v4l2_ctrl_query_fill(9)

💖 NAME 💖

okay so v4l2_ctrl_query_fill — it literally fills in a struct v4l2_queryctrl for you. that's the whole vibe. this page is from the Kernel API Manual, bestie, so grab a snack 🍓 and let's get into it.

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✨ SYNOPSIS ✨

int v4l2_ctrl_query_fill (struct v4l2_queryctrl *qctrl , s32 min , s32
       max , s32 step , s32 def );

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🎀 ARGUMENTS 🎀

• qctrl — pointer to the struct v4l2_queryctrl you want filled. this is the main character of the operation, no cap 👑
• min — the minimum value for the control
• max — the maximum value for the control
• step — the control step
• def — the default value for the control

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💅 DESCRIPTION 💅

So what it does is it fills the struct v4l2_queryctrl fields for the query control. that's it, that's the whole job ✨

NOTE: this function assumes that the qctrl->id field is already filled. like, you gotta set that up yourself first, bestie — it's not gonna do it for you 🙈

As for how it goes: it returns -EINVAL if the control is not known by the V4L2 core, and 0 on success. slay 💀

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🦋 SEE ALSO 🦋

okay this list is long long, but i'm not skipping a single one, iykyk 💜 and also, kernel file ./include/media/v4l2-common.h:

• enum v4l2_i2c_tuner_type(9)
• v4l2_i2c_new_subdev(9)
• v4l2_i2c_new_subdev_board(9)
• v4l2_i2c_subdev_set_name(9)
• v4l2_i2c_subdev_init(9)
• v4l2_i2c_subdev_addr(9)
• v4l2_i2c_tuner_addrs(9)
• v4l2_i2c_subdev_unregister(9)
• v4l2_spi_new_subdev(9)
• v4l2_spi_subdev_init(9)
• v4l2_spi_subdev_unregister(9)
• v4l_bound_align_image(9)
• v4l2_find_nearest_size_conditional(9)
• v4l2_find_nearest_size(9)
• v4l2_g_parm_cap(9)
• v4l2_s_parm_cap(9)
• enum v4l2_pixel_encoding(9)
• struct v4l2_format_info(9)
• v4l2_get_link_freq(9)
• v4l2_get_active_data_lanes(9)
• v4l2_link_freq_to_bitmap(9)
• devm_v4l2_sensor_clk_get(9)
• devm_v4l2_sensor_clk_get_legacy(9)

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and that's the page!! 🫶 before you go — this lil beauty lives in ./include/media, it's from the October 2026 drop, and the page itself is v4l2_ctrl_query_fill(9). go fill some structs, bestie, you're gonna ate it up 🌈⭐