path: root/Documentation/nfc/nfc-pn544.txt
diff options
Diffstat (limited to 'Documentation/nfc/nfc-pn544.txt')
1 files changed, 32 insertions, 0 deletions
diff --git a/Documentation/nfc/nfc-pn544.txt b/Documentation/nfc/nfc-pn544.txt
new file mode 100644
index 00000000..b36ca14c
--- /dev/null
+++ b/Documentation/nfc/nfc-pn544.txt
@@ -0,0 +1,32 @@
+Kernel driver for the NXP Semiconductors PN544 Near Field
+Communication chip
+The PN544 is an integrated transmission module for contactless
+communication. The driver goes under drives/nfc/ and is compiled as a
+module named "pn544".
+Host Interfaces: I2C, SPI and HSU, this driver supports currently only I2C.
+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