V4L/DVB (3518): Creates a virtual video device driver

The Virtual Video Device Driver (aka vivi) is a device that
can be used to:
	1) test core v4l functionalities;
	2) be a prototype for newer development.
Vivi were developed using the best practices for v4l driver. 
When loaded, it provides a video device that generates a
standard color bar, with a timestamp placed at top left corner.

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 1453 insertions, 0 deletions

diff --git a/drivers/media/video/vivi.c b/drivers/media/video/vivi.c
new file mode 100644
index 000000000000..e2d941bae43e
--- /dev/null
+++ b/drivers/media/video/vivi.c
@@ -0,0 +1,1453 @@
+/*
+ * Virtual Video driver - This code emulates a real video device with v4l2 api
+ *
+ * Copyright (c) 2006 by:
+ *      Mauro Carvalho Chehab <mchehab--a.t--infradead.org>
+ *      Ted Walther <ted--a.t--enumera.com>
+ *      John Sokol <sokol--a.t--videotechnology.com>
+ *      http://v4l.videotechnology.com/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the BSD Licence, GNU General Public License
+ * as published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version
+ */
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/pci.h>
+#include <linux/random.h>
+#include <linux/version.h>
+#include <linux/videodev2.h>
+#include <media/video-buf.h>
+#include <media/v4l2-common.h>
+#include <linux/kthread.h>
+#include <linux/highmem.h>
+
+/* Wake up at about 30 fps */
+#define WAKE_NUMERATOR 30
+#define WAKE_DENOMINATOR 1001
+#define BUFFER_TIMEOUT     msecs_to_jiffies(500)  /* 0.5 seconds */
+
+/* These timers are for 1 fps - used only for testing */
+//#define WAKE_DENOMINATOR 30 /* hack for testing purposes */
+//#define BUFFER_TIMEOUT     msecs_to_jiffies(5000)  /* 5 seconds */
+
+#include "font.h"
+
+#ifndef kzalloc
+#define kzalloc(size, flags)                            \
+({                                                      \
+	void *__ret = kmalloc(size, flags);             \
+	if (__ret)                                      \
+		memset(__ret, 0, size);                 \
+	__ret;                                          \
+})
+#endif
+
+MODULE_DESCRIPTION("Video Technology Magazine Virtual Video Capture Board");
+MODULE_AUTHOR("Ted Walther and John Sokol");
+MODULE_LICENSE("Dual BSD/GPL");
+
+#define VIVI_MAJOR_VERSION 0
+#define VIVI_MINOR_VERSION 4
+#define VIVI_RELEASE 0
+#define VIVI_VERSION KERNEL_VERSION(VIVI_MAJOR_VERSION, VIVI_MINOR_VERSION, VIVI_RELEASE)
+
+static int video_nr = -1;        /* /dev/videoN, -1 for autodetect */
+module_param(video_nr, int, 0);
+
+static int debug = 0;
+module_param(debug, int, 0);
+
+static unsigned int vid_limit = 16;
+module_param(vid_limit,int,0644);
+MODULE_PARM_DESC(vid_limit,"capture memory limit in megabytes");
+
+/* supported controls */
+static struct v4l2_queryctrl vivi_qctrl[] = {
+	{
+		.id            = V4L2_CID_AUDIO_VOLUME,
+		.name          = "Volume",
+		.minimum       = 0,
+		.maximum       = 65535,
+		.step          = 65535/100,
+		.default_value = 65535,
+		.flags         = 0,
+		.type          = V4L2_CTRL_TYPE_INTEGER,
+	},{
+		.id            = V4L2_CID_BRIGHTNESS,
+		.type          = V4L2_CTRL_TYPE_INTEGER,
+		.name          = "Brightness",
+		.minimum       = 0,
+		.maximum       = 255,
+		.step          = 1,
+		.default_value = 127,
+		.flags         = 0,
+	}, {
+		.id            = V4L2_CID_CONTRAST,
+		.type          = V4L2_CTRL_TYPE_INTEGER,
+		.name          = "Contrast",
+		.minimum       = 0,
+		.maximum       = 255,
+		.step          = 0x1,
+		.default_value = 0x10,
+		.flags         = 0,
+	}, {
+		.id            = V4L2_CID_SATURATION,
+		.type          = V4L2_CTRL_TYPE_INTEGER,
+		.name          = "Saturation",
+		.minimum       = 0,
+		.maximum       = 255,
+		.step          = 0x1,
+		.default_value = 127,
+		.flags         = 0,
+	}, {
+		.id            = V4L2_CID_HUE,
+		.type          = V4L2_CTRL_TYPE_INTEGER,
+		.name          = "Hue",
+		.minimum       = -128,
+		.maximum       = 127,
+		.step          = 0x1,
+		.default_value = 0,
+		.flags         = 0,
+	}
+};
+
+static int qctl_regs[ARRAY_SIZE(vivi_qctrl)];
+
+#define dprintk(level,fmt, arg...)			     \
+	do { 						     \
+		if (debug >= (level))			     \
+			printk(KERN_DEBUG "vivi: " fmt , ## arg);    \
+	} while (0)
+
+/* ------------------------------------------------------------------
+	Basic structures
+   ------------------------------------------------------------------*/
+
+struct vivi_fmt {
+	char  *name;
+	u32   fourcc;          /* v4l2 format id */
+	int   depth;
+};
+
+static struct vivi_fmt format = {
+	.name     = "4:2:2, packed, YUYV",
+	.fourcc   = V4L2_PIX_FMT_YUYV,
+	.depth    = 16,
+};
+
+struct sg_to_addr {
+	int pos;
+	struct scatterlist *sg;
+};
+
+/* buffer for one video frame */
