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V4L/DVB: V4L: Events: Support event handling in do_ioctl 

Add support for event handling to do_ioctl.

Signed-off-by: Sakari Ailus <sakari.ailus@maxwell.research.nokia.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Sakari Ailus 2010-03-27 11:02:10 -03:00 committed by Mauro Carvalho Chehab
parent c3b5b0241f
commit d3d7c96356
3 changed files with 67 additions and 1 deletions
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11
drivers/media/video/v4l2-fh.c
View File

@ -34,7 +34,16 @@ int v4l2_fh_init(struct v4l2_fh *fh, struct video_device *vdev)
INIT_LIST_HEAD(&fh->list);
set_bit(V4L2_FL_USES_V4L2_FH, &fh->vdev->flags);
return v4l2_event_init(fh);
/*
* fh->events only needs to be initialized if the driver
* supports the VIDIOC_SUBSCRIBE_EVENT ioctl.
*/
if (vdev->ioctl_ops && vdev->ioctl_ops->vidioc_subscribe_event)
return v4l2_event_init(fh);
fh->events = NULL;
return 0;
}
EXPORT_SYMBOL_GPL(v4l2_fh_init);

50
drivers/media/video/v4l2-ioctl.c
View File

@ -26,6 +26,8 @@
#endif
#include <media/v4l2-common.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-fh.h>
#include <media/v4l2-event.h>
#include <media/v4l2-chip-ident.h>
#define dbgarg(cmd, fmt, arg...) \
@ -1951,7 +1953,55 @@ static long __video_do_ioctl(struct file *file,
}
break;
}
case VIDIOC_DQEVENT:
{
struct v4l2_event *ev = arg;
if (!ops->vidioc_subscribe_event)
break;
ret = v4l2_event_dequeue(fh, ev, file->f_flags & O_NONBLOCK);
if (ret < 0) {
dbgarg(cmd, "no pending events?");
break;
}
dbgarg(cmd,
"pending=%d, type=0x%8.8x, sequence=%d, "
"timestamp=%lu.%9.9lu ",
ev->pending, ev->type, ev->sequence,
ev->timestamp.tv_sec, ev->timestamp.tv_nsec);
break;
}
case VIDIOC_SUBSCRIBE_EVENT:
{
struct v4l2_event_subscription *sub = arg;
if (!ops->vidioc_subscribe_event)
break;
ret = ops->vidioc_subscribe_event(fh, sub);
if (ret < 0) {
dbgarg(cmd, "failed, ret=%ld", ret);
break;
}
dbgarg(cmd, "type=0x%8.8x", sub->type);
break;
}
case VIDIOC_UNSUBSCRIBE_EVENT:
{
struct v4l2_event_subscription *sub = arg;
if (!ops->vidioc_unsubscribe_event)
break;
ret = ops->vidioc_unsubscribe_event(fh, sub);
if (ret < 0) {
dbgarg(cmd, "failed, ret=%ld", ret);
break;
}
dbgarg(cmd, "type=0x%8.8x", sub->type);
break;
}
default:
{
if (!ops->vidioc_default)

7
include/media/v4l2-ioctl.h
View File

@ -21,6 +21,8 @@
#include <linux/videodev2.h>
#endif
struct v4l2_fh;
struct v4l2_ioctl_ops {
/* ioctl callbacks */
@ -254,6 +256,11 @@ struct v4l2_ioctl_ops {
int (*vidioc_g_dv_timings) (struct file *file, void *fh,
struct v4l2_dv_timings *timings);
int (*vidioc_subscribe_event) (struct v4l2_fh *fh,
struct v4l2_event_subscription *sub);
int (*vidioc_unsubscribe_event)(struct v4l2_fh *fh,
struct v4l2_event_subscription *sub);
/* For other private ioctls */
long (*vidioc_default) (struct file *file, void *fh,
int cmd, void *arg);