kernel-module-udlfb: update to 0.2.2

4 files changed, 849 insertions, 614 deletions

diff --git a/recipes/libdlo/kernel-module-udlfb.bb b/recipes/libdlo/kernel-module-udlfb.bb
index f1352ef0c1..52cde6b47d 100644
--- a/recipes/libdlo/kernel-module-udlfb.bb
+++ b/recipes/libdlo/kernel-module-udlfb.bb
@@ -1,7 +1,7 @@
 DESCRIPTION = "Framebuffer console driver for displaylink based usb devices"
 LICENSE = "GPLv2"
 
-PV = "0.2"
+PV = "0.2.2"
 
 SRC_URI = "file://udlfb.c \
            file://dlfb.h \
diff --git a/recipes/libdlo/kernel-module-udlfb/dlfb.h b/recipes/libdlo/kernel-module-udlfb/dlfb.h
deleted file mode 100644
index fdc33ca1c4..0000000000
--- a/recipes/libdlo/kernel-module-udlfb/dlfb.h
+++ /dev/null
@@ -1,234 +0,0 @@
-#define MAX_VMODES 4
-#define FB_BPP 16
-
-#define AF_CONTROL "\xAF\x20\xFF\x00\xAF\x20\x20\x00\xAF\x20\x21\0\xAF\x20\x22\0\xAF\x20\x26\x28\xAF\x20\x27\x00\xAF\x20\x28\x00\xAF\x20\xFF\xFF\xAF\xA0"
-#define STD_CHANNEL        "\x57\xCD\xDC\xA7\x1C\x88\x5E\x15\x60\xFE\xC6\x97\x16\x3D\x47\xF2"
-
-// as libdlo
-#define BUF_HIGH_WATER_MARK 1024
-#define BUF_SIZE 64*1024
-
-// Data (and color functions) taken from libdlo (http://freedesktop.org/wiki/Software/libdlo)
-
-
-/** Return red/green component of a 16 bpp colour number. */
-#define DLO_RG16(red, grn) (uint8_t)((((red) & 0xF8) | ((grn) >> 5)) & 0xFF)
-
-/** Return green/blue component of a 16 bpp colour number. */
-#define DLO_GB16(grn, blu) (uint8_t)(((((grn) & 0x1C) << 3) | ((blu) >> 3)) & 0xFF)
-
-/** Return 8 bpp colour number from red, green and blue components. */
-#define DLO_RGB8(red, grn, blu) ((((red) << 5) | (((grn) & 3) << 3) | ((blu) & 7)) & 0xFF)
-
-/** Return a 32 bpp colour number when given the three RGB components. */
-#define DLO_RGB(red,grn,blu) (u32)(((red) & 0xFF) | (((grn) & 0xFF) << 8) | (((blu) & 0xFF) << 16))
-
-/** Read the red component (0..255) of a 32 bpp colour. */
-#define DLO_RGB_GETRED(col) (uint8_t)((col) & 0xFF)
-
-/** Read the green component (0..255) of a 32 bpp colour. */
-#define DLO_RGB_GETGRN(col) (uint8_t)(((col) >> 8) & 0xFF)
-
-/** Read the blue component (0..255) of a 32 bpp colour. */
-#define DLO_RGB_GETBLU(col) (uint8_t)(((col) >> 16) & 0xFF)
-
-
-static u32 read_pixel_565(const uint8_t * const ptr, const bool swap)
-{
-  u32 col;
-  uint16_t   *pix = (uint16_t *)ptr;
-  uint8_t     red, grn, blu;
-
-  col  = *pix;
-  red  = (col & 0x001F) << 3;
-  grn  = (col & 0x07E0) >> 3;
-  blu  = (col & 0xF800) >> 8;
-  red  = red | (red >> 5);
-  grn  = grn | (grn >> 5);
-  blu  = blu | (blu >> 5);
-
-  return swap ? DLO_RGB(blu, grn, red) : DLO_RGB(red, grn, blu);
-}
-
-static u16 rgb16(u32 col)
-{
-  uint8_t red = DLO_RGB_GETRED(col);
-  uint8_t grn = DLO_RGB_GETGRN(col);
-  uint8_t blu = DLO_RGB_GETBLU(col);
-
-  return (DLO_RG16(red, grn) << 8) + DLO_GB16(grn, blu);
-}
-
-
-
-struct dlfb_data {
-        struct usb_device       *udev;
-        struct usb_interface    *interface;
-        struct urb *tx_urb, *ctrl_urb ;
-        struct usb_ctrlrequest dr;
-        struct fb_info *info;
-        char *buf ;
-        char *bufend;
-        struct mutex bulk_mutex;
-        char edid[128];
-	int screen_size;
-	int line_length;
-};
-
-
-struct dlfb_video_mode {
-
-	int width ;
-	int height;
-	int bpp;
-	int hz;
-
-	char enable_data[146];
-	char data[146];
-};
-
-struct dlfb_video_mode dlfb_video_modes[MAX_VMODES] ;
-
-static void dlfb_bulk_callback(struct urb *urb) {
-
-        struct dlfb_data *dev_info = urb->context;
-
-        mutex_unlock(&dev_info->bulk_mutex);
-
-}
-
-static int dlfb_bulk_msg(struct dlfb_data *dev_info, int len) {
-
-        int clen;
-
-        /*
-        mutex_lock(&dev_info->bulk_mutex);
-
-        usb_fill_bulk_urb(dev_info->tx_urb, dev_info->udev, usb_sndbulkpipe(dev_info->udev, 1), dev_info->buf, len, dlfb_bulk_callback, dev_info);
-
-        dev_info->tx_urb->actual_length = 0;
-
-        return usb_submit_urb(dev_info->tx_urb, GFP_NOIO);
-        */
-
-        return usb_bulk_msg(dev_info->udev, usb_sndbulkpipe(dev_info->udev, 1), dev_info->buf, len, &clen, 0);
-}
-
-
-
-void dlfb_init_modes(void) {
-
-	dlfb_video_modes[0].width = 800 ;
-	dlfb_video_modes[0].height = 480 ;
-	dlfb_video_modes[0].bpp = 16 ;
-	dlfb_video_modes[0].hz = 60 ;
-	memcpy(dlfb_video_modes[0].enable_data,"\x7A\x12\x36\x0B\xEF\x21\x74\xD1\xF0\x06\x8F\x38\xE8\x71\xB4\xCE",16);
-	memcpy(dlfb_video_modes[0].data,"" \
-        	"\x78\x67\x19\xF3\xB3\xD6\x5D\x7B\x4C\xCA\x26\x78\x41\x19\x19\xAC" \
-        	"\xFF\x38\xB3\x10\x71\x89\x6A\xEC\xA8\xC1\x4F\x1F\x77\x86\x5D\x7E" \
-        	"\xCE\xAF\x65\x7D\xFC\x30\x51\x67\x1F\x48\x30\x8E\x7A\x4B\x8A\xD4" \
-        	"\xCB\x62\x45\x58\x5C\x22\x1D\x56\x6E\x2F\x60\xE2\x06\x6D\xA1\xE3" \
-        	"\x82\x5F\x67\x95\x7A\x9F\x87\x43\xD8\x33\xEF\x0B\x5A\xDA\x09\x4F" \
-        	"\xD7\x25\x6F\xBC\xF8\xC7\x09\x9C\x12\xC3\xA7\x6F\xE7\xED\xA8\x70" \
-        	"\x8C\xB9\x65\x53\xDD\xA6\x7D\xDE\xD9\x4F\xDD\xD4\x6F\x28\xD6\x14" \
-        	"\xDC\x2D\x41\x53\x33\xD9\x0A\x86\x11\x3C\x41\x5A\x56\x48\xF9\x85" \
-        	"\x2B\x2F\x22\x66\x20\x39\xDA\xA1\x50\xCB\x5A\x58\x7D\x97\xFA\x2C" \
-        	"\x64\x9D",146);
-
-	dlfb_video_modes[1].width = 1024 ;
-	dlfb_video_modes[1].height = 768 ;
-	dlfb_video_modes[1].bpp = 16 ;
-	dlfb_video_modes[1].hz = 60 ;
-	memcpy(dlfb_video_modes[1].enable_data,"\xB6\xF8\xFC\x00\xF3\xE4\x81\x1E\xC5\x60\xA3\x79\xE5\x35\xC5\x15",16);
-	memcpy(dlfb_video_modes[1].data,"" \
-		"\xDD\x2A\x3A\x49\xE9\x99\xE3\xC8\xA0\xBA\x23\x3A\x3D\xEB\x21\xE4" \
-        	"\xA5\x54\x25\x0D\x51\xCC\xE6\x52\xA7\xD7\xCD\xFA\xD5\x9B\x5B\x41" \
-        	"\x0B\x49\xAB\xC6\xE3\x1A\xF2\x87\x81\x32\xF0\x3E\x40\x00\x51\x40" \
-        	"\x9E\x94\xF1\x22\xEE\xAC\xB2\xA2\x6B\x4D\xC4\x41\x5A\x9C\x45\x62" \
-        	"\x4F\x4E\x61\xDB\x1F\x0E\x79\x66\xE2\x20\x83\x9E\x2C\xAB\x28\x38" \
-        	"\xAC\xC1\x22\x81\xA5\x69\xFD\xFB\x26\x15\xF9\xC9\xFA\x90\xF2\x66" \
-        	"\x85\xC5\xAA\xA6\x4D\x8B\xC8\xA6\x03\x32\xDF\x98\xA9\x77\x9E\x57" \
-        	"\xEA\xC9\x9E\x29\xED\xFC\xC4\x78\x26\x0B\x2E\xC2\x41\x7C\x4A\xA3" \
