diff --git a/hanvon-libusb.c b/hanvon-libusb.c
index 429956b..8bab1b2 100644
--- a/hanvon-libusb.c
+++ b/hanvon-libusb.c
@@ -21,6 +21,7 @@
 
 #include <libevdev/libevdev.h>
 #include <libevdev/libevdev-uinput.h>
+
 // #include <asm/unaligned.h>
 
 #define STATE_SUCCESS 0
@@ -120,16 +121,25 @@ void callback(struct libusb_transfer *transfer) {
     display_packets(data);
 }
 
-void callback_gp0504 (struct libusb_transfer *transfer) { // for callback
-    unsigned char *data = transfer -> buffer;
-    struct libevdev_uinput *ud = transfer -> user_data;
+void callback_gp0504 (struct libusb_transfer *tx) { // for callback
+    unsigned char *data = tx -> buffer;
+    unsigned short temp;
+    struct libevdev_uinput *ud = tx -> user_data;
     switch(data[0]) {
         case 0x01:
             break;
         case 0x02:
             if((data[1] & 0xf0) != 0) {
-                ;
-//                libevdev_uinput_write_event(ud, ABS_X, )
+                //absolute x
+                temp = data[2];
+                temp <<= 8;
+                temp += data[3];
+                libevdev_uinput_write_event(ud, EV_ABS, ABS_X, temp);                  
+                //absolute y
+                temp = data[4];
+                temp <<= 8;
+                temp += data[5];
+                libevdev_uinput_write_event(ud, EV_ABS, ABS_Y, temp);
             }
             break;
         default: 
@@ -139,32 +149,31 @@ void callback_gp0504 (struct libusb_transfer *transfer) { // for callback
 }
 
 // determine which callback devices to use and how to initialize libevdev
-int init_ctrl(struct libusb_device * const d, struct libevdev * evdev, struct libevdev_uinput *uidev) {
+int init_ctrl(struct libusb_device * const d, struct libevdev **evdev, struct libevdev_uinput **uidev) {
+    printf("init_ctrl: %x\n", uidev);
     int is_ok = 0;
     if (d == NULL) {
         return is_ok;
     }
     struct libusb_device_descriptor desc;
     libusb_get_device_descriptor(d, &desc);
-    evdev = libevdev_new();
+    (*evdev) = libevdev_new();
     switch(desc.idProduct) {
         default: // every tablet has these features - allow fall through
-            libevdev_enable_event_type(evdev, EV_ABS); // enable absolute position
-            libevdev_enable_event_type(evdev, EV_KEY); // enable pen button
-            libevdev_enable_event_code(evdev, EV_KEY, BTN_LEFT, NULL);  // pen tap 
-            libevdev_enable_event_code(evdev, EV_KEY, BTN_RIGHT, NULL); // pen button
+            libevdev_enable_event_type((*evdev), EV_ABS); // enable absolute position
+            libevdev_enable_event_type((*evdev), EV_KEY); // enable pen button
+            libevdev_enable_event_code((*evdev), EV_KEY, BTN_LEFT, NULL);  // pen tap 
+            libevdev_enable_event_code((*evdev), EV_KEY, BTN_RIGHT, NULL); // pen button
         case PRODUCT_ID_GP0906:
             break;
         case PRODUCT_ID_APPIV0906:
             break;
         case PRODUCT_ID_GP0504:
-            libevdev_set_name(evdev, "Hanvon Graphicpal GP0504");
+            libevdev_set_name((*evdev), "Hanvon Graphicpal GP0504");
             break;
     }
-    int err = libevdev_uinput_create_from_device(evdev, LIBEVDEV_UINPUT_OPEN_MANAGED, &uidev);
-    if (err == 0) {
-        is_ok = 1;
-    }
+    int err = libevdev_uinput_create_from_device((*evdev), LIBEVDEV_UINPUT_OPEN_MANAGED, uidev);
+    printf("Initializing controls status: %x, \n", uidev);
     return is_ok;
 }
 
@@ -173,13 +182,16 @@ int handle_device_lusb(libusb_device *d) {
 	int status = libusb_open(d, &h);
 	if (status < 0 || h == NULL) {
 		printf("Error opening device, %i.\n", status);
-        libusb_exit(NULL);
         return 0;	
 	}
-
     struct libevdev         *evdev = NULL;
     struct libevdev_uinput  *uidev = NULL;
-    init_ctrl(d, evdev, uidev);
+    printf("handle_device: %x\n", uidev);
+    init_ctrl(d, &evdev, &uidev);
+    if (evdev == NULL || uidev == NULL) {
+        printf("Error initializing controls, %x, %x.\n", evdev, uidev);
+        return 0;
+    }
 
 	struct libusb_transfer *tx;
 	const int ENDPOINT_ADDR = 0x81;  // bEndpointAddress from lsusb -v
@@ -193,7 +205,7 @@ int handle_device_lusb(libusb_device *d) {
 					ENDPOINT_ADDR, 
 					buffer, 
 					AM_PACKET_LEN,
-					callback,
+					callback_gp0504,
 					uidev,     // extra data to send in tx    
 					130);      // timeout in milliseconds
     do {