enable_audio_stream(9)

✨ enable_audio_stream(9) ✨

okay bestie, so this one is from the Kernel API Manual — section 9, kernel-flavored, very much main character energy for the USB audio girlies 💅

---

🎀 NAME 🎀

enable_audio_stream — turn on those usb snd endpoints, periodt

---

🌸 SYNOPSIS 🌸

int enable_audio_stream (struct snd_usb_substream *subs ,
snd_pcm_format_t pcm_format , unsigned int channels , unsigned int
cur_rate , int datainterval );

like literally that's the whole call signature, no cap 🫶

---

🦋 ARGUMENTS 🦋

• subs — the usb substream, aka the little guy we're working on
• pcm_format — the pcm format you're requesting (yes, exactly that one)
• channels — how many channels, count 'em
• cur_rate — the sample rate
• datainterval — the interval

---

💖 DESCRIPTION 💖

So what it does: it opens all the USB SND endpoints used for the data interface. slay.

It also increments the USB SND endpoint's opened count — tracking who's holding it open, very responsible of it ✨

It requests that the interface be kept resumed until the audio stream is stopped. like it's holding the door open for you the entire time, obsessed 😭

And it will issue the USB set interface control message to enable the data interface. that's the actual enabling part, iykyk 🔥

---

👑 SEE ALSO 👑

Kernel file: ./sound/usb/qcom/qc_audio_offload.c

• uaudio_iommu_unmap(9)
• uaudio_iommu_map_pa(9)
• uaudio_dev_intf_cleanup(9)
• uaudio_event_ring_cleanup_free(9)
• disable_audio_stream(9)
• uaudio_sideband_notifier(9)
• qmi_bye_cb(9)
• qmi_svc_disconnect_cb(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)

ngl the disable_audio_stream(9) one is right there in the list — the breakup anthem to this page's love song 💀

---

mwah 💋 that's a wrap — this page lives in ./sound/usb/qcom, stamped October 2026, and it's from the enable_audio_stream(9) era of the Kernel API Manual. go enable something, bestie 🌈⭐