NFC: Driver for NXP Semiconductors PN544 NFC chip.

Creates a new "Near Field Communication" subsystem in drivers/nfc.
http://en.wikipedia.org/wiki/Near_Field_Communication is useful ;)

This is a driver for the pn544 NFC device. The driver transfers
ETSI messages between the device and the user space.

Signed-off-by: Matti J. Aaltonen <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

Documentation/nfc/nfc-pn544.txt

@@ -0,0 +1,114 @@
+Kernel driver for the NXP Semiconductors PN544 Near Field
+Communication chip
+
+Author: Jari Vanhala
+Contact: Matti Aaltonen (matti.j.aaltonen at nokia.com)
+
+General
+-------
+
+The PN544 is an integrated transmission module for contactless
+communication. The driver goes under drives/nfc/ and is compiled as a
+module named "pn544". It registers a misc device and creates a device
+file named "/dev/pn544".
+
+Host Interfaces: I2C, SPI and HSU, this driver supports currently only I2C.
+
+The Interface
+-------------
+
+The driver offers a sysfs interface for a hardware test and an IOCTL
+interface for selecting between two operating modes. There are read,
+write and poll functions for transferring messages. The two operating
+modes are the normal (HCI) mode and the firmware update mode.
+
+PN544 is controlled by sending messages from the userspace to the
+chip. The main function of the driver is just to pass those messages
+without caring about the message content.
+
+
+Protocols
+---------
+
+In the normal (HCI) mode and in the firmware update mode read and
+write functions behave a bit differently because the message formats
+or the protocols are different.
+
+In the normal (HCI) mode the protocol used is derived from the ETSI
+HCI specification. The firmware is updated using a specific protocol,
+which is different from HCI.
+
+HCI messages consist of an eight bit header and the message body. The
+header contains the message length. Maximum size for an HCI message is
+33. In HCI mode sent messages are tested for a correct
+checksum. Firmware update messages have the length in the second (MSB)
+and third (LSB) bytes of the message. The maximum FW message length is
+1024 bytes.
+
+For the ETSI HCI specification see
+http://www.etsi.org/WebSite/Technologies/ProtocolSpecification.aspx
+
+The Hardware Test
+-----------------
+
+The idea of the test is that it can performed by reading from the
+corresponding sysfs file. The test is implemented in the board file
+and it should test that PN544 can be put into the firmware update
+mode. If the test is not implemented the sysfs file does not get
+created.
+
+Example:
+> cat /sys/module/pn544/drivers/i2c\:pn544/3-002b/nfc_test
+1
+
+Normal Operation
+----------------
+
+PN544 is powered up when the device file is opened, otherwise it's
+turned off. Only one instance can use the device at a time.
+
+Userspace applications control PN544 with HCI messages. The hardware
+sends an interrupt when data is available for reading. Data is
+physically read when the read function is called by a userspace
+application. Poll() checks the read interrupt state. Configuration and
+self testing are also done from the userspace using read and write.
+
+Example platform data:
+
+static int rx71_pn544_nfc_request_resources(struct i2c_client *client)
+{
+	/* Get and setup the HW resources for the device */
+}
+
+static void rx71_pn544_nfc_free_resources(void)
+{
+	/* Release the HW resources */
+}
+
+static void rx71_pn544_nfc_enable(int fw)
+{
+	/* Turn the device on */
+}
+
+static int rx71_pn544_nfc_test(void)
+{
+	/*
+	 * Put the device into the FW update mode
+	 * and then back to the normal mode.
+	 * Check the behavior and return one on success,
+	 * zero on failure.
+	 */
+}
+
+static void rx71_pn544_nfc_disable(void)
+{
+	/* turn the power off */
+}
+
+static struct pn544_nfc_platform_data rx71_nfc_data = {
+	.request_resources = rx71_pn544_nfc_request_resources,
+	.free_resources = rx71_pn544_nfc_free_resources,
+	.enable = rx71_pn544_nfc_enable,
+	.test = rx71_pn544_nfc_test,
+	.disable = rx71_pn544_nfc_disable,
+};

drivers/Kconfig

@@ -88,6 +88,8 @@ source "drivers/memstick/Kconfig"
 
 source "drivers/leds/Kconfig"
 
+source "drivers/nfc/Kconfig"
+
 source "drivers/accessibility/Kconfig"
 
 source "drivers/infiniband/Kconfig"

drivers/Makefile

@@ -40,7 +40,7 @@ obj-$(CONFIG_FB_INTEL)          += video/intelfb/
 
 obj-y				+= serial/
 obj-$(CONFIG_PARPORT)		+= parport/
-obj-y				+= base/ block/ misc/ mfd/
+obj-y				+= base/ block/ misc/ mfd/ nfc/
 obj-$(CONFIG_NUBUS)		+= nubus/
 obj-y				+= macintosh/
 obj-$(CONFIG_IDE)		+= ide/

drivers/nfc/Kconfig

@@ -0,0 +1,30 @@
+#
+# Near Field Communication (NFC) devices
+#
+
+menuconfig NFC_DEVICES
+	bool "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
+
+config PN544_NFC
+	tristate "PN544 NFC driver"
+	depends on I2C
+	select CRC_CCITT
+	default n
+	---help---
+	  Say yes if you want PN544 Near Field Communication driver.
+	  This is for i2c connected version. If unsure, say N here.
+
+	  To compile this driver as a module, choose m here. The module will
+	  be called pn544.
+
+
+endif # NFC_DEVICES

drivers/nfc/Makefile

@@ -0,0 +1,5 @@
+#
+# Makefile for nfc devices
+#
+
+obj-$(CONFIG_PN544_NFC)		+= pn544.o