Hi! > > > On the device Logitech Litra Glow it is possible to set not only the > > > brightness but also the color temperature (both via usb as well as via > > > hardware). > > > I am currently trying to add support for the device - and expose it > > > via LED - into the kernel. > > > So to support all device capabilities I am proposing to extend LEDs by > > > color temperature: > > > And initial patch for the headers: > > > > Internally, the litra glow is something like RGB LED, right? Can we > > support it as a multicolor LED? > The litra glow has 2 control dimensions - brightness and color temperature. > Both dimensions can be controlled in something of a continuous range > (not sure whether these are strictly linear or not). > Thus mapping to RGB would look like more of a very sparse array. > Also, not sure which exact RGB value you would map a color temperature > to anyway. > So at first glance supporting it as a multicolor LED does not seem a > good match to me. Hmm, and there are likely to be more lights like this, right? OTOH it is not really an indicator LED -- using capslock trigger makes little sense with this one. I guess it makes sense to support this in LED subsystem. I believe it should be only supported for "white" LEDs. I believe first step is defining an userspace API in Documentation. Best regards, Pavel -- People of Russia, stop Putin before his war on Ukraine escalates.
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