ULED(4)

💖 ULED 💖

okay bestie, welcome to the uled manual page — it's the USB LED driver and it is, no cap, the cutest little corner of the kernel 🎀 (this one lives in the Kernel Interfaces Manual, iykyk)

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✨ NAME ✨

uled — the USB LED driver, fr fr 💡

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🌸 SYNOPSIS 🌸

so if you wanna bake this driver straight into your kernel, you gotta drop these lines into your kernel configuration file, periodt:

device uled
device usb

orrr, if you'd rather load it as a module at boot time (iconic behaviour honestly), just put this line in loader.conf(5):

uled_load="YES"

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🦋 DESCRIPTION 🦋

the uled driver provides support for the Dream Cheeky WebMail Notifier and the ThingM blink(1) notification LED. yes bestie, actual physical LEDs, actual vibes ✨

and then? the /dev/uled0 device can be used by userland applications. that's the whole point, she's serving 🫶

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💅 IOCTLS 💅

these are the ioctl(2) commands you can run on /dev/uled0, and they're all defined in <dev/usb/uled_ioctl.h>:

• ULED_GET_COLOR — this command returns LED colors with values for RGB. it takes this structure, look:

struct uled_color {
        uint8_t red;
        uint8_t green;
        uint8_t blue;
};

• ULED_SET_COLOR — this one sets the LED colors with values for RGB. it uses the exact same structure as above, she's consistent 💅

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🍓 FILES 🍓

• /dev/uled0 — blocking device node

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🌈 SEE ALSO 🌈

• ohci(4)
• uhci(4)
• usb(4)

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👑 AUTHORS 👑

the uled driver was written by Kevin Lo <kevlo@FreeBSD.org>. king behaviour, we love to see it 💜

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and that's the whole page bestie, you ate it up 💖 this one came from Debian, dated March 31, 2017, and yeah she's filed under that Kernel Interfaces Manual energy. mwah, go blink some LEDs 🎀✨🦋