linux-kernel - Re: [PATCH v3 1/3] leds: core: Introduce generic pattern interface

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Date:   Tue, 21 Nov 2017 00:20:15 +0100
From:   Pavel Machek <pavel@....cz>
To:     Greg KH <greg@...ah.com>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Richard Purdie <rpurdie@...ys.net>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org, Fenglin Wu <fenglinw@...eaurora.org>
Subject: Re: [PATCH v3 1/3] leds: core: Introduce generic pattern interface

On Wed 2017-11-15 08:36:42, Greg KH wrote:
> On Tue, Nov 14, 2017 at 11:13:43PM -0800, Bjorn Andersson wrote:
> > Some LED controllers have support for autonomously controlling
> > brightness over time, according to some preprogrammed pattern or
> > function.
> > 
> > This adds a new optional operator that LED class drivers can implement
> > if they support such functionality as well as a new device attribute to
> > configure the pattern for a given LED.
> > 
> > Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> > ---
> > 
> > Changes since v2:
> > - None
> > 
> > Changes since v1:
> > - New patch, based on discussions following v1
> > 
> >  Documentation/ABI/testing/sysfs-class-led |  20 ++++
> >  drivers/leds/led-class.c                  | 150 ++++++++++++++++++++++++++++++
> >  include/linux/leds.h                      |  21 +++++
> >  3 files changed, 191 insertions(+)
> > 
> > diff --git a/Documentation/ABI/testing/sysfs-class-led b/Documentation/ABI/testing/sysfs-class-led
> > index 5f67f7ab277b..74a7f5b1f89b 100644
> > --- a/Documentation/ABI/testing/sysfs-class-led
> > +++ b/Documentation/ABI/testing/sysfs-class-led
> > @@ -61,3 +61,23 @@ Description:
> >  		gpio and backlight triggers. In case of the backlight trigger,
> >  		it is useful when driving a LED which is intended to indicate
> >  		a device in a standby like state.
> > +
> > +What:		/sys/class/leds/<led>/pattern
> > +Date:		July 2017
> 
> That was many months ago :)
> 
> > +KernelVersion:	4.14
> 
> And that kernel version is long since released :)

Yeah, the other problem is it has some interesting format with ":|"
marking repeat, and is not really suitable for RGB LEDs...

I'd really prefer to get driver in first, and add pattern interface
later.

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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