-        	"\xAB\x66\x01\xA0\xE5\xA4\x8B\x80\xA0\x53\xE5\x5D\x59\x63\x62\xE8" \
-        	"\xFE\x6B",146);
-
-	dlfb_video_modes[2].width = 1280 ;
-	dlfb_video_modes[2].height = 1024 ;
-	dlfb_video_modes[2].bpp = 16 ;
-	dlfb_video_modes[2].hz = 60 ;
-	memcpy(dlfb_video_modes[2].enable_data,"\x6A\xF0\x37\x50\x63\xEF\xD2\xA9\x6F\x75\x72\xBB\xC7\x7B\x6F\x1A",16);
-	memcpy(dlfb_video_modes[2].data,"" \
-		"\x23\x4A\x78\x7C\xD1\xB8\x0E\x6B\x15\x93\x96\x77\x78\x44\xCC\x16" \
-        	"\x7F\xE3\xD7\x39\x3F\x2E\x99\xD2\xB9\x68\x8E\xC4\x1A\x9B\xF4\x35" \
-        	"\x61\xB5\x48\x5C\x94\xA6\x84\xB2\x88\x2B\x47\x84\x84\x73\x7F\x2C" \
-        	"\xD0\xC4\x3D\x5D\x20\x61\x4A\xB1\x73\x4C\xDD\x6A\xB4\xFD\xE9\x94" \
-        	"\x3C\xD1\x44\x0A\x08\xCD\xF5\xE5\xBD\x0D\x99\xCD\x9C\x2A\xC9\x06" \
-        	"\x1D\x22\x1C\xB1\x9A\x94\x95\x65\x3C\x43\x19\x73\x83\xF7\x51\x1F" \
-        	"\x5C\x3C\xE1\x59\xD5\xC3\xF2\x27\x28\xCE\x22\x7B\x2A\x70\x04\xE4" \
-        	"\xD9\xFE\x8A\x6E\x28\x27\xC5\x40\x4E\xF8\x83\x5B\x82\x41\xA6\x62" \
-        	"\xC1\x73\x3A\x5C\xF6\x90\x43\x39\xF2\xF5\x74\x80\x74\x44\xBD\xB1" \
-        	"\x08\x53",146);
-
-	dlfb_video_modes[3].width = 1400 ;
-	dlfb_video_modes[3].height = 1050 ;
-	dlfb_video_modes[3].bpp = 16 ;
-	dlfb_video_modes[3].hz = 60 ;
-	memcpy(dlfb_video_modes[3].enable_data,"\x95\xCB\x91\xE5\xA8\x28\xFB\x87\xD5\x92\x1C\x44\x66\x57\x8A\x98",16);
-	memcpy(dlfb_video_modes[3].data,"" \
-		"\xC6\x8C\x42\x4C\x95\xDA\xB4\x2F\xBD\xD9\x9E\xAD\x8F\x7B\x69\x15" \
-        	"\x1B\xDA\x06\x79\x23\x9E\x94\xF2\xC2\xE9\xBB\x34\x13\x6B\x9B\xB2" \
-        	"\xC1\x4E\xD8\x69\x81\x49\x6E\x64\xAF\xB2\x4E\x69\x24\x1A\xA8\xBB" \
-        	"\x4E\x11\x75\x38\xE6\xC9\x3D\xE9\x9A\xCC\x3B\xAA\x1F\xC4\x97\xD5" \
-        	"\x4A\x9D\xAA\xE7\x04\xF0\xB6\xD4\xBD\xE4\x41\xCF\xF8\xA2\x77\x0B" \
-        	"\x46\x9D\x3A\xBD\x73\xC0\x64\x76\x84\x2B\xD7\x11\xF3\x43\xB5\xF6" \
-        	"\xE9\x0B\xB3\x4E\x2B\x80\x98\x15\xDC\xDA\x46\xE8\xEC\xBD\x0B\x0E" \
-        	"\x64\x20\xF7\x17\x17\x33\x75\xBA\x30\x26\xDD\xFA\xA0\x99\x23\x11" \
-        	"\xF1\xDE\x80\xB7\xD6\xB0\xB7\xA2\xA9\xBD\x6D\x29\x42\x74\x75\x73" \
-        	"\xC5\x27",146);
-
-}
-
-int dlfb_set_video_mode(struct dlfb_data *dev_info, int width, int height) {
-
-	int i, ret;
-
-	for(i=0;i<MAX_VMODES;i++) {
-		printk("INIT VIDEO %d %d %d\n",i, dlfb_video_modes[i].width, dlfb_video_modes[i].height);
-		if (dlfb_video_modes[i].width == width && dlfb_video_modes[i].height == height) {
-
-			memcpy(dev_info->buf, STD_CHANNEL, 16);
-        		ret = usb_control_msg(dev_info->udev, usb_sndctrlpipe(dev_info->udev, 0), 0x12, (0x02 << 5), 0, 0, dev_info->buf, 16, 0);
-        		printk("ret control msg 1 (STD_CHANNEL): %d\n", ret);
-
-        		memcpy(dev_info->buf, AF_CONTROL, sizeof(AF_CONTROL)-1);
-        		ret = dlfb_bulk_msg(dev_info, sizeof(AF_CONTROL)-1);
-        		printk("ret bulk 1: %d\n", ret);
-
-
-        		memcpy(dev_info->buf, &dlfb_video_modes[i].enable_data, 16);
-        		ret = usb_control_msg(dev_info->udev, usb_sndctrlpipe(dev_info->udev, 0), 0x12, (0x02 << 5), 0, 0, dev_info->buf, 16, 0);
-        		printk("ret control msg 2: %d\n", ret);
-
-
-        		// MODE_DATA
-        		memcpy(dev_info->buf, &dlfb_video_modes[i].data, 146);
-        		ret = dlfb_bulk_msg(dev_info, 146);
-        		printk("ret bulk 2: %d\n", ret);
-
-        		memcpy(dev_info->buf, STD_CHANNEL, sizeof(STD_CHANNEL)-1);
-        		ret = usb_control_msg(dev_info->udev, usb_sndctrlpipe(dev_info->udev, 0), 0x12, (0x02 << 5), 0, 0, dev_info->buf, sizeof(STD_CHANNEL)-1, 0);
-        		printk("ret control msg 3: %d\n", ret);
-
-        		// flush
-        		ret = dlfb_bulk_msg(dev_info, 0);
-        		printk("ret bulk 3: %d\n", ret);
-	
-			dev_info->screen_size = width*height*(FB_BPP/8) ;
-			dev_info->line_length = width*(FB_BPP/8) ;
-
-			return 0;
-		}
-	}
-
-	return -1 ;
-}
diff --git a/recipes/libdlo/kernel-module-udlfb/udlfb.c b/recipes/libdlo/kernel-module-udlfb/udlfb.c
index 32f2b30134..96fdb3e7d5 100644
--- a/recipes/libdlo/kernel-module-udlfb/udlfb.c
+++ b/recipes/libdlo/kernel-module-udlfb/udlfb.c
@@ -1,14 +1,16 @@
-/*****************************************************************************
- *                          DLFB Kernel Driver                               *
- *                            Version 0.2rc1 (udlfb)                            *
- *             (C) 2009 Roberto De Ioris <roberto@unbit.it>                  *
- *                                                                           *
- *     This file is licensed under the GPLv2. See COPYING in the package.      *
- * Based on the amazing work of Florian Echtler and libdlo 0.1               *
- *                                                                           *
- *                                                                           *
- * 22.05.09 First public (ugly) release                                      *
- *****************************************************************************/
+/************************************************************************************
+ *                          DLFB Kernel Driver                                      *
+ *                            Version 0.2 (udlfb)                                   *
+ *             (C) 2009 Roberto De Ioris <roberto@unbit.it>                         *
+ *                                                                                  *
+ *     This file is licensed under the GPLv2. See COPYING in the package.           *
+ * Based on the amazing work of Florian Echtler and libdlo 0.1                      *
+ *                                                                                  *
+ *                                                                           	    *	
+ * 05.06.09 release 0.2.2 (real screen blanking, rle compression, double buffer)    *
+ * 31.05.09 release 0.2                                                      	    *
+ * 22.05.09 First public (ugly) release                                             *
+ ************************************************************************************/
 
