ENUM USB_CHG_STATE(9)

💅 enum usb_chg_state(9) 💅

okay bestie, welcome to the Kernel API Manual page for enum usb_chg_state(9). the vibe? different states involved in USB charger detection. no cap, it’s a whole little enum era ✨

🌸 NAME 🌸

enum usb_chg_state — Different states involved in USB charger detection.

✨ SYNOPSIS ✨

enum usb_chg_state {
    USB_CHG_STATE_UNDEFINED ,
    USB_CHG_STATE_WAIT_FOR_DCD ,
    USB_CHG_STATE_DCD_DONE ,
    USB_CHG_STATE_PRIMARY_DONE ,
    USB_CHG_STATE_SECONDARY_DONE ,
    USB_CHG_STATE_DETECTED

};

she’s giving “state machine but make it cute,” and honestly? iconic 🎀

🧚 Constants 🧚

here’s the squad, one by one:

• USB_CHG_STATE_UNDEFINED — USB charger is not connected or detection process is not yet started. basically: no charger, or we haven’t even begun the detection process yet.
• USB_CHG_STATE_WAIT_FOR_DCD — Waiting for Data pins contact. yes bestie, Data pins contact — that’s the whole mood rn.
• USB_CHG_STATE_DCD_DONE — Data pin contact is detected. slay, contact made 💅
• USB_CHG_STATE_PRIMARY_DONE — Primary detection is completed (Detects between SDP and DCP/CDP). iykyk — SDP vs DCP/CDP is the tea 🍓
• USB_CHG_STATE_SECONDARY_DONE — Secondary detection is completed (Detects between DCP and CDP). another round of “which one is it?” energy, fr fr.
• USB_CHG_STATE_DETECTED — USB charger type is determined. periodt. the charger type has been figured out 👑

🦋 SEE ALSO 🦋

okay so if you want the lore, check the Kernel file ./drivers/phy/rockchip/phy-rockchip-inno-usb2.c and these iconic structs:

• struct rockchip_chg_det_reg(9)
• struct rockchip_usb2phy_port_cfg(9)
• struct rockchip_usb2phy_cfg(9)
• struct rockchip_usb2phy_port(9)
• struct rockchip_usb2phy(9)

that’s the whole page, bestie 🫶 source/version: ./drivers/phy/rockchip · date: October 2026. mwah 💋