提交 c820cc45 编写于 作者: M Mauro Carvalho Chehab

V4L/DVB (4066): Vivi.c were ported to the newer videodev2 format.

Several common handling codes were removed. Maybe even more
stuff may be handled at common infrastructure.
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>
上级 401998fa
......@@ -48,24 +48,15 @@
#include "font.h"
MODULE_DESCRIPTION("Video Technology Magazine Virtual Video Capture Board");
MODULE_AUTHOR("Mauro Carvalho Chehab, Ted Walther and John Sokol");
MODULE_LICENSE("Dual BSD/GPL");
#define VIVI_MAJOR_VERSION 0
#define VIVI_MINOR_VERSION 4
#define VIVI_RELEASE 0
#define VIVI_VERSION KERNEL_VERSION(VIVI_MAJOR_VERSION, VIVI_MINOR_VERSION, VIVI_RELEASE)
static int video_nr = -1; /* /dev/videoN, -1 for autodetect */
module_param(video_nr, int, 0);
static int debug = 0;
module_param(debug, int, 0);
static unsigned int vid_limit = 16;
module_param(vid_limit,int,0644);
MODULE_PARM_DESC(vid_limit,"capture memory limit in megabytes");
/* Declare static vars that will be used as parameters */
static unsigned int vid_limit = 16; /* Video memory limit, in Mb */
static struct video_device vivi; /* Video device */
static int video_nr = -1; /* /dev/videoN, -1 for autodetect */
/* supported controls */
static struct v4l2_queryctrl vivi_qctrl[] = {
......@@ -119,10 +110,10 @@ static struct v4l2_queryctrl vivi_qctrl[] = {
static int qctl_regs[ARRAY_SIZE(vivi_qctrl)];
#define dprintk(level,fmt, arg...) \
do { \
if (debug >= (level)) \
printk(KERN_DEBUG "vivi: " fmt , ## arg); \
#define dprintk(level,fmt, arg...) \
do { \
if (vivi.debug >= (level)) \
printk(KERN_DEBUG "vivi: " fmt , ## arg); \
} while (0)
/* ------------------------------------------------------------------
......@@ -180,7 +171,7 @@ struct vivi_dev {
/* various device info */
unsigned int resources;
struct video_device video_dev;
struct video_device vfd;
struct vivi_dmaqueue vidq;
......@@ -830,7 +821,80 @@ static struct videobuf_queue_ops vivi_video_qops = {
IOCTL handling
------------------------------------------------------------------*/
static int vivi_try_fmt(struct vivi_dev *dev, struct vivi_fh *fh,
static int res_get(struct vivi_dev *dev, struct vivi_fh *fh)
{
/* is it free? */
down(&dev->lock);
if (dev->resources) {
/* no, someone else uses it */
up(&dev->lock);
return 0;
}
/* it's free, grab it */
dev->resources =1;
dprintk(1,"res: get\n");
up(&dev->lock);
return 1;
}
static int res_locked(struct vivi_dev *dev)
{
return (dev->resources);
}
static void res_free(struct vivi_dev *dev, struct vivi_fh *fh)
{
down(&dev->lock);
dev->resources = 0;
dprintk(1,"res: put\n");
up(&dev->lock);
}
/* ------------------------------------------------------------------
IOCTL vidioc handling
------------------------------------------------------------------*/
static int vidioc_querycap (struct file *file, void *priv,
struct v4l2_capability *cap)
{
strcpy(cap->driver, "vivi");
strcpy(cap->card, "vivi");
cap->version = VIVI_VERSION;
cap->capabilities = V4L2_CAP_VIDEO_CAPTURE |
V4L2_CAP_STREAMING |
V4L2_CAP_READWRITE;
return 0;
}
static int vidioc_enum_fmt_cap (struct file *file, void *priv,
