dsp_io.c File Reference

#include "precomp.h"

Include dependency graph for dsp_io.c:

Go to the source code of this file.

Functions
NTSTATUS	SbDspReset (IN PUCHAR BasePort, IN ULONG Timeout)
NTSTATUS	SbDspWaitToWrite (IN PUCHAR BasePort, IN ULONG Timeout)
NTSTATUS	SbDspWaitToRead (IN PUCHAR BasePort, IN ULONG Timeout)
NTSTATUS	SbDspWrite (IN PUCHAR BasePort, IN UCHAR DataByte, IN ULONG Timeout)
NTSTATUS	SbDspRead (IN PUCHAR BasePort, OUT PUCHAR DataByte, IN ULONG Timeout)

Function Documentation

SbDspRead()

NTSTATUS SbDspRead	(	IN PUCHAR	BasePort,
		OUT PUCHAR	DataByte,
		IN ULONG	Timeout
	)

Definition at line 120 of file dsp_io.c.

{
    NTSTATUS Status;
 
    if ( ! DataByte )
    {
        return STATUS_INVALID_PARAMETER_2;
    }
 
    Status = SbDspWaitToRead(BasePort, Timeout);
 
    if ( Status != STATUS_SUCCESS )
    {
        return Status;
    }
 
    *DataByte = READ_SB_DSP_DATA(BasePort);
    DbgPrint("SBDSP - Read %02x\n", *DataByte);
 
    return STATUS_SUCCESS;
}

Referenced by SbDspGetVersion(), and SbDspIsSpeakerEnabled().

SbDspReset()

NTSTATUS SbDspReset	(	IN PUCHAR	BasePort,
		IN ULONG	Timeout
	)

Definition at line 19 of file dsp_io.c.

{
    ULONG Expiry;
    BOOLEAN DataAvailable = FALSE;
 
    /* Should be called from DriverEntry with this IRQL */
    ASSERT(KeGetCurrentIrql() == PASSIVE_LEVEL);
 
    WRITE_SB_DSP_RESET(BasePort, 0x01);
    SleepMs(50);   /* Should be enough */
    WRITE_SB_DSP_RESET(BasePort, 0x00);
 
    Expiry = QuerySystemTimeMs() + Timeout;
 
    /* Wait for data to be available */
    while ( (QuerySystemTimeMs() < Expiry) || ( Timeout == 0) )
    {
        if ( SB_DSP_DATA_AVAILABLE(BasePort) )
        {
            DataAvailable = TRUE;
            break;
        }
    }
 
    if ( ! DataAvailable )
    {
        return STATUS_TIMEOUT;
    }
 
    /* Data is available - wait for the "DSP ready" code */
    while ( (QuerySystemTimeMs() < Expiry) || ( Timeout == 0) )
    {
        if ( READ_SB_DSP_DATA(BasePort) == SB_DSP_READY )
        {
            return STATUS_SUCCESS;
        }
    }
 
    return STATUS_TIMEOUT;
}

SbDspWaitToRead()

NTSTATUS SbDspWaitToRead	(	IN PUCHAR	BasePort,
		IN ULONG	Timeout
	)

Definition at line 81 of file dsp_io.c.

{
    ULONG Expiry = QuerySystemTimeMs() + Timeout;
 
    while ( (QuerySystemTimeMs() < Expiry) || (Timeout == 0) )
    {
        if ( SB_DSP_DATA_AVAILABLE(BasePort) )
        {
            return STATUS_SUCCESS;
        }
    }
 
    return STATUS_TIMEOUT;
}

Referenced by SbDspRead().

SbDspWaitToWrite()

NTSTATUS SbDspWaitToWrite	(	IN PUCHAR	BasePort,
		IN ULONG	Timeout
	)

Definition at line 63 of file dsp_io.c.

{
    ULONG Expiry = QuerySystemTimeMs() + Timeout;
 
    while ( (QuerySystemTimeMs() < Expiry) || (Timeout == 0) )
    {
        if ( SB_DSP_CLEAR_TO_SEND(BasePort) )
        {
            return STATUS_SUCCESS;
        }
    }
 
    return STATUS_TIMEOUT;
}

Referenced by SbDspWrite().

SbDspWrite()

NTSTATUS SbDspWrite	(	IN PUCHAR	BasePort,
		IN UCHAR	DataByte,
		IN ULONG	Timeout
	)

Definition at line 99 of file dsp_io.c.

{
    NTSTATUS Status;
 
    Status = SbDspWaitToWrite(BasePort, Timeout);
 
    if ( Status != STATUS_SUCCESS )
    {
        return Status;
    }
 
    DbgPrint("SBDSP - Writing %02x\n", DataByte);
    WRITE_SB_DSP_DATA(BasePort, DataByte);
 
    return STATUS_SUCCESS;
}

Referenced by SbDsp4SetInputRate(), SbDsp4SetOutputRate(), SbDsp4WriteRate(), SbDspDisableSpeaker(), SbDspEnableSpeaker(), SbDspGetVersion(), and SbDspIsSpeakerEnabled().