STRUCT USB_UDC(9)

💖 NAME 💖

okay bestie, welcome to the struct usb_udc(9) page from the Kernel API Manual — and the whole vibe is struct usb_udc — describes one usb device controller. That's it, that's the NAME section, and yes we're keeping it cute and exact. 🎀

✨ SYNOPSIS ✨

struct usb_udc {
    struct usb_gadget_driver        *driver;
    struct usb_gadget               *gadget;
    void (*gadget_release)(struct device *dev);
    struct device                   dev;
    struct list_head                list;
    bool vbus;
    bool started;
    bool allow_connect;
    struct work_struct              vbus_work;
    struct mutex                    connect_lock;
 };

🫶 Members 🫶

• driver — the gadget driver pointer. For use by the class code. slay, noted 💅
• gadget — the gadget. For use by the class code. iconic.
• gadget_release — the gadget's release routine. no cap.
• dev — the child device to the actual controller.
• list — for use by the udc class driver.
• vbus — for udcs who care about vbus status, this value is real vbus status; for udcs who do not care about vbus status, this value is always true.
• started — the UDC's started state. True if the UDC had started.
• allow_connect — Indicates whether UDC is allowed to be pulled up. Set/cleared by gadget_(un)bind_driver after gadget driver is bound or unbound.
• vbus_work — work routine to handle VBUS status change notifications.
• connect_lock — protects udc->started, gadget->connect, gadget->allow_connect and gadget->deactivate. The routines usb_gadget_connect_locked, usb_gadget_disconnect_locked, usb_udc_connect_control_locked, usb_gadget_udc_start_locked and usb_gadget_udc_stop_locked are called with this lock held.

🌸 DESCRIPTION 🌸

okay so this represents the internal data structure which is used by the UDC-class to hold information about udc driver and gadget together. one little struct, holding the udc driver + gadget info together — bestie behavior fr fr 💖

🦋 SEE ALSO 🦋

go read these next, bestie — full list, no skips, no cap:

• Kernel file ./drivers/usb/gadget/udc/core.c
• 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(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)

okay that's the whole page, mwah 💋 — from the ./drivers/usb/gadget/udc source, October 2026, struct usb_udc(9) in the Kernel API Manual. byeeee 🦋💅