xudc_write_fifo(9)

📦 version 7.3.1, in nixpkgs unstable

🌸 xudc_write_fifo — Kernel API Manual energy 💅

okay so bestie, welcome to xudc_write_fifo, straight out of the Kernel API Manual — it's the function that writes data into the given endpoint buffer, and it's giving tiny-but-important USB gadget helper vibes. 🦋

✨ NAME ✨

xudc_write_fifo — writes data into the given endpoint buffer. no cap, that's the whole assignment. 💖

🎀 SYNOPSIS 🎀

int xudc_write_fifo (struct xusb_ep *ep , struct xusb_req *req );

🌈 ARGUMENTS 🌈

  • ep — pointer to the usb device endpoint structure. it's the endpoint bestie in question 🫶
  • req — pointer to the usb request structure. the request side of the situation 💌

⭐ RETURN ⭐

  • 0 — if request is completed. slay, we're done ✅
  • -EAGAIN — if not completed. not a fail, just a "try again later" situation 😭

💜 DESCRIPTION 💜

Loads endpoint buffer for an IN packet. literally that's the job — it's prepping the buffer so the IN packet can do its thing. 🔥

🧚 SEE ALSO 🧚

Kernel file ./drivers/usb/gadget/udc/udc-xilinx.c — go read it, iykyk 👑

signing off from ./drivers/usb/gadget/udc — October 2026 edition, mwah 💋✨

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