linux-kernel - Moving drivers/leds/dell-led.c to drivers/platform/x86

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Date:	Mon, 13 Jun 2016 15:49:42 +0200
From:	Michał Kępień <kernel@...pniu.pl>
To:	Richard Purdie <rpurdie@...ys.net>,
	Jacek Anaszewski <j.anaszewski@...sung.com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Pali Rohár <pali.rohar@...il.com>,
	Darren Hart <dvhart@...radead.org>
Cc:	Bob Rodgers <Robert_Rodgers@...l.com>,
	Louis Davis <Louis_Davis@...l.com>,
	Jim Dailey <Jim_Dailey@...l.com>,
	Alex Hung <alex.hung@...onical.com>,
	linux-leds@...r.kernel.org, platform-driver-x86@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Moving drivers/leds/dell-led.c to drivers/platform/x86

Hi everyone,

Back in January [1], while working on the dell-smbios module, I
suggested that the code present in drivers/leds/dell-led.c could be
moved to drivers/platform/x86 for coherency.  I decided to revisit that
idea.

dell-led consists of two major parts:

  - the part handling an "Activity LED" present in Dell Latitude 2100
    netbooks, introduced in 72dcd8d; it registers a LED device and uses
    a special WMI interface to control its state,

  - the part exposing a "microphone mute LED interface", introduced in
    db6d8cc; this interface is used by sound/pci/hda/dell_wmi_helper.c;
    while the original implementation also used a WMI interface, it was
    changed to use dell-smbios in cf0d7ea and 0c41a08.

I believe both parts could (and should) be moved to drivers/platform/x86
as drivers/platform/x86/dell-laptop.c already handles a bunch of LEDs
and drivers/leds/dell-led.c is the only dell-smbios user outside of
drivers/platform/x86.

My question to you, the maintainers of the relevant drivers and
subsystems, is whether you would like to see such a move happen.  I have
prepared a draft patch series which:

  - moves the "microphone mute LED interface" to dell-laptop.c,
    effectively causing sound/pci/hda/dell_wmi_helper.c to depend on
    CONFIG_DELL_LAPTOP instead of CONFIG_LEDS_DELL_NETBOOKS,

  - moves the "Activity LED" part to a new file, tentatively called
    drivers/platform/x86/dell-wmi-led.c.

Merging the "Activity LED" part with drivers/platform/x86/dell-wmi.c is
not really clean because dell-wmi handles a different GUID, which AFAIK
is not related in any way to the GUID used by dell-led.

So, before I spam *three* subsystem mailing lists with a bunch of
patches, I would love to hear from the maintainers of both drivers/leds
and drivers/platform/x86 whether there are any arguments against such a
move.  Meanwhile, I will keep polishing the patch series and if there is
no strong disagreement from any party involved, I will post the series
next week or so, so that we can discuss code and not just ideas.

As a side note, if anyone reading this has access to a Dell device which
has an "Activity LED" and/or a "microphone mute LED" currently supported
by dell-led, I would love to hear from you as I do not have the hardware
needed to practically test the patch series I am working on.

Looking forward to hearing from you,

[1] https://www.spinics.net/lists/platform-driver-x86/msg08143.html

-- 
Best regards,
Michał Kępień