/* -*- tab-width: 8; c-basic-offset: 4 -*- */

/*
 * WINE Drivers functions
 *
 * Copyright 1994 Martin Ayotte
 * Copyright 1998 Marcus Meissner
 * Copyright 1999 Eric Pouech
 */

#include <string.h>
#ifdef __WIN32OS2__
#include "winbase.h"
#include "winerror.h"
#include "windef.h"
#include "wingdi.h"
#include "winuser.h"
#include <mmddk.h>
#include <mmsystem.h>
#include "winemm.h"
#include <heapstring.h>
#define inline
#else
#include "heap.h"
#include "windef.h"
#include "mmddk.h"
#include "winemm.h"
#include "wine/winbase16.h"
#endif
#include "debugtools.h"

DEFAULT_DEBUG_CHANNEL(driver);

static LPWINE_DRIVER	lpDrvItemList = NULL;

/* TODO list :
 *	- LoadModule count and clean up is not handled correctly (it's not a 
 *	  problem as long as FreeLibrary is not working correctly)
 */

/**************************************************************************
 *			DRIVER_GetNumberOfModuleRefs		[internal]
 *
 * Returns the number of open drivers which share the same module.
 */
static	WORD	DRIVER_GetNumberOfModuleRefs(LPWINE_DRIVER lpNewDrv)
{
    LPWINE_DRIVER	lpDrv;
    WORD		count = 0;

    if (lpNewDrv->dwFlags & WINE_GDF_16BIT) ERR("OOOch");
    for (lpDrv = lpDrvItemList; lpDrv; lpDrv = lpDrv->lpNextItem) {
	if (!(lpDrv->dwFlags & WINE_GDF_16BIT) &&
	    lpDrv->d.d32.hModule == lpNewDrv->d.d32.hModule) {
	    count++;
	}
    }
    return count;
}

/**************************************************************************
 *				DRIVER_FindFromHDrvr		[internal]
 * 
 * From a hDrvr being 32 bits, returns the WINE internal structure.
 */
LPWINE_DRIVER	DRIVER_FindFromHDrvr(HDRVR hDrvr)
{    
    LPWINE_DRIVER	d = (LPWINE_DRIVER)hDrvr;

    if (hDrvr && HeapValidate(GetProcessHeap(), 0, d) && d->dwMagic == WINE_DI_MAGIC) {
	return d;
    }
    return NULL;
}

#ifndef __WIN32OS2__
/**************************************************************************
 *				DRIVER_MapMsg32To16		[internal]
 *
 * Map a 32 bit driver message to a 16 bit driver message.
 *  1 : ok, some memory allocated, need to call DRIVER_UnMapMsg32To16
 *  0 : ok, no memory allocated
 * -1 : ko, unknown message
 * -2 : ko, memory problem
 */
static int DRIVER_MapMsg32To16(WORD wMsg, DWORD* lParam1, DWORD* lParam2)
{
    int	ret = -1;
    
    switch (wMsg) {
    case DRV_LOAD:
    case DRV_ENABLE:
    case DRV_DISABLE:
    case DRV_FREE:
    case DRV_QUERYCONFIGURE:
    case DRV_REMOVE:
    case DRV_EXITSESSION:
    case DRV_EXITAPPLICATION:	
    case DRV_POWER:
    case DRV_CLOSE:	/* should be 0/0 */
    case DRV_OPEN:	/* pass thru */
	/* lParam1 and lParam2 are not used */
	ret = 0;
	break;
	break;
    case DRV_CONFIGURE:
    case DRV_INSTALL:
	/* lParam1 is a handle to a window (conf) or to a driver (inst) or not used, 
	 * lParam2 is a pointer to DRVCONFIGINFO 
	 */
	if (*lParam2) {
            LPDRVCONFIGINFO16	dci16 = (LPDRVCONFIGINFO16)SEGPTR_ALLOC(sizeof(DRVCONFIGINFO16));
            LPDRVCONFIGINFO	dci32 = (LPDRVCONFIGINFO)(*lParam2);
	    
	    if (dci16) {
		LPSTR	str1, str2;
		
		dci16->dwDCISize = sizeof(DRVCONFIGINFO16);
		
