typec_port_register_altmode(9)

💖 typec_port_register_altmode(9) 💖

okay so bestie, welcome to the Kernel API Manual — yes, that's the manual name, and yes, you're gonna get through this, i promise 🫶 this one's all about registering an Alternate Mode on a USB Type-C port, and honestly? it's giving "small function, big responsibility." let's get into it ✨

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🌸 NAME 🌸

typec_port_register_altmode — Register USB Type-C Port Alternate Mode 👑

like, it's literally the function that puts your alternate mode on the map. main character energy fr fr.

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✨ SYNOPSIS ✨

struct typec_altmode * typec_port_register_altmode (struct typec_port
*port , const struct typec_altmode_desc *desc );

look at that signature. gorgeous. no cap 🎀

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🦋 ARGUMENTS 🦋

• port — the USB Type-C Port that supports the alternate mode. this is your homegirl right here — the port that's down to support the alt mode 💅
• desc — the Description of the alternate mode. all the deets, packaged up in a struct typec_altmode_desc 🌈

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💜 DESCRIPTION 💜

okay so here's the tea 🍓 this routine is used to register an alternate mode that port is capable of supporting. that's it. that's the whole job. and it ate, honestly.

Returns a handle to the alternate mode on success, or ERR_PTR on failure 😭 — so like, always check it, bestie, don't just raw-dog the return value, i'm begging you 🙈

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👑 SEE ALSO 👑

the lore is deep, so here's the whole friend group — plus the kernel file they all live in:

Kernel file ./drivers/usb/typec/class.c

• typec_altmode_update_active(9)
• typec_altmode2port(9)
• typec_altmode_set_ops(9)
• typec_unregister_altmode(9)
• typec_partner_set_usb_mode(9)
• typec_partner_set_identity(9)
• typec_partner_set_pd_revision(9)
• typec_partner_set_usb_power_delivery(9)
• typec_partner_set_num_altmodes(9)
• typec_partner_register_altmode(9)
• typec_partner_set_svdm_version(9)
• typec_partner_usb_power_delivery_register(9)
• typec_register_partner(9)
• typec_unregister_partner(9)
• typec_plug_set_num_altmodes(9)
• typec_plug_register_altmode(9)
• typec_register_plug(9)
• typec_unregister_plug(9)
• typec_cable_get(9)
• typec_cable_put(9)
• typec_cable_is_active(9)
• typec_cable_altmode_unsupported(9)
• typec_cable_set_identity(9)
• typec_register_cable(9)
• typec_unregister_cable(9)
• typec_port_set_usb_mode(9)
• typec_port_set_usb_power_delivery(9)
• typec_set_data_role(9)
• typec_get_data_role(9)
• typec_set_pwr_role(9)
• typec_set_vconn_role(9)
• typec_set_pwr_opmode(9)
• typec_find_pwr_opmode(9)
• typec_find_orientation(9)
• typec_find_port_power_role(9)
• typec_find_power_role(9)
• typec_find_port_data_role(9)
• typec_set_orientation(9)
• typec_get_orientation(9)
• typec_set_mode(9)
• typec_get_negotiated_svdm_version(9)
• typec_get_cable_svdm_version(9)
• typec_cable_set_svdm_version(9)
• typec_get_drvdata(9)
• typec_port_register_cable_ops(9)
• typec_register_port(9)
• typec_unregister_port(9)

like, that's a whole squad 😭 go read them, iykyk 💀

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that's the whole page, bestie — go forth and register those alternate modes 💅✨

signing off from ./drivers/usb/typec, dated October 2026, this was typec_port_register_altmode(9) — mwah, ily, bye 🎀💖