struct v4l2_fmtdesc *f)
{
if (f->index > 0)
return -EINVAL;
strlcpy(f->description,format.name,sizeof(f->description));
f->pixelformat = format.fourcc;
return 0;
}
static int vidioc_g_fmt_cap (struct file *file, void *priv,
struct v4l2_format *f)
{
struct vivi_fh *fh=priv;
f->fmt.pix.width = fh->width;
f->fmt.pix.height = fh->height;
f->fmt.pix.field = fh->vb_vidq.field;
f->fmt.pix.pixelformat = fh->fmt->fourcc;
f->fmt.pix.bytesperline =
(f->fmt.pix.width * fh->fmt->depth) >> 3;
f->fmt.pix.sizeimage =
f->fmt.pix.height * f->fmt.pix.bytesperline;
return (0);
}
static int vidioc_try_fmt_cap (struct file *file, void *priv,
struct v4l2_format *f)
{
struct vivi_fmt *fmt;
......@@ -838,7 +902,8 @@ static int vivi_try_fmt(struct vivi_dev *dev, struct vivi_fh *fh,
unsigned int maxw, maxh;
if (format.fourcc != f->fmt.pix.pixelformat) {
dprintk(1,"Fourcc format invalid.\n");
dprintk(1,"Fourcc format (0x%08x) invalid. Driver accepts "
"only 0x%08x\n",f->fmt.pix.pixelformat,format.fourcc);
return -EINVAL;
}
fmt=&format;
......@@ -874,356 +939,196 @@ static int vivi_try_fmt(struct vivi_dev *dev, struct vivi_fh *fh,
return 0;
}
static int res_get(struct vivi_dev *dev, struct vivi_fh *fh)
/*FIXME: This seems to be generic enough to be at videodev2 */
static int vidioc_s_fmt_cap (struct file *file, void *priv,
struct v4l2_format *f)
{
/* is it free? */
down(&dev->lock);
if (dev->resources) {
/* no, someone else uses it */
up(&dev->lock);
return 0;
}
/* it's free, grab it */
dev->resources =1;
dprintk(1,"res: get\n");
up(&dev->lock);
return 1;
struct vivi_fh *fh=priv;
int ret = vidioc_try_fmt_cap(file,fh,f);
if (ret < 0)
return (ret);
fh->fmt = &format;
fh->width = f->fmt.pix.width;
fh->height = f->fmt.pix.height;
fh->vb_vidq.field = f->fmt.pix.field;
fh->type = f->type;
return (0);
}
static int res_locked(struct vivi_dev *dev)
static int vidioc_reqbufs (struct file *file, void *priv, struct v4l2_requestbuffers *p)
{
return (dev->resources);
}
struct vivi_fh *fh=priv;
static void res_free(struct vivi_dev *dev, struct vivi_fh *fh)
{
down(&dev->lock);
dev->resources = 0;
dprintk(1,"res: put\n");
up(&dev->lock);
return (videobuf_reqbufs(&fh->vb_vidq, p));
}
static int vivi_do_ioctl(struct inode *inode, struct file *file, unsigned int cmd, void *arg)
static int vidioc_querybuf (struct file *file, void *priv, struct v4l2_buffer *p)
{
struct vivi_fh *fh = file->private_data;
struct vivi_dev *dev = fh->dev;
int ret=0;
struct vivi_fh *fh=priv;
if (debug) {
if (_IOC_DIR(cmd) & _IOC_WRITE)
v4l_printk_ioctl_arg("vivi(w)",cmd, arg);
else if (!_IOC_DIR(cmd) & _IOC_READ) {
v4l_print_ioctl("vivi", cmd);
}
}
return (videobuf_querybuf(&fh->vb_vidq, p));
}
switch(cmd) {
/* --- capabilities ------------------------------------------ */
case VIDIOC_QUERYCAP:
{
struct v4l2_capability *cap = (struct v4l2_capability*)arg;
memset(cap, 0, sizeof(*cap));
strcpy(cap->driver, "vivi");
strcpy(cap->card, "vivi");
cap->version = VIVI_VERSION;
cap->capabilities =
V4L2_CAP_VIDEO_CAPTURE |
V4L2_CAP_STREAMING |
V4L2_CAP_READWRITE;
break;
}