		if ((str1 = HEAP_strdupWtoA(GetProcessHeap(), 0, dci32->lpszDCISectionName)) != NULL &&
		    (str2 = SEGPTR_STRDUP(str1)) != NULL) {
		    dci16->lpszDCISectionName = SEGPTR_GET(str2);
		    if (!HeapFree(GetProcessHeap(), 0, str1))
			FIXME("bad free line=%d\n", __LINE__);
		} else {
		    return -2;
		}
		if ((str1 = HEAP_strdupWtoA(GetProcessHeap(), 0, dci32->lpszDCIAliasName)) != NULL &&
		    (str2 = SEGPTR_STRDUP(str1)) != NULL) {
		    dci16->lpszDCIAliasName = SEGPTR_GET(str2);
		    if (!HeapFree(GetProcessHeap(), 0, str1))
			FIXME("bad free line=%d\n", __LINE__);
		} else {
		    return -2;
		}
	    } else {
		return -2;
	    }
	    *lParam2 = (LPARAM)SEGPTR_GET(dci16);
	    ret = 1;
	} else {
	    ret = 0;
	}
	break;
    default:
	if (!((wMsg >= 0x800 && wMsg < 0x900) || (wMsg >= 0x4000 && wMsg < 0x4100))) {
	   FIXME("Unknown message 0x%04x\n", wMsg);
	}
	ret = 0;
    }
    return ret;
}

/**************************************************************************
 *				DRIVER_UnMapMsg32To16		[internal]
 *
 * UnMap a 32 bit driver message to a 16 bit driver message.
 *  0 : ok
 * -1 : ko
 * -2 : ko, memory problem
 */
static int DRIVER_UnMapMsg32To16(WORD wMsg, DWORD lParam1, DWORD lParam2)
{
    int	ret = -1;
    
    switch (wMsg) {
    case DRV_LOAD:
    case DRV_ENABLE:
    case DRV_DISABLE:
    case DRV_FREE:
    case DRV_QUERYCONFIGURE:
    case DRV_REMOVE:
    case DRV_EXITSESSION:
    case DRV_EXITAPPLICATION:
    case DRV_POWER:
    case DRV_OPEN:
    case DRV_CLOSE:
	/* lParam1 and lParam2 are not used */
	break;
    case DRV_CONFIGURE: 
    case DRV_INSTALL:
	/* lParam1 is a handle to a window (or not used), lParam2 is a pointer to DRVCONFIGINFO, lParam2 */
	if (lParam2) {
	    LPDRVCONFIGINFO16	dci16 = MapSL(lParam2);
	    
	    if (!SEGPTR_FREE(MapSL(dci16->lpszDCISectionName)))
		FIXME("bad free line=%d\n", __LINE__);
	    if (!SEGPTR_FREE(MapSL(dci16->lpszDCIAliasName)))
		FIXME("bad free line=%d\n", __LINE__);
	    if (!SEGPTR_FREE(dci16))
		FIXME("bad free line=%d\n", __LINE__);
	}
	ret = 0;
	break;
    default:
	if (!((wMsg >= 0x800 && wMsg < 0x900) || (wMsg >= 0x4000 && wMsg < 0x4100))) {
	    FIXME("Unknown message 0x%04x\n", wMsg);
	}
	ret = 0;
    }
    return ret;
}
#endif //#ifndef __WIN32OS2__

/**************************************************************************
 *				DRIVER_SendMessage		[internal]
 */
static LRESULT inline DRIVER_SendMessage(LPWINE_DRIVER lpDrv, UINT msg, 
					LPARAM lParam1, LPARAM lParam2)
{
#ifndef __WIN32OS2__
    if (lpDrv->dwFlags & WINE_GDF_16BIT) {
	LRESULT		ret;
	int		map = 0;
	TRACE("Before sdm16 call hDrv=%04x wMsg=%04x p1=%08lx p2=%08lx\n", 
	      lpDrv->d.d16.hDriver16, msg, lParam1, lParam2);

	if ((map = DRIVER_MapMsg32To16(msg, &lParam1, &lParam2)) >= 0) {
	    ret = SendDriverMessage16(lpDrv->d.d16.hDriver16, msg, lParam1, lParam2);
	    if (map == 1)
		DRIVER_UnMapMsg32To16(msg, lParam1, lParam2);
	} else {
	    ret = 0;
	}
	return ret;
    }
#endif
    TRACE("Before func32 call proc=%p driverID=%08lx hDrv=%08x wMsg=%04x p1=%08lx p2=%08lx\n", 
	  lpDrv->d.d32.lpDrvProc, lpDrv->d.d32.dwDriverID, (HDRVR)lpDrv, msg, lParam1, lParam2);
    return lpDrv->d.d32.lpDrvProc(lpDrv->d.d32.dwDriverID, (HDRVR)lpDrv, msg, lParam1, lParam2);
}

