dplus_pullup(9)

✨ NAME ✨

dplus_pullup — connect or disconnect pullup resistor to D+ pin. You're in the dplus_pullup(9) page from the Kernel API Manual, bestie 💖

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🦋 SYNOPSIS 🦋

void dplus_pullup (struct pxa_udc *udc , int on );

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🎀 ARGUMENTS 🎀

• udc — udc device. Like, the udc device in question.
• on — 0 if disconnect pullup resistor, 1 otherwise.

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🌈 CONTEXT 🌈

any — no context restrictions listed, so it's giving flexible ✨

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💅 DESCRIPTION 💅

Okay so this handles the D+ pullup resistor: it makes the device visible to the usb bus, and declares it as a full speed usb device. That's the whole slay 🫶

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👑 SEE ALSO 👑

Kernel file ./drivers/usb/gadget/udc/pxa27x_udc.c is linked up with the whole crew: 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), 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), 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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Source/version: ./drivers/usb/gadget/udc · Date: October 2026 · Page: dplus_pullup(9) — that's the whole footer vibe, mwah 💋🫶