Added missing tegra files.HEADmaster

1 files changed, 1429 insertions, 0 deletions

diff --git a/drivers/media/common/saa7146_video.c b/drivers/media/common/saa7146_video.c
new file mode 100644
index 00000000000..9aafa4e969a
--- /dev/null
+++ b/drivers/media/common/saa7146_video.c
@@ -0,0 +1,1429 @@
+#include <media/saa7146_vv.h>
+#include <media/v4l2-chip-ident.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* saa7146_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 vidioc_try_fmt_vid_overlay(struct file *file, void *fh, struct v4l2_format *f);
+
+int saa7146_start_preview(struct saa7146_fh *fh)
+{
+        struct saa7146_dev *dev = fh->dev;
+        struct saa7146_vv *vv = dev->vv_data;
+        struct v4l2_format fmt;
+        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;
+        }
+
+        fmt.fmt.win = fh->ov.win;
+        err = vidioc_try_fmt_vid_overlay(NULL, fh, &fmt);
+        if (0 != err) {
+                saa7146_res_free(vv->video_fh, RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP);
+                return -EBUSY;
+        }
+        fh->ov.win = fmt.fmt.win;
+        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);
+
+/********************************************************************************/
+/* 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,
+                .flags          = V4L2_CTRL_FLAG_SLIDER,
+        },{
+                .id             = V4L2_CID_CONTRAST,
+                .name           = "Contrast",
+                .minimum        = 0,
+                .maximum        = 127,
+                .step           = 1,
+                .default_value  = 64,
+                .type           = V4L2_CTRL_TYPE_INTEGER,
+                .flags          = V4L2_CTRL_FLAG_SLIDER,
+        },{
+                .id             = V4L2_CID_SATURATION,
+                .name           = "Saturation",
+                .minimum        = 0,
+                .maximum        = 127,
+                .step           = 1,
+                .default_value  = 64,
+                .type           = V4L2_CTRL_TYPE_INTEGER,
+                .flags          = V4L2_CTRL_FLAG_SLIDER,
+        },{
+                .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;
+}
+
+/********************************************************************************/
+/* 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 = saa7146_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];
+                __le32  *ptr1, *ptr2, *ptr3;
+                __le32 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 = dma->sglist->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 = saa7146_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 = saa7146_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;
+}
+
+static int vidioc_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
+{
+        struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
+
+        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;
+}
+
+static int vidioc_g_fbuf(struct file *file, void *fh, struct v4l2_framebuffer *fb)
+{
+        struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
+        struct saa7146_vv *vv = dev->vv_data;
+
+        *fb = vv->ov_fb;
+        fb->capability = V4L2_FBUF_CAP_LIST_CLIPPING;
+        return 0;
+}
+
+static int vidioc_s_fbuf(struct file *file, void *fh, struct v4l2_framebuffer *fb)
+{
+        struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
+        struct saa7146_vv *vv = dev->vv_data;
+        struct saa7146_format *fmt;
+
+        DEB_EE(("VIDIOC_S_FBUF\n"));
+
+        if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
+                return -EPERM;
+
+        /* check args */
+        fmt = saa7146_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 (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;
+                }
+        }
+
+        /* ok, accept it */
+        vv->ov_fb = *fb;
+        vv->ov_fmt = fmt;
+
+        if (vv->ov_fb.fmt.bytesperline < vv->ov_fb.fmt.width) {
+                vv->ov_fb.fmt.bytesperline = vv->ov_fb.fmt.width * fmt->depth / 8;
+                DEB_D(("setting bytesperline to %d\n", vv->ov_fb.fmt.bytesperline));
+        }
+        return 0;
+}
+
