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saa7146_video.c

#include <media/saa7146_vv.h>

static int max_memory = 32;

module_param(max_memory, int, 0644);
MODULE_PARM_DESC(max_memory, "maximum memory usage for capture buffers (default: 32Mb)");

#define IS_CAPTURE_ACTIVE(fh) \
      (((vv->video_status & STATUS_CAPTURE) != 0) && (vv->video_fh == fh))

#define IS_OVERLAY_ACTIVE(fh) \
      (((vv->video_status & STATUS_OVERLAY) != 0) && (vv->video_fh == fh))

/* format descriptions for capture and preview */
static struct saa7146_format formats[] = {
      {
            .name       = "RGB-8 (3-3-2)",
            .pixelformat      = V4L2_PIX_FMT_RGB332,
            .trans            = RGB08_COMPOSED,
            .depth            = 8,
            .flags            = 0,
      }, {
            .name       = "RGB-16 (5/B-6/G-5/R)",
            .pixelformat      = V4L2_PIX_FMT_RGB565,
            .trans            = RGB16_COMPOSED,
            .depth            = 16,
            .flags            = 0,
      }, {
            .name       = "RGB-24 (B-G-R)",
            .pixelformat      = V4L2_PIX_FMT_BGR24,
            .trans            = RGB24_COMPOSED,
            .depth            = 24,
            .flags            = 0,
      }, {
            .name       = "RGB-32 (B-G-R)",
            .pixelformat      = V4L2_PIX_FMT_BGR32,
            .trans            = RGB32_COMPOSED,
            .depth            = 32,
            .flags            = 0,
      }, {
            .name       = "RGB-32 (R-G-B)",
            .pixelformat      = V4L2_PIX_FMT_RGB32,
            .trans            = RGB32_COMPOSED,
            .depth            = 32,
            .flags            = 0,
            .swap       = 0x2,
      }, {
            .name       = "Greyscale-8",
            .pixelformat      = V4L2_PIX_FMT_GREY,
            .trans            = Y8,
            .depth            = 8,
            .flags            = 0,
      }, {
            .name       = "YUV 4:2:2 planar (Y-Cb-Cr)",
            .pixelformat      = V4L2_PIX_FMT_YUV422P,
            .trans            = YUV422_DECOMPOSED,
            .depth            = 16,
            .flags            = FORMAT_BYTE_SWAP|FORMAT_IS_PLANAR,
      }, {
            .name       = "YVU 4:2:0 planar (Y-Cb-Cr)",
            .pixelformat      = V4L2_PIX_FMT_YVU420,
            .trans            = YUV420_DECOMPOSED,
            .depth            = 12,
            .flags            = FORMAT_BYTE_SWAP|FORMAT_IS_PLANAR,
      }, {
            .name       = "YUV 4:2:0 planar (Y-Cb-Cr)",
            .pixelformat      = V4L2_PIX_FMT_YUV420,
            .trans            = YUV420_DECOMPOSED,
            .depth            = 12,
            .flags            = FORMAT_IS_PLANAR,
      }, {
            .name       = "YUV 4:2:2 (U-Y-V-Y)",
            .pixelformat      = V4L2_PIX_FMT_UYVY,
            .trans            = YUV422_COMPOSED,
            .depth            = 16,
            .flags            = 0,
      }
};

/* unfortunately, the saa7146 contains a bug which prevents it from doing on-the-fly byte swaps.
   due to this, it's impossible to provide additional *packed* formats, which are simply byte swapped
   (like V4L2_PIX_FMT_YUYV) ... 8-( */

static int NUM_FORMATS = sizeof(formats)/sizeof(struct saa7146_format);

struct saa7146_format* format_by_fourcc(struct saa7146_dev *dev, int fourcc)
{
      int i, j = NUM_FORMATS;

      for (i = 0; i < j; i++) {
            if (formats[i].pixelformat == fourcc) {
                  return formats+i;
            }
      }

      DEB_D(("unknown pixelformat:'%4.4s'\n",(char *)&fourcc));
      return NULL;
}

static int g_fmt(struct saa7146_fh *fh, struct v4l2_format *f)
{
      struct saa7146_dev *dev = fh->dev;
      DEB_EE(("dev:%p, fh:%p\n",dev,fh));

      switch (f->type) {
      case V4L2_BUF_TYPE_VIDEO_CAPTURE:
            f->fmt.pix = fh->video_fmt;
            return 0;
      case V4L2_BUF_TYPE_VIDEO_OVERLAY:
            f->fmt.win = fh->ov.win;
            return 0;
      case V4L2_BUF_TYPE_VBI_CAPTURE:
      {
            f->fmt.vbi = fh->vbi_fmt;
            return 0;
      }
      default:
            DEB_D(("invalid format type '%d'.\n",f->type));
            return -EINVAL;
      }
}

static int try_win(struct saa7146_dev *dev, struct v4l2_window *win)
{
      struct saa7146_vv *vv = dev->vv_data;
      enum v4l2_field field;
      int maxw, maxh;

      DEB_EE(("dev:%p\n",dev));

      if (NULL == vv->ov_fb.base) {
            DEB_D(("no fb base set.\n"));
            return -EINVAL;
      }
      if (NULL == vv->ov_fmt) {
            DEB_D(("no fb fmt set.\n"));
            return -EINVAL;
      }
      if (win->w.width < 48 || win->w.height <  32) {
            DEB_D(("min width/height. (%d,%d)\n",win->w.width,win->w.height));
            return -EINVAL;
      }
      if (win->clipcount > 16) {
            DEB_D(("clipcount too big.\n"));
            return -EINVAL;
      }

      field = win->field;
      maxw  = vv->standard->h_max_out;
      maxh  = vv->standard->v_max_out;

      if (V4L2_FIELD_ANY == field) {
            field = (win->w.height > maxh/2)
                  ? V4L2_FIELD_INTERLACED
                  : V4L2_FIELD_TOP;
            }
      switch (field) {
      case V4L2_FIELD_TOP:
      case V4L2_FIELD_BOTTOM:
      case V4L2_FIELD_ALTERNATE:
            maxh = maxh / 2;
            break;
      case V4L2_FIELD_INTERLACED:
            break;
      default: {
            DEB_D(("no known field mode '%d'.\n",field));
            return -EINVAL;
      }
      }

      win->field = field;
      if (win->w.width > maxw)
            win->w.width = maxw;
      if (win->w.height > maxh)
            win->w.height = maxh;

      return 0;
}

static int try_fmt(struct saa7146_fh *fh, struct v4l2_format *f)
{
      struct saa7146_dev *dev = fh->dev;
      struct saa7146_vv *vv = dev->vv_data;
      int err;

      switch (f->type) {
      case V4L2_BUF_TYPE_VIDEO_CAPTURE:
      {
            struct saa7146_format *fmt;
            enum v4l2_field field;
            int maxw, maxh;
            int calc_bpl;

