v4l2_ctrl_handler_setup(9)

👑 v4l2_ctrl_handler_setup(9) 👑

(Kernel API Manual) — okay bestie, this is a kernel API page and it's lowkey iconic. 💻✨

🌸 NAME 🌸

v4l2_ctrl_handler_setup — call the s_ctrl op for all controls belonging to the handler to initialize the hardware to the current control values. 💅

💅 SYNOPSIS 💅

int v4l2_ctrl_handler_setup (struct v4l2_ctrl_handler *hdl );

🎀 ARGUMENTS 🎀

• hdl — the control handler. that's the whole argument, no cap. 🫶

✨ DESCRIPTION ✨

okay so picture this: this function calls the s_ctrl op for every control that belongs to the handler, so the hardware gets initialized to the current control values. main character energy fr fr. 🔥

Button controls will be skipped, and read-only controls are skipped too. not invited to the setup party, sorry. 🙈

If hdl == NULL, then this just returns 0. literally that's it. 🫶

👀 SEE ALSO 👀

the whole kernel friend group is tagged below, exactly as listed — no cap, no omissions:

• 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_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_to_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)

mwah 💋 — footer tea: ./include/media • October 2026 • v4l2_ctrl_handler_setup(9). bestie, that's a wrap. 🫶