iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

V4L/DVB (8103): videodev: fix/improve ioctl debugging

Browse Source 
Various ioctl debugging fixes and improvements:

- use %x rather than %d for control IDs and bitmask fields
- make two arrays const
- show the whole control array for the ext_ctrl ioctls
- print pix_fmt for V4L2_BUF_TYPE_VIDEO_OUTPUT
- show full type name rather than an integer
- fix CROPCAP debugging
- fix G/S_TUNER debugging
- show error code in case of an error
- other small cleanups

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Hans Verkuil 2008-06-22 11:55:09 -03:00 committed by Mauro Carvalho Chehab
parent 7dc1b8844e
commit 21575c1312
2 changed files with 150 additions and 113 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

259
drivers/media/video/videodev.c
View File

@ -17,15 +17,19 @@
*/
#define dbgarg(cmd, fmt, arg...) \
if (vfd->debug & V4L2_DEBUG_IOCTL_ARG) { \
do { \
if (vfd->debug & V4L2_DEBUG_IOCTL_ARG) { \
printk(KERN_DEBUG "%s: ", vfd->name); \
v4l_printk_ioctl(cmd); \
printk(" " fmt, ## arg); \
}
} \
} while (0)
#define dbgarg2(fmt, arg...) \
if (vfd->debug & V4L2_DEBUG_IOCTL_ARG) \
printk(KERN_DEBUG "%s: " fmt, vfd->name, ## arg);
do { \
if (vfd->debug & V4L2_DEBUG_IOCTL_ARG) \
printk(KERN_DEBUG "%s: " fmt, vfd->name, ## arg);\
} while (0)
#include <linux/module.h>
#include <linux/types.h>
@ -138,7 +142,7 @@ EXPORT_SYMBOL(v4l2_video_std_construct);
/* ----------------------------------------------------------------- */
/* some arrays for pretty-printing debug messages of enum types */
char *v4l2_field_names[] = {
const char *v4l2_field_names[] = {
[V4L2_FIELD_ANY] = "any",
[V4L2_FIELD_NONE] = "none",
[V4L2_FIELD_TOP] = "top",
@ -152,19 +156,19 @@ char *v4l2_field_names[] = {
};
EXPORT_SYMBOL(v4l2_field_names);
char *v4l2_type_names[] = {
[V4L2_BUF_TYPE_VIDEO_CAPTURE] = "video-cap",
[V4L2_BUF_TYPE_VIDEO_OVERLAY] = "video-over",
[V4L2_BUF_TYPE_VIDEO_OUTPUT] = "video-out",
const char *v4l2_type_names[] = {
[V4L2_BUF_TYPE_VIDEO_CAPTURE] = "vid-cap",
[V4L2_BUF_TYPE_VIDEO_OVERLAY] = "vid-overlay",
[V4L2_BUF_TYPE_VIDEO_OUTPUT] = "vid-out",
[V4L2_BUF_TYPE_VBI_CAPTURE] = "vbi-cap",
[V4L2_BUF_TYPE_VBI_OUTPUT] = "vbi-out",
[V4L2_BUF_TYPE_SLICED_VBI_CAPTURE] = "sliced-vbi-cap",
[V4L2_BUF_TYPE_SLICED_VBI_OUTPUT] = "sliced-vbi-out",
[V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY] = "video-out-over",
[V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY] = "vid-out-overlay",
};
EXPORT_SYMBOL(v4l2_type_names);
static char *v4l2_memory_names[] = {
static const char *v4l2_memory_names[] = {
[V4L2_MEMORY_MMAP] = "mmap",
[V4L2_MEMORY_USERPTR] = "userptr",
[V4L2_MEMORY_OVERLAY] = "overlay",
@ -660,7 +664,7 @@ static void dbgbuf(unsigned int cmd, struct video_device *vfd,
p->field, p->sequence,
prt_names(p->memory, v4l2_memory_names),
