pxa27x_change_interface(9)

💅 pxa27x_change_interface(9) — like, the Kernel API Manual bestie ✨

okay so bestie, let me put you on to pxa27x_change_interface from the Kernel API Manual 📖 — this one's a whole vibe, and it's giving "quietly essential USB glue function" energy. no cap, she's not flashy but she works. 🫶

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🌸 NAME 🌸

pxa27x_change_interface — this is literally the function that handles the SET_INTERF usb request notification, periodt. 💅 like that's her whole job, and she does it.

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✨ SYNOPSIS ✨

void pxa27x_change_interface (struct pxa_udc *udc , int iface , int alt );

three args, one void return, zero drama. iconic. 👑

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🎀 ARGUMENTS 🎀

• udc — the udc device itself, the main character of this whole saga 💖
• iface — the interface number, aka which interface we're talking about fr fr
• alt — the alternate setting number, the "alt" in question, lowkey crucial 🌈

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🦋 DESCRIPTION 🦋

so what does she actually do? simple: she posts the request up to the upper level. that's it. that's the tweet. 🐦

⚠️ but bestie listen—don't use any pxa specific hardware configuration capabilities here. seriously. this function is NOT the place for your pxa hardware tricks. hands off the hardware config, iykyk. 🙈💀

like, she's just the messenger passing the request upstairs. no pxa-specific hardware nonsense, no extra meddling. keep it clean. ✨

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💜 SEE ALSO 💜

okay this is the part where the entourage shows up 😭 and trust, the squad is massive. these all live in the kernel file ./drivers/usb/gadget/udc/pxa27x_udc.c and honestly they ate:

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), 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), 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)

no i did NOT skip any of them, don't even try me 😤💅 that's the whole roster, every single one, slay.

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🌸✨ and that's the whole page bestie! ✨🌸

this lil gem lives in ./drivers/usb/gadget/udc and it's dated October 2026 🗓️ — so mark your calendar, she's a whole era. and the manual itself is part of the pxa27x_change_interface(9) Kernel API Manual, the one and only. 💖

later bestie, go handle those SET_INTERF requests responsibly 🫶🎀🦋⭐