source: vbox/trunk/src/VBox/Main/ParallelPortImpl.cpp@ 6595

/* $Id: ParallelPortImpl.cpp 6168 2007-12-21 14:38:19Z vboxsync $ */
/** @file
 * VirtualBox COM class implementation
 */

/*
 * Copyright (C) 2006-2007 innotek GmbH
 *
 * This file is part of VirtualBox Open Source Edition (OSE), as
 * available from http://www.virtualbox.org. This file is free software;
 * you can redistribute it and/or modify it under the terms of the GNU
 * General Public License (GPL) as published by the Free Software
 * Foundation, in version 2 as it comes in the "COPYING" file of the
 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
 */

#include "ParallelPortImpl.h"
#include "MachineImpl.h"
#include "VirtualBoxImpl.h"
#include "Logging.h"

#include <iprt/string.h>
#include <iprt/cpputils.h>

// constructor / destructor
/////////////////////////////////////////////////////////////////////////////

DEFINE_EMPTY_CTOR_DTOR (ParallelPort)

HRESULT ParallelPort::FinalConstruct()
{
    return S_OK;
}

void ParallelPort::FinalRelease()
{
    uninit();
}

// public initializer/uninitializer for internal purposes only
/////////////////////////////////////////////////////////////////////////////

/**
 *  Initializes the Parallel Port object.
 *
 *  @param aParent  Handle of the parent object.
 */
HRESULT ParallelPort::init (Machine *aParent, ULONG aSlot)
{
    LogFlowThisFunc (("aParent=%p, aSlot=%d\n", aParent, aSlot));

    ComAssertRet (aParent, E_INVALIDARG);

    /* Enclose the state transition NotReady->InInit->Ready */
    AutoInitSpan autoInitSpan (this);
    AssertReturn (autoInitSpan.isOk(), E_UNEXPECTED);

    unconst (mParent) = aParent;
    /* mPeer is left null */

    mData.allocate();

    /* initialize data */
    mData->mSlot = aSlot;

    /* Confirm a successful initialization */
    autoInitSpan.setSucceeded();

    return S_OK;
}

/**
 *  Initializes the Parallel Port object given another serial port object
 *  (a kind of copy constructor). This object shares data with
 *  the object passed as an argument.
 *
 *  @note This object must be destroyed before the original object
 *  it shares data with is destroyed.
 *
 *  @note Locks @a aThat object for reading.
 */
HRESULT ParallelPort::init (Machine *aParent, ParallelPort *aThat)
{
    LogFlowThisFunc (("aParent=%p, aThat=%p\n", aParent, aThat));

    ComAssertRet (aParent && aThat, E_INVALIDARG);

    /* Enclose the state transition NotReady->InInit->Ready */
    AutoInitSpan autoInitSpan (this);
    AssertReturn (autoInitSpan.isOk(), E_UNEXPECTED);

    unconst (mParent) = aParent;
    unconst (mPeer) = aThat;

    AutoCaller thatCaller (aThat);
    AssertComRCReturnRC (thatCaller.rc());

    AutoReaderLock thatLock (aThat);
    mData.share (aThat->mData);

    /* Confirm a successful initialization */
    autoInitSpan.setSucceeded();

    return S_OK;
}

/**
 *  Initializes the guest object given another guest object
 *  (a kind of copy constructor). This object makes a private copy of data
 *  of the original object passed as an argument.
 *
 *  @note Locks @a aThat object for reading.
 */
HRESULT ParallelPort::initCopy (Machine *aParent, ParallelPort *aThat)
{
    LogFlowThisFunc (("aParent=%p, aThat=%p\n", aParent, aThat));

    ComAssertRet (aParent && aThat, E_INVALIDARG);

    /* Enclose the state transition NotReady->InInit->Ready */
    AutoInitSpan autoInitSpan (this);
    AssertReturn (autoInitSpan.isOk(), E_UNEXPECTED);

    unconst (mParent) = aParent;
    /* mPeer is left null */

    AutoCaller thatCaller (aThat);
    AssertComRCReturnRC (thatCaller.rc());