            DEB_EE(("V4L2_BUF_TYPE_VIDEO_CAPTURE: dev:%p, fh:%p\n",dev,fh));

            fmt = format_by_fourcc(dev,f->fmt.pix.pixelformat);
            if (NULL == fmt) {
                  return -EINVAL;
            }

            field = f->fmt.pix.field;
            maxw  = vv->standard->h_max_out;
            maxh  = vv->standard->v_max_out;

            if (V4L2_FIELD_ANY == field) {
                  field = (f->fmt.pix.height > maxh/2)
                        ? V4L2_FIELD_INTERLACED
                        : V4L2_FIELD_BOTTOM;
            }
            switch (field) {
            case V4L2_FIELD_ALTERNATE: {
                  vv->last_field = V4L2_FIELD_TOP;
                  maxh = maxh / 2;
                  break;
            }
            case V4L2_FIELD_TOP:
            case V4L2_FIELD_BOTTOM:
                  vv->last_field = V4L2_FIELD_INTERLACED;
                  maxh = maxh / 2;
                  break;
            case V4L2_FIELD_INTERLACED:
                  vv->last_field = V4L2_FIELD_INTERLACED;
                  break;
            default: {
                  DEB_D(("no known field mode '%d'.\n",field));
                  return -EINVAL;
            }
            }

            f->fmt.pix.field = field;
            if (f->fmt.pix.width > maxw)
                  f->fmt.pix.width = maxw;
            if (f->fmt.pix.height > maxh)
                  f->fmt.pix.height = maxh;

            calc_bpl = (f->fmt.pix.width * fmt->depth)/8;

            if (f->fmt.pix.bytesperline < calc_bpl)
                  f->fmt.pix.bytesperline = calc_bpl;

            if (f->fmt.pix.bytesperline > (2*PAGE_SIZE * fmt->depth)/8) /* arbitrary constraint */
                  f->fmt.pix.bytesperline = calc_bpl;

            f->fmt.pix.sizeimage = f->fmt.pix.bytesperline * f->fmt.pix.height;
            DEB_D(("w:%d, h:%d, bytesperline:%d, sizeimage:%d\n",f->fmt.pix.width,f->fmt.pix.height,f->fmt.pix.bytesperline,f->fmt.pix.sizeimage));

            return 0;
      }
      case V4L2_BUF_TYPE_VIDEO_OVERLAY:
            DEB_EE(("V4L2_BUF_TYPE_VIDEO_OVERLAY: dev:%p, fh:%p\n",dev,fh));
            err = try_win(dev,&f->fmt.win);
            if (0 != err) {
                  return err;
            }
            return 0;
      default:
            DEB_EE(("unknown format type '%d'\n",f->type));
            return -EINVAL;
      }
}

int saa7146_start_preview(struct saa7146_fh *fh)
{
      struct saa7146_dev *dev = fh->dev;
      struct saa7146_vv *vv = dev->vv_data;
      int ret = 0, err = 0;

      DEB_EE(("dev:%p, fh:%p\n",dev,fh));

      /* check if we have overlay informations */
      if( NULL == fh->ov.fh ) {
            DEB_D(("no overlay data available. try S_FMT first.\n"));
            return -EAGAIN;
      }

      /* check if streaming capture is running */
      if (IS_CAPTURE_ACTIVE(fh) != 0) {
            DEB_D(("streaming capture is active.\n"));
            return -EBUSY;
      }

      /* check if overlay is running */
      if (IS_OVERLAY_ACTIVE(fh) != 0) {
            if (vv->video_fh == fh) {
                  DEB_D(("overlay is already active.\n"));
                  return 0;
            }
            DEB_D(("overlay is already active in another open.\n"));
            return -EBUSY;
      }

      if (0 == saa7146_res_get(fh, RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP)) {
            DEB_D(("cannot get necessary overlay resources\n"));
            return -EBUSY;
      }

      err = try_win(dev,&fh->ov.win);
      if (0 != err) {
            saa7146_res_free(vv->video_fh, RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP);
            return -EBUSY;
      }

      vv->ov_data = &fh->ov;

      DEB_D(("%dx%d+%d+%d %s field=%s\n",
            fh->ov.win.w.width,fh->ov.win.w.height,
            fh->ov.win.w.left,fh->ov.win.w.top,
            vv->ov_fmt->name,v4l2_field_names[fh->ov.win.field]));

      if (0 != (ret = saa7146_enable_overlay(fh))) {
            DEB_D(("enabling overlay failed: %d\n",ret));
            saa7146_res_free(vv->video_fh, RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP);
            return ret;
      }

      vv->video_status = STATUS_OVERLAY;
      vv->video_fh = fh;

      return 0;
}
EXPORT_SYMBOL_GPL(saa7146_start_preview);

int saa7146_stop_preview(struct saa7146_fh *fh)
{
      struct saa7146_dev *dev = fh->dev;
      struct saa7146_vv *vv = dev->vv_data;

      DEB_EE(("dev:%p, fh:%p\n",dev,fh));

      /* check if streaming capture is running */
      if (IS_CAPTURE_ACTIVE(fh) != 0) {
            DEB_D(("streaming capture is active.\n"));
            return -EBUSY;
      }

      /* check if overlay is running at all */
      if ((vv->video_status & STATUS_OVERLAY) == 0) {
            DEB_D(("no active overlay.\n"));
            return 0;
      }

      if (vv->video_fh != fh) {
            DEB_D(("overlay is active, but in another open.\n"));
            return -EBUSY;
      }

      vv->video_status = 0;
      vv->video_fh = NULL;

      saa7146_disable_overlay(fh);

      saa7146_res_free(fh, RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP);

      return 0;
}
EXPORT_SYMBOL_GPL(saa7146_stop_preview);

static int s_fmt(struct saa7146_fh *fh, struct v4l2_format *f)
{
      struct saa7146_dev *dev = fh->dev;
      struct saa7146_vv *vv = dev->vv_data;

      int err;

      switch (f->type) {
      case V4L2_BUF_TYPE_VIDEO_CAPTURE:
            DEB_EE(("V4L2_BUF_TYPE_VIDEO_CAPTURE: dev:%p, fh:%p\n",dev,fh));
            if (IS_CAPTURE_ACTIVE(fh) != 0) {
                  DEB_EE(("streaming capture is active\n"));
                  return -EBUSY;
            }
            err = try_fmt(fh,f);
            if (0 != err)
                  return err;
            fh->video_fmt = f->fmt.pix;
            DEB_EE(("set to pixelformat '%4.4s'\n",(char *)&fh->video_fmt.pixelformat));
            return 0;
      case V4L2_BUF_TYPE_VIDEO_OVERLAY:
            DEB_EE(("V4L2_BUF_TYPE_VIDEO_OVERLAY: dev:%p, fh:%p\n",dev,fh));
            err = try_win(dev,&f->fmt.win);
            if (0 != err)
                  return err;
            mutex_lock(&dev->lock);
            fh->ov.win    = f->fmt.win;
            fh->ov.nclips = f->fmt.win.clipcount;
            if (fh->ov.nclips > 16)
                  fh->ov.nclips = 16;
            if (copy_from_user(fh->ov.clips,f->fmt.win.clips,sizeof(struct v4l2_clip)*fh->ov.nclips)) {
                  mutex_unlock(&dev->lock);
                  return -EFAULT;
            }

