/*
* $Id$
*
* Copyright (C) 2003-2014 JNode.org
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; If not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
package org.jnode.driver.ps2;
import java.nio.ByteBuffer;
import java.nio.channels.ByteChannel;
import java.nio.channels.ClosedChannelException;
import java.nio.channels.NonWritableChannelException;
import org.jnode.driver.Device;
import org.jnode.driver.DeviceException;
import org.jnode.driver.Driver;
import org.jnode.driver.DriverException;
import org.jnode.driver.character.ChannelAlreadyOwnedException;
import org.jnode.driver.character.CharacterDeviceAPI;
import org.jnode.util.ByteQueue;
/**
* @author qades
*/
abstract class PS2Driver extends Driver implements CharacterDeviceAPI, PS2Constants, ByteChannel {
private final ByteQueue queue = new ByteQueue();
private Device owner;
protected final PS2Bus ps2;
PS2Driver(PS2Bus ps2) {
this.ps2 = ps2;
}
/**
* @see org.jnode.system.IRQHandler#handleInterrupt(int)
*/
public void handleScancode(int b) {
queue.enQueue((byte) b);
}
/**
* Start the PS/2 device.
*/
protected synchronized void startDevice() throws DriverException {
init();
// Make sure it's at least a character device
getDevice().registerAPI(CharacterDeviceAPI.class, this);
}
/**
* Stop the PS/2 device.
*/
protected synchronized void stopDevice() throws DriverException {
getDevice().unregisterAPI(CharacterDeviceAPI.class);
deinit();
}
public synchronized ByteChannel getChannel(Device owner)
throws ChannelAlreadyOwnedException, DeviceException {
if (this.owner != null) {
throw new ChannelAlreadyOwnedException(this.owner);
} else {
this.owner = owner;
return this;
}
}
public int read(ByteBuffer dst) throws ClosedChannelException {
if (!isOpen()) {
throw new ClosedChannelException();
}
// FIXME: proper exception handling (if end of queue -> IOException)
int i;
for (i = 0; i < dst.remaining(); i++) {
dst.put(queue.deQueue());
}
return i;
}
public int write(ByteBuffer b) throws NonWritableChannelException {
throw new NonWritableChannelException();
}
public boolean isOpen() {
return (owner != null);
}
public synchronized void close() {
owner = null;
}
protected abstract void init() throws DriverException;
protected abstract void deinit();
abstract int getIRQ();
}