 #include <linux/module.h>
 #include <linux/kernel.h>
@@ -20,472 +22,702 @@
 #include <linux/mutex.h>
 #include <linux/vmalloc.h>
 
-#include "dlfb.h"
+#include "udlfb.h"
 
+#define DRIVER_VERSION "DLFB 0.2"
 
-#define DRIVER_VERSION "DLFB 0.2rc2"
-
-
-// memory functions taken from vfb
+/* memory functions taken from vfb */
 
 static void *rvmalloc(unsigned long size)
 {
-        void *mem;
-        unsigned long adr;
-
-        size = PAGE_ALIGN(size);
-        mem = vmalloc_32(size);
-        if (!mem)
-                return NULL;
-
-        memset(mem, 0, size); /* Clear the ram out, no junk to the user */
-        adr = (unsigned long) mem;
-        while (size > 0) {
-                SetPageReserved(vmalloc_to_page((void *)adr));
-                adr += PAGE_SIZE;
-                size -= PAGE_SIZE;
-        }
+	void *mem;
+	unsigned long adr;
+
+	size = PAGE_ALIGN(size);
+	mem = vmalloc_32(size);
+	if (!mem)
+		return NULL;
+
+	memset(mem, 0, size);	/* Clear the ram out, no junk to the user */
+	adr = (unsigned long)mem;
+	while (size > 0) {
+		SetPageReserved(vmalloc_to_page((void *)adr));
+		adr += PAGE_SIZE;
+		size -= PAGE_SIZE;
+	}
 
-        return mem;
+	return mem;
 }
 
 static void rvfree(void *mem, unsigned long size)
 {
-        unsigned long adr;
+	unsigned long adr;
 
-        if (!mem)
-                return;
+	if (!mem)
+		return;
 
-        adr = (unsigned long) mem;
-        while ((long) size > 0) {
-                ClearPageReserved(vmalloc_to_page((void *)adr));
-                adr += PAGE_SIZE;
-                size -= PAGE_SIZE;
-        }
-        vfree(mem);
+	adr = (unsigned long)mem;
+	while ((long)size > 0) {
+		ClearPageReserved(vmalloc_to_page((void *)adr));
+		adr += PAGE_SIZE;
+		size -= PAGE_SIZE;
+	}
+	vfree(mem);
 }
 
-static int dlfb_mmap(struct fb_info *info,
-                    struct vm_area_struct *vma)
+static int dlfb_mmap(struct fb_info *info, struct vm_area_struct *vma)
 {
-        unsigned long start = vma->vm_start;
-        unsigned long size = vma->vm_end - vma->vm_start;
-        unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
-        unsigned long page, pos;
+	unsigned long start = vma->vm_start;
+	unsigned long size = vma->vm_end - vma->vm_start;
+	unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
+	unsigned long page, pos;
 
 	printk("MMAP: %lu %u\n", offset + size, info->fix.smem_len);
 
-        if (offset + size > info->fix.smem_len) {
-                return -EINVAL;
-        }
-
-        pos = (unsigned long)info->fix.smem_start + offset;
+	if (offset + size > info->fix.smem_len)
+		return -EINVAL;
 
-        while (size > 0) {
-                page = vmalloc_to_pfn((void *)pos);
-                if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED)) {
-                        return -EAGAIN;
-                }
-                start += PAGE_SIZE;
-                pos += PAGE_SIZE;
-                if (size > PAGE_SIZE)
-                        size -= PAGE_SIZE;
-                else
-                        size = 0;
-        }
+	pos = (unsigned long)info->fix.smem_start + offset;
 
-        vma->vm_flags |= VM_RESERVED;   /* avoid to swap out this VMA */
-        return 0;
+	while (size > 0) {
+		page = vmalloc_to_pfn((void *)pos);
+		if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED))
+			return -EAGAIN;
 
-}
+		start += PAGE_SIZE;
+		pos += PAGE_SIZE;
+		if (size > PAGE_SIZE)
+			size -= PAGE_SIZE;
+		else
+			size = 0;
+	}
 
-//
+	vma->vm_flags |= VM_RESERVED;	/* avoid to swap out this VMA */
+	return 0;
 
+}
 
-//ioctl structure
+/* ioctl structure */
 struct dloarea {
-        int x,y;
-        int w,h;
+	int x, y;
+	int w, h;
+	int x2, y2;
 };
 
 /*
-
 static struct usb_device_id id_table [] = {
 	{ USB_DEVICE(0x17e9, 0x023d) },
-        { }
+	{ }
 };
-
 */
 
-static struct usb_device_id id_table [] = {
-        { .idVendor = 0x17e9, .match_flags = USB_DEVICE_ID_MATCH_VENDOR, },
-        { },
+static struct usb_device_id id_table[] = {
+	{.idVendor = 0x17e9, .match_flags = USB_DEVICE_ID_MATCH_VENDOR,},
+	{},
 };
+MODULE_DEVICE_TABLE(usb, id_table);
+
+static struct usb_driver dlfb_driver;
 
+// thanks to Henrik Bjerregaard Pedersen for this function
+static char *
+rle_compress16(uint16_t *src, char *dst, int rem)
+{
 
+    int rl;
+    uint16_t pix0;
+    char *end_if_raw = dst + 6 + 2 * rem;
 
-MODULE_DEVICE_TABLE (usb, id_table);
+    dst += 6; // header will be filled in if RLE is worth it
 
-static struct usb_driver dlfb_driver;
+    while (rem && dst < end_if_raw) {
+        char *start = (char *)src;
 
-static int image_blit(struct dlfb_data *dev_info, int x, int y, int width, int height, char *data) {
-	
-	int i,j,base ;
-	int rem = width ;
+        pix0 = *src++;
+        rl = 1;
+        rem--;
+        while (rem && *src == pix0)
+            rem--, rl++, src++;
+        *dst++ = rl;
+        *dst++ = start[1];
+        *dst++ = start[0];
+    }
+
+    return dst;
+}
+
+/*
+Thanks to Henrik Bjerregaard Pedersen for rle implementation and code refactoring.
+Next step is huffman compression.
+*/
+
+static int
+image_blit(struct dlfb_data *dev_info, int x, int y, int width, int height,
+	   char *data)
+{
+
+	int i, j, base;
+	int rem = width;
 	int ret;
-	u32 col;
-	u16 dlocol ;
-	
 
-	char *bufptr ;
+	int firstdiff, thistime;
+
+	char *bufptr;
 
-	if (x+width > dev_info->info->var.xres) {
+	if (x + width > dev_info->info->var.xres) {
 		return -EINVAL;
 	}
 
-	if (y+height > dev_info->info->var.yres) {
+	if (y + height > dev_info->info->var.yres) {
 		return -EINVAL;
 	}
 
+	mutex_lock(&dev_info->bulk_mutex);
 
-	base = (dev_info->info->var.xres*2*y)+(x*2) ;
+	base = dev_info->base16 + ( (dev_info->info->var.xres * 2 * y) + (x * 2) );
 
-	data += (dev_info->info->var.xres*2*y)+(x*2) ;
+	data += (dev_info->info->var.xres * 2 * y) + (x * 2);
 
 	//printk("IMAGE_BLIT\n");
 
-	bufptr = dev_info->buf ;
+	bufptr = dev_info->buf;
 
-        for(i = y;i<y+height;i++) {
+	for (i = y; i < y + height; i++) {
 
 		if (dev_info->bufend - bufptr < BUF_HIGH_WATER_MARK) {
-                        ret = dlfb_bulk_msg(dev_info, bufptr-dev_info->buf);
-			bufptr = dev_info->buf ;
+			ret = dlfb_bulk_msg(dev_info, bufptr - dev_info->buf);
+			bufptr = dev_info->buf;
 		}
 
-                rem = width ;
+		rem = width;
 
 		//printk("WRITING LINE %d\n", i);
 
-                while(rem) {
+		while (rem) {
 
 			if (dev_info->bufend - bufptr < BUF_HIGH_WATER_MARK) {
-                        	ret = dlfb_bulk_msg(dev_info, bufptr-dev_info->buf);
-                        	bufptr = dev_info->buf ;
-                	}
-
-                        *bufptr++ = 0xAF ;
-                        *bufptr++ = 0x68 ;
-
-                        *bufptr++ = (char)(base >> 16) ;
-                        *bufptr++ = (char)(base >> 8) ;
-                        *bufptr++ = (char)(base) ;
-
-                        if (rem > 255) {
-                                *bufptr++ = 255 ;
-				for(j=0;j<510;j+=2) {
-					col = read_pixel_565(data+j, 1);
-					dlocol = ntohs(rgb16(col));
-					memcpy(bufptr, &dlocol, 2); 
-					bufptr+=2;
+				ret =
+				    dlfb_bulk_msg(dev_info,
+						  bufptr - dev_info->buf);
+				bufptr = dev_info->buf;
+			}
+
+            // number of pixels to consider this time
+            thistime = rem;
+            if (thistime > 255)
+                 thistime = 255;
+
+            // find position of first pixel that has changed
+			firstdiff = -1;
+			for (j = 0; j < thistime * 2; j++) {
+				if (dev_info->
+				    backing_buffer[ base - dev_info->base16 + j] !=
+				    data[j]) {
+					firstdiff = j/2;
+					break;
 				}
-                                rem-=255;
-                                base+=510;
-				data+= 510;
-                        } 
-                        else {
-                                *bufptr++ = rem ;
-				for(j=0;j<rem*2;j+=2) {
-                                        col = read_pixel_565(data+j, 1);
-                                        dlocol = ntohs(rgb16(col));
-                                        memcpy(bufptr, &dlocol, 2);
-					bufptr+=2;
-                                }
-                                base+= rem*2 ;
-				data+= rem*2;
-                                rem = 0 ;
-                        }
+			}
 
