linux-kernel - Re: [PATCH] platform/x86: Add Driver to set up lid GPEs on MS Surface device

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Date:   Sat, 12 Sep 2020 00:46:30 +0200
From:   Maximilian Luz <luzmaximilian@...il.com>
To:     mgross@...ux.intel.com
Cc:     Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Gayatri Kammela <gayatri.kammela@...el.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        platform-driver-x86@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] platform/x86: Add Driver to set up lid GPEs on MS Surface
 device

On 9/12/20 12:10 AM, mark gross wrote:
> Surface devices are tablets with detachable keyboards.  they don't really
> have a "lid" as the tablet is the "lid".

The Surface Laptop series doesn't have a detachable keyboard, yet still
requires this. Arguably, the Surface Books are also more laptop than
tablet (at least that's the way I use mine...). Finally, on the actual
tablets (Surface Pro series) the lid switch detects when the keyboard
cover is opened (or at least that's what I have been told, I don't
own/have access to a Pro series device).

Regardless of that, this patch is intended to provide the same behavior
as found on Windows, for all devices included in this patch, which is:
When you open the lid, or in case of the Pro series fold away the
keyboard cover, the device wakes from suspend/s2idle. Without this
patch, that doesn't work.

> I'm just questioning if the creator of the device designed it the way they did
> maybe we should think twice about doing this.

As far as I can tell, the intended behavior is to wake the device when
the lid is opened, which on the Laptops and Books is a more conventional
lid and on the Pros constitutes opening the cover.

I'm open for any alternative though.

Also please note that I've already sent a v2 of this patch with Andy's
comments addressed: https://lore.kernel.org/patchwork/patch/1303997/

--
Regards,
Max