v4l2_query_...l2_queryctrl(9)

💅 v4l2_query_ext_ctrl_to_v4l2_queryctrl — a Kernel API Manual moment

okay so this is the Kernel API Manual page for the tiny little translator between the extended-control world and the classic-control world. bestie, it is giving “glow-up but make it struct.” 🦋

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🌸 NAME 🌸

v4l2_query_ext_ctrl_to_v4l2_queryctrl — Convert a qec to qe.

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✨ SYNOPSIS ✨

void v4l2_query_ext_ctrl_to_v4l2_queryctrl (struct v4l2_queryctrl *to ,
const struct v4l2_query_ext_ctrl *from );

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🎀 ARGUMENTS 🎀

• to — the v4l2_queryctrl you're writing to. destination energy, no cap.
• from — the v4l2_query_ext_ctrl you're reading from. source energy, obviously.

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💖 DESCRIPTION 💖

This function is a helper to convert a v4l2_query_ext_ctrl into a v4l2_queryctrl.

that’s literally the whole job. it’s the “you got extended ctrl in my classic ctrl” moment, and honestly? iconic. 🫶

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🔥 SEE ALSO 🔥

the ctrl cinematic universe is huge, so buckle up bestie:

• Kernel file ./include/media/v4l2-ctrls.h: union v4l2_ctrl_ptr(9), v4l2_ctrl_ptr_create(9), struct v4l2_ctrl_ops(9), struct v4l2_ctrl_type_ops(9), v4l2_ctrl_notify_fnc(9), struct v4l2_ctrl(9), struct v4l2_ctrl_ref(9), struct v4l2_ctrl_handler(9), struct v4l2_ctrl_config(9), v4l2_ctrl_fill(9), v4l2_ctrl_handler_init_class(9), v4l2_ctrl_handler_init(9), v4l2_ctrl_handler_free(9), v4l2_ctrl_lock(9), v4l2_ctrl_unlock(9), __v4l2_ctrl_handler_setup(9), v4l2_ctrl_handler_setup(9), v4l2_ctrl_handler_log_status(9), v4l2_ctrl_new_custom(9), v4l2_ctrl_new_std(9), v4l2_ctrl_new_std_menu(9), v4l2_ctrl_new_std_menu_items(9), v4l2_ctrl_new_std_compound(9), v4l2_ctrl_new_int_menu(9), v4l2_ctrl_filter(9), v4l2_ctrl_add_handler(9), v4l2_ctrl_radio_filter(9), v4l2_ctrl_cluster(9), v4l2_ctrl_auto_cluster(9), v4l2_ctrl_find(9), v4l2_ctrl_activate(9)
• __v4l2_ctrl_grab(9), v4l2_ctrl_grab(9), __v4l2_ctrl_modify_range(9), v4l2_ctrl_modify_range(9), __v4l2_ctrl_modify_dimensions(9), v4l2_ctrl_modify_dimensions(9), v4l2_ctrl_notify(9), v4l2_ctrl_get_name(9), v4l2_ctrl_get_menu(9), v4l2_ctrl_get_int_menu(9), v4l2_ctrl_g_ctrl(9), __v4l2_ctrl_s_ctrl(9), v4l2_ctrl_s_ctrl(9), v4l2_ctrl_g_ctrl_int64(9), __v4l2_ctrl_s_ctrl_int64(9), v4l2_ctrl_s_ctrl_int64(9), __v4l2_ctrl_s_ctrl_string(9), v4l2_ctrl_s_ctrl_string(9), __v4l2_ctrl_s_ctrl_compound(9), v4l2_ctrl_s_ctrl_compound(9)
• v4l2_ctrl_replace(9), v4l2_ctrl_merge(9), v4l2_ctrl_log_status(9), v4l2_ctrl_subscribe_event(9), v4l2_ctrl_poll(9), v4l2_ctrl_request_setup(9), v4l2_ctrl_request_complete(9), v4l2_ctrl_request_hdl_find(9), v4l2_ctrl_request_hdl_put(9), v4l2_ctrl_request_hdl_ctrl_find(9), v4l2_queryctrl(9), v4l2_query_ext_ctrl(9), v4l2_querymenu(9)
• v4l2_g_ctrl(9), v4l2_s_ctrl(9), v4l2_g_ext_ctrls(9), v4l2_try_ext_ctrls(9), v4l2_s_ext_ctrls(9), v4l2_ctrl_subdev_subscribe_event(9), v4l2_ctrl_subdev_log_status(9), v4l2_ctrl_new_fwnode_properties(9), v4l2_ctrl_type_op_equal(9), v4l2_ctrl_type_op_init(9), v4l2_ctrl_type_op_log(9), v4l2_ctrl_type_op_validate(9)

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and that’s the tea, bestie 🍓 — cute little sign-off from source/version ./include/media, dated October 2026, and the page title/version is still v4l2_query_...l2_queryctrl(9). mwah 💋✨