reactos/drivers/multimedia/audio/sndblst/portio.c

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/*
*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
* FILE: drivers/dd/sndblst/portio.c (see also sndblst.h)
* PURPOSE: Sound Blaster port I/O helper
* PROGRAMMER: Andrew Greenwood
* UPDATE HISTORY:
* Sept 28, 2003: Created
*/
#include <ntddk.h>
#include "sndblst.h"
BOOLEAN WaitToSend(ULONG BasePort)
{
int TimeOut;
DPRINT("WaitToSend ");
// Check if it's OK to send
for (TimeOut = SB_TIMEOUT;
! SB_READY_TO_SEND(BasePort) && TimeOut > 0;
TimeOut --);
// If a time-out occurs, we report failure
if (! TimeOut)
{
DPRINT("FAILED\n");
return FALSE;
}
DPRINT("SUCCEEDED\n");
return TRUE;
}
BOOLEAN WaitToReceive(ULONG BasePort)
{
int TimeOut;
DPRINT("WaitToReceive ");
// Check if it's OK to receive
for (TimeOut = SB_TIMEOUT;
! SB_READY_TO_RECEIVE(BasePort) && TimeOut > 0;
TimeOut --);
// If a time-out occurs, we report failure
if (! TimeOut)
{
DPRINT("FAILED\n");
return FALSE;
}
DPRINT("SUCCEEDED\n");
return TRUE;
}
USHORT InitSoundCard(ULONG BasePort)
{
ULONG TimeOut;
BOOLEAN Status;
UCHAR DSP_Major, DSP_Minor;
DPRINT("InitSoundCard() called\n");
DPRINT("Resetting sound card\n");
// if (!WaitToSend(BasePort))
// return FALSE;
SB_WRITE_RESET(BasePort, 0x01);
for (TimeOut = 0; TimeOut < 30000; TimeOut ++); // Wait a while
SB_WRITE_RESET(BasePort, 0x00);
// Check if it's OK to receive (some cards will ignore the above reset
// command and so will not issue an ACK, so time out is NOT an error)
DPRINT("Waiting for an ACK\n");
if (WaitToReceive(BasePort))
{
// Check to make sure the reset was acknowledged:
for (TimeOut = SB_TIMEOUT;
(Status = (SB_READ_DATA(BasePort) != SB_DSP_READY) && (TimeOut > 0));
TimeOut --);
}
DPRINT("Querying DSP version\n");
if (! WaitToSend(BasePort))
return FALSE;
SB_WRITE_DATA(BasePort, SB_GET_DSP_VERSION);
if (! WaitToReceive(BasePort))
return FALSE;
DSP_Major = SB_READ_DATA(BasePort);
DSP_Minor = SB_READ_DATA(BasePort);
DPRINT("DSP v%d.%d\n", DSP_Major, DSP_Minor);
// if audio is disabled,
// version tests return 0xFF everywhere
if (DSP_Major == 0xFF && DSP_Minor == 0xFF)
return FALSE;
DPRINT("Sound card initialized!\n");
return (DSP_Major * 256) + DSP_Minor;
}