STRUCT SDCA_CONTROL(9)

💅 struct sdca_control(9) — the Kernel API Manual, bestie edition 🎀

okay so picture this: it's a Kernel API Manual, and today's main character is struct sdca_control — literally the info packet for one SDCA Control. one. single. control. and she's carrying a whole personality in here. let's get into it ✨

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🌸 NAME

struct sdca_control — information for one SDCA Control 🫶

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✨ SYNOPSIS

struct sdca_control {
    const char *label;
    int sel;
    int nbits;
    int *values;
    int reset;
    u64 cn_list;
    int interrupt_position;
    enum sdca_control_datatype type;
    struct sdca_control_range range;
    enum sdca_access_mode mode;
    u8 layers;
    bool deferrable;
    bool is_volatile;
    bool has_default;
    bool has_reset;
    bool has_fixed;
 };

like, look at her. sixteen fields. all iconic. no notes 💅

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🦋 Members

so here's the group chat — every field and what she actually does:

• label — the Name for the Control 🏷️ straight from the SDCA Specification v1.0, section 7.1.7. cite your sources, periodt.
• sel — the Identifier used for addressing.
• nbits — Number of bits used in the Control.
• values — Holds the Control value for constants and defaults.
• reset — the Defined reset value for the Control.
• cn_list — a bitmask showing the valid Control Numbers within this Control. lowkey important: Control Numbers typically represent channels. iykyk.
• interrupt_position — the SCDA interrupt line that will alert to changes on this Control. she will let you know.
• type — Format of the data in the Control.
• range — Buffer describing valid range of values for the Control.
• mode — Access mode of the Control.
• layers — Bitmask of access layers of the Control.
• deferrable — Indicates if the access to the Control can be deferred. not urgent, no stress 🧘
• is_volatile — Indicates the Control registers are forced to be treated as volatile. she's unpredictable like that 💀
• has_default — Indicates the Control has a default value to be written.
• has_reset — Indicates the Control has a defined reset value.
• has_fixed — Indicates the Control only supports a single value. one answer only, no options, very main character energy 👑

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🌈 SEE ALSO

Kernel file ./include/sound/sdca_function.h — and then the whole extended friend group, fr fr:

• 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_xu_controls(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)
• 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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🫶 that's the whole page, bestie. no gatekeeping, every single reference present and accounted for.

and before you close the tab — lil sign-off time 🎀 this one lives in ./include/sound, stamped October 2026, and it's filed under struct sdca_control(9) because that's the icon she is. slay, stay hydrated, and go read your headers 💖✨