/**************************************************************************
 *				SendDriverMessage		[WINMM.19]
 */
LRESULT WINAPI SendDriverMessage(HDRVR hDriver, UINT msg, LPARAM lParam1,
				 LPARAM lParam2)
{
    LPWINE_DRIVER	lpDrv;
    LRESULT 		retval = 0;
    
    TRACE("(%04x, %04X, %08lX, %08lX)\n", hDriver, msg, lParam1, lParam2);
    
    if ((lpDrv = DRIVER_FindFromHDrvr(hDriver)) != NULL) {
	retval = DRIVER_SendMessage(lpDrv, msg, lParam1, lParam2);
    } else {
	WARN("Bad driver handle %u\n", hDriver);
    }
    TRACE("retval = %ld\n", retval);
    
    return retval;
}

/**************************************************************************
 *				DRIVER_RemoveFromList		[internal]
 *
 * Generates all the logic to handle driver closure / deletion
 * Removes a driver struct to the list of open drivers.
 */
static	BOOL	DRIVER_RemoveFromList(LPWINE_DRIVER lpDrv)
{
    if (!(lpDrv->dwFlags & WINE_GDF_16BIT)) {
	if (DRIVER_GetNumberOfModuleRefs(lpDrv) == 1) {
	    DRIVER_SendMessage(lpDrv, DRV_DISABLE, 0L, 0L);
	    DRIVER_SendMessage(lpDrv, DRV_FREE,    0L, 0L);
	}
    }
    
    if (lpDrv->lpPrevItem)
	lpDrv->lpPrevItem->lpNextItem = lpDrv->lpNextItem;
    else
	lpDrvItemList = lpDrv->lpNextItem;
    if (lpDrv->lpNextItem)
	lpDrv->lpNextItem->lpPrevItem = lpDrv->lpPrevItem;

    return TRUE;
}

/**************************************************************************
 *				DRIVER_AddToList		[internal]
 *
 * Adds a driver struct to the list of open drivers.
 * Generates all the logic to handle driver creation / open.
 */
static	BOOL	DRIVER_AddToList(LPWINE_DRIVER lpNewDrv, LPARAM lParam1, LPARAM lParam2)
{
    lpNewDrv->dwMagic = WINE_DI_MAGIC;
    /* First driver to be loaded for this module, need to load correctly the module */
    if (!(lpNewDrv->dwFlags & WINE_GDF_16BIT)) {
	if (DRIVER_GetNumberOfModuleRefs(lpNewDrv) == 0) {
	    if (DRIVER_SendMessage(lpNewDrv, DRV_LOAD, 0L, 0L) != DRV_SUCCESS) {
		TRACE("DRV_LOAD failed on driver 0x%08lx\n", (DWORD)lpNewDrv);
		return FALSE;
	    }
	    /* returned value is not checked */
	    DRIVER_SendMessage(lpNewDrv, DRV_ENABLE, 0L, 0L);
	}
    }

    lpNewDrv->lpNextItem = NULL;
    if (lpDrvItemList == NULL) {
	lpDrvItemList = lpNewDrv;
	lpNewDrv->lpPrevItem = NULL;
    } else {
	LPWINE_DRIVER	lpDrv = lpDrvItemList;	/* find end of list */
	while (lpDrv->lpNextItem != NULL)
	    lpDrv = lpDrv->lpNextItem;
	
	lpDrv->lpNextItem = lpNewDrv;
	lpNewDrv->lpPrevItem = lpDrv;
    }

    if (!(lpNewDrv->dwFlags & WINE_GDF_16BIT)) {
	/* Now just open a new instance of a driver on this module */
	lpNewDrv->d.d32.dwDriverID = DRIVER_SendMessage(lpNewDrv, DRV_OPEN, lParam1, lParam2);

	if (lpNewDrv->d.d32.dwDriverID == 0) {
	    TRACE("DRV_OPEN failed on driver 0x%08lx\n", (DWORD)lpNewDrv);
	    DRIVER_RemoveFromList(lpNewDrv);
	    return FALSE;
	}
    }
    return TRUE;
}

