Warn on non-evdev devices

jni/nv_io/nv_io_jni.c

@@ -11,12 +11,13 @@ Java_com_limelight_input_IO_ioctl(
 
 	jboolean retval;
 	int fd;
+	int ret;
 	if ((fd = open(jni_filename, O_RDONLY)) < 0) {
 		retval = 0;
 	} else {
-		ioctl(fd, request, jni_buffer);
+		ret = ioctl(fd, request, jni_buffer);
 		close(fd);
-		retval = 1;
+		retval = ret > 0;
 	}
 
 	(*env)->ReleaseByteArrayElements(env, buffer, jni_buffer, 0);

src/com/limelight/input/EvdevAbsolute.java

@@ -12,8 +12,6 @@ public class EvdevAbsolute {
 	public final static int UP = 1, DOWN = -1, NONE = 0;
 	
 	private final static int ABS_OFFSET = 0x40;
-	private final static int READ_ONLY = 2;
-	private final static char EVDEV_TYPE = 'E';
 	
 	private int avg;
 	private int range;
@@ -25,7 +23,7 @@ public class EvdevAbsolute {
 		ByteBuffer buffer = ByteBuffer.allocate(6*4);
 		buffer.order(ByteOrder.nativeOrder());
 		byte[] data = buffer.array();
-		int request = getRequest(READ_ONLY, EVDEV_TYPE, ABS_OFFSET+axis, 6*4);
+		int request = IO.getRequest(IO.READ_ONLY, EvdevConstants.EVDEV_TYPE, ABS_OFFSET+axis, 6*4);
 		IO.ioctl(filename, data, request);
 		
 		buffer.getInt(); //Skip current value
@@ -39,10 +37,6 @@ public class EvdevAbsolute {
 		this.reverse = reverse;
 	}
 	
-	private int getRequest(int dir, int type, int nr, int size) {
-		return (dir << 30) | (size << 16) | (type << 8) | nr;
-	}
-	
 	/**
 	 * Convert input value to short range
 	 * @param value received input

src/com/limelight/input/EvdevConstants.java

@@ -183,4 +183,7 @@ public class EvdevConstants {
 	/* Events */
 	public static final int KEY_RELEASED = 0;
 	public static final int KEY_PRESSED = 1;
+	
+	/* ioctl */
+	public final static char EVDEV_TYPE = 'E';
 }

src/com/limelight/input/EvdevReader.java

@@ -11,6 +11,8 @@ import java.nio.channels.FileChannel;
 
 public abstract class EvdevReader implements Runnable {
 	
+	private final static int EVIOCGNAME = 0x06;
+	
 	private FileChannel deviceInput;
 	private ByteBuffer inputBuffer;
 
@@ -21,6 +23,13 @@ public abstract class EvdevReader implements Runnable {
 		if (!file.canRead())
 			throw new IOException("Can't read from " + device);
 		
+		byte[] data = new byte[255];
+		int request = IO.getRequest(IO.READ_ONLY, EvdevConstants.EVDEV_TYPE, EVIOCGNAME, data.length-1);
+		if (!IO.ioctl(device, data, request))
+			throw new IOException("Path " + device + " is not a evdev device");
+			
+		LimeLog.info("Using " + new String(data));
+			
 		FileInputStream in = new FileInputStream(file);
         deviceInput = in.getChannel();
 		inputBuffer = ByteBuffer.allocate(EvdevConstants.MAX_STRUCT_SIZE_BYTES);

src/com/limelight/input/IO.java

@@ -5,10 +5,17 @@ package com.limelight.input;
  * @author Iwan Timmer
  */
 public class IO {
+	
+	public final static int READ_ONLY = 2;
+	
 	static {
 		System.loadLibrary("nv_io");
 	}
 	
 	public static native boolean ioctl(String filename, byte[] buffer, int request);
 	
+	public static int getRequest(int dir, int type, int nr, int size) {
+		return (dir << 30) | (size << 16) | (type << 8) | nr;
+	}
+	
 }