v4l2_subdev_notify_event(9)

✨ v4l2_subdev_notify_event ✨

okay so real talk — this is a page from the Kernel API Manual, and bestie, it's a tiny one but it's lowkey important. Sit down, hydrate, let's get into it 🫶

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🌸 NAME 🌸

v4l2_subdev_notify_event — delivers event notification for subdevice 💌

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🎀 SYNOPSIS 🎀

void v4l2_subdev_notify_event (struct v4l2_subdev *sd , const struct
v4l2_event *ev );

that's it. that's the whole signature. it returns void, so like… no exit codes, no "did it work" report, it just does the thing and vibes 💅

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🦋 ARGUMENTS 🦋

• sd — the subdev for which to deliver the event. this is the main character of the operation, the one getting notified 👑
• ev — the event to deliver. the actual little message payload, hand-delivered with care 🎀

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🌈 DESCRIPTION 🌈

okay so what does it actually do? it will deliver the specified event to all userspace event listeners which are subscribed to the v42l subdev event queue — and yes, that's literally how it's spelled in the source, v42l, not me, don't come for me 😭 — as well as to the bridge driver using the notify callback ✨

and the notification type for that notify callback? it will be V4L2_DEVICE_NOTIFY_EVENT. that's the type. that's the vibe. iykyk 💫

so basically: userspace peeps listening → they get it. bridge driver → it gets it too, tagged as V4L2_DEVICE_NOTIFY_EVENT. everybody eats 🍓

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💜 SEE ALSO 💜

buckle up bestie, this list is long — the kernel doc people really said "you want cross-references? here's every single one" 💀 but fr fr, they're all real and all here:

• Kernel file ./include/media/v4l2-subdev.h struct
• v4l2_decode_vbi_line(9)
• enum v4l2_subdev_io_pin_bits(9)
• struct v4l2_subdev_io_pin_config(9)
• struct v4l2_subdev_core_ops(9)
• struct v4l2_subdev_tuner_ops(9)
• struct v4l2_subdev_audio_ops(9)
• struct v4l2_mbus_frame_desc_entry_csi2(9)
• enum v4l2_mbus_frame_desc_flags(9)
• struct v4l2_mbus_frame_desc_entry(9)
• enum v4l2_mbus_frame_desc_type(9)
• struct v4l2_mbus_frame_desc(9)
• enum v4l2_subdev_pre_streamon_flags(9)
• struct v4l2_subdev_video_ops(9)
• struct v4l2_subdev_vbi_ops(9)
• struct v4l2_subdev_sensor_ops(9)
• enum v4l2_subdev_ir_mode(9)
• struct v4l2_subdev_ir_parameters(9)
• struct v4l2_subdev_ir_ops(9)
• struct v4l2_subdev_pad_config(9)
• struct v4l2_subdev_stream_configs(9)
• struct v4l2_subdev_krouting(9)
• struct v4l2_subdev_state(9)
• struct v4l2_subdev_pad_ops(9)
• struct v4l2_subdev_ops(9)
• struct v4l2_subdev_internal_ops(9)
• struct v4l2_subdev_platform_data(9)
• struct v4l2_subdev(9)
• media_entity_to_v4l2_subdev(9)
• vdev_to_v4l2_subdev(9)
• struct v4l2_subdev_fh(9)
• to_v4l2_subdev_fh(9)
• v4l2_set_subdevdata(9)
• v4l2_get_subdevdata(9)
• v4l2_set_subdev_hostdata(9)
• v4l2_get_subdev_hostdata(9)
• v4l2_subdev_get_fwnode_pad_1_to_1(9)
• v4l2_subdev_link_validate_default(9)
• v4l2_subdev_link_validate(9)
• v4l2_subdev_has_pad_interdep(9)
• __v4l2_subdev_state_alloc(9)
• __v4l2_subdev_state_free(9)
• v4l2_subdev_init_finalize(9)
• v4l2_subdev_cleanup(9)
• v4l2_subdev_state_get_format(9)
• v4l2_subdev_state_get_crop(9)
• v4l2_subdev_state_get_compose(9)
• v4l2_subdev_state_get_interval(9)
• v4l2_subdev_get_fmt(9)
• v4l2_subdev_get_frame_interval(9)
• v4l2_subdev_set_routing(9)
• for_each_active_route(9)
• v4l2_subdev_set_routing_with_fmt(9)
• v4l2_subdev_routing_find_opposite_end(9)
• v4l2_subdev_state_get_opposite_stream_format(9)
• v4l2_subdev_state_xlate_streams(9)
• enum v4l2_subdev_routing_restriction(9)
• v4l2_subdev_routing_validate(9)
• v4l2_subdev_enable_streams(9)
• v4l2_subdev_disable_streams(9)
• v4l2_subdev_s_stream_helper(9)
• __v4l2_subdev_get_frame_desc_passthrough(9)
• v4l2_subdev_get_frame_desc_passthrough(9)
• v4l2_subdev_lock_state(9)
• v4l2_subdev_unlock_state(9)
• v4l2_subdev_lock_states(9)
• v4l2_subdev_unlock_states(9)
• v4l2_subdev_get_unlocked_active_state(9)
• v4l2_subdev_get_locked_active_state(9)
• v4l2_subdev_lock_and_get_active_state(9)
• v4l2_subdev_init(9)
• v4l2_subdev_call(9)
• v4l2_subdev_call_state_active(9)
• v4l2_subdev_call_state_try(9)
• v4l2_subdev_has_op(9)
• v4l2_subdev_is_streaming(9)

like i said. long. but every single one is a real page, go click around, it's giving kernel-nerd treasure hunt 🧚

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no cap, that's genuinely the entire page — no warnings, no bugs section, no return value, nothing to be scared of. it's a tiny function doing a big job and honestly? iconic 🎀

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and that's a wrap, bestie!! 🫶 this lil guy lives in ./include/media and this particular glow-up is dated October 2026 — go forth, notify some events, and slay ✨💅🔥