+static int vidioc_enum_fmt_vid_cap(struct file *file, void *fh, struct v4l2_fmtdesc *f)
+{
+        if (f->index >= NUM_FORMATS)
+                return -EINVAL;
+        strlcpy((char *)f->description, formats[f->index].name,
+                        sizeof(f->description));
+        f->pixelformat = formats[f->index].pixelformat;
+        return 0;
+}
+
+static int vidioc_queryctrl(struct file *file, void *fh, struct v4l2_queryctrl *c)
+{
+        const struct v4l2_queryctrl *ctrl;
+
+        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 (ctrl == NULL)
+                return -EINVAL;
+
+        DEB_EE(("VIDIOC_QUERYCTRL: id:%d\n", c->id));
+        *c = *ctrl;
+        return 0;
+}
+
+static int vidioc_g_ctrl(struct file *file, void *fh, struct v4l2_control *c)
+{
+        struct saa7146_dev *dev = ((struct saa7146_fh *)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 vidioc_s_ctrl(struct file *file, void *fh, struct v4l2_control *c)
+{
+        struct saa7146_dev *dev = ((struct saa7146_fh *)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;
+        }
+
+        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"));
+                        return -EBUSY;
+                }
+                vv->hflip = c->value;
+                break;
+        case V4L2_CID_VFLIP:
+                if (IS_CAPTURE_ACTIVE(fh) != 0) {
+                        DEB_D(("V4L2_CID_VFLIP while active capture.\n"));
+                        return -EBUSY;
+                }
+                vv->vflip = c->value;
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        if (IS_OVERLAY_ACTIVE(fh) != 0) {
+                saa7146_stop_preview(fh);
+                saa7146_start_preview(fh);
+        }
+        return 0;
+}
+
+static int vidioc_g_parm(struct file *file, void *fh,
+                struct v4l2_streamparm *parm)
+{
+        struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
+        struct saa7146_vv *vv = dev->vv_data;
+
+        parm->parm.capture.readbuffers = 1;
+        v4l2_video_std_frame_period(vv->standard->id,
+                                    &parm->parm.capture.timeperframe);
+        return 0;
+}
+
+static int vidioc_g_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *f)
+{
+        f->fmt.pix = ((struct saa7146_fh *)fh)->video_fmt;
+        return 0;
+}
+
+static int vidioc_g_fmt_vid_overlay(struct file *file, void *fh, struct v4l2_format *f)
+{
+        f->fmt.win = ((struct saa7146_fh *)fh)->ov.win;
+        return 0;
+}
+
+static int vidioc_g_fmt_vbi_cap(struct file *file, void *fh, struct v4l2_format *f)
+{
+        f->fmt.vbi = ((struct saa7146_fh *)fh)->vbi_fmt;
+        return 0;
+}
+
+static int vidioc_try_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *f)
+{
+        struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
+        struct saa7146_vv *vv = dev->vv_data;
+        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 = saa7146_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;
+}
+
+
+static int vidioc_try_fmt_vid_overlay(struct file *file, void *fh, struct v4l2_format *f)
+{
+        struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
+        struct saa7146_vv *vv = dev->vv_data;
+        struct v4l2_window *win = &f->fmt.win;
+        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 vidioc_s_fmt_vid_cap(struct file *file, void *__fh, struct v4l2_format *f)
+{
+        struct saa7146_fh *fh = __fh;
+        struct saa7146_dev *dev = fh->dev;
+        struct saa7146_vv *vv = dev->vv_data;
+        int err;
+
+        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 = vidioc_try_fmt_vid_cap(file, 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;
+}
+
+static int vidioc_s_fmt_vid_overlay(struct file *file, void *__fh, struct v4l2_format *f)
+{
+        struct saa7146_fh *fh = __fh;
+        struct saa7146_dev *dev = fh->dev;
+        struct saa7146_vv *vv = dev->vv_data;
+        int err;
+
+        DEB_EE(("V4L2_BUF_TYPE_VIDEO_OVERLAY: dev:%p, fh:%p\n", dev, fh));
+        err = vidioc_try_fmt_vid_overlay(file, fh, f);
+        if (0 != err)
+                return err;
+        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)) {
+                return -EFAULT;
+        }
