v4l2_ctrl_activate(9)

✨ NAME ✨

okay bestie, welcome to v4l2_ctrl_activate(9) from the Kernel API Manual 💖 — this one is literally about making the control active or inactive. That’s the whole vibe. 🎀

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🌸 SYNOPSIS 🌸

void v4l2_ctrl_activate (struct v4l2_ctrl *ctrl , bool active );

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💅 ARGUMENTS 💅

• ctrl — the control to (de)activate.
• active — True if the control should become active.

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🦋 DESCRIPTION 🦋

okay so this function sets or clears the V4L2_CTRL_FLAG_INACTIVE flag atomically ✨. If ctrl == NULL, it does literally nothing — no drama, no cap. 🫶

It’s usually called from inside the s_ctrl op. After that, the V4L2_EVENT_CTRL event will be generated. 🔥

⚠️ This function assumes that the control handler is locked — that’s the fine print, bestie. 🔒

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👑 SEE ALSO 👑

the lore is deep, so here’s every single related icon 💜:

• 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_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)

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xoxo, bestie 💖 — that was v4l2_ctrl_activate(9) from the Kernel API Manual, source: ./include/media, dated October 2026. slay and stay iconic! ✨👑