+			if (firstdiff >= 0) {
+                char *end_of_rle;
+
+                end_of_rle =
+                    rle_compress16((uint16_t *)(data + firstdiff * 2),
+                                     bufptr, thistime-firstdiff);
+
+                if (end_of_rle < bufptr + 6 + 2 * (thistime-firstdiff)) {
+                    bufptr[0] = 0xAF;
+		   		    bufptr[1] = 0x69;
+
+				    bufptr[2] = (char)((base+firstdiff*2) >> 16);
+				    bufptr[3] = (char)((base+firstdiff*2) >> 8);
+				    bufptr[4] = (char)(base+firstdiff*2);
+                    bufptr[5] = thistime-firstdiff;
+ 
+                    bufptr = end_of_rle;
+
+                } else {
+                    // fallback to raw (or some other encoding?)
+                    *bufptr++ = 0xAF;
+		   		    *bufptr++ = 0x68;
+
+				    *bufptr++ = (char)((base+firstdiff*2) >> 16);
+				    *bufptr++ = (char)((base+firstdiff*2) >> 8);
+				    *bufptr++ = (char)(base+firstdiff*2);
+				    *bufptr++ = thistime-firstdiff;
+				    // PUT COMPRESSION HERE
+				    for (j = firstdiff * 2; j < thistime * 2; j += 2) {
+					    *bufptr++ = data[j + 1];
+					    *bufptr++ = data[j];
+				    }
                 }
+			}
 
-                base += (dev_info->info->var.xres*2)-(width*2) ;
-		data += (dev_info->info->var.xres*2)-(width*2) ;
+			base += thistime * 2;
+			data += thistime * 2;
+			rem -= thistime;
+		}
 
-        }
+		memcpy(dev_info->backing_buffer + (base-dev_info->base16) - (width * 2),
+		       data - (width * 2), width * 2);
+
+		base += (dev_info->info->var.xres * 2) - (width * 2);
+		data += (dev_info->info->var.xres * 2) - (width * 2);
+
+	}
 
 	if (bufptr > dev_info->buf) {
-        	ret = dlfb_bulk_msg(dev_info, bufptr-dev_info->buf);
+		ret = dlfb_bulk_msg(dev_info, bufptr - dev_info->buf);
 	}
 
-        return base ;
-}
+	mutex_unlock(&dev_info->bulk_mutex);
+
+	return base;
 
-static int draw_rect(struct dlfb_data *dev_info, int x, int y, int width, int height, unsigned char red, unsigned char green, unsigned char blue) {
+}
+static int
+draw_rect(struct dlfb_data *dev_info, int x, int y, int width, int height,
+	  unsigned char red, unsigned char green, unsigned char blue)
+{
 
-	int i,base ;
-	int ret  ;
-	unsigned short col = (((((red) & 0xF8) | ((green) >> 5)) & 0xFF) << 8) + (((((green) & 0x1C) << 3) | ((blue) >> 3)) & 0xFF) ;
-	int rem = width ;
+	int i, j, base;
+	int ret;
+	unsigned short col =
+	    (((((red) & 0xF8) | ((green) >> 5)) & 0xFF) << 8) +
+	    (((((green) & 0x1C) << 3) | ((blue) >> 3)) & 0xFF);
+	int rem = width;
 
-	char *bufptr ;
+	char *bufptr;
 
-	if (x+width > dev_info->info->var.xres) {
+	if (x + width > dev_info->info->var.xres)
 		return -EINVAL;
-	}
 
-	if (y+height > dev_info->info->var.yres) {
+	if (y + height > dev_info->info->var.yres)
 		return -EINVAL;
-	}
 
-	base = (dev_info->info->var.xres*2*y)+(x*2) ;
+	mutex_lock(&dev_info->bulk_mutex);
+
+	base = dev_info->base16 + (dev_info->info->var.xres * 2 * y) + (x * 2);
 
-	bufptr = dev_info->buf ;
+	bufptr = dev_info->buf;
 
-	for(i = y;i<y+height;i++) {
+	for (i = y; i < y + height; i++) {
 
+		for (j = 0; j < width * 2; j += 2) {
+			dev_info->backing_buffer[base - dev_info->base16 + j] = (char)(col >> 8);
+			dev_info->backing_buffer[base - dev_info->base16 + j + 1] = (char)(col);
+		}
 		if (dev_info->bufend - bufptr < BUF_HIGH_WATER_MARK) {
-                	ret = dlfb_bulk_msg(dev_info, bufptr-dev_info->buf);
-                        bufptr = dev_info->buf ;
-                }
+			ret = dlfb_bulk_msg(dev_info, bufptr - dev_info->buf);
+			bufptr = dev_info->buf;
+		}
 
-		rem = width ;
+		rem = width;
 
-		while(rem) {
+		while (rem) {
 
 			if (dev_info->bufend - bufptr < BUF_HIGH_WATER_MARK) {
-                                ret = dlfb_bulk_msg(dev_info, bufptr-dev_info->buf);
-                                bufptr = dev_info->buf ;
-                        }
+				ret =
+				    dlfb_bulk_msg(dev_info,
+						  bufptr - dev_info->buf);
+				bufptr = dev_info->buf;
+			}
 
-			*bufptr++ = 0xAF ;
-			*bufptr++ = 0x69 ;
+			*bufptr++ = 0xAF;
+			*bufptr++ = 0x69;
 
-			*bufptr++ = (char)(base >> 16) ;
-			*bufptr++ = (char)(base >> 8) ;
-			*bufptr++ = (char)(base) ;
+			*bufptr++ = (char)(base >> 16);
+			*bufptr++ = (char)(base >> 8);
+			*bufptr++ = (char)(base);
 
 			if (rem > 255) {
-				*bufptr++ = 255 ;
-				*bufptr++ = 255 ;
-				rem-=255;
-				base+=255*2;
-			} 
-			else {
-				*bufptr++ = rem ;
-				*bufptr++ = rem ;
-				base+= rem*2 ;
-				rem = 0 ;	
+				*bufptr++ = 255;
+				*bufptr++ = 255;
+				rem -= 255;
+				base += 255 * 2;
+			} else {
+				*bufptr++ = rem;
+				*bufptr++ = rem;
+				base += rem * 2;
+				rem = 0;
 			}
 
-			*bufptr++ = (char) (col >> 8) ;
-			*bufptr++ = (char) (col) ;
+			*bufptr++ = (char)(col >> 8);
+			*bufptr++ = (char)(col);
 
 		}
 
-		base+= (dev_info->info->var.xres*2)-(width*2) ;
-		
+		base += (dev_info->info->var.xres * 2) - (width * 2);
+
 	}
 
-	if (bufptr > dev_info->buf) {
-                ret = dlfb_bulk_msg(dev_info, bufptr-dev_info->buf);
-        }
+	if (bufptr > dev_info->buf)
+		ret = dlfb_bulk_msg(dev_info, bufptr - dev_info->buf);
+
+	mutex_unlock(&dev_info->bulk_mutex);
 
-	return 1 ;
+	return 1;
+}
+
+static void swapfb(struct dlfb_data *dev_info) {
+
+	int tmpbase;
+	char *bufptr;
+
+	mutex_lock(&dev_info->bulk_mutex);
+
+	tmpbase = dev_info->base16 ;
+
+	dev_info->base16 = dev_info->base16d;
+	dev_info->base16d = tmpbase;
+
+	bufptr = dev_info->buf;
+
+	bufptr = dlfb_set_register(bufptr, 0xFF, 0x00);
+	
+			// set addresses
+        		bufptr =
+        		dlfb_set_register(bufptr, 0x20,
+                                              (char)(dev_info->base16 >> 16));
+                        bufptr =
+                            dlfb_set_register(bufptr, 0x21,
+                                              (char)(dev_info->base16 >> 8));
+                        bufptr =
+                            dlfb_set_register(bufptr, 0x22,
+                                              (char)(dev_info->base16));
+
+	bufptr = dlfb_set_register(bufptr, 0xFF, 0x00);
+
+	dlfb_bulk_msg(dev_info, bufptr - dev_info->buf);
+
+	mutex_unlock(&dev_info->bulk_mutex);
 }
 
