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

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Date:	Wed, 19 Nov 2014 20:51:28 +0100
From:	Pali Rohár <pali.rohar@...il.com>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	Darren Hart <dvhart@...radead.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,
	Gabriele Mazzotta <gabriele.mzt@...il.com>
Subject: Re: [PATCH] platform: x86: dell-laptop: Add support for keyboard backlight

On Wednesday 19 November 2014 20:23:36 Matthew Garrett wrote:
> On Wed, Nov 19, 2014 at 10:34:16AM -0800, Darren Hart wrote:
> > I'm somewhat concerned that this patch doubles the size of
> > this driver. When we're adding this much code, I have to
> > ask - does it make sense to grow this driver rather than
> > create a new one?
> 
> There'd be a fair amount of code duplication in splitting it.
> 

Yes. dell-laptop.ko implements functions for doing Dell SMBIOS 
calls which are needed for keyboard backlight.

> > There is no ACPI backlight driver on these systems? We need
> > a platform driver?
> 
> ACPI doesn't specify keyboard backlight control, so this ends
> up being very vendor specific.

dell-laptop.ko is not ACPI driver. It is using Dell SMBIOS calls. 
And I do not know about Dell specific ACPI interface for keyboard 
backlight. So Darren, ask this question someone from Dell.

-- 
Pali Rohár
pali.rohar@...il.com

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