/* --- capture ioctls ---------------------------------------- */
case VIDIOC_ENUM_FMT:
{
struct v4l2_fmtdesc *f = arg;
enum v4l2_buf_type type;
unsigned int index;
static int vidioc_qbuf (struct file *file, void *priv, struct v4l2_buffer *p)
{
struct vivi_fh *fh=priv;
index = f->index;
type = f->type;
return (videobuf_qbuf(&fh->vb_vidq, p));
}
if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
ret=-EINVAL;
break;
}
static int vidioc_dqbuf (struct file *file, void *priv, struct v4l2_buffer *p)
{
struct vivi_fh *fh=priv;
switch (type) {
case V4L2_BUF_TYPE_VIDEO_CAPTURE:
if (index > 0){
ret=-EINVAL;
break;
}
memset(f,0,sizeof(*f));
return (videobuf_dqbuf(&fh->vb_vidq, p,
file->f_flags & O_NONBLOCK));
}
f->index = index;
f->type = type;
strlcpy(f->description,format.name,sizeof(f->description));
f->pixelformat = format.fourcc;
break;
default:
ret=-EINVAL;
}
break;
#ifdef HAVE_V4L1
static int vidiocgmbuf (struct file *file, void *priv, struct video_mbuf *mbuf)
{
struct vivi_fh *fh=priv;
struct videobuf_queue *q=&fh->vb_vidq;
struct v4l2_requestbuffers req;
unsigned int i, ret;
req.type = q->type;
req.count = 8;
req.memory = V4L2_MEMORY_MMAP;
ret = videobuf_reqbufs(q,&req);
if (ret < 0)
return (ret);
memset(mbuf,0,sizeof(*mbuf));
mbuf->frames = req.count;
mbuf->size = 0;
for (i = 0; i < mbuf->frames; i++) {
mbuf->offsets[i] = q->bufs[i]->boff;
mbuf->size += q->bufs[i]->bsize;
}
case VIDIOC_G_FMT:
{
struct v4l2_format *f = (struct v4l2_format *)arg;
return (0);
}
#endif
if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
ret=-EINVAL;
break;
}
int vidioc_streamon (struct file *file, void *priv, enum v4l2_buf_type i)
{
struct vivi_fh *fh=priv;
struct vivi_dev *dev = fh->dev;
memset(&f->fmt.pix,0,sizeof(f->fmt.pix));
f->fmt.pix.width = fh->width;
f->fmt.pix.height = fh->height;
f->fmt.pix.field = fh->vb_vidq.field;
f->fmt.pix.pixelformat = fh->fmt->fourcc;
f->fmt.pix.bytesperline =
(f->fmt.pix.width * fh->fmt->depth) >> 3;
f->fmt.pix.sizeimage =
f->fmt.pix.height * f->fmt.pix.bytesperline;
break;
}
case VIDIOC_S_FMT:
{
struct v4l2_format *f = arg;
if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
if (i != fh->type)
return -EINVAL;
if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
dprintk(1,"Only capture supported.\n");
ret=-EINVAL;
break;
}
if (!res_get(dev,fh))
return -EBUSY;
return (videobuf_streamon(&fh->vb_vidq));
}
ret = vivi_try_fmt(dev,fh,f);
if (ret < 0)
break;
int vidioc_streamoff (struct file *file, void *priv, enum v4l2_buf_type i)
{
struct vivi_fh *fh=priv;
struct vivi_dev *dev = fh->dev;
fh->fmt = &format;
fh->width = f->fmt.pix.width;
fh->height = f->fmt.pix.height;
fh->vb_vidq.field = f->fmt.pix.field;
fh->type = f->type;
if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
if (i != fh->type)
return -EINVAL;
break;
}
case VIDIOC_TRY_FMT:
{
struct v4l2_format *f = arg;
if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
ret=-EINVAL;
break;
}
videobuf_streamoff(&fh->vb_vidq);
res_free(dev,fh);
ret=vivi_try_fmt(dev,fh,f);
break;
}
case VIDIOC_REQBUFS:
if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
ret=-EINVAL;