p->m.userptr, p->length);
dbgarg2 ("timecode= %02d:%02d:%02d type=%d, "
dbgarg2("timecode=%02d:%02d:%02d type=%d, "
"flags=0x%08d, frames=%d, userbits=0x%08x\n",
tc->hours,tc->minutes,tc->seconds,
tc->type, tc->flags, tc->frames, *(__u32 *) tc->userbits);
@ -669,7 +673,7 @@ static void dbgbuf(unsigned int cmd, struct video_device *vfd,
static inline void dbgrect(struct video_device *vfd, char *s,
struct v4l2_rect *r)
{
dbgarg2 ("%sRect start at %dx%d, size= %dx%d\n", s, r->left, r->top,
dbgarg2("%sRect start at %dx%d, size=%dx%d\n", s, r->left, r->top,
r->width, r->height);
};
@ -687,6 +691,25 @@ static inline void v4l_print_pix_fmt (struct video_device *vfd,
fmt->bytesperline, fmt->sizeimage, fmt->colorspace);
};
static inline void v4l_print_ext_ctrls(unsigned int cmd,
struct video_device *vfd, struct v4l2_ext_controls *c, int show_vals)
{
__u32 i;
if (!(vfd->debug & V4L2_DEBUG_IOCTL_ARG))
return;
dbgarg(cmd, "");
printk(KERN_CONT "class=0x%x", c->ctrl_class);
for (i = 0; i < c->count; i++) {
if (show_vals)
printk(KERN_CONT " id/val=0x%x/0x%x",
c->controls[i].id, c->controls[i].value);
else
printk(KERN_CONT " id=0x%x", c->controls[i].id);
}
printk(KERN_CONT "\n");
};
static int check_fmt (struct video_device *vfd, enum v4l2_buf_type type)
{
@ -894,7 +917,7 @@ static int __video_do_ioctl(struct inode *inode, struct file *file,
if (vfd->vidioc_g_fmt_vid_cap)
ret = vfd->vidioc_g_fmt_vid_cap(file, fh, f);
if (!ret)
v4l_print_pix_fmt(vfd,&f->fmt.pix);
v4l_print_pix_fmt(vfd, &f->fmt.pix);
break;
case V4L2_BUF_TYPE_VIDEO_OVERLAY:
if (vfd->vidioc_g_fmt_vid_overlay)
@ -904,6 +927,8 @@ static int __video_do_ioctl(struct inode *inode, struct file *file,
case V4L2_BUF_TYPE_VIDEO_OUTPUT:
if (vfd->vidioc_g_fmt_vid_out)
ret = vfd->vidioc_g_fmt_vid_out(file, fh, f);
if (!ret)
v4l_print_pix_fmt(vfd, &f->fmt.pix);
break;
case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
if (vfd->vidioc_g_fmt_vid_out_overlay)
@ -942,12 +967,11 @@ static int __video_do_ioctl(struct inode *inode, struct file *file,
struct v4l2_format *f = (struct v4l2_format *)arg;
/* FIXME: Should be one dump per type */
dbgarg (cmd, "type=%s\n", prt_names(f->type,
v4l2_type_names));
dbgarg(cmd, "type=%s\n", prt_names(f->type, v4l2_type_names));
switch (f->type) {
case V4L2_BUF_TYPE_VIDEO_CAPTURE:
v4l_print_pix_fmt(vfd,&f->fmt.pix);
v4l_print_pix_fmt(vfd, &f->fmt.pix);
if (vfd->vidioc_s_fmt_vid_cap)
ret = vfd->vidioc_s_fmt_vid_cap(file, fh, f);
break;
@ -957,6 +981,7 @@ static int __video_do_ioctl(struct inode *inode, struct file *file,
fh, f);
break;
case V4L2_BUF_TYPE_VIDEO_OUTPUT:
v4l_print_pix_fmt(vfd, &f->fmt.pix);
if (vfd->vidioc_s_fmt_vid_out)
ret = vfd->vidioc_s_fmt_vid_out(file, fh, f);
break;
@ -1003,7 +1028,7 @@ static int __video_do_ioctl(struct inode *inode, struct file *file,
if (vfd->vidioc_try_fmt_vid_cap)
