
• the pin config has the AC_DEFCFG_MISC_NO_PRESENCE bit set
• no unsol support
• etc. (yes, the manpage literally says "etc." and i respect the confidence 😭)

ngl bestie, "might not work by various reasons" is doing a LOT of heavy lifting here, but that's exactly why you check first instead of just assuming. vibe check before the vibe check, yk? ✨

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👑 SEE ALSO 👑

• Kernel file ./sound/hda/common/jack.c 💾
• snd_hda_jack_tbl_get_mst(9)
• snd_hda_jack_tbl_get_from_tag(9)
• snd_hda_jack_tbl_new(9)
• snd_hda_jack_set_dirty_all(9)
• snd_hda_jack_pin_sense(9)
• snd_hda_jack_detect_state_mst(9)
• snd_hda_jack_detect_enable_callback_mst(9)
• snd_hda_jack_detect_enable(9)
• snd_hda_jack_set_gating_jack(9)
• snd_hda_jack_bind_keymap(9)
• snd_hda_jack_set_button_state(9)
• snd_hda_jack_report_sync(9)
• snd_hda_jack_add_kctl_mst(9)
• snd_hda_jack_add_kctls(9)
• snd_hda_jack_unsol_event(9)
• snd_hda_jack_poll_all(9)

like, that's the whole jack.c friend group and they ALL ate 🔥 go read them, iykyk 💜

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🌈 the cute sign-off 🌈

this lil page lives in ./sound/hda/common and it's dated October 2026 — so yeah, she's from the future, she's got main character energy, and she's is_jack_detectable(9) 🧚‍♀️ stay detecTABLE, bestie 💅🎀