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PI8042_SYNCH_READ_PORT callback function (ntdd8042.h)

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The PI8042_SYNCH_READ_PORT-typed callback routine does a synchronized read from an i8042 port. I8042prt supplies this callback.

Syntax

PI8042_SYNCH_READ_PORT Pi8042SynchReadPort;

NTSTATUS Pi8042SynchReadPort(
  [in]  PVOID Context,
  [out] PUCHAR Value,
  [in]  BOOLEAN WaitForACK
)
{...}

Parameters

[in] Context

Pointer to a context supplied by I8042prt.

[out] Value

Pointer to the UCHAR value returned by the routine.

[in] WaitForACK

Not used.

Return value

The PI8042_SYNCH_READ_PORT callback returns one of the following status values:

Return code Description
STATUS_SUCCESS
 The routine successfully returned a byte.
STATUS_IO_TIMEOUT
 The hardware was not ready for a read access.

Remarks

The PI8042_SYNCH_READ_PORT callback can only be used in a PI8042_KEYBOARD_INITIALIZATION_ROUTINE callback. I8042prt specifies the read port callback in the ReadPort parameter that I8042prt inputs to a keyboard initialization routine.

The routine polls the hardware until a read is returned by the hardware or an internal time-out occurs.

Requirements

Requirement Value
Target Platform Desktop
Header ntdd8042.h (include Ntdd8042.h)
IRQL PASSIVE_LEVEL

See also

PI8042_KEYBOARD_INITIALIZATION_ROUTINE

PI8042_SYNCH_WRITE_PORT