ret = vfd->vidioc_try_fmt_vid_cap(file, fh, f);
if (!ret)
v4l_print_pix_fmt(vfd,&f->fmt.pix);
v4l_print_pix_fmt(vfd, &f->fmt.pix);
break;
case V4L2_BUF_TYPE_VIDEO_OVERLAY:
if (vfd->vidioc_try_fmt_vid_overlay)
@ -1013,6 +1038,8 @@ static int __video_do_ioctl(struct inode *inode, struct file *file,
case V4L2_BUF_TYPE_VIDEO_OUTPUT:
if (vfd->vidioc_try_fmt_vid_out)
ret = vfd->vidioc_try_fmt_vid_out(file, fh, f);
if (!ret)
v4l_print_pix_fmt(vfd, &f->fmt.pix);
break;
case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
if (vfd->vidioc_try_fmt_vid_out_overlay)
@ -1123,29 +1150,29 @@ static int __video_do_ioctl(struct inode *inode, struct file *file,
}
case VIDIOC_G_FBUF:
{
struct v4l2_framebuffer *p=arg;
struct v4l2_framebuffer *p = arg;
if (!vfd->vidioc_g_fbuf)
break;
ret=vfd->vidioc_g_fbuf(file, fh, arg);
ret = vfd->vidioc_g_fbuf(file, fh, arg);
if (!ret) {
dbgarg (cmd, "capability=%d, flags=%d, base=0x%08lx\n",
p->capability,p->flags,
dbgarg(cmd, "capability=0x%x, flags=%d, base=0x%08lx\n",
p->capability, p->flags,
(unsigned long)p->base);
v4l_print_pix_fmt (vfd, &p->fmt);
v4l_print_pix_fmt(vfd, &p->fmt);
}
break;
}
case VIDIOC_S_FBUF:
{
struct v4l2_framebuffer *p=arg;
struct v4l2_framebuffer *p = arg;
if (!vfd->vidioc_s_fbuf)
break;
dbgarg (cmd, "capability=%d, flags=%d, base=0x%08lx\n",
p->capability,p->flags,(unsigned long)p->base);
v4l_print_pix_fmt (vfd, &p->fmt);
ret=vfd->vidioc_s_fbuf(file, fh, arg);
dbgarg(cmd, "capability=0x%x, flags=%d, base=0x%08lx\n",
p->capability, p->flags, (unsigned long)p->base);
v4l_print_pix_fmt(vfd, &p->fmt);
ret = vfd->vidioc_s_fbuf(file, fh, arg);
break;
}
case VIDIOC_STREAMON:
@ -1197,7 +1224,7 @@ static int __video_do_ioctl(struct inode *inode, struct file *file,
v4l2_video_std_construct(p, curr_id, descr);
p->index = index;
dbgarg(cmd, "index=%d, id=%Ld, name=%s, fps=%d/%d, "
dbgarg(cmd, "index=%d, id=0x%Lx, name=%s, fps=%d/%d, "
"framelines=%d\n", p->index,
(unsigned long long)p->id, p->name,
p->frameperiod.numerator,
@ -1219,14 +1246,14 @@ static int __video_do_ioctl(struct inode *inode, struct file *file,
*id = vfd->current_norm;
if (!ret)
dbgarg(cmd, "value=%08Lx\n", (long long unsigned)*id);
dbgarg(cmd, "std=0x%08Lx\n", (long long unsigned)*id);
break;
}
case VIDIOC_S_STD:
{
v4l2_std_id *id = arg,norm;
dbgarg (cmd, "value=%08Lx\n", (long long unsigned) *id);
dbgarg(cmd, "std=%08Lx\n", (long long unsigned)*id);
norm = (*id) & vfd->tvnorms;
if ( vfd->tvnorms && !norm) /* Check if std is supported */
@ -1315,8 +1342,8 @@ static int __video_do_ioctl(struct inode *inode, struct file *file,
ret = vfd->vidioc_enum_output(file, fh, p);
if (!ret)
dbgarg(cmd, "index=%d, name=%s, type=%d, "
"audioset=%d, "
"modulator=%d, std=%08Lx\n",
"audioset=0x%x, "
"modulator=%d, std=0x%08Lx\n",
p->index, p->name, p->type, p->audioset,
p->modulator, (unsigned long long)p->std);
break;
