NFC: pn533: Separate physical layer from the core implementation

The driver now has all core stuff isolated in one file, and all
the hardware link specifics in another. Writing a pn533 driver
on top of another hardware link is now just a matter of adding a
new file for that new hardware specifics.

The first user of this separation will be the i2c based pn532
driver that reuses pn533 core implementation on top of an i2c
layer.

Signed-off-by: Michael Thalmeier <michael.thalmeier@hale.at>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/nfc/Kconfig

@@ -5,16 +5,6 @@
 menu "Near Field Communication (NFC) devices"
 	depends on NFC
 
-config NFC_PN533
-	tristate "NXP PN533 USB driver"
-	depends on USB
-	help
-	  NXP PN533 USB driver.
-	  This driver provides support for NFC NXP PN533 devices.
-
-	  Say Y here to compile support for PN533 devices into the
-	  kernel or say M to compile it as module (pn533).
-
 config NFC_WILINK
 	tristate "Texas Instruments NFC WiLink driver"
 	depends on TI_ST && NFC_NCI
@@ -70,6 +60,7 @@ config NFC_PORT100
 
 source "drivers/nfc/fdp/Kconfig"
 source "drivers/nfc/pn544/Kconfig"
+source "drivers/nfc/pn533/Kconfig"
 source "drivers/nfc/microread/Kconfig"
 source "drivers/nfc/nfcmrvl/Kconfig"
 source "drivers/nfc/st21nfca/Kconfig"

drivers/nfc/Makefile

@@ -5,7 +5,7 @@
 obj-$(CONFIG_NFC_FDP)		+= fdp/
 obj-$(CONFIG_NFC_PN544)		+= pn544/
 obj-$(CONFIG_NFC_MICROREAD)	+= microread/
-obj-$(CONFIG_NFC_PN533)		+= pn533.o
+obj-$(CONFIG_NFC_PN533)		+= pn533/
 obj-$(CONFIG_NFC_WILINK)	+= nfcwilink.o
 obj-$(CONFIG_NFC_MEI_PHY)	+= mei_phy.o
 obj-$(CONFIG_NFC_SIM)		+= nfcsim.o

drivers/nfc/pn533/Kconfig

@@ -0,0 +1,16 @@
+config NFC_PN533
+	tristate
+	help
+	  NXP PN533 core driver.
+	  This driver provides core functionality for NXP PN533 NFC devices.
+
+config NFC_PN533_USB
+	tristate "NFC PN533 device support (USB)"
+	depends on USB
+	select NFC_PN533
+	---help---
+	  This module adds support for the NXP pn533 USB interface.
+	  Select this if your platform is using the USB bus.
+
+	  If you choose to build a module, it'll be called pn533_usb.
+	  Say N if unsure.

drivers/nfc/pn533/Makefile

@@ -0,0 +1,7 @@
+#
+# Makefile for PN533 NFC driver
+#
+pn533_usb-objs  = usb.o
+
+obj-$(CONFIG_NFC_PN533)     += pn533.o
+obj-$(CONFIG_NFC_PN533_USB) += pn533_usb.o