Re: Moving drivers/leds/dell-led.c to drivers/platform/x86

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Hi Michał,

I have no objections.

Best regards,
Jacek Anaszewski

On 06/13/2016 03:49 PM, Michał Kępień wrote:
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


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