v4l2_device_register(9)

✨ v4l2_device_register 💅

okay so this is from the Kernel API Manual bestie, and it's literally the function that sets everything up: it initializes v4l2_dev and makes @dev->driver_data point to @v4l2_dev. two things, one call, iconic behaviour 🎀

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🌸 SYNOPSIS 🌸

int v4l2_device_register (struct device *dev , struct v4l2_device
*v4l2_dev );

that's it. that's the whole signature. she's not complicated, she's just important 💖

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🦋 ARGUMENTS 🦋

• dev — pointer to struct device. yeah. that one. 👀
• v4l2_dev — pointer to struct v4l2_device. the main character of this whole operation ngl 💅

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🔥 DESCRIPTION 🔥

NOTE: dev may be NULL in rare cases (ISA devices). and in that case — listen up, this is the part that matters — the caller must fill in the v4l2_dev->name field before calling this function. no cap. if you skip that step, you're on your own fr fr 😭

so like, normally you pass a real dev and everything's cute and handled for you. but those rare ISA-device situations? you gotta hand-deliver the v4l2_dev->name yourself first. consider it the cover charge for entry 🎟️✨

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🌈 SEE ALSO 🌈

bestie this list is long and every single one of them is getting her moment, because they're all family:

• Kernel file ./include/media/v4l2-device.h struct v4l2_device(9)
• v4l2_device_get(9)
• v4l2_device_put(9)
• v4l2_device_set_name(9)
• v4l2_device_disconnect(9)
• v4l2_device_unregister(9)
• v4l2_device_register_subdev(9)
• v4l2_device_unregister_subdev(9)
• __v4l2_device_register_subdev_nodes(9)
• v4l2_device_register_subdev_nodes(9)
• v4l2_device_register_ro_subdev_nodes(9)
• v4l2_subdev_notify(9)
• v4l2_device_supports_requests(9)
• v4l2_device_for_each_subdev(9)
• __v4l2_device_call_subdevs_p(9)
• __v4l2_device_call_subdevs(9)
• __v4l2_device_call_subdevs_until_err_p(9)
• __v4l2_device_call_subdevs_until_err(9)
• v4l2_device_call_all(9)
• v4l2_device_call_until_err(9)
• v4l2_device_mask_call_all(9)
• v4l2_device_mask_call_until_err(9)
• v4l2_device_has_op(9)
• v4l2_device_mask_has_op(9)

twenty-four entries, all under ./include/media, all slaying in their own lane 👑 like yes the double-underscore ones are the ✨internal✨ girls, we respect them anyway 🫶

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and that's the whole vibe check bestie 💀 go forth, register your devices, remember the NULL caveat, and hydrate 💧

with love from ./include/media — October 2026 edition, Kernel API Manual, mwah 💋