+
+        /* fh->ov.fh is used to indicate that we have valid overlay informations, too */
+        fh->ov.fh = fh;
+
+        /* check if our current overlay is active */
+        if (IS_OVERLAY_ACTIVE(fh) != 0) {
+                saa7146_stop_preview(fh);
+                saa7146_start_preview(fh);
+        }
+        return 0;
+}
+
+static int vidioc_g_std(struct file *file, void *fh, v4l2_std_id *norm)
+{
+        struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
+        struct saa7146_vv *vv = dev->vv_data;
+
+        *norm = 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;
+        }
+        */
+
+static int vidioc_s_std(struct file *file, void *fh, v4l2_std_id *id)
+{
+        struct saa7146_dev *dev = ((struct saa7146_fh *)fh)->dev;
+        struct saa7146_vv *vv = dev->vv_data;
+        int found = 0;
+        int err, i;
+
+        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;
+                }
+        }
+
+        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;
+        }
+
+        if (vv->ov_suspend != NULL) {
+                saa7146_start_preview(vv->ov_suspend);
+                vv->ov_suspend = NULL;
+        }
+
+        if (!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;
+}
+
+static int vidioc_overlay(struct file *file, void *fh, unsigned int on)
+{
+        int err;
+
+        DEB_D(("VIDIOC_OVERLAY on:%d\n", on));
+        if (on)
+                err = saa7146_start_preview(fh);
+        else
+                err = saa7146_stop_preview(fh);
+        return err;
+}
+
+static int vidioc_reqbufs(struct file *file, void *__fh, struct v4l2_requestbuffers *b)
+{
+        struct saa7146_fh *fh = __fh;
+
+        if (b->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+                return videobuf_reqbufs(&fh->video_q, b);
+        if (b->type == V4L2_BUF_TYPE_VBI_CAPTURE)
+                return videobuf_reqbufs(&fh->vbi_q, b);
+        return -EINVAL;
+}
+
+static int vidioc_querybuf(struct file *file, void *__fh, struct v4l2_buffer *buf)
+{
+        struct saa7146_fh *fh = __fh;
+
+        if (buf->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+                return videobuf_querybuf(&fh->video_q, buf);
+        if (buf->type == V4L2_BUF_TYPE_VBI_CAPTURE)
+                return videobuf_querybuf(&fh->vbi_q, buf);
+        return -EINVAL;
+}
+
+static int vidioc_qbuf(struct file *file, void *__fh, struct v4l2_buffer *buf)
+{
+        struct saa7146_fh *fh = __fh;
+
+        if (buf->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+                return videobuf_qbuf(&fh->video_q, buf);
+        if (buf->type == V4L2_BUF_TYPE_VBI_CAPTURE)
+                return videobuf_qbuf(&fh->vbi_q, buf);
+        return -EINVAL;
+}
+
+static int vidioc_dqbuf(struct file *file, void *__fh, struct v4l2_buffer *buf)
+{
+        struct saa7146_fh *fh = __fh;
+
+        if (buf->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+                return videobuf_dqbuf(&fh->video_q, buf, file->f_flags & O_NONBLOCK);
+        if (buf->type == V4L2_BUF_TYPE_VBI_CAPTURE)
+                return videobuf_dqbuf(&fh->vbi_q, buf, file->f_flags & O_NONBLOCK);
+        return -EINVAL;
+}
+
+static int vidioc_streamon(struct file *file, void *__fh, enum v4l2_buf_type type)
+{
+        struct saa7146_fh *fh = __fh;
+        int err;
+
+        DEB_D(("VIDIOC_STREAMON, type:%d\n", type));
+
+        err = video_begin(fh);
+        if (err)
+                return err;
+        if (type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+                return videobuf_streamon(&fh->video_q);
+        if (type == V4L2_BUF_TYPE_VBI_CAPTURE)
+                return videobuf_streamon(&fh->vbi_q);
+        return -EINVAL;
+}
+
+static int vidioc_streamoff(struct file *file, void *__fh, enum v4l2_buf_type type)
+{
+        struct saa7146_fh *fh = __fh;
+        struct saa7146_dev *dev = fh->dev;
+        struct saa7146_vv *vv = dev->vv_data;
+        int err;
+
+        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 = -EINVAL;
+        if (type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+                err = videobuf_streamoff(&fh->video_q);
+        else if (type == V4L2_BUF_TYPE_VBI_CAPTURE)
