STRUCT OTG_SWITCH_MTK(9)

🎀 struct otg_switch_mtk(9) 🎀

okay so bestie, this one's straight out of the Kernel API Manual and it's genuinely the main character of USB OTG/dual-role switching 💅 like this struct is the whole group chat that keeps host mode and device mode from fighting in the school parking lot.

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✨ NAME ✨

struct otg_switch_mtk — OTG/dual-role switch management. that's it, that's the vibe: it manages the switch. no cap 🫶

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🌸 SYNOPSIS 🌸

struct otg_switch_mtk {
    struct regulator *vbus;
    struct extcon_dev *edev;
    struct notifier_block id_nb;
    struct work_struct dr_work;
    enum usb_role desired_role;
    enum usb_role default_role;
    struct usb_role_switch *role_sw;
    bool role_sw_used;
    bool is_u3_drd;
    bool manual_drd_enabled;
 };

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💖 Members 💖

meet the cast, they all ate fr fr:

• vbus — the vbus 5V that host mode uses. give it its flowers ⚡
• edev — the external connector used to detect vbus and iddig changes. it's the one watching the door 👀
• id_nb — the notifier for iddig (idpin) detection. tiny little heads-up machine 🎀
• dr_work — the work for the drd mode switch, and it exists specifically to avoid sleep in atomic context. lowkey a hero for that 😭
• desired_role — the role you desire to switch to. yes, that's literally the name, and honestly? iconic.
• default_role — the default mode while the usb role is USB_ROLE_NONE. the fallback bestie 💜
• role_sw — uses USB Role Switch to support dual-role switch. important lore: it can't use extcon at the same time, and extcon is deprecated. so like… don't 🙈

heads up bestie: extcon is deprecated here. that's not me being dramatic, that's just the facts 💀

• role_sw_used — true when the USB Role Switch is used. simple, honest, slays ✨
• is_u3_drd — whether port0 supports usb3.0 dual-role device or not. a yes/no girlie 🌈
• manual_drd_enabled — it's true when it supports dual-role device by debugfs to switch host/device modes depending on user input. you get to drive, bestie 🚗

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🦋 SEE ALSO 🦋

start with the kernel file ./drivers/usb/mtu3/mtu3.h, then the whole friend group showing up in the mentions 🔥

• enum mtu3_g_ep0_state(9)
• enum mtu3_dr_force_mode(9)
• struct mtu3_fifo_info(9)
• struct qmu_gpd(9)
• struct mtu3_gpd_ring(9)
• struct ssusb_mtk(9)
• struct mtu3_ep(9)
• struct mtu3(9)

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⭐ that's the whole page, no notes, and it lives in ./drivers/usb/mtu3 with the October 2026 energy 🗓️💖 periodt, go read the source bestie, mwah 🫶✨