v4l2_g_parm_cap(9)

💅 v4l2_g_parm_cap — a Kernel API Manual moment

okay so bestie, welcome to the Kernel API Manual page for v4l2_g_parm_cap(9) — yes the (9) is the section, we love a numbered era 🎀

✨ NAME ✨

v4l2_g_parm_cap — it's the helper routine for vidioc_g_parm, and its whole job is to fill that thing in by calling the get_frame_interval op of the subdev you hand it. that's it, that's the vibe 🦋

heads up bestie: it only works for V4L2_BUF_TYPE_VIDEO_CAPTURE(_MPLANE) — that's literally why there's a _cap in the function name, no cap fr 💀

🌸 SYNOPSIS 🌸

int v4l2_g_parm_cap (struct video_device *vdev , struct v4l2_subdev *sd
, struct v4l2_streamparm *a );

🎀 ARGUMENTS 🎀

• vdev — the struct video_device pointer. it's used to determine the device caps, so it's kind of the main character here 👑
• sd — the sub-device pointer. the subdev in question 💖
• a — the VIDIOC_G_PARM argument. the payload, the moment, the whole point ✨

🦋 SEE ALSO 🦋

the kernel file ./include/media/v4l2-common.h and honestly a whole friend group of siblings, iykyk:

• v4l2_ctrl_query_fill(9)
• 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_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)

and that's the page bestie 🫶 it lives in ./include/media, it's dated October 2026, and it's serving Kernel API Manual v4l2_g_parm_cap(9) realness. go read a subdev op, ily 💜