v4l2_flash_init(9)

💅 v4l2_flash_init(9) — from the Kernel API Manual, bestie ✨

okay so. this whole page is about v4l2_flash_init, and it lives in the Kernel API Manual. it's the glow-up function for V4L2 flash LED sub-devices, and honestly? she's giving main character energy. let's get into it 🎀

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✨ NAME ✨

v4l2_flash_init — initialize V4L2 flash led sub-device

like, the whole point. she sets the thing up. periodt 💅

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🌸 SYNOPSIS 🌸

struct v4l2_flash * v4l2_flash_init (struct device *dev , struct
fwnode_handle *fwn , struct led_classdev_flash *fled_cdev , const struct
v4l2_flash_ops *ops , struct v4l2_flash_config *config );

five args, no skips. copy it exactly, she's particular about her signature 💖

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🦋 ARGUMENTS 🦋

• dev — the flash device, like for example an I2C device. the whole reason we're here fr fr
• fwn — the fwnode_handle of the LED. and listen, this one may be NULL if it's the same as the device's own. lowkey convenient 🫶
• fled_cdev — the LED flash class device she's wrapping up. give her something cute to hold ✨
• ops — the V4L2 Flash device ops. the behavior, the vibes, the moves 👑
• config — initialization data for the V4L2 Flash sub-device. her starter pack 🎀

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💜 DESCRIPTION 💜

So what she actually does: create a V4L2 Flash sub-device that wraps the given LED subsystem device. that's the whole assignment and she ate 💅

the ops pointer gets stored by the V4L2 flash framework — she keeps it, okay? she's holding onto it. but heads up, bestie:

no references are held to config nor its contents once this function has returned. like, zero. none. so don't be out here thinking she's babysitting your config struct, because she is NOT 😭 that memory is your problem now.

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⭐ RETURN ⭐

on success you get a valid pointer 🎉

on error, the return value is encoded using ERR_PTR. and no cap, you gotta check it properly:

• use IS_ERR to check
• use PTR_ERR to obtain the numeric return value

don't just vibe-check the pointer and hope for the best, please 🙈

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🌈 SEE ALSO 🌈

• Kernel file ./include/media/v4l2-flash-led-class.h
• struct v4l2_flash_ctrl_data(9)
• struct v4l2_flash_ops(9)
• struct v4l2_flash_config(9)
• struct v4l2_flash(9)
• v4l2_subdev_to_v4l2_flash(9)
• v4l2_ctrl_to_v4l2_flash(9)
• v4l2_flash_indicator_init(9)
• v4l2_flash_release(9)

the whole friend group, go say hi 🫶

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and that's the page!! sourced straight from ./include/media, dated October 2026, and yes it's still v4l2_flash_init(9) — she's iconic, she's consistent, and she's out 💖✨🧚‍♀️