/**************************************************************************
 *				DRIVER_GetLibName		[internal]
 *
 */
BOOL	DRIVER_GetLibName(LPCSTR keyName, LPCSTR sectName, LPSTR buf, int sz)
{
    /* should also do some registry diving */
    return GetPrivateProfileStringA(sectName, keyName, "", buf, sz, "SYSTEM.INI");
}

/**************************************************************************
 *				DRIVER_TryOpenDriver32		[internal]
 *
 * Tries to load a 32 bit driver whose DLL's (module) name is fn
 */
LPWINE_DRIVER	DRIVER_TryOpenDriver32(LPCSTR fn, LPARAM lParam2)
{
    LPWINE_DRIVER 	lpDrv = NULL;
    HMODULE		hModule = 0;
    LPSTR		ptr;
    LPCSTR		cause = 0;

    TRACE("('%s', %08lX);\n", fn, lParam2);
    
    if ((ptr = strchr(fn, ' ')) != NULL) {
	*ptr++ = '\0';
	while (*ptr == ' ') ptr++;
	if (*ptr == '\0') ptr = NULL;
    }

    lpDrv = HeapAlloc(GetProcessHeap(), 0, sizeof(WINE_DRIVER));
    if (lpDrv == NULL) {cause = "OOM"; goto exit;}

    if ((hModule = LoadLibraryA(fn)) == 0) {cause = "Not a 32 bit lib"; goto exit;}

    lpDrv->d.d32.lpDrvProc = (DRIVERPROC)GetProcAddress(hModule, "DriverProc");
    if (lpDrv->d.d32.lpDrvProc == NULL) {cause = "no DriverProc"; goto exit;}

    lpDrv->dwFlags          = 0;
    lpDrv->d.d32.hModule    = hModule;
    lpDrv->d.d32.dwDriverID = 0;

    if (!DRIVER_AddToList(lpDrv, (LPARAM)ptr, lParam2)) {cause = "load faile"; goto exit;}

    TRACE("=> %p\n", lpDrv);
    return lpDrv;
 exit:
    FreeLibrary(hModule);
    HeapFree(GetProcessHeap(), 0, lpDrv);
    TRACE("Unable to load 32 bit module \"%s\": %s\n", fn, cause);
    return NULL;
}
#ifdef __WIN32OS2__
/**************************************************************************
 *				DRIVER_OpenDriverA		        [internal]
 * (0,1,DRV_LOAD  ,0       ,0)
 * (0,1,DRV_ENABLE,0       ,0)
 * (0,1,DRV_OPEN  ,buf[256],0)
 *
 */
static	LPWINE_DRIVER	DRIVER_TryOpenDriver16(LPCSTR lpDriverName, LPCSTR lpSectionName, LPARAM lParam)
{
  LPWINE_DRIVER lpDrv = NULL;
  char 		drvName[128];
  LPCSTR        cause = 0;
  
  TRACE("Entering DRIVER_OpenDriverA: lpDriverName: %s lpSectionName: %s\n",lpDriverName,lpSectionName);

  lpDrv = HeapAlloc(GetProcessHeap(), 0, sizeof(WINE_DRIVER));
  if (lpDrv == NULL) {cause = "OOM"; goto exit;}

  if (lpSectionName == NULL) {
	lstrcpynA(drvName, lpDriverName, sizeof(drvName));
	lpDrv = DRIVER_TryOpenDriver32(lpDriverName, lParam);
	if (!lpDrv) {
      if (GetPrivateProfileStringA("Drivers32", lpDriverName, "", drvName,
                                   sizeof(drvName), "SYSTEM.INI")) {

		lpDrv = DRIVER_TryOpenDriver32(drvName, lParam);		
      }
	}
  } else {/* of if (lpSectionName == NULL) */
    //dprintf(("driver name %x '%s'\n",drvName,drvName));
    drvName[0]=0;    

	if (GetPrivateProfileStringA(lpSectionName, lpDriverName, "", drvName,
                                 sizeof(drvName)-1, "SYSTEM.INI")) {
#if 0
      dprintf(("driver name %x '%s'\n",drvName,drvName));
#endif      
      lpDrv = DRIVER_TryOpenDriver32(drvName, lParam);
	}/* GetPrivate... */
  }
  if (!lpDrv)
	TRACE("OpenDriverA: Failed to open driver %s from section %s\n", lpDriverName, lpSectionName);

