STRUCT SINK_CAPS_EXT_MSG(9)

💅 struct sink_caps_ext_msg(9) — the kernel API manual, bestie edition ✨

okay so this is a page from the Kernel API Manual, section 9, and it's all about one very specific little struct 🎀

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🌸 NAME 🌸

struct sink_caps_ext_msg — the Sink extended capability PD message. That's it, that's the whole vibe. It's the struct that carries a sink's extended capability info as a Power Delivery message 💖

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✨ SYNOPSIS ✨

struct sink_caps_ext_msg {
    __le16 vid;
    __le16 pid;
    __le32 xid;
    u8 fw;
    u8 hw;
    u8 skedb_ver;
    u8 load_step;
    __le16 load_char;
    u8 compliance;
    u8 touch_temp;
    u8 batt_info;
    u8 modes;
    u8 spr_min_pdp;
    u8 spr_op_pdp;
    u8 spr_max_pdp;
    u8 epr_min_pdp;
    u8 epr_op_pdp;
    u8 epr_max_pdp;
 };

like, that's the whole layout right there, no cap 👑

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🫶 Members 🫶

Bestie. Buckle in. We're going field by field and I'm gonna be so normal about it 💅

• vid — Vendor ID. who made it, basically 🌈
• pid — Product ID. which one of their things it is 💜
• xid — the value assigned by USB-IF for the product 🦋
• fw — Firmware version ✨
• hw — Hardware version 🎀
• skedb_ver — Sink Caps Extended Data Block (SKEDB) Version. yes it's an acronym inside an acronym, we love that for us 🍓
• load_step — indicates the load step slew rate 🔥
• load_char — Sink overload characteristics ⭐
• compliance — the types of sources the sink has been tested & certified on 🧚
• touch_temp — indicates the IEC standard to which the touch temperature conforms to (if applicable). note the if applicable — it's not always a thing 🙈
• batt_info — indicates number batteries and hot swappable ports 💀
• modes — Charging caps & power sources supported 👑
• spr_min_pdp — Sink Minimum PDP for SPR mode 🌸
• spr_op_pdp — Sink Operational PDP for SPR mode 💖
• spr_max_pdp — Sink Maximum PDP for SPR mode 🌺
• epr_min_pdp — Sink Minimum PDP for EPR mode 🌈
• epr_op_pdp — Sink Operational PDP for EPR mode 💜
• epr_max_pdp — Sink Maximum PDP for EPR mode ⭐

not me listing all eighteen fields and enjoying it 😭 every single one is here, iykyk

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🔥 SEE ALSO 🔥

• Kernel file ./include/linux/usb/pd.h struct
• pd_chunked_ext_message_data(9)
• struct pd_message(9)
• BSDO(9)

the whole pd.h friend group honestly 🫶

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and that's the page, bestie — courtesy of ./include/linux/usb, dated October 2026, filed under struct sink_caps_ext_msg(9). slay 💅✨🎀