@ -1346,19 +1373,19 @@ static int __video_do_ioctl(struct inode *inode, struct file *file,
/* --- controls ---------------------------------------------- */
case VIDIOC_QUERYCTRL:
{
struct v4l2_queryctrl *p=arg;
struct v4l2_queryctrl *p = arg;
if (!vfd->vidioc_queryctrl)
break;
ret=vfd->vidioc_queryctrl(file, fh, p);
ret = vfd->vidioc_queryctrl(file, fh, p);
if (!ret)
dbgarg (cmd, "id=%d, type=%d, name=%s, "
"min/max=%d/%d,"
" step=%d, default=%d, flags=0x%08x\n",
p->id,p->type,p->name,p->minimum,
p->maximum,p->step,p->default_value,
p->flags);
dbgarg(cmd, "id=0x%x, type=%d, name=%s, min/max=%d/%d, "
"step=%d, default=%d, flags=0x%08x\n",
p->id, p->type, p->name,
p->minimum, p->maximum,
p->step, p->default_value, p->flags);
else
dbgarg(cmd, "id=0x%x\n", p->id);
break;
}
case VIDIOC_G_CTRL:
@ -1367,11 +1394,12 @@ static int __video_do_ioctl(struct inode *inode, struct file *file,
if (!vfd->vidioc_g_ctrl)
break;
dbgarg(cmd, "Enum for index=%d\n", p->id);
ret=vfd->vidioc_g_ctrl(file, fh, p);
ret = vfd->vidioc_g_ctrl(file, fh, p);
if (!ret)
dbgarg2 ( "id=%d, value=%d\n", p->id, p->value);
dbgarg(cmd, "id=0x%x, value=%d\n", p->id, p->value);
else
dbgarg(cmd, "id=0x%x\n", p->id);
break;
}
case VIDIOC_S_CTRL:
@ -1380,20 +1408,19 @@ static int __video_do_ioctl(struct inode *inode, struct file *file,
if (!vfd->vidioc_s_ctrl)
break;
dbgarg (cmd, "id=%d, value=%d\n", p->id, p->value);
dbgarg(cmd, "id=0x%x, value=%d\n", p->id, p->value);
ret=vfd->vidioc_s_ctrl(file, fh, p);
ret = vfd->vidioc_s_ctrl(file, fh, p);
break;
}
case VIDIOC_G_EXT_CTRLS:
{
struct v4l2_ext_controls *p = arg;
if (vfd->vidioc_g_ext_ctrls) {
dbgarg(cmd, "count=%d\n", p->count);
ret=vfd->vidioc_g_ext_ctrls(file, fh, p);
}
if (!vfd->vidioc_g_ext_ctrls)
break;
ret = vfd->vidioc_g_ext_ctrls(file, fh, p);
v4l_print_ext_ctrls(cmd, vfd, p, !ret);
break;
}
case VIDIOC_S_EXT_CTRLS:
@ -1401,9 +1428,9 @@ static int __video_do_ioctl(struct inode *inode, struct file *file,
struct v4l2_ext_controls *p = arg;
if (vfd->vidioc_s_ext_ctrls) {
dbgarg(cmd, "count=%d\n", p->count);
v4l_print_ext_ctrls(cmd, vfd, p, 1);
ret=vfd->vidioc_s_ext_ctrls(file, fh, p);
ret = vfd->vidioc_s_ext_ctrls(file, fh, p);
}
break;
}
@ -1412,66 +1439,72 @@ static int __video_do_ioctl(struct inode *inode, struct file *file,
struct v4l2_ext_controls *p = arg;
if (vfd->vidioc_try_ext_ctrls) {
dbgarg(cmd, "count=%d\n", p->count);
v4l_print_ext_ctrls(cmd, vfd, p, 1);
ret=vfd->vidioc_try_ext_ctrls(file, fh, p);
ret = vfd->vidioc_try_ext_ctrls(file, fh, p);
}
break;
}
case VIDIOC_QUERYMENU:
{
struct v4l2_querymenu *p=arg;
struct v4l2_querymenu *p = arg;
if (!vfd->vidioc_querymenu)
break;
ret=vfd->vidioc_querymenu(file, fh, p);
ret = vfd->vidioc_querymenu(file, fh, p);
if (!ret)
dbgarg (cmd, "id=%d, index=%d, name=%s\n",
p->id,p->index,p->name);
dbgarg(cmd, "id=0x%x, index=%d, name=%s\n",