  else 
	TRACE("OpenDriverA success: Driver handle => %08x\n", lpDrv);

  return lpDrv;

 exit:
    HeapFree(GetProcessHeap(), 0, lpDrv);
    TRACE("Unable to load 32 bit module \"%s\": %s\n", lpDriverName, cause);
    return NULL;
}
#else
/**************************************************************************
 *				DRIVER_TryOpenDriver16		[internal]
 *
 * Tries to load a 16 bit driver whose DLL's (module) name is lpFileName.
 */
static	LPWINE_DRIVER	DRIVER_TryOpenDriver16(LPCSTR fn, LPCSTR sn, LPARAM lParam2)
{
    LPWINE_DRIVER 	lpDrv = NULL;
    LPCSTR		cause = 0;

    TRACE("('%s', %08lX);\n", sn, lParam2);
    
    lpDrv = HeapAlloc(GetProcessHeap(), 0, sizeof(WINE_DRIVER));
    if (lpDrv == NULL) {cause = "OOM"; goto exit;}

    /* FIXME: shall we do some black magic here on sn ?
     *	drivers32 => drivers
     *	mci32 => mci
     * ...
     */
    lpDrv->d.d16.hDriver16 = OpenDriver16(fn, sn, lParam2);
    if (lpDrv->d.d16.hDriver16 == 0) {cause = "Not a 16 bit driver"; goto exit;}
    lpDrv->dwFlags = WINE_GDF_16BIT;

    if (!DRIVER_AddToList(lpDrv, 0, lParam2)) {cause = "load faile"; goto exit;}

    TRACE("=> %p\n", lpDrv);
    return lpDrv;
 exit:
    HeapFree(GetProcessHeap(), 0, lpDrv);
    TRACE("Unable to load 32 bit module \"%s\": %s\n", fn, cause);
    return NULL;
}
#endif //#ifndef __WIN32OS2__

/**************************************************************************
 *				OpenDriverA		        [WINMM.15]
 * (0,1,DRV_LOAD  ,0       ,0)
 * (0,1,DRV_ENABLE,0       ,0)
 * (0,1,DRV_OPEN  ,buf[256],0)
 */
HDRVR WINAPI OpenDriverA(LPCSTR lpDriverName, LPCSTR lpSectionName, LPARAM lParam2) 
{
    LPWINE_DRIVER	lpDrv = NULL;
    char 		libName[128];
    LPCSTR		lsn = lpSectionName;

    TRACE("(%s, %s, 0x%08lx);\n", debugstr_a(lpDriverName), debugstr_a(lpSectionName), lParam2);
    
    if (lsn == NULL) {
	lstrcpynA(libName, lpDriverName, sizeof(libName));

	if ((lpDrv = DRIVER_TryOpenDriver32(libName, lParam2)))
	    goto the_end;
	lsn = "Drivers32";
    }
    if (DRIVER_GetLibName(lpDriverName, lsn, libName, sizeof(libName)) &&
	(lpDrv = DRIVER_TryOpenDriver32(libName, lParam2)))
	goto the_end;

    if (!(lpDrv = DRIVER_TryOpenDriver16(lpDriverName, lpSectionName, lParam2)))
	TRACE("Failed to open driver %s from system.ini file, section %s\n", lpDriverName, lpSectionName);

 the_end:
    if (lpDrv)	TRACE("=> %08lx\n", (DWORD)lpDrv);
    return (DWORD)lpDrv;
}

/**************************************************************************
 *				OpenDriverW		        [WINMM.15]
 */
HDRVR WINAPI OpenDriverW(LPCWSTR lpDriverName, LPCWSTR lpSectionName, LPARAM lParam)
{
    LPSTR 		dn = HEAP_strdupWtoA(GetProcessHeap(), 0, lpDriverName);
    LPSTR 		sn = HEAP_strdupWtoA(GetProcessHeap(), 0, lpSectionName);
    HDRVR		ret = OpenDriverA(dn, sn, lParam);
    
    if (dn) HeapFree(GetProcessHeap(), 0, dn);
    if (sn) HeapFree(GetProcessHeap(), 0, sn);
    return ret;
}

