uaudio_sideband_notifier(9)

💜 uaudio_sideband_notifier(9) — the kernel API manual, but make it make sense

okay so bestie, welcome to the uaudio_sideband_notifier(9) page 🎀 this is the Kernel API Manual entry and honestly it's short, sweet, and kind of iconic. let's get into it ✨

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🌸 NAME 🌸

uaudio_sideband_notifier — the xHCI sideband event handler 💅 that's it, that's the whole vibe.

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⭐ SYNOPSIS ⭐

int uaudio_sideband_notifier (struct usb_interface *intf , struct xhci_sideband_event *evt );

look at her go 🫶 two arguments, returns an int, no notes.

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🦋 ARGUMENTS 🦋

• intf — your USB interface handle 💖 like, this is which interface we're talking about, okay? pls don't lose it.
• evt — the xHCI sideband event type 🌈 i.e. what kind of sideband situation we're dealing with.

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✨ DESCRIPTION ✨

so this callback runs when the xHCI sideband hits a sequence that needs the sideband clients to, like, do something 👀 it's a "hey bestie, heads up, act now" situation.

the example given — and it's a real one, not me guessing — is when xHCI frees the transfer ring 🌀 at that point the client has to make sure the offload path is halted. no cap. if you skip that, things get weird, and not in a fun way 😭

this is a callback, so you don't call it — the kernel comes for you when the sideband needs you. be ready 💀

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🔥 SEE ALSO 🔥

the kernel file lives at ./sound/usb/qcom/qc_audio_offload.c 👑

and here's the whole friend group, all of them, in order, no one left behind 🫶:

• uaudio_iommu_unmap(9)
• uaudio_iommu_map_pa(9)
• uaudio_dev_intf_cleanup(9)
• uaudio_event_ring_cleanup_free(9)
• disable_audio_stream(9)
• qmi_bye_cb(9)
• qmi_svc_disconnect_cb(9)
• enable_audio_stream(9)
• uaudio_transfer_buffer_setup(9)
• uaudio_endpoint_setup(9)
• uaudio_event_ring_setup(9)
• uaudio_populate_uac_desc(9)
• prepare_qmi_response(9)
• handle_uaudio_stream_req(9)
• qc_usb_audio_offload_init_qmi_dev(9)
• qc_usb_audio_offload_probe(9)
• qc_usb_audio_cleanup_qmi_dev(9)
• qc_usb_audio_offload_disconnect(9)
• qc_usb_audio_offload_suspend(9)

like, that's a stack of reading material. go read them, iykyk 💜

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and that's the page, bestie 🎀 this one came from ./sound/usb/qcom, dated October 2026 — so mark your calendar, screenshot it, send it to the group chat, periodt 💅🌸