/*

   * helper functions for SG DMA video4linux capture buffers

   *

   * The functions expect the hardware being able to scatter gather

   * (i.e. the buffers are not linear in physical memory, but fragmented
   * into PAGE_SIZE chunks).  They also assume the driver does not need
   * to touch the video data.
   *
   * (c) 2007 Mauro Carvalho Chehab, <mchehab@infradead.org>
   *
   * Highly based on video-buf written originally by:
   * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org>
   * (c) 2006 Mauro Carvalho Chehab, <mchehab@infradead.org>
   * (c) 2006 Ted Walther and John Sokol
   *
   * 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
   * the Free Software Foundation; either version 2
   */
  
  #include <linux/init.h>
  #include <linux/module.h>
  #include <linux/moduleparam.h>
  #include <linux/slab.h>
  #include <linux/interrupt.h>

  #include <linux/dma-mapping.h>

  #include <linux/vmalloc.h>
  #include <linux/pagemap.h>

  #include <linux/scatterlist.h>

  #include <asm/page.h>
  #include <asm/pgtable.h>
  
  #include <media/videobuf-dma-sg.h>
  
  #define MAGIC_DMABUF 0x19721112
  #define MAGIC_SG_MEM 0x17890714
  
  #define MAGIC_CHECK(is,should)	if (unlikely((is) != (should))) \
  	{ printk(KERN_ERR "magic mismatch: %x (expected %x)
  ",is,should); BUG(); }

  static int debug;

  module_param(debug, int, 0644);

  MODULE_DESCRIPTION("helper module to manage video4linux dma sg buffers");

  MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
  MODULE_LICENSE("GPL");
  
  #define dprintk(level, fmt, arg...)	if (debug >= level) \
  	printk(KERN_DEBUG "vbuf-sg: " fmt , ## arg)
  
  /* --------------------------------------------------------------------- */
  
  struct scatterlist*
  videobuf_vmalloc_to_sg(unsigned char *virt, int nr_pages)
  {
  	struct scatterlist *sglist;
  	struct page *pg;
  	int i;
  
  	sglist = kcalloc(nr_pages, sizeof(struct scatterlist), GFP_KERNEL);
  	if (NULL == sglist)
  		return NULL;

  	sg_init_table(sglist, nr_pages);

  	for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) {
  		pg = vmalloc_to_page(virt);
  		if (NULL == pg)
  			goto err;
  		BUG_ON(PageHighMem(pg));

  		sg_set_page(&sglist[i], pg, PAGE_SIZE, 0);

  	}
  	return sglist;
  
   err:
  	kfree(sglist);
  	return NULL;
  }
  
  struct scatterlist*
  videobuf_pages_to_sg(struct page **pages, int nr_pages, int offset)
  {
  	struct scatterlist *sglist;

  	int i;

  
  	if (NULL == pages[0])
  		return NULL;

  	sglist = kmalloc(nr_pages * sizeof(*sglist), GFP_KERNEL);

  	if (NULL == sglist)
  		return NULL;

  	sg_init_table(sglist, nr_pages);

  	if (PageHighMem(pages[0]))
  		/* DMA to highmem pages might not work */
  		goto highmem;

  	sg_set_page(&sglist[0], pages[0], PAGE_SIZE - offset, offset);

  	for (i = 1; i < nr_pages; i++) {
  		if (NULL == pages[i])
  			goto nopage;
  		if (PageHighMem(pages[i]))
  			goto highmem;

  		sg_set_page(&sglist[i], pages[i], PAGE_SIZE, 0);

  	}
  	return sglist;
  
   nopage:
  	dprintk(2,"sgl: oops - no page
  ");
  	kfree(sglist);
  	return NULL;
  
   highmem:
  	dprintk(2,"sgl: oops - highmem page
  ");
  	kfree(sglist);
  	return NULL;
  }
  
  /* --------------------------------------------------------------------- */
  
  struct videobuf_dmabuf *videobuf_to_dma (struct videobuf_buffer *buf)
  {

  	struct videobuf_dma_sg_memory *mem = buf->priv;
  	BUG_ON(!mem);

