usb_add_gadget(9)

💖 usb_add_gadget(9) 💖

okay so bestie, welcome to the Kernel API Manual, section 9, and today's main character is usb_add_gadget ✨ like yes, that's the whole name, we didn't even need a fancy subtitle, it literally does what it says 🫶

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🌸 NAME 🌸

usb_add_gadget — adds a new gadget to the udc class driver list 💅

no cap, that's the entire job description. it puts your gadget on the list. iconic behaviour, honestly.

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✨ SYNOPSIS ✨

int usb_add_gadget (struct usb_gadget *gadget );

that's it. that's the whole vibe. one function, one pointer, one int coming back at you 🎀

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🦋 ARGUMENTS 🦋

• gadget — the gadget to be added to the list. this is your gadget, the one you're introducing to the group chat 📋💖

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🔥 DESCRIPTION 🔥

so here's the tea ☕ — it returns zero on success, and a negative errno otherwise. that's the classic Unix glow-up: 0 means slay, anything negative means something went sideways 😭

⚠️ and listen, this part matters: it does not do a final usb_put_gadget if an error occurs. read that again, bestie. if it fails, the cleanup is your problem, not the function's. no refunds, no takebacks, no free usb_put_gadget on the way out 💀

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🧚 SEE ALSO 🧚

like a whole friend group, fr fr — go say hi to all of them 👑

• Kernel file ./drivers/usb/gadget/udc/core.c
• struct usb_udc(9)
• usb_ep_set_maxpacket_limit(9)
• usb_ep_enable(9)
• usb_ep_disable(9)
• usb_ep_alloc_request(9)
• usb_ep_free_request(9)
• usb_ep_queue(9)
• usb_ep_dequeue(9)
• usb_ep_set_halt(9)
• usb_ep_clear_halt(9)
• usb_ep_set_wedge(9)
• usb_ep_fifo_status(9)
• usb_ep_fifo_flush(9)
• usb_gadget_frame_number(9)
• usb_gadget_wakeup(9)
• usb_gadget_set_remote_wakeup(9)
• usb_gadget_set_selfpowered(9)
• usb_gadget_clear_selfpowered(9)
• usb_gadget_vbus_connect(9)
• usb_gadget_vbus_draw(9)
• usb_gadget_vbus_disconnect(9)
• usb_gadget_connect(9)
• usb_gadget_disconnect(9)
• usb_gadget_deactivate(9)
• usb_gadget_activate(9)
• usb_gadget_giveback_request(9)
• gadget_find_ep_by_name(9)
• usb_gadget_check_config(9)
• usb_udc_vbus_handler(9)
• usb_gadget_udc_reset(9)
• usb_gadget_udc_start_locked(9)
• usb_gadget_udc_stop_locked(9)
• usb_gadget_udc_set_speed(9)
• usb_gadget_enable_async_callbacks(9)
• usb_gadget_disable_async_callbacks(9)
• usb_udc_release(9)
• usb_initialize_gadget(9)
• usb_add_gadget_udc_release(9)
• usb_get_gadget_udc_name(9)
• usb_add_gadget_udc(9)
• usb_del_gadget(9)
• usb_del_gadget_udc(9)

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and that's the whole page, bestie 🎀 sourced fresh from ./drivers/usb/gadget/udc, dated October 2026 — go forth and add your gadget, you absolute legend 👑💜