should_enable_udc(9)

📦 version 7.3.1, in nixpkgs unstable

✨ should_enable_udc(9) ✨

okay so real talk — this is a page from the Kernel API Manual, and it's the lil' function that decides whether your UDC gets turned on or stays in its flop era. bestie, let's get into it 💅

🌸 SYNOPSIS 🌸

int should_enable_udc (struct pxa_udc *udc );

that's the whole signature, no cap. returns an int, takes one pointer, done.

🎀 ARGUMENTS 🎀

  • udc — the udc device. that's it, that's the whole argument list. she's low maintenance 💖

🦋 CONTEXT 🦋

any — literally anywhere. no locks, no sleeping rules, no "only from process context" gatekeeping. call it whenever, she's flexible ✨

👑 DESCRIPTION 👑

okay so here's the vibe check the function runs on your UDC. the UDC should be enabled if all of these line up:

  • the pullup resistor is connected 🔌
  • and a gadget driver is bound 🧚
  • and vbus is sensed (or no vbus sense is available) ⚡
note the "or no vbus sense is available" part — that's the little escape hatch so the check doesn't just die when there's nothing to sense. don't sleep on it 🙈

and what does she give you back? Returns 1 if UDC should be enabled, 0 otherwise. that's the whole deal, fr fr 💀

🌈 SEE ALSO 🌈

all the siblings, cousins and extended family live in ./drivers/usb/gadget/udc/pxa27x_udc.c — go say hi:

and that's the page 💜 this lil' icon lives in ./drivers/usb/gadget/udc and the version stamp is October 2026 — so go forth, call should_enable_udc, and slay ✨🫶

📦 where this page comes from