IOFWUserIsochChannel.cpp   [plain text]

/*
 * Copyright (c) 1998-2001 Apple Computer, Inc. All rights reserved.
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 * Version 2.0 (the 'License'). You may not use this file except in
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/*
 *  IOFWUserIsochChannel.cpp
 *  IOFireWireFamily
 *
 *  Created by noggin on Tue May 15 2001.
 *  Copyright (c) 2001 Apple Computer, Inc. All rights reserved.
 *
 */

#import <IOKit/firewire/IOFireWireController.h>
#import <IOKit/firewire/IOFWCommand.h>
#import <IOKit/firewire/IOFWIsochPort.h>

#import "IOFireWireUserClient.h"
#import "IOFWUserIsochChannel.h"

OSDefineMetaClassAndStructors(IOFWUserIsochChannel, IOFWIsochChannel)

IOReturn
IOFWUserIsochChannel::allocateChannel()
{
	// maybe we should call user space lib here?
//	IOLog("IOFWUserIsochChannel::allocateChannel called!\n") ;
	return kIOReturnUnsupported ;
}

IOReturn
IOFWUserIsochChannel::releaseChannel()
{
	// maybe we should call user space lib here?
//	IOLog("IOFWUserIsochChannel::releaseChannel called!\n") ;
	return kIOReturnUnsupported ;
}


IOReturn
IOFWUserIsochChannel::start()
{
	// maybe we should call user space lib here?
//	IOLog("IOFWUserIsochChannel::start called!\n") ;
	return kIOReturnUnsupported ;
}

IOReturn
IOFWUserIsochChannel::stop()
{
	// maybe we should call user space lib here?
//	IOLog("IOFWUserIsochChannel::stop called!\n") ;
	return kIOReturnUnsupported ;
}


// Note: userAllocateChannelBegin is equivalent to IOFWUserIsochChannel::allocateChannel()
// minus the bits that actually call IOFWIsochPort::allocatePort(). This is because we must
// call that function from user space to avoid deadlocking the user process. Perhaps
// the superclass IOFWIsochChannel should contain this function to avoid the potential
// for out-of-sync code.

IOReturn
IOFWUserIsochChannel::userAllocateChannelBegin(
	IOFWSpeed		speed,
	UInt32			allowedChansHi,
	UInt32			allowedChansLo,
	IOFWSpeed*		outActualSpeed,
	UInt32*			outActualChannel)
{
	IOReturn 	err = kIOReturnSuccess;

	if (!fBandwidthAllocated)
	{
		err = allocateChannelBegin( speed, (UInt64)allowedChansHi<<32 | allowedChansLo, fChannel ) ;
	}
	
	if ( !err )
	{
//		DebugLog("IOFWUserIsochChannel :: userAllocateChannelBegin: result=0x%08x, fSpeed=%u, fChannel=0x%08lX\n", err, fSpeed, fChannel) ;

		// set channel's speed
		fSpeed = speed ;

		fBandwidthAllocated = true ;

		// return results to user space
		*outActualSpeed 	= fSpeed ;
		*outActualChannel	= fChannel ;
	}

    if( err ) {
        releaseChannel();
    }
	
    return err ;
}

IOReturn
IOFWUserIsochChannel :: userReleaseChannelComplete ()
{
	// allocate hardware resources for each port
	// ** note: this bit of the code moved to user space. this allows us to directly call
	// user space ports to avoid potential deadlock in user apps.

    // release bandwidth and channel

	if ( !fBandwidthAllocated )
		return kIOReturnSuccess ;

	fBandwidthAllocated = false ;	
		
    return releaseChannelComplete() ;
}

IOReturn
IOFWUserIsochChannel::allocateListenerPorts()
{
	IOFWIsochPort*		listen;
	IOReturn			result 			= kIOReturnSuccess ;
	OSIterator*			listenIterator	= OSCollectionIterator::withCollection(fListeners) ;

	if(listenIterator) {
		listenIterator->reset();
		while( (listen = (IOFWIsochPort *) listenIterator->getNextObject()) && (result == kIOReturnSuccess)) {
			result = listen->allocatePort(fSpeed, fChannel);
		}
		listenIterator->release();
	}
	
	return result ;
}

IOReturn
IOFWUserIsochChannel::allocateTalkerPort()
{
	IOReturn	result	= kIOReturnSuccess ;

	if(fTalker)
		result = fTalker->allocatePort(fSpeed, fChannel);
	
	return result ;
}

void
IOFWUserIsochChannel :: s_exporterCleanup ( IOFWUserIsochChannel * channel )
{
	DebugLog( "+IOFWUserIsochChannel :: s_exporterCleanup channel=%p\n", channel) ;
	
	channel->fControl->removeAllocatedChannel( channel ) ;

	channel->stop() ;
	channel->releaseChannel() ;
}