> -----Original Message----- > From: platform-driver-x86-owner@xxxxxxxxxxxxxxx [mailto:platform-driver-x86- > owner@xxxxxxxxxxxxxxx] On Behalf Of Marco Martin > Sent: Tuesday, January 23, 2018 6:42 AM > To: linux-kernel@xxxxxxxxxxxxxxx > Cc: mjg59@xxxxxxxxxxxxx; pali.rohar@xxxxxxxxx; dvhart@xxxxxxxxxxxxx; > andy@xxxxxxxxxxxxx; bhush94@xxxxxxxxx; platform-driver-x86@xxxxxxxxxxxxxxx; > Limonciello, Mario <Mario_Limonciello@xxxxxxxx>; Marco Martin > <notmart@xxxxxxxxx>; Limonciello, Mario <Mario_Limonciello@xxxxxxxx> > Subject: [PATCH v3] Support intel-vbtn based tablet mode switch > > 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@xxxxxxxxxxxxxxx > CC: Matthew Garrett <mjg59@xxxxxxxxxxxxx> > CC: "Pali Rohár" <pali.rohar@xxxxxxxxx> > CC: Darren Hart <dvhart@xxxxxxxxxxxxx> > CC: Mario Limonciello <mario_limonciello@xxxxxxxx> > CC: Andy Shevchenko <andy@xxxxxxxxxxxxx> > > Signed-off-by: Marco Martin <notmart@xxxxxxxxx> > --- > 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 Minor typographical error here, you mean VGBS output not VDBS right? VDBS may be implementation specific, you're explicitly looking at VGBS. > + > 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, > -- > 2.7.4