/**************************************************************************
 *			CloseDriver				[WINMM.4]
 */
LRESULT WINAPI CloseDriver(HDRVR hDrvr, LPARAM lParam1, LPARAM lParam2)
{
    LPWINE_DRIVER	lpDrv;

    TRACE("(%04x, %08lX, %08lX);\n", hDrvr, lParam1, lParam2);
    
    if ((lpDrv = DRIVER_FindFromHDrvr(hDrvr)) != NULL) {
#ifndef __WIN32OS2__
	if (lpDrv->dwFlags & WINE_GDF_16BIT)
	    CloseDriver16(lpDrv->d.d16.hDriver16, lParam1, lParam2);
	else
#endif
	    DRIVER_SendMessage(lpDrv, DRV_CLOSE, lParam1, lParam2);
	if (DRIVER_RemoveFromList(lpDrv)) {
	    HeapFree(GetProcessHeap(), 0, lpDrv);
	    return TRUE;
	}
    }
    WARN("Failed to close driver\n");
    return FALSE;
}

/**************************************************************************
 *				GetDriverFlags		[WINMM.13]
 * [in] hDrvr handle to the driver
 *
 * Returns:
 *	0x00000000 if hDrvr is an invalid handle
 *	0x80000000 if hDrvr is a valid 32 bit driver
 *	0x90000000 if hDrvr is a valid 16 bit driver
 *
 * native WINMM doesn't return those flags
 *	0x80000000 for a valid 32 bit driver and that's it
 *	(I may have mixed up the two flags :-(
 */
DWORD	WINAPI GetDriverFlags(HDRVR hDrvr)
{
    LPWINE_DRIVER 	lpDrv;
    DWORD		ret = 0;

    TRACE("(%04x)\n", hDrvr);

    if ((lpDrv = DRIVER_FindFromHDrvr(hDrvr)) != NULL) {
	ret = WINE_GDF_EXIST | lpDrv->dwFlags;
    }
    return ret;
}

/**************************************************************************
 *				GetDriverModuleHandle	[WINMM.14]
 */
HMODULE WINAPI GetDriverModuleHandle(HDRVR hDrvr)
{
    LPWINE_DRIVER 	lpDrv;
    HMODULE		hModule = 0;
    
    TRACE("(%04x);\n", hDrvr);
    
    if ((lpDrv = DRIVER_FindFromHDrvr(hDrvr)) != NULL) {
	if (!(lpDrv->dwFlags & WINE_GDF_16BIT))
	    hModule = lpDrv->d.d32.hModule;
    }
    TRACE("=> %04x\n", hModule);
    return hModule;
}

#ifndef __WIN32OS2__
/**************************************************************************
 * 				DrvOpen	       		[MMSYSTEM.1100]
 */
HDRVR16 WINAPI DrvOpen16(LPSTR lpDriverName, LPSTR lpSectionName, LPARAM lParam)
{
    return OpenDriver16(lpDriverName, lpSectionName, lParam);
}

/**************************************************************************
 * 				DrvClose       		[MMSYSTEM.1101]
 */
LRESULT WINAPI DrvClose16(HDRVR16 hDrv, LPARAM lParam1, LPARAM lParam2)
{
    return CloseDriver16(hDrv, lParam1, lParam2);
}

/**************************************************************************
 * 				DrvSendMessage		[MMSYSTEM.1102]
 */
LRESULT WINAPI DrvSendMessage16(HDRVR16 hDrv, WORD msg, LPARAM lParam1,
				LPARAM lParam2)
{
    return SendDriverMessage16(hDrv, msg, lParam1, lParam2);
}

/**************************************************************************
 * 				DrvGetModuleHandle	[MMSYSTEM.1103]
 */
HANDLE16 WINAPI DrvGetModuleHandle16(HDRVR16 hDrv)
{
    return GetDriverModuleHandle16(hDrv);
}

/**************************************************************************
 * 				DrvDefDriverProc	[MMSYSTEM.1104]
 */
LRESULT WINAPI DrvDefDriverProc16(DWORD dwDriverID, HDRVR16 hDrv, WORD wMsg, 
				  DWORD dwParam1, DWORD dwParam2)
{
    return DefDriverProc16(dwDriverID, hDrv, wMsg, dwParam1, dwParam2);
}
#endif //#ifndef __WIN32OS2__

