ENUM SDCA_XU_CONTROLS(9)

🌸 NAME 🌸

enum sdca_xu_controls — the SDCA controls for the Extension Unit, bestie 💅

okay so real talk, this is enum sdca_xu_controls(9), straight out of the Kernel API Manual, and it's literally the enum of Control Selectors that the Extension Unit uses. iykyk 🎀

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✨ SYNOPSIS ✨

enum sdca_xu_controls {
    SDCA_CTL_XU_BYPASS ,
    SDCA_CTL_XU_LATENCY ,
    SDCA_CTL_XU_XU_ID ,
    SDCA_CTL_XU_XU_VERSION ,
    SDCA_CTL_XU_FDL_CURRENTOWNER ,
    SDCA_CTL_XU_FDL_MESSAGEOFFSET ,
    SDCA_CTL_XU_FDL_MESSAGELENGTH ,
    SDCA_CTL_XU_FDL_STATUS ,
    SDCA_CTL_XU_FDL_SET_INDEX ,
    SDCA_CTL_XU_FDL_HOST_REQUEST ,
    SDCA_CTL_XU_FDLH_TRANSFERRED_CHUNK ,
    SDCA_CTL_XU_FDLH_TRANSFERRED_FILE ,
    SDCA_CTL_XU_FDLH_SET_IN_PROGRESS ,
    SDCA_CTL_XU_FDLH_RESET_ACK ,
    SDCA_CTL_XU_FDLH_REQ_ABORT ,
    SDCA_CTL_XU_FDLD_REQ_RESET ,
    SDCA_CTL_XU_FDLD_REQ_ABORT ,
    SDCA_CTL_XU_FDLD_ACK_TRANSFER ,
    SDCA_CTL_XU_FDLD_NEEDS_SET

};

like, that's the whole lineup 👑 no cap.

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🌈 Constants 🌈

sooo here's the thing — every single one of these is marked -- undescribed -- in the original, meaning the docs legit have nothing for them yet 😭 so i'm not gonna make up lore, we're just gonna list them and vibe:

• SDCA_CTL_XU_BYPASS — -- undescribed --
• SDCA_CTL_XU_LATENCY — -- undescribed --
• SDCA_CTL_XU_XU_ID — -- undescribed --
• SDCA_CTL_XU_XU_VERSION — -- undescribed --
• SDCA_CTL_XU_FDL_CURRENTOWNER — -- undescribed --
• SDCA_CTL_XU_FDL_MESSAGEOFFSET — -- undescribed --
• SDCA_CTL_XU_FDL_MESSAGELENGTH — -- undescribed --
• SDCA_CTL_XU_FDL_STATUS — -- undescribed --
• SDCA_CTL_XU_FDL_SET_INDEX — -- undescribed --
• SDCA_CTL_XU_FDL_HOST_REQUEST — -- undescribed --
• SDCA_CTL_XU_FDLH_TRANSFERRED_CHUNK — -- undescribed --
• SDCA_CTL_XU_FDLH_TRANSFERRED_FILE — -- undescribed --
• SDCA_CTL_XU_FDLH_SET_IN_PROGRESS — -- undescribed --
• SDCA_CTL_XU_FDLH_RESET_ACK — -- undescribed --
• SDCA_CTL_XU_FDLH_REQ_ABORT — -- undescribed --
• SDCA_CTL_XU_FDLD_REQ_RESET — -- undescribed --
• SDCA_CTL_XU_FDLD_REQ_ABORT — -- undescribed --
• SDCA_CTL_XU_FDLD_ACK_TRANSFER — -- undescribed --
• SDCA_CTL_XU_FDLD_NEEDS_SET — -- undescribed --

all nineteen of them, present and accounted for 🫶

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🦋 Description 🦋

These are the Control Selectors for the Extension Unit, periodt. Straight from the SDCA specification v1.0, section 6.3.10.3 — that's the receipt, fr fr ✨

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💜 SEE ALSO 💜

Kernel file ./include/sound/sdca_function.h, plus the whole extended friend group 😭 (yes, all of them, i'm not skipping anyone, that would be mean):

• enum sdca_function_type(9)
• struct sdca_init_write(9)
• SDCA_CTL_TYPE(9)
• SDCA_CTL_TYPE_S(9)
• enum sdca_messageoffset_range(9)
• enum sdca_ump_mode(9)
• enum sdca_ump_owner(9)
• enum sdca_it_controls(9)
• enum sdca_ot_controls(9)
• enum sdca_usage_range(9)
• enum sdca_dataport_selector_range(9)
• enum sdca_mu_controls(9)
• enum sdca_su_controls(9)
• enum sdca_fu_controls(9)
• enum sdca_volume_range(9)
• enum sdca_fdl_set_index_range(9)
• enum sdca_cs_controls(9)
• enum sdca_samplerateindex_range(9)
• enum sdca_cx_controls(9)
• enum sdca_pde_controls(9)
• enum sdca_requested_ps_range(9)
• enum sdca_ge_controls(9)
• enum sdca_selected_mode_range(9)
• enum sdca_detected_mode_values(9)
• enum sdca_spe_controls(9)
• enum sdca_cru_controls(9)
• enum sdca_udmpu_controls(9)
• enum sdca_mfpu_controls(9)
• enum sdca_smpu_controls(9)
• enum sdca_sapu_controls(9)
• enum sdca_ppu_controls(9)
• enum sdca_tg_controls(9)
• enum sdca_hide_controls(9)
• enum sdca_entity0_controls(9)
• enum sdca_control_datatype(9)
• enum sdca_access_mode(9)
• enum sdca_access_layer(9)
• struct sdca_control_range(9)
• struct sdca_control(9)
• enum sdca_terminal_type(9)
• enum sdca_connector_type(9)
• struct sdca_entity_iot(9)
• enum sdca_clock_type(9)
• struct sdca_entity_cs(9)
• enum sdca_pde_power_state(9)
• struct sdca_pde_delay(9)
• struct sdca_entity_pde(9)
• enum sdca_entity_type(9)
• struct sdca_ge_control(9)
• struct sdca_ge_mode(9)
• struct sdca_entity_ge(9)
• struct sdca_entity_hide(9)
• enum sdca_xu_reset_mechanism(9)
• struct sdca_entity_xu(9)
• struct sdca_entity(9)
• enum sdca_channel_purpose(9)
• enum sdca_channel_relationship(9)
• struct sdca_channel(9)
• struct sdca_cluster(9)
• enum sdca_cluster_range(9)
• struct sdca_fdl_file(9)
• struct sdca_fdl_set(9)
• struct sdca_fdl_data(9)
• struct sdca_function_hid(9)
• struct sdca_function_data(9)

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aaaand that's the page, bestie 🧚💖 it lives in ./include/sound, dated October 2026 — so basically it's from the future and still ate, iconic behavior honestly 🌟 mwah, go read the header file, ily, bye 💅🍓