            /* fh->ov.fh is used to indicate that we have valid overlay informations, too */
            fh->ov.fh = fh;

            mutex_unlock(&dev->lock);

            /* check if our current overlay is active */
            if (IS_OVERLAY_ACTIVE(fh) != 0) {
                  saa7146_stop_preview(fh);
                  saa7146_start_preview(fh);
            }
            return 0;
      default:
            DEB_D(("unknown format type '%d'\n",f->type));
            return -EINVAL;
      }
}

/********************************************************************************/
/* device controls */

static struct v4l2_queryctrl controls[] = {
      {
            .id         = V4L2_CID_BRIGHTNESS,
            .name       = "Brightness",
            .minimum    = 0,
            .maximum    = 255,
            .step       = 1,
            .default_value    = 128,
            .type       = V4L2_CTRL_TYPE_INTEGER,
      },{
            .id         = V4L2_CID_CONTRAST,
            .name       = "Contrast",
            .minimum    = 0,
            .maximum    = 127,
            .step       = 1,
            .default_value    = 64,
            .type       = V4L2_CTRL_TYPE_INTEGER,
      },{
            .id         = V4L2_CID_SATURATION,
            .name       = "Saturation",
            .minimum    = 0,
            .maximum    = 127,
            .step       = 1,
            .default_value    = 64,
            .type       = V4L2_CTRL_TYPE_INTEGER,
      },{
            .id         = V4L2_CID_VFLIP,
            .name       = "Vertical flip",
            .minimum    = 0,
            .maximum    = 1,
            .type       = V4L2_CTRL_TYPE_BOOLEAN,
      },{
            .id         = V4L2_CID_HFLIP,
            .name       = "Horizontal flip",
            .minimum    = 0,
            .maximum    = 1,
            .type       = V4L2_CTRL_TYPE_BOOLEAN,
      },
};
static int NUM_CONTROLS = sizeof(controls)/sizeof(struct v4l2_queryctrl);

#define V4L2_CID_PRIVATE_LASTP1      (V4L2_CID_PRIVATE_BASE + 0)

static struct v4l2_queryctrl* ctrl_by_id(int id)
{
      int i;

      for (i = 0; i < NUM_CONTROLS; i++)
            if (controls[i].id == id)
                  return controls+i;
      return NULL;
}

static int get_control(struct saa7146_fh *fh, struct v4l2_control *c)
{
      struct saa7146_dev *dev = fh->dev;
      struct saa7146_vv *vv = dev->vv_data;

      const struct v4l2_queryctrl* ctrl;
      u32 value = 0;

      ctrl = ctrl_by_id(c->id);
      if (NULL == ctrl)
            return -EINVAL;
      switch (c->id) {
      case V4L2_CID_BRIGHTNESS:
            value = saa7146_read(dev, BCS_CTRL);
            c->value = 0xff & (value >> 24);
            DEB_D(("V4L2_CID_BRIGHTNESS: %d\n",c->value));
            break;
      case V4L2_CID_CONTRAST:
            value = saa7146_read(dev, BCS_CTRL);
            c->value = 0x7f & (value >> 16);
            DEB_D(("V4L2_CID_CONTRAST: %d\n",c->value));
            break;
      case V4L2_CID_SATURATION:
            value = saa7146_read(dev, BCS_CTRL);
            c->value = 0x7f & (value >> 0);
            DEB_D(("V4L2_CID_SATURATION: %d\n",c->value));
            break;
      case V4L2_CID_VFLIP:
            c->value = vv->vflip;
            DEB_D(("V4L2_CID_VFLIP: %d\n",c->value));
            break;
      case V4L2_CID_HFLIP:
            c->value = vv->hflip;
            DEB_D(("V4L2_CID_HFLIP: %d\n",c->value));
            break;
      default:
            return -EINVAL;
      }

      return 0;
}

static int set_control(struct saa7146_fh *fh, struct v4l2_control *c)
{
      struct saa7146_dev *dev = fh->dev;
      struct saa7146_vv *vv = dev->vv_data;

      const struct v4l2_queryctrl* ctrl;

      ctrl = ctrl_by_id(c->id);
      if (NULL == ctrl) {
            DEB_D(("unknown control %d\n",c->id));
            return -EINVAL;
      }

      mutex_lock(&dev->lock);

      switch (ctrl->type) {
      case V4L2_CTRL_TYPE_BOOLEAN:
      case V4L2_CTRL_TYPE_MENU:
      case V4L2_CTRL_TYPE_INTEGER:
            if (c->value < ctrl->minimum)
                  c->value = ctrl->minimum;
            if (c->value > ctrl->maximum)
                  c->value = ctrl->maximum;
            break;
      default:
            /* nothing */;
      };

      switch (c->id) {
      case V4L2_CID_BRIGHTNESS: {
            u32 value = saa7146_read(dev, BCS_CTRL);
            value &= 0x00ffffff;
            value |= (c->value << 24);
            saa7146_write(dev, BCS_CTRL, value);
            saa7146_write(dev, MC2, MASK_22 | MASK_06 );
            break;
      }
      case V4L2_CID_CONTRAST: {
            u32 value = saa7146_read(dev, BCS_CTRL);
            value &= 0xff00ffff;
            value |= (c->value << 16);
            saa7146_write(dev, BCS_CTRL, value);
            saa7146_write(dev, MC2, MASK_22 | MASK_06 );
            break;
      }
      case V4L2_CID_SATURATION: {
            u32 value = saa7146_read(dev, BCS_CTRL);
            value &= 0xffffff00;
            value |= (c->value << 0);
            saa7146_write(dev, BCS_CTRL, value);
            saa7146_write(dev, MC2, MASK_22 | MASK_06 );
            break;
      }
      case V4L2_CID_HFLIP:
            /* fixme: we can support changing VFLIP and HFLIP here... */
            if (IS_CAPTURE_ACTIVE(fh) != 0) {
                  DEB_D(("V4L2_CID_HFLIP while active capture.\n"));
                  mutex_unlock(&dev->lock);
                  return -EINVAL;
            }
            vv->hflip = c->value;
            break;
      case V4L2_CID_VFLIP:
            if (IS_CAPTURE_ACTIVE(fh) != 0) {
                  DEB_D(("V4L2_CID_VFLIP while active capture.\n"));
                  mutex_unlock(&dev->lock);
                  return -EINVAL;
            }
            vv->vflip = c->value;
            break;
      default: {
            return -EINVAL;
      }
      }
      mutex_unlock(&dev->lock);

      if (IS_OVERLAY_ACTIVE(fh) != 0) {
            saa7146_stop_preview(fh);
            saa7146_start_preview(fh);
      }
      return 0;
}