p->id, p->index, p->name);
else
dbgarg(cmd, "id=0x%x, index=%d\n",
p->id, p->index);
break;
}
/* --- audio ---------------------------------------------- */
case VIDIOC_ENUMAUDIO:
{
struct v4l2_audio *p=arg;
struct v4l2_audio *p = arg;
if (!vfd->vidioc_enumaudio)
break;
dbgarg(cmd, "Enum for index=%d\n", p->index);
ret=vfd->vidioc_enumaudio(file, fh, p);
ret = vfd->vidioc_enumaudio(file, fh, p);
if (!ret)
dbgarg2("index=%d, name=%s, capability=%d, "
"mode=%d\n",p->index,p->name,
dbgarg(cmd, "index=%d, name=%s, capability=0x%x, "
"mode=0x%x\n", p->index, p->name,
p->capability, p->mode);
else
dbgarg(cmd, "index=%d\n", p->index);
break;
}
case VIDIOC_G_AUDIO:
{
struct v4l2_audio *p=arg;
__u32 index=p->index;
struct v4l2_audio *p = arg;
__u32 index = p->index;
if (!vfd->vidioc_g_audio)
break;
memset(p,0,sizeof(*p));
p->index=index;
dbgarg(cmd, "Get for index=%d\n", p->index);
ret=vfd->vidioc_g_audio(file, fh, p);
memset(p, 0, sizeof(*p));
p->index = index;
ret = vfd->vidioc_g_audio(file, fh, p);
if (!ret)
dbgarg2("index=%d, name=%s, capability=%d, "
"mode=%d\n",p->index,
p->name,p->capability, p->mode);
dbgarg(cmd, "index=%d, name=%s, capability=0x%x, "
"mode=0x%x\n", p->index,
p->name, p->capability, p->mode);
else
dbgarg(cmd, "index=%d\n", p->index);
break;
}
case VIDIOC_S_AUDIO:
{
struct v4l2_audio *p=arg;
struct v4l2_audio *p = arg;
if (!vfd->vidioc_s_audio)
break;
dbgarg(cmd, "index=%d, name=%s, capability=%d, "
"mode=%d\n", p->index, p->name,
dbgarg(cmd, "index=%d, name=%s, capability=0x%x, "
"mode=0x%x\n", p->index, p->name,
p->capability, p->mode);
ret=vfd->vidioc_s_audio(file, fh, p);
ret = vfd->vidioc_s_audio(file, fh, p);
break;
}
case VIDIOC_ENUMAUDOUT:
@ -1547,9 +1580,9 @@ static int __video_do_ioctl(struct inode *inode, struct file *file,
struct v4l2_crop *p=arg;
if (!vfd->vidioc_g_crop)
break;
dbgarg(cmd, "type=%s\n", prt_names(p->type, v4l2_type_names));
ret=vfd->vidioc_g_crop(file, fh, p);
if (!ret) {
dbgarg(cmd, "type=%d\n", p->type);
dbgrect(vfd, "", &p->c);
}
break;
@ -1559,21 +1592,24 @@ static int __video_do_ioctl(struct inode *inode, struct file *file,
struct v4l2_crop *p=arg;
if (!vfd->vidioc_s_crop)
break;
dbgarg(cmd, "type=%d\n", p->type);
dbgarg(cmd, "type=%s\n", prt_names(p->type, v4l2_type_names));
dbgrect(vfd, "", &p->c);
ret=vfd->vidioc_s_crop(file, fh, p);
break;
}
case VIDIOC_CROPCAP:
{
struct v4l2_cropcap *p=arg;
struct v4l2_cropcap *p = arg;
/*FIXME: Should also show v4l2_fract pixelaspect */
if (!vfd->vidioc_cropcap)
break;
dbgarg(cmd, "type=%d\n", p->type);
dbgrect(vfd, "bounds ", &p->bounds);
dbgrect(vfd, "defrect ", &p->defrect);
ret=vfd->vidioc_cropcap(file, fh, p);
dbgarg(cmd, "type=%s\n", prt_names(p->type, v4l2_type_names));
ret = vfd->vidioc_cropcap(file, fh, p);
if (!ret) {
dbgrect(vfd, "bounds ", &p->bounds);
dbgrect(vfd, "defrect ", &p->defrect);