-static int copyarea(struct dlfb_data *dev_info, int dx, int dy, int sx, int sy, int width, int height) {
+static int copyfb(struct dlfb_data *dev_info)
+{
+	int base;
+        int source;
+        int rem;
+        int i, ret;
+
+        char *bufptr;
+
+
+	base = dev_info->base16d;
+
+	mutex_lock(&dev_info->bulk_mutex);
+
+	source = dev_info->base16;
+
+	bufptr = dev_info->buf;
+
+	for (i = 0; i < dev_info->info->var.yres; i++) {
+
+		if (dev_info->bufend - bufptr < BUF_HIGH_WATER_MARK) {
+                        ret = dlfb_bulk_msg(dev_info, bufptr - dev_info->buf);
+                        bufptr = dev_info->buf;
+                }
+
+                rem = dev_info->info->var.xres;
+
+		while (rem) {
+
+                        if (dev_info->bufend - bufptr < BUF_HIGH_WATER_MARK) {
+                                ret =
+                                    dlfb_bulk_msg(dev_info,
+                                                  bufptr - dev_info->buf);
+                                bufptr = dev_info->buf;
+
+			}
+
+                        *bufptr++ = 0xAF;
+                        *bufptr++ = 0x6A;
+
+                        *bufptr++ = (char)(base >> 16);
+                        *bufptr++ = (char)(base >> 8);
+                        *bufptr++ = (char)(base);
+
+			 if (rem > 255) {
+                                *bufptr++ = 255;
+                                *bufptr++ = (char)(source >> 16);
+                                *bufptr++ = (char)(source >> 8);
+                                *bufptr++ = (char)(source);
+
+                                rem -= 255;
+                                base += 255 * 2;
+                                source += 255 * 2;
+
+                        } else {
+                                *bufptr++ = rem;
+                                *bufptr++ = (char)(source >> 16);
+                                *bufptr++ = (char)(source >> 8);
+                                *bufptr++ = (char)(source);
+
+                                base += rem * 2;
+                                source += rem * 2;
+                                rem = 0;
+                        }
+                }
+        }
+
+        if (bufptr > dev_info->buf)
+                ret = dlfb_bulk_msg(dev_info, bufptr - dev_info->buf);
+
+        mutex_unlock(&dev_info->bulk_mutex);
+		
+	return 1;
+	
+}
 
-	int base ;
-	int source ;
-	int rem ;
+static int
+copyarea(struct dlfb_data *dev_info, int dx, int dy, int sx, int sy,
+	 int width, int height)
+{
+	int base;
+	int source;
+	int rem;
 	int i, ret;
 
-	char *bufptr ;
+	char *bufptr;
 
-	if (dx+width > dev_info->info->var.xres) {
+	if (dx + width > dev_info->info->var.xres)
 		return -EINVAL;
-	}
 
-	if (dy+height > dev_info->info->var.yres) {
+	if (dy + height > dev_info->info->var.yres)
 		return -EINVAL;
-	}
 
-	base = (dev_info->info->var.xres*2*dy)+(dx*2) ;
-	source = (dev_info->info->var.xres*2*sy)+(sx*2) ;
+	mutex_lock(&dev_info->bulk_mutex);
 
-	bufptr = dev_info->buf ;
+	base =
+	    dev_info->base16 + (dev_info->info->var.xres * 2 * dy) + (dx * 2);
+	source = (dev_info->info->var.xres * 2 * sy) + (sx * 2);
 
-	for(i = sy;i<sy+height;i++) {
+	bufptr = dev_info->buf;
+
+	for (i = sy; i < sy + height; i++) {
+
+		memcpy(dev_info->backing_buffer + base - dev_info->base16,
+		       dev_info->backing_buffer + source, width * 2);
 
 		if (dev_info->bufend - bufptr < BUF_HIGH_WATER_MARK) {
-                	ret = dlfb_bulk_msg(dev_info, bufptr-dev_info->buf);
-                        bufptr = dev_info->buf ;
-                }
+			ret = dlfb_bulk_msg(dev_info, bufptr - dev_info->buf);
+			bufptr = dev_info->buf;
+		}
 
-		rem = width ;
+		rem = width;
 
-		while(rem) {
+		while (rem) {
 
 			if (dev_info->bufend - bufptr < BUF_HIGH_WATER_MARK) {
-                		ret = dlfb_bulk_msg(dev_info, bufptr-dev_info->buf);
-                        	bufptr = dev_info->buf ;
-                	}
+				ret =
+				    dlfb_bulk_msg(dev_info,
+						  bufptr - dev_info->buf);
+				bufptr = dev_info->buf;
+			}
 
-			*bufptr++ = 0xAF ;
-			*bufptr++ = 0x6A ;
-	
-			*bufptr++ = (char)(base >> 16) ;
-                        *bufptr++ = (char)(base >> 8) ;
-                        *bufptr++ = (char)(base) ;
+			*bufptr++ = 0xAF;
+			*bufptr++ = 0x6A;
 
-			if (rem > 255) {
-                                *bufptr++ = 255 ;
-				*bufptr++ = (char)(source >> 16) ;
-                        	*bufptr++ = (char)(source >> 8) ;
-                        	*bufptr++ = (char)(source) ;
-				
-                                rem-=255;
-                                base+=255*2;
-				source+=255*2;
+			*bufptr++ = (char)(base >> 16);
+			*bufptr++ = (char)(base >> 8);
+			*bufptr++ = (char)(base);
 
-                        }
-                        else {
-				*bufptr++ = rem ;
-                                *bufptr++ = (char)(source >> 16) ;
-                                *bufptr++ = (char)(source >> 8) ;
-                                *bufptr++ = (char)(source) ;
-
-                                base+= rem*2 ;
-                                source+= rem*2 ;
-                                rem = 0 ;
-                        }
-			
+			if (rem > 255) {
+				*bufptr++ = 255;
+				*bufptr++ = (char)(source >> 16);
+				*bufptr++ = (char)(source >> 8);
+				*bufptr++ = (char)(source);
+
+				rem -= 255;
+				base += 255 * 2;
+				source += 255 * 2;
+
+			} else {
+				*bufptr++ = rem;
+				*bufptr++ = (char)(source >> 16);
+				*bufptr++ = (char)(source >> 8);
+				*bufptr++ = (char)(source);
+
+				base += rem * 2;
+				source += rem * 2;
+				rem = 0;
+			}
 		}
 
-		base+= (dev_info->info->var.xres*2)-(width*2) ;
-		source += (dev_info->info->var.xres*2)-(width*2) ;
-		
+		base += (dev_info->info->var.xres * 2) - (width * 2);
+		source += (dev_info->info->var.xres * 2) - (width * 2);
 	}
 
-	if (bufptr > dev_info->buf) {
-                ret = dlfb_bulk_msg(dev_info, bufptr-dev_info->buf);
-        }
+	if (bufptr > dev_info->buf)
+		ret = dlfb_bulk_msg(dev_info, bufptr - dev_info->buf);
+
+	mutex_unlock(&dev_info->bulk_mutex);
 
-	
 	return 1;
 }
 
-void dlfb_copyarea(struct fb_info *info, const struct fb_copyarea *area) {
+static void dlfb_copyarea(struct fb_info *info, const struct fb_copyarea *area)
+{
 
-        struct dlfb_data *dev = info->par;
+	struct dlfb_data *dev = info->par;
 
-	copyarea(dev, area->dx, area->dy, area->sx, area->sy, area->width, area->height) ;
-	
+	copyarea(dev, area->dx, area->dy, area->sx, area->sy, area->width,
+		 area->height);
 
-	//printk("COPY AREA %d %d %d %d %d %d !!!\n", area->dx, area->dy, area->sx, area->sy, area->width, area->height);
+	/* printk("COPY AREA %d %d %d %d %d %d !!!\n", area->dx, area->dy, area->sx, area->sy, area->width, area->height); */
 
 }
 
-void dlfb_imageblit(struct fb_info *info, const struct fb_image *image) {
+static void dlfb_imageblit(struct fb_info *info, const struct fb_image *image)
+{
 
 	int ret;
 	struct dlfb_data *dev = info->par;
-	//printk("IMAGE BLIT (1) %d %d %d %d DEPTH %d {%p}!!!\n", image->dx, image->dy, image->width, image->height, image->depth, dev->udev);
+	/* printk("IMAGE BLIT (1) %d %d %d %d DEPTH %d {%p}!!!\n", image->dx, image->dy, image->width, image->height, image->depth, dev->udev); */
 	cfb_imageblit(info, image);
-	ret = image_blit(dev, image->dx, image->dy, image->width, image->height, info->screen_base);
-	//printk("IMAGE BLIT (2) %d %d %d %d DEPTH %d {%p} %d!!!\n", image->dx, image->dy, image->width, image->height, image->depth, dev->udev, ret);
+	ret =
+	    image_blit(dev, image->dx, image->dy, image->width, image->height,
+		       info->screen_base);
+	/* printk("IMAGE BLIT (2) %d %d %d %d DEPTH %d {%p} %d!!!\n", image->dx, image->dy, image->width, image->height, image->depth, dev->udev, ret); */
 }
 