    AutoReaderLock thatLock (aThat);
    mData.attachCopy (aThat->mData);

    /* Confirm a successful initialization */
    autoInitSpan.setSucceeded();

    return S_OK;
}

/**
 *  Uninitializes the instance and sets the ready flag to FALSE.
 *  Called either from FinalRelease() or by the parent when it gets destroyed.
 */
void ParallelPort::uninit()
{
    LogFlowThisFunc (("\n"));

    /* Enclose the state transition Ready->InUninit->NotReady */
    AutoUninitSpan autoUninitSpan (this);
    if (autoUninitSpan.uninitDone())
        return;

    mData.free();

    unconst (mPeer).setNull();
    unconst (mParent).setNull();
}

// public methods only for internal purposes
////////////////////////////////////////////////////////////////////////////////

/**
 *  Loads settings from the given port node.
 *  May be called once right after this object creation.
 * 
 *  @param aPortNode <Port> node.
 * 
 *  @note Locks this object for writing.
 */
HRESULT ParallelPort::loadSettings (const settings::Key &aPortNode)
{
    using namespace settings;

    AssertReturn (!aPortNode.isNull(), E_FAIL);

    AutoCaller autoCaller (this);
    AssertComRCReturnRC (autoCaller.rc());

    AutoLock alock (this);

    /* Note: we assume that the default values for attributes of optional
     * nodes are assigned in the Data::Data() constructor and don't do it
     * here. It implies that this method may only be called after constructing
     * a new BIOSSettings object while all its data fields are in the default
     * values. Exceptions are fields whose creation time defaults don't match
     * values that should be applied when these fields are not explicitly set
     * in the settings file (for backwards compatibility reasons). This takes
     * place when a setting of a newly created object must default to A while
     * the same setting of an object loaded from the old settings file must
     * default to B. */ 

    /* enabled (required) */
    mData->mEnabled = aPortNode.value <bool> ("enabled");
    /* I/O base (required) */
    mData->mIOBase = aPortNode.value <ULONG> ("IOBase");
    /* IRQ (required) */
    mData->mIRQ = aPortNode.value <ULONG> ("IRQ");
    /* device path (optional, defaults to null) */
    Bstr path = aPortNode.stringValue ("path");

    HRESULT rc = checkSetPath (path);
    CheckComRCReturnRC (rc);
    mData->mPath = path;

    return S_OK;
}

/** 
 *  Saves settings to the given port node.
 * 
 *  Note that the given Port node is comletely empty on input.
 *
 *  @param aPortNode <Port> node.
 * 
 *  @note Locks this object for reading. 
 */
HRESULT ParallelPort::saveSettings (settings::Key &aPortNode)
{
    using namespace settings;

    AssertReturn (!aPortNode.isNull(), E_FAIL);

    AutoCaller autoCaller (this);
    AssertComRCReturnRC (autoCaller.rc());

    AutoReaderLock alock (this);

    aPortNode.setValue <bool> ("enabled", !!mData->mEnabled);
    aPortNode.setValue <ULONG> ("IOBase", mData->mIOBase, 16);
    aPortNode.setValue <ULONG> ("IRQ", mData->mIRQ);

    /* 'path' is optional in XML */
    if (!mData->mPath.isEmpty())
        aPortNode.setValue <Bstr> ("path", mData->mPath);

    return S_OK;
}

/**
 *  @note Locks this object for writing.
 */
bool ParallelPort::rollback()
{
    /* sanity */
    AutoCaller autoCaller (this);
    AssertComRCReturn (autoCaller.rc(), false);

