linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: <Mario.Limonciello@dell.com>
To: <hdegoede@redhat.com>, <dvhart@infradead.org>, <andy@infradead.org>
Cc: <linux-acpi@vger.kernel.org>,
	<platform-driver-x86@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>
Subject: RE: [PATCH 4/5] platform/x86: intel-vbtn: Also handle tablet-mode switch on "Detachable" and "Portable" chassis-types
Date: Tue, 5 May 2020 14:22:05 +0000	[thread overview]
Message-ID: <afe7c366c97f4ab18d5a98a9695ceff6@AUSX13MPC101.AMER.DELL.COM> (raw)
In-Reply-To: <13a8ec94-1eae-4d95-7238-85c612ebc896@redhat.com>

> -----Original Message-----
> From: platform-driver-x86-owner@vger.kernel.org <platform-driver-x86-
> owner@vger.kernel.org> On Behalf Of Hans de Goede
> Sent: Tuesday, May 5, 2020 4:06 AM
> To: Limonciello, Mario; dvhart@infradead.org; andy@infradead.org
> Cc: linux-acpi@vger.kernel.org; platform-driver-x86@vger.kernel.org; linux-
> kernel@vger.kernel.org
> Subject: Re: [PATCH 4/5] platform/x86: intel-vbtn: Also handle tablet-mode
> switch on "Detachable" and "Portable" chassis-types
> 
> 
> [EXTERNAL EMAIL]
> 
> Hi,
> 
> On 5/4/20 5:37 PM, Mario.Limonciello@dell.com wrote:
> >
> >
> >> -----Original Message-----
> >> From: Hans de Goede <hdegoede@redhat.com>
> >> Sent: Saturday, May 2, 2020 1:30 PM
> >> To: Darren Hart; Andy Shevchenko; Limonciello, Mario
> >> Cc: Hans de Goede; linux-acpi@vger.kernel.org; platform-driver-
> >> x86@vger.kernel.org; linux-kernel@vger.kernel.org
> >> Subject: [PATCH 4/5] platform/x86: intel-vbtn: Also handle tablet-mode
> switch
> >> on "Detachable" and "Portable" chassis-types
> >>
> >>
> >> [EXTERNAL EMAIL]
> >>
> >> Commit de9647efeaa9 ("platform/x86: intel-vbtn: Only activate tablet mode
> >> switch on 2-in-1's") added a DMI chassis-type check to avoid accidentally
> >> reporting SW_TABLET_MODE = 1 to userspace on laptops.
> >>
> >> Some devices with a detachable keyboard and using the intel-vbnt (INT33D6)
> >> interface to report if they are in tablet mode (keyboard detached) or not,
> >> report 32 / "Detachable" as chassis-type, e.g. the HP Pavilion X2 series.
> >>
> >> Other devices with a detachable keyboard and using the intel-vbnt (INT33D6)
> >> interface to report SW_TABLET_MODE, report 8 / "Portable" as chassis-type.
> >> The Dell Venue 11 Pro 7130 is an example of this.
> >>
> >> Extend the DMI chassis-type check to also accept Portables and Detachables
> >> so that the intel-vbtn driver will report SW_TABLET_MODE on these devices.
> >>
> >> Note the chassis-type check was originally added to avoid a false-positive
> >> tablet-mode report on the Dell XPS 9360 laptop. To the best of my knowledge
> >> that laptop is using a chassis-type of 9 / "Laptop", so after this commit
> >> we still ignore the tablet-switch for that chassis-type.
> >
> > Yes that's correct.
> >
> >>
> >> Fixes: de9647efeaa9 ("platform/x86: intel-vbtn: Only activate tablet mode
> >> switch on 2-in-1's")
> >> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
> >> ---
> >> Looking at the Microsoft Windows documentation for tablet-mode reporting:
> >> https://docs.microsoft.com/en-us/windows-hardware/drivers/gpiobtn/button-
> >> implementation
> >>
> >> Then the presence of a tablet-mode switch is indicated by the presence
> >> of a PNP0C60 compatible ACPI devices. There are 2 ways in which this device
> >> can report the tablet-mode. 1. Directly providing a GpioInt resource inside
> >> the PNP0C60 device, 2. Through injecting events from a Windows driver.
> >>
> >> It seems that the intel-vbtn / the INT33D6 ACPI device is the ACPI side
> >> of Intel's generic solution for the case where the tablet-mode comes from
> >> the embedded-controller and needs to be "injected".
> >>
> >> This all suggests that it might be better to replace the chassis-type
> >> check with a acpi_dev_present("PNP0C60", NULL, -1) check.
> >>
> >> Mario, can you provide an acpidump and alsa-info.sh output for the
> >> Dell XPS 9360, so that I can check if that might help with the issue
> >> there, and thus is a potential candidate to replace the chassis-type
> >> check?
> >
> > Unfortunately with WFH right now, I don't have access to a XPS 9630 to
> > double check the patch series.
> >
> > However I do agree this should be a good approach.
> 
> Ok, so lets stick with the chassis-type check (as amended by this patch)
> for now then. Then once you are able to go to your office again, we
> can examine the acpi_dev_present("PNP0C60", NULL, -1) alternative.

