displaylink: add kernel-module-udlfb and libdlo, which are 2 ways of controlling displaylink based usb devices

3 files changed, 913 insertions, 0 deletions

diff --git a/recipes/libdlo/kernel-module-udlfb/Makefile b/recipes/libdlo/kernel-module-udlfb/Makefile
new file mode 100644
index 0000000000..255d3f5480
--- /dev/null
+++ b/recipes/libdlo/kernel-module-udlfb/Makefile
@@ -0,0 +1,15 @@
+ifndef KERNELRELEASE
+
+PWD := $(shell pwd)
+all:
+	$(MAKE) -C $(KERNELDIR) SUBDIRS=$(PWD) modules
+clean:
+	rm -f *.o *.ko *.mod.* .*.cmd Module.symvers
+	rm -rf .tmp_versions
+
+install:
+	$(MAKE) -C $(KERNELDIR) SUBDIRS=$(PWD) modules_install
+
+else
+     obj-m := udlfb.o
+endif
diff --git a/recipes/libdlo/kernel-module-udlfb/dlfb.h b/recipes/libdlo/kernel-module-udlfb/dlfb.h
new file mode 100644
index 0000000000..fdc33ca1c4
--- /dev/null
+++ b/recipes/libdlo/kernel-module-udlfb/dlfb.h
@@ -0,0 +1,234 @@
+#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
new file mode 100644
index 0000000000..32f2b30134
--- /dev/null
+++ b/recipes/libdlo/kernel-module-udlfb/udlfb.c
@@ -0,0 +1,664 @@
+/*****************************************************************************
+ *                          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                                      *
+ *****************************************************************************/
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/usb.h>
+#include <linux/uaccess.h>
+#include <linux/mm.h>
+#include <linux/fb.h>
+#include <linux/mutex.h>
+#include <linux/vmalloc.h>
+
+#include "dlfb.h"
+
+
+#define DRIVER_VERSION "DLFB 0.2rc2"
+
+
+// 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;
+        }
+
+        return mem;
+}
+
+static void rvfree(void *mem, unsigned long size)
+{
+        unsigned long adr;
+
+        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);
+}
+
+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;
+
+	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;
+
+        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
+struct dloarea {
+        int x,y;
+        int w,h;
+};
+
+/*
+
+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, },
+        { },
+};
+
+
+
+MODULE_DEVICE_TABLE (usb, id_table);
+
+static struct usb_driver dlfb_driver;
+
+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 ;
+
+	if (x+width > dev_info->info->var.xres) {
+		return -EINVAL;
+	}
+
+	if (y+height > dev_info->info->var.yres) {
+		return -EINVAL;
+	}
+
+
+	base = (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 ;
+
+        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 ;
+		}
+
+                rem = width ;
+
+		//printk("WRITING LINE %d\n", i);
+
+                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;
+				}
+                                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 ;
+                        }
+
+                }
+
+                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);
+	}
+
+        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) {
+
+	int i,base ;
+	int ret  ;
+	unsigned short col = (((((red) & 0xF8) | ((green) >> 5)) & 0xFF) << 8) + (((((green) & 0x1C) << 3) | ((blue) >> 3)) & 0xFF) ;
+	int rem = width ;
+
+	char *bufptr ;
+
+	if (x+width > dev_info->info->var.xres) {
+		return -EINVAL;
+	}
+
+	if (y+height > dev_info->info->var.yres) {
+		return -EINVAL;
+	}
+
+	base = (dev_info->info->var.xres*2*y)+(x*2) ;
+
+	bufptr = dev_info->buf ;
+
+	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 ;
+                }
+
+		rem = width ;
+
+		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++ = 0x69 ;
+
+			*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++ = (char) (col >> 8) ;
+			*bufptr++ = (char) (col) ;
+
+		}
+
+		base+= (dev_info->info->var.xres*2)-(width*2) ;
+		
+	}
+
+	if (bufptr > dev_info->buf) {
+                ret = dlfb_bulk_msg(dev_info, bufptr-dev_info->buf);
+        }
+
+	return 1 ;
+}
+
+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 ;
