STRUCT V4L2_CTRL_TYPE_OPS(9)

💅 struct v4l2_ctrl_type_ops(9) 💅

okay bestie, welcome to the Kernel API Manual ✨ — this one's about struct v4l2_ctrl_type_ops, which is, like, the control type operations that the driver has to provide. no cap. the driver literally has to hand these over. it's giving "you want a control? then you're bringing the ops" 🎀

✨ SYNOPSIS ✨

struct v4l2_ctrl_type_ops {
    bool (*equal)(const struct v4l2_ctrl *ctrl, union v4l2_ctrl_ptr ptr1, union v4l2_ctrl_ptr ptr2);
    void (*init)(const struct v4l2_ctrl *ctrl, u32 from_idx, union v4l2_ctrl_ptr ptr);
    void (*minimum)(const struct v4l2_ctrl *ctrl, u32 idx, union v4l2_ctrl_ptr ptr);
    void (*maximum)(const struct v4l2_ctrl *ctrl, u32 idx, union v4l2_ctrl_ptr ptr);
    void (*log)(const struct v4l2_ctrl *ctrl);
    int (*validate)(const struct v4l2_ctrl *ctrl, union v4l2_ctrl_ptr ptr);
 };

like, look at her. six function pointers, all main character energy 👑

🌸 Members 🌸

• equal — returns true if all the ctrl->elems array elements are equal. literally the vibe check for your array 💖
• init — initializes the value for the array elements from from_idx to ctrl->elems. it's giving "setup era" 🦋
• minimum — sets the value to the minimum value of the control. lowkey the floor 🧚
• maximum — sets the value to the maximum value of the control. highkey the ceiling 💅
• log — logs the value. yes she journals 📓✨
• validate — validates the value for the ctrl->new_elems array elements. returns 0 on success and a negative value otherwise. so if you get a negative back, that's a no from her, sorry babe 😭

🔥 SEE ALSO 🔥

Kernel file ./include/media/v4l2-ctrls.h, plus the whole entire friend group, no cap:

union v4l2_ctrl_ptr(9), v4l2_ctrl_ptr_create(9), struct v4l2_ctrl_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)

fr fr that's the whole squad — go read the ones you actually need, bestie, they're all iconique 🌈

and that's the page!! 🫶 this little beauty lives in ./include/media, dated October 2026, and yes she's still out here answering to struct v4l2_ctrl_type_ops(9). slay, periodt, go write your ops 💜👑