Index: sys/dev/iicbus/iic.c
===================================================================
--- sys/dev/iicbus/iic.c
+++ sys/dev/iicbus/iic.c
@@ -228,9 +228,9 @@
 			}
 				
 		} else if (uio->uio_rw == UIO_READ) {
-			error = iicbus_read(parent, buffer,
+			error = iic2errno(iicbus_read(parent, buffer,
 			    num_bytes, &transferred_bytes,
-			    ((uio->uio_resid <= sizeof(buffer)) ? last : 0), 0);
+			    ((uio->uio_resid <= sizeof(buffer)) ? last : 0), 0));
 			if (error == 0)
 				error = uiomove(buffer, transferred_bytes, uio);
 		}
@@ -261,8 +261,8 @@
 	}
 	parent = device_get_parent(priv->sc->sc_dev);
 
-	error = iicbus_request_bus(parent, priv->sc->sc_dev,
-	    (ioflag & O_NONBLOCK) ? IIC_DONTWAIT : (IIC_WAIT | IIC_INTR));
+	error = iic2errno(iicbus_request_bus(parent, priv->sc->sc_dev,
+	    (ioflag & O_NONBLOCK) ? IIC_DONTWAIT : (IIC_WAIT | IIC_INTR)));
 	if (error != 0) {
 		IIC_UNLOCK(priv);
 		return (error);
@@ -273,7 +273,7 @@
 	else
 		addr = priv->addr & ~LSB;
 
-	error = iicbus_start(parent, addr, 0);
+	error = iic2errno(iicbus_start(parent, addr, 0));
 	if (error != 0)
 	{
 		iicbus_release_bus(parent, priv->sc->sc_dev);
@@ -335,11 +335,11 @@
 	}
 
 	if (error == 0)
-		error = iicbus_request_bus(parent, iicdev,
-		    (flags & O_NONBLOCK) ? IIC_DONTWAIT : (IIC_WAIT | IIC_INTR));
+		error = iic2errno(iicbus_request_bus(parent, iicdev,
+		    (flags & O_NONBLOCK) ? IIC_DONTWAIT : (IIC_WAIT | IIC_INTR)));
 
 	if (error == 0) {
-		error = iicbus_transfer(iicdev, buf, d->nmsgs);
+		error = iic2errno(iicbus_transfer(iicdev, buf, d->nmsgs));
 		iicbus_release_bus(parent, iicdev);
 	}
 
@@ -384,11 +384,11 @@
 			error = EINVAL;
 			break;
 		}
-		error = iicbus_request_bus(parent, iicdev,
-		    (flags & O_NONBLOCK) ? IIC_DONTWAIT : (IIC_WAIT | IIC_INTR));
+		error = iic2errno(iicbus_request_bus(parent, iicdev,
+		    (flags & O_NONBLOCK) ? IIC_DONTWAIT : (IIC_WAIT | IIC_INTR)));
 
-		if (error == 0)
-			error = iicbus_start(parent, s->slave, 0);
+		if (error == 0) 
+			error = iic2errno(iicbus_start(parent, s->slave, 0));
 
 		if (error == 0) {
 			priv->addr = s->slave;
@@ -400,7 +400,7 @@
 
 	case I2CSTOP:
 		if (priv->started) {
-			error = iicbus_stop(parent);
+			error = iic2errno(iicbus_stop(parent));
 			iicbus_release_bus(parent, iicdev);
 			priv->started = false;
 		}
@@ -414,8 +414,8 @@
 		 * sequence; however, bus reset will always be followed by release
 		 * (a new start is presumably needed for I/O anyway). */ 
 		if (!priv->started)	
-			error = iicbus_request_bus(parent, iicdev,
-			    (flags & O_NONBLOCK) ? IIC_DONTWAIT : (IIC_WAIT | IIC_INTR));
+			error = iic2errno(iicbus_request_bus(parent, iicdev,
+			    (flags & O_NONBLOCK) ? IIC_DONTWAIT : (IIC_WAIT | IIC_INTR)));
 
 		if (error == 0) {
 			error = iicbus_reset(parent, IIC_UNKNOWN, 0, NULL);
@@ -484,7 +484,7 @@
 			error = EINVAL;
 			break;
 		}
-		error = iicbus_repeated_start(parent, s->slave, 0);
+		error = iic2errno(iicbus_repeated_start(parent, s->slave, 0));
 		break;
 
 	case I2CSADDR: