diff --git a/drivers/media/video/usbvision/usbvision-core.c b/drivers/media/video/usbvision/usbvision-core.c
index e660a91..9163b60 100644
--- a/drivers/media/video/usbvision/usbvision-core.c
+++ b/drivers/media/video/usbvision/usbvision-core.c
@@ -87,6 +87,7 @@
 #define DBG_ISOC	1<<2
 #define DBG_PARSE	1<<3
 #define DBG_SCRATCH	1<<4
+#define DBG_FUNC	1<<5
 
 static const int max_imgwidth = MAX_FRAME_WIDTH;
 static const int max_imgheight = MAX_FRAME_HEIGHT;
diff --git a/drivers/media/video/usbvision/usbvision-video.c b/drivers/media/video/usbvision/usbvision-video.c
index 3f3839b..864446c 100644
--- a/drivers/media/video/usbvision/usbvision-video.c
+++ b/drivers/media/video/usbvision/usbvision-video.c
@@ -92,8 +92,6 @@
 #define	ENABLE_HEXDUMP	0	/* Enable if you need it */
 
 
-#define USBVISION_DEBUG		/* Turn on debug messages */
-
 #ifdef USBVISION_DEBUG
 	#define PDEBUG(level, fmt, args...) \
 		if (video_debug & (level)) info("[%s:%d] " fmt, __PRETTY_FUNCTION__, __LINE__ , ## args)
@@ -104,7 +102,7 @@
 #define DBG_IOCTL	1<<0
 #define DBG_IO		1<<1
 #define DBG_PROBE	1<<2
-#define DBG_FUNC	1<<3
+#define DBG_MMAP	1<<3
 
 //String operations
 #define rmspace(str)	while(*str==' ') str++;
@@ -821,7 +819,7 @@
 
 			vb->memory = V4L2_MEMORY_MMAP;
 			vb->field = V4L2_FIELD_NONE;
-			vb->length = usbvision->max_frame_size;
+			vb->length = usbvision->curwidth*usbvision->curheight*usbvision->palette.bytes_per_pixel;
 			vb->timestamp = usbvision->frame[vb->index].timestamp;
 			vb->sequence = usbvision->frame[vb->index].sequence;
 			return 0;
@@ -959,13 +957,14 @@
 					vf->fmt.pix.sizeimage = vf->fmt.pix.bytesperline*usbvision->curheight;
 					vf->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
 					vf->fmt.pix.field = V4L2_FIELD_NONE; /* Always progressive image */
+					PDEBUG(DBG_IOCTL, "VIDIOC_G_FMT w=%d, h=%d, format=%s",
+					       vf->fmt.pix.width, vf->fmt.pix.height,usbvision->palette.desc);
+					return 0;
 				}
-				return 0;
 				default:
 					PDEBUG(DBG_IOCTL, "VIDIOC_G_FMT invalid type %d",vf->type);
 					return -EINVAL;
 			}
-			PDEBUG(DBG_IOCTL, "VIDIOC_G_FMT w=%d, h=%d",vf->fmt.win.w.width, vf->fmt.win.w.height);
 			return 0;
 		}
 		case VIDIOC_TRY_FMT:
@@ -991,6 +990,15 @@
 					RESTRICT_TO_RANGE(vf->fmt.pix.width, MIN_FRAME_WIDTH, MAX_FRAME_WIDTH);
 					RESTRICT_TO_RANGE(vf->fmt.pix.height, MIN_FRAME_HEIGHT, MAX_FRAME_HEIGHT);
 
+					vf->fmt.pix.bytesperline = vf->fmt.pix.width*usbvision->palette.bytes_per_pixel;
+					vf->fmt.pix.sizeimage = vf->fmt.pix.bytesperline*vf->fmt.pix.height;
+
+					if(cmd == VIDIOC_TRY_FMT) {
+						PDEBUG(DBG_IOCTL, "VIDIOC_TRY_FMT grabdisplay w=%d, h=%d, format=%s",
+					       vf->fmt.pix.width, vf->fmt.pix.height,usbvision->palette.desc);
+						return 0;
+					}
+
 					/* stop io in case it is already in progress */
 					if(usbvision->streaming == Stream_On) {
 						if ((ret = usbvision_stream_interrupt(usbvision)))
@@ -1133,7 +1141,7 @@
 	}
 
 	if (!(vma->vm_flags & VM_WRITE) ||
-	    size != PAGE_ALIGN(usbvision->max_frame_size)) {
+	    size != PAGE_ALIGN(usbvision->curwidth*usbvision->curheight*usbvision->palette.bytes_per_pixel)) {
 		up(&usbvision->lock);
 		return -EINVAL;
 	}
@@ -1143,7 +1151,7 @@
 			break;
 	}
 	if (i == USBVISION_NUMFRAMES) {
-		PDEBUG(DBG_FUNC, "mmap: user supplied mapping address is out of range");
+		PDEBUG(DBG_MMAP, "mmap: user supplied mapping address is out of range");
 		up(&usbvision->lock);
 		return -EINVAL;
 	}
@@ -1156,7 +1164,7 @@
 	while (size > 0) {
 
 		if (vm_insert_page(vma, start, vmalloc_to_page(pos))) {
-			PDEBUG(DBG_FUNC, "mmap: vm_insert_page failed");
+			PDEBUG(DBG_MMAP, "mmap: vm_insert_page failed");
 			up(&usbvision->lock);
 			return -EAGAIN;
 		}
@@ -2003,7 +2011,7 @@
 	PDEBUG(DBG_IOCTL, "IOCTL   debugging is enabled [video]");
 	PDEBUG(DBG_IO,  "IO      debugging is enabled [video]");
 	PDEBUG(DBG_PROBE, "PROBE   debugging is enabled [video]");
-	PDEBUG(DBG_FUNC, "FUNC    debugging is enabled [video]");
+	PDEBUG(DBG_MMAP, "MMAP    debugging is enabled [video]");
 
 	/* disable planar mode support unless compression enabled */
 	if (isocMode != ISOC_MODE_COMPRESS ) {
diff --git a/drivers/media/video/usbvision/usbvision.h b/drivers/media/video/usbvision/usbvision.h
index f2eeda8..0e7e3d6 100644
--- a/drivers/media/video/usbvision/usbvision.h
+++ b/drivers/media/video/usbvision/usbvision.h
@@ -3,9 +3,14 @@
  *  usbvision header file
  *
  * Copyright (c) 1999-2005 Joerg Heckenbach <joerg@heckenbach-aw.de>
+ *                         Dwaine Garden <dwainegarden@rogers.com>
+ *
+ *
+ * Report problems to v4l MailingList : http://www.redhat.com/mailman/listinfo/video4linux-list
  *
  * This module is part of usbvision driver project.
  * Updates to driver completed by Dwaine P. Garden
+ * v4l2 conversion by Thierry Merle <thierry.merle@free.fr>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -32,6 +37,8 @@
 #include <media/tuner.h>
 #include <linux/videodev2.h>
 
+#define USBVISION_DEBUG		/* Turn on debug messages */
+
 #ifndef VID_HARDWARE_USBVISION
 	#define VID_HARDWARE_USBVISION 34   /* USBVision Video Grabber */
 #endif