+struct vivi_buffer {
+	/* common v4l buffer stuff -- must be first */
+	struct videobuf_buffer vb;
+
+	struct vivi_fmt        *fmt;
+
+	struct sg_to_addr      *to_addr;
+};
+
+struct vivi_dmaqueue {
+	struct list_head       active;
+	struct list_head       queued;
+	struct timer_list      timeout;
+
+	/* thread for generating video stream*/
+	struct task_struct         *kthread;
+	wait_queue_head_t          wq;
+	/* Counters to control fps rate */
+	int                        frame;
+	int                        ini_jiffies;
+};
+
+static LIST_HEAD(vivi_devlist);
+
+struct vivi_dev {
+	struct list_head           vivi_devlist;
+
+	struct semaphore           lock;
+
+	int                        users;
+
+	/* various device info */
+	unsigned int               resources;
+	struct video_device        video_dev;
+
+	struct vivi_dmaqueue       vidq;
+
+	/* Several counters */
+	int                        h,m,s,us,jiffies;
+	char                       timestr[13];
+};
+
+struct vivi_fh {
+	struct vivi_dev            *dev;
+
+	/* video capture */
+	struct vivi_fmt            *fmt;
+	unsigned int               width,height;
+	struct videobuf_queue      vb_vidq;
+
+	enum v4l2_buf_type         type;
+};
+
+/* ------------------------------------------------------------------
+	DMA and thread functions
+   ------------------------------------------------------------------*/
+
+/* Bars and Colors should match positions */
+
+enum colors {
+	WHITE,
+	AMBAR,
+	CYAN,
+	GREEN,
+	MAGENTA,
+	RED,
+	BLUE
+};
+
+static u8 bars[8][3] = {
+	/* R   G   B */
+	{204,204,204},	/* white */
+	{208,208,  0},  /* ambar */
+	{  0,206,206},  /* cyan */
+	{  0,239,  0},  /* green */
+	{239,  0,239},  /* magenta */
+	{205,  0,  0},  /* red */
+	{  0,  0,255},  /* blue */
+	{  0,  0,  0}
+};
+
+#define TO_Y(r,g,b) (((16829*r +33039*g +6416*b  + 32768)>>16)+16)
+/* RGB to  V(Cr) Color transform */
+#define TO_V(r,g,b) (((28784*r -24103*g -4681*b  + 32768)>>16)+128)
+/* RGB to  U(Cb) Color transform */
+#define TO_U(r,g,b) (((-9714*r -19070*g +28784*b + 32768)>>16)+128)
+
+#define TSTAMP_MIN_Y 24
+#define TSTAMP_MAX_Y TSTAMP_MIN_Y+15
+#define TSTAMP_MIN_X 64
+
+void prep_to_addr(struct sg_to_addr to_addr[],struct videobuf_buffer *vb)
+{
+	int i, pos=0;
+
+	for (i=0;i<vb->dma.nr_pages;i++) {
+		to_addr[i].sg=&vb->dma.sglist[i];
+		to_addr[i].pos=pos;
+		pos += vb->dma.sglist[i].length;
+	}
+}
+
+inline int get_addr_pos(int pos, int pages, struct sg_to_addr to_addr[])
+{
+	int p1=0,p2=pages-1,p3=pages/2;
+
+	/* Sanity test */
+	BUG_ON (pos>=to_addr[p2].pos+to_addr[p2].sg->length);
+
+	while (p1+1<p2) {
+		if (pos < to_addr[p3].pos) {
+			p2=p3;
+		} else {
+			p1=p3;
+		}
+		p3=(p1+p2)/2;
+	}
+	if (pos >= to_addr[p2].pos)
+		p1=p2;
+
+	return (p1);
+}
+
+void gen_line(struct sg_to_addr to_addr[],int inipos,int pages,int wmax,
+					int hmax, int line, char *timestr)
+{
+	int  w,i,j,pos=inipos,pgpos,oldpg,y;
+	char *p,*s,*basep;
+	struct page *pg;
+	u8   chr,r,g,b,color;
+
+	/* Get first addr pointed to pixel position */
+	oldpg=get_addr_pos(pos,pages,to_addr);
+	pg=pfn_to_page(to_addr[oldpg].sg->dma_address >> PAGE_SHIFT);
+	basep = kmap_atomic(pg, KM_BOUNCE_READ)+to_addr[oldpg].sg->offset;
+
+	/* We will just duplicate the second pixel at the packet */
+	wmax/=2;
+
+	/* Generate a standard color bar pattern */
+	for (w=0;w<wmax;w++) {
+		r=bars[w*7/wmax][0];
+		g=bars[w*7/wmax][1];
+		b=bars[w*7/wmax][2];
+
+		for (color=0;color<4;color++) {
+			pgpos=get_addr_pos(pos,pages,to_addr);
+			if (pgpos!=oldpg) {
+				pg=pfn_to_page(to_addr[pgpos].sg->dma_address >> PAGE_SHIFT);
+				kunmap_atomic(basep, KM_BOUNCE_READ);
+				basep= kmap_atomic(pg, KM_BOUNCE_READ)+to_addr[pgpos].sg->offset;
+				oldpg=pgpos;
+			}
+			p=basep+pos-to_addr[pgpos].pos;
+
+			switch (color) {
+				case 0:
+				case 2:
+					*p=TO_Y(r,g,b);		/* Luminance */
+					break;
+				case 1:
+					*p=TO_U(r,g,b);		/* Cb */
+					break;
+				case 3:
+					*p=TO_V(r,g,b);		/* Cr */
+					break;
+			}
+			pos++;
+		}
+	}
+
+	/* Checks if it is possible to show timestamp */
+	if (TSTAMP_MAX_Y>=hmax)
+		goto end;
+	if (TSTAMP_MIN_X+strlen(timestr)>=wmax)
+		goto end;
+
+	/* Print stream time */
+	if (line>=TSTAMP_MIN_Y && line<=TSTAMP_MAX_Y) {
+		j=TSTAMP_MIN_X;
+		for (s=timestr;*s;s++) {
+			chr=rom8x16_bits[(*s-0x30)*16+line-TSTAMP_MIN_Y];
+			for (i=0;i<7;i++) {
+				if (chr&1<<(7-i)) { /* Font color*/
+					r=bars[BLUE][0];
+					g=bars[BLUE][1];
+					b=bars[BLUE][2];
+					r=g=b=0;
+					g=198;
+				} else { /* Background color */
+					r=bars[WHITE][0];
+					g=bars[WHITE][1];
+					b=bars[WHITE][2];
+					r=g=b=0;
+				}
+
+				pos=inipos+j*2;
+				for (color=0;color<4;color++) {
+					pgpos=get_addr_pos(pos,pages,to_addr);
+					if (pgpos!=oldpg) {
+						pg=pfn_to_page(to_addr[pgpos].
