Re: [PATCH 1/2] leds: Add driver for Qualcomm LPG

[Pavel Machek <pavel-+ZI9xUNit7I@public.gmane.org>]

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On Fri 2017-04-07 13:36:49, Bjorn Andersson wrote:
> On Fri 07 Apr 06:32 PDT 2017, Pavel Machek wrote:
> 
> > > For the patterns I don't know how a trigger for this would look like,
> > > how would setting the pattern of a trigger be propagated down to the
> > > hardware?
> > 
> > Well... I'm not sure if we _want_ to do triggers for
> > patterns. LED triggers change rather quickly (100 times a second?) so
> > doing them in kernel makes sense. Patterns take 10s of seconds, so we
> > do not need to handle them in kernel. 
> > 
> 
> On any current Qualcomm based phone (using the Qualcomm PMIC to drive
> the RGB notification LED) the patterns are hard coded in DeviceTree and
> the option you have in runtime is to enable/disable the usage of the
> configured pattern and a few knobs of how to traverse the configured
> pattern.

Yes... that's easy, but I believe too limiting. Users will want to
configure their own patterns for their own events.

> When you enter e.g. a low-battery scenario you trigger the red LED to
> run its low-battery-pattern and you don't touch it until there's a
> higher prio notification (e.g. someone connects the charger).

Yes, I have something like that, too.

https://gitlab.com/tui/tui/blob/master/ofone/watchdog.py

									Pavel

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