usb_string_ids_n(9)

🌸 NAME 🌸

okay so bestie, welcome to the usb_string_ids_n(9) page from the Kernel API Manual 💖 — it's literally “allocate unused string IDs in batch” and it's giving efficient little helper energy ✨.

✨ SYNOPSIS ✨

int usb_string_ids_n (struct usb_composite_dev *c , unsigned n );

🎀 ARGUMENTS 🎀

• c — the device whose string descriptor IDs are being allocated 💅
• n — number of string IDs to allocate 🔢

🧚 CONTEXT 🧚

single threaded during gadget setup 🧵 — so do not come in here with concurrency chaos, bestie.

💅 DESCRIPTION 💅

Returns the first requested ID 💖. This ID and the next n-1 IDs are now valid IDs. At least, provided that n is non-zero — because if it is zero, it returns the last requested ID, which is now very useful information, fr fr.

usb_string_ids_n is called from bind callbacks to allocate string IDs. Drivers for functions, configurations, or gadgets will then store that ID in the appropriate descriptors and string table. 🛠️✨

🚨 Bestie, please do not freestyle string IDs: all string identifier should be allocated using this, usb_string_id or usb_string_ids_n routine, to ensure that for example different functions don't wrongly assign different meanings to the same identifier.

👀 SEE ALSO 👀

Kernel file ./drivers/usb/gadget/composite.c — go peek, it's iconic 👑

• struct usb_os_string(9)
• function_descriptors(9)
• next_desc(9)
• config_ep_by_speed_and_alt(9)
• config_ep_by_speed(9)
• usb_add_function(9)
• usb_function_deactivate(9)
• usb_function_activate(9)
• usb_interface_id(9)
• usb_func_wakeup(9)
• bos_desc(9)
• usb_add_config(9)
• usb_string_id(9)
• usb_string_ids_tab(9)
• usb_gstrings_attach(9)
• usb_composite_probe(9)
• usb_composite_unregister(9)
• usb_composite_setup_continue(9)

byeee 🫶 — source/version footer: ./drivers/usb/gadget, date: October 2026, page: usb_string_ids_n(9) 💖