/********************************************************************************/
/* common pagetable functions */

static int saa7146_pgtable_build(struct saa7146_dev *dev, struct saa7146_buf *buf)
{
      struct pci_dev *pci = dev->pci;
      struct videobuf_dmabuf *dma=videobuf_to_dma(&buf->vb);
      struct scatterlist *list = dma->sglist;
      int length = dma->sglen;
      struct saa7146_format *sfmt = format_by_fourcc(dev,buf->fmt->pixelformat);

      DEB_EE(("dev:%p, buf:%p, sg_len:%d\n",dev,buf,length));

      if( 0 != IS_PLANAR(sfmt->trans)) {
            struct saa7146_pgtable *pt1 = &buf->pt[0];
            struct saa7146_pgtable *pt2 = &buf->pt[1];
            struct saa7146_pgtable *pt3 = &buf->pt[2];
            u32  *ptr1, *ptr2, *ptr3;
            u32 fill;

            int size = buf->fmt->width*buf->fmt->height;
            int i,p,m1,m2,m3,o1,o2;

            switch( sfmt->depth ) {
                  case 12: {
                        /* create some offsets inside the page table */
                        m1 = ((size+PAGE_SIZE)/PAGE_SIZE)-1;
                        m2 = ((size+(size/4)+PAGE_SIZE)/PAGE_SIZE)-1;
                        m3 = ((size+(size/2)+PAGE_SIZE)/PAGE_SIZE)-1;
                        o1 = size%PAGE_SIZE;
                        o2 = (size+(size/4))%PAGE_SIZE;
                        DEB_CAP(("size:%d, m1:%d, m2:%d, m3:%d, o1:%d, o2:%d\n",size,m1,m2,m3,o1,o2));
                        break;
                  }
                  case 16: {
                        /* create some offsets inside the page table */
                        m1 = ((size+PAGE_SIZE)/PAGE_SIZE)-1;
                        m2 = ((size+(size/2)+PAGE_SIZE)/PAGE_SIZE)-1;
                        m3 = ((2*size+PAGE_SIZE)/PAGE_SIZE)-1;
                        o1 = size%PAGE_SIZE;
                        o2 = (size+(size/2))%PAGE_SIZE;
                        DEB_CAP(("size:%d, m1:%d, m2:%d, m3:%d, o1:%d, o2:%d\n",size,m1,m2,m3,o1,o2));
                        break;
                  }
                  default: {
                        return -1;
                  }
            }

            ptr1 = pt1->cpu;
            ptr2 = pt2->cpu;
            ptr3 = pt3->cpu;

            /* walk all pages, copy all page addresses to ptr1 */
            for (i = 0; i < length; i++, list++) {
                  for (p = 0; p * 4096 < list->length; p++, ptr1++) {
                        *ptr1 = cpu_to_le32(sg_dma_address(list) - list->offset);
                  }
            }
/*
            ptr1 = pt1->cpu;
            for(j=0;j<40;j++) {
                  printk("ptr1 %d: 0x%08x\n",j,ptr1[j]);
            }
*/

            /* if we have a user buffer, the first page may not be
               aligned to a page boundary. */
            pt1->offset = list->offset;
            pt2->offset = pt1->offset+o1;
            pt3->offset = pt1->offset+o2;

            /* create video-dma2 page table */
            ptr1 = pt1->cpu;
            for(i = m1; i <= m2 ; i++, ptr2++) {
                  *ptr2 = ptr1[i];
            }
            fill = *(ptr2-1);
            for(;i<1024;i++,ptr2++) {
                  *ptr2 = fill;
            }
            /* create video-dma3 page table */
            ptr1 = pt1->cpu;
            for(i = m2; i <= m3; i++,ptr3++) {
                  *ptr3 = ptr1[i];
            }
            fill = *(ptr3-1);
            for(;i<1024;i++,ptr3++) {
                  *ptr3 = fill;
            }
            /* finally: finish up video-dma1 page table */
            ptr1 = pt1->cpu+m1;
            fill = pt1->cpu[m1];
            for(i=m1;i<1024;i++,ptr1++) {
                  *ptr1 = fill;
            }
/*
            ptr1 = pt1->cpu;
            ptr2 = pt2->cpu;
            ptr3 = pt3->cpu;
            for(j=0;j<40;j++) {
                  printk("ptr1 %d: 0x%08x\n",j,ptr1[j]);
            }
            for(j=0;j<40;j++) {
                  printk("ptr2 %d: 0x%08x\n",j,ptr2[j]);
            }
            for(j=0;j<40;j++) {
                  printk("ptr3 %d: 0x%08x\n",j,ptr3[j]);
            }
*/
      } else {
            struct saa7146_pgtable *pt = &buf->pt[0];
            return saa7146_pgtable_build_single(pci, pt, list, length);
      }

      return 0;
}


/********************************************************************************/
/* file operations */

static int video_begin(struct saa7146_fh *fh)
{
      struct saa7146_dev *dev = fh->dev;
      struct saa7146_vv *vv = dev->vv_data;
      struct saa7146_format *fmt = NULL;
      unsigned int resource;
      int ret = 0, err = 0;

