• Thierry Escande's avatar
    NFC: Digital Protocol stack implementation · 4b10884e
    Thierry Escande authored
    This is the initial commit of the NFC Digital Protocol stack
    implementation.
    
    It offers an interface for devices that don't have an embedded NFC
    Digital protocol stack. The driver instantiates the digital stack by
    calling nfc_digital_allocate_device(). Within the nfc_digital_ops
    structure, the driver specifies a set of function pointers for driver
    operations. These functions must be implemented by the driver and are:
    
    in_configure_hw:
    Hardware configuration for RF technology and communication framing in
    initiator mode. This is a synchronous function.
    
    in_send_cmd:
    Initiator mode data exchange using RF technology and framing previously
    set with in_configure_hw. The peer response is returned through
    callback cb. If an io error occurs or the peer didn't reply within the
    specified timeout (ms), the error code is passed back through the resp
    pointer. This is an asynchronous function.
    
    tg_configure_hw:
    Hardware configuration for RF technology and communication framing in
    target mode. This is a synchronous function.
    
    tg_send_cmd:
    Target mode data exchange using RF technology and framing previously
    set with tg_configure_hw. The peer next command is returned through
    callback cb. If an io error occurs or the peer didn't reply within the
    specified timeout (ms), the error code is passed back through the resp
    pointer. This is an asynchronous function.
    
    tg_listen:
    Put the device in listen mode waiting for data from the peer device.
    This is an asynchronous function.
    
    tg_listen_mdaa:
    If supported, put the device in automatic listen mode with mode
    detection and automatic anti-collision. In this mode, the device
    automatically detects the RF technology and executes the
    anti-collision detection using the command responses specified in
    mdaa_params. The mdaa_params structure contains SENS_RES, NFCID1, and
    SEL_RES for 106A RF tech. NFCID2 and system code (sc) for 212F and
    424F. The driver returns the NFC-DEP ATR_REQ command through cb. The
    digital stack deducts the RF tech by analyzing the SoD of the frame
    containing the ATR_REQ command. This is an asynchronous function.
    
    switch_rf:
    Turns device radio on or off. The stack does not call explicitly
    switch_rf to turn the radio on. A call to in|tg_configure_hw must turn
    the device radio on.
    
    abort_cmd:
    Discard the last sent command.
    
    Then the driver registers itself against the digital stack by using
    nfc_digital_register_device() which in turn registers the digital stack
    against the NFC core layer. The digital stack implements common NFC
    operations like dev_up(), dev_down(), start_poll(), stop_poll(), etc.
    
    This patch is only a skeleton and NFC operations are just stubs.
    Signed-off-by: default avatarThierry Escande <thierry.escande@linux.intel.com>
    Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
    4b10884e
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