bcm63xx_ep0_do_idle(9)

💅 bcm63xx_ep0_do_idle(9) 💅

okay hi bestie, welcome to the Kernel API Manual section for bcm63xx_ep0_do_idle — yes it's a mouthful, yes we're gonna get through it together, and yes it's giving "tiny function, huge job" energy 🎀

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✨ NAME ✨

bcm63xx_ep0_do_idle — the little function that checks if there's anything outstanding to do when ep0 is just sitting there being idle 🦋

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🌸 SYNOPSIS 🌸

int bcm63xx_ep0_do_idle (struct bcm63xx_udc *udc );

like... that's it. that's the whole signature. slay 💅

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💖 ARGUMENTS 💖

• udc — a reference to the device controller. that's your whole vibe check source right there 👑

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🔥 DESCRIPTION 🔥

so picture this: we're in state EP0_IDLE. in that state, the RX descriptor is either pending, or it's already been filled with a SETUP packet from the host. literally one or the other, no in-between, main character energy ✨

what this function does is handle the whole menu of events:

• new SETUP packets 🎀
• control IRQ events — and yes, those can generate fake SETUP packets, not me saying that, that's just the truth 😭
• reset/shutdown events 💀

and then it tells you how it went:

• returns 0 if work was done ✅
• returns -EAGAIN if there's nothing to do 🙈

periodt. no cap. that's the whole contract 🫶

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🦋 SEE ALSO 🦋

okay bestie this list is LONG, like genuinely iconic levels of long, so grab a snack 🍓 — every single one of these is in the kernel file ./drivers/usb/gadget/udc/bcm63xx_udc.c:

• struct iudma_ch_cfg(9)
• struct iudma_ch(9)
• struct bcm63xx_ep(9)
• struct bcm63xx_req(9)
• struct bcm63xx_udc(9)
• bcm63xx_ep_dma_select(9)
• bcm63xx_set_stall(9)
• bcm63xx_fifo_setup(9)
• bcm63xx_fifo_reset_ep(9)
• bcm63xx_fifo_reset(9)
• bcm63xx_ep_init(9)
• bcm63xx_ep_setup(9)
• iudma_write(9)
• iudma_read(9)
• iudma_reset_channel(9)
• iudma_init_channel(9)
• iudma_init(9)
• iudma_uninit(9)
• bcm63xx_set_ctrl_irqs(9)
• bcm63xx_select_phy_mode(9)
• bcm63xx_select_pullup(9)
• bcm63xx_uninit_udc_hw(9)
• bcm63xx_init_udc_hw(9)
• bcm63xx_ep_enable(9)
• bcm63xx_ep_disable(9)
• bcm63xx_udc_alloc_request(9)
• bcm63xx_udc_free_request(9)
• bcm63xx_udc_queue(9)
• bcm63xx_udc_dequeue(9)
• bcm63xx_udc_set_halt(9)
• bcm63xx_udc_set_wedge(9)
• bcm63xx_ep0_setup_callback(9)
• bcm63xx_ep0_spoof_set_cfg(9)
• bcm63xx_ep0_spoof_set_iface(9)
• bcm63xx_ep0_map_write(9)
• bcm63xx_ep0_complete(9)
• bcm63xx_ep0_nuke_reply(9)
• bcm63xx_ep0_read_complete(9)
• bcm63xx_ep0_internal_request(9)
• bcm63xx_ep0_do_setup(9)
• bcm63xx_ep0_one_round(9)
• bcm63xx_ep0_process(9)
• bcm63xx_udc_get_frame(9)
• bcm63xx_udc_pullup(9)
• bcm63xx_udc_start(9)
• bcm63xx_udc_stop(9)
• bcm63xx_update_cfg_iface(9)
• bcm63xx_update_link_speed(9)
• bcm63xx_update_wedge(9)
• bcm63xx_udc_ctrl_isr(9)
• bcm63xx_udc_data_isr(9)
• bcm63xx_udc_init_debugfs(9)
• bcm63xx_udc_cleanup_debugfs(9)
• bcm63xx_udc_probe(9)
• bcm63xx_udc_remove(9)

iykyk 😌💜

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🌈 sign-off 🌈

that's the whole page bestie!! this one lives over in ./drivers/usb/gadget/udc, dated October 2026, and honestly? she ate 💅✨ go read the source, drink some water, and remember: -EAGAIN just means "nothing to do," not "nothing to be." 🫶🌸🎀