    AutoLock alock (this);

    bool changed = false;

    if (mData.isBackedUp())
    {
        /* we need to check all data to see whether anything will be changed
         * after rollback */
        changed = mData.hasActualChanges();
        mData.rollback();
    }

    return changed;
}

/**
 *  @note Locks this object for writing, together with the peer object (also
 *  for writing) if there is one.
 */
void ParallelPort::commit()
{
    /* sanity */
    AutoCaller autoCaller (this);
    AssertComRCReturnVoid (autoCaller.rc());

    /* sanity too */
    AutoCaller thatCaller (mPeer);
    AssertComRCReturnVoid (thatCaller.rc());

    /* lock both for writing since we modify both */
    AutoMultiLock <2> alock (this->wlock(), AutoLock::maybeWlock (mPeer));

    if (mData.isBackedUp())
    {
        mData.commit();
        if (mPeer)
        {
            /* attach new data to the peer and reshare it */
            mPeer->mData.attach (mData);
        }
    }
}

/**
 *  @note Locks this object for writing, together with the peer object
 *  represented by @a aThat (locked for reading).
 */
void ParallelPort::copyFrom (ParallelPort *aThat)
{
    AssertReturnVoid (aThat != NULL);

    /* sanity */
    AutoCaller autoCaller (this);
    AssertComRCReturnVoid (autoCaller.rc());

    /* sanity too */
    AutoCaller thatCaller (mPeer);
    AssertComRCReturnVoid (thatCaller.rc());

    /* peer is not modified, lock it for reading */
    AutoMultiLock <2> alock (this->wlock(), aThat->rlock());

    /* this will back up current data */
    mData.assignCopy (aThat->mData);
}

// IParallelPort properties
/////////////////////////////////////////////////////////////////////////////

STDMETHODIMP ParallelPort::COMGETTER(Enabled) (BOOL *aEnabled)
{
    if (!aEnabled)
        return E_POINTER;

    AutoCaller autoCaller (this);
    CheckComRCReturnRC (autoCaller.rc());

    AutoReaderLock alock (this);

    *aEnabled = mData->mEnabled;

    return S_OK;
}

STDMETHODIMP ParallelPort::COMSETTER(Enabled) (BOOL aEnabled)
{
    LogFlowThisFunc (("aEnabled=%RTbool\n", aEnabled));

    AutoCaller autoCaller (this);
    CheckComRCReturnRC (autoCaller.rc());

    /* the machine needs to be mutable */
    Machine::AutoMutableStateDependency adep (mParent);
    CheckComRCReturnRC (adep.rc());

    AutoLock alock (this);

    if (mData->mEnabled != aEnabled)
    {
        if (aEnabled &&
            mData->mPath.isEmpty())
            return setError (E_INVALIDARG,
                        tr ("Cannot enable the parallel port %d "
                            "because the port path is empty or null"),
                        mData->mSlot);

        mData.backup();
        mData->mEnabled = aEnabled;

        /* leave the lock before informing callbacks */
        alock.unlock();

        mParent->onParallelPortChange (this);
    }

    return S_OK;
}

STDMETHODIMP ParallelPort::COMGETTER(Slot) (ULONG *aSlot)
{
    if (!aSlot)
        return E_POINTER;

    AutoCaller autoCaller (this);
    CheckComRCReturnRC (autoCaller.rc());

    AutoReaderLock alock (this);

    *aSlot = mData->mSlot;

    return S_OK;
}

STDMETHODIMP ParallelPort::COMGETTER(IRQ) (ULONG *aIRQ)
{
    if (!aIRQ)
        return E_POINTER;

    AutoCaller autoCaller (this);
    CheckComRCReturnRC (autoCaller.rc());

    AutoReaderLock alock (this);

    *aIRQ = mData->mIRQ;

    return S_OK;
}

STDMETHODIMP ParallelPort::COMSETTER(IRQ)(ULONG aIRQ)
{
    /* check IRQ limits
     * (when changing this, make sure it corresponds to XML schema */
    if (aIRQ > 255)
        return setError (E_INVALIDARG,
            tr ("Invalid IRQ number of the parallel port %d: "
                "%lu (must be in range [0, %lu])"),
            mData->mSlot, aIRQ, 255);