+								sg->dma_address
+								>> PAGE_SHIFT);
+						kunmap_atomic(basep,
+								KM_BOUNCE_READ);
+						basep= kmap_atomic(pg,
+							KM_BOUNCE_READ)+
+							to_addr[pgpos].sg->offset;
+						oldpg=pgpos;
+					}
+					p=basep+pos-to_addr[pgpos].pos;
+
+					y=TO_Y(r,g,b);
+
+					switch (color) {
+						case 0:
+						case 2:
+							*p=TO_Y(r,g,b);		/* Luminance */
+							break;
+						case 1:
+							*p=TO_U(r,g,b);		/* Cb */
+							break;
+						case 3:
+							*p=TO_V(r,g,b);		/* Cr */
+							break;
+					}
+					pos++;
+				}
+				j++;
+			}
+		}
+	}
+
+
+end:
+	kunmap_atomic(basep, KM_BOUNCE_READ);
+}
+static void vivi_fillbuff(struct vivi_dev *dev,struct vivi_buffer *buf)
+{
+	int h,pos=0;
+	int hmax  = buf->vb.height;
+	int wmax  = buf->vb.width;
+	struct videobuf_buffer *vb=&buf->vb;
+	struct sg_to_addr *to_addr=buf->to_addr;
+	struct timeval ts;
+
+	/* Test if DMA mapping is ready */
+	if (!vb->dma.sglist[0].dma_address)
+		return;
+
+	prep_to_addr(to_addr,vb);
+
+	/* Check if there is enough memory */
+	BUG_ON(buf->vb.dma.nr_pages << PAGE_SHIFT < (buf->vb.width*buf->vb.height)*2);
+
+	for (h=0;h<hmax;h++) {
+		gen_line(to_addr,pos,vb->dma.nr_pages,wmax,hmax,h,dev->timestr);
+		pos += wmax*2;
+	}
+
+	/* Updates stream time */
+
+	dev->us+=jiffies_to_usecs(jiffies-dev->jiffies);
+	dev->jiffies=jiffies;
+	if (dev->us>=1000000) {
+		dev->us-=1000000;
+		dev->s++;
+		if (dev->s>=60) {
+			dev->s-=60;
+			dev->m++;
+			if (dev->m>60) {
+				dev->m-=60;
+				dev->h++;
+				if (dev->h>24)
+					dev->h-=24;
+			}
+		}
+	}
+	sprintf(dev->timestr,"%02d:%02d:%02d:%03d",
+			dev->h,dev->m,dev->s,(dev->us+500)/1000);
+
+	dprintk(2,"vivifill at %s: Buffer 0x%08lx size= %d\n",dev->timestr,
+			(unsigned long)buf->vb.dma.vmalloc,pos);
+
+	/* Advice that buffer was filled */
+	buf->vb.state = STATE_DONE;
+	buf->vb.field_count++;
+	do_gettimeofday(&ts);
+	buf->vb.ts = ts;
+
+	list_del(&buf->vb.queue);
+	wake_up(&buf->vb.done);
+}
+
+static int restart_video_queue(struct vivi_dmaqueue *dma_q);
+
+static void vivi_thread_tick(struct vivi_dmaqueue  *dma_q)
+{
+	struct vivi_buffer    *buf;
+	struct vivi_dev *dev= container_of(dma_q,struct vivi_dev,vidq);
+
+	int bc;
+
+	/* Announces videobuf that all went ok */
+	for (bc = 0;; bc++) {
+		if (list_empty(&dma_q->active)) {
+			dprintk(1,"No active queue to serve\n");
+			break;
+		}
+
+		buf = list_entry(dma_q->active.next,
+				 struct vivi_buffer, vb.queue);
+
+		/* Nobody is waiting something to be done, just return */
+		if (!waitqueue_active(&buf->vb.done)) {
+			mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
+			return;
+		}
+
+		do_gettimeofday(&buf->vb.ts);
+		dprintk(2,"[%p/%d] wakeup\n",buf,buf->vb.i);
+
+		/* Fill buffer */
+		vivi_fillbuff(dev,buf);
+	}
+	if (list_empty(&dma_q->active)) {
+		del_timer(&dma_q->timeout);
+	} else {
+		mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
+	}
+	if (bc != 1)
+		dprintk(1,"%s: %d buffers handled (should be 1)\n",__FUNCTION__,bc);
+}
+
+void vivi_sleep(struct vivi_dmaqueue  *dma_q)
+{
+	int timeout;
+	DECLARE_WAITQUEUE(wait, current);
+
+	dprintk(1,"%s dma_q=0x%08lx\n",__FUNCTION__,(unsigned long)dma_q);
+
+	add_wait_queue(&dma_q->wq, &wait);
+	if (!kthread_should_stop()) {
+		dma_q->frame++;
+
+		/* Calculate time to wake up */
+		timeout=dma_q->ini_jiffies+msecs_to_jiffies((dma_q->frame*WAKE_NUMERATOR*1000)/WAKE_DENOMINATOR)-jiffies;
+
+		if (timeout <= 0) {
+			int old=dma_q->frame;
+			dma_q->frame=(jiffies_to_msecs(jiffies-dma_q->ini_jiffies)*WAKE_DENOMINATOR)/(WAKE_NUMERATOR*1000)+1;
+
+			timeout=dma_q->ini_jiffies+msecs_to_jiffies((dma_q->frame*WAKE_NUMERATOR*1000)/WAKE_DENOMINATOR)-jiffies;
+
+			dprintk(1,"underrun, losed %d frames. "
+				  "Now, frame is %d. Waking on %d jiffies\n",
+					dma_q->frame-old,dma_q->frame,timeout);
+		} else
+			dprintk(1,"will sleep for %i jiffies\n",timeout);
+
+		vivi_thread_tick(dma_q);
+
+		schedule_timeout_interruptible (timeout);
+	}
+
+	remove_wait_queue(&dma_q->wq, &wait);
+	try_to_freeze();
+}
+
+int vivi_thread(void *data)
+{
+	struct vivi_dmaqueue  *dma_q=data;
+
+	dprintk(1,"thread started\n");
+
+	for (;;) {
+		vivi_sleep(dma_q);
+
+		if (kthread_should_stop())
+			break;
+	}
+	dprintk(1, "thread: exit\n");
+	return 0;
+}
+
+int vivi_start_thread(struct vivi_dmaqueue  *dma_q)
+{
+	dma_q->frame=0;
+	dma_q->ini_jiffies=jiffies;
+
+	dprintk(1,"%s\n",__FUNCTION__);
