usb_enumerate_device(9)

💅 usb_enumerate_device 💅

okay so like — heads up bestie, this is a page from the Kernel API Manual, and we're talking about usb_enumerate_device(9) today. buckle up 🎀

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✨ NAME ✨

usb_enumerate_device — reads device configs/intfs/otg (and yes, it's usbcore-internal, so it's giving "for internal use only" energy 🫶)

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🌸 SYNOPSIS 🌸

int usb_enumerate_device (struct usb_device *udev );

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🦋 ARGUMENTS 🦋

• udev — the newly addressed device, and it's chillin' in ADDRESS state ✨ (that's the state, literally, don't come for me)

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💖 DESCRIPTION 💖

So here's the tea: this function is only called by usb_new_device — like, that's its whole social circle. and every comment that applies over there? applies here too, wrt the environment. no cap. 🫶

okay and IMPORTANT: if the device is WUSB and it is not authorized, we do not attempt to read the string descriptors. why? because they will be errored out by the device until it has been authorized. literally it will just fail at you 💀 so we don't even try. respect the boundaries, bestie.

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⭐ RETURN ⭐

• 0 if successful 🎉
• a negative error code otherwise 😭

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🧚 SEE ALSO 🧚

kernel file ./drivers/usb/core/hub.c and honestly the whole friend group:

• usb_hub_set_port_power(9)
• usb_hub_clear_tt_buffer(9)
• usb_remove_device(9)
• usb_set_device_state(9)
• usb_disconnect(9)
• usb_enumerate_device_otg(9)
• usb_new_device(9)
• usb_deauthorize_device(9)
• get_port_ssp_rate(9)
• usb_root_hub_lost_power(9)
• hub_hc_release_resources(9)
• usb_reset_and_verify_device(9)
• usb_reset_device(9)
• usb_queue_reset_device(9)
• usb_hub_find_child(9)
• usb_get_hub_port_acpi_handle(9)

like, the whole squad. go read them. iykyk 👑

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fr fr though — this is an internal usbcore thing, so don't go calling it from your random driver like it's a main character. it's not. 💅

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keep slaying, bestie 💜 this one lives in ./drivers/usb/core, and it's dated October 2026 — yes, the future, we're iconic like that. periodt. 🌈⭐🍓