linux-kernel - Re: [PATCH v4] Support intel-vbtn based tablet mode switch

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Date:   Fri, 26 Jan 2018 11:52:33 +0100
From:   Pali Rohár <pali.rohar@...il.com>
To:     Marco Martin <notmart@...il.com>
Cc:     linux-kernel@...r.kernel.org, mjg59@...f.ucam.org,
        dvhart@...radead.org, andy@...radead.org, bhush94@...il.com,
        platform-driver-x86@...r.kernel.org, mario.limonciello@...l.com,
        Mario Limonciello <mario_limonciello@...l.com>
Subject: Re: [PATCH v4] Support intel-vbtn based tablet mode switch

On Friday 26 January 2018 10:45:55 Marco Martin wrote:
> On martedì 23 gennaio 2018 16:18:24 CET Marco Martin wrote:
> > Some laptops such as Dell Inspiron 7000 series have the
> > tablet mode switch implemented in Intel ACPI,
> > the events to enter and exit the tablet mode are 0xCC and 0xCD
> > 
> > CC: platform-driver-x86@...r.kernel.org
> > CC: Matthew Garrett <mjg59@...f.ucam.org>
> > CC: "Pali Rohár" <pali.rohar@...il.com>
> > CC: Darren Hart <dvhart@...radead.org>
> > CC: Mario Limonciello <mario_limonciello@...l.com>
> > CC: Andy Shevchenko <andy@...radead.org>
> > 
> > Signed-off-by: Marco Martin <notmart@...il.com>
> > ---
> >  drivers/platform/x86/intel-vbtn.c | 21 +++++++++++++++++++++
> >  1 file changed, 21 insertions(+)
> > 
> > diff --git a/drivers/platform/x86/intel-vbtn.c
> > b/drivers/platform/x86/intel-vbtn.c index 58c5ff3..64b4b34 100644
> > --- a/drivers/platform/x86/intel-vbtn.c
> > +++ b/drivers/platform/x86/intel-vbtn.c
> > @@ -26,6 +26,9 @@
> >  #include <linux/suspend.h>
> >  #include <acpi/acpi_bus.h>
> > 
> > +/* When NOT in tablet mode, VBDS has the flag 0x40 */
> > +#define TABLET_MODE_FLAG 0x40
> > +
> >  MODULE_LICENSE("GPL");
> >  MODULE_AUTHOR("AceLan Kao");
> > 
> > @@ -42,6 +45,8 @@ static const struct key_entry intel_vbtn_keymap[] = {
> >  	{ KE_IGNORE, 0xC5, { KEY_VOLUMEUP } },		/* volume-up key release */
> >  	{ KE_KEY, 0xC6, { KEY_VOLUMEDOWN } },		/* volume-down key press */
> >  	{ KE_IGNORE, 0xC7, { KEY_VOLUMEDOWN } },	/* volume-down key release */
> > +	{ KE_SW,  0xCC, { .sw = { SW_TABLET_MODE, 1 } } }, /* Tablet mode in */
> > +	{ KE_SW,  0xCD, { .sw = { SW_TABLET_MODE, 0 } } }, /* Tablet mode out */
> >  	{ KE_END },
> >  };
> > 
> > @@ -88,6 +93,7 @@ static void notify_handler(acpi_handle handle, u32 event,
> > void *context)
> > 
> >  static int intel_vbtn_probe(struct platform_device *device)
> >  {
> > +	struct acpi_buffer vgbs_output = { ACPI_ALLOCATE_BUFFER, NULL };
> >  	acpi_handle handle = ACPI_HANDLE(&device->dev);
> >  	struct intel_vbtn_priv *priv;
> >  	acpi_status status;
> > @@ -110,6 +116,21 @@ static int intel_vbtn_probe(struct platform_device
> > *device) return err;
> >  	}
> > 
> > +	status = acpi_evaluate_object(handle, "VGBS", NULL, &vgbs_output);
> > +	/* VGBS being present and returning something means
> > +	 * we have a tablet mode switch
> > +	 */
> > +	if (ACPI_SUCCESS(status)) {
> > +		union acpi_object *obj = vgbs_output.pointer;
> > +
> > +		if (obj && obj->type == ACPI_TYPE_INTEGER) {
> > +			input_set_capability(priv->input_dev, EV_SW, SW_TABLET_MODE);
> > +			input_report_switch(priv->input_dev,
> > +								SW_TABLET_MODE,
> > +								!(obj->integer.value & TABLET_MODE_FLAG));
> > +		}
> > +	}
> > +
> >  	status = acpi_install_notify_handler(handle,
> >  					     ACPI_DEVICE_NOTIFY,
> >  					     notify_handler,
> 
> Is there still something to change in this version of the patch?

Yes, I already wrote it in thread for older patch version. Calling
input_set_capability() is not needed at all because all capabilities are
already set by sparse_keymap_setup() function.

-- 
Pali Rohár
pali.rohar@...il.com