      DEB_EE(("dev:%p, fh:%p\n",dev,fh));

      if ((vv->video_status & STATUS_CAPTURE) != 0) {
            if (vv->video_fh == fh) {
                  DEB_S(("already capturing.\n"));
                  return 0;
            }
            DEB_S(("already capturing in another open.\n"));
            return -EBUSY;
      }

      if ((vv->video_status & STATUS_OVERLAY) != 0) {
            DEB_S(("warning: suspending overlay video for streaming capture.\n"));
            vv->ov_suspend = vv->video_fh;
            err = saa7146_stop_preview(vv->video_fh); /* side effect: video_status is now 0, video_fh is NULL */
            if (0 != err) {
                  DEB_D(("suspending video failed. aborting\n"));
                  return err;
            }
      }

      fmt = format_by_fourcc(dev,fh->video_fmt.pixelformat);
      /* we need to have a valid format set here */
      BUG_ON(NULL == fmt);

      if (0 != (fmt->flags & FORMAT_IS_PLANAR)) {
            resource = RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP|RESOURCE_DMA3_BRS;
      } else {
            resource = RESOURCE_DMA1_HPS;
      }

      ret = saa7146_res_get(fh, resource);
      if (0 == ret) {
            DEB_S(("cannot get capture resource %d\n",resource));
            if (vv->ov_suspend != NULL) {
                  saa7146_start_preview(vv->ov_suspend);
                  vv->ov_suspend = NULL;
            }
            return -EBUSY;
      }

      /* clear out beginning of streaming bit (rps register 0)*/
      saa7146_write(dev, MC2, MASK_27 );

      /* enable rps0 irqs */
      SAA7146_IER_ENABLE(dev, MASK_27);

      vv->video_fh = fh;
      vv->video_status = STATUS_CAPTURE;

      return 0;
}

static int video_end(struct saa7146_fh *fh, struct file *file)
{
      struct saa7146_dev *dev = fh->dev;
      struct saa7146_vv *vv = dev->vv_data;
      struct saa7146_format *fmt = NULL;
      unsigned long flags;
      unsigned int resource;
      u32 dmas = 0;
      DEB_EE(("dev:%p, fh:%p\n",dev,fh));

      if ((vv->video_status & STATUS_CAPTURE) != STATUS_CAPTURE) {
            DEB_S(("not capturing.\n"));
            return 0;
      }

      if (vv->video_fh != fh) {
            DEB_S(("capturing, but in another open.\n"));
            return -EBUSY;
      }

      fmt = format_by_fourcc(dev,fh->video_fmt.pixelformat);
      /* we need to have a valid format set here */
      BUG_ON(NULL == fmt);

      if (0 != (fmt->flags & FORMAT_IS_PLANAR)) {
            resource = RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP|RESOURCE_DMA3_BRS;
            dmas = MASK_22 | MASK_21 | MASK_20;
      } else {
            resource = RESOURCE_DMA1_HPS;
            dmas = MASK_22;
      }
      spin_lock_irqsave(&dev->slock,flags);

      /* disable rps0  */
      saa7146_write(dev, MC1, MASK_28);

      /* disable rps0 irqs */
      SAA7146_IER_DISABLE(dev, MASK_27);

      /* shut down all used video dma transfers */
      saa7146_write(dev, MC1, dmas);

      spin_unlock_irqrestore(&dev->slock, flags);

      vv->video_fh = NULL;
      vv->video_status = 0;

      saa7146_res_free(fh, resource);

      if (vv->ov_suspend != NULL) {
            saa7146_start_preview(vv->ov_suspend);
            vv->ov_suspend = NULL;
      }

      return 0;
}

/*
 * This function is _not_ called directly, but from
 * video_generic_ioctl (and maybe others).  userspace
 * copying is done already, arg is a kernel pointer.
 */

int saa7146_video_do_ioctl(struct inode *inode, struct file *file, unsigned int cmd, void *arg)
{
      struct saa7146_fh *fh  = file->private_data;
      struct saa7146_dev *dev = fh->dev;
      struct saa7146_vv *vv = dev->vv_data;

      int err = 0, result = 0, ee = 0;

      struct saa7146_use_ops *ops;
      struct videobuf_queue *q;

      /* check if extension handles the command */
      for(ee = 0; dev->ext_vv_data->ioctls[ee].flags != 0; ee++) {
            if( cmd == dev->ext_vv_data->ioctls[ee].cmd )
                  break;
      }

      if( 0 != (dev->ext_vv_data->ioctls[ee].flags & SAA7146_EXCLUSIVE) ) {
            DEB_D(("extension handles ioctl exclusive.\n"));
            result = dev->ext_vv_data->ioctl(fh, cmd, arg);
            return result;
      }
      if( 0 != (dev->ext_vv_data->ioctls[ee].flags & SAA7146_BEFORE) ) {
            DEB_D(("extension handles ioctl before.\n"));
            result = dev->ext_vv_data->ioctl(fh, cmd, arg);
            if( -EAGAIN != result ) {
                  return result;
            }
      }

      /* fixme: add handle "after" case (is it still needed?) */

      switch (fh->type) {
      case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
            ops = &saa7146_video_uops;
            q = &fh->video_q;
            break;
            }
      case V4L2_BUF_TYPE_VBI_CAPTURE: {
            ops = &saa7146_vbi_uops;
            q = &fh->vbi_q;
            break;
            }
      default:
            BUG();
            return 0;
      }

      switch (cmd) {
      case VIDIOC_QUERYCAP:
      {
            struct v4l2_capability *cap = arg;
            memset(cap,0,sizeof(*cap));

            DEB_EE(("VIDIOC_QUERYCAP\n"));

            strcpy((char *)cap->driver, "saa7146 v4l2");
            strlcpy((char *)cap->card, dev->ext->name, sizeof(cap->card));
            sprintf((char *)cap->bus_info,"PCI:%s", pci_name(dev->pci));
            cap->version = SAA7146_VERSION_CODE;
            cap->capabilities =
                  V4L2_CAP_VIDEO_CAPTURE |
                  V4L2_CAP_VIDEO_OVERLAY |
                  V4L2_CAP_READWRITE |
                  V4L2_CAP_STREAMING;
            cap->capabilities |= dev->ext_vv_data->capabilities;
            return 0;
      }
      case VIDIOC_G_FBUF:
      {
            struct v4l2_framebuffer *fb = arg;

            DEB_EE(("VIDIOC_G_FBUF\n"));

            *fb = vv->ov_fb;
            fb->capability = V4L2_FBUF_CAP_LIST_CLIPPING;
            return 0;
      }
      case VIDIOC_S_FBUF:
      {
            struct v4l2_framebuffer *fb = arg;
            struct saa7146_format *fmt;

            DEB_EE(("VIDIOC_S_FBUF\n"));

            if(!capable(CAP_SYS_ADMIN) &&
               !capable(CAP_SYS_RAWIO))
                  return -EPERM;

            /* check args */
            fmt = format_by_fourcc(dev,fb->fmt.pixelformat);
            if (NULL == fmt) {
                  return -EINVAL;
            }

