udc_start(9)

🌸 NAME 🌸

udc_start — initialize gadget role

okay bestie, this is udc_start(9) from the Kernel API Manual, and it's literally the moment where the gadget role gets initialized. slay. ✨

✨ SYNOPSIS ✨

int udc_start (struct ci_hdrc *ci );

ngl, it returns an int and takes exactly one very specific pointer: a struct ci_hdrc * named ci. main character energy only. 💅

🎀 ARGUMENTS 🎀

• ci — the chipidea controller. that's it, that's the whole argument, and she's iconic. 👑

🦋 SEE ALSO 🦋

If you wanna go down the rabbit hole (and you do), the kernel file is ./drivers/usb/chipidea/udc.c, and these functions are all linked in the group chat:

• hw_ep_bit(9)
• hw_device_state(9)
• hw_ep_flush(9)
• hw_ep_disable(9)
• hw_ep_enable(9)
• hw_ep_get_halt(9)
• hw_ep_prime(9)
• hw_ep_set_halt(9)
• hw_port_is_high_speed(9)
• hw_test_and_clear_complete(9)
• hw_test_and_clear_intr_active(9)
• hw_test_and_clear_setup_guard(9)
• hw_test_and_set_setup_guard(9)
• hw_usb_set_address(9)
• hw_usb_reset(9)
• _usb_addr(9)
• _hardware_enqueue(9)
• free_pending_td(9)
• _hardware_dequeue(9)
• _ep_nuke(9)
• _gadget_stop_activity(9)
• isr_reset_handler(9)
• isr_get_status_complete(9)
• _ep_queue(9)
• isr_get_status_response(9)
• isr_setup_status_complete(9)
• isr_setup_status_phase(9)
• isr_tr_complete_low(9)
• isr_setup_packet_handler(9)
• isr_tr_complete_handler(9)
• ci_udc_start(9)
• udc_stop(9)
• ci_hdrc_gadget_init(9)

source/version vibe check: ./drivers/usb/chipidea · date: October 2026 · and that's the whole page, bestie. periodt. 💖🫶