typec_altmode_vdm(9)

💅 NAME 💅

okay so bestie, this is typec_altmode_vdm(9) from the Kernel API Manual — the page for the function that sends Vendor Defined Messages (VDM) to the partner 🫶

typec_altmode_vdm — Send Vendor Defined Messages (VDM) to the partner 💌

✨ SYNOPSIS ✨

here’s the signature, no cap, copy it exactly:

int typec_altmode_vdm (struct typec_altmode *adev , const u32 header ,
       const u32 *vdo , int count );

🎀 ARGUMENTS 🎀

• adev — Alternate mode handle. your main character pointer ✨
• header — VDM Header. the header bestie 💅
• vdo — Array of Vendor Defined Data Objects. yes, an array, not a single object 👑
• count — Number of Data Objects. how many Data Objects are in the array 🔢

🌸 DESCRIPTION 🌸

The alternate mode drivers use this function for SVID specific communication with the partner. 💬 The port drivers use it to deliver the Structured VDMs received from the partners to the alternate mode drivers. 🚚✨

that’s the whole vibe: alt-mode drivers talk SVID-specific stuff to the partner, and port drivers pass those Structured VDMs along to the alternate mode drivers. no extra lore, just facts 💖

🦋 SEE ALSO 🦋

Kernel file ./drivers/usb/typec/bus.c is part of this little friend group too:

• typec_altmode_notify(9)
• typec_altmode_enter(9)
• typec_altmode_exit(9)
• typec_altmode_attention(9)
• typec_cable_altmode_enter(9)
• typec_cable_altmode_exit(9)
• typec_cable_altmode_vdm(9)
• typec_altmode_get_plug(9)
• typec_altmode_put_plug(9)
• typec_match_altmode(9)

source/version line: ./drivers/usb/typec · date: October 2026 · page: typec_altmode_vdm(9) — that’s the footer, bestie, mwah! 💋🫶