break;
}
ret=videobuf_reqbufs(&fh->vb_vidq, arg);
break;
case VIDIOC_QUERYBUF:
if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
ret=-EINVAL;
break;
}
ret=videobuf_querybuf(&fh->vb_vidq, arg);
break;
case VIDIOC_QBUF:
if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
ret=-EINVAL;
break;
}
ret=videobuf_qbuf(&fh->vb_vidq, arg);
break;
case VIDIOC_DQBUF:
if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
ret=-EINVAL;
break;
}
ret=videobuf_dqbuf(&fh->vb_vidq, arg,
file->f_flags & O_NONBLOCK);
break;
#ifdef HAVE_V4L1
/* --- streaming capture ------------------------------------- */
case VIDIOCGMBUF:
{
struct video_mbuf *mbuf = arg;
struct videobuf_queue *q=&fh->vb_vidq;
struct v4l2_requestbuffers req;
unsigned int i;
memset(&req,0,sizeof(req));
req.type = q->type;
req.count = 8;
req.memory = V4L2_MEMORY_MMAP;
ret = videobuf_reqbufs(q,&req);
if (ret < 0)
break;
memset(mbuf,0,sizeof(*mbuf));
mbuf->frames = req.count;
mbuf->size = 0;
for (i = 0; i < mbuf->frames; i++) {
mbuf->offsets[i] = q->bufs[i]->boff;
mbuf->size += q->bufs[i]->bsize;
}
break;
}
#endif
case VIDIOC_STREAMON:
{
if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
if (!res_get(dev,fh))
return -EBUSY;
ret=videobuf_streamon(&fh->vb_vidq);
break;
}
case VIDIOC_STREAMOFF:
return (0);
}
static struct v4l2_tvnorm tvnorms[] = {
{
if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
ret=-EINVAL;
break;
}
ret = videobuf_streamoff(&fh->vb_vidq);
if (ret < 0)
break;
res_free(dev,fh);
break;
.name = "NTSC-M",
.id = V4L2_STD_NTSC_M,
}
/* ---------- tv norms ---------- */
case VIDIOC_ENUMSTD:
{
struct v4l2_standard *e = arg;
};
if (e->index>0) {
ret=-EINVAL;
break;
}
ret = v4l2_video_std_construct(e, V4L2_STD_NTSC_M, "NTSC-M");
static int vidioc_s_std (struct file *file, void *priv, v4l2_std_id a)
{
/* Allows vivi to use different fps from video std */
e->frameperiod.numerator = WAKE_NUMERATOR;
e->frameperiod.denominator = WAKE_DENOMINATOR;
return 0;
}
break;
}
case VIDIOC_G_STD:
{
v4l2_std_id *id = arg;
/* only one input in this sample driver */
static int vidioc_enum_input (struct file *file, void *priv,
struct v4l2_input *inp)
{
if (inp->index != 0)
return -EINVAL;
*id = V4L2_STD_NTSC_M;
break;
}
case VIDIOC_S_STD:
{
break;
}
/* ------ input switching ---------- */
case VIDIOC_ENUMINPUT:
{ /* only one input in this sample driver */
struct v4l2_input *inp = arg;
inp->type = V4L2_INPUT_TYPE_CAMERA;
inp->std = V4L2_STD_NTSC_M;
strcpy(inp->name,"Camera");
if (inp->index != 0) {
ret=-EINVAL;
break;
}
memset(inp, 0, sizeof(*inp));
return (0);
}
inp->index = 0;
inp->type = V4L2_INPUT_TYPE_CAMERA;
inp->std = V4L2_STD_NTSC_M;
strcpy(inp->name,"Camera");
break;
}
case VIDIOC_G_INPUT:
{
unsigned int *i = arg;
static int vidioc_g_input (struct file *file, void *priv, unsigned int *i)
{
*i = 0;
*i = 0;
break;
}
case VIDIOC_S_INPUT:
{
unsigned int *i = arg;
return (0);
}
static int vidioc_s_input (struct file *file, void *priv, unsigned int i)
{
if (i > 0)
return -EINVAL;
if (*i > 0)
ret=-EINVAL;
break;
}
return (0);
}
/* --- controls ---------------------------------------------- */