            /* planar formats are not allowed for overlay video, clipping and video dma would clash */
            if (0 != (fmt->flags & FORMAT_IS_PLANAR)) {
                  DEB_S(("planar pixelformat '%4.4s' not allowed for overlay\n",(char *)&fmt->pixelformat));
            }

            /* check if overlay is running */
            if (IS_OVERLAY_ACTIVE(fh) != 0) {
                  if (vv->video_fh != fh) {
                        DEB_D(("refusing to change framebuffer informations while overlay is active in another open.\n"));
                        return -EBUSY;
                  }
            }

            mutex_lock(&dev->lock);

            /* ok, accept it */
            vv->ov_fb = *fb;
            vv->ov_fmt = fmt;
            if (0 == vv->ov_fb.fmt.bytesperline)
                  vv->ov_fb.fmt.bytesperline =
                        vv->ov_fb.fmt.width*fmt->depth/8;

            mutex_unlock(&dev->lock);

            return 0;
      }
      case VIDIOC_ENUM_FMT:
      {
            struct v4l2_fmtdesc *f = arg;
            int index;

            switch (f->type) {
            case V4L2_BUF_TYPE_VIDEO_CAPTURE:
            case V4L2_BUF_TYPE_VIDEO_OVERLAY: {
                  index = f->index;
                  if (index < 0 || index >= NUM_FORMATS) {
                        return -EINVAL;
                  }
                  memset(f,0,sizeof(*f));
                  f->index = index;
                  strlcpy((char *)f->description,formats[index].name,sizeof(f->description));
                  f->pixelformat = formats[index].pixelformat;
                  break;
            }
            default:
                  return -EINVAL;
            }

            DEB_EE(("VIDIOC_ENUM_FMT: type:%d, index:%d\n",f->type,f->index));
            return 0;
      }
      case VIDIOC_QUERYCTRL:
      {
            const struct v4l2_queryctrl *ctrl;
            struct v4l2_queryctrl *c = arg;

            if ((c->id <  V4L2_CID_BASE ||
                 c->id >= V4L2_CID_LASTP1) &&
                (c->id <  V4L2_CID_PRIVATE_BASE ||
                 c->id >= V4L2_CID_PRIVATE_LASTP1))
                  return -EINVAL;

            ctrl = ctrl_by_id(c->id);
            if( NULL == ctrl ) {
                  return -EINVAL;
/*
                  c->flags = V4L2_CTRL_FLAG_DISABLED;
                  return 0;
*/
            }

            DEB_EE(("VIDIOC_QUERYCTRL: id:%d\n",c->id));
            *c = *ctrl;
            return 0;
      }
      case VIDIOC_G_CTRL: {
            DEB_EE(("VIDIOC_G_CTRL\n"));
            return get_control(fh,arg);
      }
      case VIDIOC_S_CTRL:
      {
            DEB_EE(("VIDIOC_S_CTRL\n"));
            err = set_control(fh,arg);
            return err;
      }
      case VIDIOC_G_PARM:
      {
            struct v4l2_streamparm *parm = arg;
            if( parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ) {
                  return -EINVAL;
            }
            memset(&parm->parm.capture,0,sizeof(struct v4l2_captureparm));
            parm->parm.capture.readbuffers = 1;
            // fixme: only for PAL!
            parm->parm.capture.timeperframe.numerator = 1;
            parm->parm.capture.timeperframe.denominator = 25;
            return 0;
      }
      case VIDIOC_G_FMT:
      {
            struct v4l2_format *f = arg;
            DEB_EE(("VIDIOC_G_FMT\n"));
            return g_fmt(fh,f);
      }
      case VIDIOC_S_FMT:
      {
            struct v4l2_format *f = arg;
            DEB_EE(("VIDIOC_S_FMT\n"));
            return s_fmt(fh,f);
      }
      case VIDIOC_TRY_FMT:
      {
            struct v4l2_format *f = arg;
            DEB_EE(("VIDIOC_TRY_FMT\n"));
            return try_fmt(fh,f);
      }
      case VIDIOC_G_STD:
      {
            v4l2_std_id *id = arg;
            DEB_EE(("VIDIOC_G_STD\n"));
            *id = vv->standard->id;
            return 0;
      }
      /* the saa7146 supfhrts (used in conjunction with the saa7111a for example)
         PAL / NTSC / SECAM. if your hardware does not (or does more)
         -- override this function in your extension */
      case VIDIOC_ENUMSTD:
      {
            struct v4l2_standard *e = arg;
            if (e->index < 0 )
                  return -EINVAL;
            if( e->index < dev->ext_vv_data->num_stds ) {
                  DEB_EE(("VIDIOC_ENUMSTD: index:%d\n",e->index));
                  v4l2_video_std_construct(e, dev->ext_vv_data->stds[e->index].id, dev->ext_vv_data->stds[e->index].name);
                  return 0;
            }
            return -EINVAL;
      }
      case VIDIOC_S_STD:
      {
            v4l2_std_id *id = arg;
            int found = 0;
            int i, err;

            DEB_EE(("VIDIOC_S_STD\n"));

            if ((vv->video_status & STATUS_CAPTURE) == STATUS_CAPTURE) {
                  DEB_D(("cannot change video standard while streaming capture is active\n"));
                  return -EBUSY;
            }

            if ((vv->video_status & STATUS_OVERLAY) != 0) {
                  vv->ov_suspend = vv->video_fh;
                  err = saa7146_stop_preview(vv->video_fh); /* side effect: video_status is now 0, video_fh is NULL */
                  if (0 != err) {
                        DEB_D(("suspending video failed. aborting\n"));
                        return err;
                  }
            }

            mutex_lock(&dev->lock);

            for(i = 0; i < dev->ext_vv_data->num_stds; i++)
                  if (*id & dev->ext_vv_data->stds[i].id)
                        break;
            if (i != dev->ext_vv_data->num_stds) {
                  vv->standard = &dev->ext_vv_data->stds[i];
                  if( NULL != dev->ext_vv_data->std_callback )
                        dev->ext_vv_data->std_callback(dev, vv->standard);
                  found = 1;
            }

            mutex_unlock(&dev->lock);

            if (vv->ov_suspend != NULL) {
                  saa7146_start_preview(vv->ov_suspend);
                  vv->ov_suspend = NULL;
            }

            if( 0 == found ) {
                  DEB_EE(("VIDIOC_S_STD: standard not found.\n"));
                  return -EINVAL;
            }

            DEB_EE(("VIDIOC_S_STD: set to standard to '%s'\n",vv->standard->name));
            return 0;
      }
      case VIDIOC_OVERLAY:
      {
            int on = *(int *)arg;
            int err = 0;