I know XPS 13's are pretty popular, perhaps someone on the mailing list who has
one can share ACPI dump in the interim.

> 
> > Reviewed-by: Mario Limonciello <Mario.limonciello@dell.com>
> 
> Thank you.
> 
> Regards,
> 
> Hans
> 
> 
> 
> 
> >> ---
> >>   drivers/platform/x86/intel-vbtn.c | 12 +++++++++++-
> >>   1 file changed, 11 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/drivers/platform/x86/intel-vbtn.c b/drivers/platform/x86/intel-
> >> vbtn.c
> >> index 500fae82e12c..4921fc15dc6c 100644
> >> --- a/drivers/platform/x86/intel-vbtn.c
> >> +++ b/drivers/platform/x86/intel-vbtn.c
> >> @@ -158,12 +158,22 @@ static void detect_tablet_mode(struct platform_device
> >> *device)
> >>   static bool intel_vbtn_has_switches(acpi_handle handle)
> >>   {
> >>   	const char *chassis_type = dmi_get_system_info(DMI_CHASSIS_TYPE);
> >> +	unsigned long chassis_type_int;
> >>   	unsigned long long vgbs;
> >>   	acpi_status status;
> >>
> >> -	if (!(chassis_type && strcmp(chassis_type, "31") == 0))
> >> +	if (kstrtoul(chassis_type, 10, &chassis_type_int))
> >>   		return false;
> >>
> >> +	switch (chassis_type_int) {
> >> +	case  8: /* Portable */
> >> +	case 31: /* Convertible */
> >> +	case 32: /* Detachable */
> >> +		break;
> >> +	default:
> >> +		return false;
> >> +	}
> >> +
> >>   	status = acpi_evaluate_integer(handle, "VGBS", NULL, &vgbs);
> >>   	return ACPI_SUCCESS(status);
> >>   }
> >> --
> >> 2.26.0
> >


  reply	other threads:[~2020-05-05 14:22 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-02 18:29 [PATCH 0/5] platform/x86: intel-vbtn: Fixes + rework to make it work on more devices Hans de Goede
2020-05-02 18:29 ` [PATCH 1/5] platform/x86: intel-vbtn: Use acpi_evaluate_integer() Hans de Goede
2020-05-02 18:29 ` [PATCH 2/5] platform/x86: intel-vbtn: Split keymap into buttons and switches parts Hans de Goede
2020-05-02 18:29 ` [PATCH 3/5] platform/x86: intel-vbtn: Do not advertise switches to userspace if they are not there Hans de Goede
2020-05-02 18:29 ` [PATCH 4/5] platform/x86: intel-vbtn: Also handle tablet-mode switch on "Detachable" and "Portable" chassis-types Hans de Goede
2020-05-04 15:37   ` Mario.Limonciello
2020-05-05  9:05     ` Hans de Goede
2020-05-05 14:22       ` Mario.Limonciello [this message]
2020-05-05 14:27         ` Andy Shevchenko
2020-05-07 11:25           ` Hans de Goede
2020-05-02 18:29 ` [PATCH 5/5] platform/x86: intel-vbtn: Fix probe failure on devices with only switches Hans de Goede
2020-05-04 15:38 ` [PATCH 0/5] platform/x86: intel-vbtn: Fixes + rework to make it work on more devices Mario.Limonciello

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=afe7c366c97f4ab18d5a98a9695ceff6@AUSX13MPC101.AMER.DELL.COM \
    --to=mario.limonciello@dell.com \
    --cc=andy@infradead.org \
    --cc=dvhart@infradead.org \
    --cc=hdegoede@redhat.com \
    --cc=linux-acpi@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=platform-driver-x86@vger.kernel.org \
    --subject='RE: [PATCH 4/5] platform/x86: intel-vbtn: Also handle tablet-mode switch on "Detachable" and "Portable" chassis-types' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).