-void dlfb_fillrect(struct fb_info *info, const struct fb_fillrect *region) {
+static void dlfb_fillrect(struct fb_info *info, const struct fb_fillrect *region)
+{
 
-	unsigned char red, green, blue ;
+	unsigned char red, green, blue;
 	struct dlfb_data *dev = info->par;
-	
+
 	memcpy(&red, &region->color, 1);
-	memcpy(&green, &region->color+1, 1);
-	memcpy(&blue, &region->color+2, 1);
-	draw_rect(dev, region->dx, region->dy, region->width, region->height, red, green, blue);
-	//printk("FILL RECT %d %d !!!\n", region->dx, region->dy);
-	
+	memcpy(&green, &region->color + 1, 1);
+	memcpy(&blue, &region->color + 2, 1);
+	draw_rect(dev, region->dx, region->dy, region->width, region->height,
+		  red, green, blue);
+	/* printk("FILL RECT %d %d !!!\n", region->dx, region->dy); */
+
 }
 
-static int dlfb_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg) {
+static int dlfb_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
+{
 
-	struct dlfb_data *dev = info->par;
-	struct dloarea *area ;
+	struct dlfb_data *dev_info = info->par;
+	struct dloarea *area = (struct dloarea *)arg;
 
 
-	area = (struct dloarea *) arg ;
+	if (cmd == 0xAA || cmd == 0xAB) {
 
-	if (area->x < 0)
-		area->x = 0 ;
 
-	if (area->x > info->var.xres)
-		area->x = info->var.xres ;
+		if (area->x < 0)
+			area->x = 0;
 
-	if (area->y < 0)
-		area->y = 0 ;
+		if (area->x > info->var.xres)
+			area->x = info->var.xres;
 
-	if (area->y > info->var.yres)
-		area->y = info->var.yres ;
+		if (area->y < 0)
+			area->y = 0;
 
-	//printk("REDRAW IOCTL %d %d %d %d\n", area->x, area->y, area->w, area->h);
+		if (area->y > info->var.yres)
+			area->y = info->var.yres;
+	}
+
+	if (cmd == 0xAA) {
+		image_blit(dev_info, area->x, area->y, area->w, area->h,
+			   info->screen_base);
+	}
+	if (cmd == 0xAC) {
+		copyfb(dev_info);
+		image_blit(dev_info, area->x, area->y, area->w, area->h,
+			   info->screen_base);
+		swapfb(dev_info);
+	}
+	else if (cmd == 0xAB) {
+
+		if (area->x2 < 0)
+                        area->x2 = 0;
+
+		if (area->y2 < 0)
+                        area->y2 = 0;
 
-	image_blit(dev, area->x, area->y, area->w, area->h, info->screen_base);
-	return 0 ;
+		copyarea(dev_info,
+			area->x2, area->y2, area->x, area->y, area->w, area->h);
+	}
+	return 0;
 }
 
+/* taken from vesafb */
+
+static int
+dlfb_setcolreg(unsigned regno, unsigned red, unsigned green,
+	       unsigned blue, unsigned transp, struct fb_info *info)
+{
+	int err = 0;
+
+	if (regno >= info->cmap.len)
+		return 1;
+
+	if (regno < 16) {
+		if (info->var.red.offset == 10) {
+			/* 1:5:5:5 */
+			((u32 *) (info->pseudo_palette))[regno] =
+			    ((red & 0xf800) >> 1) |
+			    ((green & 0xf800) >> 6) | ((blue & 0xf800) >> 11);
+		} else {
+			/* 0:5:6:5 */
+			((u32 *) (info->pseudo_palette))[regno] =
+			    ((red & 0xf800)) |
+			    ((green & 0xfc00) >> 5) | ((blue & 0xf800) >> 11);
+		}
+	}
 
-// taken from vesafb
+	return err;
+}
 
-static int dlfb_setcolreg(unsigned regno, unsigned red, unsigned green,
-                            unsigned blue, unsigned transp,
-                            struct fb_info *info)
+static int dlfb_release(struct fb_info *info, int user)
 {
-        int err = 0;
-
-        if (regno >= info->cmap.len)
-                return 1;
-
-        if (regno < 16) {
-                        if (info->var.red.offset == 10) {
-                                /* 1:5:5:5 */
-                                ((u32*) (info->pseudo_palette))[regno] =
-                                        ((red   & 0xf800) >>  1) |
-                                        ((green & 0xf800) >>  6) |
-                                        ((blue  & 0xf800) >> 11);
-                        } else {
-                                /* 0:5:6:5 */
-                                ((u32*) (info->pseudo_palette))[regno] =
-                                        ((red   & 0xf800)      ) |
-                                        ((green & 0xfc00) >>  5) |
-                                        ((blue  & 0xf800) >> 11);
-                        }
-        }
+	struct dlfb_data *dev_info = info->par;
+	image_blit(dev_info, 0, 0, info->var.xres, info->var.yres,
+		   info->screen_base);
+	return 0;
+}
+
+static int dlfb_blank(int blank_mode, struct fb_info *info)
+{
+	struct dlfb_data *dev_info = info->par;
+	char *bufptr = dev_info->buf;
 
-        return err;
+	bufptr = dlfb_set_register(bufptr, 0xFF, 0x00);
+	if (blank_mode != FB_BLANK_UNBLANK) {
+		bufptr = dlfb_set_register(bufptr, 0x1F, 0x01);
+	}
+	else {
+		bufptr = dlfb_set_register(bufptr, 0x1F, 0x00);
+	}
+	bufptr = dlfb_set_register(bufptr, 0xFF, 0xFF);
+
+	dlfb_bulk_msg(dev_info, bufptr - dev_info->buf);
+
+	return 0;
 }
 
 static struct fb_ops dlfb_ops = {
-
-	.fb_setcolreg   = dlfb_setcolreg,
+	.fb_setcolreg = dlfb_setcolreg,
 	.fb_fillrect = dlfb_fillrect,
 	.fb_copyarea = dlfb_copyarea,
 	.fb_imageblit = dlfb_imageblit,
-	.fb_mmap        = dlfb_mmap,
-	.fb_ioctl	= dlfb_ioctl,
+	.fb_mmap = dlfb_mmap,
+	.fb_ioctl = dlfb_ioctl,
+	.fb_release = dlfb_release,
+	.fb_blank = dlfb_blank,
 };
 
-static int dlfb_probe(struct usb_interface *interface, const struct usb_device_id *id)
+static int
+dlfb_probe(struct usb_interface *interface, const struct usb_device_id *id)
 {
-	struct dlfb_data *dev_info ;
+	struct dlfb_data *dev_info;
 	struct fb_info *info;
-	int i ;
-
-	int ret ;
-	char rbuf[4] ;
-
+	int i;
 
+	int ret;
+	char rbuf[4];
 
 	dev_info = kzalloc(sizeof(*dev_info), GFP_KERNEL);
 	if (dev_info == NULL) {
@@ -493,36 +725,47 @@ static int dlfb_probe(struct usb_interface *interface, const struct usb_device_i
 		return -ENOMEM;
 	}
 
-	mutex_init(&dev_info->bulk_mutex); 
+	mutex_init(&dev_info->bulk_mutex);
 
 	dev_info->udev = usb_get_dev(interface_to_usbdev(interface));
-        dev_info->interface = interface;
-	
+	dev_info->interface = interface;
+
 	printk("DisplayLink device attached\n");
 
-	// add framebuffer info to usb interface 
-	usb_set_intfdata (interface, dev_info);
+	/* add framebuffer info to usb interface */
+	usb_set_intfdata(interface, dev_info);
 
