usb_decode_interval(9)

✨ usb_decode_interval(9) ✨

okay so bestie, welcome to the Kernel API Manual 💖 this one lives in the USB corner of the kernel and it's genuinely so useful, no cap.

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🎀 NAME 🎀

usb_decode_interval — literally decodes bInterval into the time expressed in 1us unit. that's it, that's the whole gig 💅

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🌸 SYNOPSIS 🌸

unsigned int usb_decode_interval (const struct usb_endpoint_descriptor
*epd , enum usb_device_speed speed );

bestie look at that return type — unsigned int, we love a whole number ✨

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🦋 ARGUMENTS 🦋

• epd — the descriptor of the endpoint 💌 like, the actual struct usb_endpoint_descriptor for the endpoint you're curious about.
• speed — the speed that the endpoint works as 🏃‍♀️ it's an enum usb_device_speed, and yes it matters because the decoding depends on it.

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🍓 DESCRIPTION 🍓

so the function returns the interval expressed in 1us unit for servicing the endpoint for data transfers 🫶 that's the vibe. you hand it the endpoint descriptor plus the speed, it hands you back a nice little number telling you how often that endpoint wants attention, measured in 1us units. iconic behaviour honestly 👑

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💜 SEE ALSO 💜

• the kernel file ./drivers/usb/common/common.c — that's where this cutie lives 🏠
• usb_ep_type_string(9)
• usb_otg_state_string(9)
• usb_speed_string(9)
• usb_get_maximum_speed(9)
• usb_get_maximum_ssp_rate(9)
• usb_state_string(9)
• usb_get_dr_mode_from_string(9)
• usb_get_role_switch_default_mode(9)
• of_usb_get_dr_mode_by_phy(9)
• of_usb_host_tpl_support(9)
• of_usb_update_otg_caps(9)
• usb_of_get_companion_dev(9)

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ngl if you're digging around in USB endpoint timing this is your moment, go read the friends above too 💀🌸

k byeee, this page was served fresh from ./drivers/usb/common and dated October 2026 🎀 catch you in the next manpage bestie 😭💖