linux-kernel - Re: [PATCH v2 1/2] leds: Add Intel Cherry Trail Whiskey Cove PMIC LEDs

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Message-ID: <20190214112858.GG6132@amd>
Date:   Thu, 14 Feb 2019 12:28:58 +0100
From:   Pavel Machek <pavel@....cz>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     Yauhen Kharuzhy <jekhor@...il.com>, linux-kernel@...r.kernel.org,
        linux-leds@...r.kernel.org
Subject: Re: [PATCH v2 1/2] leds: Add Intel Cherry Trail Whiskey Cove PMIC
 LEDs

Hi!

> >>Basically the charge led has 3 states:
> >>
> >>1) Off
> >>2) On
> >>3) On when charging
> >>
> >>And then when on it has 4 patterns:
> >>
> >>1) Permanently off (so still not really on)
> >>2) Permanently on
> >>3) Blinking
> >>4) Breathing
> >
> >Ok, so you don't really need to support _both_ off methods.
> >
> >Still sounds like a normal LED, with special "yoga-charging" and
> >"yoga-breathing" triggers. (All the normal triggers should still work,
> >too.)
> 
> Except that when in yoga-charging mode, the user should
> still be able to select if the LED is simply on when charging,
> blinking when charging, or breathing when charging.

BTW... all this should really go in the comment to the top of the
file. It is non-trivial.

> >>The problem is that any changes made are permanent, they
> >>survice reboots and the default is Breathing, so we need
> >>a way to restore that which does not involve removing
> >>the internal battery of these devices.

As should this.... as it is quite unusual.

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

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