cdns3_gadget_udc_start(9)

💖 cdns3_gadget_udc_start — gadget, but make it start 💖

okay bestie, welcome to the Kernel API Manual ✨ today's main character is cdns3_gadget_udc_start, and she is literally the one who kicks the whole gadget thing off. no cap.

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🌸 SYNOPSIS 🌸

int cdns3_gadget_udc_start (struct usb_gadget *gadget , struct
       usb_gadget_driver *driver );

that's it. that's the whole flex. 🫶

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🎀 ARGUMENTS 🎀

• gadget — the gadget object itself, the whole vibe, the icon 👑
• driver — the driver that operates on this gadget, aka the one actually doing the work behind the scenes 💅

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✨ DESCRIPTION ✨

so like, what does she return? she returns 0 on success. that's it, that's the win 🎉 and if something goes sideways? error code elsewhere. not me being vague, that's genuinely what the manpage says 😭

lowkey the entire description is two clauses and honestly? she ate. minimal queen behavior. 👑

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🦋 SEE ALSO 🦋

first up, the kernel file she lives in, because we love a home address:

./drivers/usb/cdns3/cdns3-gadget.c

and now the whole friend group, no one left out, fr fr 🌈:

• cdns3_clear_register_bit(9)
• cdns3_set_register_bit(9)
• cdns3_ep_addr_to_index(9)
• cdns3_next_request(9)
• cdns3_next_align_buf(9)
• cdns3_next_priv_request(9)
• cdns3_select_ep(9)
• cdns3_get_tdl(9)
• cdns3_allocate_trb_pool(9)
• cdns3_ep_stall_flush(9)
• cdns3_hw_reset_eps_config(9)
• cdns3_ep_inc_trb(9)
• cdns3_ep_inc_enq(9)
• cdns3_ep_inc_deq(9)
• cdns3_allow_enable_l1(9)
• cdns3_start_all_request(9)
• cdns3_wa2_descmiss_copy_data(9)
• cdns3_wa2_descmissing_packet(9)
• cdns3_gadget_giveback(9)
• cdns3_ep_run_transfer(9)
• cdns3_trb_handled(9)
• cdns3_check_ep_interrupt_proceed(9)
• cdns3_check_usb_interrupt_proceed(9)
• cdns3_device_irq_handler(9)
• cdns3_device_thread_irq_handler(9)
• cdns3_ep_onchip_buffer_reserve(9)
• cdns3_ep_config(9)
• cdns3_gadget_ep_alloc_request(9)
• cdns3_gadget_ep_free_request(9)
• cdns3_gadget_ep_enable(9)
• cdns3_gadget_ep_disable(9)
• __cdns3_gadget_ep_queue(9)
• cdns3_gadget_ep_dequeue(9)
• __cdns3_gadget_ep_set_halt(9)
• __cdns3_gadget_ep_clear_halt(9)
• cdns3_gadget_ep_set_halt(9)
• cdns3_gadget_get_frame(9)
• cdns3_gadget_udc_stop(9)
• cdns3_gadget_check_config(9)
• cdns3_init_eps(9)
• cdns3_gadget_init(9)

and yes, two of those are the __-prefixed ones, __cdns3_gadget_ep_queue(9) and __cdns3_gadget_ep_set_halt(9) and __cdns3_gadget_ep_clear_halt(9) — don't @ me, that's just how they're spelled 💀

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and that's the whole page, bestie!! 🧚‍♀️💜

cute little sign-off: this one lives in the source dir ./drivers/usb/cdns3 and it's dated October 2026 ⭐ so yeah, future-coded of her. periodt. 💅🎀🌸