  	MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);

  
  	return &mem->dma;
  }
  
  void videobuf_dma_init(struct videobuf_dmabuf *dma)
  {
  	memset(dma,0,sizeof(*dma));
  	dma->magic = MAGIC_DMABUF;
  }

  static int videobuf_dma_init_user_locked(struct videobuf_dmabuf *dma,
  			int direction, unsigned long data, unsigned long size)

  {
  	unsigned long first,last;
  	int err, rw = 0;
  
  	dma->direction = direction;
  	switch (dma->direction) {

  	case DMA_FROM_DEVICE:
  		rw = READ;
  		break;
  	case DMA_TO_DEVICE:
  		rw = WRITE;
  		break;
  	default:
  		BUG();

  	}
  
  	first = (data          & PAGE_MASK) >> PAGE_SHIFT;
  	last  = ((data+size-1) & PAGE_MASK) >> PAGE_SHIFT;
  	dma->offset   = data & ~PAGE_MASK;
  	dma->nr_pages = last-first+1;
  	dma->pages = kmalloc(dma->nr_pages * sizeof(struct page*),
  			     GFP_KERNEL);
  	if (NULL == dma->pages)
  		return -ENOMEM;
  	dprintk(1,"init user [0x%lx+0x%lx => %d pages]
  ",
  		data,size,dma->nr_pages);

  	err = get_user_pages(current,current->mm,
  			     data & PAGE_MASK, dma->nr_pages,
  			     rw == READ, 1, /* force */
  			     dma->pages, NULL);

  	if (err != dma->nr_pages) {
  		dma->nr_pages = (err >= 0) ? err : 0;
  		dprintk(1,"get_user_pages: err=%d [%d]
  ",err,dma->nr_pages);
  		return err < 0 ? err : -EINVAL;
  	}
  	return 0;
  }

  int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction,
  			   unsigned long data, unsigned long size)
  {
  	int ret;
  	down_read(&current->mm->mmap_sem);
  	ret = videobuf_dma_init_user_locked(dma, direction, data, size);
  	up_read(&current->mm->mmap_sem);
  
  	return ret;
  }

  int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction,
  			     int nr_pages)
  {
  	dprintk(1,"init kernel [%d pages]
  ",nr_pages);
  	dma->direction = direction;
  	dma->vmalloc = vmalloc_32(nr_pages << PAGE_SHIFT);
  	if (NULL == dma->vmalloc) {
  		dprintk(1,"vmalloc_32(%d pages) failed
  ",nr_pages);
  		return -ENOMEM;
  	}
  	dprintk(1,"vmalloc is at addr 0x%08lx, size=%d
  ",
  				(unsigned long)dma->vmalloc,
  				nr_pages << PAGE_SHIFT);
  	memset(dma->vmalloc,0,nr_pages << PAGE_SHIFT);
  	dma->nr_pages = nr_pages;
  	return 0;
  }
  
  int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction,
  			      dma_addr_t addr, int nr_pages)
  {
  	dprintk(1,"init overlay [%d pages @ bus 0x%lx]
  ",
  		nr_pages,(unsigned long)addr);
  	dma->direction = direction;
  	if (0 == addr)
  		return -EINVAL;
  
  	dma->bus_addr = addr;
  	dma->nr_pages = nr_pages;
  	return 0;
  }

  int videobuf_dma_map(struct videobuf_queue* q, struct videobuf_dmabuf *dma)

  {

  	MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
  	BUG_ON(0 == dma->nr_pages);
  
  	if (dma->pages) {
  		dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages,
  						   dma->offset);
  	}
  	if (dma->vmalloc) {
  		dma->sglist = videobuf_vmalloc_to_sg
  						(dma->vmalloc,dma->nr_pages);
  	}
  	if (dma->bus_addr) {
  		dma->sglist = kmalloc(sizeof(struct scatterlist), GFP_KERNEL);
  		if (NULL != dma->sglist) {
  			dma->sglen  = 1;
  			sg_dma_address(&dma->sglist[0]) = dma->bus_addr & PAGE_MASK;
  			dma->sglist[0].offset           = dma->bus_addr & ~PAGE_MASK;
  			sg_dma_len(&dma->sglist[0])     = dma->nr_pages * PAGE_SIZE;
  		}
  	}
  	if (NULL == dma->sglist) {
  		dprintk(1,"scatterlist is NULL
  ");
  		return -ENOMEM;
  	}
  	if (!dma->bus_addr) {

  		dma->sglen = dma_map_sg(q->dev, dma->sglist,

  					dma->nr_pages, dma->direction);

  		if (0 == dma->sglen) {
  			printk(KERN_WARNING

  			       "%s: videobuf_map_sg failed
  ",__func__);

  			kfree(dma->sglist);
  			dma->sglist = NULL;
  			dma->sglen = 0;
  			return -EIO;
  		}
  	}
  	return 0;
  }

  int videobuf_dma_sync(struct videobuf_queue *q, struct videobuf_dmabuf *dma)