+
+	if (dx+width > dev_info->info->var.xres) {
+		return -EINVAL;
+	}
+
+	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) ;
+
+	bufptr = dev_info->buf ;
+
+	for(i = sy;i<sy+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 ;
+                }
+
+		rem = width ;
+
+		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 ;
+                        }
+			
+		}
+
+		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);
+        }
+
+	
+	return 1;
+}
+
+void dlfb_copyarea(struct fb_info *info, const struct fb_copyarea *area) {
+
+        struct dlfb_data *dev = info->par;
+
+	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);
+
+}
+
+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);
+	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);
+}
+
+void dlfb_fillrect(struct fb_info *info, const struct fb_fillrect *region) {
+
+	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);
+	
+}
+
+static int dlfb_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg) {
+
+	struct dlfb_data *dev = info->par;
+	struct dloarea *area ;
+
+
+	area = (struct dloarea *) arg ;
+
+	if (area->x < 0)
+		area->x = 0 ;
+
+	if (area->x > info->var.xres)
+		area->x = info->var.xres ;
+
+	if (area->y < 0)
+		area->y = 0 ;
+
+	if (area->y > info->var.yres)
+		area->y = info->var.yres ;
+
+	//printk("REDRAW IOCTL %d %d %d %d\n", area->x, area->y, area->w, area->h);
+
+	image_blit(dev, area->x, area->y, area->w, area->h, info->screen_base);
+	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);
+                        }
+        }
+
+        return err;
+}
+
+static struct fb_ops dlfb_ops = {
+
+	.fb_setcolreg   = dlfb_setcolreg,
+	.fb_fillrect = dlfb_fillrect,
+	.fb_copyarea = dlfb_copyarea,
+	.fb_imageblit = dlfb_imageblit,
+	.fb_mmap        = dlfb_mmap,
+	.fb_ioctl	= dlfb_ioctl,
+};
+
+static int dlfb_probe(struct usb_interface *interface, const struct usb_device_id *id)
+{
+	struct dlfb_data *dev_info ;
+	struct fb_info *info;
+	int i ;
+
+	int ret ;
+	char rbuf[4] ;
+
+
+
+	dev_info = kzalloc(sizeof(*dev_info), GFP_KERNEL);
+	if (dev_info == NULL) {
+		printk("cannot allocate dev_info structure.\n");
+		return -ENOMEM;
+	}
+
+	mutex_init(&dev_info->bulk_mutex); 
+
+	dev_info->udev = usb_get_dev(interface_to_usbdev(interface));
+        dev_info->interface = interface;
+	
+	printk("DisplayLink device attached\n");
+
+	// 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);
+
+	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->edid[i] = rbuf[1];
+	}
+
+	info = framebuffer_alloc( sizeof(u32) *256, &dev_info->udev->dev);
+
+	if (!info) {
+		printk("non posso allocare il framebuffer displaylink");
+		goto out;
+	}
+
+	fb_parse_edid(dev_info->edid, &info->var);
+
+	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) {
+		goto out;
+	}
+
+	printk("found valid mode...\n");
+	
+	info->pseudo_palette = info->par;
+	info->par = dev_info ;
+
+	dev_info->info = info ;
+
+	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("screen base allocated !!!\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 ;
+	}
+
+	printk("colormap allocated\n");
+	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) ;
+
+	return 0 ;
+
+out2:
+	fb_dealloc_cmap(&info->cmap);
+out1:
+	rvfree(info->screen_base, dev_info->screen_size);
+out0:
+	framebuffer_release(info);
+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);
+
+	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);
+		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,
+};
+
+static int __init dlfb_init(void)
+{
+	int res;
+	
+
+	dlfb_init_modes();
+
+	res = usb_register(&dlfb_driver);
+	if (res)
+		err("usb_register failed. Error number %d", res);
+
+	printk("VMODES initialized\n");
+
+	return res;
+}
+
+
+static void __exit dlfb_exit(void)
+{
+	usb_deregister(&dlfb_driver);
+}
+
+module_init(dlfb_init);
+module_exit(dlfb_exit);
+
+MODULE_AUTHOR("Roberto De Ioris <roberto@unbit.it>");
+MODULE_DESCRIPTION(DRIVER_VERSION);
+MODULE_LICENSE("GPL");