case VIDIOC_QUERYCTRL:
{
struct v4l2_queryctrl *qc = arg;
int i;
for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
if (qc->id && qc->id == vivi_qctrl[i].id) {
memcpy(qc, &(vivi_qctrl[i]),
sizeof(*qc));
break;
}
static int vidioc_queryctrl (struct file *file, void *priv,
struct v4l2_queryctrl *qc)
{
int i;
ret=-EINVAL;
break;
}
case VIDIOC_G_CTRL:
{
struct v4l2_control *ctrl = arg;
int i;
for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
if (qc->id && qc->id == vivi_qctrl[i].id) {
memcpy(qc, &(vivi_qctrl[i]),
sizeof(*qc));
return (0);
}
for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
if (ctrl->id == vivi_qctrl[i].id) {
ctrl->value=qctl_regs[i];
break;
}
return -EINVAL;
}
ret=-EINVAL;
break;
}
case VIDIOC_S_CTRL:
{
struct v4l2_control *ctrl = arg;
int i;
for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
if (ctrl->id == vivi_qctrl[i].id) {
if (ctrl->value <
vivi_qctrl[i].minimum
|| ctrl->value >
vivi_qctrl[i].maximum) {
ret=-ERANGE;
break;
}
qctl_regs[i]=ctrl->value;
break;
}
ret=-EINVAL;
break;
}
default:
ret=v4l_compat_translate_ioctl(inode,file,cmd,arg,vivi_do_ioctl);
}
static int vidioc_g_ctrl (struct file *file, void *priv,
struct v4l2_control *ctrl)
{
int i;
if (debug) {
if (ret<0) {
v4l_print_ioctl("vivi(err)", cmd);
dprintk(1,"errcode=%d\n",ret);
} else if (_IOC_DIR(cmd) & _IOC_READ)
v4l_printk_ioctl_arg("vivi(r)",cmd, arg);
}
for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
if (ctrl->id == vivi_qctrl[i].id) {
ctrl->value=qctl_regs[i];
return (0);
}
return ret;
return -EINVAL;
}
static int vivi_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
static int vidioc_s_ctrl (struct file *file, void *priv,
struct v4l2_control *ctrl)
{
return video_usercopy(inode, file, cmd, arg, vivi_do_ioctl);
int i;
for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
if (ctrl->id == vivi_qctrl[i].id) {
if (ctrl->value <
vivi_qctrl[i].minimum
|| ctrl->value >
vivi_qctrl[i].maximum) {
return (-ERANGE);
}
qctl_regs[i]=ctrl->value;
return (0);
}
return -EINVAL;
}
/* ------------------------------------------------------------------
......@@ -1245,7 +1150,7 @@ static int vivi_open(struct inode *inode, struct file *file)
list_for_each(list,&vivi_devlist) {
h = list_entry(list, struct vivi_dev, vivi_devlist);
if (h->video_dev.minor == minor) {
if (h->vfd.minor == minor) {
dev = h;
type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
}
......@@ -1254,6 +1159,7 @@ static int vivi_open(struct inode *inode, struct file *file)
return -ENODEV;
/* If more than one user, mutex should be added */
dev->users++;
......@@ -1269,6 +1175,7 @@ static int vivi_open(struct inode *inode, struct file *file)
file->private_data = fh;
fh->dev = dev;
fh->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
fh->fmt = &format;
fh->width = 640;
......@@ -1304,7 +1211,7 @@ static int vivi_open(struct inode *inode, struct file *file)
static ssize_t
vivi_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
{
struct vivi_fh *fh = file->private_data;
struct vivi_fh *fh = file->private_data;