  {

  	MAGIC_CHECK(dma->magic, MAGIC_DMABUF);

  	BUG_ON(!dma->sglen);

  	dma_sync_sg_for_cpu(q->dev, dma->sglist, dma->nr_pages, dma->direction);

  	return 0;
  }
  
  int videobuf_dma_unmap(struct videobuf_queue* q,struct videobuf_dmabuf *dma)
  {

  	MAGIC_CHECK(dma->magic, MAGIC_DMABUF);

  	if (!dma->sglen)
  		return 0;

  	dma_unmap_sg(q->dev, dma->sglist, dma->nr_pages, dma->direction);

  	kfree(dma->sglist);
  	dma->sglist = NULL;
  	dma->sglen = 0;
  	return 0;
  }
  
  int videobuf_dma_free(struct videobuf_dmabuf *dma)
  {
  	MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
  	BUG_ON(dma->sglen);
  
  	if (dma->pages) {
  		int i;
  		for (i=0; i < dma->nr_pages; i++)
  			page_cache_release(dma->pages[i]);
  		kfree(dma->pages);
  		dma->pages = NULL;
  	}
  
  	vfree(dma->vmalloc);
  	dma->vmalloc = NULL;

  
  	if (dma->bus_addr) {
  		dma->bus_addr = 0;
  	}

  	dma->direction = DMA_NONE;

  	return 0;
  }
  
  /* --------------------------------------------------------------------- */

  int videobuf_sg_dma_map(struct device *dev, struct videobuf_dmabuf *dma)

  {
  	struct videobuf_queue q;

  	q.dev = dev;

  	return videobuf_dma_map(&q, dma);

  }

  int videobuf_sg_dma_unmap(struct device *dev, struct videobuf_dmabuf *dma)

  {
  	struct videobuf_queue q;

  	q.dev = dev;

  	return videobuf_dma_unmap(&q, dma);

  }
  
  /* --------------------------------------------------------------------- */
  
  static void
  videobuf_vm_open(struct vm_area_struct *vma)
  {
  	struct videobuf_mapping *map = vma->vm_private_data;
  
  	dprintk(2,"vm_open %p [count=%d,vma=%08lx-%08lx]
  ",map,
  		map->count,vma->vm_start,vma->vm_end);
  	map->count++;
  }
  
  static void
  videobuf_vm_close(struct vm_area_struct *vma)
  {
  	struct videobuf_mapping *map = vma->vm_private_data;
  	struct videobuf_queue *q = map->q;

  	struct videobuf_dma_sg_memory *mem;

  	int i;
  
  	dprintk(2,"vm_close %p [count=%d,vma=%08lx-%08lx]
  ",map,
  		map->count,vma->vm_start,vma->vm_end);
  
  	map->count--;
  	if (0 == map->count) {
  		dprintk(1,"munmap %p q=%p
  ",map,q);

  		mutex_lock(&q->vb_lock);

  		for (i = 0; i < VIDEO_MAX_FRAME; i++) {
  			if (NULL == q->bufs[i])
  				continue;
  			mem=q->bufs[i]->priv;
  
  			if (!mem)
  				continue;
  
  			MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);

  			if (q->bufs[i]->map != map)

  				continue;

  			q->bufs[i]->map   = NULL;

  			q->bufs[i]->baddr = 0;
  			q->ops->buf_release(q,q->bufs[i]);
  		}

  		mutex_unlock(&q->vb_lock);

  		kfree(map);
  	}
  	return;
  }
  
  /*
   * Get a anonymous page for the mapping.  Make sure we can DMA to that
   * memory location with 32bit PCI devices (i.e. don't use highmem for
   * now ...).  Bounce buffers don't work very well for the data rates
   * video capture has.
   */

  static int
  videobuf_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)

