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1============================================================================2Kernel driver for the NXP Semiconductors PN544 Near Field Communication chip3============================================================================4 5 6General7-------8 9The PN544 is an integrated transmission module for contactless10communication. The driver goes under drives/nfc/ and is compiled as a11module named "pn544".12 13Host Interfaces: I2C, SPI and HSU, this driver supports currently only I2C.14 15Protocols16---------17 18In the normal (HCI) mode and in the firmware update mode read and19write functions behave a bit differently because the message formats20or the protocols are different.21 22In the normal (HCI) mode the protocol used is derived from the ETSI23HCI specification. The firmware is updated using a specific protocol,24which is different from HCI.25 26HCI messages consist of an eight bit header and the message body. The27header contains the message length. Maximum size for an HCI message is2833. In HCI mode sent messages are tested for a correct29checksum. Firmware update messages have the length in the second (MSB)30and third (LSB) bytes of the message. The maximum FW message length is311024 bytes.32 33For the ETSI HCI specification see34http://www.etsi.org/WebSite/Technologies/ProtocolSpecification.aspx35