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Example sequence

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The following is an example sequence of IOCTLs in the Smart Card resource manager:

Start-up sequence

  1. Use the DevObj or CfgMgr API with the Smart Card access device interface GUID to discover the NFC device driver's name, and use it with CreateFile to open a device handle.

  2. Initialize thread pool.

  3. Determine reader name.

    • IOCTL_SMARTCARD_GET_ATTRIBUTE on SCARD_ATTR_VENDOR_NAME, SCARD_ATTR_VENDOR_IFD_TYPE, and SCARD_ATTR_DEVICE_UNIT

  4. Determine reader characteristics.

    • IOCTL_SMARTCARD_GET_ATTRIBUTE on SCARD_ATTR_CHARACTERISTICS

  5. Start the card state monitor.

    • IOCTL_SMARTCARD_IS_PRESENT – To wait for a smart card arrival.

    • IOCTL_SMARTCARD_IS_ABSENT – To wait for the smart card departure.

The Power reset is irrelevant since we do not support SCARD_SWALLOWED, SCARD_POWERED state.

Connect sequence

  1. Start of loop.

  2. IOCTL_SMARTCARD_GET_STATE

    • Case SCARD_UNKNOWN and SCARD_ABSENT, do nothing

    • Case SCARD_PRESENT, swallow card

    • Case SCARD_SWALLOWED, cold reset

    • Case SCARD_POWERED, warm reset

    • Case SCARD_NEGOTIABLE, determine the card ATR

    • Case SCARD_SPECIFIC, determine the card ATR and protocol

  3. IOCTL_SMARTCARD_SET_PROTOCOL

Disconnect sequence

  1. Power-down timeout starts.

  2. Start of loop.

  3. IOCTL_SMARTCARD_GET_STATE

    • Case SCARD_SPECIFIC, SCARD_NEGOTIABLE, SCARD_POWERED, set power down

    • Case SCARD_SWALLOWED, SCARD_PRESENT, do nothing

    • Case SCARD_ABSENT, SCARD_UNKNOWN, do nothing