  {
  	struct page *page;

  	dprintk(3,"fault: fault @ %08lx [vma %08lx-%08lx]
  ",
  		(unsigned long)vmf->virtual_address,vma->vm_start,vma->vm_end);

  	page = alloc_page(GFP_USER | __GFP_DMA32);
  	if (!page)

  		return VM_FAULT_OOM;

  	clear_user_highpage(page, (unsigned long)vmf->virtual_address);

  	vmf->page = page;
  	return 0;

  }
  
  static struct vm_operations_struct videobuf_vm_ops =
  {
  	.open     = videobuf_vm_open,
  	.close    = videobuf_vm_close,

  	.fault    = videobuf_vm_fault,

  };
  
  /* ---------------------------------------------------------------------

   * SG handlers for the generic methods

   */
  
  /* Allocated area consists on 3 parts:
  	struct video_buffer
  	struct <driver>_buffer (cx88_buffer, saa7134_buf, ...)

  	struct videobuf_dma_sg_memory

   */
  
  static void *__videobuf_alloc(size_t size)
  {

  	struct videobuf_dma_sg_memory *mem;

  	struct videobuf_buffer *vb;
  
  	vb = kzalloc(size+sizeof(*mem),GFP_KERNEL);
  
  	mem = vb->priv = ((char *)vb)+size;
  	mem->magic=MAGIC_SG_MEM;
  
  	videobuf_dma_init(&mem->dma);
  
  	dprintk(1,"%s: allocated at %p(%ld+%ld) & %p(%ld)
  ",

  		__func__,vb,(long)sizeof(*vb),(long)size-sizeof(*vb),

  		mem,(long)sizeof(*mem));
  
  	return vb;
  }

  static void *__videobuf_to_vmalloc (struct videobuf_buffer *buf)
  {
  	struct videobuf_dma_sg_memory *mem = buf->priv;
  	BUG_ON(!mem);
  
  	MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
  
  	return mem->dma.vmalloc;
  }

  static int __videobuf_iolock (struct videobuf_queue* q,
  			      struct videobuf_buffer *vb,
  			      struct v4l2_framebuffer *fbuf)
  {
  	int err,pages;
  	dma_addr_t bus;

  	struct videobuf_dma_sg_memory *mem = vb->priv;

  	BUG_ON(!mem);

  	MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);

  
  	switch (vb->memory) {
  	case V4L2_MEMORY_MMAP:
  	case V4L2_MEMORY_USERPTR:
  		if (0 == vb->baddr) {
  			/* no userspace addr -- kernel bounce buffer */
  			pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
  			err = videobuf_dma_init_kernel( &mem->dma,

  							DMA_FROM_DEVICE,

  							pages );
  			if (0 != err)
  				return err;

  		} else if (vb->memory == V4L2_MEMORY_USERPTR) {

  			/* dma directly to userspace */
  			err = videobuf_dma_init_user( &mem->dma,

  						      DMA_FROM_DEVICE,

  						      vb->baddr,vb->bsize );
  			if (0 != err)
  				return err;

  		} else {
  			/* NOTE: HACK: videobuf_iolock on V4L2_MEMORY_MMAP
  			buffers can only be called from videobuf_qbuf
  			we take current->mm->mmap_sem there, to prevent
  			locking inversion, so don't take it here */
  
  			err = videobuf_dma_init_user_locked(&mem->dma,

  						      DMA_FROM_DEVICE,

  						      vb->baddr, vb->bsize);
  			if (0 != err)
  				return err;

  		}
  		break;
  	case V4L2_MEMORY_OVERLAY:
  		if (NULL == fbuf)
  			return -EINVAL;
  		/* FIXME: need sanity checks for vb->boff */
  		/*
  		 * Using a double cast to avoid compiler warnings when
  		 * building for PAE. Compiler doesn't like direct casting
  		 * of a 32 bit ptr to 64 bit integer.
  		 */
  		bus   = (dma_addr_t)(unsigned long)fbuf->base + vb->boff;
  		pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;

  		err = videobuf_dma_init_overlay(&mem->dma, DMA_FROM_DEVICE,

  						bus, pages);
  		if (0 != err)
  			return err;
  		break;
  	default:
  		BUG();
  	}

  	err = videobuf_dma_map(q, &mem->dma);

  	if (0 != err)
  		return err;
  
  	return 0;
  }
  
  static int __videobuf_sync(struct videobuf_queue *q,
  			   struct videobuf_buffer *buf)
  {

  	struct videobuf_dma_sg_memory *mem = buf->priv;
  	BUG_ON(!mem);

