pxa_udc_pullup(9)

🎀 NAME 🎀

pxa_udc_pullup — bestie, this one gives you manual D+ pullup control 💅

(it lives in the Kernel API Manual, and it's lowkey iconic for exactly one job: flipping that resistor.)

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✨ SYNOPSIS ✨

int pxa_udc_pullup (struct usb_gadget *_gadget , int is_active );

🫶 ARGUMENTS 🫶

• _gadget — the usb gadget that's using this control 🦋
• is_active — 0 means disconnect; literally anything else means connect the D+ pullup resistor. Not me being dramatic, that's just the deal 💀

🌸 CONTEXT 🌸

Task context — and heads up, it might sleep 😴 so don't go calling it from somewhere rude.

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💖 DESCRIPTION 💖

It returns 0 if everything's OK ✨ — and -EOPNOTSUPP if the udc driver doesn't handle D+ pullup at all. Like, it just doesn't do that, sorry babe 🙈

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👑 SEE ALSO 👑

The kernel file ./drivers/usb/gadget/udc/pxa27x_udc.c is the main character here, and these are the whole friend group, no cap:

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_vbus_session(9), pxa_udc_vbus_draw(9), pxa_udc_phy_event(9), udc_disable(9), udc_init_data(9), udc_enable(9), pxa27x_udc_start(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)

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okay that's the whole page, you ate that 🍓

and lastly, the cute little sign-off: this one's from ./drivers/usb/gadget/udc, dated October 2026 — periodt 💜🦋