+                err = videobuf_streamoff(&fh->vbi_q);
+        if (0 != err) {
+                DEB_D(("warning: videobuf_streamoff() failed.\n"));
+                video_end(fh, file);
+        } else {
+                err = video_end(fh, file);
+        }
+        return err;
+}
+
+static int vidioc_g_chip_ident(struct file *file, void *__fh,
+                struct v4l2_dbg_chip_ident *chip)
+{
+        struct saa7146_fh *fh = __fh;
+        struct saa7146_dev *dev = fh->dev;
+
+        chip->ident = V4L2_IDENT_NONE;
+        chip->revision = 0;
+        if (chip->match.type == V4L2_CHIP_MATCH_HOST && !chip->match.addr) {
+                chip->ident = V4L2_IDENT_SAA7146;
+                return 0;
+        }
+        return v4l2_device_call_until_err(&dev->v4l2_dev, 0,
+                        core, g_chip_ident, chip);
+}
+
+const struct v4l2_ioctl_ops saa7146_video_ioctl_ops = {
+        .vidioc_querycap             = vidioc_querycap,
+        .vidioc_enum_fmt_vid_cap     = vidioc_enum_fmt_vid_cap,
+        .vidioc_enum_fmt_vid_overlay = vidioc_enum_fmt_vid_cap,
+        .vidioc_g_fmt_vid_cap        = vidioc_g_fmt_vid_cap,
+        .vidioc_try_fmt_vid_cap      = vidioc_try_fmt_vid_cap,
+        .vidioc_s_fmt_vid_cap        = vidioc_s_fmt_vid_cap,
+        .vidioc_g_fmt_vid_overlay    = vidioc_g_fmt_vid_overlay,
+        .vidioc_try_fmt_vid_overlay  = vidioc_try_fmt_vid_overlay,
+        .vidioc_s_fmt_vid_overlay    = vidioc_s_fmt_vid_overlay,
+        .vidioc_g_fmt_vbi_cap        = vidioc_g_fmt_vbi_cap,
+        .vidioc_g_chip_ident         = vidioc_g_chip_ident,
+
+        .vidioc_overlay              = vidioc_overlay,
+        .vidioc_g_fbuf               = vidioc_g_fbuf,
+        .vidioc_s_fbuf               = vidioc_s_fbuf,
+        .vidioc_reqbufs              = vidioc_reqbufs,
+        .vidioc_querybuf             = vidioc_querybuf,
+        .vidioc_qbuf                 = vidioc_qbuf,
+        .vidioc_dqbuf                = vidioc_dqbuf,
+        .vidioc_g_std                = vidioc_g_std,
+        .vidioc_s_std                = vidioc_s_std,
+        .vidioc_queryctrl            = vidioc_queryctrl,
+        .vidioc_g_ctrl               = vidioc_g_ctrl,
+        .vidioc_s_ctrl               = vidioc_s_ctrl,
+        .vidioc_streamon             = vidioc_streamon,
+        .vidioc_streamoff            = vidioc_streamoff,
+        .vidioc_g_parm               = vidioc_g_parm,
+};
+
+/*********************************************************************************/
+/* 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 = VIDEOBUF_ACTIVE;
+        saa7146_set_capture(dev,buf,next);
+
+        mod_timer(&vv->video_q.timeout, jiffies+BUFFER_TIMEOUT);
+        return 0;
+}
+
+static void release_all_pagetables(struct saa7146_dev *dev, struct saa7146_buf *buf)
+{
+        saa7146_pgtable_free(dev->pci, &buf->pt[0]);
+        saa7146_pgtable_free(dev->pci, &buf->pt[1]);
+        saa7146_pgtable_free(dev->pci, &buf->pt[2]);
+}
+
+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 (VIDEOBUF_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 = saa7146_format_by_fourcc(dev,buf->fmt->pixelformat);
+
+                release_all_pagetables(dev, buf);
+                if( 0 != IS_PLANAR(sfmt->trans)) {
+                        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_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 = VIDEOBUF_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);
+
+        release_all_pagetables(dev, 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 = 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 = saa7146_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_sg_init(&fh->video_q, &video_qops,
+                            &dev->pci->dev, &dev->slock,
+                            V4L2_BUF_TYPE_VIDEO_CAPTURE,
+                            V4L2_FIELD_INTERLACED,
+                            sizeof(struct saa7146_buf),
+                            file, &dev->v4l2_lock);
+
+        return 0;
+}
+
+
+static void video_close(struct saa7146_dev *dev, struct file *file)
+{
+        struct saa7146_fh *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,VIDEOBUF_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,
+};