  	MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
  
  	return	videobuf_dma_sync(q,&mem->dma);
  }
  
  static int __videobuf_mmap_free(struct videobuf_queue *q)
  {
  	int i;
  
  	for (i = 0; i < VIDEO_MAX_FRAME; i++) {
  		if (q->bufs[i]) {

  			if (q->bufs[i]->map)

  				return -EBUSY;
  		}
  	}
  
  	return 0;
  }
  
  static int __videobuf_mmap_mapper(struct videobuf_queue *q,
  			 struct vm_area_struct *vma)
  {

  	struct videobuf_dma_sg_memory *mem;

  	struct videobuf_mapping *map;
  	unsigned int first,last,size,i;
  	int retval;
  
  	retval = -EINVAL;
  	if (!(vma->vm_flags & VM_WRITE)) {
  		dprintk(1,"mmap app bug: PROT_WRITE please
  ");
  		goto done;
  	}
  	if (!(vma->vm_flags & VM_SHARED)) {
  		dprintk(1,"mmap app bug: MAP_SHARED please
  ");
  		goto done;
  	}

  	/* This function maintains backwards compatibility with V4L1 and will
  	 * map more than one buffer if the vma length is equal to the combined
  	 * size of multiple buffers than it will map them together.  See
  	 * VIDIOCGMBUF in the v4l spec
  	 *
  	 * TODO: Allow drivers to specify if they support this mode
  	 */

  	/* look for first buffer to map */
  	for (first = 0; first < VIDEO_MAX_FRAME; first++) {
  		if (NULL == q->bufs[first])
  			continue;
  		mem=q->bufs[first]->priv;

  		BUG_ON(!mem);

  		MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
  
  		if (V4L2_MEMORY_MMAP != q->bufs[first]->memory)
  			continue;
  		if (q->bufs[first]->boff == (vma->vm_pgoff << PAGE_SHIFT))
  			break;
  	}
  	if (VIDEO_MAX_FRAME == first) {
  		dprintk(1,"mmap app bug: offset invalid [offset=0x%lx]
  ",
  			(vma->vm_pgoff << PAGE_SHIFT));
  		goto done;
  	}
  
  	/* look for last buffer to map */
  	for (size = 0, last = first; last < VIDEO_MAX_FRAME; last++) {
  		if (NULL == q->bufs[last])
  			continue;
  		if (V4L2_MEMORY_MMAP != q->bufs[last]->memory)
  			continue;

  		if (q->bufs[last]->map) {

  			retval = -EBUSY;
  			goto done;
  		}
  		size += q->bufs[last]->bsize;
  		if (size == (vma->vm_end - vma->vm_start))
  			break;
  	}
  	if (VIDEO_MAX_FRAME == last) {
  		dprintk(1,"mmap app bug: size invalid [size=0x%lx]
  ",
  			(vma->vm_end - vma->vm_start));
  		goto done;
  	}
  
  	/* create mapping + update buffer list */
  	retval = -ENOMEM;
  	map = kmalloc(sizeof(struct videobuf_mapping),GFP_KERNEL);
  	if (NULL == map)
  		goto done;

  
  	size = 0;
  	for (i = first; i <= last; i++) {
  		if (NULL == q->bufs[i])
  			continue;

  		q->bufs[i]->map   = map;

  		q->bufs[i]->baddr = vma->vm_start + size;

  		size += q->bufs[i]->bsize;

  	}

  	map->count    = 1;
  	map->start    = vma->vm_start;
  	map->end      = vma->vm_end;
  	map->q        = q;
  	vma->vm_ops   = &videobuf_vm_ops;
  	vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED;
  	vma->vm_flags &= ~VM_IO; /* using shared anonymous pages */
  	vma->vm_private_data = map;
  	dprintk(1,"mmap %p: q=%p %08lx-%08lx pgoff %08lx bufs %d-%d
  ",
  		map,q,vma->vm_start,vma->vm_end,vma->vm_pgoff,first,last);
  	retval = 0;
  
   done:
  	return retval;
  }

  static int __videobuf_copy_to_user ( struct videobuf_queue *q,
  				char __user *data, size_t count,
  				int nonblocking )
  {

  	struct videobuf_dma_sg_memory *mem = q->read_buf->priv;
  	BUG_ON(!mem);