if (fh->type==V4L2_BUF_TYPE_VIDEO_CAPTURE) {
if (res_locked(fh->dev))
......@@ -1318,8 +1225,8 @@ vivi_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
static unsigned int
vivi_poll(struct file *file, struct poll_table_struct *wait)
{
struct vivi_fh *fh = file->private_data;
struct vivi_buffer *buf;
struct vivi_fh *fh = file->private_data;
struct vivi_buffer *buf;
dprintk(1,"%s\n",__FUNCTION__);
......@@ -1348,8 +1255,8 @@ vivi_poll(struct file *file, struct poll_table_struct *wait)
static int vivi_release(struct inode *inode, struct file *file)
{
struct vivi_fh *fh = file->private_data;
struct vivi_dev *dev = fh->dev;
struct vivi_fh *fh = file->private_data;
struct vivi_dev *dev = fh->dev;
struct vivi_dmaqueue *vidq = &dev->vidq;
int minor = iminor(inode);
......@@ -1369,7 +1276,7 @@ static int vivi_release(struct inode *inode, struct file *file)
static int
vivi_mmap(struct file *file, struct vm_area_struct * vma)
{
struct vivi_fh *fh = file->private_data;
struct vivi_fh *fh = file->private_data;
int ret;
dprintk (1,"mmap called, vma=0x%08lx\n",(unsigned long)vma);
......@@ -1390,20 +1297,44 @@ static struct file_operations vivi_fops = {
.release = vivi_release,
.read = vivi_read,
.poll = vivi_poll,
.ioctl = vivi_ioctl,
.ioctl = video_ioctl2, /* V4L2 ioctl handler */
.mmap = vivi_mmap,
.llseek = no_llseek,
};
static struct video_device vivi = {
.name = "VTM Virtual Video Capture Board",
.name = "vivi",
.type = VID_TYPE_CAPTURE,
.hardware = 0,
.fops = &vivi_fops,
.minor = -1,
// .release = video_device_release,
.vidioc_querycap = vidioc_querycap,
.vidioc_enum_fmt_cap = vidioc_enum_fmt_cap,
.vidioc_g_fmt_cap = vidioc_g_fmt_cap,
.vidioc_try_fmt_cap = vidioc_try_fmt_cap,
.vidioc_s_fmt_cap = vidioc_s_fmt_cap,
.vidioc_reqbufs = vidioc_reqbufs,
.vidioc_querybuf = vidioc_querybuf,
.vidioc_qbuf = vidioc_qbuf,
.vidioc_dqbuf = vidioc_dqbuf,
.vidioc_s_std = vidioc_s_std,
.vidioc_enum_input = vidioc_enum_input,
.vidioc_g_input = vidioc_g_input,
.vidioc_s_input = vidioc_s_input,
.vidioc_queryctrl = vidioc_queryctrl,
.vidioc_g_ctrl = vidioc_g_ctrl,
.vidioc_s_ctrl = vidioc_s_ctrl,
.vidioc_streamon = vidioc_streamon,
.vidioc_streamoff = vidioc_streamoff,
#ifdef HAVE_V4L1
.vidiocgmbuf = vidiocgmbuf,
#endif
.tvnorms = tvnorms,
.tvnormsize = ARRAY_SIZE(tvnorms),
};
/* ------------------------------------------------------------------
/* -----------------------------------------------------------------
Initialization and module stuff
------------------------------------------------------------------*/
......@@ -1447,3 +1378,16 @@ static void __exit vivi_exit(void)
module_init(vivi_init);
module_exit(vivi_exit);
MODULE_DESCRIPTION("Video Technology Magazine Virtual Video Capture Board");
MODULE_AUTHOR("Mauro Carvalho Chehab, Ted Walther and John Sokol");
MODULE_LICENSE("Dual BSD/GPL");
module_param(video_nr, int, 0);
module_param_named(debug,vivi.debug, int, 0644);
MODULE_PARM_DESC(debug,"activates debug info");
module_param(vid_limit,int,0644);
MODULE_PARM_DESC(vid_limit,"capture memory limit in megabytes");
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