Hi Lauro, Aloisio, Samuel, all,
We would like to implement the NFC Controller Interface (NCI) protocol for the NFC subsystem.
The NCI is a standard communication protocol between an NFC Controller (NFCC) and a Device Host (DH), defined by the NFC Forum.
The NCI protocol implementation will be chip independent and responsible for:
- Reset, initialization and configuration of the NFC controller
- Sending commands/data to the NFC controller
- Receiving responses/notifications/data from the NFC controller
- Flow control for Control and Data Messages
- Segmentation and reassembly for Control and Data Messages
- An addressing scheme for NFC Execution Environments (NFCEE), e.g. secure element
- An addressing scheme for Remote NFC Endpoints (NFCEE or RF targets) (via logical connections)
The NCI protocol will be added to the NFC subsystem below the NFC core:
+--------------------------------------+
| USER SPACE |
+--------------------------------------+
^ ^
| low-level | control
| data exchange | operations
| |
| v
| +-----------+
| AF_NFC | netlink |
| socket +-----------+
| raw ^
| |
v v
+---------+ +-----------+
| rawsock | <---------> | NFC core |
+---------+ +-----------+
^
|
v
+-----------+
| NCI core |
+-----------+
^
|
V
+-----------+
| driver |
+-----------+
The driver will register itself to the NCI core, and in turn the NCI core will register itself to the NFC core.
We need to add the following 2 control operations (via generic netlink):
- Dev_up, which turn on the NFC controller (this operation may take a few seconds, as it can download new FW to the NFC controller)
- Dev_down, which turn off the NFC controller
The dev_up/down approach was also used with HCI protocol in the BlueZ project.
We suggest placing the NCI code in the net\nfc folder (beside the NFC code), as it's a generic and chip independent protocol, and not a driver.
This approach was also used with HCI protocol in the BlueZ project.
The driver itself will be located at drivers\nfc folder.
The NCI code will be divided in a few files, e.g. nci_core, nci_rsp, nci_ntf etc.
We'll appreciate your comments.
Thanks & BR
Ilan Elias
Texas Instruments
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