Input: add driver for SOC button array

This patch adds support for the GPIO buttons on some Intel Bay Trail
tablets originally running Windows 8. The ACPI description of these
buttons follows "Windows ACPI Design Guide for SoC Platforms".

Signed-off-by: Lejun Zhu <lejun.zhu@linux.intel.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/misc/Kconfig

@@ -666,4 +666,14 @@ config INPUT_IDEAPAD_SLIDEBAR
 	  To compile this driver as a module, choose M here: the
 	  module will be called ideapad_slidebar.
 
+config INPUT_SOC_BUTTON_ARRAY
+	tristate "Windows-compatible SoC Button Array"
+	depends on KEYBOARD_GPIO
+	help
+	  Say Y here if you have a SoC-based tablet that originally
+	  runs Windows 8.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called soc_button_array.
+
 endif