            DEB_D(("VIDIOC_OVERLAY on:%d\n",on));
            if (on != 0) {
                  err = saa7146_start_preview(fh);
            } else {
                  err = saa7146_stop_preview(fh);
            }
            return err;
      }
      case VIDIOC_REQBUFS: {
            struct v4l2_requestbuffers *req = arg;
            DEB_D(("VIDIOC_REQBUFS, type:%d\n",req->type));
            return videobuf_reqbufs(q,req);
      }
      case VIDIOC_QUERYBUF: {
            struct v4l2_buffer *buf = arg;
            DEB_D(("VIDIOC_QUERYBUF, type:%d, offset:%d\n",buf->type,buf->m.offset));
            return videobuf_querybuf(q,buf);
      }
      case VIDIOC_QBUF: {
            struct v4l2_buffer *buf = arg;
            int ret = 0;
            ret = videobuf_qbuf(q,buf);
            DEB_D(("VIDIOC_QBUF: ret:%d, index:%d\n",ret,buf->index));
            return ret;
      }
      case VIDIOC_DQBUF: {
            struct v4l2_buffer *buf = arg;
            int ret = 0;
            ret = videobuf_dqbuf(q,buf,file->f_flags & O_NONBLOCK);
            DEB_D(("VIDIOC_DQBUF: ret:%d, index:%d\n",ret,buf->index));
            return ret;
      }
      case VIDIOC_STREAMON: {
            int *type = arg;
            DEB_D(("VIDIOC_STREAMON, type:%d\n",*type));

            err = video_begin(fh);
            if( 0 != err) {
                  return err;
            }
            err = videobuf_streamon(q);
            return err;
      }
      case VIDIOC_STREAMOFF: {
            int *type = arg;

            DEB_D(("VIDIOC_STREAMOFF, type:%d\n",*type));

            /* ugly: we need to copy some checks from video_end(),
               because videobuf_streamoff() relies on the capture running.
               check and fix this */
            if ((vv->video_status & STATUS_CAPTURE) != STATUS_CAPTURE) {
                  DEB_S(("not capturing.\n"));
                  return 0;
            }

            if (vv->video_fh != fh) {
                  DEB_S(("capturing, but in another open.\n"));
                  return -EBUSY;
            }

            err = videobuf_streamoff(q);
            if (0 != err) {
                  DEB_D(("warning: videobuf_streamoff() failed.\n"));
                  video_end(fh, file);
            } else {
                  err = video_end(fh, file);
            }
            return err;
      }
#ifdef CONFIG_VIDEO_V4L1_COMPAT
      case VIDIOCGMBUF:
      {
            struct video_mbuf *mbuf = arg;
            struct videobuf_queue *q;
            int i;

            /* fixme: number of capture buffers and sizes for v4l apps */
            int gbuffers = 2;
            int gbufsize = 768*576*4;

            DEB_D(("VIDIOCGMBUF \n"));

            q = &fh->video_q;
            err = videobuf_mmap_setup(q,gbuffers,gbufsize,
                                V4L2_MEMORY_MMAP);
            if (err < 0)
                  return err;

            gbuffers = err;
            memset(mbuf,0,sizeof(*mbuf));
            mbuf->frames = gbuffers;
            mbuf->size   = gbuffers * gbufsize;
            for (i = 0; i < gbuffers; i++)
                  mbuf->offsets[i] = i * gbufsize;
            return 0;
      }
#endif
      default:
            return v4l_compat_translate_ioctl(inode,file,cmd,arg,
                                      saa7146_video_do_ioctl);
      }
      return 0;
}

/*********************************************************************************/
/* buffer handling functions                                                  */

static int buffer_activate (struct saa7146_dev *dev,
                 struct saa7146_buf *buf,
                 struct saa7146_buf *next)
{
      struct saa7146_vv *vv = dev->vv_data;

      buf->vb.state = STATE_ACTIVE;
      saa7146_set_capture(dev,buf,next);

      mod_timer(&vv->video_q.timeout, jiffies+BUFFER_TIMEOUT);
      return 0;
}

static int buffer_prepare(struct videobuf_queue *q,
                    struct videobuf_buffer *vb, enum v4l2_field field)
{
      struct file *file = q->priv_data;
      struct saa7146_fh *fh = file->private_data;
      struct saa7146_dev *dev = fh->dev;
      struct saa7146_vv *vv = dev->vv_data;
      struct saa7146_buf *buf = (struct saa7146_buf *)vb;
      int size,err = 0;

      DEB_CAP(("vbuf:%p\n",vb));

      /* sanity checks */
      if (fh->video_fmt.width  < 48 ||
          fh->video_fmt.height < 32 ||
          fh->video_fmt.width  > vv->standard->h_max_out ||
          fh->video_fmt.height > vv->standard->v_max_out) {
            DEB_D(("w (%d) / h (%d) out of bounds.\n",fh->video_fmt.width,fh->video_fmt.height));
            return -EINVAL;
      }

      size = fh->video_fmt.sizeimage;
      if (0 != buf->vb.baddr && buf->vb.bsize < size) {
            DEB_D(("size mismatch.\n"));
            return -EINVAL;
      }

      DEB_CAP(("buffer_prepare [size=%dx%d,bytes=%d,fields=%s]\n",
            fh->video_fmt.width,fh->video_fmt.height,size,v4l2_field_names[fh->video_fmt.field]));
      if (buf->vb.width  != fh->video_fmt.width  ||
          buf->vb.bytesperline != fh->video_fmt.bytesperline ||
          buf->vb.height != fh->video_fmt.height ||
          buf->vb.size   != size ||
          buf->vb.field  != field      ||
          buf->vb.field  != fh->video_fmt.field  ||
          buf->fmt       != &fh->video_fmt) {
            saa7146_dma_free(dev,q,buf);
      }

      if (STATE_NEEDS_INIT == buf->vb.state) {
            struct saa7146_format *sfmt;

            buf->vb.bytesperline  = fh->video_fmt.bytesperline;
            buf->vb.width  = fh->video_fmt.width;
            buf->vb.height = fh->video_fmt.height;
            buf->vb.size   = size;
            buf->vb.field  = field;
            buf->fmt       = &fh->video_fmt;
            buf->vb.field  = fh->video_fmt.field;

            sfmt = format_by_fourcc(dev,buf->fmt->pixelformat);

            if( 0 != IS_PLANAR(sfmt->trans)) {
                  saa7146_pgtable_free(dev->pci, &buf->pt[0]);
                  saa7146_pgtable_free(dev->pci, &buf->pt[1]);
                  saa7146_pgtable_free(dev->pci, &buf->pt[2]);