+	init_waitqueue_head(&dma_q->wq);
+
+	dma_q->kthread = kthread_run(vivi_thread, dma_q, "vivi");
+
+	if (dma_q->kthread == NULL) {
+		printk(KERN_ERR "vivi: kernel_thread() failed\n");
+		return -EINVAL;
+	}
+	dprintk(1,"returning from %s\n",__FUNCTION__);
+	return 0;
+}
+
+void vivi_stop_thread(struct vivi_dmaqueue  *dma_q)
+{
+	dprintk(1,"%s\n",__FUNCTION__);
+	/* shutdown control thread */
+	if (dma_q->kthread) {
+		kthread_stop(dma_q->kthread);
+		dma_q->kthread=NULL;
+	}
+}
+
+static int restart_video_queue(struct vivi_dmaqueue *dma_q)
+{
+	struct vivi_buffer *buf, *prev;
+	struct list_head *item;
+
+	dprintk(1,"%s dma_q=0x%08lx\n",__FUNCTION__,(unsigned long)dma_q);
+
+	if (!list_empty(&dma_q->active)) {
+		buf = list_entry(dma_q->active.next, struct vivi_buffer, vb.queue);
+		dprintk(2,"restart_queue [%p/%d]: restart dma\n",
+			buf, buf->vb.i);
+
+		dprintk(1,"Restarting video dma\n");
+		vivi_stop_thread(dma_q);
+//		vivi_start_thread(dma_q);
+
+		/* cancel all outstanding capture / vbi requests */
+		list_for_each(item,&dma_q->active) {
+			buf = list_entry(item, struct vivi_buffer, vb.queue);
+
+			list_del(&buf->vb.queue);
+			buf->vb.state = STATE_ERROR;
+			wake_up(&buf->vb.done);
+		}
+		mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
+
+		return 0;
+	}
+
+	prev = NULL;
+	for (;;) {
+		if (list_empty(&dma_q->queued))
+			return 0;
+		buf = list_entry(dma_q->queued.next, struct vivi_buffer, vb.queue);
+		if (NULL == prev) {
+			list_del(&buf->vb.queue);
+			list_add_tail(&buf->vb.queue,&dma_q->active);
+
+			dprintk(1,"Restarting video dma\n");
+			vivi_stop_thread(dma_q);
+			vivi_start_thread(dma_q);
+
+			buf->vb.state = STATE_ACTIVE;
+			mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
+			dprintk(2,"[%p/%d] restart_queue - first active\n",
+				buf,buf->vb.i);
+
+		} else if (prev->vb.width  == buf->vb.width  &&
+			   prev->vb.height == buf->vb.height &&
+			   prev->fmt       == buf->fmt) {
+			list_del(&buf->vb.queue);
+			list_add_tail(&buf->vb.queue,&dma_q->active);
+			buf->vb.state = STATE_ACTIVE;
+			dprintk(2,"[%p/%d] restart_queue - move to active\n",
+				buf,buf->vb.i);
+		} else {
+			return 0;
+		}
+		prev = buf;
+	}
+}
+
+static void vivi_vid_timeout(unsigned long data)
+{
+	struct vivi_dev      *dev  = (struct vivi_dev*)data;
+	struct vivi_dmaqueue *vidq = &dev->vidq;
+	struct vivi_buffer   *buf;
+
+	while (!list_empty(&vidq->active)) {
+		buf = list_entry(vidq->active.next, struct vivi_buffer, vb.queue);
+		list_del(&buf->vb.queue);
+		buf->vb.state = STATE_ERROR;
+		wake_up(&buf->vb.done);
+		printk("vivi/0: [%p/%d] timeout\n", buf, buf->vb.i);
+	}
+
+	restart_video_queue(vidq);
+}
+
+/* ------------------------------------------------------------------
+	Videobuf operations
+   ------------------------------------------------------------------*/
+static int
+buffer_setup(struct videobuf_queue *vq, unsigned int *count, unsigned int *size)
+{
+	struct vivi_fh *fh = vq->priv_data;
+
+	*size = fh->width*fh->height*2;
+
+	if (0 == *count)
+		*count = 32;
+	while (*size * *count > vid_limit * 1024 * 1024)
+		(*count)--;
+	return 0;
+}
+
+void
+free_buffer(struct videobuf_queue *vq, struct vivi_buffer *buf)
+{
+	dprintk(1,"%s\n",__FUNCTION__);
+
+	if (in_interrupt())
+		BUG();
+
+	/*FIXME: Maybe a spinlock is required here */
+	kfree(buf->to_addr);
+	buf->to_addr=NULL;
+
+	videobuf_waiton(&buf->vb,0,0);
+	videobuf_dma_unmap(vq, &buf->vb.dma);
+	videobuf_dma_free(&buf->vb.dma);
+	buf->vb.state = STATE_NEEDS_INIT;
+}
+
+#define norm_maxw() 1024
+#define norm_maxh() 768
+static int
+buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
+						enum v4l2_field field)
+{
+	struct vivi_fh     *fh  = vq->priv_data;
+	struct vivi_buffer *buf = container_of(vb,struct vivi_buffer,vb);
+	int rc, init_buffer = 0;
+
+//	dprintk(1,"%s, field=%d\n",__FUNCTION__,field);
+
+	BUG_ON(NULL == fh->fmt);
+	if (fh->width  < 48 || fh->width  > norm_maxw() ||
+	    fh->height < 32 || fh->height > norm_maxh())
+		return -EINVAL;
+	buf->vb.size = fh->width*fh->height*2;
+	if (0 != buf->vb.baddr  &&  buf->vb.bsize < buf->vb.size)
+		return -EINVAL;
+
+	if (buf->fmt       != fh->fmt    ||
+	    buf->vb.width  != fh->width  ||
+	    buf->vb.height != fh->height ||
+	buf->vb.field  != field) {
+		buf->fmt       = fh->fmt;
+		buf->vb.width  = fh->width;
+		buf->vb.height = fh->height;
+		buf->vb.field  = field;
+		init_buffer = 1;
+	}
+
