dwc3_gadget_set_test_mode(9)

📦 version 7.3.1, in nixpkgs unstable

💅 dwc3_gadget_set_test_mode 💅

okay so real talk, this is a page straight out of the Kernel API Manual, section 9, and it's all about one little function that enables usb2 test modes ✨ like it's literally the hype-woman for USB2 test mode, no cap.

🌸 SYNOPSIS 🌸

int dwc3_gadget_set_test_mode (struct dwc3 *dwc , int mode );

yep that's the whole vibe check right there — you hand it your context struct and a mode, it hands you back an int. iconic. 🎀

🦋 ARGUMENTS 🦋

  • dwc — pointer to our context structure 🫶 (yes, our context structure, we're all in this together bestie)
  • mode — the mode to set (J, K SE0 NAK, Force Enable) — those are the literal options, don't come for me, I'm just the messenger 💅

👑 DESCRIPTION 👑

so here's the tea ☕ — Caller should take care of locking. that's on you, bestie, this function is not doing it for you, it's giving main character energy but not that much main character energy. 🔥

and then: this function will return 0 on success, or -EINVAL if a wrong Test Selector is passed. so if you get -EINVAL back, that's the universe telling you your Test Selector was not it 🙈 literally the vibe check failed.

⚠️ no cap: locking is the caller's whole entire job here. do not skip it, do not pass go.

💜 SEE ALSO 💜

okay this list is long long, but we're listing every single one because they're all family, periodt. 💖

Kernel file ./drivers/usb/dwc3/gadget.c:

and that's the whole page, bestie 🧚 go forth and set those test modes responsibly 💅

source: ./drivers/usb/dwc3 · dated October 2026 · this has been your girl on the manpage beat, mwah 🫶

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