linux-kernel - Re: [PATCH v2] platform: x86: dell-laptop: Add support for keyboard backlight

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Message-Id: <201412050253.35324@pali>
Date:	Fri, 5 Dec 2014 02:53:35 +0100
From:	Pali Rohár <pali.rohar@...il.com>
To:	Darren Hart <dvhart@...radead.org>
Cc:	Gabriele Mazzotta <gabriele.mzt@...il.com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
	libsmbios-devel@...ts.us.dell.com, Srinivas_G_Gowda@...l.com,
	Michael_E_Brown@...l.com
Subject: Re: [PATCH v2] platform: x86: dell-laptop: Add support for keyboard backlight

On Wednesday 03 December 2014 12:51:37 Darren Hart wrote:
> On Thu, Dec 04, 2014 at 09:50:02AM +0100, Gabriele Mazzotta 
wrote:
> > On Wednesday 03 December 2014 00:43:21 Darren Hart wrote:
> > > > +     int kbd_timeouts[];
> > > > 
> > > >  };
> > > >  
> > > >  static struct quirk_entry *quirks;
> > > > 
> > > > @@ -76,6 +89,10 @@ static int __init dmi_matched(const
> > > > struct dmi_system_id *dmi)>
> > > > 
> > > >       return 1;
> > > >  
> > > >  }
> > > > 
> > > > +static struct quirk_entry quirk_dell_xps13_9333 = {
> > > > +     .kbd_timeouts = { 0, 5, 15, 60, 5*60, 15*60, -1 },
> > > 
> > > Where did these values come from? Were they documented in
> > > the libsmbios project? Can you provide a URL to that?
> > > These really should be described by the firmware, but if
> > > they aren't, nothing we can do about it.
> > 
> > I took those values from a Windows utility provided by Dell.
> > I tried to find a reason for that specific list to exist,
> > but I couldn't. The reason why it's there is that the BIOS
> > of my laptop accepts any timeout, but it silently sets the
> > timeout to 0 (i.e. illumination never off) if a value not
> > in that list is given. So, given the wide range of of
> > possible input values, we added that quirk. This is
> > something my laptop does, Pali's behaves differently and
> > such a list is not needed.
> 
> Let's get a comment above the quirk describing the scenario.

Ok, I will add comment above quirk.

-- 
Pali Rohár
pali.rohar@...il.com

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