+	if (STATE_NEEDS_INIT == buf->vb.state) {
+		if (0 != (rc = videobuf_iolock(vq,&buf->vb,NULL)))
+			goto fail;
+	}
+
+	buf->vb.state = STATE_PREPARED;
+
+	if (NULL == (buf->to_addr = kmalloc(sizeof(*buf->to_addr) * vb->dma.nr_pages,GFP_KERNEL))) {
+		rc=-ENOMEM;
+		goto fail;
+	}
+
+	return 0;
+
+fail:
+	free_buffer(vq,buf);
+	return rc;
+}
+
+static void
+buffer_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
+{
+	struct vivi_buffer    *buf     = container_of(vb,struct vivi_buffer,vb);
+	struct vivi_fh        *fh      = vq->priv_data;
+	struct vivi_dev       *dev     = fh->dev;
+	struct vivi_dmaqueue  *vidq    = &dev->vidq;
+	struct vivi_buffer    *prev;
+
+	if (!list_empty(&vidq->queued)) {
+		dprintk(1,"adding vb queue=0x%08lx\n",(unsigned long)&buf->vb.queue);
+		list_add_tail(&buf->vb.queue,&vidq->queued);
+		buf->vb.state = STATE_QUEUED;
+		dprintk(2,"[%p/%d] buffer_queue - append to queued\n",
+			buf, buf->vb.i);
+	} else if (list_empty(&vidq->active)) {
+		list_add_tail(&buf->vb.queue,&vidq->active);
+
+		buf->vb.state = STATE_ACTIVE;
+		mod_timer(&vidq->timeout, jiffies+BUFFER_TIMEOUT);
+		dprintk(2,"[%p/%d] buffer_queue - first active\n",
+			buf, buf->vb.i);
+
+		vivi_start_thread(vidq);
+	} else {
+		prev = list_entry(vidq->active.prev, struct vivi_buffer, vb.queue);
+		if (prev->vb.width  == buf->vb.width  &&
+		    prev->vb.height == buf->vb.height &&
+		    prev->fmt       == buf->fmt) {
+			list_add_tail(&buf->vb.queue,&vidq->active);
+			buf->vb.state = STATE_ACTIVE;
+			dprintk(2,"[%p/%d] buffer_queue - append to active\n",
+				buf, buf->vb.i);
+
+		} else {
+			list_add_tail(&buf->vb.queue,&vidq->queued);
+			buf->vb.state = STATE_QUEUED;
+			dprintk(2,"[%p/%d] buffer_queue - first queued\n",
+				buf, buf->vb.i);
+		}
+	}
+}
+
+static void buffer_release(struct videobuf_queue *vq, struct videobuf_buffer *vb)
+{
+	struct vivi_buffer   *buf  = container_of(vb,struct vivi_buffer,vb);
+	struct vivi_fh       *fh   = vq->priv_data;
+	struct vivi_dev      *dev  = (struct vivi_dev*)fh->dev;
+	struct vivi_dmaqueue *vidq = &dev->vidq;
+
+	dprintk(1,"%s\n",__FUNCTION__);
+
+	vivi_stop_thread(vidq);
+
+	free_buffer(vq,buf);
+}
+
+int vivi_map_sg (void *dev, struct scatterlist *sg, int nents,
+	   int direction)
+{
+	int i;
+
+	dprintk(1,"%s, number of pages=%d\n",__FUNCTION__,nents);
+	BUG_ON(direction == DMA_NONE);
+
+	for (i = 0; i < nents; i++ ) {
+		BUG_ON(!sg[i].page);
+
+		sg[i].dma_address = page_to_phys(sg[i].page) + sg[i].offset;
+	}
+
+	return nents;
+}
+
+int vivi_unmap_sg(void *dev,struct scatterlist *sglist,int nr_pages,
+					int direction)
+{
+	dprintk(1,"%s\n",__FUNCTION__);
+	return 0;
+}
+
+int vivi_dma_sync_sg(void *dev,struct scatterlist *sglist,int nr_pages,
+					int direction)
+{
+//	dprintk(1,"%s\n",__FUNCTION__);
+
+//	flush_write_buffers();
+	return 0;
+}
+
+static struct videobuf_queue_ops vivi_video_qops = {
+	.buf_setup      = buffer_setup,
+	.buf_prepare    = buffer_prepare,
+	.buf_queue      = buffer_queue,
+	.buf_release    = buffer_release,
+
+	/* Non-pci handling routines */
+	.vb_map_sg      = vivi_map_sg,
+	.vb_dma_sync_sg = vivi_dma_sync_sg,
+	.vb_unmap_sg    = vivi_unmap_sg,
+};
+
+/* ------------------------------------------------------------------
+	IOCTL handling
+   ------------------------------------------------------------------*/
+
+static int vivi_try_fmt(struct vivi_dev *dev, struct vivi_fh *fh,
+			struct v4l2_format *f)
+{
+	struct vivi_fmt *fmt;
+	enum v4l2_field field;
+	unsigned int maxw, maxh;
+
+	if (format.fourcc != f->fmt.pix.pixelformat) {
+		dprintk(1,"Fourcc format invalid.\n");
+		return -EINVAL;
+	}
+	fmt=&format;
+
+	field = f->fmt.pix.field;
+
+	if (field == V4L2_FIELD_ANY) {
+//		field=V4L2_FIELD_INTERLACED;
+		field=V4L2_FIELD_SEQ_TB;
+	} else if (V4L2_FIELD_INTERLACED != field) {
+		dprintk(1,"Field type invalid.\n");
+		return -EINVAL;
+	}
+
+	maxw  = norm_maxw();
+	maxh  = norm_maxh();
+
+	f->fmt.pix.field = field;
+	if (f->fmt.pix.height < 32)
+		f->fmt.pix.height = 32;
+	if (f->fmt.pix.height > maxh)
+		f->fmt.pix.height = maxh;
+	if (f->fmt.pix.width < 48)
+		f->fmt.pix.width = 48;
+	if (f->fmt.pix.width > maxw)
+		f->fmt.pix.width = maxw;
+	f->fmt.pix.width &= ~0x03;
+	f->fmt.pix.bytesperline =
+		(f->fmt.pix.width * fmt->depth) >> 3;
+	f->fmt.pix.sizeimage =
+		f->fmt.pix.height * f->fmt.pix.bytesperline;
+
+	return 0;
+}
+
+static int res_get(struct vivi_dev *dev, struct vivi_fh *fh)