}
break;
}
case VIDIOC_G_JPEGCOMP:
@ -1675,40 +1711,42 @@ static int __video_do_ioctl(struct inode *inode, struct file *file,
}
case VIDIOC_G_TUNER:
{
struct v4l2_tuner *p=arg;
__u32 index=p->index;
struct v4l2_tuner *p = arg;
__u32 index = p->index;
if (!vfd->vidioc_g_tuner)
break;
memset(p,0,sizeof(*p));
p->index=index;
memset(p, 0, sizeof(*p));
p->index = index;
ret=vfd->vidioc_g_tuner(file, fh, p);
ret = vfd->vidioc_g_tuner(file, fh, p);
if (!ret)
dbgarg (cmd, "index=%d, name=%s, type=%d, "
"capability=%d, rangelow=%d, "
dbgarg(cmd, "index=%d, name=%s, type=%d, "
"capability=0x%x, rangelow=%d, "
"rangehigh=%d, signal=%d, afc=%d, "
"rxsubchans=%d, audmode=%d\n",
"rxsubchans=0x%x, audmode=%d\n",
p->index, p->name, p->type,
p->capability, p->rangelow,
p->rangehigh, p->rxsubchans,
p->audmode, p->signal, p->afc);
p->rangehigh, p->signal, p->afc,
p->rxsubchans, p->audmode);
break;
}
case VIDIOC_S_TUNER:
{
struct v4l2_tuner *p=arg;
struct v4l2_tuner *p = arg;
if (!vfd->vidioc_s_tuner)
break;
dbgarg (cmd, "index=%d, name=%s, type=%d, "
"capability=%d, rangelow=%d, rangehigh=%d, "
"signal=%d, afc=%d, rxsubchans=%d, "
"audmode=%d\n",p->index, p->name, p->type,
p->capability, p->rangelow,p->rangehigh,
p->rxsubchans, p->audmode, p->signal,
p->afc);
ret=vfd->vidioc_s_tuner(file, fh, p);
dbgarg(cmd, "index=%d, name=%s, type=%d, "
"capability=0x%x, rangelow=%d, "
"rangehigh=%d, signal=%d, afc=%d, "
"rxsubchans=0x%x, audmode=%d\n",
p->index, p->name, p->type,
p->capability, p->rangelow,
p->rangehigh, p->signal, p->afc,
p->rxsubchans, p->audmode);
ret = vfd->vidioc_s_tuner(file, fh, p);
break;
}
case VIDIOC_G_FREQUENCY:
@ -1745,10 +1783,10 @@ static int __video_do_ioctl(struct inode *inode, struct file *file,
break;
memset(p, 0, sizeof(*p));
p->type = type;
dbgarg(cmd, "type=%s\n", prt_names(p->type, v4l2_type_names));
ret = vfd->vidioc_g_sliced_vbi_cap(file, fh, p);
if (!ret)
dbgarg(cmd, "type=%d, service_set=%d\n",
p->type, p->service_set);
dbgarg2("service_set=%d\n", p->service_set);
break;
}
case VIDIOC_LOG_STATUS:
@ -1809,10 +1847,9 @@ static int __video_do_ioctl(struct inode *inode, struct file *file,
} /* switch */
if (vfd->debug & V4L2_DEBUG_IOCTL_ARG) {
if (ret<0) {
printk("%s: err: on ", vfd->name);
if (ret < 0) {
v4l_print_ioctl(vfd->name, cmd);
printk("\n");
printk(KERN_CONT " error %d\n", ret);
}
}

4
include/media/v4l2-dev.h
View File

@ -59,8 +59,8 @@ enum v4l2_priority v4l2_prio_max(struct v4l2_prio_state *global);
int v4l2_prio_check(struct v4l2_prio_state *global, enum v4l2_priority *local);
/* names for fancy debug output */
extern char *v4l2_field_names[];
extern char *v4l2_type_names[];
extern const char *v4l2_field_names[];
extern const char *v4l2_type_names[];
/* Compatibility layer interface -- v4l1-compat module */
typedef int (*v4l2_kioctl)(struct inode *inode, struct file *file,