STRUCT USB_STRING(9)

✨ struct usb_string(9) ✨

okay so bestie, welcome to the Kernel API Manual 💖 — today's main character is struct usb_string, and honestly? she's small, she's iconic, she does one job and she does it slayfully. let's get into it 🎀

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🌸 NAME 🌸

struct usb_string — literally just wraps a C string together with its USB id 🫶 lowkey the simplest glow-up in the whole gadget API and we stan

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✨ SYNOPSIS ✨

struct usb_string {
    u8 id;
    const char              *s;
 };

no cap, that's the whole struct. two fields. she's minimal, she's efficient, she's giving less is more 💅

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🦋 Members 🦋

• id — the (nonzero) ID for this string 🔢 like, it has to be nonzero, that's the vibe check, periodt
• s — the string itself, in UTF-8 encoding 🌈 keep it UTF-8 bestie, that's the whole point

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💜 Description 💜

so here's the tea ☕ — if you're using usb_gadget_get_string, then you use this lil struct to wrap a string together with its ID. that's it. that's the function. it's giving match made in heaven 🧚 — the string and its id, hand in hand, slaying together.

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🔥 SEE ALSO 🔥

the whole friend group showed up for this one, and ngl they ate 👑

Kernel file ./include/linux/usb/gadget.h, plus:

• struct usb_request(9)
• struct usb_ep_caps(9)
• struct usb_ep(9)
• free_usb_request(9)
• struct usb_gadget(9)
• usb_ep_align(9)
• usb_ep_align_maybe(9)
• gadget_is_altset_supported(9)
• gadget_is_stall_supported(9)
• gadget_is_zlp_supported(9)
• gadget_avoids_skb_reserve(9)
• gadget_is_dualspeed(9)
• gadget_is_superspeed(9)
• gadget_is_superspeed_plus(9)
• gadget_is_otg(9)
• struct usb_gadget_driver(9)
• usb_gadget_register_driver_owner(9)
• usb_gadget_unregister_driver(9)
• struct usb_gadget_strings(9)
• usb_free_descriptors(9)

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and that's the whole page bestie 💀 no filler, all substance. mwah 😘

source: ./include/linux/usb · date: October 2026 · title: struct usb_string(9) 🌟 go forth and wrap those strings, ily 🫶💖