pxa27x_udc_start(9)

💖 pxa27x_udc_start(9) 💖

okay bestie, welcome to the Kernel API Manual entry for pxa27x_udc_start(9) — manual name folded right in here, no boring header line needed. This is the “register gadget driver” moment, and we’re reading it together like the group chat is watching. 💅

🌸 NAME 🌸

pxa27x_udc_start — Register gadget driver. That’s the name, and it ate. ✨

✨ SYNOPSIS ✨

int pxa27x_udc_start (struct usb_gadget *g , struct usb_gadget_driver
       *driver );

🎀 ARGUMENTS 🎀

• g — gadget. The gadget itself, no cap. 🦋
• driver — gadget driver. The driver doing the gadget thing. 🎀

💅 DESCRIPTION 💅

okay so here’s the tea: when a driver is successfully registered, it will receive control requests including set_configuration, which enables non-control requests. Then usb traffic follows until a disconnect is reported. Then a host may connect again, or the driver might get unbound. Literally the whole lifecycle vibe. 💫

Quick note bestie — the udc is not automatically enabled. Check function should_enable_udc. Do not skip that, bestie, it’s giving important. 🙈

Return value check: Returns 0 if no error, -EINVAL, -ENODEV, -EBUSY otherwise. Periodt. 💅

🌈 SEE ALSO 🌈

Kernel file ./drivers/usb/gadget/udc/pxa27x_udc.c and the whole cross-ref squad: is_match_usb_pxa(9), find_pxa_ep(9), update_pxa_ep_matches(9), pio_irq_enable(9), pio_irq_disable(9), udc_set_mask_UDCCR(9), udc_clear_mask_UDCCR(9), ep_write_UDCCSR(9), ep_count_bytes_remain(9), ep_is_empty(9), ep_is_full(9), epout_has_pkt(9), set_ep0state(9), ep0_idle(9), inc_ep_stats_reqs(9), inc_ep_stats_bytes(9), pxa_ep_setup(9), pxa_eps_setup(9), pxa_ep_alloc_request(9), pxa_ep_free_request(9), ep_add_request(9), ep_del_request(9), req_done(9), ep_end_out_req(9), ep0_end_out_req(9), ep_end_in_req(9), ep0_end_in_req(9), nuke(9), read_packet(9), write_packet(9), read_fifo(9), write_fifo(9), read_ep0_fifo(9), write_ep0_fifo(9), pxa_ep_queue(9), pxa_ep_dequeue(9), pxa_ep_set_halt(9), pxa_ep_fifo_status(9), pxa_ep_fifo_flush(9), pxa_ep_enable(9), pxa_ep_disable(9), dplus_pullup(9), pxa_udc_get_frame(9), pxa_udc_wakeup(9), should_enable_udc(9), should_disable_udc(9), pxa_udc_pullup(9), pxa_udc_vbus_session(9), pxa_udc_vbus_draw(9), pxa_udc_phy_event(9), udc_disable(9), udc_init_data(9), udc_enable(9), stop_activity(9), pxa27x_udc_stop(9), handle_ep0_ctrl_req(9), handle_ep0(9), handle_ep(9), pxa27x_change_configuration(9), pxa27x_change_interface(9), irq_udc_suspend(9), irq_udc_resume(9), irq_udc_reconfig(9), irq_udc_reset(9), pxa_udc_irq(9), pxa_udc_probe(9), pxa_udc_remove(9), pxa_udc_suspend(9), pxa_udc_resume(9).

mwah 💋 — source/version: ./drivers/usb/gadget/udc · date: October 2026. Stay hydrated and may your gadgets always register on the first try 🫶