  	MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
  
  	/* copy to userspace */
  	if (count > q->read_buf->size - q->read_off)
  		count = q->read_buf->size - q->read_off;
  
  	if (copy_to_user(data, mem->dma.vmalloc+q->read_off, count))
  		return -EFAULT;
  
  	return count;
  }
  
  static int __videobuf_copy_stream ( struct videobuf_queue *q,
  				char __user *data, size_t count, size_t pos,
  				int vbihack, int nonblocking )
  {
  	unsigned int  *fc;

  	struct videobuf_dma_sg_memory *mem = q->read_buf->priv;
  	BUG_ON(!mem);

  	MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
  
  	if (vbihack) {
  		/* dirty, undocumented hack -- pass the frame counter
  			* within the last four bytes of each vbi data block.
  			* We need that one to maintain backward compatibility
  			* to all vbi decoding software out there ... */
  		fc  = (unsigned int*)mem->dma.vmalloc;
  		fc += (q->read_buf->size>>2) -1;
  		*fc = q->read_buf->field_count >> 1;
  		dprintk(1,"vbihack: %d
  ",*fc);
  	}
  
  	/* copy stuff using the common method */
  	count = __videobuf_copy_to_user (q,data,count,nonblocking);
  
  	if ( (count==-EFAULT) && (0 == pos) )
  		return -EFAULT;
  
  	return count;
  }

  static struct videobuf_qtype_ops sg_ops = {

  	.magic        = MAGIC_QTYPE_OPS,
  
  	.alloc        = __videobuf_alloc,
  	.iolock       = __videobuf_iolock,
  	.sync         = __videobuf_sync,
  	.mmap_free    = __videobuf_mmap_free,
  	.mmap_mapper  = __videobuf_mmap_mapper,

  	.video_copy_to_user = __videobuf_copy_to_user,

  	.copy_stream  = __videobuf_copy_stream,

  	.vmalloc      = __videobuf_to_vmalloc,

  };

  void *videobuf_sg_alloc(size_t size)

  {
  	struct videobuf_queue q;
  
  	/* Required to make generic handler to call __videobuf_alloc */

  	q.int_ops = &sg_ops;

  	q.msize = size;

  	return videobuf_alloc(&q);

  }

  void videobuf_queue_sg_init(struct videobuf_queue* q,

  			 struct videobuf_queue_ops *ops,

  			 struct device *dev,

  			 spinlock_t *irqlock,
  			 enum v4l2_buf_type type,
  			 enum v4l2_field field,
  			 unsigned int msize,
  			 void *priv)
  {

  	videobuf_queue_core_init(q, ops, dev, irqlock, type, field, msize,

  				 priv, &sg_ops);

  }

  /* --------------------------------------------------------------------- */
  
  EXPORT_SYMBOL_GPL(videobuf_vmalloc_to_sg);
  
  EXPORT_SYMBOL_GPL(videobuf_to_dma);
  EXPORT_SYMBOL_GPL(videobuf_dma_init);
  EXPORT_SYMBOL_GPL(videobuf_dma_init_user);
  EXPORT_SYMBOL_GPL(videobuf_dma_init_kernel);
  EXPORT_SYMBOL_GPL(videobuf_dma_init_overlay);
  EXPORT_SYMBOL_GPL(videobuf_dma_map);
  EXPORT_SYMBOL_GPL(videobuf_dma_sync);
  EXPORT_SYMBOL_GPL(videobuf_dma_unmap);
  EXPORT_SYMBOL_GPL(videobuf_dma_free);

  EXPORT_SYMBOL_GPL(videobuf_sg_dma_map);
  EXPORT_SYMBOL_GPL(videobuf_sg_dma_unmap);
  EXPORT_SYMBOL_GPL(videobuf_sg_alloc);

  EXPORT_SYMBOL_GPL(videobuf_queue_sg_init);

  
  /*
   * Local variables:
   * c-basic-offset: 8
   * End:
   */