-	
-	dev_info->buf = kmalloc(BUF_SIZE , GFP_KERNEL); //usb_buffer_alloc(dev_info->udev, BUF_SIZE , GFP_KERNEL, &dev_info->tx_urb->transfer_dma);
+	dev_info->buf = kmalloc(BUF_SIZE, GFP_KERNEL);
+	/* usb_buffer_alloc(dev_info->udev, BUF_SIZE , GFP_KERNEL, &dev_info->tx_urb->transfer_dma); */
 
 	if (dev_info->buf == NULL) {
 		printk("unable to allocate memory for dlfb commands\n");
 		goto out;
 	}
-	dev_info->bufend = dev_info->buf + BUF_SIZE ;
-
-
-	ret = usb_control_msg(dev_info->udev, usb_rcvctrlpipe(dev_info->udev, 0), (0x06), (0x80 | (0x02 << 5)), 0, 0, rbuf, 4, 0) ;
-	printk("ret control msg 0: %d %x%x%x%x\n", ret, rbuf[0], rbuf[1], rbuf[2], rbuf[3]);
-
-	for(i=0;i<128;i++) {
-		ret = usb_control_msg(dev_info->udev, usb_rcvctrlpipe(dev_info->udev, 0), (0x02), (0x80 | (0x02 << 5)), i << 8, 0xA1, rbuf, 2, 0) ;
-		//printk("ret control msg edid %d: %d [%d]\n",i, ret, rbuf[1]);
+	dev_info->bufend = dev_info->buf + BUF_SIZE;
+
+	dev_info->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
+	usb_fill_bulk_urb(dev_info->tx_urb, dev_info->udev,
+			  usb_sndbulkpipe(dev_info->udev, 1), dev_info->buf, 0,
+			  dlfb_bulk_callback, dev_info);
+
+	ret =
+	    usb_control_msg(dev_info->udev, usb_rcvctrlpipe(dev_info->udev, 0),
+			    (0x06), (0x80 | (0x02 << 5)), 0, 0, rbuf, 4, 0);
+	printk("ret control msg 0: %d %x%x%x%x\n", ret, rbuf[0], rbuf[1],
+	       rbuf[2], rbuf[3]);
+
+	for (i = 0; i < 128; i++) {
+		ret =
+		    usb_control_msg(dev_info->udev,
+				    usb_rcvctrlpipe(dev_info->udev, 0), (0x02),
+				    (0x80 | (0x02 << 5)), i << 8, 0xA1, rbuf, 2,
+				    0);
+		/* printk("ret control msg edid %d: %d [%d]\n",i, ret, rbuf[1]); */
 		dev_info->edid[i] = rbuf[1];
 	}
 
-	info = framebuffer_alloc( sizeof(u32) *256, &dev_info->udev->dev);
+	info = framebuffer_alloc(sizeof(u32) * 256, &dev_info->udev->dev);
 
 	if (!info) {
 		printk("non posso allocare il framebuffer displaylink");
@@ -533,111 +776,125 @@ static int dlfb_probe(struct usb_interface *interface, const struct usb_device_i
 
 	printk("EDID XRES %d YRES %d\n", info->var.xres, info->var.yres);
 
-	if (dlfb_set_video_mode(dev_info, info->var.xres, info->var.yres) != 0) {
+	if (dlfb_set_video_mode(dev_info, info->var.xres, info->var.yres) != 0)
 		goto out;
-	}
 
-	printk("found valid mode...\n");
-	
+	printk("found valid mode...%d\n", info->var.pixclock);
+
 	info->pseudo_palette = info->par;
-	info->par = dev_info ;
+	info->par = dev_info;
 
-	dev_info->info = info ;
+	dev_info->info = info;
 
-	info->flags = FBINFO_DEFAULT | FBINFO_READS_FAST | FBINFO_HWACCEL_IMAGEBLIT | FBINFO_HWACCEL_COPYAREA | FBINFO_HWACCEL_FILLRECT  ;
+	info->flags =
+	    FBINFO_DEFAULT | FBINFO_READS_FAST | FBINFO_HWACCEL_IMAGEBLIT |
+	    FBINFO_HWACCEL_COPYAREA | FBINFO_HWACCEL_FILLRECT;
 	info->fbops = &dlfb_ops;
 	info->screen_base = rvmalloc(dev_info->screen_size);
 
 	if (info->screen_base == NULL) {
-		printk("cannot allocate framebuffer virtual memory of %d bytes\n", dev_info->screen_size);
-		goto out0 ;
+		printk
+		    ("cannot allocate framebuffer virtual memory of %d bytes\n",
+		     dev_info->screen_size);
+		goto out0;
 	}
 
 	printk("screen base allocated !!!\n");
-	//info->var = dev_info->si;
+
+	dev_info->backing_buffer = kzalloc(dev_info->screen_size, GFP_KERNEL);
+
+	if (!dev_info->backing_buffer)
+		printk("non posso allocare il backing buffer\n");
+
+	/* info->var = dev_info->si; */
 
 	info->var.bits_per_pixel = 16;
-	info->var.activate =     FB_ACTIVATE_TEST ;
-	info->var.vmode =        FB_VMODE_NONINTERLACED;
-	
-	info->var.red.offset =  11 ;
-	info->var.red.length =  5 ;
-	info->var.red.msb_right =  0 ;
-
-	info->var.green.offset =  5 ;
-	info->var.green.length =  6 ;
-	info->var.green.msb_right =  0 ;
-
-	info->var.blue.offset =  0 ;
-	info->var.blue.length =  5 ;
-	info->var.blue.msb_right =  0 ;
-
-	//info->var.pixclock =  (10000000 / FB_W * 1000 / FB_H)/2 ;
-
-	info->fix.smem_start = (unsigned long) info->screen_base;
-	info->fix.smem_len = PAGE_ALIGN (dev_info->screen_size) ;
-	memcpy(info->fix.id,"DisplayLink FB",14);
-	info->fix.type = FB_TYPE_PACKED_PIXELS ;
-	info->fix.visual = FB_VISUAL_TRUECOLOR ;	
-	info->fix.accel = info->flags ; 
-	info->fix.line_length = dev_info->line_length ;
-
-	if (fb_alloc_cmap(&info->cmap, 256, 0)<0) {
-		goto out1 ;
-	}
+	info->var.activate = FB_ACTIVATE_TEST;
+	info->var.vmode = FB_VMODE_NONINTERLACED;
+
+	info->var.red.offset = 11;
+	info->var.red.length = 5;
+	info->var.red.msb_right = 0;
+
+	info->var.green.offset = 5;
+	info->var.green.length = 6;
+	info->var.green.msb_right = 0;
+
+	info->var.blue.offset = 0;
+	info->var.blue.length = 5;
+	info->var.blue.msb_right = 0;
+
+	/* info->var.pixclock =  (10000000 / FB_W * 1000 / FB_H)/2 ; */
+
+	info->fix.smem_start = (unsigned long)info->screen_base;
+	info->fix.smem_len = PAGE_ALIGN(dev_info->screen_size);
+	memcpy(info->fix.id, "DisplayLink FB", 14);
+	info->fix.type = FB_TYPE_PACKED_PIXELS;
+	info->fix.visual = FB_VISUAL_TRUECOLOR;
+	info->fix.accel = info->flags;
+	info->fix.line_length = dev_info->line_length;
+
+	if (fb_alloc_cmap(&info->cmap, 256, 0) < 0)
+		goto out1;
 
 	printk("colormap allocated\n");
-	if (register_framebuffer(info) < 0){
+	if (register_framebuffer(info) < 0)
 		goto out2;
-	}
 
-	draw_rect(dev_info, 0, 0, dev_info->info->var.xres, dev_info->info->var.yres, 0x30, 0xff, 0x30) ;
+	draw_rect(dev_info, 0, 0, dev_info->info->var.xres,
+		  dev_info->info->var.yres, 0x30, 0xff, 0x30);
 
-	return 0 ;
+	return 0;
 
-out2:
+ out2:
 	fb_dealloc_cmap(&info->cmap);
-out1:
+ out1:
 	rvfree(info->screen_base, dev_info->screen_size);
-out0:
+ out0:
 	framebuffer_release(info);
-out:
-	usb_set_intfdata (interface, NULL);
+ out:
+	usb_set_intfdata(interface, NULL);
 	usb_put_dev(dev_info->udev);
 	kfree(dev_info);
 	return -ENOMEM;
-	
+
 }
 
 static void dlfb_disconnect(struct usb_interface *interface)
 {
-	struct dlfb_data *dev_info = usb_get_intfdata (interface);
+	struct dlfb_data *dev_info = usb_get_intfdata(interface);
+
+	mutex_unlock(&dev_info->bulk_mutex);
+
+	usb_kill_urb(dev_info->tx_urb);
+	usb_free_urb(dev_info->tx_urb);
+	usb_set_intfdata(interface, NULL);
+	usb_put_dev(dev_info->udev);
 
 	if (dev_info->info) {
 		unregister_framebuffer(dev_info->info);
 		fb_dealloc_cmap(&dev_info->info->cmap);
 		rvfree(dev_info->info->screen_base, dev_info->screen_size);
+		kfree(dev_info->backing_buffer);
 		framebuffer_release(dev_info->info);
+
 	}
 
-	usb_set_intfdata(interface, NULL);
-	usb_put_dev(dev_info->udev);
 	kfree(dev_info);
 
 	printk("DisplayLink device disconnected\n");
 }
 
 static struct usb_driver dlfb_driver = {
-	.name =		"udlfb",
-	.probe =	dlfb_probe,
-	.disconnect =	dlfb_disconnect,
-	.id_table =	id_table,
+	.name = "udlfb",
+	.probe = dlfb_probe,
+	.disconnect = dlfb_disconnect,
+	.id_table = id_table,
 };
 
 static int __init dlfb_init(void)
 {
 	int res;
-	
 
 	dlfb_init_modes();
 