+{
+	/* is it free? */
+	down(&dev->lock);
+	if (dev->resources) {
+		/* no, someone else uses it */
+		up(&dev->lock);
+		return 0;
+	}
+	/* it's free, grab it */
+	dev->resources =1;
+	dprintk(1,"res: get\n");
+	up(&dev->lock);
+	return 1;
+}
+
+static inline int res_locked(struct vivi_dev *dev)
+{
+	return (dev->resources);
+}
+
+static void res_free(struct vivi_dev *dev, struct vivi_fh *fh)
+{
+	down(&dev->lock);
+	dev->resources = 0;
+	dprintk(1,"res: put\n");
+	up(&dev->lock);
+}
+
+static int vivi_do_ioctl(struct inode *inode, struct file *file, unsigned int cmd, void *arg)
+{
+	struct vivi_fh  *fh     = file->private_data;
+	struct vivi_dev *dev    = fh->dev;
+	int ret=0;
+
+	if (debug) {
+		if (_IOC_DIR(cmd) & _IOC_WRITE)
+			v4l_printk_ioctl_arg("vivi(w)",cmd, arg);
+		else if (!_IOC_DIR(cmd) & _IOC_READ) {
+			v4l_print_ioctl("vivi", cmd);
+		}
+	}
+
+	switch(cmd) {
+	/* --- capabilities ------------------------------------------ */
+	case VIDIOC_QUERYCAP:
+	{
+		struct v4l2_capability *cap = (struct v4l2_capability*)arg;
+
+		memset(cap, 0, sizeof(*cap));
+
+		strcpy(cap->driver, "vivi");
+		strcpy(cap->card, "vivi");
+		cap->version = VIVI_VERSION;
+		cap->capabilities =
+					V4L2_CAP_VIDEO_CAPTURE |
+					V4L2_CAP_STREAMING     |
+					V4L2_CAP_READWRITE;
+		break;
+	}
+	/* --- capture ioctls ---------------------------------------- */
+	case VIDIOC_ENUM_FMT:
+	{
+		struct v4l2_fmtdesc *f = arg;
+		enum v4l2_buf_type type;
+		unsigned int index;
+
+		index = f->index;
+		type  = f->type;
+
+		if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
+			ret=-EINVAL;
+			break;
+		}
+
+		switch (type) {
+		case V4L2_BUF_TYPE_VIDEO_CAPTURE:
+			if (index > 0){
+				ret=-EINVAL;
+				break;
+			}
+			memset(f,0,sizeof(*f));
+
+			f->index = index;
+			f->type  = type;
+			strlcpy(f->description,format.name,sizeof(f->description));
+			f->pixelformat = format.fourcc;
+			break;
+		default:
+			ret=-EINVAL;
+		}
+		break;
+	}
+	case VIDIOC_G_FMT:
+	{
+		struct v4l2_format *f = (struct v4l2_format *)arg;
+
+		if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
+			ret=-EINVAL;
+			break;
+		}
+
+		memset(&f->fmt.pix,0,sizeof(f->fmt.pix));
+		f->fmt.pix.width        = fh->width;
+		f->fmt.pix.height       = fh->height;
+		f->fmt.pix.field        = fh->vb_vidq.field;
+		f->fmt.pix.pixelformat  = fh->fmt->fourcc;
+		f->fmt.pix.bytesperline =
+			(f->fmt.pix.width * fh->fmt->depth) >> 3;
+		f->fmt.pix.sizeimage =
+			f->fmt.pix.height * f->fmt.pix.bytesperline;
+		break;
+	}
+	case VIDIOC_S_FMT:
+	{
+		struct v4l2_format *f = arg;
+
+		if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
+			dprintk(1,"Only capture supported.\n");
+			ret=-EINVAL;
+			break;
+		}
+
+		ret = vivi_try_fmt(dev,fh,f);
+		if (ret < 0)
+			break;
+
+		fh->fmt           = &format;
+		fh->width         = f->fmt.pix.width;
+		fh->height        = f->fmt.pix.height;
+		fh->vb_vidq.field = f->fmt.pix.field;
+		fh->type          = f->type;
+
+		break;
+	}
+	case VIDIOC_TRY_FMT:
+	{
+		struct v4l2_format *f = arg;
+		if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
+			ret=-EINVAL;
+			break;
+		}
+
+		ret=vivi_try_fmt(dev,fh,f);
+		break;
+	}
+	case VIDIOC_REQBUFS:
+		if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
+			ret=-EINVAL;
+			break;
+		}
+		ret=videobuf_reqbufs(&fh->vb_vidq, arg);
+		break;
+	case VIDIOC_QUERYBUF:
+		if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
+			ret=-EINVAL;
+			break;
+		}
+		ret=videobuf_querybuf(&fh->vb_vidq, arg);
+		break;
+	case VIDIOC_QBUF:
+		if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
+			ret=-EINVAL;
+			break;
+		}
+		ret=videobuf_qbuf(&fh->vb_vidq, arg);
+		break;
+	case VIDIOC_DQBUF:
+		if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
+			ret=-EINVAL;
+			break;
+		}
+		ret=videobuf_dqbuf(&fh->vb_vidq, arg,
+					file->f_flags & O_NONBLOCK);
+		break;
+#ifdef HAVE_V4L1
+	/* --- streaming capture ------------------------------------- */
+	case VIDIOCGMBUF:
+	{
+		struct video_mbuf *mbuf = arg;
+		struct videobuf_queue *q=&fh->vb_vidq;
+		struct v4l2_requestbuffers req;
+		unsigned int i;
+
+		memset(&req,0,sizeof(req));
+		req.type   = q->type;
+		req.count  = 8;
+		req.memory = V4L2_MEMORY_MMAP;
+		ret = videobuf_reqbufs(q,&req);
+		if (ret < 0)
+			break;
+		memset(mbuf,0,sizeof(*mbuf));
+		mbuf->frames = req.count;
+		mbuf->size   = 0;
+		for (i = 0; i < mbuf->frames; i++) {
