pmicoalioctl.c

来自「i.mx27 soc for wince 6.0」· C语言 代码 · 共 76 行

//------------------------------------------------------------------------------
//
//  Copyright (C) 2006, Freescale Semiconductor, Inc. All Rights Reserved.
//  THIS SOURCE CODE, AND ITS USE AND DISTRIBUTION, IS SUBJECT TO THE TERMS
//  AND CONDITIONS OF THE APPLICABLE LICENSE AGREEMENT
//
//------------------------------------------------------------------------------

#include <windows.h>
#include <oal_log.h>

#include "ioctl_pmic.h"

extern CRITICAL_SECTION g_oalPmicMutex;

//-----------------------------------------------------------------------------
//
//  Function: OALPmicIoctlCspiLock
//
//  Obtains a lock for the CSPI hardware so that the OAL and PMIC core driver
//  can safely share access.
//
//  Parameters:
//      code       - unused
//      pInpBuffer - unused
//      inpSize    - unused
//      pOutBuffer - unused
//      outSize    - unused
//      pOutSize   - unused
//
//  Returns:
//      TRUE - successfully acquired CSPI lock
//
//-----------------------------------------------------------------------------

BOOL OALPmicIoctlCspiLock(
    UINT32 code, VOID *pInpBuffer, UINT32 inpSize, VOID *pOutBuffer,
    UINT32 outSize, UINT32 *pOutSize)
{
    // Ensure that the PMIC driver has exclusive access to the CSPI bus
    // until the current CSPI transaction has been completed.
    EnterCriticalSection(&g_oalPmicMutex);

    return TRUE;
}

//-----------------------------------------------------------------------------
//
//  Function: OALPmicIoctlCspiUnlock
//
//  Release the lock previously obtained by OALPmicIoctlCspiLock.
//
//  Parameters:
//      code       - unused
//      pInpBuffer - unused
//      inpSize    - unused
//      pOutBuffer - unused
//      outSize    - unused
//      pOutSize   - unused
//
//  Returns:
//      TRUE - successfully released CSPI lock
//
//-----------------------------------------------------------------------------

BOOL OALPmicIoctlCspiUnlock(
    UINT32 code, VOID *pInpBuffer, UINT32 inpSize, VOID *pOutBuffer,
    UINT32 outSize, UINT32 *pOutSize)
{
    // The current CSPI transaction has been completed. Other PMIC device
    // drivers or the OAL may now access the CSPI bus.
    LeaveCriticalSection(&g_oalPmicMutex);

    return TRUE;
}