STRUCT V4L2_CTRL_OPS(9)

💅 struct v4l2_ctrl_ops(9) 💅

okay so welcome to the Kernel API Manual, bestie — today’s main character is struct v4l2_ctrl_ops, and it’s literally the control-ops blueprint your driver has to provide. no cap, this is important. 💖

✨ NAME ✨

struct v4l2_ctrl_ops — the control operations that the driver has to provide. fr fr, if your driver touches V4L2 controls, this struct is your moment. 🎀

🌸 SYNOPSIS 🌸

       struct v4l2_ctrl_ops {
           int (*g_volatile_ctrl)(struct v4l2_ctrl *ctrl);
           int (*try_ctrl)(struct v4l2_ctrl *ctrl);
           int (*s_ctrl)(struct v4l2_ctrl *ctrl);
        };

🦋 Members 🦋

• g_volatile_ctrl — get a new value for this control. 💫 This is generally only relevant for volatile (and usually read-only) controls, like a control that returns the current signal strength which changes continuously. If it’s not set, then the currently cached value will be returned. iykyk.
• try_ctrl — test whether the control’s value is valid. 🧪 Only relevant when the usual min/max/step checks are not sufficient. like, the basic checks ate but you need the extra vibe check.
• s_ctrl — actually set the new control value. 🔥 s_ctrl is compulsory. The ctrl->handler->lock is held when these ops are called, so no one else can access controls owned by that handler. periodt.

🌈 SEE ALSO 🌈

Kernel file ./include/media/v4l2-ctrls.h — and honestly, the whole control-friend-group is here:

• union v4l2_ctrl_ptr(9), v4l2_ctrl_ptr_create(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_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)

that’s the whole page, bestie 💖 source: ./include/media · date: October 2026 · manual: Kernel API Manual · title: struct v4l2_ctrl_ops(9). mwah 💋