xudc_ep0_enable(9)

💅 xudc_ep0_enable — bestie, this one's a traps

okay so welcome to xudc_ep0_enable(9), straight out of the Kernel API Manual ✨ no cap, this is a short one but the plot twist is iconic.

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🌸 NAME 🌸

xudc_ep0_enable — enables the given endpoint. that's the whole pitch. that's what it says it does. keep reading tho 👀

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🎀 SYNOPSIS 🎀

int xudc_ep0_enable (struct usb_ep *ep , const struct
       usb_endpoint_descriptor *desc );

two args, one int coming back at you. the line break in the middle? that's just the manpage being dramatic, she's fine 🫶

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🦋 ARGUMENTS 🦋

• ep — pointer to the usb endpoint structure. like, the endpoint herself. the main character.
• desc — pointer to the usb_endpoint_descriptor. her paperwork. her whole entire vibe description.

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💀 RETURN 💀

error. always.

not "sometimes". not "on a bad day". always. it's giving "the function said no before you even asked" 😭 the return value is an error, periodt.

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🔥 DESCRIPTION 🔥

okay so here's the tea: endpoint 0 enable should not be called by the gadget layer.

that's it. that's the whole description. it exists solely to tell you don't. it's a please do not do this with a function signature. do not call it from the gadget layer, bestie, fr fr 🙈

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💜 SEE ALSO 💜

grab a snack, this list is long, she ate and left no crumbs 👑

Kernel file ./drivers/usb/gadget/udc/udc-xilinx.c

• struct xusb_req(9)
• struct xusb_ep(9)
• struct xusb_udc(9)
• xudc_write32(9)
• xudc_read32(9)
• xudc_write32_be(9)
• xudc_read32_be(9)
• xudc_wrstatus(9)
• xudc_epconfig(9)
• xudc_start_dma(9)
• xudc_dma_send(9)
• xudc_dma_receive(9)
• xudc_eptxrx(9)
• xudc_done(9)
• xudc_read_fifo(9)
• xudc_write_fifo(9)
• xudc_nuke(9)
• xudc_ep_set_halt(9)
• __xudc_ep_enable(9)
• xudc_ep_enable(9)
• xudc_ep_disable(9)
• xudc_ep_alloc_request(9)
• xudc_free_request(9)
• __xudc_ep0_queue(9)
• xudc_ep0_queue(9)
• xudc_ep_queue(9)
• xudc_ep_dequeue(9)
• xudc_ep0_disable(9)
• xudc_get_frame(9)
• xudc_wakeup(9)
• xudc_pullup(9)
• xudc_eps_init(9)
• xudc_stop_activity(9)
• xudc_start(9)
• xudc_stop(9)
• xudc_clear_stall_all_ep(9)
• xudc_startup_handler(9)
• xudc_ep0_stall(9)
• xudc_setaddress(9)
• xudc_getstatus(9)
• xudc_set_clear_feature(9)
• xudc_handle_setup(9)
• xudc_ep0_out(9)
• xudc_ep0_in(9)
• xudc_ctrl_ep_handler(9)
• xudc_nonctrl_ep_handler(9)
• xudc_irq(9)
• xudc_probe(9)
• xudc_remove(9)

like I said. a lot. but honestly? every single one of them is worth a look, iykyk 💅

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lowkey reminder before you go: this returns error always, and endpoint 0 enable is a gadget-layer no-no. don't be the one who tries it anyway, I'm begging 🥺

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and that's the page, bestie!! 🍓 this iconic little entry lives in ./drivers/usb/gadget/udc, dated October 2026, brought to you by the Kernel API Manual — mwah, take care of her 💖✨🎀