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Re: [PATCH v5 1/4] leds: core: add generic support for RGB Color LED's

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Hi!

> >Ok, so:
> >
> >a) Do we want RGB leds to be handled by existing subsystem, or do we
> >need separate layer on top of that?
> >
> >b) Does RGB make sense, or HSV? RGB is quite widely used in graphics,
> >and it is what hardware implements. (But we'd need to do gamma
> >correction).
> >
> >c) My hardware has "acceleration engine", LED is independend from
> >CPU. That's rather big deal. Does yours? It seems to be quite common,
> >at least in cellphones.
> >
> >Ideally, I'd like to have "triggers", but different ones. As in: if
> >charging, do yellow " .xX" pattern. If fully charged, do green steady
> >light. If message is waiting, do blue " x x" pattern. If none of
> >above, do slow white blinking. (Plus priorities of events). But that's
> >quite different from existing support...)
> 
> Please note that HSV colour scheme allows to neatly project monochrome
> brightness semantics on the RGB realm. I.e. you can have fixed
> hue and saturation, and by changing the brightness component a perceived
> colour intensity can be altered.

I see HSV has some advantages. But we already have LEDs with multiple
colors, and kernel already handles them:

pavel@duo:~$ ls -1 /sys/class/leds/
tpacpi:green:batt
tpacpi:orange:batt

This is physically 2 leds but hidden under one indicator, so you got
"off", "green", "orange" and "green+orange".
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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Re: [PATCH v5 1/4] leds: core: add generic support for RGB Color  LED's Pavel Machek <pavel@ucw.cz> - 2016-03-29 12:10 +0200
  Re: [PATCH v5 1/4] leds: core: add generic support for RGB Color  LED's Heiner Kallweit <hkallweit1@gmail.com> - 2016-03-29 22:50 +0200
    Re: [PATCH v5 1/4] leds: core: add generic support for RGB Color  LED's Pavel Machek <pavel@ucw.cz> - 2016-03-29 23:50 +0200
      Re: [PATCH v5 1/4] leds: core: add generic support for RGB Color  LED's Pavel Machek <pavel@ucw.cz> - 2016-03-30 00:10 +0200
      Re: [PATCH v5 1/4] leds: core: add generic support for RGB Color  LED's Heiner Kallweit <hkallweit1@gmail.com> - 2016-03-30 08:00 +0200
        Re: [PATCH v5 1/4] leds: core: add generic support for RGB Color  LED's Pavel Machek <pavel@ucw.cz> - 2016-04-01 15:00 +0200
      Re: [PATCH v5 1/4] leds: core: add generic support for RGB Color LED's Jacek Anaszewski <j.anaszewski@samsung.com> - 2016-03-30 10:10 +0200
        Re: [PATCH v5 1/4] leds: core: add generic support for RGB Color  LED's Pavel Machek <pavel@ucw.cz> - 2016-03-30 15:10 +0200
          Re: [PATCH v5 1/4] leds: core: add generic support for RGB Color LED's Heiner Kallweit <hkallweit1@gmail.com> - 2016-03-30 16:10 +0200
            Re: [PATCH v5 1/4] leds: core: add generic support for RGB Color LED's Jacek Anaszewski <j.anaszewski@samsung.com> - 2016-03-31 10:20 +0200
              Re: [PATCH v5 1/4] leds: core: add generic support for RGB Color  LED's Pavel Machek <pavel@ucw.cz> - 2016-04-01 16:00 +0200
                Re: [PATCH v5 1/4] leds: core: add generic support for RGB Color  LED's Jacek Anaszewski <jacek.anaszewski@gmail.com> - 2016-04-01 21:00 +0200
                Re: [PATCH v5 1/4] leds: core: add generic support for RGB Color  LED's Pavel Machek <pavel@ucw.cz> - 2016-04-01 23:20 +0200
            Re: [PATCH v5 1/4] leds: core: add generic support for RGB Color  LED's Pavel Machek <pavel@ucw.cz> - 2016-04-01 15:00 +0200
              Re: [PATCH v5 1/4] leds: core: add generic support for RGB Color LED's Jacek Anaszewski <j.anaszewski@samsung.com> - 2016-04-01 15:30 +0200
                Re: [PATCH v5 1/4] leds: core: add generic support for RGB Color  LED's Pavel Machek <pavel@ucw.cz> - 2016-04-01 16:10 +0200
                Re: [PATCH v5 1/4] leds: core: add generic support for RGB Color LED's Jacek Anaszewski <j.anaszewski@samsung.com> - 2016-04-01 16:30 +0200
                Re: [PATCH v5 1/4] leds: core: add generic support for RGB Color  LED's Pavel Machek <pavel@ucw.cz> - 2016-04-01 17:10 +0200
        Re: [PATCH v5 1/4] leds: core: add generic support for RGB Color  LED's Pavel Machek <pavel@ucw.cz> - 2016-04-01 15:00 +0200
    Re: [PATCH v5 1/4] leds: core: add generic support for RGB Color LED's Jacek Anaszewski <j.anaszewski@samsung.com> - 2016-03-30 10:00 +0200

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