usbfx2lk_createclose.cpp

基于vc++6.0环境的cypress USB 驱动源代码

///////////////////////////////////////////////////////////////////////////////
//
//    (C) Copyright 2005 OSR Open Systems Resources, Inc.
//    All Rights Reserved
//
//    This sofware is supplied for instructional purposes only.
//
//    OSR Open Systems Resources, Inc. (OSR) expressly disclaims any warranty
//    for this software.  THIS SOFTWARE IS PROVIDED  "AS IS" WITHOUT WARRANTY
//    OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING, WITHOUT LIMITATION,
//    THE IMPLIED WARRANTIES OF MECHANTABILITY OR FITNESS FOR A PARTICULAR
//    PURPOSE.  THE ENTIRE RISK ARISING FROM THE USE OF THIS SOFTWARE REMAINS
//    WITH YOU.  OSR's entire liability and your exclusive remedy shall not
//    exceed the price paid for this material.  In no event shall OSR or its
//    suppliers be liable for any damages whatsoever (including, without
//    limitation, damages for loss of business profit, business interruption,
//    loss of business information, or any other pecuniary loss) arising out
//    of the use or inability to use this software, even if OSR has been
//    advised of the possibility of such damages.  Because some states/
//    jurisdictions do not allow the exclusion or limitation of liability for
//    consequential or incidental damages, the above limitation may not apply
//    to you.
//
//    OSR Open Systems Resources, Inc.
//    105 Route 101A Suite 19
//    Amherst, NH 03031  [phone] FAX: [phone]
//    email bugs to: [e-mail]
//
//
//    MODULE:
//
//      USBFx2LK_CreateClose.cpp
//
//    ABSTRACT:
//
//      This file contains the routines that handle IRP_MJ_CREATE and
//      IRP_MJ_CLOSE processing for the OSR USB FX2 Learning Kit Device
//
//    AUTHOR(S):
//
//      OSR Open Systems Resources, Inc.
// 
///////////////////////////////////////////////////////////////////////////////
#include "usbfx2lk.h"

#ifdef WPP_TRACING
//
// Include the necessary tmh file - this is 
//  just a matter of course if you're using WPP tracing.
//
extern "C" {
#include "usbfx2lk_createclose.tmh"
}
#endif


///////////////////////////////////////////////////////////////////////////////
//
// UsbFx2LkCreate
//
//  This routine is called by the IO Manager to process a IRP_MJ_CREATE
//  Irp.
//
//
//  INPUTS:
//
//      DeviceObject  -  One of our Device Objects.
//      Irp  -  The Irp to process.
//
//  OUTPUTS:
//
//      None
//
//  RETURNS:
//
//      None
//
//  IRQL:
//
//      IRQL == PASSIVE_LEVEL
//
//  CONTEXT:
//
//      User Context
//
//  NOTES:
//
///////////////////////////////////////////////////////////////////////////////
NTSTATUS UsbFx2LkCreate(PDEVICE_OBJECT DeviceObject,PIRP Irp)
{
    PUSBFX2LK_EXT       devExt = (PUSBFX2LK_EXT)DeviceObject->DeviceExtension;
    NTSTATUS            status = STATUS_SUCCESS;
    KIRQL               oldIrql;
   
    //
    // We treat this routine as pageable
    //
    PAGED_CODE();

    //
    // Increment the count of outstanding IOs.
    //
    OsrIncrementOutstandingIoCount(devExt,__FILE__,__LINE__);

    //
    // Are we not in a state that allows a 
    //  CREATE to occur?
    //
    KeAcquireSpinLock(&devExt->IoStateLock,&oldIrql);
    if (devExt->DevicePnPState < STATE_ALL_BELOW_FAIL) {

        KeReleaseSpinLock(&devExt->IoStateLock,oldIrql);

        status = STATUS_INVALID_DEVICE_STATE;

        OsrTracePrint(TRACE_LEVEL_ERROR,OSRDBG_CREATE_CLOSE_INFO, 
            ("OsrCreateClose: Attempt to open handle denied due to Pnp State! Current PnP state - %s\n",
            OsrPrintState(devExt)));


        //
        // Complete the request!
        //
        Irp->IoStatus.Status      = status;
        Irp->IoStatus.Information = 0;

        IoCompleteRequest(Irp, IO_NO_INCREMENT);

        //
        // We're done with this request. Decrement the count
        // of outstanding IOs
        //
        OsrDecrementOutstandingIoCount(devExt,__FILE__,__LINE__);

        return status;

    }

    //
    // See if the device is already opened.  If it is, don't allow another open.   We do this so
    // that we can have multiple test boards and test programs running simultaneously on different
    // devices and they don't interfer with each other.
    //
    if(devExt->Opened) {
        status = STATUS_ACCESS_DENIED;
        OsrTracePrint(TRACE_LEVEL_ERROR,OSRDBG_CREATE_CLOSE_INFO,("OsrCreateClose: Device Already Opened.\n"));
    } else {
        devExt->Opened = TRUE;
    }

    KeReleaseSpinLock(&devExt->IoStateLock,oldIrql);

    //
    // Complete the request!
    //
    Irp->IoStatus.Status      = status;
    Irp->IoStatus.Information = 0;
    
    IoCompleteRequest(Irp, IO_NO_INCREMENT);
    
    //
    // We're done with this request. Decrement the count
    // of outstanding IOs
    //
    OsrDecrementOutstandingIoCount(devExt,__FILE__,__LINE__);

    return status;
}

///////////////////////////////////////////////////////////////////////////////
//
// UsbFx2LkClose
//
//  This routine is called by the IO Manager to process a IRP_MJ_CLOSE
//  Irp.
//
//
//  INPUTS:
//
//      DeviceObject  -  One of our Device Objects.
//      Irp  -  The Irp to process.
//
//  OUTPUTS:
//
//      None
//
//  RETURNS:
//
//      None
//
//  IRQL:
//
//      IRQL == PASSIVE_LEVEL
//
//  CONTEXT:
//
//      User Context
//
//  NOTES:
//
///////////////////////////////////////////////////////////////////////////////
NTSTATUS UsbFx2LkClose(PDEVICE_OBJECT DeviceObject,PIRP Irp)
{
    PUSBFX2LK_EXT   devExt = (PUSBFX2LK_EXT)DeviceObject->DeviceExtension;
    KIRQL           oldIrql;

    //
    // We treat this routine as pageable
    //
    PAGED_CODE();

    //
    // Increment the count of outstanding IOs.
    //
    OsrIncrementOutstandingIoCount(devExt,__FILE__,__LINE__);

    //
    // Clear the Opened Flag.   This allows someone else to open
    // the device, since we are through with it.
    //
    KeAcquireSpinLock(&devExt->IoStateLock,&oldIrql);
    devExt->Opened = FALSE;
    KeReleaseSpinLock(&devExt->IoStateLock,oldIrql);

    //
    // Finish the request
    //
    Irp->IoStatus.Status = STATUS_SUCCESS;
    Irp->IoStatus.Information = 0;
    IoCompleteRequest(Irp,IO_NO_INCREMENT);

    //
    // We're done with this request
    //
    OsrDecrementOutstandingIoCount(devExt,__FILE__,__LINE__);

    return STATUS_SUCCESS;

}