    AutoCaller autoCaller (this);
    CheckComRCReturnRC (autoCaller.rc());

    /* the machine needs to be mutable */
    Machine::AutoMutableStateDependency adep (mParent);
    CheckComRCReturnRC (adep.rc());

    AutoLock alock (this);

    HRESULT rc = S_OK;
    bool emitChangeEvent = false;

    if (mData->mIRQ != aIRQ)
    {
        mData.backup();
        mData->mIRQ = aIRQ;
        emitChangeEvent = true;
    }

    if (emitChangeEvent)
    {
        /* leave the lock before informing callbacks */
        alock.unlock();

        mParent->onParallelPortChange (this);
    }

    return rc;
}

STDMETHODIMP ParallelPort::COMGETTER(IOBase) (ULONG *aIOBase)
{
    if (!aIOBase)
        return E_POINTER;

    AutoCaller autoCaller (this);
    CheckComRCReturnRC (autoCaller.rc());

    AutoReaderLock alock (this);

    *aIOBase = mData->mIOBase;

    return S_OK;
}

STDMETHODIMP ParallelPort::COMSETTER(IOBase)(ULONG aIOBase)
{
    /* check IOBase limits
     * (when changing this, make sure it corresponds to XML schema */
    if (aIOBase > 0xFFFF)
        return setError (E_INVALIDARG,
            tr ("Invalid I/O port base address of the parallel port %d: "
                "%lu (must be in range [0, 0x%X])"),
            mData->mSlot, aIOBase, 0, 0xFFFF);

    AutoCaller autoCaller (this);
    CheckComRCReturnRC (autoCaller.rc());

    /* the machine needs to be mutable */
    Machine::AutoMutableStateDependency adep (mParent);
    CheckComRCReturnRC (adep.rc());

    AutoLock alock (this);

    HRESULT rc = S_OK;
    bool emitChangeEvent = false;

    if (mData->mIOBase != aIOBase)
    {
        mData.backup();
        mData->mIOBase = aIOBase;
        emitChangeEvent = true;
    }

    if (emitChangeEvent)
    {
        /* leave the lock before informing callbacks */
        alock.unlock();

        mParent->onParallelPortChange (this);
    }

    return rc;
}

STDMETHODIMP ParallelPort::COMGETTER(Path) (BSTR *aPath)
{
    if (!aPath)
        return E_POINTER;

    AutoCaller autoCaller (this);
    CheckComRCReturnRC (autoCaller.rc());

    AutoReaderLock alock (this);

    mData->mPath.cloneTo (aPath);

    return S_OK;
}

/** 
 *  Validates COMSETTER(Path) arguments.
 */
HRESULT ParallelPort::checkSetPath (const BSTR aPath)
{
    AssertReturn (isLockedOnCurrentThread(), E_FAIL);

    if (mData->mEnabled &&
        (aPath == NULL || *aPath == '\0'))
        return setError (E_INVALIDARG,
            tr ("Path of the parallel port %d may not be empty or null "
                "when the port is enabled"),
            mData->mSlot);

    return S_OK;
}

STDMETHODIMP ParallelPort::COMSETTER(Path) (INPTR BSTR aPath)
{
    AutoCaller autoCaller (this);
    CheckComRCReturnRC (autoCaller.rc());

    /* the machine needs to be mutable */
    Machine::AutoMutableStateDependency adep (mParent);
    CheckComRCReturnRC (adep.rc());

    AutoLock alock (this);

    if (mData->mPath != aPath)
    {
        HRESULT rc = checkSetPath (aPath);
        CheckComRCReturnRC (rc);

        mData.backup();
        mData->mPath = aPath;

        /* leave the lock before informing callbacks */
        alock.unlock();

        return mParent->onParallelPortChange (this);
    }

    return S_OK;
}