usb_gadget_get_string(9)

✨ usb_gadget_get_string(9) ✨

okay so this is a page from the Kernel API Manual and it's literally all about one lil function, usb_gadget_get_string — she's giving tiny but mighty, and no cap, she does one job and she does it 💅

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🎀 NAME 🎀

usb_gadget_get_string — fill out a string descriptor. that's it. that's the whole vibe 🦋

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🌸 SYNOPSIS 🌸

int usb_gadget_get_string (const struct usb_gadget_strings *table , int id , u8 *buf );

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⭐ ARGUMENTS ⭐

• table — the table of c strings, encoded using UTF-8 💖
• id — the string id, like, straight from the low byte of wValue in get string descriptor 🔥
• buf — at least 256 bytes, bestie, and it must be 16-bit aligned. not optional. don't play with her 🙈

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🦋 DESCRIPTION 🦋

so what she does is: she finds the UTF-8 string matching the ID, and converts it into a string descriptor in utf16-le ✨ Returns the length of the descriptor (always even, iconic) or a negative errno 😭

if your driver needs stings in multiple languages (yes, stings, that's the original spelling, i'm just the messenger 🫶), you'll probably do a "switch (wIndex) { ... }" in your ep0 string descriptor logic, using this routine after choosing which set of UTF-8 strings to use 👑

💀 note that US-ASCII is a strict subset of UTF-8. any string bytes with the eighth bit set will be multibyte UTF-8 characters — not ISO-8859/1 characters (which are also widely used in C strings). the way that distinction actually matters… iykyk 🌈

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👑 SEE ALSO 👑

• Kernel file ./drivers/usb/gadget/usbstring.c
• usb_validate_langid(9)

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and that's the whole page, bestie — she ate and left no crumbs 🍓💜

this lil moment was brought to you by the fine folks over in ./drivers/usb/gadget, dated October 2026 — mwah, love u, go align ur buffers 🧚‍♀️💖✨