Am Thu, 5 Jul 2018 19:58:11 +0200 schrieb Pavel Machek <pavel@xxxxxx>: > Hi! > > > we are currently working on a led driver that we will eventually > > propose mainline. Our HW implies a kind of dominance where one LED > > can have multiple colors, but only one can be lid at once. > > So you have LED that is either off, or red, or green, or blue, but not > combinations? Yes, that is exactly the case. > > Lighting the dominant effectively (visible) turns off the recessive. > > The question is whether that visible effect should be reflected in > > the code. Or in other words, should the "brightness" in sysfs always > > correspond to what is actually visible? > > > > Our first version does not try to do that, because that would > > complicate the code a lot. LEDs would have to set each other and > > possibly remember to reset each other when they get toggled again. > > > > I doubt that being the first example of such an LED, but could not > > find a good example in the kernel. Maybe you can point out a driver > > that handles this problem in the "correct" way. > > I know about no other such example... so yes, yours may be first. > > My suggestion would be ... just ignore that, and live with your LEDs > being "slightly broken". That would be our preferred solution, i think ;). Henning > Pavel >