/**************************************************************************
 * 				DefDriverProc			  [WINMM.5]
 */
LRESULT WINAPI DefDriverProc(DWORD dwDriverIdentifier, HDRVR hDrv,
			     UINT Msg, LPARAM lParam1, LPARAM lParam2)
{
    switch (Msg) {
    case DRV_LOAD:
    case DRV_FREE:
    case DRV_ENABLE:
    case DRV_DISABLE:
        return 1;
    case DRV_INSTALL:
    case DRV_REMOVE:
        return DRV_SUCCESS;
    default:
        return 0;
    }
}

#ifndef __WIN32OS2__
/**************************************************************************
 * 				DriverProc			[MMSYSTEM.6]
 */
LRESULT WINAPI DriverProc16(DWORD dwDevID, HDRVR16 hDrv, WORD wMsg, 
			    DWORD dwParam1, DWORD dwParam2)
{
    TRACE("dwDevID=%08lx hDrv=%04x wMsg=%04x dwParam1=%08lx dwParam2=%08lx\n",
	  dwDevID, hDrv, wMsg, dwParam1, dwParam2);

    return DrvDefDriverProc16(dwDevID, hDrv, wMsg, dwParam1, dwParam2);
}
#endif //#ifndef __WIN32OS2__

#ifdef __WIN32OS2__
/**************************************************************************
 * 				DriverCallback			[MMSYSTEM.31]
 */
BOOL WINAPI DriverCallback(DWORD dwCallBack, UINT uFlags, HDRVR hDev, 
			   UINT wMsg, DWORD dwUser, DWORD dwParam1, 
			   DWORD dwParam2)
{
    TRACE("DriverCallback (%08lX, %04X, %04X, %04X, %08lX, %08lX, %08lX); !\n",
	  dwCallBack, uFlags, hDev, wMsg, dwUser, dwParam1, dwParam2);

    switch (uFlags & DCB_TYPEMASK) {
    case DCB_NULL:
	TRACE("Null !\n");
	if (dwCallBack)
	    WARN("uFlags=%04X has null DCB value, but dwCallBack=%08lX is not null !\n", uFlags, dwCallBack);
	break;
    case DCB_WINDOW:
	TRACE("Window(%04lX) handle=%04X!\n", dwCallBack, hDev);
	if (!IsWindow(dwCallBack))
	    return FALSE;
	PostMessageA((HWND)dwCallBack, wMsg, hDev, dwParam1);
	break;
    case DCB_TASK: /* aka DCB_THREAD */
	TRACE("Task(%04lx) !\n", dwCallBack);
	PostThreadMessageA(dwCallBack, wMsg, hDev, dwParam1);
	break;
    case DCB_FUNCTION:
	TRACE("Function (32 bit) !\n");
	((LPDRVCALLBACK)dwCallBack)(hDev, wMsg, dwUser, dwParam1, dwParam2);
	break;
    case DCB_EVENT:
	TRACE("Event(%08lx) !\n", dwCallBack);
	SetEvent((HANDLE)dwCallBack);
	break;
    case 6: /* I would dub it DCB_MMTHREADSIGNAL */
	/* this is an undocumented DCB_ value used for mmThreads
	 * loword of dwCallBack contains the handle of the lpMMThd block
	 * which dwSignalCount has to be incremented
	 */
	{
#ifdef __WIN32OS2__
	    WINE_MMTHREAD*	lpMMThd = (WINE_MMTHREAD*)dwCallBack;
#else
	    WINE_MMTHREAD*	lpMMThd = MapSL( MAKESEGPTR(LOWORD(dwCallBack), 0) );
#endif

	    TRACE("mmThread (%04x, %p) !\n", LOWORD(dwCallBack), lpMMThd);
	    /* same as mmThreadSignal16 */
	    InterlockedIncrement(&lpMMThd->dwSignalCount);
	    SetEvent(lpMMThd->hEvent);
	    /* some other stuff on lpMMThd->hVxD */
	}
	break;	
#if 0
    case 4:
	/* this is an undocumented DCB_ value for... I don't know */
	break;
#endif
    default:
	WARN("Unknown callback type %d\n", uFlags & DCB_TYPEMASK);
	return FALSE;
    }
    TRACE("Done\n");
    return TRUE;
}
#endif