platform/x86: Toshiba WMI Hotkey Driver

Toshiba laptops that feature WMI events for hotkeys were left unsupported
by the toshiba_acpi driver, however, commit a88bc06e5a ("toshiba_acpi:
Avoid registering input device on WMI event laptops") added hardware
support for such laptops, but the hotkeys are not handled there.

This driver adds support for hotkey monitoring on certain Toshiba laptops
that manage the hotkeys via WMI events instead of the Toshiba
Configuration Interface (TCI).

The toshiba_acpi driver and this one can co-exist, as this only takes
care of hotkeys, while the proper takes care of hardware related stuff.

Currently the driver is under the EXPERIMENTAL flag, as the keymap
and the notify function are incomplete (due to lack of hardware to test).

Signed-off-by: Azael Avalos <coproscefalo@gmail.com>
Signed-off-by: Darren Hart <dvhart@linux.intel.com>

drivers/platform/x86/Kconfig

@@ -700,6 +700,24 @@ config TOSHIBA_HAPS
 	  If you have a recent Toshiba laptop with a built-in accelerometer
 	  device, say Y.
 
+config TOSHIBA_WMI
+	tristate "Toshiba WMI Hotkeys Driver (EXPERIMENTAL)"
+	default n
+	depends on ACPI_WMI
+	depends on INPUT
+	select INPUT_SPARSEKMAP
+	---help---
+	  This driver adds hotkey monitoring support to some Toshiba models
+	  that manage the hotkeys via WMI events.
+
+	  WARNING: This driver is incomplete as it lacks a proper keymap and the
+	  *notify function only prints the ACPI event type value. Be warned that
+	  you will need to provide some information if you have a Toshiba model
+	  with WMI event hotkeys and want to help with the develpment of this
+	  driver.
+
+	  If you have a WMI-based hotkeys Toshiba laptop, say Y or M here.
+
 config ACPI_CMPC
 	tristate "CMPC Laptop Extras"
 	depends on X86 && ACPI