acpi_register_gsi(9)

💖 acpi_register_gsi — the kernel API manual, but make it make sense 💖

okay so bestie, welcome to acpi_register_gsi(9) from the Kernel API Manual. no cap, this one is short and sweet and honestly kind of iconic. it's the little function that maps a GSI to a linux IRQ number. let me break it down 🎀

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✨ NAME ✨

acpi_register_gsi — literally the function that maps a GSI to a linux IRQ number 💅

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✨ SYNOPSIS ✨

int acpi_register_gsi (struct device *dev , u32 gsi , int trigger , int
polarity );

look at her. four arguments, one int return, no drama. we stan a tidy signature 🫶

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✨ ARGUMENTS ✨

• dev — the device for which the IRQ has to be mapped. it's giving "who is this for" energy 🌸
• gsi — the GSI IRQ number, i.e. the thing you're mapping 👑
• trigger — the trigger type of the GSI number to be mapped ⚡
• polarity — the polarity of the GSI to be mapped 🧚

like yes ma'am, four little params and every single one matters 🙈

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✨ RETURN ✨

on success you get a valid linux IRQ number 🎉 and on failure you get -EINVAL 😭 (bestie check your inputs, fr fr).

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✨ SEE ALSO ✨

living in the kernel file ./drivers/acpi/irq.c, and here's the whole friend group 💜:

• acpi_gsi_to_irq(9)
• acpi_unregister_gsi(9)
• acpi_get_irq_source_fwhandle(9)
• acpi_irq_parse_one_match(9)
• acpi_irq_parse_one_cb(9)
• acpi_irq_parse_one(9)
• acpi_irq_get(9)
• acpi_set_irq_model(9)
• acpi_set_gsi_to_irq_fallback(9)
• acpi_irq_create_hierarchy(9)

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and that's the whole page, no notes 🔥 this little beauty lives in ./drivers/acpi and the version stamped on her is October 2026. go map some IRQs, bestie, you're gonna slay 🦋⭐💖