                  saa7146_pgtable_alloc(dev->pci, &buf->pt[0]);
                  saa7146_pgtable_alloc(dev->pci, &buf->pt[1]);
                  saa7146_pgtable_alloc(dev->pci, &buf->pt[2]);
            } else {
                  saa7146_pgtable_free(dev->pci, &buf->pt[0]);
                  saa7146_pgtable_alloc(dev->pci, &buf->pt[0]);
            }

            err = videobuf_iolock(q,&buf->vb, &vv->ov_fb);
            if (err)
                  goto oops;
            err = saa7146_pgtable_build(dev,buf);
            if (err)
                  goto oops;
      }
      buf->vb.state = STATE_PREPARED;
      buf->activate = buffer_activate;

      return 0;

 oops:
      DEB_D(("error out.\n"));
      saa7146_dma_free(dev,q,buf);

      return err;
}

static int buffer_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size)
{
      struct file *file = q->priv_data;
      struct saa7146_fh *fh = file->private_data;

      if (0 == *count || *count > MAX_SAA7146_CAPTURE_BUFFERS)
            *count = MAX_SAA7146_CAPTURE_BUFFERS;

      *size = fh->video_fmt.sizeimage;

      /* check if we exceed the "max_memory" parameter */
      if( (*count * *size) > (max_memory*1048576) ) {
            *count = (max_memory*1048576) / *size;
      }

      DEB_CAP(("%d buffers, %d bytes each.\n",*count,*size));

      return 0;
}

static void buffer_queue(struct videobuf_queue *q, struct videobuf_buffer *vb)
{
      struct file *file = q->priv_data;
      struct saa7146_fh *fh = file->private_data;
      struct saa7146_dev *dev = fh->dev;
      struct saa7146_vv *vv = dev->vv_data;
      struct saa7146_buf *buf = (struct saa7146_buf *)vb;

      DEB_CAP(("vbuf:%p\n",vb));
      saa7146_buffer_queue(fh->dev,&vv->video_q,buf);
}

static void buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
{
      struct file *file = q->priv_data;
      struct saa7146_fh *fh = file->private_data;
      struct saa7146_dev *dev = fh->dev;
      struct saa7146_buf *buf = (struct saa7146_buf *)vb;

      DEB_CAP(("vbuf:%p\n",vb));
      saa7146_dma_free(dev,q,buf);
}

static struct videobuf_queue_ops video_qops = {
      .buf_setup    = buffer_setup,
      .buf_prepare  = buffer_prepare,
      .buf_queue    = buffer_queue,
      .buf_release  = buffer_release,
};

/********************************************************************************/
/* file operations */

static void video_init(struct saa7146_dev *dev, struct saa7146_vv *vv)
{
      INIT_LIST_HEAD(&vv->video_q.queue);

      init_timer(&vv->video_q.timeout);
      vv->video_q.timeout.function = saa7146_buffer_timeout;
      vv->video_q.timeout.data     = (unsigned long)(&vv->video_q);
      vv->video_q.dev              = dev;

      /* set some default values */
      vv->standard = &dev->ext_vv_data->stds[0];

      /* FIXME: what's this? */
      vv->current_hps_source = SAA7146_HPS_SOURCE_PORT_A;
      vv->current_hps_sync = SAA7146_HPS_SYNC_PORT_A;
}


static int video_open(struct saa7146_dev *dev, struct file *file)
{
      struct saa7146_fh *fh = (struct saa7146_fh *)file->private_data;
      struct saa7146_format *sfmt;

      fh->video_fmt.width = 384;
      fh->video_fmt.height = 288;
      fh->video_fmt.pixelformat = V4L2_PIX_FMT_BGR24;
      fh->video_fmt.bytesperline = 0;
      fh->video_fmt.field = V4L2_FIELD_ANY;
      sfmt = format_by_fourcc(dev,fh->video_fmt.pixelformat);
      fh->video_fmt.sizeimage = (fh->video_fmt.width * fh->video_fmt.height * sfmt->depth)/8;

      videobuf_queue_pci_init(&fh->video_q, &video_qops,
                      dev->pci, &dev->slock,
                      V4L2_BUF_TYPE_VIDEO_CAPTURE,
                      V4L2_FIELD_INTERLACED,
                      sizeof(struct saa7146_buf),
                      file);

      mutex_init(&fh->video_q.lock);

      return 0;
}


static void video_close(struct saa7146_dev *dev, struct file *file)
{
      struct saa7146_fh *fh = (struct saa7146_fh *)file->private_data;
      struct saa7146_vv *vv = dev->vv_data;
      struct videobuf_queue *q = &fh->video_q;
      int err;

      if (IS_CAPTURE_ACTIVE(fh) != 0) {
            err = video_end(fh, file);
      } else if (IS_OVERLAY_ACTIVE(fh) != 0) {
            err = saa7146_stop_preview(fh);
      }

      videobuf_stop(q);

      /* hmm, why is this function declared void? */
      /* return err */
}


static void video_irq_done(struct saa7146_dev *dev, unsigned long st)
{
      struct saa7146_vv *vv = dev->vv_data;
      struct saa7146_dmaqueue *q = &vv->video_q;

      spin_lock(&dev->slock);
      DEB_CAP(("called.\n"));

      /* only finish the buffer if we have one... */
      if( NULL != q->curr ) {
            saa7146_buffer_finish(dev,q,STATE_DONE);
      }
      saa7146_buffer_next(dev,q,0);

      spin_unlock(&dev->slock);
}

static ssize_t video_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
{
      struct saa7146_fh *fh = file->private_data;
      struct saa7146_dev *dev = fh->dev;
      struct saa7146_vv *vv = dev->vv_data;
      ssize_t ret = 0;

      DEB_EE(("called.\n"));

      if ((vv->video_status & STATUS_CAPTURE) != 0) {
            /* fixme: should we allow read() captures while streaming capture? */
            if (vv->video_fh == fh) {
                  DEB_S(("already capturing.\n"));
                  return -EBUSY;
            }
            DEB_S(("already capturing in another open.\n"));
            return -EBUSY;
      }

      ret = video_begin(fh);
      if( 0 != ret) {
            goto out;
      }

      ret = videobuf_read_one(&fh->video_q , data, count, ppos,
                        file->f_flags & O_NONBLOCK);
      if (ret != 0) {
            video_end(fh, file);
      } else {
            ret = video_end(fh, file);
      }
out:
      /* restart overlay if it was active before */
      if (vv->ov_suspend != NULL) {
            saa7146_start_preview(vv->ov_suspend);
            vv->ov_suspend = NULL;
      }

      return ret;
}

struct saa7146_use_ops saa7146_video_uops = {
      .init = video_init,
      .open = video_open,
      .release = video_close,
      .irq_done = video_irq_done,
      .read = video_read,
};

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