STRUCT SDCA_FUNCTION_DATA(9)

💖 struct sdca_function_data(9) 💖

okay bestie, welcome to the Kernel API Manual — this is the page for struct sdca_function_data, and it is literally the top-level information for one SDCA function. Think main-character data structure: it keeps the descriptor, init table, entities, clusters, delays, and the optional FDL/HID extras all cute and organized. Let's get into it 🫶

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✨ NAME ✨

struct sdca_function_data — top-level information for one SDCA function. That's the whole vibe: one SDCA function, all the top-level details, no cap.

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💅 SYNOPSIS 💅

Here's the struct in all its glory — keep the braces, semicolons, and spacing exactly where they are, bestie:

       struct sdca_function_data {
           struct sdca_function_desc *desc;
           struct sdca_init_write *init_table;
           struct sdca_entity *entities;
           struct sdca_cluster *clusters;
           int num_init_table;
           int num_entities;
           int num_clusters;
           unsigned int busy_max_delay;
           unsigned int reset_max_delay;
           struct sdca_fdl_data fdl_data;
           union {
             struct sdca_function_hid hid;
           };
        };

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🎀 Members 🎀

Every member is doing its own little job, and we are not skipping any of them:

• desc — pointer to the short descriptor from initial parsing. First-impression energy ✨
• init_table — pointer to a table of initialization writes. Like the to-do list of writes 🫡
• entities — dynamically allocated array of Entities.
• clusters — dynamically allocated array of Channel Clusters.
• num_init_table — number of initialization writes.
• num_entities — number of Entities reported in this Function.
• num_clusters — number of Channel Clusters reported in this Function.
• busy_max_delay — maximum Function busy delay in microseconds, before an error should be reported. Respect the limit or catch an error 😭
• reset_max_delay — maximum Function reset delay in microseconds, before an error should be reported. Same energy, reset edition 💀
• fdl_data — FDL data for this Function, if available.
• {unnamed_union} — anonymous. That's literally what it says, bestie; the union has no name and we respect its privacy 🙈
• hid — HID data for this Function, if available.

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🌈 SEE ALSO 🌈

Okay, this is the whole extended friend group. The kernel file is the home base, and every single one of these is invited to the group chat:

• Kernel file ./include/sound/sdca_function.h
• 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)
• 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)

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mwah 💋 that's the page! Source/version: ./include/sound. Date: October 2026. Title: struct sdca_function_data(9). Now go forth and slay those SDCA functions, bestie 💖