Linux-2.6.33.2/drivers/media/common/saa7146_video.c
#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* 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 = 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 = 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;
}
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 = 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;
}
}
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;
}
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;
}
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 -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"));
mutex_unlock(&dev->lock);
return -EBUSY;
}
vv->vflip = c->value;
break;
default:
mutex_unlock(&dev->lock);
return -EINVAL;
}
mutex_unlock(&dev->lock);
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 = 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;
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;
}
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;
}
}
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 (!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);
}
#ifdef CONFIG_VIDEO_V4L1_COMPAT
static int vidiocgmbuf(struct file *file, void *__fh, struct video_mbuf *mbuf)
{
struct saa7146_fh *fh = __fh;
struct videobuf_queue *q = &fh->video_q;
int err, 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
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,
#ifdef CONFIG_VIDEO_V4L1_COMPAT
.vidiocgmbuf = vidiocgmbuf,
#endif
};
/*********************************************************************************/
/* 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 = 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 = (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_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);
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,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,
};