NFC: add nfc subsystem core

The NFC subsystem core is responsible for providing the device driver
interface. It is also responsible for providing an interface to the control
operations and data exchange.

Signed-off-by: Lauro Ramos Venancio <lauro.venancio@openbossa.org>
Signed-off-by: Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/nfc/Kconfig

@@ -2,17 +2,8 @@
 # Near Field Communication (NFC) devices
 #
 
-menuconfig NFC_DEVICES
-	bool "Near Field Communication (NFC) devices"
-	default n
-	---help---
-	  You'll have to say Y if your computer contains an NFC device that
-	  you want to use under Linux.
-
-	  You can say N here if you don't have any Near Field Communication
-	  devices connected to your computer.
-
-if NFC_DEVICES
+menu "Near Field Communication (NFC) devices"
+	depends on NFC
 
 config PN544_NFC
 	tristate "PN544 NFC driver"
@@ -26,5 +17,4 @@ config PN544_NFC
 	  To compile this driver as a module, choose m here. The module will
 	  be called pn544.
 
-
-endif # NFC_DEVICES
+endmenu

drivers/nfc/Makefile

@@ -3,3 +3,5 @@
 #
 
 obj-$(CONFIG_PN544_NFC)		+= pn544.o
+
+ccflags-$(CONFIG_NFC_DEBUG) := -DDEBUG