+			mbuf->offsets[i]  = q->bufs[i]->boff;
+			mbuf->size       += q->bufs[i]->bsize;
+		}
+		break;
+	}
+#endif
+	case VIDIOC_STREAMON:
+	{
+		if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+			return -EINVAL;
+		if (!res_get(dev,fh))
+			return -EBUSY;
+		ret=videobuf_streamon(&fh->vb_vidq);
+		break;
+	}
+	case VIDIOC_STREAMOFF:
+	{
+		if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
+			ret=-EINVAL;
+			break;
+		}
+		ret = videobuf_streamoff(&fh->vb_vidq);
+		if (ret < 0)
+			break;
+		res_free(dev,fh);
+		break;
+	}
+	/* ---------- tv norms ---------- */
+	case VIDIOC_ENUMSTD:
+	{
+		struct v4l2_standard *e = arg;
+
+		if (e->index>0) {
+			ret=-EINVAL;
+			break;
+		}
+		ret = v4l2_video_std_construct(e, V4L2_STD_NTSC_M, "NTSC-M");
+
+		/* Allows vivi to use different fps from video std */
+		e->frameperiod.numerator = WAKE_NUMERATOR;
+		e->frameperiod.denominator = WAKE_DENOMINATOR;
+
+		break;
+	}
+	case VIDIOC_G_STD:
+	{
+		v4l2_std_id *id = arg;
+
+		*id = V4L2_STD_NTSC_M;
+		break;
+	}
+	case VIDIOC_S_STD:
+	{
+		break;
+	}
+	/* ------ input switching ---------- */
+	case VIDIOC_ENUMINPUT:
+	{ /* only one input in this sample driver */
+		struct v4l2_input *inp = arg;
+
+		if (inp->index != 0) {
+			ret=-EINVAL;
+			break;
+		}
+		memset(inp, 0, sizeof(*inp));
+
+		inp->index = 0;
+		inp->type = V4L2_INPUT_TYPE_CAMERA;
+		inp->std = V4L2_STD_NTSC_M;
+		strcpy(inp->name,"Camera");
+		break;
+	}
+	case VIDIOC_G_INPUT:
+	{
+		unsigned int *i = arg;
+
+		*i = 0;
+		break;
+	}
+	case VIDIOC_S_INPUT:
+	{
+		unsigned int *i = arg;
+
+		if (*i > 0)
+			ret=-EINVAL;
+		break;
+	}
+
+	/* --- controls ---------------------------------------------- */
+	case VIDIOC_QUERYCTRL:
+	{
+		struct v4l2_queryctrl *qc = arg;
+		int i;
+
+		for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
+			if (qc->id && qc->id == vivi_qctrl[i].id) {
+				memcpy(qc, &(vivi_qctrl[i]),
+					sizeof(*qc));
+				break;
+			}
+
+		ret=-EINVAL;
+		break;
+	}
+	case VIDIOC_G_CTRL:
+	{
+		struct v4l2_control *ctrl = arg;
+		int i;
+
+		for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
+			if (ctrl->id == vivi_qctrl[i].id) {
+				ctrl->value=qctl_regs[i];
+				break;
+			}
+
+		ret=-EINVAL;
+		break;
+	}
+	case VIDIOC_S_CTRL:
+	{
+		struct v4l2_control *ctrl = arg;
+		int i;
+		for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
+			if (ctrl->id == vivi_qctrl[i].id) {
+				if (ctrl->value <
+					vivi_qctrl[i].minimum
+					|| ctrl->value >
+					vivi_qctrl[i].maximum) {
+						ret=-ERANGE;
+						break;
+					}
+				qctl_regs[i]=ctrl->value;
+				break;
+			}
+		ret=-EINVAL;
+		break;
+	}
+	default:
+		ret=v4l_compat_translate_ioctl(inode,file,cmd,arg,vivi_do_ioctl);
+	}
+
+	if (debug) {
+		if (ret<0) {
+			v4l_print_ioctl("vivi(err)", cmd);
+			dprintk(1,"errcode=%d\n",ret);
+		} else if (_IOC_DIR(cmd) & _IOC_READ)
+			v4l_printk_ioctl_arg("vivi(r)",cmd, arg);
+	}
+
+	return ret;
+}
+
+static int vivi_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
+{
+	return video_usercopy(inode, file, cmd, arg, vivi_do_ioctl);
+}
+
+/* ------------------------------------------------------------------
+	File operations for the device
+   ------------------------------------------------------------------*/
+
+#define line_buf_size(norm) (norm_maxw(norm)*(format.depth+7)/8)
+
+static int vivi_open(struct inode *inode, struct file *file)
+{
+	int minor = iminor(inode);
+	struct vivi_dev *h,*dev = NULL;
+	struct vivi_fh *fh;
+	struct list_head *list;
+	enum v4l2_buf_type type = 0;
+	int i;
+
+	printk(KERN_DEBUG "vivi: open called (minor=%d)\n",minor);
+
+	list_for_each(list,&vivi_devlist) {
+		h = list_entry(list, struct vivi_dev, vivi_devlist);
+		if (h->video_dev.minor == minor) {
+			dev  = h;
+			type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+		}
+	}
+	if (NULL == dev)
+		return -ENODEV;
+
+
+	/* If more than one user, mutex should be added */
+	dev->users++;
+
+	dprintk(1,"open minor=%d type=%s users=%d\n",
+				minor,v4l2_type_names[type],dev->users);
+
+	/* allocate + initialize per filehandle data */
+	fh = kzalloc(sizeof(*fh),GFP_KERNEL);
+	if (NULL == fh) {
+		dev->users--;
+		return -ENOMEM;
+	}
+
+	file->private_data = fh;
+	fh->dev      = dev;
+	fh->type     = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+	fh->fmt      = &format;
+	fh->width    = 640;
+	fh->height   = 480;
+
+	/* Put all controls at a sane state */