@@ -650,7 +907,6 @@ static int __init dlfb_init(void)
 	return res;
 }
 
-
 static void __exit dlfb_exit(void)
 {
 	usb_deregister(&dlfb_driver);
diff --git a/recipes/libdlo/kernel-module-udlfb/udlfb.h b/recipes/libdlo/kernel-module-udlfb/udlfb.h
new file mode 100644
index 0000000000..f0508628f0
--- /dev/null
+++ b/recipes/libdlo/kernel-module-udlfb/udlfb.h
@@ -0,0 +1,213 @@
+#define MAX_VMODES 4
+#define FB_BPP 16
+
+#define STD_CHANNEL        "\x57\xCD\xDC\xA7\x1C\x88\x5E\x15\x60\xFE\xC6\x97\x16\x3D\x47\xF2"
+
+// as libdlo
+#define BUF_HIGH_WATER_MARK 1024
+#define BUF_SIZE 64*1024
+
+struct dlfb_data {
+	struct usb_device *udev;
+	struct usb_interface *interface;
+	struct urb *tx_urb, *ctrl_urb;
+	struct usb_ctrlrequest dr;
+	struct fb_info *info;
+	char *buf;
+	char *bufend;
+	char *backing_buffer;
+	struct mutex bulk_mutex;
+	char edid[128];
+	int screen_size;
+	int line_length;
+	struct completion done;
+	int base16;
+	int base16d;
+	int base8;
+	int base8d;
+};
+
+struct dlfb_video_mode {
+
+	uint8_t col;
+	uint32_t hclock;
+	uint32_t vclock;
+	uint8_t unknown1[6];
+	uint16_t xres;
+	uint8_t unknown2[6];
+	uint16_t yres;
+	uint8_t unknown3[4];
+
+} __attribute__ ((__packed__));
+
+struct dlfb_video_mode dlfb_video_modes[MAX_VMODES];
+
+static void dlfb_bulk_callback(struct urb *urb)
+{
+
+	struct dlfb_data *dev_info = urb->context;
+	complete(&dev_info->done);
+
+}
+
+static int dlfb_bulk_msg(struct dlfb_data *dev_info, int len)
+{
+
+	int ret;
+
+	init_completion(&dev_info->done);
+
+	dev_info->tx_urb->actual_length = 0;
+	dev_info->tx_urb->transfer_buffer_length = len;
+
+	ret = usb_submit_urb(dev_info->tx_urb, GFP_KERNEL);
+	if (!wait_for_completion_timeout(&dev_info->done, 1000)) {
+		usb_kill_urb(dev_info->tx_urb);
+		printk("usb timeout !!!\n");
+	}
+
+	return dev_info->tx_urb->actual_length;
+
+}
+
+void dlfb_init_modes(void)
+{
+
+	dlfb_video_modes[0].col = 0;
+	memcpy(&dlfb_video_modes[0].hclock, "\x20\x3C\x7A\xC9", 4);
+	memcpy(&dlfb_video_modes[0].vclock, "\xF2\x6C\x48\xF9", 4);
+	memcpy(&dlfb_video_modes[0].unknown1, "\x70\x53\xFF\xFF\x21\x27", 6);
+	dlfb_video_modes[0].xres = 800;
+	memcpy(&dlfb_video_modes[0].unknown2, "\x91\xF3\xFF\xFF\xFF\xF9", 6);
+	dlfb_video_modes[0].yres = 480;
+	memcpy(&dlfb_video_modes[0].unknown3, "\x01\x02\xC8\x19", 4);
+
+	dlfb_video_modes[1].col = 0;
+	memcpy(&dlfb_video_modes[1].hclock, "\x36\x18\xD5\x10", 4);
+	memcpy(&dlfb_video_modes[1].vclock, "\x60\xA9\x7B\x33", 4);
+	memcpy(&dlfb_video_modes[1].unknown1, "\xA1\x2B\x27\x32\xFF\xFF", 6);
+	dlfb_video_modes[1].xres = 1024;
+	memcpy(&dlfb_video_modes[1].unknown2, "\xD9\x9A\xFF\xCA\xFF\xFF", 6);
+	dlfb_video_modes[1].yres = 768;
+	memcpy(&dlfb_video_modes[1].unknown3, "\x04\x03\xC8\x32", 4);
+
+	dlfb_video_modes[2].col = 0;
+	memcpy(&dlfb_video_modes[2].hclock, "\x98\xF8\x0D\x57", 4);
+	memcpy(&dlfb_video_modes[2].vclock, "\x2A\x55\x4D\x54", 4);
+	memcpy(&dlfb_video_modes[2].unknown1, "\xCA\x0D\xFF\xFF\x94\x43", 6);
+	dlfb_video_modes[2].xres = 1280;
+	memcpy(&dlfb_video_modes[2].unknown2, "\x9A\xA8\xFF\xFF\xFF\xF9", 6);
+	dlfb_video_modes[2].yres = 1024;
+	memcpy(&dlfb_video_modes[2].unknown3, "\x04\x02\x60\x54", 4);
+
+	dlfb_video_modes[3].col = 0;
+	memcpy(&dlfb_video_modes[3].hclock, "\x42\x24\x38\x36", 4);
+	memcpy(&dlfb_video_modes[3].vclock, "\xC1\x52\xD9\x29", 4);
+	memcpy(&dlfb_video_modes[3].unknown1, "\xEA\xB8\x32\x60\xFF\xFF", 6);
+	dlfb_video_modes[3].xres = 1400;
+	memcpy(&dlfb_video_modes[3].unknown2, "\xC9\x4E\xFF\xFF\xFF\xF2", 6);
+	dlfb_video_modes[3].yres = 1050;
+	memcpy(&dlfb_video_modes[3].unknown3, "\x04\x02\x1E\x5F", 4);
+
+}
+
+char *dlfb_set_register(char *bufptr, uint8_t reg, uint8_t val)
+{
+
+	*bufptr++ = 0xAF;
+	*bufptr++ = 0x20;
+	*bufptr++ = reg;
+	*bufptr++ = val;
+
+	return bufptr;
+
+}
+
+int dlfb_set_video_mode(struct dlfb_data *dev_info, int width, int height)
+{
+
+	int i, ret;
+	unsigned char j;
+	char *bufptr = dev_info->buf;
+	uint8_t *vdata;
+
+	for (i = 0; i < MAX_VMODES; i++) {
+		printk("INIT VIDEO %d %d %d\n", i, dlfb_video_modes[i].xres,
+		       dlfb_video_modes[i].yres);
+		if (dlfb_video_modes[i].xres == width
+		    && dlfb_video_modes[i].yres == height) {
+
+			dev_info->base16 = 0;
+			dev_info->base16d = width * height * (FB_BPP / 8) ;
+
+			//dev_info->base8 = width * height * (FB_BPP / 8);
+
+			dev_info->base8 = dev_info->base16;
+			dev_info->base8d = dev_info->base16d;
+
+			// set encryption key (null)
+			memcpy(dev_info->buf, STD_CHANNEL, 16);
+			ret =
+			    usb_control_msg(dev_info->udev,
+					    usb_sndctrlpipe(dev_info->udev, 0),
+					    0x12, (0x02 << 5), 0, 0,
+					    dev_info->buf, 16, 0);
+			printk("ret control msg 1 (STD_CHANNEL): %d\n", ret);
+
+			// set registers
+			bufptr = dlfb_set_register(bufptr, 0xFF, 0x00);
+
+			// set color depth
+			bufptr = dlfb_set_register(bufptr, 0x00, 0x00);
+
+			// set addresses
+			bufptr =
+			    dlfb_set_register(bufptr, 0x20,
+					      (char)(dev_info->base16 >> 16));
+			bufptr =
+			    dlfb_set_register(bufptr, 0x21,
+					      (char)(dev_info->base16 >> 8));
+			bufptr =
+			    dlfb_set_register(bufptr, 0x22,
+					      (char)(dev_info->base16));
+
+			bufptr =
+			    dlfb_set_register(bufptr, 0x26,
+					      (char)(dev_info->base8 >> 16));
+			bufptr =
+			    dlfb_set_register(bufptr, 0x27,
+					      (char)(dev_info->base8 >> 8));
+			bufptr =
+			    dlfb_set_register(bufptr, 0x28,
+					      (char)(dev_info->base8));
+
+			// set video mode
+			vdata = (uint8_t *) & dlfb_video_modes[i];
+			for (j = 0; j < 29; j++) {
+				bufptr = dlfb_set_register(bufptr, j, vdata[j]);
+			}
+
+			// blank
+			bufptr = dlfb_set_register(bufptr, 0x1F, 0x00);
+
+			// end registers
+			bufptr = dlfb_set_register(bufptr, 0xFF, 0xFF);
+
+			// send
+			ret = dlfb_bulk_msg(dev_info, bufptr - dev_info->buf);
+			printk("ret bulk 2: %d %d\n", ret,
+			       bufptr - dev_info->buf);
+
+			// flush
+			ret = dlfb_bulk_msg(dev_info, 0);
+			printk("ret bulk 3: %d\n", ret);
+
+			dev_info->screen_size = width * height * (FB_BPP / 8);
+			dev_info->line_length = width * (FB_BPP / 8);
+
+			return 0;
+		}
+	}
+
+	return -1;
+}