+	for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
+		qctl_regs[i] =vivi_qctrl[i].default_value;
+
+	dprintk(1,"Open: fh=0x%08lx, dev=0x%08lx, dev->vidq=0x%08lx\n",
+		(unsigned long)fh,(unsigned long)dev,(unsigned long)&dev->vidq);
+	dprintk(1,"Open: list_empty queued=%d\n",list_empty(&dev->vidq.queued));
+	dprintk(1,"Open: list_empty active=%d\n",list_empty(&dev->vidq.active));
+
+	/* Resets frame counters */
+	dev->h=0;
+	dev->m=0;
+	dev->s=0;
+	dev->us=0;
+	dev->jiffies=jiffies;
+	sprintf(dev->timestr,"%02d:%02d:%02d:%03d",
+			dev->h,dev->m,dev->s,(dev->us+500)/1000);
+
+	videobuf_queue_init(&fh->vb_vidq, &vivi_video_qops,
+			NULL, NULL,
+			fh->type,
+			V4L2_FIELD_INTERLACED,
+			sizeof(struct vivi_buffer),fh);
+
+	return 0;
+}
+
+static ssize_t
+vivi_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
+{
+	struct vivi_fh *fh = file->private_data;
+
+	if (fh->type==V4L2_BUF_TYPE_VIDEO_CAPTURE) {
+		if (res_locked(fh->dev))
+			return -EBUSY;
+		return videobuf_read_one(&fh->vb_vidq, data, count, ppos,
+					file->f_flags & O_NONBLOCK);
+	}
+	return 0;
+}
+
+static unsigned int
+vivi_poll(struct file *file, struct poll_table_struct *wait)
+{
+	struct vivi_fh *fh = file->private_data;
+	struct vivi_buffer *buf;
+
+	dprintk(1,"%s\n",__FUNCTION__);
+
+	if (V4L2_BUF_TYPE_VIDEO_CAPTURE != fh->type)
+		return POLLERR;
+
+	if (res_get(fh->dev,fh)) {
+		dprintk(1,"poll: mmap interface\n");
+		/* streaming capture */
+		if (list_empty(&fh->vb_vidq.stream))
+			return POLLERR;
+		buf = list_entry(fh->vb_vidq.stream.next,struct vivi_buffer,vb.stream);
+	} else {
+		dprintk(1,"poll: read() interface\n");
+		/* read() capture */
+		buf = (struct vivi_buffer*)fh->vb_vidq.read_buf;
+		if (NULL == buf)
+			return POLLERR;
+	}
+	poll_wait(file, &buf->vb.done, wait);
+	if (buf->vb.state == STATE_DONE ||
+	    buf->vb.state == STATE_ERROR)
+		return POLLIN|POLLRDNORM;
+	return 0;
+}
+
+static int vivi_release(struct inode *inode, struct file *file)
+{
+	struct vivi_fh  *fh     = file->private_data;
+	struct vivi_dev *dev    = fh->dev;
+	struct vivi_dmaqueue *vidq = &dev->vidq;
+
+	int minor = iminor(inode);
+
+	vivi_stop_thread(vidq);
+	videobuf_mmap_free(&fh->vb_vidq);
+
+	kfree (fh);
+
+	dev->users--;
+
+	printk(KERN_DEBUG "vivi: close called (minor=%d, users=%d)\n",minor,dev->users);
+
+	return 0;
+}
+
+static int
+vivi_mmap(struct file *file, struct vm_area_struct * vma)
+{
+	struct vivi_fh *fh = file->private_data;
+	int ret;
+
+	dprintk (1,"mmap called, vma=0x%08lx\n",(unsigned long)vma);
+
+	ret=videobuf_mmap_mapper(&fh->vb_vidq, vma);
+
+	dprintk (1,"vma start=0x%08lx, size=%ld, ret=%d\n",
+		(unsigned long)vma->vm_start,
+		(unsigned long)vma->vm_end-(unsigned long)vma->vm_start,
+		ret);
+
+	return ret;
+}
+
+static struct file_operations vivi_fops = {
+	.owner		= THIS_MODULE,
+	.open           = vivi_open,
+	.release        = vivi_release,
+	.read           = vivi_read,
+	.poll		= vivi_poll,
+	.ioctl          = vivi_ioctl,
+	.mmap		= vivi_mmap,
+	.llseek         = no_llseek,
+};
+
+static struct video_device vivi = {
+	.name		= "VTM Virtual Video Capture Board",
+	.type		= VID_TYPE_CAPTURE,
+	.hardware	= 0,
+	.fops           = &vivi_fops,
+	.minor		= -1,
+//	.release	= video_device_release,
+};
+/* ------------------------------------------------------------------
+	Initialization and module stuff
+   ------------------------------------------------------------------*/
+
+static int __init vivi_init(void)
+{
+	int ret;
+	struct vivi_dev *dev;
+
+	dev = kzalloc(sizeof(*dev),GFP_KERNEL);
+	if (NULL == dev)
+		return -ENOMEM;
+	list_add_tail(&dev->vivi_devlist,&vivi_devlist);
+
+	/* init video dma queues */
+	INIT_LIST_HEAD(&dev->vidq.active);
+	INIT_LIST_HEAD(&dev->vidq.queued);
+
+	/* initialize locks */
+	init_MUTEX(&dev->lock);
+
+	dev->vidq.timeout.function = vivi_vid_timeout;
+	dev->vidq.timeout.data     = (unsigned long)dev;
+	init_timer(&dev->vidq.timeout);
+
+	ret = video_register_device(&vivi, VFL_TYPE_GRABBER, video_nr);
+	printk(KERN_INFO "Video Technology Magazine Virtual Video Capture Board (Load status: %d)\n", ret);
+	return ret;
+}
+
+static void __exit vivi_exit(void)
+{
+	struct vivi_dev *h;
+	struct list_head *list;
+
+	list_for_each(list,&vivi_devlist) {
+		h = list_entry(list, struct vivi_dev, vivi_devlist);
+		kfree (h);
+	}
+	video_unregister_device(&vivi);
+}
+
+module_init(vivi_init);
+module_exit(vivi_exit);